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<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Source of the Rust file `/root/.cargo/registry/src/github.com-1ecc6299db9ec823/regex-syntax-0.7.2/src/ast/parse.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>parse.rs - source</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceCodePro-Semibold.ttf.woff2"><link rel="stylesheet" href="../../../normalize.css"><link rel="stylesheet" href="../../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" href="../../../ayu.css" disabled><link rel="stylesheet" href="../../../dark.css" disabled><link rel="stylesheet" href="../../../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../../../storage.js"></script><script defer src="../../../source-script.js"></script><script defer src="../../../source-files.js"></script><script defer src="../../../main.js"></script><noscript><link rel="stylesheet" href="../../../noscript.css"></noscript><link rel="alternate icon" type="image/png" href="../../../favicon-16x16.png"><link rel="alternate icon" type="image/png" href="../../../favicon-32x32.png"><link rel="icon" type="image/svg+xml" href="../../../favicon.svg"></head><body class="rustdoc source"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><a class="sidebar-logo" href="../../../regex_syntax/index.html"><div class="logo-container"><img class="rust-logo" src="../../../rust-logo.svg" alt="logo"></div></a></nav><main><div class="width-limiter"><nav class="sub"><a class="sub-logo-container" href="../../../regex_syntax/index.html"><img class="rust-logo" src="../../../rust-logo.svg" alt="logo"></a><form class="search-form"><div class="search-container"><span></span><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" title="help" tabindex="-1"><a href="../../../help.html">?</a></div><div id="settings-menu" tabindex="-1"><a href="../../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../../wheel.svg"></a></div></div></form></nav><section id="main-content" class="content"><div class="example-wrap"><pre class="src-line-numbers"><span id="1">1</span>
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</pre><pre class="rust"><code><span class="doccomment">/*!
This module provides a regular expression parser.
*/
</span><span class="kw">use </span>core::{
borrow::Borrow,
cell::{Cell, RefCell},
mem,
};
<span class="kw">use </span>alloc::{
boxed::Box,
string::{String, ToString},
vec,
vec::Vec,
};
<span class="kw">use crate</span>::{
ast::{<span class="self">self</span>, Ast, Position, Span},
either::Either,
is_escapeable_character, is_meta_character,
};
<span class="kw">type </span><span class="prelude-ty">Result</span>&lt;T&gt; = core::result::Result&lt;T, ast::Error&gt;;
<span class="doccomment">/// A primitive is an expression with no sub-expressions. This includes
/// literals, assertions and non-set character classes. This representation
/// is used as intermediate state in the parser.
///
/// This does not include ASCII character classes, since they can only appear
/// within a set character class.
</span><span class="attribute">#[derive(Clone, Debug, Eq, PartialEq)]
</span><span class="kw">enum </span>Primitive {
Literal(ast::Literal),
Assertion(ast::Assertion),
Dot(Span),
Perl(ast::ClassPerl),
Unicode(ast::ClassUnicode),
}
<span class="kw">impl </span>Primitive {
<span class="doccomment">/// Return the span of this primitive.
</span><span class="kw">fn </span>span(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;</span>Span {
<span class="kw">match </span><span class="kw-2">*</span><span class="self">self </span>{
Primitive::Literal(<span class="kw-2">ref </span>x) =&gt; <span class="kw-2">&amp;</span>x.span,
Primitive::Assertion(<span class="kw-2">ref </span>x) =&gt; <span class="kw-2">&amp;</span>x.span,
Primitive::Dot(<span class="kw-2">ref </span>span) =&gt; span,
Primitive::Perl(<span class="kw-2">ref </span>x) =&gt; <span class="kw-2">&amp;</span>x.span,
Primitive::Unicode(<span class="kw-2">ref </span>x) =&gt; <span class="kw-2">&amp;</span>x.span,
}
}
<span class="doccomment">/// Convert this primitive into a proper AST.
</span><span class="kw">fn </span>into_ast(<span class="self">self</span>) -&gt; Ast {
<span class="kw">match </span><span class="self">self </span>{
Primitive::Literal(lit) =&gt; Ast::Literal(lit),
Primitive::Assertion(assert) =&gt; Ast::Assertion(assert),
Primitive::Dot(span) =&gt; Ast::Dot(span),
Primitive::Perl(cls) =&gt; Ast::Class(ast::Class::Perl(cls)),
Primitive::Unicode(cls) =&gt; Ast::Class(ast::Class::Unicode(cls)),
}
}
<span class="doccomment">/// Convert this primitive into an item in a character class.
///
/// If this primitive is not a legal item (i.e., an assertion or a dot),
/// then return an error.
</span><span class="kw">fn </span>into_class_set_item&lt;P: Borrow&lt;Parser&gt;&gt;(
<span class="self">self</span>,
p: <span class="kw-2">&amp;</span>ParserI&lt;<span class="lifetime">&#39;_</span>, P&gt;,
) -&gt; <span class="prelude-ty">Result</span>&lt;ast::ClassSetItem&gt; {
<span class="kw">use </span><span class="self">self</span>::Primitive::<span class="kw-2">*</span>;
<span class="kw">use </span><span class="kw">crate</span>::ast::ClassSetItem;
<span class="kw">match </span><span class="self">self </span>{
Literal(lit) =&gt; <span class="prelude-val">Ok</span>(ClassSetItem::Literal(lit)),
Perl(cls) =&gt; <span class="prelude-val">Ok</span>(ClassSetItem::Perl(cls)),
Unicode(cls) =&gt; <span class="prelude-val">Ok</span>(ClassSetItem::Unicode(cls)),
x =&gt; <span class="prelude-val">Err</span>(p.error(<span class="kw-2">*</span>x.span(), ast::ErrorKind::ClassEscapeInvalid)),
}
}
<span class="doccomment">/// Convert this primitive into a literal in a character class. In
/// particular, literals are the only valid items that can appear in
/// ranges.
///
/// If this primitive is not a legal item (i.e., a class, assertion or a
/// dot), then return an error.
</span><span class="kw">fn </span>into_class_literal&lt;P: Borrow&lt;Parser&gt;&gt;(
<span class="self">self</span>,
p: <span class="kw-2">&amp;</span>ParserI&lt;<span class="lifetime">&#39;_</span>, P&gt;,
) -&gt; <span class="prelude-ty">Result</span>&lt;ast::Literal&gt; {
<span class="kw">use </span><span class="self">self</span>::Primitive::<span class="kw-2">*</span>;
<span class="kw">match </span><span class="self">self </span>{
Literal(lit) =&gt; <span class="prelude-val">Ok</span>(lit),
x =&gt; <span class="prelude-val">Err</span>(p.error(<span class="kw-2">*</span>x.span(), ast::ErrorKind::ClassRangeLiteral)),
}
}
}
<span class="doccomment">/// Returns true if the given character is a hexadecimal digit.
</span><span class="kw">fn </span>is_hex(c: char) -&gt; bool {
(<span class="string">&#39;0&#39; </span>&lt;= c &amp;&amp; c &lt;= <span class="string">&#39;9&#39;</span>) || (<span class="string">&#39;a&#39; </span>&lt;= c &amp;&amp; c &lt;= <span class="string">&#39;f&#39;</span>) || (<span class="string">&#39;A&#39; </span>&lt;= c &amp;&amp; c &lt;= <span class="string">&#39;F&#39;</span>)
}
<span class="doccomment">/// Returns true if the given character is a valid in a capture group name.
///
/// If `first` is true, then `c` is treated as the first character in the
/// group name (which must be alphabetic or underscore).
</span><span class="kw">fn </span>is_capture_char(c: char, first: bool) -&gt; bool {
<span class="kw">if </span>first {
c == <span class="string">&#39;_&#39; </span>|| c.is_alphabetic()
} <span class="kw">else </span>{
c == <span class="string">&#39;_&#39; </span>|| c == <span class="string">&#39;.&#39; </span>|| c == <span class="string">&#39;[&#39; </span>|| c == <span class="string">&#39;]&#39; </span>|| c.is_alphanumeric()
}
}
<span class="doccomment">/// A builder for a regular expression parser.
///
/// This builder permits modifying configuration options for the parser.
</span><span class="attribute">#[derive(Clone, Debug)]
</span><span class="kw">pub struct </span>ParserBuilder {
ignore_whitespace: bool,
nest_limit: u32,
octal: bool,
}
<span class="kw">impl </span>Default <span class="kw">for </span>ParserBuilder {
<span class="kw">fn </span>default() -&gt; ParserBuilder {
ParserBuilder::new()
}
}
<span class="kw">impl </span>ParserBuilder {
<span class="doccomment">/// Create a new parser builder with a default configuration.
</span><span class="kw">pub fn </span>new() -&gt; ParserBuilder {
ParserBuilder {
ignore_whitespace: <span class="bool-val">false</span>,
nest_limit: <span class="number">250</span>,
octal: <span class="bool-val">false</span>,
}
}
<span class="doccomment">/// Build a parser from this configuration with the given pattern.
</span><span class="kw">pub fn </span>build(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; Parser {
Parser {
pos: Cell::new(Position { offset: <span class="number">0</span>, line: <span class="number">1</span>, column: <span class="number">1 </span>}),
capture_index: Cell::new(<span class="number">0</span>),
nest_limit: <span class="self">self</span>.nest_limit,
octal: <span class="self">self</span>.octal,
initial_ignore_whitespace: <span class="self">self</span>.ignore_whitespace,
ignore_whitespace: Cell::new(<span class="self">self</span>.ignore_whitespace),
comments: RefCell::new(<span class="macro">vec!</span>[]),
stack_group: RefCell::new(<span class="macro">vec!</span>[]),
stack_class: RefCell::new(<span class="macro">vec!</span>[]),
capture_names: RefCell::new(<span class="macro">vec!</span>[]),
scratch: RefCell::new(String::new()),
}
}
<span class="doccomment">/// Set the nesting limit for this parser.
///
/// The nesting limit controls how deep the abstract syntax tree is allowed
/// to be. If the AST exceeds the given limit (e.g., with too many nested
/// groups), then an error is returned by the parser.
///
/// The purpose of this limit is to act as a heuristic to prevent stack
/// overflow for consumers that do structural induction on an `Ast` using
/// explicit recursion. While this crate never does this (instead using
/// constant stack space and moving the call stack to the heap), other
/// crates may.
///
/// This limit is not checked until the entire AST is parsed. Therefore,
/// if callers want to put a limit on the amount of heap space used, then
/// they should impose a limit on the length, in bytes, of the concrete
/// pattern string. In particular, this is viable since this parser
/// implementation will limit itself to heap space proportional to the
/// length of the pattern string.
///
/// Note that a nest limit of `0` will return a nest limit error for most
/// patterns but not all. For example, a nest limit of `0` permits `a` but
/// not `ab`, since `ab` requires a concatenation, which results in a nest
/// depth of `1`. In general, a nest limit is not something that manifests
/// in an obvious way in the concrete syntax, therefore, it should not be
/// used in a granular way.
</span><span class="kw">pub fn </span>nest_limit(<span class="kw-2">&amp;mut </span><span class="self">self</span>, limit: u32) -&gt; <span class="kw-2">&amp;mut </span>ParserBuilder {
<span class="self">self</span>.nest_limit = limit;
<span class="self">self
</span>}
<span class="doccomment">/// Whether to support octal syntax or not.
///
/// Octal syntax is a little-known way of uttering Unicode codepoints in
/// a regular expression. For example, `a`, `\x61`, `\u0061` and
/// `\141` are all equivalent regular expressions, where the last example
/// shows octal syntax.
///
/// While supporting octal syntax isn&#39;t in and of itself a problem, it does
/// make good error messages harder. That is, in PCRE based regex engines,
/// syntax like `\0` invokes a backreference, which is explicitly
/// unsupported in Rust&#39;s regex engine. However, many users expect it to
/// be supported. Therefore, when octal support is disabled, the error
/// message will explicitly mention that backreferences aren&#39;t supported.
///
/// Octal syntax is disabled by default.
</span><span class="kw">pub fn </span>octal(<span class="kw-2">&amp;mut </span><span class="self">self</span>, yes: bool) -&gt; <span class="kw-2">&amp;mut </span>ParserBuilder {
<span class="self">self</span>.octal = yes;
<span class="self">self
</span>}
<span class="doccomment">/// Enable verbose mode in the regular expression.
///
/// When enabled, verbose mode permits insignificant whitespace in many
/// places in the regular expression, as well as comments. Comments are
/// started using `#` and continue until the end of the line.
///
/// By default, this is disabled. It may be selectively enabled in the
/// regular expression by using the `x` flag regardless of this setting.
</span><span class="kw">pub fn </span>ignore_whitespace(<span class="kw-2">&amp;mut </span><span class="self">self</span>, yes: bool) -&gt; <span class="kw-2">&amp;mut </span>ParserBuilder {
<span class="self">self</span>.ignore_whitespace = yes;
<span class="self">self
</span>}
}
<span class="doccomment">/// A regular expression parser.
///
/// This parses a string representation of a regular expression into an
/// abstract syntax tree. The size of the tree is proportional to the length
/// of the regular expression pattern.
///
/// A `Parser` can be configured in more detail via a [`ParserBuilder`].
</span><span class="attribute">#[derive(Clone, Debug)]
</span><span class="kw">pub struct </span>Parser {
<span class="doccomment">/// The current position of the parser.
</span>pos: Cell&lt;Position&gt;,
<span class="doccomment">/// The current capture index.
</span>capture_index: Cell&lt;u32&gt;,
<span class="doccomment">/// The maximum number of open parens/brackets allowed. If the parser
/// exceeds this number, then an error is returned.
</span>nest_limit: u32,
<span class="doccomment">/// Whether to support octal syntax or not. When `false`, the parser will
/// return an error helpfully pointing out that backreferences are not
/// supported.
</span>octal: bool,
<span class="doccomment">/// The initial setting for `ignore_whitespace` as provided by
/// `ParserBuilder`. It is used when resetting the parser&#39;s state.
</span>initial_ignore_whitespace: bool,
<span class="doccomment">/// Whether whitespace should be ignored. When enabled, comments are
/// also permitted.
</span>ignore_whitespace: Cell&lt;bool&gt;,
<span class="doccomment">/// A list of comments, in order of appearance.
</span>comments: RefCell&lt;Vec&lt;ast::Comment&gt;&gt;,
<span class="doccomment">/// A stack of grouped sub-expressions, including alternations.
</span>stack_group: RefCell&lt;Vec&lt;GroupState&gt;&gt;,
<span class="doccomment">/// A stack of nested character classes. This is only non-empty when
/// parsing a class.
</span>stack_class: RefCell&lt;Vec&lt;ClassState&gt;&gt;,
<span class="doccomment">/// A sorted sequence of capture names. This is used to detect duplicate
/// capture names and report an error if one is detected.
</span>capture_names: RefCell&lt;Vec&lt;ast::CaptureName&gt;&gt;,
<span class="doccomment">/// A scratch buffer used in various places. Mostly this is used to
/// accumulate relevant characters from parts of a pattern.
</span>scratch: RefCell&lt;String&gt;,
}
<span class="doccomment">/// ParserI is the internal parser implementation.
///
/// We use this separate type so that we can carry the provided pattern string
/// along with us. In particular, a `Parser` internal state is not tied to any
/// one pattern, but `ParserI` is.
///
/// This type also lets us use `ParserI&lt;&amp;Parser&gt;` in production code while
/// retaining the convenience of `ParserI&lt;Parser&gt;` for tests, which sometimes
/// work against the internal interface of the parser.
</span><span class="attribute">#[derive(Clone, Debug)]
</span><span class="kw">struct </span>ParserI&lt;<span class="lifetime">&#39;s</span>, P&gt; {
<span class="doccomment">/// The parser state/configuration.
</span>parser: P,
<span class="doccomment">/// The full regular expression provided by the user.
</span>pattern: <span class="kw-2">&amp;</span><span class="lifetime">&#39;s </span>str,
}
<span class="doccomment">/// GroupState represents a single stack frame while parsing nested groups
/// and alternations. Each frame records the state up to an opening parenthesis
/// or a alternating bracket `|`.
</span><span class="attribute">#[derive(Clone, Debug)]
</span><span class="kw">enum </span>GroupState {
<span class="doccomment">/// This state is pushed whenever an opening group is found.
</span>Group {
<span class="doccomment">/// The concatenation immediately preceding the opening group.
</span>concat: ast::Concat,
<span class="doccomment">/// The group that has been opened. Its sub-AST is always empty.
</span>group: ast::Group,
<span class="doccomment">/// Whether this group has the `x` flag enabled or not.
</span>ignore_whitespace: bool,
},
<span class="doccomment">/// This state is pushed whenever a new alternation branch is found. If
/// an alternation branch is found and this state is at the top of the
/// stack, then this state should be modified to include the new
/// alternation.
</span>Alternation(ast::Alternation),
}
<span class="doccomment">/// ClassState represents a single stack frame while parsing character classes.
/// Each frame records the state up to an intersection, difference, symmetric
/// difference or nested class.
///
/// Note that a parser&#39;s character class stack is only non-empty when parsing
/// a character class. In all other cases, it is empty.
</span><span class="attribute">#[derive(Clone, Debug)]
</span><span class="kw">enum </span>ClassState {
<span class="doccomment">/// This state is pushed whenever an opening bracket is found.
</span>Open {
<span class="doccomment">/// The union of class items immediately preceding this class.
</span><span class="kw">union</span>: ast::ClassSetUnion,
<span class="doccomment">/// The class that has been opened. Typically this just corresponds
/// to the `[`, but it can also include `[^` since `^` indicates
/// negation of the class.
</span>set: ast::ClassBracketed,
},
<span class="doccomment">/// This state is pushed when a operator is seen. When popped, the stored
/// set becomes the left hand side of the operator.
</span>Op {
<span class="doccomment">/// The type of the operation, i.e., &amp;&amp;, -- or ~~.
</span>kind: ast::ClassSetBinaryOpKind,
<span class="doccomment">/// The left-hand side of the operator.
</span>lhs: ast::ClassSet,
},
}
<span class="kw">impl </span>Parser {
<span class="doccomment">/// Create a new parser with a default configuration.
///
/// The parser can be run with either the `parse` or `parse_with_comments`
/// methods. The parse methods return an abstract syntax tree.
///
/// To set configuration options on the parser, use [`ParserBuilder`].
</span><span class="kw">pub fn </span>new() -&gt; Parser {
ParserBuilder::new().build()
}
<span class="doccomment">/// Parse the regular expression into an abstract syntax tree.
</span><span class="kw">pub fn </span>parse(<span class="kw-2">&amp;mut </span><span class="self">self</span>, pattern: <span class="kw-2">&amp;</span>str) -&gt; <span class="prelude-ty">Result</span>&lt;Ast&gt; {
ParserI::new(<span class="self">self</span>, pattern).parse()
}
<span class="doccomment">/// Parse the regular expression and return an abstract syntax tree with
/// all of the comments found in the pattern.
</span><span class="kw">pub fn </span>parse_with_comments(
<span class="kw-2">&amp;mut </span><span class="self">self</span>,
pattern: <span class="kw-2">&amp;</span>str,
) -&gt; <span class="prelude-ty">Result</span>&lt;ast::WithComments&gt; {
ParserI::new(<span class="self">self</span>, pattern).parse_with_comments()
}
<span class="doccomment">/// Reset the internal state of a parser.
///
/// This is called at the beginning of every parse. This prevents the
/// parser from running with inconsistent state (say, if a previous
/// invocation returned an error and the parser is reused).
</span><span class="kw">fn </span>reset(<span class="kw-2">&amp;</span><span class="self">self</span>) {
<span class="comment">// These settings should be in line with the construction
// in `ParserBuilder::build`.
</span><span class="self">self</span>.pos.set(Position { offset: <span class="number">0</span>, line: <span class="number">1</span>, column: <span class="number">1 </span>});
<span class="self">self</span>.ignore_whitespace.set(<span class="self">self</span>.initial_ignore_whitespace);
<span class="self">self</span>.comments.borrow_mut().clear();
<span class="self">self</span>.stack_group.borrow_mut().clear();
<span class="self">self</span>.stack_class.borrow_mut().clear();
}
}
<span class="kw">impl</span>&lt;<span class="lifetime">&#39;s</span>, P: Borrow&lt;Parser&gt;&gt; ParserI&lt;<span class="lifetime">&#39;s</span>, P&gt; {
<span class="doccomment">/// Build an internal parser from a parser configuration and a pattern.
</span><span class="kw">fn </span>new(parser: P, pattern: <span class="kw-2">&amp;</span><span class="lifetime">&#39;s </span>str) -&gt; ParserI&lt;<span class="lifetime">&#39;s</span>, P&gt; {
ParserI { parser, pattern }
}
<span class="doccomment">/// Return a reference to the parser state.
</span><span class="kw">fn </span>parser(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;</span>Parser {
<span class="self">self</span>.parser.borrow()
}
<span class="doccomment">/// Return a reference to the pattern being parsed.
</span><span class="kw">fn </span>pattern(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;</span>str {
<span class="self">self</span>.pattern.borrow()
}
<span class="doccomment">/// Create a new error with the given span and error type.
</span><span class="kw">fn </span>error(<span class="kw-2">&amp;</span><span class="self">self</span>, span: Span, kind: ast::ErrorKind) -&gt; ast::Error {
ast::Error { kind, pattern: <span class="self">self</span>.pattern().to_string(), span }
}
<span class="doccomment">/// Return the current offset of the parser.
///
/// The offset starts at `0` from the beginning of the regular expression
/// pattern string.
</span><span class="kw">fn </span>offset(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; usize {
<span class="self">self</span>.parser().pos.get().offset
}
<span class="doccomment">/// Return the current line number of the parser.
///
/// The line number starts at `1`.
</span><span class="kw">fn </span>line(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; usize {
<span class="self">self</span>.parser().pos.get().line
}
<span class="doccomment">/// Return the current column of the parser.
///
/// The column number starts at `1` and is reset whenever a `\n` is seen.
</span><span class="kw">fn </span>column(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; usize {
<span class="self">self</span>.parser().pos.get().column
}
<span class="doccomment">/// Return the next capturing index. Each subsequent call increments the
/// internal index.
///
/// The span given should correspond to the location of the opening
/// parenthesis.
///
/// If the capture limit is exceeded, then an error is returned.
</span><span class="kw">fn </span>next_capture_index(<span class="kw-2">&amp;</span><span class="self">self</span>, span: Span) -&gt; <span class="prelude-ty">Result</span>&lt;u32&gt; {
<span class="kw">let </span>current = <span class="self">self</span>.parser().capture_index.get();
<span class="kw">let </span>i = current.checked_add(<span class="number">1</span>).ok_or_else(|| {
<span class="self">self</span>.error(span, ast::ErrorKind::CaptureLimitExceeded)
})<span class="question-mark">?</span>;
<span class="self">self</span>.parser().capture_index.set(i);
<span class="prelude-val">Ok</span>(i)
}
<span class="doccomment">/// Adds the given capture name to this parser. If this capture name has
/// already been used, then an error is returned.
</span><span class="kw">fn </span>add_capture_name(<span class="kw-2">&amp;</span><span class="self">self</span>, cap: <span class="kw-2">&amp;</span>ast::CaptureName) -&gt; <span class="prelude-ty">Result</span>&lt;()&gt; {
<span class="kw">let </span><span class="kw-2">mut </span>names = <span class="self">self</span>.parser().capture_names.borrow_mut();
<span class="kw">match </span>names
.binary_search_by_key(<span class="kw-2">&amp;</span>cap.name.as_str(), |c| c.name.as_str())
{
<span class="prelude-val">Err</span>(i) =&gt; {
names.insert(i, cap.clone());
<span class="prelude-val">Ok</span>(())
}
<span class="prelude-val">Ok</span>(i) =&gt; <span class="prelude-val">Err</span>(<span class="self">self</span>.error(
cap.span,
ast::ErrorKind::GroupNameDuplicate { original: names[i].span },
)),
}
}
<span class="doccomment">/// Return whether the parser should ignore whitespace or not.
</span><span class="kw">fn </span>ignore_whitespace(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; bool {
<span class="self">self</span>.parser().ignore_whitespace.get()
}
<span class="doccomment">/// Return the character at the current position of the parser.
///
/// This panics if the current position does not point to a valid char.
</span><span class="kw">fn </span>char(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; char {
<span class="self">self</span>.char_at(<span class="self">self</span>.offset())
}
<span class="doccomment">/// Return the character at the given position.
///
/// This panics if the given position does not point to a valid char.
</span><span class="kw">fn </span>char_at(<span class="kw-2">&amp;</span><span class="self">self</span>, i: usize) -&gt; char {
<span class="self">self</span>.pattern()[i..]
.chars()
.next()
.unwrap_or_else(|| <span class="macro">panic!</span>(<span class="string">&quot;expected char at offset {}&quot;</span>, i))
}
<span class="doccomment">/// Bump the parser to the next Unicode scalar value.
///
/// If the end of the input has been reached, then `false` is returned.
</span><span class="kw">fn </span>bump(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; bool {
<span class="kw">if </span><span class="self">self</span>.is_eof() {
<span class="kw">return </span><span class="bool-val">false</span>;
}
<span class="kw">let </span>Position { <span class="kw-2">mut </span>offset, <span class="kw-2">mut </span>line, <span class="kw-2">mut </span>column } = <span class="self">self</span>.pos();
<span class="kw">if </span><span class="self">self</span>.char() == <span class="string">&#39;\n&#39; </span>{
line = line.checked_add(<span class="number">1</span>).unwrap();
column = <span class="number">1</span>;
} <span class="kw">else </span>{
column = column.checked_add(<span class="number">1</span>).unwrap();
}
offset += <span class="self">self</span>.char().len_utf8();
<span class="self">self</span>.parser().pos.set(Position { offset, line, column });
<span class="self">self</span>.pattern()[<span class="self">self</span>.offset()..].chars().next().is_some()
}
<span class="doccomment">/// If the substring starting at the current position of the parser has
/// the given prefix, then bump the parser to the character immediately
/// following the prefix and return true. Otherwise, don&#39;t bump the parser
/// and return false.
</span><span class="kw">fn </span>bump_if(<span class="kw-2">&amp;</span><span class="self">self</span>, prefix: <span class="kw-2">&amp;</span>str) -&gt; bool {
<span class="kw">if </span><span class="self">self</span>.pattern()[<span class="self">self</span>.offset()..].starts_with(prefix) {
<span class="kw">for _ in </span><span class="number">0</span>..prefix.chars().count() {
<span class="self">self</span>.bump();
}
<span class="bool-val">true
</span>} <span class="kw">else </span>{
<span class="bool-val">false
</span>}
}
<span class="doccomment">/// Returns true if and only if the parser is positioned at a look-around
/// prefix. The conditions under which this returns true must always
/// correspond to a regular expression that would otherwise be consider
/// invalid.
///
/// This should only be called immediately after parsing the opening of
/// a group or a set of flags.
</span><span class="kw">fn </span>is_lookaround_prefix(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; bool {
<span class="self">self</span>.bump_if(<span class="string">&quot;?=&quot;</span>)
|| <span class="self">self</span>.bump_if(<span class="string">&quot;?!&quot;</span>)
|| <span class="self">self</span>.bump_if(<span class="string">&quot;?&lt;=&quot;</span>)
|| <span class="self">self</span>.bump_if(<span class="string">&quot;?&lt;!&quot;</span>)
}
<span class="doccomment">/// Bump the parser, and if the `x` flag is enabled, bump through any
/// subsequent spaces. Return true if and only if the parser is not at
/// EOF.
</span><span class="kw">fn </span>bump_and_bump_space(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; bool {
<span class="kw">if </span>!<span class="self">self</span>.bump() {
<span class="kw">return </span><span class="bool-val">false</span>;
}
<span class="self">self</span>.bump_space();
!<span class="self">self</span>.is_eof()
}
<span class="doccomment">/// If the `x` flag is enabled (i.e., whitespace insensitivity with
/// comments), then this will advance the parser through all whitespace
/// and comments to the next non-whitespace non-comment byte.
///
/// If the `x` flag is disabled, then this is a no-op.
///
/// This should be used selectively throughout the parser where
/// arbitrary whitespace is permitted when the `x` flag is enabled. For
/// example, `{ 5 , 6}` is equivalent to `{5,6}`.
</span><span class="kw">fn </span>bump_space(<span class="kw-2">&amp;</span><span class="self">self</span>) {
<span class="kw">if </span>!<span class="self">self</span>.ignore_whitespace() {
<span class="kw">return</span>;
}
<span class="kw">while </span>!<span class="self">self</span>.is_eof() {
<span class="kw">if </span><span class="self">self</span>.char().is_whitespace() {
<span class="self">self</span>.bump();
} <span class="kw">else if </span><span class="self">self</span>.char() == <span class="string">&#39;#&#39; </span>{
<span class="kw">let </span>start = <span class="self">self</span>.pos();
<span class="kw">let </span><span class="kw-2">mut </span>comment_text = String::new();
<span class="self">self</span>.bump();
<span class="kw">while </span>!<span class="self">self</span>.is_eof() {
<span class="kw">let </span>c = <span class="self">self</span>.char();
<span class="self">self</span>.bump();
<span class="kw">if </span>c == <span class="string">&#39;\n&#39; </span>{
<span class="kw">break</span>;
}
comment_text.push(c);
}
<span class="kw">let </span>comment = ast::Comment {
span: Span::new(start, <span class="self">self</span>.pos()),
comment: comment_text,
};
<span class="self">self</span>.parser().comments.borrow_mut().push(comment);
} <span class="kw">else </span>{
<span class="kw">break</span>;
}
}
}
<span class="doccomment">/// Peek at the next character in the input without advancing the parser.
///
/// If the input has been exhausted, then this returns `None`.
</span><span class="kw">fn </span>peek(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="prelude-ty">Option</span>&lt;char&gt; {
<span class="kw">if </span><span class="self">self</span>.is_eof() {
<span class="kw">return </span><span class="prelude-val">None</span>;
}
<span class="self">self</span>.pattern()[<span class="self">self</span>.offset() + <span class="self">self</span>.char().len_utf8()..].chars().next()
}
<span class="doccomment">/// Like peek, but will ignore spaces when the parser is in whitespace
/// insensitive mode.
</span><span class="kw">fn </span>peek_space(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="prelude-ty">Option</span>&lt;char&gt; {
<span class="kw">if </span>!<span class="self">self</span>.ignore_whitespace() {
<span class="kw">return </span><span class="self">self</span>.peek();
}
<span class="kw">if </span><span class="self">self</span>.is_eof() {
<span class="kw">return </span><span class="prelude-val">None</span>;
}
<span class="kw">let </span><span class="kw-2">mut </span>start = <span class="self">self</span>.offset() + <span class="self">self</span>.char().len_utf8();
<span class="kw">let </span><span class="kw-2">mut </span>in_comment = <span class="bool-val">false</span>;
<span class="kw">for </span>(i, c) <span class="kw">in </span><span class="self">self</span>.pattern()[start..].char_indices() {
<span class="kw">if </span>c.is_whitespace() {
<span class="kw">continue</span>;
} <span class="kw">else if </span>!in_comment &amp;&amp; c == <span class="string">&#39;#&#39; </span>{
in_comment = <span class="bool-val">true</span>;
} <span class="kw">else if </span>in_comment &amp;&amp; c == <span class="string">&#39;\n&#39; </span>{
in_comment = <span class="bool-val">false</span>;
} <span class="kw">else </span>{
start += i;
<span class="kw">break</span>;
}
}
<span class="self">self</span>.pattern()[start..].chars().next()
}
<span class="doccomment">/// Returns true if the next call to `bump` would return false.
</span><span class="kw">fn </span>is_eof(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; bool {
<span class="self">self</span>.offset() == <span class="self">self</span>.pattern().len()
}
<span class="doccomment">/// Return the current position of the parser, which includes the offset,
/// line and column.
</span><span class="kw">fn </span>pos(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; Position {
<span class="self">self</span>.parser().pos.get()
}
<span class="doccomment">/// Create a span at the current position of the parser. Both the start
/// and end of the span are set.
</span><span class="kw">fn </span>span(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; Span {
Span::splat(<span class="self">self</span>.pos())
}
<span class="doccomment">/// Create a span that covers the current character.
</span><span class="kw">fn </span>span_char(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; Span {
<span class="kw">let </span><span class="kw-2">mut </span>next = Position {
offset: <span class="self">self</span>.offset().checked_add(<span class="self">self</span>.char().len_utf8()).unwrap(),
line: <span class="self">self</span>.line(),
column: <span class="self">self</span>.column().checked_add(<span class="number">1</span>).unwrap(),
};
<span class="kw">if </span><span class="self">self</span>.char() == <span class="string">&#39;\n&#39; </span>{
next.line += <span class="number">1</span>;
next.column = <span class="number">1</span>;
}
Span::new(<span class="self">self</span>.pos(), next)
}
<span class="doccomment">/// Parse and push a single alternation on to the parser&#39;s internal stack.
/// If the top of the stack already has an alternation, then add to that
/// instead of pushing a new one.
///
/// The concatenation given corresponds to a single alternation branch.
/// The concatenation returned starts the next branch and is empty.
///
/// This assumes the parser is currently positioned at `|` and will advance
/// the parser to the character following `|`.
</span><span class="attribute">#[inline(never)]
</span><span class="kw">fn </span>push_alternate(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="kw-2">mut </span>concat: ast::Concat) -&gt; <span class="prelude-ty">Result</span>&lt;ast::Concat&gt; {
<span class="macro">assert_eq!</span>(<span class="self">self</span>.char(), <span class="string">&#39;|&#39;</span>);
concat.span.end = <span class="self">self</span>.pos();
<span class="self">self</span>.push_or_add_alternation(concat);
<span class="self">self</span>.bump();
<span class="prelude-val">Ok</span>(ast::Concat { span: <span class="self">self</span>.span(), asts: <span class="macro">vec!</span>[] })
}
<span class="doccomment">/// Pushes or adds the given branch of an alternation to the parser&#39;s
/// internal stack of state.
</span><span class="kw">fn </span>push_or_add_alternation(<span class="kw-2">&amp;</span><span class="self">self</span>, concat: ast::Concat) {
<span class="kw">use </span><span class="self">self</span>::GroupState::<span class="kw-2">*</span>;
<span class="kw">let </span><span class="kw-2">mut </span>stack = <span class="self">self</span>.parser().stack_group.borrow_mut();
<span class="kw">if let </span><span class="prelude-val">Some</span>(<span class="kw-2">&amp;mut </span>Alternation(<span class="kw-2">ref mut </span>alts)) = stack.last_mut() {
alts.asts.push(concat.into_ast());
<span class="kw">return</span>;
}
stack.push(Alternation(ast::Alternation {
span: Span::new(concat.span.start, <span class="self">self</span>.pos()),
asts: <span class="macro">vec!</span>[concat.into_ast()],
}));
}
<span class="doccomment">/// Parse and push a group AST (and its parent concatenation) on to the
/// parser&#39;s internal stack. Return a fresh concatenation corresponding
/// to the group&#39;s sub-AST.
///
/// If a set of flags was found (with no group), then the concatenation
/// is returned with that set of flags added.
///
/// This assumes that the parser is currently positioned on the opening
/// parenthesis. It advances the parser to the character at the start
/// of the sub-expression (or adjoining expression).
///
/// If there was a problem parsing the start of the group, then an error
/// is returned.
</span><span class="attribute">#[inline(never)]
</span><span class="kw">fn </span>push_group(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="kw-2">mut </span>concat: ast::Concat) -&gt; <span class="prelude-ty">Result</span>&lt;ast::Concat&gt; {
<span class="macro">assert_eq!</span>(<span class="self">self</span>.char(), <span class="string">&#39;(&#39;</span>);
<span class="kw">match </span><span class="self">self</span>.parse_group()<span class="question-mark">? </span>{
Either::Left(set) =&gt; {
<span class="kw">let </span>ignore = set.flags.flag_state(ast::Flag::IgnoreWhitespace);
<span class="kw">if let </span><span class="prelude-val">Some</span>(v) = ignore {
<span class="self">self</span>.parser().ignore_whitespace.set(v);
}
concat.asts.push(Ast::Flags(set));
<span class="prelude-val">Ok</span>(concat)
}
Either::Right(group) =&gt; {
<span class="kw">let </span>old_ignore_whitespace = <span class="self">self</span>.ignore_whitespace();
<span class="kw">let </span>new_ignore_whitespace = group
.flags()
.and_then(|f| f.flag_state(ast::Flag::IgnoreWhitespace))
.unwrap_or(old_ignore_whitespace);
<span class="self">self</span>.parser().stack_group.borrow_mut().push(
GroupState::Group {
concat,
group,
ignore_whitespace: old_ignore_whitespace,
},
);
<span class="self">self</span>.parser().ignore_whitespace.set(new_ignore_whitespace);
<span class="prelude-val">Ok</span>(ast::Concat { span: <span class="self">self</span>.span(), asts: <span class="macro">vec!</span>[] })
}
}
}
<span class="doccomment">/// Pop a group AST from the parser&#39;s internal stack and set the group&#39;s
/// AST to the given concatenation. Return the concatenation containing
/// the group.
///
/// This assumes that the parser is currently positioned on the closing
/// parenthesis and advances the parser to the character following the `)`.
///
/// If no such group could be popped, then an unopened group error is
/// returned.
</span><span class="attribute">#[inline(never)]
</span><span class="kw">fn </span>pop_group(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="kw-2">mut </span>group_concat: ast::Concat) -&gt; <span class="prelude-ty">Result</span>&lt;ast::Concat&gt; {
<span class="kw">use </span><span class="self">self</span>::GroupState::<span class="kw-2">*</span>;
<span class="macro">assert_eq!</span>(<span class="self">self</span>.char(), <span class="string">&#39;)&#39;</span>);
<span class="kw">let </span><span class="kw-2">mut </span>stack = <span class="self">self</span>.parser().stack_group.borrow_mut();
<span class="kw">let </span>(<span class="kw-2">mut </span>prior_concat, <span class="kw-2">mut </span>group, ignore_whitespace, alt) = <span class="kw">match </span>stack
.pop()
{
<span class="prelude-val">Some</span>(Group { concat, group, ignore_whitespace }) =&gt; {
(concat, group, ignore_whitespace, <span class="prelude-val">None</span>)
}
<span class="prelude-val">Some</span>(Alternation(alt)) =&gt; <span class="kw">match </span>stack.pop() {
<span class="prelude-val">Some</span>(Group { concat, group, ignore_whitespace }) =&gt; {
(concat, group, ignore_whitespace, <span class="prelude-val">Some</span>(alt))
}
<span class="prelude-val">None </span>| <span class="prelude-val">Some</span>(Alternation(<span class="kw">_</span>)) =&gt; {
<span class="kw">return </span><span class="prelude-val">Err</span>(<span class="self">self</span>.error(
<span class="self">self</span>.span_char(),
ast::ErrorKind::GroupUnopened,
));
}
},
<span class="prelude-val">None </span>=&gt; {
<span class="kw">return </span><span class="prelude-val">Err</span>(<span class="self">self
</span>.error(<span class="self">self</span>.span_char(), ast::ErrorKind::GroupUnopened));
}
};
<span class="self">self</span>.parser().ignore_whitespace.set(ignore_whitespace);
group_concat.span.end = <span class="self">self</span>.pos();
<span class="self">self</span>.bump();
group.span.end = <span class="self">self</span>.pos();
<span class="kw">match </span>alt {
<span class="prelude-val">Some</span>(<span class="kw-2">mut </span>alt) =&gt; {
alt.span.end = group_concat.span.end;
alt.asts.push(group_concat.into_ast());
group.ast = Box::new(alt.into_ast());
}
<span class="prelude-val">None </span>=&gt; {
group.ast = Box::new(group_concat.into_ast());
}
}
prior_concat.asts.push(Ast::Group(group));
<span class="prelude-val">Ok</span>(prior_concat)
}
<span class="doccomment">/// Pop the last state from the parser&#39;s internal stack, if it exists, and
/// add the given concatenation to it. There either must be no state or a
/// single alternation item on the stack. Any other scenario produces an
/// error.
///
/// This assumes that the parser has advanced to the end.
</span><span class="attribute">#[inline(never)]
</span><span class="kw">fn </span>pop_group_end(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="kw-2">mut </span>concat: ast::Concat) -&gt; <span class="prelude-ty">Result</span>&lt;Ast&gt; {
concat.span.end = <span class="self">self</span>.pos();
<span class="kw">let </span><span class="kw-2">mut </span>stack = <span class="self">self</span>.parser().stack_group.borrow_mut();
<span class="kw">let </span>ast = <span class="kw">match </span>stack.pop() {
<span class="prelude-val">None </span>=&gt; <span class="prelude-val">Ok</span>(concat.into_ast()),
<span class="prelude-val">Some</span>(GroupState::Alternation(<span class="kw-2">mut </span>alt)) =&gt; {
alt.span.end = <span class="self">self</span>.pos();
alt.asts.push(concat.into_ast());
<span class="prelude-val">Ok</span>(Ast::Alternation(alt))
}
<span class="prelude-val">Some</span>(GroupState::Group { group, .. }) =&gt; {
<span class="kw">return </span><span class="prelude-val">Err</span>(
<span class="self">self</span>.error(group.span, ast::ErrorKind::GroupUnclosed)
);
}
};
<span class="comment">// If we try to pop again, there should be nothing.
</span><span class="kw">match </span>stack.pop() {
<span class="prelude-val">None </span>=&gt; ast,
<span class="prelude-val">Some</span>(GroupState::Alternation(<span class="kw">_</span>)) =&gt; {
<span class="comment">// This unreachable is unfortunate. This case can&#39;t happen
// because the only way we can be here is if there were two
// `GroupState::Alternation`s adjacent in the parser&#39;s stack,
// which we guarantee to never happen because we never push a
// `GroupState::Alternation` if one is already at the top of
// the stack.
</span><span class="macro">unreachable!</span>()
}
<span class="prelude-val">Some</span>(GroupState::Group { group, .. }) =&gt; {
<span class="prelude-val">Err</span>(<span class="self">self</span>.error(group.span, ast::ErrorKind::GroupUnclosed))
}
}
}
<span class="doccomment">/// Parse the opening of a character class and push the current class
/// parsing context onto the parser&#39;s stack. This assumes that the parser
/// is positioned at an opening `[`. The given union should correspond to
/// the union of set items built up before seeing the `[`.
///
/// If there was a problem parsing the opening of the class, then an error
/// is returned. Otherwise, a new union of set items for the class is
/// returned (which may be populated with either a `]` or a `-`).
</span><span class="attribute">#[inline(never)]
</span><span class="kw">fn </span>push_class_open(
<span class="kw-2">&amp;</span><span class="self">self</span>,
parent_union: ast::ClassSetUnion,
) -&gt; <span class="prelude-ty">Result</span>&lt;ast::ClassSetUnion&gt; {
<span class="macro">assert_eq!</span>(<span class="self">self</span>.char(), <span class="string">&#39;[&#39;</span>);
<span class="kw">let </span>(nested_set, nested_union) = <span class="self">self</span>.parse_set_class_open()<span class="question-mark">?</span>;
<span class="self">self</span>.parser()
.stack_class
.borrow_mut()
.push(ClassState::Open { <span class="kw">union</span>: parent_union, set: nested_set });
<span class="prelude-val">Ok</span>(nested_union)
}
<span class="doccomment">/// Parse the end of a character class set and pop the character class
/// parser stack. The union given corresponds to the last union built
/// before seeing the closing `]`. The union returned corresponds to the
/// parent character class set with the nested class added to it.
///
/// This assumes that the parser is positioned at a `]` and will advance
/// the parser to the byte immediately following the `]`.
///
/// If the stack is empty after popping, then this returns the final
/// &quot;top-level&quot; character class AST (where a &quot;top-level&quot; character class
/// is one that is not nested inside any other character class).
///
/// If there is no corresponding opening bracket on the parser&#39;s stack,
/// then an error is returned.
</span><span class="attribute">#[inline(never)]
</span><span class="kw">fn </span>pop_class(
<span class="kw-2">&amp;</span><span class="self">self</span>,
nested_union: ast::ClassSetUnion,
) -&gt; <span class="prelude-ty">Result</span>&lt;Either&lt;ast::ClassSetUnion, ast::Class&gt;&gt; {
<span class="macro">assert_eq!</span>(<span class="self">self</span>.char(), <span class="string">&#39;]&#39;</span>);
<span class="kw">let </span>item = ast::ClassSet::Item(nested_union.into_item());
<span class="kw">let </span>prevset = <span class="self">self</span>.pop_class_op(item);
<span class="kw">let </span><span class="kw-2">mut </span>stack = <span class="self">self</span>.parser().stack_class.borrow_mut();
<span class="kw">match </span>stack.pop() {
<span class="prelude-val">None </span>=&gt; {
<span class="comment">// We can never observe an empty stack:
//
// 1) We are guaranteed to start with a non-empty stack since
// the character class parser is only initiated when it sees
// a `[`.
// 2) If we ever observe an empty stack while popping after
// seeing a `]`, then we signal the character class parser
// to terminate.
</span><span class="macro">panic!</span>(<span class="string">&quot;unexpected empty character class stack&quot;</span>)
}
<span class="prelude-val">Some</span>(ClassState::Op { .. }) =&gt; {
<span class="comment">// This panic is unfortunate, but this case is impossible
// since we already popped the Op state if one exists above.
// Namely, every push to the class parser stack is guarded by
// whether an existing Op is already on the top of the stack.
// If it is, the existing Op is modified. That is, the stack
// can never have consecutive Op states.
</span><span class="macro">panic!</span>(<span class="string">&quot;unexpected ClassState::Op&quot;</span>)
}
<span class="prelude-val">Some</span>(ClassState::Open { <span class="kw-2">mut </span>union, <span class="kw-2">mut </span>set }) =&gt; {
<span class="self">self</span>.bump();
set.span.end = <span class="self">self</span>.pos();
set.kind = prevset;
<span class="kw">if </span>stack.is_empty() {
<span class="prelude-val">Ok</span>(Either::Right(ast::Class::Bracketed(set)))
} <span class="kw">else </span>{
union.push(ast::ClassSetItem::Bracketed(Box::new(set)));
<span class="prelude-val">Ok</span>(Either::Left(union))
}
}
}
}
<span class="doccomment">/// Return an &quot;unclosed class&quot; error whose span points to the most
/// recently opened class.
///
/// This should only be called while parsing a character class.
</span><span class="attribute">#[inline(never)]
</span><span class="kw">fn </span>unclosed_class_error(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; ast::Error {
<span class="kw">for </span>state <span class="kw">in </span><span class="self">self</span>.parser().stack_class.borrow().iter().rev() {
<span class="kw">if let </span>ClassState::Open { <span class="kw-2">ref </span>set, .. } = <span class="kw-2">*</span>state {
<span class="kw">return </span><span class="self">self</span>.error(set.span, ast::ErrorKind::ClassUnclosed);
}
}
<span class="comment">// We are guaranteed to have a non-empty stack with at least
// one open bracket, so we should never get here.
</span><span class="macro">panic!</span>(<span class="string">&quot;no open character class found&quot;</span>)
}
<span class="doccomment">/// Push the current set of class items on to the class parser&#39;s stack as
/// the left hand side of the given operator.
///
/// A fresh set union is returned, which should be used to build the right
/// hand side of this operator.
</span><span class="attribute">#[inline(never)]
</span><span class="kw">fn </span>push_class_op(
<span class="kw-2">&amp;</span><span class="self">self</span>,
next_kind: ast::ClassSetBinaryOpKind,
next_union: ast::ClassSetUnion,
) -&gt; ast::ClassSetUnion {
<span class="kw">let </span>item = ast::ClassSet::Item(next_union.into_item());
<span class="kw">let </span>new_lhs = <span class="self">self</span>.pop_class_op(item);
<span class="self">self</span>.parser()
.stack_class
.borrow_mut()
.push(ClassState::Op { kind: next_kind, lhs: new_lhs });
ast::ClassSetUnion { span: <span class="self">self</span>.span(), items: <span class="macro">vec!</span>[] }
}
<span class="doccomment">/// Pop a character class set from the character class parser stack. If the
/// top of the stack is just an item (not an operation), then return the
/// given set unchanged. If the top of the stack is an operation, then the
/// given set will be used as the rhs of the operation on the top of the
/// stack. In that case, the binary operation is returned as a set.
</span><span class="attribute">#[inline(never)]
</span><span class="kw">fn </span>pop_class_op(<span class="kw-2">&amp;</span><span class="self">self</span>, rhs: ast::ClassSet) -&gt; ast::ClassSet {
<span class="kw">let </span><span class="kw-2">mut </span>stack = <span class="self">self</span>.parser().stack_class.borrow_mut();
<span class="kw">let </span>(kind, lhs) = <span class="kw">match </span>stack.pop() {
<span class="prelude-val">Some</span>(ClassState::Op { kind, lhs }) =&gt; (kind, lhs),
<span class="prelude-val">Some</span>(state @ ClassState::Open { .. }) =&gt; {
stack.push(state);
<span class="kw">return </span>rhs;
}
<span class="prelude-val">None </span>=&gt; <span class="macro">unreachable!</span>(),
};
<span class="kw">let </span>span = Span::new(lhs.span().start, rhs.span().end);
ast::ClassSet::BinaryOp(ast::ClassSetBinaryOp {
span,
kind,
lhs: Box::new(lhs),
rhs: Box::new(rhs),
})
}
}
<span class="kw">impl</span>&lt;<span class="lifetime">&#39;s</span>, P: Borrow&lt;Parser&gt;&gt; ParserI&lt;<span class="lifetime">&#39;s</span>, P&gt; {
<span class="doccomment">/// Parse the regular expression into an abstract syntax tree.
</span><span class="kw">fn </span>parse(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="prelude-ty">Result</span>&lt;Ast&gt; {
<span class="self">self</span>.parse_with_comments().map(|astc| astc.ast)
}
<span class="doccomment">/// Parse the regular expression and return an abstract syntax tree with
/// all of the comments found in the pattern.
</span><span class="kw">fn </span>parse_with_comments(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="prelude-ty">Result</span>&lt;ast::WithComments&gt; {
<span class="macro">assert_eq!</span>(<span class="self">self</span>.offset(), <span class="number">0</span>, <span class="string">&quot;parser can only be used once&quot;</span>);
<span class="self">self</span>.parser().reset();
<span class="kw">let </span><span class="kw-2">mut </span>concat = ast::Concat { span: <span class="self">self</span>.span(), asts: <span class="macro">vec!</span>[] };
<span class="kw">loop </span>{
<span class="self">self</span>.bump_space();
<span class="kw">if </span><span class="self">self</span>.is_eof() {
<span class="kw">break</span>;
}
<span class="kw">match </span><span class="self">self</span>.char() {
<span class="string">&#39;(&#39; </span>=&gt; concat = <span class="self">self</span>.push_group(concat)<span class="question-mark">?</span>,
<span class="string">&#39;)&#39; </span>=&gt; concat = <span class="self">self</span>.pop_group(concat)<span class="question-mark">?</span>,
<span class="string">&#39;|&#39; </span>=&gt; concat = <span class="self">self</span>.push_alternate(concat)<span class="question-mark">?</span>,
<span class="string">&#39;[&#39; </span>=&gt; {
<span class="kw">let </span>class = <span class="self">self</span>.parse_set_class()<span class="question-mark">?</span>;
concat.asts.push(Ast::Class(class));
}
<span class="string">&#39;?&#39; </span>=&gt; {
concat = <span class="self">self</span>.parse_uncounted_repetition(
concat,
ast::RepetitionKind::ZeroOrOne,
)<span class="question-mark">?</span>;
}
<span class="string">&#39;*&#39; </span>=&gt; {
concat = <span class="self">self</span>.parse_uncounted_repetition(
concat,
ast::RepetitionKind::ZeroOrMore,
)<span class="question-mark">?</span>;
}
<span class="string">&#39;+&#39; </span>=&gt; {
concat = <span class="self">self</span>.parse_uncounted_repetition(
concat,
ast::RepetitionKind::OneOrMore,
)<span class="question-mark">?</span>;
}
<span class="string">&#39;{&#39; </span>=&gt; {
concat = <span class="self">self</span>.parse_counted_repetition(concat)<span class="question-mark">?</span>;
}
<span class="kw">_ </span>=&gt; concat.asts.push(<span class="self">self</span>.parse_primitive()<span class="question-mark">?</span>.into_ast()),
}
}
<span class="kw">let </span>ast = <span class="self">self</span>.pop_group_end(concat)<span class="question-mark">?</span>;
NestLimiter::new(<span class="self">self</span>).check(<span class="kw-2">&amp;</span>ast)<span class="question-mark">?</span>;
<span class="prelude-val">Ok</span>(ast::WithComments {
ast,
comments: mem::replace(
<span class="kw-2">&amp;mut *</span><span class="self">self</span>.parser().comments.borrow_mut(),
<span class="macro">vec!</span>[],
),
})
}
<span class="doccomment">/// Parses an uncounted repetition operation. An uncounted repetition
/// operator includes ?, * and +, but does not include the {m,n} syntax.
/// The given `kind` should correspond to the operator observed by the
/// caller.
///
/// This assumes that the parser is currently positioned at the repetition
/// operator and advances the parser to the first character after the
/// operator. (Note that the operator may include a single additional `?`,
/// which makes the operator ungreedy.)
///
/// The caller should include the concatenation that is being built. The
/// concatenation returned includes the repetition operator applied to the
/// last expression in the given concatenation.
</span><span class="attribute">#[inline(never)]
</span><span class="kw">fn </span>parse_uncounted_repetition(
<span class="kw-2">&amp;</span><span class="self">self</span>,
<span class="kw-2">mut </span>concat: ast::Concat,
kind: ast::RepetitionKind,
) -&gt; <span class="prelude-ty">Result</span>&lt;ast::Concat&gt; {
<span class="macro">assert!</span>(
<span class="self">self</span>.char() == <span class="string">&#39;?&#39; </span>|| <span class="self">self</span>.char() == <span class="string">&#39;*&#39; </span>|| <span class="self">self</span>.char() == <span class="string">&#39;+&#39;
</span>);
<span class="kw">let </span>op_start = <span class="self">self</span>.pos();
<span class="kw">let </span>ast = <span class="kw">match </span>concat.asts.pop() {
<span class="prelude-val">Some</span>(ast) =&gt; ast,
<span class="prelude-val">None </span>=&gt; {
<span class="kw">return </span><span class="prelude-val">Err</span>(
<span class="self">self</span>.error(<span class="self">self</span>.span(), ast::ErrorKind::RepetitionMissing)
)
}
};
<span class="kw">match </span>ast {
Ast::Empty(<span class="kw">_</span>) | Ast::Flags(<span class="kw">_</span>) =&gt; {
<span class="kw">return </span><span class="prelude-val">Err</span>(
<span class="self">self</span>.error(<span class="self">self</span>.span(), ast::ErrorKind::RepetitionMissing)
)
}
<span class="kw">_ </span>=&gt; {}
}
<span class="kw">let </span><span class="kw-2">mut </span>greedy = <span class="bool-val">true</span>;
<span class="kw">if </span><span class="self">self</span>.bump() &amp;&amp; <span class="self">self</span>.char() == <span class="string">&#39;?&#39; </span>{
greedy = <span class="bool-val">false</span>;
<span class="self">self</span>.bump();
}
concat.asts.push(Ast::Repetition(ast::Repetition {
span: ast.span().with_end(<span class="self">self</span>.pos()),
op: ast::RepetitionOp {
span: Span::new(op_start, <span class="self">self</span>.pos()),
kind,
},
greedy,
ast: Box::new(ast),
}));
<span class="prelude-val">Ok</span>(concat)
}
<span class="doccomment">/// Parses a counted repetition operation. A counted repetition operator
/// corresponds to the {m,n} syntax, and does not include the ?, * or +
/// operators.
///
/// This assumes that the parser is currently positioned at the opening `{`
/// and advances the parser to the first character after the operator.
/// (Note that the operator may include a single additional `?`, which
/// makes the operator ungreedy.)
///
/// The caller should include the concatenation that is being built. The
/// concatenation returned includes the repetition operator applied to the
/// last expression in the given concatenation.
</span><span class="attribute">#[inline(never)]
</span><span class="kw">fn </span>parse_counted_repetition(
<span class="kw-2">&amp;</span><span class="self">self</span>,
<span class="kw-2">mut </span>concat: ast::Concat,
) -&gt; <span class="prelude-ty">Result</span>&lt;ast::Concat&gt; {
<span class="macro">assert!</span>(<span class="self">self</span>.char() == <span class="string">&#39;{&#39;</span>);
<span class="kw">let </span>start = <span class="self">self</span>.pos();
<span class="kw">let </span>ast = <span class="kw">match </span>concat.asts.pop() {
<span class="prelude-val">Some</span>(ast) =&gt; ast,
<span class="prelude-val">None </span>=&gt; {
<span class="kw">return </span><span class="prelude-val">Err</span>(
<span class="self">self</span>.error(<span class="self">self</span>.span(), ast::ErrorKind::RepetitionMissing)
)
}
};
<span class="kw">match </span>ast {
Ast::Empty(<span class="kw">_</span>) | Ast::Flags(<span class="kw">_</span>) =&gt; {
<span class="kw">return </span><span class="prelude-val">Err</span>(
<span class="self">self</span>.error(<span class="self">self</span>.span(), ast::ErrorKind::RepetitionMissing)
)
}
<span class="kw">_ </span>=&gt; {}
}
<span class="kw">if </span>!<span class="self">self</span>.bump_and_bump_space() {
<span class="kw">return </span><span class="prelude-val">Err</span>(<span class="self">self</span>.error(
Span::new(start, <span class="self">self</span>.pos()),
ast::ErrorKind::RepetitionCountUnclosed,
));
}
<span class="kw">let </span>count_start = specialize_err(
<span class="self">self</span>.parse_decimal(),
ast::ErrorKind::DecimalEmpty,
ast::ErrorKind::RepetitionCountDecimalEmpty,
)<span class="question-mark">?</span>;
<span class="kw">let </span><span class="kw-2">mut </span>range = ast::RepetitionRange::Exactly(count_start);
<span class="kw">if </span><span class="self">self</span>.is_eof() {
<span class="kw">return </span><span class="prelude-val">Err</span>(<span class="self">self</span>.error(
Span::new(start, <span class="self">self</span>.pos()),
ast::ErrorKind::RepetitionCountUnclosed,
));
}
<span class="kw">if </span><span class="self">self</span>.char() == <span class="string">&#39;,&#39; </span>{
<span class="kw">if </span>!<span class="self">self</span>.bump_and_bump_space() {
<span class="kw">return </span><span class="prelude-val">Err</span>(<span class="self">self</span>.error(
Span::new(start, <span class="self">self</span>.pos()),
ast::ErrorKind::RepetitionCountUnclosed,
));
}
<span class="kw">if </span><span class="self">self</span>.char() != <span class="string">&#39;}&#39; </span>{
<span class="kw">let </span>count_end = specialize_err(
<span class="self">self</span>.parse_decimal(),
ast::ErrorKind::DecimalEmpty,
ast::ErrorKind::RepetitionCountDecimalEmpty,
)<span class="question-mark">?</span>;
range = ast::RepetitionRange::Bounded(count_start, count_end);
} <span class="kw">else </span>{
range = ast::RepetitionRange::AtLeast(count_start);
}
}
<span class="kw">if </span><span class="self">self</span>.is_eof() || <span class="self">self</span>.char() != <span class="string">&#39;}&#39; </span>{
<span class="kw">return </span><span class="prelude-val">Err</span>(<span class="self">self</span>.error(
Span::new(start, <span class="self">self</span>.pos()),
ast::ErrorKind::RepetitionCountUnclosed,
));
}
<span class="kw">let </span><span class="kw-2">mut </span>greedy = <span class="bool-val">true</span>;
<span class="kw">if </span><span class="self">self</span>.bump_and_bump_space() &amp;&amp; <span class="self">self</span>.char() == <span class="string">&#39;?&#39; </span>{
greedy = <span class="bool-val">false</span>;
<span class="self">self</span>.bump();
}
<span class="kw">let </span>op_span = Span::new(start, <span class="self">self</span>.pos());
<span class="kw">if </span>!range.is_valid() {
<span class="kw">return </span><span class="prelude-val">Err</span>(
<span class="self">self</span>.error(op_span, ast::ErrorKind::RepetitionCountInvalid)
);
}
concat.asts.push(Ast::Repetition(ast::Repetition {
span: ast.span().with_end(<span class="self">self</span>.pos()),
op: ast::RepetitionOp {
span: op_span,
kind: ast::RepetitionKind::Range(range),
},
greedy,
ast: Box::new(ast),
}));
<span class="prelude-val">Ok</span>(concat)
}
<span class="doccomment">/// Parse a group (which contains a sub-expression) or a set of flags.
///
/// If a group was found, then it is returned with an empty AST. If a set
/// of flags is found, then that set is returned.
///
/// The parser should be positioned at the opening parenthesis.
///
/// This advances the parser to the character before the start of the
/// sub-expression (in the case of a group) or to the closing parenthesis
/// immediately following the set of flags.
///
/// # Errors
///
/// If flags are given and incorrectly specified, then a corresponding
/// error is returned.
///
/// If a capture name is given and it is incorrectly specified, then a
/// corresponding error is returned.
</span><span class="attribute">#[inline(never)]
</span><span class="kw">fn </span>parse_group(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="prelude-ty">Result</span>&lt;Either&lt;ast::SetFlags, ast::Group&gt;&gt; {
<span class="macro">assert_eq!</span>(<span class="self">self</span>.char(), <span class="string">&#39;(&#39;</span>);
<span class="kw">let </span>open_span = <span class="self">self</span>.span_char();
<span class="self">self</span>.bump();
<span class="self">self</span>.bump_space();
<span class="kw">if </span><span class="self">self</span>.is_lookaround_prefix() {
<span class="kw">return </span><span class="prelude-val">Err</span>(<span class="self">self</span>.error(
Span::new(open_span.start, <span class="self">self</span>.span().end),
ast::ErrorKind::UnsupportedLookAround,
));
}
<span class="kw">let </span>inner_span = <span class="self">self</span>.span();
<span class="kw">let </span><span class="kw-2">mut </span>starts_with_p = <span class="bool-val">true</span>;
<span class="kw">if </span><span class="self">self</span>.bump_if(<span class="string">&quot;?P&lt;&quot;</span>) || {
starts_with_p = <span class="bool-val">false</span>;
<span class="self">self</span>.bump_if(<span class="string">&quot;?&lt;&quot;</span>)
} {
<span class="kw">let </span>capture_index = <span class="self">self</span>.next_capture_index(open_span)<span class="question-mark">?</span>;
<span class="kw">let </span>name = <span class="self">self</span>.parse_capture_name(capture_index)<span class="question-mark">?</span>;
<span class="prelude-val">Ok</span>(Either::Right(ast::Group {
span: open_span,
kind: ast::GroupKind::CaptureName { starts_with_p, name },
ast: Box::new(Ast::Empty(<span class="self">self</span>.span())),
}))
} <span class="kw">else if </span><span class="self">self</span>.bump_if(<span class="string">&quot;?&quot;</span>) {
<span class="kw">if </span><span class="self">self</span>.is_eof() {
<span class="kw">return </span><span class="prelude-val">Err</span>(
<span class="self">self</span>.error(open_span, ast::ErrorKind::GroupUnclosed)
);
}
<span class="kw">let </span>flags = <span class="self">self</span>.parse_flags()<span class="question-mark">?</span>;
<span class="kw">let </span>char_end = <span class="self">self</span>.char();
<span class="self">self</span>.bump();
<span class="kw">if </span>char_end == <span class="string">&#39;)&#39; </span>{
<span class="comment">// We don&#39;t allow empty flags, e.g., `(?)`. We instead
// interpret it as a repetition operator missing its argument.
</span><span class="kw">if </span>flags.items.is_empty() {
<span class="kw">return </span><span class="prelude-val">Err</span>(<span class="self">self</span>.error(
inner_span,
ast::ErrorKind::RepetitionMissing,
));
}
<span class="prelude-val">Ok</span>(Either::Left(ast::SetFlags {
span: Span { end: <span class="self">self</span>.pos(), ..open_span },
flags,
}))
} <span class="kw">else </span>{
<span class="macro">assert_eq!</span>(char_end, <span class="string">&#39;:&#39;</span>);
<span class="prelude-val">Ok</span>(Either::Right(ast::Group {
span: open_span,
kind: ast::GroupKind::NonCapturing(flags),
ast: Box::new(Ast::Empty(<span class="self">self</span>.span())),
}))
}
} <span class="kw">else </span>{
<span class="kw">let </span>capture_index = <span class="self">self</span>.next_capture_index(open_span)<span class="question-mark">?</span>;
<span class="prelude-val">Ok</span>(Either::Right(ast::Group {
span: open_span,
kind: ast::GroupKind::CaptureIndex(capture_index),
ast: Box::new(Ast::Empty(<span class="self">self</span>.span())),
}))
}
}
<span class="doccomment">/// Parses a capture group name. Assumes that the parser is positioned at
/// the first character in the name following the opening `&lt;` (and may
/// possibly be EOF). This advances the parser to the first character
/// following the closing `&gt;`.
///
/// The caller must provide the capture index of the group for this name.
</span><span class="attribute">#[inline(never)]
</span><span class="kw">fn </span>parse_capture_name(
<span class="kw-2">&amp;</span><span class="self">self</span>,
capture_index: u32,
) -&gt; <span class="prelude-ty">Result</span>&lt;ast::CaptureName&gt; {
<span class="kw">if </span><span class="self">self</span>.is_eof() {
<span class="kw">return </span><span class="prelude-val">Err</span>(<span class="self">self
</span>.error(<span class="self">self</span>.span(), ast::ErrorKind::GroupNameUnexpectedEof));
}
<span class="kw">let </span>start = <span class="self">self</span>.pos();
<span class="kw">loop </span>{
<span class="kw">if </span><span class="self">self</span>.char() == <span class="string">&#39;&gt;&#39; </span>{
<span class="kw">break</span>;
}
<span class="kw">if </span>!is_capture_char(<span class="self">self</span>.char(), <span class="self">self</span>.pos() == start) {
<span class="kw">return </span><span class="prelude-val">Err</span>(<span class="self">self</span>.error(
<span class="self">self</span>.span_char(),
ast::ErrorKind::GroupNameInvalid,
));
}
<span class="kw">if </span>!<span class="self">self</span>.bump() {
<span class="kw">break</span>;
}
}
<span class="kw">let </span>end = <span class="self">self</span>.pos();
<span class="kw">if </span><span class="self">self</span>.is_eof() {
<span class="kw">return </span><span class="prelude-val">Err</span>(<span class="self">self
</span>.error(<span class="self">self</span>.span(), ast::ErrorKind::GroupNameUnexpectedEof));
}
<span class="macro">assert_eq!</span>(<span class="self">self</span>.char(), <span class="string">&#39;&gt;&#39;</span>);
<span class="self">self</span>.bump();
<span class="kw">let </span>name = <span class="kw-2">&amp;</span><span class="self">self</span>.pattern()[start.offset..end.offset];
<span class="kw">if </span>name.is_empty() {
<span class="kw">return </span><span class="prelude-val">Err</span>(<span class="self">self</span>.error(
Span::new(start, start),
ast::ErrorKind::GroupNameEmpty,
));
}
<span class="kw">let </span>capname = ast::CaptureName {
span: Span::new(start, end),
name: name.to_string(),
index: capture_index,
};
<span class="self">self</span>.add_capture_name(<span class="kw-2">&amp;</span>capname)<span class="question-mark">?</span>;
<span class="prelude-val">Ok</span>(capname)
}
<span class="doccomment">/// Parse a sequence of flags starting at the current character.
///
/// This advances the parser to the character immediately following the
/// flags, which is guaranteed to be either `:` or `)`.
///
/// # Errors
///
/// If any flags are duplicated, then an error is returned.
///
/// If the negation operator is used more than once, then an error is
/// returned.
///
/// If no flags could be found or if the negation operation is not followed
/// by any flags, then an error is returned.
</span><span class="attribute">#[inline(never)]
</span><span class="kw">fn </span>parse_flags(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="prelude-ty">Result</span>&lt;ast::Flags&gt; {
<span class="kw">let </span><span class="kw-2">mut </span>flags = ast::Flags { span: <span class="self">self</span>.span(), items: <span class="macro">vec!</span>[] };
<span class="kw">let </span><span class="kw-2">mut </span>last_was_negation = <span class="prelude-val">None</span>;
<span class="kw">while </span><span class="self">self</span>.char() != <span class="string">&#39;:&#39; </span>&amp;&amp; <span class="self">self</span>.char() != <span class="string">&#39;)&#39; </span>{
<span class="kw">if </span><span class="self">self</span>.char() == <span class="string">&#39;-&#39; </span>{
last_was_negation = <span class="prelude-val">Some</span>(<span class="self">self</span>.span_char());
<span class="kw">let </span>item = ast::FlagsItem {
span: <span class="self">self</span>.span_char(),
kind: ast::FlagsItemKind::Negation,
};
<span class="kw">if let </span><span class="prelude-val">Some</span>(i) = flags.add_item(item) {
<span class="kw">return </span><span class="prelude-val">Err</span>(<span class="self">self</span>.error(
<span class="self">self</span>.span_char(),
ast::ErrorKind::FlagRepeatedNegation {
original: flags.items[i].span,
},
));
}
} <span class="kw">else </span>{
last_was_negation = <span class="prelude-val">None</span>;
<span class="kw">let </span>item = ast::FlagsItem {
span: <span class="self">self</span>.span_char(),
kind: ast::FlagsItemKind::Flag(<span class="self">self</span>.parse_flag()<span class="question-mark">?</span>),
};
<span class="kw">if let </span><span class="prelude-val">Some</span>(i) = flags.add_item(item) {
<span class="kw">return </span><span class="prelude-val">Err</span>(<span class="self">self</span>.error(
<span class="self">self</span>.span_char(),
ast::ErrorKind::FlagDuplicate {
original: flags.items[i].span,
},
));
}
}
<span class="kw">if </span>!<span class="self">self</span>.bump() {
<span class="kw">return </span><span class="prelude-val">Err</span>(
<span class="self">self</span>.error(<span class="self">self</span>.span(), ast::ErrorKind::FlagUnexpectedEof)
);
}
}
<span class="kw">if let </span><span class="prelude-val">Some</span>(span) = last_was_negation {
<span class="kw">return </span><span class="prelude-val">Err</span>(<span class="self">self</span>.error(span, ast::ErrorKind::FlagDanglingNegation));
}
flags.span.end = <span class="self">self</span>.pos();
<span class="prelude-val">Ok</span>(flags)
}
<span class="doccomment">/// Parse the current character as a flag. Do not advance the parser.
///
/// # Errors
///
/// If the flag is not recognized, then an error is returned.
</span><span class="attribute">#[inline(never)]
</span><span class="kw">fn </span>parse_flag(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="prelude-ty">Result</span>&lt;ast::Flag&gt; {
<span class="kw">match </span><span class="self">self</span>.char() {
<span class="string">&#39;i&#39; </span>=&gt; <span class="prelude-val">Ok</span>(ast::Flag::CaseInsensitive),
<span class="string">&#39;m&#39; </span>=&gt; <span class="prelude-val">Ok</span>(ast::Flag::MultiLine),
<span class="string">&#39;s&#39; </span>=&gt; <span class="prelude-val">Ok</span>(ast::Flag::DotMatchesNewLine),
<span class="string">&#39;U&#39; </span>=&gt; <span class="prelude-val">Ok</span>(ast::Flag::SwapGreed),
<span class="string">&#39;u&#39; </span>=&gt; <span class="prelude-val">Ok</span>(ast::Flag::Unicode),
<span class="string">&#39;R&#39; </span>=&gt; <span class="prelude-val">Ok</span>(ast::Flag::CRLF),
<span class="string">&#39;x&#39; </span>=&gt; <span class="prelude-val">Ok</span>(ast::Flag::IgnoreWhitespace),
<span class="kw">_ </span>=&gt; {
<span class="prelude-val">Err</span>(<span class="self">self
</span>.error(<span class="self">self</span>.span_char(), ast::ErrorKind::FlagUnrecognized))
}
}
}
<span class="doccomment">/// Parse a primitive AST. e.g., A literal, non-set character class or
/// assertion.
///
/// This assumes that the parser expects a primitive at the current
/// location. i.e., All other non-primitive cases have been handled.
/// For example, if the parser&#39;s position is at `|`, then `|` will be
/// treated as a literal (e.g., inside a character class).
///
/// This advances the parser to the first character immediately following
/// the primitive.
</span><span class="kw">fn </span>parse_primitive(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="prelude-ty">Result</span>&lt;Primitive&gt; {
<span class="kw">match </span><span class="self">self</span>.char() {
<span class="string">&#39;\\&#39; </span>=&gt; <span class="self">self</span>.parse_escape(),
<span class="string">&#39;.&#39; </span>=&gt; {
<span class="kw">let </span>ast = Primitive::Dot(<span class="self">self</span>.span_char());
<span class="self">self</span>.bump();
<span class="prelude-val">Ok</span>(ast)
}
<span class="string">&#39;^&#39; </span>=&gt; {
<span class="kw">let </span>ast = Primitive::Assertion(ast::Assertion {
span: <span class="self">self</span>.span_char(),
kind: ast::AssertionKind::StartLine,
});
<span class="self">self</span>.bump();
<span class="prelude-val">Ok</span>(ast)
}
<span class="string">&#39;$&#39; </span>=&gt; {
<span class="kw">let </span>ast = Primitive::Assertion(ast::Assertion {
span: <span class="self">self</span>.span_char(),
kind: ast::AssertionKind::EndLine,
});
<span class="self">self</span>.bump();
<span class="prelude-val">Ok</span>(ast)
}
c =&gt; {
<span class="kw">let </span>ast = Primitive::Literal(ast::Literal {
span: <span class="self">self</span>.span_char(),
kind: ast::LiteralKind::Verbatim,
c,
});
<span class="self">self</span>.bump();
<span class="prelude-val">Ok</span>(ast)
}
}
}
<span class="doccomment">/// Parse an escape sequence as a primitive AST.
///
/// This assumes the parser is positioned at the start of the escape
/// sequence, i.e., `\`. It advances the parser to the first position
/// immediately following the escape sequence.
</span><span class="attribute">#[inline(never)]
</span><span class="kw">fn </span>parse_escape(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="prelude-ty">Result</span>&lt;Primitive&gt; {
<span class="macro">assert_eq!</span>(<span class="self">self</span>.char(), <span class="string">&#39;\\&#39;</span>);
<span class="kw">let </span>start = <span class="self">self</span>.pos();
<span class="kw">if </span>!<span class="self">self</span>.bump() {
<span class="kw">return </span><span class="prelude-val">Err</span>(<span class="self">self</span>.error(
Span::new(start, <span class="self">self</span>.pos()),
ast::ErrorKind::EscapeUnexpectedEof,
));
}
<span class="kw">let </span>c = <span class="self">self</span>.char();
<span class="comment">// Put some of the more complicated routines into helpers.
</span><span class="kw">match </span>c {
<span class="string">&#39;0&#39;</span>..=<span class="string">&#39;7&#39; </span>=&gt; {
<span class="kw">if </span>!<span class="self">self</span>.parser().octal {
<span class="kw">return </span><span class="prelude-val">Err</span>(<span class="self">self</span>.error(
Span::new(start, <span class="self">self</span>.span_char().end),
ast::ErrorKind::UnsupportedBackreference,
));
}
<span class="kw">let </span><span class="kw-2">mut </span>lit = <span class="self">self</span>.parse_octal();
lit.span.start = start;
<span class="kw">return </span><span class="prelude-val">Ok</span>(Primitive::Literal(lit));
}
<span class="string">&#39;8&#39;</span>..=<span class="string">&#39;9&#39; </span><span class="kw">if </span>!<span class="self">self</span>.parser().octal =&gt; {
<span class="kw">return </span><span class="prelude-val">Err</span>(<span class="self">self</span>.error(
Span::new(start, <span class="self">self</span>.span_char().end),
ast::ErrorKind::UnsupportedBackreference,
));
}
<span class="string">&#39;x&#39; </span>| <span class="string">&#39;u&#39; </span>| <span class="string">&#39;U&#39; </span>=&gt; {
<span class="kw">let </span><span class="kw-2">mut </span>lit = <span class="self">self</span>.parse_hex()<span class="question-mark">?</span>;
lit.span.start = start;
<span class="kw">return </span><span class="prelude-val">Ok</span>(Primitive::Literal(lit));
}
<span class="string">&#39;p&#39; </span>| <span class="string">&#39;P&#39; </span>=&gt; {
<span class="kw">let </span><span class="kw-2">mut </span>cls = <span class="self">self</span>.parse_unicode_class()<span class="question-mark">?</span>;
cls.span.start = start;
<span class="kw">return </span><span class="prelude-val">Ok</span>(Primitive::Unicode(cls));
}
<span class="string">&#39;d&#39; </span>| <span class="string">&#39;s&#39; </span>| <span class="string">&#39;w&#39; </span>| <span class="string">&#39;D&#39; </span>| <span class="string">&#39;S&#39; </span>| <span class="string">&#39;W&#39; </span>=&gt; {
<span class="kw">let </span><span class="kw-2">mut </span>cls = <span class="self">self</span>.parse_perl_class();
cls.span.start = start;
<span class="kw">return </span><span class="prelude-val">Ok</span>(Primitive::Perl(cls));
}
<span class="kw">_ </span>=&gt; {}
}
<span class="comment">// Handle all of the one letter sequences inline.
</span><span class="self">self</span>.bump();
<span class="kw">let </span>span = Span::new(start, <span class="self">self</span>.pos());
<span class="kw">if </span>is_meta_character(c) {
<span class="kw">return </span><span class="prelude-val">Ok</span>(Primitive::Literal(ast::Literal {
span,
kind: ast::LiteralKind::Meta,
c,
}));
}
<span class="kw">if </span>is_escapeable_character(c) {
<span class="kw">return </span><span class="prelude-val">Ok</span>(Primitive::Literal(ast::Literal {
span,
kind: ast::LiteralKind::Superfluous,
c,
}));
}
<span class="kw">let </span>special = |kind, c| {
<span class="prelude-val">Ok</span>(Primitive::Literal(ast::Literal {
span,
kind: ast::LiteralKind::Special(kind),
c,
}))
};
<span class="kw">match </span>c {
<span class="string">&#39;a&#39; </span>=&gt; special(ast::SpecialLiteralKind::Bell, <span class="string">&#39;\x07&#39;</span>),
<span class="string">&#39;f&#39; </span>=&gt; special(ast::SpecialLiteralKind::FormFeed, <span class="string">&#39;\x0C&#39;</span>),
<span class="string">&#39;t&#39; </span>=&gt; special(ast::SpecialLiteralKind::Tab, <span class="string">&#39;\t&#39;</span>),
<span class="string">&#39;n&#39; </span>=&gt; special(ast::SpecialLiteralKind::LineFeed, <span class="string">&#39;\n&#39;</span>),
<span class="string">&#39;r&#39; </span>=&gt; special(ast::SpecialLiteralKind::CarriageReturn, <span class="string">&#39;\r&#39;</span>),
<span class="string">&#39;v&#39; </span>=&gt; special(ast::SpecialLiteralKind::VerticalTab, <span class="string">&#39;\x0B&#39;</span>),
<span class="string">&#39;A&#39; </span>=&gt; <span class="prelude-val">Ok</span>(Primitive::Assertion(ast::Assertion {
span,
kind: ast::AssertionKind::StartText,
})),
<span class="string">&#39;z&#39; </span>=&gt; <span class="prelude-val">Ok</span>(Primitive::Assertion(ast::Assertion {
span,
kind: ast::AssertionKind::EndText,
})),
<span class="string">&#39;b&#39; </span>=&gt; <span class="prelude-val">Ok</span>(Primitive::Assertion(ast::Assertion {
span,
kind: ast::AssertionKind::WordBoundary,
})),
<span class="string">&#39;B&#39; </span>=&gt; <span class="prelude-val">Ok</span>(Primitive::Assertion(ast::Assertion {
span,
kind: ast::AssertionKind::NotWordBoundary,
})),
<span class="kw">_ </span>=&gt; <span class="prelude-val">Err</span>(<span class="self">self</span>.error(span, ast::ErrorKind::EscapeUnrecognized)),
}
}
<span class="doccomment">/// Parse an octal representation of a Unicode codepoint up to 3 digits
/// long. This expects the parser to be positioned at the first octal
/// digit and advances the parser to the first character immediately
/// following the octal number. This also assumes that parsing octal
/// escapes is enabled.
///
/// Assuming the preconditions are met, this routine can never fail.
</span><span class="attribute">#[inline(never)]
</span><span class="kw">fn </span>parse_octal(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; ast::Literal {
<span class="macro">assert!</span>(<span class="self">self</span>.parser().octal);
<span class="macro">assert!</span>(<span class="string">&#39;0&#39; </span>&lt;= <span class="self">self</span>.char() &amp;&amp; <span class="self">self</span>.char() &lt;= <span class="string">&#39;7&#39;</span>);
<span class="kw">let </span>start = <span class="self">self</span>.pos();
<span class="comment">// Parse up to two more digits.
</span><span class="kw">while </span><span class="self">self</span>.bump()
&amp;&amp; <span class="string">&#39;0&#39; </span>&lt;= <span class="self">self</span>.char()
&amp;&amp; <span class="self">self</span>.char() &lt;= <span class="string">&#39;7&#39;
</span>&amp;&amp; <span class="self">self</span>.pos().offset - start.offset &lt;= <span class="number">2
</span>{}
<span class="kw">let </span>end = <span class="self">self</span>.pos();
<span class="kw">let </span>octal = <span class="kw-2">&amp;</span><span class="self">self</span>.pattern()[start.offset..end.offset];
<span class="comment">// Parsing the octal should never fail since the above guarantees a
// valid number.
</span><span class="kw">let </span>codepoint =
u32::from_str_radix(octal, <span class="number">8</span>).expect(<span class="string">&quot;valid octal number&quot;</span>);
<span class="comment">// The max value for 3 digit octal is 0777 = 511 and [0, 511] has no
// invalid Unicode scalar values.
</span><span class="kw">let </span>c = char::from_u32(codepoint).expect(<span class="string">&quot;Unicode scalar value&quot;</span>);
ast::Literal {
span: Span::new(start, end),
kind: ast::LiteralKind::Octal,
c,
}
}
<span class="doccomment">/// Parse a hex representation of a Unicode codepoint. This handles both
/// hex notations, i.e., `\xFF` and `\x{FFFF}`. This expects the parser to
/// be positioned at the `x`, `u` or `U` prefix. The parser is advanced to
/// the first character immediately following the hexadecimal literal.
</span><span class="attribute">#[inline(never)]
</span><span class="kw">fn </span>parse_hex(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="prelude-ty">Result</span>&lt;ast::Literal&gt; {
<span class="macro">assert!</span>(
<span class="self">self</span>.char() == <span class="string">&#39;x&#39; </span>|| <span class="self">self</span>.char() == <span class="string">&#39;u&#39; </span>|| <span class="self">self</span>.char() == <span class="string">&#39;U&#39;
</span>);
<span class="kw">let </span>hex_kind = <span class="kw">match </span><span class="self">self</span>.char() {
<span class="string">&#39;x&#39; </span>=&gt; ast::HexLiteralKind::X,
<span class="string">&#39;u&#39; </span>=&gt; ast::HexLiteralKind::UnicodeShort,
<span class="kw">_ </span>=&gt; ast::HexLiteralKind::UnicodeLong,
};
<span class="kw">if </span>!<span class="self">self</span>.bump_and_bump_space() {
<span class="kw">return </span><span class="prelude-val">Err</span>(
<span class="self">self</span>.error(<span class="self">self</span>.span(), ast::ErrorKind::EscapeUnexpectedEof)
);
}
<span class="kw">if </span><span class="self">self</span>.char() == <span class="string">&#39;{&#39; </span>{
<span class="self">self</span>.parse_hex_brace(hex_kind)
} <span class="kw">else </span>{
<span class="self">self</span>.parse_hex_digits(hex_kind)
}
}
<span class="doccomment">/// Parse an N-digit hex representation of a Unicode codepoint. This
/// expects the parser to be positioned at the first digit and will advance
/// the parser to the first character immediately following the escape
/// sequence.
///
/// The number of digits given must be 2 (for `\xNN`), 4 (for `\uNNNN`)
/// or 8 (for `\UNNNNNNNN`).
</span><span class="attribute">#[inline(never)]
</span><span class="kw">fn </span>parse_hex_digits(
<span class="kw-2">&amp;</span><span class="self">self</span>,
kind: ast::HexLiteralKind,
) -&gt; <span class="prelude-ty">Result</span>&lt;ast::Literal&gt; {
<span class="kw">let </span><span class="kw-2">mut </span>scratch = <span class="self">self</span>.parser().scratch.borrow_mut();
scratch.clear();
<span class="kw">let </span>start = <span class="self">self</span>.pos();
<span class="kw">for </span>i <span class="kw">in </span><span class="number">0</span>..kind.digits() {
<span class="kw">if </span>i &gt; <span class="number">0 </span>&amp;&amp; !<span class="self">self</span>.bump_and_bump_space() {
<span class="kw">return </span><span class="prelude-val">Err</span>(<span class="self">self
</span>.error(<span class="self">self</span>.span(), ast::ErrorKind::EscapeUnexpectedEof));
}
<span class="kw">if </span>!is_hex(<span class="self">self</span>.char()) {
<span class="kw">return </span><span class="prelude-val">Err</span>(<span class="self">self</span>.error(
<span class="self">self</span>.span_char(),
ast::ErrorKind::EscapeHexInvalidDigit,
));
}
scratch.push(<span class="self">self</span>.char());
}
<span class="comment">// The final bump just moves the parser past the literal, which may
// be EOF.
</span><span class="self">self</span>.bump_and_bump_space();
<span class="kw">let </span>end = <span class="self">self</span>.pos();
<span class="kw">let </span>hex = scratch.as_str();
<span class="kw">match </span>u32::from_str_radix(hex, <span class="number">16</span>).ok().and_then(char::from_u32) {
<span class="prelude-val">None </span>=&gt; <span class="prelude-val">Err</span>(<span class="self">self</span>.error(
Span::new(start, end),
ast::ErrorKind::EscapeHexInvalid,
)),
<span class="prelude-val">Some</span>(c) =&gt; <span class="prelude-val">Ok</span>(ast::Literal {
span: Span::new(start, end),
kind: ast::LiteralKind::HexFixed(kind),
c,
}),
}
}
<span class="doccomment">/// Parse a hex representation of any Unicode scalar value. This expects
/// the parser to be positioned at the opening brace `{` and will advance
/// the parser to the first character following the closing brace `}`.
</span><span class="attribute">#[inline(never)]
</span><span class="kw">fn </span>parse_hex_brace(
<span class="kw-2">&amp;</span><span class="self">self</span>,
kind: ast::HexLiteralKind,
) -&gt; <span class="prelude-ty">Result</span>&lt;ast::Literal&gt; {
<span class="kw">let </span><span class="kw-2">mut </span>scratch = <span class="self">self</span>.parser().scratch.borrow_mut();
scratch.clear();
<span class="kw">let </span>brace_pos = <span class="self">self</span>.pos();
<span class="kw">let </span>start = <span class="self">self</span>.span_char().end;
<span class="kw">while </span><span class="self">self</span>.bump_and_bump_space() &amp;&amp; <span class="self">self</span>.char() != <span class="string">&#39;}&#39; </span>{
<span class="kw">if </span>!is_hex(<span class="self">self</span>.char()) {
<span class="kw">return </span><span class="prelude-val">Err</span>(<span class="self">self</span>.error(
<span class="self">self</span>.span_char(),
ast::ErrorKind::EscapeHexInvalidDigit,
));
}
scratch.push(<span class="self">self</span>.char());
}
<span class="kw">if </span><span class="self">self</span>.is_eof() {
<span class="kw">return </span><span class="prelude-val">Err</span>(<span class="self">self</span>.error(
Span::new(brace_pos, <span class="self">self</span>.pos()),
ast::ErrorKind::EscapeUnexpectedEof,
));
}
<span class="kw">let </span>end = <span class="self">self</span>.pos();
<span class="kw">let </span>hex = scratch.as_str();
<span class="macro">assert_eq!</span>(<span class="self">self</span>.char(), <span class="string">&#39;}&#39;</span>);
<span class="self">self</span>.bump_and_bump_space();
<span class="kw">if </span>hex.is_empty() {
<span class="kw">return </span><span class="prelude-val">Err</span>(<span class="self">self</span>.error(
Span::new(brace_pos, <span class="self">self</span>.pos()),
ast::ErrorKind::EscapeHexEmpty,
));
}
<span class="kw">match </span>u32::from_str_radix(hex, <span class="number">16</span>).ok().and_then(char::from_u32) {
<span class="prelude-val">None </span>=&gt; <span class="prelude-val">Err</span>(<span class="self">self</span>.error(
Span::new(start, end),
ast::ErrorKind::EscapeHexInvalid,
)),
<span class="prelude-val">Some</span>(c) =&gt; <span class="prelude-val">Ok</span>(ast::Literal {
span: Span::new(start, <span class="self">self</span>.pos()),
kind: ast::LiteralKind::HexBrace(kind),
c,
}),
}
}
<span class="doccomment">/// Parse a decimal number into a u32 while trimming leading and trailing
/// whitespace.
///
/// This expects the parser to be positioned at the first position where
/// a decimal digit could occur. This will advance the parser to the byte
/// immediately following the last contiguous decimal digit.
///
/// If no decimal digit could be found or if there was a problem parsing
/// the complete set of digits into a u32, then an error is returned.
</span><span class="kw">fn </span>parse_decimal(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="prelude-ty">Result</span>&lt;u32&gt; {
<span class="kw">let </span><span class="kw-2">mut </span>scratch = <span class="self">self</span>.parser().scratch.borrow_mut();
scratch.clear();
<span class="kw">while </span>!<span class="self">self</span>.is_eof() &amp;&amp; <span class="self">self</span>.char().is_whitespace() {
<span class="self">self</span>.bump();
}
<span class="kw">let </span>start = <span class="self">self</span>.pos();
<span class="kw">while </span>!<span class="self">self</span>.is_eof() &amp;&amp; <span class="string">&#39;0&#39; </span>&lt;= <span class="self">self</span>.char() &amp;&amp; <span class="self">self</span>.char() &lt;= <span class="string">&#39;9&#39; </span>{
scratch.push(<span class="self">self</span>.char());
<span class="self">self</span>.bump_and_bump_space();
}
<span class="kw">let </span>span = Span::new(start, <span class="self">self</span>.pos());
<span class="kw">while </span>!<span class="self">self</span>.is_eof() &amp;&amp; <span class="self">self</span>.char().is_whitespace() {
<span class="self">self</span>.bump_and_bump_space();
}
<span class="kw">let </span>digits = scratch.as_str();
<span class="kw">if </span>digits.is_empty() {
<span class="kw">return </span><span class="prelude-val">Err</span>(<span class="self">self</span>.error(span, ast::ErrorKind::DecimalEmpty));
}
<span class="kw">match </span>u32::from_str_radix(digits, <span class="number">10</span>).ok() {
<span class="prelude-val">Some</span>(n) =&gt; <span class="prelude-val">Ok</span>(n),
<span class="prelude-val">None </span>=&gt; <span class="prelude-val">Err</span>(<span class="self">self</span>.error(span, ast::ErrorKind::DecimalInvalid)),
}
}
<span class="doccomment">/// Parse a standard character class consisting primarily of characters or
/// character ranges, but can also contain nested character classes of
/// any type (sans `.`).
///
/// This assumes the parser is positioned at the opening `[`. If parsing
/// is successful, then the parser is advanced to the position immediately
/// following the closing `]`.
</span><span class="attribute">#[inline(never)]
</span><span class="kw">fn </span>parse_set_class(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="prelude-ty">Result</span>&lt;ast::Class&gt; {
<span class="macro">assert_eq!</span>(<span class="self">self</span>.char(), <span class="string">&#39;[&#39;</span>);
<span class="kw">let </span><span class="kw-2">mut </span>union =
ast::ClassSetUnion { span: <span class="self">self</span>.span(), items: <span class="macro">vec!</span>[] };
<span class="kw">loop </span>{
<span class="self">self</span>.bump_space();
<span class="kw">if </span><span class="self">self</span>.is_eof() {
<span class="kw">return </span><span class="prelude-val">Err</span>(<span class="self">self</span>.unclosed_class_error());
}
<span class="kw">match </span><span class="self">self</span>.char() {
<span class="string">&#39;[&#39; </span>=&gt; {
<span class="comment">// If we&#39;ve already parsed the opening bracket, then
// attempt to treat this as the beginning of an ASCII
// class. If ASCII class parsing fails, then the parser
// backs up to `[`.
</span><span class="kw">if </span>!<span class="self">self</span>.parser().stack_class.borrow().is_empty() {
<span class="kw">if let </span><span class="prelude-val">Some</span>(cls) = <span class="self">self</span>.maybe_parse_ascii_class() {
union.push(ast::ClassSetItem::Ascii(cls));
<span class="kw">continue</span>;
}
}
union = <span class="self">self</span>.push_class_open(union)<span class="question-mark">?</span>;
}
<span class="string">&#39;]&#39; </span>=&gt; <span class="kw">match </span><span class="self">self</span>.pop_class(union)<span class="question-mark">? </span>{
Either::Left(nested_union) =&gt; {
union = nested_union;
}
Either::Right(class) =&gt; <span class="kw">return </span><span class="prelude-val">Ok</span>(class),
},
<span class="string">&#39;&amp;&#39; </span><span class="kw">if </span><span class="self">self</span>.peek() == <span class="prelude-val">Some</span>(<span class="string">&#39;&amp;&#39;</span>) =&gt; {
<span class="macro">assert!</span>(<span class="self">self</span>.bump_if(<span class="string">&quot;&amp;&amp;&quot;</span>));
union = <span class="self">self</span>.push_class_op(
ast::ClassSetBinaryOpKind::Intersection,
union,
);
}
<span class="string">&#39;-&#39; </span><span class="kw">if </span><span class="self">self</span>.peek() == <span class="prelude-val">Some</span>(<span class="string">&#39;-&#39;</span>) =&gt; {
<span class="macro">assert!</span>(<span class="self">self</span>.bump_if(<span class="string">&quot;--&quot;</span>));
union = <span class="self">self</span>.push_class_op(
ast::ClassSetBinaryOpKind::Difference,
union,
);
}
<span class="string">&#39;~&#39; </span><span class="kw">if </span><span class="self">self</span>.peek() == <span class="prelude-val">Some</span>(<span class="string">&#39;~&#39;</span>) =&gt; {
<span class="macro">assert!</span>(<span class="self">self</span>.bump_if(<span class="string">&quot;~~&quot;</span>));
union = <span class="self">self</span>.push_class_op(
ast::ClassSetBinaryOpKind::SymmetricDifference,
union,
);
}
<span class="kw">_ </span>=&gt; {
union.push(<span class="self">self</span>.parse_set_class_range()<span class="question-mark">?</span>);
}
}
}
}
<span class="doccomment">/// Parse a single primitive item in a character class set. The item to
/// be parsed can either be one of a simple literal character, a range
/// between two simple literal characters or a &quot;primitive&quot; character
/// class like \w or \p{Greek}.
///
/// If an invalid escape is found, or if a character class is found where
/// a simple literal is expected (e.g., in a range), then an error is
/// returned.
</span><span class="attribute">#[inline(never)]
</span><span class="kw">fn </span>parse_set_class_range(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="prelude-ty">Result</span>&lt;ast::ClassSetItem&gt; {
<span class="kw">let </span>prim1 = <span class="self">self</span>.parse_set_class_item()<span class="question-mark">?</span>;
<span class="self">self</span>.bump_space();
<span class="kw">if </span><span class="self">self</span>.is_eof() {
<span class="kw">return </span><span class="prelude-val">Err</span>(<span class="self">self</span>.unclosed_class_error());
}
<span class="comment">// If the next char isn&#39;t a `-`, then we don&#39;t have a range.
// There are two exceptions. If the char after a `-` is a `]`, then
// `-` is interpreted as a literal `-`. Alternatively, if the char
// after a `-` is a `-`, then `--` corresponds to a &quot;difference&quot;
// operation.
</span><span class="kw">if </span><span class="self">self</span>.char() != <span class="string">&#39;-&#39;
</span>|| <span class="self">self</span>.peek_space() == <span class="prelude-val">Some</span>(<span class="string">&#39;]&#39;</span>)
|| <span class="self">self</span>.peek_space() == <span class="prelude-val">Some</span>(<span class="string">&#39;-&#39;</span>)
{
<span class="kw">return </span>prim1.into_class_set_item(<span class="self">self</span>);
}
<span class="comment">// OK, now we&#39;re parsing a range, so bump past the `-` and parse the
// second half of the range.
</span><span class="kw">if </span>!<span class="self">self</span>.bump_and_bump_space() {
<span class="kw">return </span><span class="prelude-val">Err</span>(<span class="self">self</span>.unclosed_class_error());
}
<span class="kw">let </span>prim2 = <span class="self">self</span>.parse_set_class_item()<span class="question-mark">?</span>;
<span class="kw">let </span>range = ast::ClassSetRange {
span: Span::new(prim1.span().start, prim2.span().end),
start: prim1.into_class_literal(<span class="self">self</span>)<span class="question-mark">?</span>,
end: prim2.into_class_literal(<span class="self">self</span>)<span class="question-mark">?</span>,
};
<span class="kw">if </span>!range.is_valid() {
<span class="kw">return </span><span class="prelude-val">Err</span>(
<span class="self">self</span>.error(range.span, ast::ErrorKind::ClassRangeInvalid)
);
}
<span class="prelude-val">Ok</span>(ast::ClassSetItem::Range(range))
}
<span class="doccomment">/// Parse a single item in a character class as a primitive, where the
/// primitive either consists of a verbatim literal or a single escape
/// sequence.
///
/// This assumes the parser is positioned at the beginning of a primitive,
/// and advances the parser to the first position after the primitive if
/// successful.
///
/// Note that it is the caller&#39;s responsibility to report an error if an
/// illegal primitive was parsed.
</span><span class="attribute">#[inline(never)]
</span><span class="kw">fn </span>parse_set_class_item(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="prelude-ty">Result</span>&lt;Primitive&gt; {
<span class="kw">if </span><span class="self">self</span>.char() == <span class="string">&#39;\\&#39; </span>{
<span class="self">self</span>.parse_escape()
} <span class="kw">else </span>{
<span class="kw">let </span>x = Primitive::Literal(ast::Literal {
span: <span class="self">self</span>.span_char(),
kind: ast::LiteralKind::Verbatim,
c: <span class="self">self</span>.char(),
});
<span class="self">self</span>.bump();
<span class="prelude-val">Ok</span>(x)
}
}
<span class="doccomment">/// Parses the opening of a character class set. This includes the opening
/// bracket along with `^` if present to indicate negation. This also
/// starts parsing the opening set of unioned items if applicable, since
/// there are special rules applied to certain characters in the opening
/// of a character class. For example, `[^]]` is the class of all
/// characters not equal to `]`. (`]` would need to be escaped in any other
/// position.) Similarly for `-`.
///
/// In all cases, the op inside the returned `ast::ClassBracketed` is an
/// empty union. This empty union should be replaced with the actual item
/// when it is popped from the parser&#39;s stack.
///
/// This assumes the parser is positioned at the opening `[` and advances
/// the parser to the first non-special byte of the character class.
///
/// An error is returned if EOF is found.
</span><span class="attribute">#[inline(never)]
</span><span class="kw">fn </span>parse_set_class_open(
<span class="kw-2">&amp;</span><span class="self">self</span>,
) -&gt; <span class="prelude-ty">Result</span>&lt;(ast::ClassBracketed, ast::ClassSetUnion)&gt; {
<span class="macro">assert_eq!</span>(<span class="self">self</span>.char(), <span class="string">&#39;[&#39;</span>);
<span class="kw">let </span>start = <span class="self">self</span>.pos();
<span class="kw">if </span>!<span class="self">self</span>.bump_and_bump_space() {
<span class="kw">return </span><span class="prelude-val">Err</span>(<span class="self">self</span>.error(
Span::new(start, <span class="self">self</span>.pos()),
ast::ErrorKind::ClassUnclosed,
));
}
<span class="kw">let </span>negated = <span class="kw">if </span><span class="self">self</span>.char() != <span class="string">&#39;^&#39; </span>{
<span class="bool-val">false
</span>} <span class="kw">else </span>{
<span class="kw">if </span>!<span class="self">self</span>.bump_and_bump_space() {
<span class="kw">return </span><span class="prelude-val">Err</span>(<span class="self">self</span>.error(
Span::new(start, <span class="self">self</span>.pos()),
ast::ErrorKind::ClassUnclosed,
));
}
<span class="bool-val">true
</span>};
<span class="comment">// Accept any number of `-` as literal `-`.
</span><span class="kw">let </span><span class="kw-2">mut </span>union =
ast::ClassSetUnion { span: <span class="self">self</span>.span(), items: <span class="macro">vec!</span>[] };
<span class="kw">while </span><span class="self">self</span>.char() == <span class="string">&#39;-&#39; </span>{
union.push(ast::ClassSetItem::Literal(ast::Literal {
span: <span class="self">self</span>.span_char(),
kind: ast::LiteralKind::Verbatim,
c: <span class="string">&#39;-&#39;</span>,
}));
<span class="kw">if </span>!<span class="self">self</span>.bump_and_bump_space() {
<span class="kw">return </span><span class="prelude-val">Err</span>(<span class="self">self</span>.error(
Span::new(start, start),
ast::ErrorKind::ClassUnclosed,
));
}
}
<span class="comment">// If `]` is the *first* char in a set, then interpret it as a literal
// `]`. That is, an empty class is impossible to write.
</span><span class="kw">if </span>union.items.is_empty() &amp;&amp; <span class="self">self</span>.char() == <span class="string">&#39;]&#39; </span>{
union.push(ast::ClassSetItem::Literal(ast::Literal {
span: <span class="self">self</span>.span_char(),
kind: ast::LiteralKind::Verbatim,
c: <span class="string">&#39;]&#39;</span>,
}));
<span class="kw">if </span>!<span class="self">self</span>.bump_and_bump_space() {
<span class="kw">return </span><span class="prelude-val">Err</span>(<span class="self">self</span>.error(
Span::new(start, <span class="self">self</span>.pos()),
ast::ErrorKind::ClassUnclosed,
));
}
}
<span class="kw">let </span>set = ast::ClassBracketed {
span: Span::new(start, <span class="self">self</span>.pos()),
negated,
kind: ast::ClassSet::union(ast::ClassSetUnion {
span: Span::new(union.span.start, union.span.start),
items: <span class="macro">vec!</span>[],
}),
};
<span class="prelude-val">Ok</span>((set, union))
}
<span class="doccomment">/// Attempt to parse an ASCII character class, e.g., `[:alnum:]`.
///
/// This assumes the parser is positioned at the opening `[`.
///
/// If no valid ASCII character class could be found, then this does not
/// advance the parser and `None` is returned. Otherwise, the parser is
/// advanced to the first byte following the closing `]` and the
/// corresponding ASCII class is returned.
</span><span class="attribute">#[inline(never)]
</span><span class="kw">fn </span>maybe_parse_ascii_class(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="prelude-ty">Option</span>&lt;ast::ClassAscii&gt; {
<span class="comment">// ASCII character classes are interesting from a parsing perspective
// because parsing cannot fail with any interesting error. For example,
// in order to use an ASCII character class, it must be enclosed in
// double brackets, e.g., `[[:alnum:]]`. Alternatively, you might think
// of it as &quot;ASCII character characters have the syntax `[:NAME:]`
// which can only appear within character brackets.&quot; This means that
// things like `[[:lower:]A]` are legal constructs.
//
// However, if one types an incorrect ASCII character class, e.g.,
// `[[:loower:]]`, then we treat that as a normal nested character
// class containing the characters `:elorw`. One might argue that we
// should return an error instead since the repeated colons give away
// the intent to write an ASCII class. But what if the user typed
// `[[:lower]]` instead? How can we tell that was intended to be an
// ASCII class and not just a normal nested class?
//
// Reasonable people can probably disagree over this, but for better
// or worse, we implement semantics that never fails at the expense
// of better failure modes.
</span><span class="macro">assert_eq!</span>(<span class="self">self</span>.char(), <span class="string">&#39;[&#39;</span>);
<span class="comment">// If parsing fails, then we back up the parser to this starting point.
</span><span class="kw">let </span>start = <span class="self">self</span>.pos();
<span class="kw">let </span><span class="kw-2">mut </span>negated = <span class="bool-val">false</span>;
<span class="kw">if </span>!<span class="self">self</span>.bump() || <span class="self">self</span>.char() != <span class="string">&#39;:&#39; </span>{
<span class="self">self</span>.parser().pos.set(start);
<span class="kw">return </span><span class="prelude-val">None</span>;
}
<span class="kw">if </span>!<span class="self">self</span>.bump() {
<span class="self">self</span>.parser().pos.set(start);
<span class="kw">return </span><span class="prelude-val">None</span>;
}
<span class="kw">if </span><span class="self">self</span>.char() == <span class="string">&#39;^&#39; </span>{
negated = <span class="bool-val">true</span>;
<span class="kw">if </span>!<span class="self">self</span>.bump() {
<span class="self">self</span>.parser().pos.set(start);
<span class="kw">return </span><span class="prelude-val">None</span>;
}
}
<span class="kw">let </span>name_start = <span class="self">self</span>.offset();
<span class="kw">while </span><span class="self">self</span>.char() != <span class="string">&#39;:&#39; </span>&amp;&amp; <span class="self">self</span>.bump() {}
<span class="kw">if </span><span class="self">self</span>.is_eof() {
<span class="self">self</span>.parser().pos.set(start);
<span class="kw">return </span><span class="prelude-val">None</span>;
}
<span class="kw">let </span>name = <span class="kw-2">&amp;</span><span class="self">self</span>.pattern()[name_start..<span class="self">self</span>.offset()];
<span class="kw">if </span>!<span class="self">self</span>.bump_if(<span class="string">&quot;:]&quot;</span>) {
<span class="self">self</span>.parser().pos.set(start);
<span class="kw">return </span><span class="prelude-val">None</span>;
}
<span class="kw">let </span>kind = <span class="kw">match </span>ast::ClassAsciiKind::from_name(name) {
<span class="prelude-val">Some</span>(kind) =&gt; kind,
<span class="prelude-val">None </span>=&gt; {
<span class="self">self</span>.parser().pos.set(start);
<span class="kw">return </span><span class="prelude-val">None</span>;
}
};
<span class="prelude-val">Some</span>(ast::ClassAscii {
span: Span::new(start, <span class="self">self</span>.pos()),
kind,
negated,
})
}
<span class="doccomment">/// Parse a Unicode class in either the single character notation, `\pN`
/// or the multi-character bracketed notation, `\p{Greek}`. This assumes
/// the parser is positioned at the `p` (or `P` for negation) and will
/// advance the parser to the character immediately following the class.
///
/// Note that this does not check whether the class name is valid or not.
</span><span class="attribute">#[inline(never)]
</span><span class="kw">fn </span>parse_unicode_class(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="prelude-ty">Result</span>&lt;ast::ClassUnicode&gt; {
<span class="macro">assert!</span>(<span class="self">self</span>.char() == <span class="string">&#39;p&#39; </span>|| <span class="self">self</span>.char() == <span class="string">&#39;P&#39;</span>);
<span class="kw">let </span><span class="kw-2">mut </span>scratch = <span class="self">self</span>.parser().scratch.borrow_mut();
scratch.clear();
<span class="kw">let </span>negated = <span class="self">self</span>.char() == <span class="string">&#39;P&#39;</span>;
<span class="kw">if </span>!<span class="self">self</span>.bump_and_bump_space() {
<span class="kw">return </span><span class="prelude-val">Err</span>(
<span class="self">self</span>.error(<span class="self">self</span>.span(), ast::ErrorKind::EscapeUnexpectedEof)
);
}
<span class="kw">let </span>(start, kind) = <span class="kw">if </span><span class="self">self</span>.char() == <span class="string">&#39;{&#39; </span>{
<span class="kw">let </span>start = <span class="self">self</span>.span_char().end;
<span class="kw">while </span><span class="self">self</span>.bump_and_bump_space() &amp;&amp; <span class="self">self</span>.char() != <span class="string">&#39;}&#39; </span>{
scratch.push(<span class="self">self</span>.char());
}
<span class="kw">if </span><span class="self">self</span>.is_eof() {
<span class="kw">return </span><span class="prelude-val">Err</span>(<span class="self">self
</span>.error(<span class="self">self</span>.span(), ast::ErrorKind::EscapeUnexpectedEof));
}
<span class="macro">assert_eq!</span>(<span class="self">self</span>.char(), <span class="string">&#39;}&#39;</span>);
<span class="self">self</span>.bump();
<span class="kw">let </span>name = scratch.as_str();
<span class="kw">if let </span><span class="prelude-val">Some</span>(i) = name.find(<span class="string">&quot;!=&quot;</span>) {
(
start,
ast::ClassUnicodeKind::NamedValue {
op: ast::ClassUnicodeOpKind::NotEqual,
name: name[..i].to_string(),
value: name[i + <span class="number">2</span>..].to_string(),
},
)
} <span class="kw">else if let </span><span class="prelude-val">Some</span>(i) = name.find(<span class="string">&#39;:&#39;</span>) {
(
start,
ast::ClassUnicodeKind::NamedValue {
op: ast::ClassUnicodeOpKind::Colon,
name: name[..i].to_string(),
value: name[i + <span class="number">1</span>..].to_string(),
},
)
} <span class="kw">else if let </span><span class="prelude-val">Some</span>(i) = name.find(<span class="string">&#39;=&#39;</span>) {
(
start,
ast::ClassUnicodeKind::NamedValue {
op: ast::ClassUnicodeOpKind::Equal,
name: name[..i].to_string(),
value: name[i + <span class="number">1</span>..].to_string(),
},
)
} <span class="kw">else </span>{
(start, ast::ClassUnicodeKind::Named(name.to_string()))
}
} <span class="kw">else </span>{
<span class="kw">let </span>start = <span class="self">self</span>.pos();
<span class="kw">let </span>c = <span class="self">self</span>.char();
<span class="kw">if </span>c == <span class="string">&#39;\\&#39; </span>{
<span class="kw">return </span><span class="prelude-val">Err</span>(<span class="self">self</span>.error(
<span class="self">self</span>.span_char(),
ast::ErrorKind::UnicodeClassInvalid,
));
}
<span class="self">self</span>.bump_and_bump_space();
<span class="kw">let </span>kind = ast::ClassUnicodeKind::OneLetter(c);
(start, kind)
};
<span class="prelude-val">Ok</span>(ast::ClassUnicode {
span: Span::new(start, <span class="self">self</span>.pos()),
negated,
kind,
})
}
<span class="doccomment">/// Parse a Perl character class, e.g., `\d` or `\W`. This assumes the
/// parser is currently at a valid character class name and will be
/// advanced to the character immediately following the class.
</span><span class="attribute">#[inline(never)]
</span><span class="kw">fn </span>parse_perl_class(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; ast::ClassPerl {
<span class="kw">let </span>c = <span class="self">self</span>.char();
<span class="kw">let </span>span = <span class="self">self</span>.span_char();
<span class="self">self</span>.bump();
<span class="kw">let </span>(negated, kind) = <span class="kw">match </span>c {
<span class="string">&#39;d&#39; </span>=&gt; (<span class="bool-val">false</span>, ast::ClassPerlKind::Digit),
<span class="string">&#39;D&#39; </span>=&gt; (<span class="bool-val">true</span>, ast::ClassPerlKind::Digit),
<span class="string">&#39;s&#39; </span>=&gt; (<span class="bool-val">false</span>, ast::ClassPerlKind::Space),
<span class="string">&#39;S&#39; </span>=&gt; (<span class="bool-val">true</span>, ast::ClassPerlKind::Space),
<span class="string">&#39;w&#39; </span>=&gt; (<span class="bool-val">false</span>, ast::ClassPerlKind::Word),
<span class="string">&#39;W&#39; </span>=&gt; (<span class="bool-val">true</span>, ast::ClassPerlKind::Word),
c =&gt; <span class="macro">panic!</span>(<span class="string">&quot;expected valid Perl class but got &#39;{}&#39;&quot;</span>, c),
};
ast::ClassPerl { span, kind, negated }
}
}
<span class="doccomment">/// A type that traverses a fully parsed Ast and checks whether its depth
/// exceeds the specified nesting limit. If it does, then an error is returned.
</span><span class="attribute">#[derive(Debug)]
</span><span class="kw">struct </span>NestLimiter&lt;<span class="lifetime">&#39;p</span>, <span class="lifetime">&#39;s</span>, P&gt; {
<span class="doccomment">/// The parser that is checking the nest limit.
</span>p: <span class="kw-2">&amp;</span><span class="lifetime">&#39;p </span>ParserI&lt;<span class="lifetime">&#39;s</span>, P&gt;,
<span class="doccomment">/// The current depth while walking an Ast.
</span>depth: u32,
}
<span class="kw">impl</span>&lt;<span class="lifetime">&#39;p</span>, <span class="lifetime">&#39;s</span>, P: Borrow&lt;Parser&gt;&gt; NestLimiter&lt;<span class="lifetime">&#39;p</span>, <span class="lifetime">&#39;s</span>, P&gt; {
<span class="kw">fn </span>new(p: <span class="kw-2">&amp;</span><span class="lifetime">&#39;p </span>ParserI&lt;<span class="lifetime">&#39;s</span>, P&gt;) -&gt; NestLimiter&lt;<span class="lifetime">&#39;p</span>, <span class="lifetime">&#39;s</span>, P&gt; {
NestLimiter { p, depth: <span class="number">0 </span>}
}
<span class="attribute">#[inline(never)]
</span><span class="kw">fn </span>check(<span class="self">self</span>, ast: <span class="kw-2">&amp;</span>Ast) -&gt; <span class="prelude-ty">Result</span>&lt;()&gt; {
ast::visit(ast, <span class="self">self</span>)
}
<span class="kw">fn </span>increment_depth(<span class="kw-2">&amp;mut </span><span class="self">self</span>, span: <span class="kw-2">&amp;</span>Span) -&gt; <span class="prelude-ty">Result</span>&lt;()&gt; {
<span class="kw">let </span>new = <span class="self">self</span>.depth.checked_add(<span class="number">1</span>).ok_or_else(|| {
<span class="self">self</span>.p.error(
span.clone(),
ast::ErrorKind::NestLimitExceeded(u32::MAX),
)
})<span class="question-mark">?</span>;
<span class="kw">let </span>limit = <span class="self">self</span>.p.parser().nest_limit;
<span class="kw">if </span>new &gt; limit {
<span class="kw">return </span><span class="prelude-val">Err</span>(<span class="self">self</span>.p.error(
span.clone(),
ast::ErrorKind::NestLimitExceeded(limit),
));
}
<span class="self">self</span>.depth = new;
<span class="prelude-val">Ok</span>(())
}
<span class="kw">fn </span>decrement_depth(<span class="kw-2">&amp;mut </span><span class="self">self</span>) {
<span class="comment">// Assuming the correctness of the visitor, this should never drop
// below 0.
</span><span class="self">self</span>.depth = <span class="self">self</span>.depth.checked_sub(<span class="number">1</span>).unwrap();
}
}
<span class="kw">impl</span>&lt;<span class="lifetime">&#39;p</span>, <span class="lifetime">&#39;s</span>, P: Borrow&lt;Parser&gt;&gt; ast::Visitor <span class="kw">for </span>NestLimiter&lt;<span class="lifetime">&#39;p</span>, <span class="lifetime">&#39;s</span>, P&gt; {
<span class="kw">type </span>Output = ();
<span class="kw">type </span><span class="prelude-val">Err </span>= ast::Error;
<span class="kw">fn </span>finish(<span class="self">self</span>) -&gt; <span class="prelude-ty">Result</span>&lt;()&gt; {
<span class="prelude-val">Ok</span>(())
}
<span class="kw">fn </span>visit_pre(<span class="kw-2">&amp;mut </span><span class="self">self</span>, ast: <span class="kw-2">&amp;</span>Ast) -&gt; <span class="prelude-ty">Result</span>&lt;()&gt; {
<span class="kw">let </span>span = <span class="kw">match </span><span class="kw-2">*</span>ast {
Ast::Empty(<span class="kw">_</span>)
| Ast::Flags(<span class="kw">_</span>)
| Ast::Literal(<span class="kw">_</span>)
| Ast::Dot(<span class="kw">_</span>)
| Ast::Assertion(<span class="kw">_</span>)
| Ast::Class(ast::Class::Unicode(<span class="kw">_</span>))
| Ast::Class(ast::Class::Perl(<span class="kw">_</span>)) =&gt; {
<span class="comment">// These are all base cases, so we don&#39;t increment depth.
</span><span class="kw">return </span><span class="prelude-val">Ok</span>(());
}
Ast::Class(ast::Class::Bracketed(<span class="kw-2">ref </span>x)) =&gt; <span class="kw-2">&amp;</span>x.span,
Ast::Repetition(<span class="kw-2">ref </span>x) =&gt; <span class="kw-2">&amp;</span>x.span,
Ast::Group(<span class="kw-2">ref </span>x) =&gt; <span class="kw-2">&amp;</span>x.span,
Ast::Alternation(<span class="kw-2">ref </span>x) =&gt; <span class="kw-2">&amp;</span>x.span,
Ast::Concat(<span class="kw-2">ref </span>x) =&gt; <span class="kw-2">&amp;</span>x.span,
};
<span class="self">self</span>.increment_depth(span)
}
<span class="kw">fn </span>visit_post(<span class="kw-2">&amp;mut </span><span class="self">self</span>, ast: <span class="kw-2">&amp;</span>Ast) -&gt; <span class="prelude-ty">Result</span>&lt;()&gt; {
<span class="kw">match </span><span class="kw-2">*</span>ast {
Ast::Empty(<span class="kw">_</span>)
| Ast::Flags(<span class="kw">_</span>)
| Ast::Literal(<span class="kw">_</span>)
| Ast::Dot(<span class="kw">_</span>)
| Ast::Assertion(<span class="kw">_</span>)
| Ast::Class(ast::Class::Unicode(<span class="kw">_</span>))
| Ast::Class(ast::Class::Perl(<span class="kw">_</span>)) =&gt; {
<span class="comment">// These are all base cases, so we don&#39;t decrement depth.
</span><span class="prelude-val">Ok</span>(())
}
Ast::Class(ast::Class::Bracketed(<span class="kw">_</span>))
| Ast::Repetition(<span class="kw">_</span>)
| Ast::Group(<span class="kw">_</span>)
| Ast::Alternation(<span class="kw">_</span>)
| Ast::Concat(<span class="kw">_</span>) =&gt; {
<span class="self">self</span>.decrement_depth();
<span class="prelude-val">Ok</span>(())
}
}
}
<span class="kw">fn </span>visit_class_set_item_pre(
<span class="kw-2">&amp;mut </span><span class="self">self</span>,
ast: <span class="kw-2">&amp;</span>ast::ClassSetItem,
) -&gt; <span class="prelude-ty">Result</span>&lt;()&gt; {
<span class="kw">let </span>span = <span class="kw">match </span><span class="kw-2">*</span>ast {
ast::ClassSetItem::Empty(<span class="kw">_</span>)
| ast::ClassSetItem::Literal(<span class="kw">_</span>)
| ast::ClassSetItem::Range(<span class="kw">_</span>)
| ast::ClassSetItem::Ascii(<span class="kw">_</span>)
| ast::ClassSetItem::Unicode(<span class="kw">_</span>)
| ast::ClassSetItem::Perl(<span class="kw">_</span>) =&gt; {
<span class="comment">// These are all base cases, so we don&#39;t increment depth.
</span><span class="kw">return </span><span class="prelude-val">Ok</span>(());
}
ast::ClassSetItem::Bracketed(<span class="kw-2">ref </span>x) =&gt; <span class="kw-2">&amp;</span>x.span,
ast::ClassSetItem::Union(<span class="kw-2">ref </span>x) =&gt; <span class="kw-2">&amp;</span>x.span,
};
<span class="self">self</span>.increment_depth(span)
}
<span class="kw">fn </span>visit_class_set_item_post(
<span class="kw-2">&amp;mut </span><span class="self">self</span>,
ast: <span class="kw-2">&amp;</span>ast::ClassSetItem,
) -&gt; <span class="prelude-ty">Result</span>&lt;()&gt; {
<span class="kw">match </span><span class="kw-2">*</span>ast {
ast::ClassSetItem::Empty(<span class="kw">_</span>)
| ast::ClassSetItem::Literal(<span class="kw">_</span>)
| ast::ClassSetItem::Range(<span class="kw">_</span>)
| ast::ClassSetItem::Ascii(<span class="kw">_</span>)
| ast::ClassSetItem::Unicode(<span class="kw">_</span>)
| ast::ClassSetItem::Perl(<span class="kw">_</span>) =&gt; {
<span class="comment">// These are all base cases, so we don&#39;t decrement depth.
</span><span class="prelude-val">Ok</span>(())
}
ast::ClassSetItem::Bracketed(<span class="kw">_</span>) | ast::ClassSetItem::Union(<span class="kw">_</span>) =&gt; {
<span class="self">self</span>.decrement_depth();
<span class="prelude-val">Ok</span>(())
}
}
}
<span class="kw">fn </span>visit_class_set_binary_op_pre(
<span class="kw-2">&amp;mut </span><span class="self">self</span>,
ast: <span class="kw-2">&amp;</span>ast::ClassSetBinaryOp,
) -&gt; <span class="prelude-ty">Result</span>&lt;()&gt; {
<span class="self">self</span>.increment_depth(<span class="kw-2">&amp;</span>ast.span)
}
<span class="kw">fn </span>visit_class_set_binary_op_post(
<span class="kw-2">&amp;mut </span><span class="self">self</span>,
_ast: <span class="kw-2">&amp;</span>ast::ClassSetBinaryOp,
) -&gt; <span class="prelude-ty">Result</span>&lt;()&gt; {
<span class="self">self</span>.decrement_depth();
<span class="prelude-val">Ok</span>(())
}
}
<span class="doccomment">/// When the result is an error, transforms the ast::ErrorKind from the source
/// Result into another one. This function is used to return clearer error
/// messages when possible.
</span><span class="kw">fn </span>specialize_err&lt;T&gt;(
result: <span class="prelude-ty">Result</span>&lt;T&gt;,
from: ast::ErrorKind,
to: ast::ErrorKind,
) -&gt; <span class="prelude-ty">Result</span>&lt;T&gt; {
<span class="kw">if let </span><span class="prelude-val">Err</span>(e) = result {
<span class="kw">if </span>e.kind == from {
<span class="prelude-val">Err</span>(ast::Error { kind: to, pattern: e.pattern, span: e.span })
} <span class="kw">else </span>{
<span class="prelude-val">Err</span>(e)
}
} <span class="kw">else </span>{
result
}
}
<span class="attribute">#[cfg(test)]
</span><span class="kw">mod </span>tests {
<span class="kw">use </span>core::ops::Range;
<span class="kw">use </span>alloc::format;
<span class="kw">use </span><span class="kw">crate</span>::ast::{<span class="self">self</span>, Ast, Position, Span};
<span class="kw">use super</span>::<span class="kw-2">*</span>;
<span class="comment">// Our own assert_eq, which has slightly better formatting (but honestly
// still kind of crappy).
</span><span class="macro">macro_rules! </span>assert_eq {
(<span class="macro-nonterminal">$left</span>:expr, <span class="macro-nonterminal">$right</span>:expr) =&gt; {{
<span class="kw">match </span>(<span class="kw-2">&amp;</span><span class="macro-nonterminal">$left</span>, <span class="kw-2">&amp;</span><span class="macro-nonterminal">$right</span>) {
(left_val, right_val) =&gt; {
<span class="kw">if </span>!(<span class="kw-2">*</span>left_val == <span class="kw-2">*</span>right_val) {
<span class="macro">panic!</span>(
<span class="string">&quot;assertion failed: `(left == right)`\n\n\
left: `{:?}`\nright: `{:?}`\n\n&quot;</span>,
left_val, right_val
)
}
}
}
}};
}
<span class="comment">// We create these errors to compare with real ast::Errors in the tests.
// We define equality between TestError and ast::Error to disregard the
// pattern string in ast::Error, which is annoying to provide in tests.
</span><span class="attribute">#[derive(Clone, Debug)]
</span><span class="kw">struct </span>TestError {
span: Span,
kind: ast::ErrorKind,
}
<span class="kw">impl </span>PartialEq&lt;ast::Error&gt; <span class="kw">for </span>TestError {
<span class="kw">fn </span>eq(<span class="kw-2">&amp;</span><span class="self">self</span>, other: <span class="kw-2">&amp;</span>ast::Error) -&gt; bool {
<span class="self">self</span>.span == other.span &amp;&amp; <span class="self">self</span>.kind == other.kind
}
}
<span class="kw">impl </span>PartialEq&lt;TestError&gt; <span class="kw">for </span>ast::Error {
<span class="kw">fn </span>eq(<span class="kw-2">&amp;</span><span class="self">self</span>, other: <span class="kw-2">&amp;</span>TestError) -&gt; bool {
<span class="self">self</span>.span == other.span &amp;&amp; <span class="self">self</span>.kind == other.kind
}
}
<span class="kw">fn </span>s(str: <span class="kw-2">&amp;</span>str) -&gt; String {
str.to_string()
}
<span class="kw">fn </span>parser(pattern: <span class="kw-2">&amp;</span>str) -&gt; ParserI&lt;<span class="lifetime">&#39;_</span>, Parser&gt; {
ParserI::new(Parser::new(), pattern)
}
<span class="kw">fn </span>parser_octal(pattern: <span class="kw-2">&amp;</span>str) -&gt; ParserI&lt;<span class="lifetime">&#39;_</span>, Parser&gt; {
<span class="kw">let </span>parser = ParserBuilder::new().octal(<span class="bool-val">true</span>).build();
ParserI::new(parser, pattern)
}
<span class="kw">fn </span>parser_nest_limit(
pattern: <span class="kw-2">&amp;</span>str,
nest_limit: u32,
) -&gt; ParserI&lt;<span class="lifetime">&#39;_</span>, Parser&gt; {
<span class="kw">let </span>p = ParserBuilder::new().nest_limit(nest_limit).build();
ParserI::new(p, pattern)
}
<span class="kw">fn </span>parser_ignore_whitespace(pattern: <span class="kw-2">&amp;</span>str) -&gt; ParserI&lt;<span class="lifetime">&#39;_</span>, Parser&gt; {
<span class="kw">let </span>p = ParserBuilder::new().ignore_whitespace(<span class="bool-val">true</span>).build();
ParserI::new(p, pattern)
}
<span class="doccomment">/// Short alias for creating a new span.
</span><span class="kw">fn </span>nspan(start: Position, end: Position) -&gt; Span {
Span::new(start, end)
}
<span class="doccomment">/// Short alias for creating a new position.
</span><span class="kw">fn </span>npos(offset: usize, line: usize, column: usize) -&gt; Position {
Position::new(offset, line, column)
}
<span class="doccomment">/// Create a new span from the given offset range. This assumes a single
/// line and sets the columns based on the offsets. i.e., This only works
/// out of the box for ASCII, which is fine for most tests.
</span><span class="kw">fn </span>span(range: Range&lt;usize&gt;) -&gt; Span {
<span class="kw">let </span>start = Position::new(range.start, <span class="number">1</span>, range.start + <span class="number">1</span>);
<span class="kw">let </span>end = Position::new(range.end, <span class="number">1</span>, range.end + <span class="number">1</span>);
Span::new(start, end)
}
<span class="doccomment">/// Create a new span for the corresponding byte range in the given string.
</span><span class="kw">fn </span>span_range(subject: <span class="kw-2">&amp;</span>str, range: Range&lt;usize&gt;) -&gt; Span {
<span class="kw">let </span>start = Position {
offset: range.start,
line: <span class="number">1 </span>+ subject[..range.start].matches(<span class="string">&#39;\n&#39;</span>).count(),
column: <span class="number">1 </span>+ subject[..range.start]
.chars()
.rev()
.position(|c| c == <span class="string">&#39;\n&#39;</span>)
.unwrap_or(subject[..range.start].chars().count()),
};
<span class="kw">let </span>end = Position {
offset: range.end,
line: <span class="number">1 </span>+ subject[..range.end].matches(<span class="string">&#39;\n&#39;</span>).count(),
column: <span class="number">1 </span>+ subject[..range.end]
.chars()
.rev()
.position(|c| c == <span class="string">&#39;\n&#39;</span>)
.unwrap_or(subject[..range.end].chars().count()),
};
Span::new(start, end)
}
<span class="doccomment">/// Create a verbatim literal starting at the given position.
</span><span class="kw">fn </span>lit(c: char, start: usize) -&gt; Ast {
lit_with(c, span(start..start + c.len_utf8()))
}
<span class="doccomment">/// Create a meta literal starting at the given position.
</span><span class="kw">fn </span>meta_lit(c: char, span: Span) -&gt; Ast {
Ast::Literal(ast::Literal { span, kind: ast::LiteralKind::Meta, c })
}
<span class="doccomment">/// Create a verbatim literal with the given span.
</span><span class="kw">fn </span>lit_with(c: char, span: Span) -&gt; Ast {
Ast::Literal(ast::Literal {
span,
kind: ast::LiteralKind::Verbatim,
c,
})
}
<span class="doccomment">/// Create a concatenation with the given range.
</span><span class="kw">fn </span>concat(range: Range&lt;usize&gt;, asts: Vec&lt;Ast&gt;) -&gt; Ast {
concat_with(span(range), asts)
}
<span class="doccomment">/// Create a concatenation with the given span.
</span><span class="kw">fn </span>concat_with(span: Span, asts: Vec&lt;Ast&gt;) -&gt; Ast {
Ast::Concat(ast::Concat { span, asts })
}
<span class="doccomment">/// Create an alternation with the given span.
</span><span class="kw">fn </span>alt(range: Range&lt;usize&gt;, asts: Vec&lt;Ast&gt;) -&gt; Ast {
Ast::Alternation(ast::Alternation { span: span(range), asts })
}
<span class="doccomment">/// Create a capturing group with the given span.
</span><span class="kw">fn </span>group(range: Range&lt;usize&gt;, index: u32, ast: Ast) -&gt; Ast {
Ast::Group(ast::Group {
span: span(range),
kind: ast::GroupKind::CaptureIndex(index),
ast: Box::new(ast),
})
}
<span class="doccomment">/// Create an ast::SetFlags.
///
/// The given pattern should be the full pattern string. The range given
/// should correspond to the byte offsets where the flag set occurs.
///
/// If negated is true, then the set is interpreted as beginning with a
/// negation.
</span><span class="kw">fn </span>flag_set(
pat: <span class="kw-2">&amp;</span>str,
range: Range&lt;usize&gt;,
flag: ast::Flag,
negated: bool,
) -&gt; Ast {
<span class="kw">let </span><span class="kw-2">mut </span>items = <span class="macro">vec!</span>[ast::FlagsItem {
span: span_range(pat, (range.end - <span class="number">2</span>)..(range.end - <span class="number">1</span>)),
kind: ast::FlagsItemKind::Flag(flag),
}];
<span class="kw">if </span>negated {
items.insert(
<span class="number">0</span>,
ast::FlagsItem {
span: span_range(pat, (range.start + <span class="number">2</span>)..(range.end - <span class="number">2</span>)),
kind: ast::FlagsItemKind::Negation,
},
);
}
Ast::Flags(ast::SetFlags {
span: span_range(pat, range.clone()),
flags: ast::Flags {
span: span_range(pat, (range.start + <span class="number">2</span>)..(range.end - <span class="number">1</span>)),
items,
},
})
}
<span class="attribute">#[test]
</span><span class="kw">fn </span>parse_nest_limit() {
<span class="comment">// A nest limit of 0 still allows some types of regexes.
</span><span class="macro">assert_eq!</span>(
parser_nest_limit(<span class="string">&quot;&quot;</span>, <span class="number">0</span>).parse(),
<span class="prelude-val">Ok</span>(Ast::Empty(span(<span class="number">0</span>..<span class="number">0</span>)))
);
<span class="macro">assert_eq!</span>(parser_nest_limit(<span class="string">&quot;a&quot;</span>, <span class="number">0</span>).parse(), <span class="prelude-val">Ok</span>(lit(<span class="string">&#39;a&#39;</span>, <span class="number">0</span>)));
<span class="comment">// Test repetition operations, which require one level of nesting.
</span><span class="macro">assert_eq!</span>(
parser_nest_limit(<span class="string">&quot;a+&quot;</span>, <span class="number">0</span>).parse().unwrap_err(),
TestError {
span: span(<span class="number">0</span>..<span class="number">2</span>),
kind: ast::ErrorKind::NestLimitExceeded(<span class="number">0</span>),
}
);
<span class="macro">assert_eq!</span>(
parser_nest_limit(<span class="string">&quot;a+&quot;</span>, <span class="number">1</span>).parse(),
<span class="prelude-val">Ok</span>(Ast::Repetition(ast::Repetition {
span: span(<span class="number">0</span>..<span class="number">2</span>),
op: ast::RepetitionOp {
span: span(<span class="number">1</span>..<span class="number">2</span>),
kind: ast::RepetitionKind::OneOrMore,
},
greedy: <span class="bool-val">true</span>,
ast: Box::new(lit(<span class="string">&#39;a&#39;</span>, <span class="number">0</span>)),
}))
);
<span class="macro">assert_eq!</span>(
parser_nest_limit(<span class="string">&quot;(a)+&quot;</span>, <span class="number">1</span>).parse().unwrap_err(),
TestError {
span: span(<span class="number">0</span>..<span class="number">3</span>),
kind: ast::ErrorKind::NestLimitExceeded(<span class="number">1</span>),
}
);
<span class="macro">assert_eq!</span>(
parser_nest_limit(<span class="string">&quot;a+*&quot;</span>, <span class="number">1</span>).parse().unwrap_err(),
TestError {
span: span(<span class="number">0</span>..<span class="number">2</span>),
kind: ast::ErrorKind::NestLimitExceeded(<span class="number">1</span>),
}
);
<span class="macro">assert_eq!</span>(
parser_nest_limit(<span class="string">&quot;a+*&quot;</span>, <span class="number">2</span>).parse(),
<span class="prelude-val">Ok</span>(Ast::Repetition(ast::Repetition {
span: span(<span class="number">0</span>..<span class="number">3</span>),
op: ast::RepetitionOp {
span: span(<span class="number">2</span>..<span class="number">3</span>),
kind: ast::RepetitionKind::ZeroOrMore,
},
greedy: <span class="bool-val">true</span>,
ast: Box::new(Ast::Repetition(ast::Repetition {
span: span(<span class="number">0</span>..<span class="number">2</span>),
op: ast::RepetitionOp {
span: span(<span class="number">1</span>..<span class="number">2</span>),
kind: ast::RepetitionKind::OneOrMore,
},
greedy: <span class="bool-val">true</span>,
ast: Box::new(lit(<span class="string">&#39;a&#39;</span>, <span class="number">0</span>)),
})),
}))
);
<span class="comment">// Test concatenations. A concatenation requires one level of nesting.
</span><span class="macro">assert_eq!</span>(
parser_nest_limit(<span class="string">&quot;ab&quot;</span>, <span class="number">0</span>).parse().unwrap_err(),
TestError {
span: span(<span class="number">0</span>..<span class="number">2</span>),
kind: ast::ErrorKind::NestLimitExceeded(<span class="number">0</span>),
}
);
<span class="macro">assert_eq!</span>(
parser_nest_limit(<span class="string">&quot;ab&quot;</span>, <span class="number">1</span>).parse(),
<span class="prelude-val">Ok</span>(concat(<span class="number">0</span>..<span class="number">2</span>, <span class="macro">vec!</span>[lit(<span class="string">&#39;a&#39;</span>, <span class="number">0</span>), lit(<span class="string">&#39;b&#39;</span>, <span class="number">1</span>)]))
);
<span class="macro">assert_eq!</span>(
parser_nest_limit(<span class="string">&quot;abc&quot;</span>, <span class="number">1</span>).parse(),
<span class="prelude-val">Ok</span>(concat(<span class="number">0</span>..<span class="number">3</span>, <span class="macro">vec!</span>[lit(<span class="string">&#39;a&#39;</span>, <span class="number">0</span>), lit(<span class="string">&#39;b&#39;</span>, <span class="number">1</span>), lit(<span class="string">&#39;c&#39;</span>, <span class="number">2</span>)]))
);
<span class="comment">// Test alternations. An alternation requires one level of nesting.
</span><span class="macro">assert_eq!</span>(
parser_nest_limit(<span class="string">&quot;a|b&quot;</span>, <span class="number">0</span>).parse().unwrap_err(),
TestError {
span: span(<span class="number">0</span>..<span class="number">3</span>),
kind: ast::ErrorKind::NestLimitExceeded(<span class="number">0</span>),
}
);
<span class="macro">assert_eq!</span>(
parser_nest_limit(<span class="string">&quot;a|b&quot;</span>, <span class="number">1</span>).parse(),
<span class="prelude-val">Ok</span>(alt(<span class="number">0</span>..<span class="number">3</span>, <span class="macro">vec!</span>[lit(<span class="string">&#39;a&#39;</span>, <span class="number">0</span>), lit(<span class="string">&#39;b&#39;</span>, <span class="number">2</span>)]))
);
<span class="macro">assert_eq!</span>(
parser_nest_limit(<span class="string">&quot;a|b|c&quot;</span>, <span class="number">1</span>).parse(),
<span class="prelude-val">Ok</span>(alt(<span class="number">0</span>..<span class="number">5</span>, <span class="macro">vec!</span>[lit(<span class="string">&#39;a&#39;</span>, <span class="number">0</span>), lit(<span class="string">&#39;b&#39;</span>, <span class="number">2</span>), lit(<span class="string">&#39;c&#39;</span>, <span class="number">4</span>)]))
);
<span class="comment">// Test character classes. Classes form their own mini-recursive
// syntax!
</span><span class="macro">assert_eq!</span>(
parser_nest_limit(<span class="string">&quot;[a]&quot;</span>, <span class="number">0</span>).parse().unwrap_err(),
TestError {
span: span(<span class="number">0</span>..<span class="number">3</span>),
kind: ast::ErrorKind::NestLimitExceeded(<span class="number">0</span>),
}
);
<span class="macro">assert_eq!</span>(
parser_nest_limit(<span class="string">&quot;[a]&quot;</span>, <span class="number">1</span>).parse(),
<span class="prelude-val">Ok</span>(Ast::Class(ast::Class::Bracketed(ast::ClassBracketed {
span: span(<span class="number">0</span>..<span class="number">3</span>),
negated: <span class="bool-val">false</span>,
kind: ast::ClassSet::Item(ast::ClassSetItem::Literal(
ast::Literal {
span: span(<span class="number">1</span>..<span class="number">2</span>),
kind: ast::LiteralKind::Verbatim,
c: <span class="string">&#39;a&#39;</span>,
}
)),
})))
);
<span class="macro">assert_eq!</span>(
parser_nest_limit(<span class="string">&quot;[ab]&quot;</span>, <span class="number">1</span>).parse().unwrap_err(),
TestError {
span: span(<span class="number">1</span>..<span class="number">3</span>),
kind: ast::ErrorKind::NestLimitExceeded(<span class="number">1</span>),
}
);
<span class="macro">assert_eq!</span>(
parser_nest_limit(<span class="string">&quot;[ab[cd]]&quot;</span>, <span class="number">2</span>).parse().unwrap_err(),
TestError {
span: span(<span class="number">3</span>..<span class="number">7</span>),
kind: ast::ErrorKind::NestLimitExceeded(<span class="number">2</span>),
}
);
<span class="macro">assert_eq!</span>(
parser_nest_limit(<span class="string">&quot;[ab[cd]]&quot;</span>, <span class="number">3</span>).parse().unwrap_err(),
TestError {
span: span(<span class="number">4</span>..<span class="number">6</span>),
kind: ast::ErrorKind::NestLimitExceeded(<span class="number">3</span>),
}
);
<span class="macro">assert_eq!</span>(
parser_nest_limit(<span class="string">&quot;[a--b]&quot;</span>, <span class="number">1</span>).parse().unwrap_err(),
TestError {
span: span(<span class="number">1</span>..<span class="number">5</span>),
kind: ast::ErrorKind::NestLimitExceeded(<span class="number">1</span>),
}
);
<span class="macro">assert_eq!</span>(
parser_nest_limit(<span class="string">&quot;[a--bc]&quot;</span>, <span class="number">2</span>).parse().unwrap_err(),
TestError {
span: span(<span class="number">4</span>..<span class="number">6</span>),
kind: ast::ErrorKind::NestLimitExceeded(<span class="number">2</span>),
}
);
}
<span class="attribute">#[test]
</span><span class="kw">fn </span>parse_comments() {
<span class="kw">let </span>pat = <span class="string">&quot;(?x)
# This is comment 1.
foo # This is comment 2.
# This is comment 3.
bar
# This is comment 4.&quot;</span>;
<span class="kw">let </span>astc = parser(pat).parse_with_comments().unwrap();
<span class="macro">assert_eq!</span>(
astc.ast,
concat_with(
span_range(pat, <span class="number">0</span>..pat.len()),
<span class="macro">vec!</span>[
flag_set(pat, <span class="number">0</span>..<span class="number">4</span>, ast::Flag::IgnoreWhitespace, <span class="bool-val">false</span>),
lit_with(<span class="string">&#39;f&#39;</span>, span_range(pat, <span class="number">26</span>..<span class="number">27</span>)),
lit_with(<span class="string">&#39;o&#39;</span>, span_range(pat, <span class="number">27</span>..<span class="number">28</span>)),
lit_with(<span class="string">&#39;o&#39;</span>, span_range(pat, <span class="number">28</span>..<span class="number">29</span>)),
lit_with(<span class="string">&#39;b&#39;</span>, span_range(pat, <span class="number">74</span>..<span class="number">75</span>)),
lit_with(<span class="string">&#39;a&#39;</span>, span_range(pat, <span class="number">75</span>..<span class="number">76</span>)),
lit_with(<span class="string">&#39;r&#39;</span>, span_range(pat, <span class="number">76</span>..<span class="number">77</span>)),
]
)
);
<span class="macro">assert_eq!</span>(
astc.comments,
<span class="macro">vec!</span>[
ast::Comment {
span: span_range(pat, <span class="number">5</span>..<span class="number">26</span>),
comment: s(<span class="string">&quot; This is comment 1.&quot;</span>),
},
ast::Comment {
span: span_range(pat, <span class="number">30</span>..<span class="number">51</span>),
comment: s(<span class="string">&quot; This is comment 2.&quot;</span>),
},
ast::Comment {
span: span_range(pat, <span class="number">53</span>..<span class="number">74</span>),
comment: s(<span class="string">&quot; This is comment 3.&quot;</span>),
},
ast::Comment {
span: span_range(pat, <span class="number">78</span>..<span class="number">98</span>),
comment: s(<span class="string">&quot; This is comment 4.&quot;</span>),
},
]
);
}
<span class="attribute">#[test]
</span><span class="kw">fn </span>parse_holistic() {
<span class="macro">assert_eq!</span>(parser(<span class="string">&quot;]&quot;</span>).parse(), <span class="prelude-val">Ok</span>(lit(<span class="string">&#39;]&#39;</span>, <span class="number">0</span>)));
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;\\\.\+\*\?\(\)\|\[\]\{\}\^\$\#\&amp;\-\~&quot;</span>).parse(),
<span class="prelude-val">Ok</span>(concat(
<span class="number">0</span>..<span class="number">36</span>,
<span class="macro">vec!</span>[
meta_lit(<span class="string">&#39;\\&#39;</span>, span(<span class="number">0</span>..<span class="number">2</span>)),
meta_lit(<span class="string">&#39;.&#39;</span>, span(<span class="number">2</span>..<span class="number">4</span>)),
meta_lit(<span class="string">&#39;+&#39;</span>, span(<span class="number">4</span>..<span class="number">6</span>)),
meta_lit(<span class="string">&#39;*&#39;</span>, span(<span class="number">6</span>..<span class="number">8</span>)),
meta_lit(<span class="string">&#39;?&#39;</span>, span(<span class="number">8</span>..<span class="number">10</span>)),
meta_lit(<span class="string">&#39;(&#39;</span>, span(<span class="number">10</span>..<span class="number">12</span>)),
meta_lit(<span class="string">&#39;)&#39;</span>, span(<span class="number">12</span>..<span class="number">14</span>)),
meta_lit(<span class="string">&#39;|&#39;</span>, span(<span class="number">14</span>..<span class="number">16</span>)),
meta_lit(<span class="string">&#39;[&#39;</span>, span(<span class="number">16</span>..<span class="number">18</span>)),
meta_lit(<span class="string">&#39;]&#39;</span>, span(<span class="number">18</span>..<span class="number">20</span>)),
meta_lit(<span class="string">&#39;{&#39;</span>, span(<span class="number">20</span>..<span class="number">22</span>)),
meta_lit(<span class="string">&#39;}&#39;</span>, span(<span class="number">22</span>..<span class="number">24</span>)),
meta_lit(<span class="string">&#39;^&#39;</span>, span(<span class="number">24</span>..<span class="number">26</span>)),
meta_lit(<span class="string">&#39;$&#39;</span>, span(<span class="number">26</span>..<span class="number">28</span>)),
meta_lit(<span class="string">&#39;#&#39;</span>, span(<span class="number">28</span>..<span class="number">30</span>)),
meta_lit(<span class="string">&#39;&amp;&#39;</span>, span(<span class="number">30</span>..<span class="number">32</span>)),
meta_lit(<span class="string">&#39;-&#39;</span>, span(<span class="number">32</span>..<span class="number">34</span>)),
meta_lit(<span class="string">&#39;~&#39;</span>, span(<span class="number">34</span>..<span class="number">36</span>)),
]
))
);
}
<span class="attribute">#[test]
</span><span class="kw">fn </span>parse_ignore_whitespace() {
<span class="comment">// Test that basic whitespace insensitivity works.
</span><span class="kw">let </span>pat = <span class="string">&quot;(?x)a b&quot;</span>;
<span class="macro">assert_eq!</span>(
parser(pat).parse(),
<span class="prelude-val">Ok</span>(concat_with(
nspan(npos(<span class="number">0</span>, <span class="number">1</span>, <span class="number">1</span>), npos(<span class="number">7</span>, <span class="number">1</span>, <span class="number">8</span>)),
<span class="macro">vec!</span>[
flag_set(pat, <span class="number">0</span>..<span class="number">4</span>, ast::Flag::IgnoreWhitespace, <span class="bool-val">false</span>),
lit_with(<span class="string">&#39;a&#39;</span>, nspan(npos(<span class="number">4</span>, <span class="number">1</span>, <span class="number">5</span>), npos(<span class="number">5</span>, <span class="number">1</span>, <span class="number">6</span>))),
lit_with(<span class="string">&#39;b&#39;</span>, nspan(npos(<span class="number">6</span>, <span class="number">1</span>, <span class="number">7</span>), npos(<span class="number">7</span>, <span class="number">1</span>, <span class="number">8</span>))),
]
))
);
<span class="comment">// Test that we can toggle whitespace insensitivity.
</span><span class="kw">let </span>pat = <span class="string">&quot;(?x)a b(?-x)a b&quot;</span>;
<span class="macro">assert_eq!</span>(
parser(pat).parse(),
<span class="prelude-val">Ok</span>(concat_with(
nspan(npos(<span class="number">0</span>, <span class="number">1</span>, <span class="number">1</span>), npos(<span class="number">15</span>, <span class="number">1</span>, <span class="number">16</span>)),
<span class="macro">vec!</span>[
flag_set(pat, <span class="number">0</span>..<span class="number">4</span>, ast::Flag::IgnoreWhitespace, <span class="bool-val">false</span>),
lit_with(<span class="string">&#39;a&#39;</span>, nspan(npos(<span class="number">4</span>, <span class="number">1</span>, <span class="number">5</span>), npos(<span class="number">5</span>, <span class="number">1</span>, <span class="number">6</span>))),
lit_with(<span class="string">&#39;b&#39;</span>, nspan(npos(<span class="number">6</span>, <span class="number">1</span>, <span class="number">7</span>), npos(<span class="number">7</span>, <span class="number">1</span>, <span class="number">8</span>))),
flag_set(pat, <span class="number">7</span>..<span class="number">12</span>, ast::Flag::IgnoreWhitespace, <span class="bool-val">true</span>),
lit_with(<span class="string">&#39;a&#39;</span>, nspan(npos(<span class="number">12</span>, <span class="number">1</span>, <span class="number">13</span>), npos(<span class="number">13</span>, <span class="number">1</span>, <span class="number">14</span>))),
lit_with(<span class="string">&#39; &#39;</span>, nspan(npos(<span class="number">13</span>, <span class="number">1</span>, <span class="number">14</span>), npos(<span class="number">14</span>, <span class="number">1</span>, <span class="number">15</span>))),
lit_with(<span class="string">&#39;b&#39;</span>, nspan(npos(<span class="number">14</span>, <span class="number">1</span>, <span class="number">15</span>), npos(<span class="number">15</span>, <span class="number">1</span>, <span class="number">16</span>))),
]
))
);
<span class="comment">// Test that nesting whitespace insensitive flags works.
</span><span class="kw">let </span>pat = <span class="string">&quot;a (?x:a )a &quot;</span>;
<span class="macro">assert_eq!</span>(
parser(pat).parse(),
<span class="prelude-val">Ok</span>(concat_with(
span_range(pat, <span class="number">0</span>..<span class="number">11</span>),
<span class="macro">vec!</span>[
lit_with(<span class="string">&#39;a&#39;</span>, span_range(pat, <span class="number">0</span>..<span class="number">1</span>)),
lit_with(<span class="string">&#39; &#39;</span>, span_range(pat, <span class="number">1</span>..<span class="number">2</span>)),
Ast::Group(ast::Group {
span: span_range(pat, <span class="number">2</span>..<span class="number">9</span>),
kind: ast::GroupKind::NonCapturing(ast::Flags {
span: span_range(pat, <span class="number">4</span>..<span class="number">5</span>),
items: <span class="macro">vec!</span>[ast::FlagsItem {
span: span_range(pat, <span class="number">4</span>..<span class="number">5</span>),
kind: ast::FlagsItemKind::Flag(
ast::Flag::IgnoreWhitespace
),
},],
}),
ast: Box::new(lit_with(<span class="string">&#39;a&#39;</span>, span_range(pat, <span class="number">6</span>..<span class="number">7</span>))),
}),
lit_with(<span class="string">&#39;a&#39;</span>, span_range(pat, <span class="number">9</span>..<span class="number">10</span>)),
lit_with(<span class="string">&#39; &#39;</span>, span_range(pat, <span class="number">10</span>..<span class="number">11</span>)),
]
))
);
<span class="comment">// Test that whitespace after an opening paren is insignificant.
</span><span class="kw">let </span>pat = <span class="string">&quot;(?x)( ?P&lt;foo&gt; a )&quot;</span>;
<span class="macro">assert_eq!</span>(
parser(pat).parse(),
<span class="prelude-val">Ok</span>(concat_with(
span_range(pat, <span class="number">0</span>..pat.len()),
<span class="macro">vec!</span>[
flag_set(pat, <span class="number">0</span>..<span class="number">4</span>, ast::Flag::IgnoreWhitespace, <span class="bool-val">false</span>),
Ast::Group(ast::Group {
span: span_range(pat, <span class="number">4</span>..pat.len()),
kind: ast::GroupKind::CaptureName {
starts_with_p: <span class="bool-val">true</span>,
name: ast::CaptureName {
span: span_range(pat, <span class="number">9</span>..<span class="number">12</span>),
name: s(<span class="string">&quot;foo&quot;</span>),
index: <span class="number">1</span>,
}
},
ast: Box::new(lit_with(<span class="string">&#39;a&#39;</span>, span_range(pat, <span class="number">14</span>..<span class="number">15</span>))),
}),
]
))
);
<span class="kw">let </span>pat = <span class="string">&quot;(?x)( a )&quot;</span>;
<span class="macro">assert_eq!</span>(
parser(pat).parse(),
<span class="prelude-val">Ok</span>(concat_with(
span_range(pat, <span class="number">0</span>..pat.len()),
<span class="macro">vec!</span>[
flag_set(pat, <span class="number">0</span>..<span class="number">4</span>, ast::Flag::IgnoreWhitespace, <span class="bool-val">false</span>),
Ast::Group(ast::Group {
span: span_range(pat, <span class="number">4</span>..pat.len()),
kind: ast::GroupKind::CaptureIndex(<span class="number">1</span>),
ast: Box::new(lit_with(<span class="string">&#39;a&#39;</span>, span_range(pat, <span class="number">7</span>..<span class="number">8</span>))),
}),
]
))
);
<span class="kw">let </span>pat = <span class="string">&quot;(?x)( ?: a )&quot;</span>;
<span class="macro">assert_eq!</span>(
parser(pat).parse(),
<span class="prelude-val">Ok</span>(concat_with(
span_range(pat, <span class="number">0</span>..pat.len()),
<span class="macro">vec!</span>[
flag_set(pat, <span class="number">0</span>..<span class="number">4</span>, ast::Flag::IgnoreWhitespace, <span class="bool-val">false</span>),
Ast::Group(ast::Group {
span: span_range(pat, <span class="number">4</span>..pat.len()),
kind: ast::GroupKind::NonCapturing(ast::Flags {
span: span_range(pat, <span class="number">8</span>..<span class="number">8</span>),
items: <span class="macro">vec!</span>[],
}),
ast: Box::new(lit_with(<span class="string">&#39;a&#39;</span>, span_range(pat, <span class="number">11</span>..<span class="number">12</span>))),
}),
]
))
);
<span class="kw">let </span>pat = <span class="string">r&quot;(?x)\x { 53 }&quot;</span>;
<span class="macro">assert_eq!</span>(
parser(pat).parse(),
<span class="prelude-val">Ok</span>(concat_with(
span_range(pat, <span class="number">0</span>..pat.len()),
<span class="macro">vec!</span>[
flag_set(pat, <span class="number">0</span>..<span class="number">4</span>, ast::Flag::IgnoreWhitespace, <span class="bool-val">false</span>),
Ast::Literal(ast::Literal {
span: span(<span class="number">4</span>..<span class="number">13</span>),
kind: ast::LiteralKind::HexBrace(
ast::HexLiteralKind::X
),
c: <span class="string">&#39;S&#39;</span>,
}),
]
))
);
<span class="comment">// Test that whitespace after an escape is OK.
</span><span class="kw">let </span>pat = <span class="string">r&quot;(?x)\ &quot;</span>;
<span class="macro">assert_eq!</span>(
parser(pat).parse(),
<span class="prelude-val">Ok</span>(concat_with(
span_range(pat, <span class="number">0</span>..pat.len()),
<span class="macro">vec!</span>[
flag_set(pat, <span class="number">0</span>..<span class="number">4</span>, ast::Flag::IgnoreWhitespace, <span class="bool-val">false</span>),
Ast::Literal(ast::Literal {
span: span_range(pat, <span class="number">4</span>..<span class="number">6</span>),
kind: ast::LiteralKind::Superfluous,
c: <span class="string">&#39; &#39;</span>,
}),
]
))
);
}
<span class="attribute">#[test]
</span><span class="kw">fn </span>parse_newlines() {
<span class="kw">let </span>pat = <span class="string">&quot;.\n.&quot;</span>;
<span class="macro">assert_eq!</span>(
parser(pat).parse(),
<span class="prelude-val">Ok</span>(concat_with(
span_range(pat, <span class="number">0</span>..<span class="number">3</span>),
<span class="macro">vec!</span>[
Ast::Dot(span_range(pat, <span class="number">0</span>..<span class="number">1</span>)),
lit_with(<span class="string">&#39;\n&#39;</span>, span_range(pat, <span class="number">1</span>..<span class="number">2</span>)),
Ast::Dot(span_range(pat, <span class="number">2</span>..<span class="number">3</span>)),
]
))
);
<span class="kw">let </span>pat = <span class="string">&quot;foobar\nbaz\nquux\n&quot;</span>;
<span class="macro">assert_eq!</span>(
parser(pat).parse(),
<span class="prelude-val">Ok</span>(concat_with(
span_range(pat, <span class="number">0</span>..pat.len()),
<span class="macro">vec!</span>[
lit_with(<span class="string">&#39;f&#39;</span>, nspan(npos(<span class="number">0</span>, <span class="number">1</span>, <span class="number">1</span>), npos(<span class="number">1</span>, <span class="number">1</span>, <span class="number">2</span>))),
lit_with(<span class="string">&#39;o&#39;</span>, nspan(npos(<span class="number">1</span>, <span class="number">1</span>, <span class="number">2</span>), npos(<span class="number">2</span>, <span class="number">1</span>, <span class="number">3</span>))),
lit_with(<span class="string">&#39;o&#39;</span>, nspan(npos(<span class="number">2</span>, <span class="number">1</span>, <span class="number">3</span>), npos(<span class="number">3</span>, <span class="number">1</span>, <span class="number">4</span>))),
lit_with(<span class="string">&#39;b&#39;</span>, nspan(npos(<span class="number">3</span>, <span class="number">1</span>, <span class="number">4</span>), npos(<span class="number">4</span>, <span class="number">1</span>, <span class="number">5</span>))),
lit_with(<span class="string">&#39;a&#39;</span>, nspan(npos(<span class="number">4</span>, <span class="number">1</span>, <span class="number">5</span>), npos(<span class="number">5</span>, <span class="number">1</span>, <span class="number">6</span>))),
lit_with(<span class="string">&#39;r&#39;</span>, nspan(npos(<span class="number">5</span>, <span class="number">1</span>, <span class="number">6</span>), npos(<span class="number">6</span>, <span class="number">1</span>, <span class="number">7</span>))),
lit_with(<span class="string">&#39;\n&#39;</span>, nspan(npos(<span class="number">6</span>, <span class="number">1</span>, <span class="number">7</span>), npos(<span class="number">7</span>, <span class="number">2</span>, <span class="number">1</span>))),
lit_with(<span class="string">&#39;b&#39;</span>, nspan(npos(<span class="number">7</span>, <span class="number">2</span>, <span class="number">1</span>), npos(<span class="number">8</span>, <span class="number">2</span>, <span class="number">2</span>))),
lit_with(<span class="string">&#39;a&#39;</span>, nspan(npos(<span class="number">8</span>, <span class="number">2</span>, <span class="number">2</span>), npos(<span class="number">9</span>, <span class="number">2</span>, <span class="number">3</span>))),
lit_with(<span class="string">&#39;z&#39;</span>, nspan(npos(<span class="number">9</span>, <span class="number">2</span>, <span class="number">3</span>), npos(<span class="number">10</span>, <span class="number">2</span>, <span class="number">4</span>))),
lit_with(<span class="string">&#39;\n&#39;</span>, nspan(npos(<span class="number">10</span>, <span class="number">2</span>, <span class="number">4</span>), npos(<span class="number">11</span>, <span class="number">3</span>, <span class="number">1</span>))),
lit_with(<span class="string">&#39;q&#39;</span>, nspan(npos(<span class="number">11</span>, <span class="number">3</span>, <span class="number">1</span>), npos(<span class="number">12</span>, <span class="number">3</span>, <span class="number">2</span>))),
lit_with(<span class="string">&#39;u&#39;</span>, nspan(npos(<span class="number">12</span>, <span class="number">3</span>, <span class="number">2</span>), npos(<span class="number">13</span>, <span class="number">3</span>, <span class="number">3</span>))),
lit_with(<span class="string">&#39;u&#39;</span>, nspan(npos(<span class="number">13</span>, <span class="number">3</span>, <span class="number">3</span>), npos(<span class="number">14</span>, <span class="number">3</span>, <span class="number">4</span>))),
lit_with(<span class="string">&#39;x&#39;</span>, nspan(npos(<span class="number">14</span>, <span class="number">3</span>, <span class="number">4</span>), npos(<span class="number">15</span>, <span class="number">3</span>, <span class="number">5</span>))),
lit_with(<span class="string">&#39;\n&#39;</span>, nspan(npos(<span class="number">15</span>, <span class="number">3</span>, <span class="number">5</span>), npos(<span class="number">16</span>, <span class="number">4</span>, <span class="number">1</span>))),
]
))
);
}
<span class="attribute">#[test]
</span><span class="kw">fn </span>parse_uncounted_repetition() {
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;a*&quot;</span>).parse(),
<span class="prelude-val">Ok</span>(Ast::Repetition(ast::Repetition {
span: span(<span class="number">0</span>..<span class="number">2</span>),
op: ast::RepetitionOp {
span: span(<span class="number">1</span>..<span class="number">2</span>),
kind: ast::RepetitionKind::ZeroOrMore,
},
greedy: <span class="bool-val">true</span>,
ast: Box::new(lit(<span class="string">&#39;a&#39;</span>, <span class="number">0</span>)),
}))
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;a+&quot;</span>).parse(),
<span class="prelude-val">Ok</span>(Ast::Repetition(ast::Repetition {
span: span(<span class="number">0</span>..<span class="number">2</span>),
op: ast::RepetitionOp {
span: span(<span class="number">1</span>..<span class="number">2</span>),
kind: ast::RepetitionKind::OneOrMore,
},
greedy: <span class="bool-val">true</span>,
ast: Box::new(lit(<span class="string">&#39;a&#39;</span>, <span class="number">0</span>)),
}))
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;a?&quot;</span>).parse(),
<span class="prelude-val">Ok</span>(Ast::Repetition(ast::Repetition {
span: span(<span class="number">0</span>..<span class="number">2</span>),
op: ast::RepetitionOp {
span: span(<span class="number">1</span>..<span class="number">2</span>),
kind: ast::RepetitionKind::ZeroOrOne,
},
greedy: <span class="bool-val">true</span>,
ast: Box::new(lit(<span class="string">&#39;a&#39;</span>, <span class="number">0</span>)),
}))
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;a??&quot;</span>).parse(),
<span class="prelude-val">Ok</span>(Ast::Repetition(ast::Repetition {
span: span(<span class="number">0</span>..<span class="number">3</span>),
op: ast::RepetitionOp {
span: span(<span class="number">1</span>..<span class="number">3</span>),
kind: ast::RepetitionKind::ZeroOrOne,
},
greedy: <span class="bool-val">false</span>,
ast: Box::new(lit(<span class="string">&#39;a&#39;</span>, <span class="number">0</span>)),
}))
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;a?&quot;</span>).parse(),
<span class="prelude-val">Ok</span>(Ast::Repetition(ast::Repetition {
span: span(<span class="number">0</span>..<span class="number">2</span>),
op: ast::RepetitionOp {
span: span(<span class="number">1</span>..<span class="number">2</span>),
kind: ast::RepetitionKind::ZeroOrOne,
},
greedy: <span class="bool-val">true</span>,
ast: Box::new(lit(<span class="string">&#39;a&#39;</span>, <span class="number">0</span>)),
}))
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;a?b&quot;</span>).parse(),
<span class="prelude-val">Ok</span>(concat(
<span class="number">0</span>..<span class="number">3</span>,
<span class="macro">vec!</span>[
Ast::Repetition(ast::Repetition {
span: span(<span class="number">0</span>..<span class="number">2</span>),
op: ast::RepetitionOp {
span: span(<span class="number">1</span>..<span class="number">2</span>),
kind: ast::RepetitionKind::ZeroOrOne,
},
greedy: <span class="bool-val">true</span>,
ast: Box::new(lit(<span class="string">&#39;a&#39;</span>, <span class="number">0</span>)),
}),
lit(<span class="string">&#39;b&#39;</span>, <span class="number">2</span>),
]
))
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;a??b&quot;</span>).parse(),
<span class="prelude-val">Ok</span>(concat(
<span class="number">0</span>..<span class="number">4</span>,
<span class="macro">vec!</span>[
Ast::Repetition(ast::Repetition {
span: span(<span class="number">0</span>..<span class="number">3</span>),
op: ast::RepetitionOp {
span: span(<span class="number">1</span>..<span class="number">3</span>),
kind: ast::RepetitionKind::ZeroOrOne,
},
greedy: <span class="bool-val">false</span>,
ast: Box::new(lit(<span class="string">&#39;a&#39;</span>, <span class="number">0</span>)),
}),
lit(<span class="string">&#39;b&#39;</span>, <span class="number">3</span>),
]
))
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;ab?&quot;</span>).parse(),
<span class="prelude-val">Ok</span>(concat(
<span class="number">0</span>..<span class="number">3</span>,
<span class="macro">vec!</span>[
lit(<span class="string">&#39;a&#39;</span>, <span class="number">0</span>),
Ast::Repetition(ast::Repetition {
span: span(<span class="number">1</span>..<span class="number">3</span>),
op: ast::RepetitionOp {
span: span(<span class="number">2</span>..<span class="number">3</span>),
kind: ast::RepetitionKind::ZeroOrOne,
},
greedy: <span class="bool-val">true</span>,
ast: Box::new(lit(<span class="string">&#39;b&#39;</span>, <span class="number">1</span>)),
}),
]
))
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;(ab)?&quot;</span>).parse(),
<span class="prelude-val">Ok</span>(Ast::Repetition(ast::Repetition {
span: span(<span class="number">0</span>..<span class="number">5</span>),
op: ast::RepetitionOp {
span: span(<span class="number">4</span>..<span class="number">5</span>),
kind: ast::RepetitionKind::ZeroOrOne,
},
greedy: <span class="bool-val">true</span>,
ast: Box::new(group(
<span class="number">0</span>..<span class="number">4</span>,
<span class="number">1</span>,
concat(<span class="number">1</span>..<span class="number">3</span>, <span class="macro">vec!</span>[lit(<span class="string">&#39;a&#39;</span>, <span class="number">1</span>), lit(<span class="string">&#39;b&#39;</span>, <span class="number">2</span>),])
)),
}))
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;|a?&quot;</span>).parse(),
<span class="prelude-val">Ok</span>(alt(
<span class="number">0</span>..<span class="number">3</span>,
<span class="macro">vec!</span>[
Ast::Empty(span(<span class="number">0</span>..<span class="number">0</span>)),
Ast::Repetition(ast::Repetition {
span: span(<span class="number">1</span>..<span class="number">3</span>),
op: ast::RepetitionOp {
span: span(<span class="number">2</span>..<span class="number">3</span>),
kind: ast::RepetitionKind::ZeroOrOne,
},
greedy: <span class="bool-val">true</span>,
ast: Box::new(lit(<span class="string">&#39;a&#39;</span>, <span class="number">1</span>)),
}),
]
))
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;*&quot;</span>).parse().unwrap_err(),
TestError {
span: span(<span class="number">0</span>..<span class="number">0</span>),
kind: ast::ErrorKind::RepetitionMissing,
}
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;(?i)*&quot;</span>).parse().unwrap_err(),
TestError {
span: span(<span class="number">4</span>..<span class="number">4</span>),
kind: ast::ErrorKind::RepetitionMissing,
}
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;(*)&quot;</span>).parse().unwrap_err(),
TestError {
span: span(<span class="number">1</span>..<span class="number">1</span>),
kind: ast::ErrorKind::RepetitionMissing,
}
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;(?:?)&quot;</span>).parse().unwrap_err(),
TestError {
span: span(<span class="number">3</span>..<span class="number">3</span>),
kind: ast::ErrorKind::RepetitionMissing,
}
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;+&quot;</span>).parse().unwrap_err(),
TestError {
span: span(<span class="number">0</span>..<span class="number">0</span>),
kind: ast::ErrorKind::RepetitionMissing,
}
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;?&quot;</span>).parse().unwrap_err(),
TestError {
span: span(<span class="number">0</span>..<span class="number">0</span>),
kind: ast::ErrorKind::RepetitionMissing,
}
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;(?)&quot;</span>).parse().unwrap_err(),
TestError {
span: span(<span class="number">1</span>..<span class="number">1</span>),
kind: ast::ErrorKind::RepetitionMissing,
}
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;|*&quot;</span>).parse().unwrap_err(),
TestError {
span: span(<span class="number">1</span>..<span class="number">1</span>),
kind: ast::ErrorKind::RepetitionMissing,
}
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;|+&quot;</span>).parse().unwrap_err(),
TestError {
span: span(<span class="number">1</span>..<span class="number">1</span>),
kind: ast::ErrorKind::RepetitionMissing,
}
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;|?&quot;</span>).parse().unwrap_err(),
TestError {
span: span(<span class="number">1</span>..<span class="number">1</span>),
kind: ast::ErrorKind::RepetitionMissing,
}
);
}
<span class="attribute">#[test]
</span><span class="kw">fn </span>parse_counted_repetition() {
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;a{5}&quot;</span>).parse(),
<span class="prelude-val">Ok</span>(Ast::Repetition(ast::Repetition {
span: span(<span class="number">0</span>..<span class="number">4</span>),
op: ast::RepetitionOp {
span: span(<span class="number">1</span>..<span class="number">4</span>),
kind: ast::RepetitionKind::Range(
ast::RepetitionRange::Exactly(<span class="number">5</span>)
),
},
greedy: <span class="bool-val">true</span>,
ast: Box::new(lit(<span class="string">&#39;a&#39;</span>, <span class="number">0</span>)),
}))
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;a{5,}&quot;</span>).parse(),
<span class="prelude-val">Ok</span>(Ast::Repetition(ast::Repetition {
span: span(<span class="number">0</span>..<span class="number">5</span>),
op: ast::RepetitionOp {
span: span(<span class="number">1</span>..<span class="number">5</span>),
kind: ast::RepetitionKind::Range(
ast::RepetitionRange::AtLeast(<span class="number">5</span>)
),
},
greedy: <span class="bool-val">true</span>,
ast: Box::new(lit(<span class="string">&#39;a&#39;</span>, <span class="number">0</span>)),
}))
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;a{5,9}&quot;</span>).parse(),
<span class="prelude-val">Ok</span>(Ast::Repetition(ast::Repetition {
span: span(<span class="number">0</span>..<span class="number">6</span>),
op: ast::RepetitionOp {
span: span(<span class="number">1</span>..<span class="number">6</span>),
kind: ast::RepetitionKind::Range(
ast::RepetitionRange::Bounded(<span class="number">5</span>, <span class="number">9</span>)
),
},
greedy: <span class="bool-val">true</span>,
ast: Box::new(lit(<span class="string">&#39;a&#39;</span>, <span class="number">0</span>)),
}))
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;a{5}?&quot;</span>).parse(),
<span class="prelude-val">Ok</span>(Ast::Repetition(ast::Repetition {
span: span(<span class="number">0</span>..<span class="number">5</span>),
op: ast::RepetitionOp {
span: span(<span class="number">1</span>..<span class="number">5</span>),
kind: ast::RepetitionKind::Range(
ast::RepetitionRange::Exactly(<span class="number">5</span>)
),
},
greedy: <span class="bool-val">false</span>,
ast: Box::new(lit(<span class="string">&#39;a&#39;</span>, <span class="number">0</span>)),
}))
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;ab{5}&quot;</span>).parse(),
<span class="prelude-val">Ok</span>(concat(
<span class="number">0</span>..<span class="number">5</span>,
<span class="macro">vec!</span>[
lit(<span class="string">&#39;a&#39;</span>, <span class="number">0</span>),
Ast::Repetition(ast::Repetition {
span: span(<span class="number">1</span>..<span class="number">5</span>),
op: ast::RepetitionOp {
span: span(<span class="number">2</span>..<span class="number">5</span>),
kind: ast::RepetitionKind::Range(
ast::RepetitionRange::Exactly(<span class="number">5</span>)
),
},
greedy: <span class="bool-val">true</span>,
ast: Box::new(lit(<span class="string">&#39;b&#39;</span>, <span class="number">1</span>)),
}),
]
))
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;ab{5}c&quot;</span>).parse(),
<span class="prelude-val">Ok</span>(concat(
<span class="number">0</span>..<span class="number">6</span>,
<span class="macro">vec!</span>[
lit(<span class="string">&#39;a&#39;</span>, <span class="number">0</span>),
Ast::Repetition(ast::Repetition {
span: span(<span class="number">1</span>..<span class="number">5</span>),
op: ast::RepetitionOp {
span: span(<span class="number">2</span>..<span class="number">5</span>),
kind: ast::RepetitionKind::Range(
ast::RepetitionRange::Exactly(<span class="number">5</span>)
),
},
greedy: <span class="bool-val">true</span>,
ast: Box::new(lit(<span class="string">&#39;b&#39;</span>, <span class="number">1</span>)),
}),
lit(<span class="string">&#39;c&#39;</span>, <span class="number">5</span>),
]
))
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;a{ 5 }&quot;</span>).parse(),
<span class="prelude-val">Ok</span>(Ast::Repetition(ast::Repetition {
span: span(<span class="number">0</span>..<span class="number">6</span>),
op: ast::RepetitionOp {
span: span(<span class="number">1</span>..<span class="number">6</span>),
kind: ast::RepetitionKind::Range(
ast::RepetitionRange::Exactly(<span class="number">5</span>)
),
},
greedy: <span class="bool-val">true</span>,
ast: Box::new(lit(<span class="string">&#39;a&#39;</span>, <span class="number">0</span>)),
}))
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;a{ 5 , 9 }&quot;</span>).parse(),
<span class="prelude-val">Ok</span>(Ast::Repetition(ast::Repetition {
span: span(<span class="number">0</span>..<span class="number">10</span>),
op: ast::RepetitionOp {
span: span(<span class="number">1</span>..<span class="number">10</span>),
kind: ast::RepetitionKind::Range(
ast::RepetitionRange::Bounded(<span class="number">5</span>, <span class="number">9</span>)
),
},
greedy: <span class="bool-val">true</span>,
ast: Box::new(lit(<span class="string">&#39;a&#39;</span>, <span class="number">0</span>)),
}))
);
<span class="macro">assert_eq!</span>(
parser_ignore_whitespace(<span class="string">r&quot;a{5,9} ?&quot;</span>).parse(),
<span class="prelude-val">Ok</span>(Ast::Repetition(ast::Repetition {
span: span(<span class="number">0</span>..<span class="number">8</span>),
op: ast::RepetitionOp {
span: span(<span class="number">1</span>..<span class="number">8</span>),
kind: ast::RepetitionKind::Range(
ast::RepetitionRange::Bounded(<span class="number">5</span>, <span class="number">9</span>)
),
},
greedy: <span class="bool-val">false</span>,
ast: Box::new(lit(<span class="string">&#39;a&#39;</span>, <span class="number">0</span>)),
}))
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;(?i){0}&quot;</span>).parse().unwrap_err(),
TestError {
span: span(<span class="number">4</span>..<span class="number">4</span>),
kind: ast::ErrorKind::RepetitionMissing,
}
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;(?m){1,1}&quot;</span>).parse().unwrap_err(),
TestError {
span: span(<span class="number">4</span>..<span class="number">4</span>),
kind: ast::ErrorKind::RepetitionMissing,
}
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;a{]}&quot;</span>).parse().unwrap_err(),
TestError {
span: span(<span class="number">2</span>..<span class="number">2</span>),
kind: ast::ErrorKind::RepetitionCountDecimalEmpty,
}
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;a{1,]}&quot;</span>).parse().unwrap_err(),
TestError {
span: span(<span class="number">4</span>..<span class="number">4</span>),
kind: ast::ErrorKind::RepetitionCountDecimalEmpty,
}
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;a{&quot;</span>).parse().unwrap_err(),
TestError {
span: span(<span class="number">1</span>..<span class="number">2</span>),
kind: ast::ErrorKind::RepetitionCountUnclosed,
}
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;a{}&quot;</span>).parse().unwrap_err(),
TestError {
span: span(<span class="number">2</span>..<span class="number">2</span>),
kind: ast::ErrorKind::RepetitionCountDecimalEmpty,
}
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;a{a&quot;</span>).parse().unwrap_err(),
TestError {
span: span(<span class="number">2</span>..<span class="number">2</span>),
kind: ast::ErrorKind::RepetitionCountDecimalEmpty,
}
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;a{9999999999}&quot;</span>).parse().unwrap_err(),
TestError {
span: span(<span class="number">2</span>..<span class="number">12</span>),
kind: ast::ErrorKind::DecimalInvalid,
}
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;a{9&quot;</span>).parse().unwrap_err(),
TestError {
span: span(<span class="number">1</span>..<span class="number">3</span>),
kind: ast::ErrorKind::RepetitionCountUnclosed,
}
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;a{9,a&quot;</span>).parse().unwrap_err(),
TestError {
span: span(<span class="number">4</span>..<span class="number">4</span>),
kind: ast::ErrorKind::RepetitionCountDecimalEmpty,
}
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;a{9,9999999999}&quot;</span>).parse().unwrap_err(),
TestError {
span: span(<span class="number">4</span>..<span class="number">14</span>),
kind: ast::ErrorKind::DecimalInvalid,
}
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;a{9,&quot;</span>).parse().unwrap_err(),
TestError {
span: span(<span class="number">1</span>..<span class="number">4</span>),
kind: ast::ErrorKind::RepetitionCountUnclosed,
}
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;a{9,11&quot;</span>).parse().unwrap_err(),
TestError {
span: span(<span class="number">1</span>..<span class="number">6</span>),
kind: ast::ErrorKind::RepetitionCountUnclosed,
}
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;a{2,1}&quot;</span>).parse().unwrap_err(),
TestError {
span: span(<span class="number">1</span>..<span class="number">6</span>),
kind: ast::ErrorKind::RepetitionCountInvalid,
}
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;{5}&quot;</span>).parse().unwrap_err(),
TestError {
span: span(<span class="number">0</span>..<span class="number">0</span>),
kind: ast::ErrorKind::RepetitionMissing,
}
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;|{5}&quot;</span>).parse().unwrap_err(),
TestError {
span: span(<span class="number">1</span>..<span class="number">1</span>),
kind: ast::ErrorKind::RepetitionMissing,
}
);
}
<span class="attribute">#[test]
</span><span class="kw">fn </span>parse_alternate() {
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;a|b&quot;</span>).parse(),
<span class="prelude-val">Ok</span>(Ast::Alternation(ast::Alternation {
span: span(<span class="number">0</span>..<span class="number">3</span>),
asts: <span class="macro">vec!</span>[lit(<span class="string">&#39;a&#39;</span>, <span class="number">0</span>), lit(<span class="string">&#39;b&#39;</span>, <span class="number">2</span>)],
}))
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;(a|b)&quot;</span>).parse(),
<span class="prelude-val">Ok</span>(group(
<span class="number">0</span>..<span class="number">5</span>,
<span class="number">1</span>,
Ast::Alternation(ast::Alternation {
span: span(<span class="number">1</span>..<span class="number">4</span>),
asts: <span class="macro">vec!</span>[lit(<span class="string">&#39;a&#39;</span>, <span class="number">1</span>), lit(<span class="string">&#39;b&#39;</span>, <span class="number">3</span>)],
})
))
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;a|b|c&quot;</span>).parse(),
<span class="prelude-val">Ok</span>(Ast::Alternation(ast::Alternation {
span: span(<span class="number">0</span>..<span class="number">5</span>),
asts: <span class="macro">vec!</span>[lit(<span class="string">&#39;a&#39;</span>, <span class="number">0</span>), lit(<span class="string">&#39;b&#39;</span>, <span class="number">2</span>), lit(<span class="string">&#39;c&#39;</span>, <span class="number">4</span>)],
}))
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;ax|by|cz&quot;</span>).parse(),
<span class="prelude-val">Ok</span>(Ast::Alternation(ast::Alternation {
span: span(<span class="number">0</span>..<span class="number">8</span>),
asts: <span class="macro">vec!</span>[
concat(<span class="number">0</span>..<span class="number">2</span>, <span class="macro">vec!</span>[lit(<span class="string">&#39;a&#39;</span>, <span class="number">0</span>), lit(<span class="string">&#39;x&#39;</span>, <span class="number">1</span>)]),
concat(<span class="number">3</span>..<span class="number">5</span>, <span class="macro">vec!</span>[lit(<span class="string">&#39;b&#39;</span>, <span class="number">3</span>), lit(<span class="string">&#39;y&#39;</span>, <span class="number">4</span>)]),
concat(<span class="number">6</span>..<span class="number">8</span>, <span class="macro">vec!</span>[lit(<span class="string">&#39;c&#39;</span>, <span class="number">6</span>), lit(<span class="string">&#39;z&#39;</span>, <span class="number">7</span>)]),
],
}))
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;(ax|by|cz)&quot;</span>).parse(),
<span class="prelude-val">Ok</span>(group(
<span class="number">0</span>..<span class="number">10</span>,
<span class="number">1</span>,
Ast::Alternation(ast::Alternation {
span: span(<span class="number">1</span>..<span class="number">9</span>),
asts: <span class="macro">vec!</span>[
concat(<span class="number">1</span>..<span class="number">3</span>, <span class="macro">vec!</span>[lit(<span class="string">&#39;a&#39;</span>, <span class="number">1</span>), lit(<span class="string">&#39;x&#39;</span>, <span class="number">2</span>)]),
concat(<span class="number">4</span>..<span class="number">6</span>, <span class="macro">vec!</span>[lit(<span class="string">&#39;b&#39;</span>, <span class="number">4</span>), lit(<span class="string">&#39;y&#39;</span>, <span class="number">5</span>)]),
concat(<span class="number">7</span>..<span class="number">9</span>, <span class="macro">vec!</span>[lit(<span class="string">&#39;c&#39;</span>, <span class="number">7</span>), lit(<span class="string">&#39;z&#39;</span>, <span class="number">8</span>)]),
],
})
))
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;(ax|(by|(cz)))&quot;</span>).parse(),
<span class="prelude-val">Ok</span>(group(
<span class="number">0</span>..<span class="number">14</span>,
<span class="number">1</span>,
alt(
<span class="number">1</span>..<span class="number">13</span>,
<span class="macro">vec!</span>[
concat(<span class="number">1</span>..<span class="number">3</span>, <span class="macro">vec!</span>[lit(<span class="string">&#39;a&#39;</span>, <span class="number">1</span>), lit(<span class="string">&#39;x&#39;</span>, <span class="number">2</span>)]),
group(
<span class="number">4</span>..<span class="number">13</span>,
<span class="number">2</span>,
alt(
<span class="number">5</span>..<span class="number">12</span>,
<span class="macro">vec!</span>[
concat(
<span class="number">5</span>..<span class="number">7</span>,
<span class="macro">vec!</span>[lit(<span class="string">&#39;b&#39;</span>, <span class="number">5</span>), lit(<span class="string">&#39;y&#39;</span>, <span class="number">6</span>)]
),
group(
<span class="number">8</span>..<span class="number">12</span>,
<span class="number">3</span>,
concat(
<span class="number">9</span>..<span class="number">11</span>,
<span class="macro">vec!</span>[lit(<span class="string">&#39;c&#39;</span>, <span class="number">9</span>), lit(<span class="string">&#39;z&#39;</span>, <span class="number">10</span>),]
)
),
]
)
),
]
)
))
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;|&quot;</span>).parse(),
<span class="prelude-val">Ok</span>(alt(
<span class="number">0</span>..<span class="number">1</span>,
<span class="macro">vec!</span>[Ast::Empty(span(<span class="number">0</span>..<span class="number">0</span>)), Ast::Empty(span(<span class="number">1</span>..<span class="number">1</span>)),]
))
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;||&quot;</span>).parse(),
<span class="prelude-val">Ok</span>(alt(
<span class="number">0</span>..<span class="number">2</span>,
<span class="macro">vec!</span>[
Ast::Empty(span(<span class="number">0</span>..<span class="number">0</span>)),
Ast::Empty(span(<span class="number">1</span>..<span class="number">1</span>)),
Ast::Empty(span(<span class="number">2</span>..<span class="number">2</span>)),
]
))
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;a|&quot;</span>).parse(),
<span class="prelude-val">Ok</span>(alt(<span class="number">0</span>..<span class="number">2</span>, <span class="macro">vec!</span>[lit(<span class="string">&#39;a&#39;</span>, <span class="number">0</span>), Ast::Empty(span(<span class="number">2</span>..<span class="number">2</span>)),]))
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;|a&quot;</span>).parse(),
<span class="prelude-val">Ok</span>(alt(<span class="number">0</span>..<span class="number">2</span>, <span class="macro">vec!</span>[Ast::Empty(span(<span class="number">0</span>..<span class="number">0</span>)), lit(<span class="string">&#39;a&#39;</span>, <span class="number">1</span>),]))
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;(|)&quot;</span>).parse(),
<span class="prelude-val">Ok</span>(group(
<span class="number">0</span>..<span class="number">3</span>,
<span class="number">1</span>,
alt(
<span class="number">1</span>..<span class="number">2</span>,
<span class="macro">vec!</span>[Ast::Empty(span(<span class="number">1</span>..<span class="number">1</span>)), Ast::Empty(span(<span class="number">2</span>..<span class="number">2</span>)),]
)
))
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;(a|)&quot;</span>).parse(),
<span class="prelude-val">Ok</span>(group(
<span class="number">0</span>..<span class="number">4</span>,
<span class="number">1</span>,
alt(<span class="number">1</span>..<span class="number">3</span>, <span class="macro">vec!</span>[lit(<span class="string">&#39;a&#39;</span>, <span class="number">1</span>), Ast::Empty(span(<span class="number">3</span>..<span class="number">3</span>)),])
))
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;(|a)&quot;</span>).parse(),
<span class="prelude-val">Ok</span>(group(
<span class="number">0</span>..<span class="number">4</span>,
<span class="number">1</span>,
alt(<span class="number">1</span>..<span class="number">3</span>, <span class="macro">vec!</span>[Ast::Empty(span(<span class="number">1</span>..<span class="number">1</span>)), lit(<span class="string">&#39;a&#39;</span>, <span class="number">2</span>),])
))
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;a|b)&quot;</span>).parse().unwrap_err(),
TestError {
span: span(<span class="number">3</span>..<span class="number">4</span>),
kind: ast::ErrorKind::GroupUnopened,
}
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;(a|b&quot;</span>).parse().unwrap_err(),
TestError {
span: span(<span class="number">0</span>..<span class="number">1</span>),
kind: ast::ErrorKind::GroupUnclosed,
}
);
}
<span class="attribute">#[test]
</span><span class="kw">fn </span>parse_unsupported_lookaround() {
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;(?=a)&quot;</span>).parse().unwrap_err(),
TestError {
span: span(<span class="number">0</span>..<span class="number">3</span>),
kind: ast::ErrorKind::UnsupportedLookAround,
}
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;(?!a)&quot;</span>).parse().unwrap_err(),
TestError {
span: span(<span class="number">0</span>..<span class="number">3</span>),
kind: ast::ErrorKind::UnsupportedLookAround,
}
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;(?&lt;=a)&quot;</span>).parse().unwrap_err(),
TestError {
span: span(<span class="number">0</span>..<span class="number">4</span>),
kind: ast::ErrorKind::UnsupportedLookAround,
}
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;(?&lt;!a)&quot;</span>).parse().unwrap_err(),
TestError {
span: span(<span class="number">0</span>..<span class="number">4</span>),
kind: ast::ErrorKind::UnsupportedLookAround,
}
);
}
<span class="attribute">#[test]
</span><span class="kw">fn </span>parse_group() {
<span class="macro">assert_eq!</span>(
parser(<span class="string">&quot;(?i)&quot;</span>).parse(),
<span class="prelude-val">Ok</span>(Ast::Flags(ast::SetFlags {
span: span(<span class="number">0</span>..<span class="number">4</span>),
flags: ast::Flags {
span: span(<span class="number">2</span>..<span class="number">3</span>),
items: <span class="macro">vec!</span>[ast::FlagsItem {
span: span(<span class="number">2</span>..<span class="number">3</span>),
kind: ast::FlagsItemKind::Flag(
ast::Flag::CaseInsensitive
),
}],
},
}))
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">&quot;(?iU)&quot;</span>).parse(),
<span class="prelude-val">Ok</span>(Ast::Flags(ast::SetFlags {
span: span(<span class="number">0</span>..<span class="number">5</span>),
flags: ast::Flags {
span: span(<span class="number">2</span>..<span class="number">4</span>),
items: <span class="macro">vec!</span>[
ast::FlagsItem {
span: span(<span class="number">2</span>..<span class="number">3</span>),
kind: ast::FlagsItemKind::Flag(
ast::Flag::CaseInsensitive
),
},
ast::FlagsItem {
span: span(<span class="number">3</span>..<span class="number">4</span>),
kind: ast::FlagsItemKind::Flag(
ast::Flag::SwapGreed
),
},
],
},
}))
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">&quot;(?i-U)&quot;</span>).parse(),
<span class="prelude-val">Ok</span>(Ast::Flags(ast::SetFlags {
span: span(<span class="number">0</span>..<span class="number">6</span>),
flags: ast::Flags {
span: span(<span class="number">2</span>..<span class="number">5</span>),
items: <span class="macro">vec!</span>[
ast::FlagsItem {
span: span(<span class="number">2</span>..<span class="number">3</span>),
kind: ast::FlagsItemKind::Flag(
ast::Flag::CaseInsensitive
),
},
ast::FlagsItem {
span: span(<span class="number">3</span>..<span class="number">4</span>),
kind: ast::FlagsItemKind::Negation,
},
ast::FlagsItem {
span: span(<span class="number">4</span>..<span class="number">5</span>),
kind: ast::FlagsItemKind::Flag(
ast::Flag::SwapGreed
),
},
],
},
}))
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">&quot;()&quot;</span>).parse(),
<span class="prelude-val">Ok</span>(Ast::Group(ast::Group {
span: span(<span class="number">0</span>..<span class="number">2</span>),
kind: ast::GroupKind::CaptureIndex(<span class="number">1</span>),
ast: Box::new(Ast::Empty(span(<span class="number">1</span>..<span class="number">1</span>))),
}))
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">&quot;(a)&quot;</span>).parse(),
<span class="prelude-val">Ok</span>(Ast::Group(ast::Group {
span: span(<span class="number">0</span>..<span class="number">3</span>),
kind: ast::GroupKind::CaptureIndex(<span class="number">1</span>),
ast: Box::new(lit(<span class="string">&#39;a&#39;</span>, <span class="number">1</span>)),
}))
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">&quot;(())&quot;</span>).parse(),
<span class="prelude-val">Ok</span>(Ast::Group(ast::Group {
span: span(<span class="number">0</span>..<span class="number">4</span>),
kind: ast::GroupKind::CaptureIndex(<span class="number">1</span>),
ast: Box::new(Ast::Group(ast::Group {
span: span(<span class="number">1</span>..<span class="number">3</span>),
kind: ast::GroupKind::CaptureIndex(<span class="number">2</span>),
ast: Box::new(Ast::Empty(span(<span class="number">2</span>..<span class="number">2</span>))),
})),
}))
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">&quot;(?:a)&quot;</span>).parse(),
<span class="prelude-val">Ok</span>(Ast::Group(ast::Group {
span: span(<span class="number">0</span>..<span class="number">5</span>),
kind: ast::GroupKind::NonCapturing(ast::Flags {
span: span(<span class="number">2</span>..<span class="number">2</span>),
items: <span class="macro">vec!</span>[],
}),
ast: Box::new(lit(<span class="string">&#39;a&#39;</span>, <span class="number">3</span>)),
}))
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">&quot;(?i:a)&quot;</span>).parse(),
<span class="prelude-val">Ok</span>(Ast::Group(ast::Group {
span: span(<span class="number">0</span>..<span class="number">6</span>),
kind: ast::GroupKind::NonCapturing(ast::Flags {
span: span(<span class="number">2</span>..<span class="number">3</span>),
items: <span class="macro">vec!</span>[ast::FlagsItem {
span: span(<span class="number">2</span>..<span class="number">3</span>),
kind: ast::FlagsItemKind::Flag(
ast::Flag::CaseInsensitive
),
},],
}),
ast: Box::new(lit(<span class="string">&#39;a&#39;</span>, <span class="number">4</span>)),
}))
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">&quot;(?i-U:a)&quot;</span>).parse(),
<span class="prelude-val">Ok</span>(Ast::Group(ast::Group {
span: span(<span class="number">0</span>..<span class="number">8</span>),
kind: ast::GroupKind::NonCapturing(ast::Flags {
span: span(<span class="number">2</span>..<span class="number">5</span>),
items: <span class="macro">vec!</span>[
ast::FlagsItem {
span: span(<span class="number">2</span>..<span class="number">3</span>),
kind: ast::FlagsItemKind::Flag(
ast::Flag::CaseInsensitive
),
},
ast::FlagsItem {
span: span(<span class="number">3</span>..<span class="number">4</span>),
kind: ast::FlagsItemKind::Negation,
},
ast::FlagsItem {
span: span(<span class="number">4</span>..<span class="number">5</span>),
kind: ast::FlagsItemKind::Flag(
ast::Flag::SwapGreed
),
},
],
}),
ast: Box::new(lit(<span class="string">&#39;a&#39;</span>, <span class="number">6</span>)),
}))
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">&quot;(&quot;</span>).parse().unwrap_err(),
TestError {
span: span(<span class="number">0</span>..<span class="number">1</span>),
kind: ast::ErrorKind::GroupUnclosed,
}
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">&quot;(?&quot;</span>).parse().unwrap_err(),
TestError {
span: span(<span class="number">0</span>..<span class="number">1</span>),
kind: ast::ErrorKind::GroupUnclosed,
}
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">&quot;(?P&quot;</span>).parse().unwrap_err(),
TestError {
span: span(<span class="number">2</span>..<span class="number">3</span>),
kind: ast::ErrorKind::FlagUnrecognized,
}
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">&quot;(?P&lt;&quot;</span>).parse().unwrap_err(),
TestError {
span: span(<span class="number">4</span>..<span class="number">4</span>),
kind: ast::ErrorKind::GroupNameUnexpectedEof,
}
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">&quot;(a&quot;</span>).parse().unwrap_err(),
TestError {
span: span(<span class="number">0</span>..<span class="number">1</span>),
kind: ast::ErrorKind::GroupUnclosed,
}
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">&quot;(()&quot;</span>).parse().unwrap_err(),
TestError {
span: span(<span class="number">0</span>..<span class="number">1</span>),
kind: ast::ErrorKind::GroupUnclosed,
}
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">&quot;)&quot;</span>).parse().unwrap_err(),
TestError {
span: span(<span class="number">0</span>..<span class="number">1</span>),
kind: ast::ErrorKind::GroupUnopened,
}
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">&quot;a)&quot;</span>).parse().unwrap_err(),
TestError {
span: span(<span class="number">1</span>..<span class="number">2</span>),
kind: ast::ErrorKind::GroupUnopened,
}
);
}
<span class="attribute">#[test]
</span><span class="kw">fn </span>parse_capture_name() {
<span class="macro">assert_eq!</span>(
parser(<span class="string">&quot;(?&lt;a&gt;z)&quot;</span>).parse(),
<span class="prelude-val">Ok</span>(Ast::Group(ast::Group {
span: span(<span class="number">0</span>..<span class="number">7</span>),
kind: ast::GroupKind::CaptureName {
starts_with_p: <span class="bool-val">false</span>,
name: ast::CaptureName {
span: span(<span class="number">3</span>..<span class="number">4</span>),
name: s(<span class="string">&quot;a&quot;</span>),
index: <span class="number">1</span>,
}
},
ast: Box::new(lit(<span class="string">&#39;z&#39;</span>, <span class="number">5</span>)),
}))
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">&quot;(?P&lt;a&gt;z)&quot;</span>).parse(),
<span class="prelude-val">Ok</span>(Ast::Group(ast::Group {
span: span(<span class="number">0</span>..<span class="number">8</span>),
kind: ast::GroupKind::CaptureName {
starts_with_p: <span class="bool-val">true</span>,
name: ast::CaptureName {
span: span(<span class="number">4</span>..<span class="number">5</span>),
name: s(<span class="string">&quot;a&quot;</span>),
index: <span class="number">1</span>,
}
},
ast: Box::new(lit(<span class="string">&#39;z&#39;</span>, <span class="number">6</span>)),
}))
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">&quot;(?P&lt;abc&gt;z)&quot;</span>).parse(),
<span class="prelude-val">Ok</span>(Ast::Group(ast::Group {
span: span(<span class="number">0</span>..<span class="number">10</span>),
kind: ast::GroupKind::CaptureName {
starts_with_p: <span class="bool-val">true</span>,
name: ast::CaptureName {
span: span(<span class="number">4</span>..<span class="number">7</span>),
name: s(<span class="string">&quot;abc&quot;</span>),
index: <span class="number">1</span>,
}
},
ast: Box::new(lit(<span class="string">&#39;z&#39;</span>, <span class="number">8</span>)),
}))
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">&quot;(?P&lt;a_1&gt;z)&quot;</span>).parse(),
<span class="prelude-val">Ok</span>(Ast::Group(ast::Group {
span: span(<span class="number">0</span>..<span class="number">10</span>),
kind: ast::GroupKind::CaptureName {
starts_with_p: <span class="bool-val">true</span>,
name: ast::CaptureName {
span: span(<span class="number">4</span>..<span class="number">7</span>),
name: s(<span class="string">&quot;a_1&quot;</span>),
index: <span class="number">1</span>,
}
},
ast: Box::new(lit(<span class="string">&#39;z&#39;</span>, <span class="number">8</span>)),
}))
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">&quot;(?P&lt;a.1&gt;z)&quot;</span>).parse(),
<span class="prelude-val">Ok</span>(Ast::Group(ast::Group {
span: span(<span class="number">0</span>..<span class="number">10</span>),
kind: ast::GroupKind::CaptureName {
starts_with_p: <span class="bool-val">true</span>,
name: ast::CaptureName {
span: span(<span class="number">4</span>..<span class="number">7</span>),
name: s(<span class="string">&quot;a.1&quot;</span>),
index: <span class="number">1</span>,
}
},
ast: Box::new(lit(<span class="string">&#39;z&#39;</span>, <span class="number">8</span>)),
}))
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">&quot;(?P&lt;a[1]&gt;z)&quot;</span>).parse(),
<span class="prelude-val">Ok</span>(Ast::Group(ast::Group {
span: span(<span class="number">0</span>..<span class="number">11</span>),
kind: ast::GroupKind::CaptureName {
starts_with_p: <span class="bool-val">true</span>,
name: ast::CaptureName {
span: span(<span class="number">4</span>..<span class="number">8</span>),
name: s(<span class="string">&quot;a[1]&quot;</span>),
index: <span class="number">1</span>,
}
},
ast: Box::new(lit(<span class="string">&#39;z&#39;</span>, <span class="number">9</span>)),
}))
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">&quot;(?P&lt;a¾&gt;)&quot;</span>).parse(),
<span class="prelude-val">Ok</span>(Ast::Group(ast::Group {
span: Span::new(
Position::new(<span class="number">0</span>, <span class="number">1</span>, <span class="number">1</span>),
Position::new(<span class="number">9</span>, <span class="number">1</span>, <span class="number">9</span>),
),
kind: ast::GroupKind::CaptureName {
starts_with_p: <span class="bool-val">true</span>,
name: ast::CaptureName {
span: Span::new(
Position::new(<span class="number">4</span>, <span class="number">1</span>, <span class="number">5</span>),
Position::new(<span class="number">7</span>, <span class="number">1</span>, <span class="number">7</span>),
),
name: s(<span class="string">&quot;a¾&quot;</span>),
index: <span class="number">1</span>,
}
},
ast: Box::new(Ast::Empty(Span::new(
Position::new(<span class="number">8</span>, <span class="number">1</span>, <span class="number">8</span>),
Position::new(<span class="number">8</span>, <span class="number">1</span>, <span class="number">8</span>),
))),
}))
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">&quot;(?P&lt;名字&gt;)&quot;</span>).parse(),
<span class="prelude-val">Ok</span>(Ast::Group(ast::Group {
span: Span::new(
Position::new(<span class="number">0</span>, <span class="number">1</span>, <span class="number">1</span>),
Position::new(<span class="number">12</span>, <span class="number">1</span>, <span class="number">9</span>),
),
kind: ast::GroupKind::CaptureName {
starts_with_p: <span class="bool-val">true</span>,
name: ast::CaptureName {
span: Span::new(
Position::new(<span class="number">4</span>, <span class="number">1</span>, <span class="number">5</span>),
Position::new(<span class="number">10</span>, <span class="number">1</span>, <span class="number">7</span>),
),
name: s(<span class="string">&quot;名字&quot;</span>),
index: <span class="number">1</span>,
}
},
ast: Box::new(Ast::Empty(Span::new(
Position::new(<span class="number">11</span>, <span class="number">1</span>, <span class="number">8</span>),
Position::new(<span class="number">11</span>, <span class="number">1</span>, <span class="number">8</span>),
))),
}))
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">&quot;(?P&lt;&quot;</span>).parse().unwrap_err(),
TestError {
span: span(<span class="number">4</span>..<span class="number">4</span>),
kind: ast::ErrorKind::GroupNameUnexpectedEof,
}
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">&quot;(?P&lt;&gt;z)&quot;</span>).parse().unwrap_err(),
TestError {
span: span(<span class="number">4</span>..<span class="number">4</span>),
kind: ast::ErrorKind::GroupNameEmpty,
}
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">&quot;(?P&lt;a&quot;</span>).parse().unwrap_err(),
TestError {
span: span(<span class="number">5</span>..<span class="number">5</span>),
kind: ast::ErrorKind::GroupNameUnexpectedEof,
}
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">&quot;(?P&lt;ab&quot;</span>).parse().unwrap_err(),
TestError {
span: span(<span class="number">6</span>..<span class="number">6</span>),
kind: ast::ErrorKind::GroupNameUnexpectedEof,
}
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">&quot;(?P&lt;0a&quot;</span>).parse().unwrap_err(),
TestError {
span: span(<span class="number">4</span>..<span class="number">5</span>),
kind: ast::ErrorKind::GroupNameInvalid,
}
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">&quot;(?P&lt;~&quot;</span>).parse().unwrap_err(),
TestError {
span: span(<span class="number">4</span>..<span class="number">5</span>),
kind: ast::ErrorKind::GroupNameInvalid,
}
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">&quot;(?P&lt;abc~&quot;</span>).parse().unwrap_err(),
TestError {
span: span(<span class="number">7</span>..<span class="number">8</span>),
kind: ast::ErrorKind::GroupNameInvalid,
}
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">&quot;(?P&lt;a&gt;y)(?P&lt;a&gt;z)&quot;</span>).parse().unwrap_err(),
TestError {
span: span(<span class="number">12</span>..<span class="number">13</span>),
kind: ast::ErrorKind::GroupNameDuplicate {
original: span(<span class="number">4</span>..<span class="number">5</span>),
},
}
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">&quot;(?P&lt;5&gt;)&quot;</span>).parse().unwrap_err(),
TestError {
span: span(<span class="number">4</span>..<span class="number">5</span>),
kind: ast::ErrorKind::GroupNameInvalid,
}
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">&quot;(?P&lt;5a&gt;)&quot;</span>).parse().unwrap_err(),
TestError {
span: span(<span class="number">4</span>..<span class="number">5</span>),
kind: ast::ErrorKind::GroupNameInvalid,
}
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">&quot;(?P&lt;¾&gt;)&quot;</span>).parse().unwrap_err(),
TestError {
span: Span::new(
Position::new(<span class="number">4</span>, <span class="number">1</span>, <span class="number">5</span>),
Position::new(<span class="number">6</span>, <span class="number">1</span>, <span class="number">6</span>),
),
kind: ast::ErrorKind::GroupNameInvalid,
}
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">&quot;(?P&lt;¾a&gt;)&quot;</span>).parse().unwrap_err(),
TestError {
span: Span::new(
Position::new(<span class="number">4</span>, <span class="number">1</span>, <span class="number">5</span>),
Position::new(<span class="number">6</span>, <span class="number">1</span>, <span class="number">6</span>),
),
kind: ast::ErrorKind::GroupNameInvalid,
}
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">&quot;(?P&lt;☃&gt;)&quot;</span>).parse().unwrap_err(),
TestError {
span: Span::new(
Position::new(<span class="number">4</span>, <span class="number">1</span>, <span class="number">5</span>),
Position::new(<span class="number">7</span>, <span class="number">1</span>, <span class="number">6</span>),
),
kind: ast::ErrorKind::GroupNameInvalid,
}
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">&quot;(?P&lt;a☃&gt;)&quot;</span>).parse().unwrap_err(),
TestError {
span: Span::new(
Position::new(<span class="number">5</span>, <span class="number">1</span>, <span class="number">6</span>),
Position::new(<span class="number">8</span>, <span class="number">1</span>, <span class="number">7</span>),
),
kind: ast::ErrorKind::GroupNameInvalid,
}
);
}
<span class="attribute">#[test]
</span><span class="kw">fn </span>parse_flags() {
<span class="macro">assert_eq!</span>(
parser(<span class="string">&quot;i:&quot;</span>).parse_flags(),
<span class="prelude-val">Ok</span>(ast::Flags {
span: span(<span class="number">0</span>..<span class="number">1</span>),
items: <span class="macro">vec!</span>[ast::FlagsItem {
span: span(<span class="number">0</span>..<span class="number">1</span>),
kind: ast::FlagsItemKind::Flag(ast::Flag::CaseInsensitive),
}],
})
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">&quot;i)&quot;</span>).parse_flags(),
<span class="prelude-val">Ok</span>(ast::Flags {
span: span(<span class="number">0</span>..<span class="number">1</span>),
items: <span class="macro">vec!</span>[ast::FlagsItem {
span: span(<span class="number">0</span>..<span class="number">1</span>),
kind: ast::FlagsItemKind::Flag(ast::Flag::CaseInsensitive),
}],
})
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">&quot;isU:&quot;</span>).parse_flags(),
<span class="prelude-val">Ok</span>(ast::Flags {
span: span(<span class="number">0</span>..<span class="number">3</span>),
items: <span class="macro">vec!</span>[
ast::FlagsItem {
span: span(<span class="number">0</span>..<span class="number">1</span>),
kind: ast::FlagsItemKind::Flag(
ast::Flag::CaseInsensitive
),
},
ast::FlagsItem {
span: span(<span class="number">1</span>..<span class="number">2</span>),
kind: ast::FlagsItemKind::Flag(
ast::Flag::DotMatchesNewLine
),
},
ast::FlagsItem {
span: span(<span class="number">2</span>..<span class="number">3</span>),
kind: ast::FlagsItemKind::Flag(ast::Flag::SwapGreed),
},
],
})
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">&quot;-isU:&quot;</span>).parse_flags(),
<span class="prelude-val">Ok</span>(ast::Flags {
span: span(<span class="number">0</span>..<span class="number">4</span>),
items: <span class="macro">vec!</span>[
ast::FlagsItem {
span: span(<span class="number">0</span>..<span class="number">1</span>),
kind: ast::FlagsItemKind::Negation,
},
ast::FlagsItem {
span: span(<span class="number">1</span>..<span class="number">2</span>),
kind: ast::FlagsItemKind::Flag(
ast::Flag::CaseInsensitive
),
},
ast::FlagsItem {
span: span(<span class="number">2</span>..<span class="number">3</span>),
kind: ast::FlagsItemKind::Flag(
ast::Flag::DotMatchesNewLine
),
},
ast::FlagsItem {
span: span(<span class="number">3</span>..<span class="number">4</span>),
kind: ast::FlagsItemKind::Flag(ast::Flag::SwapGreed),
},
],
})
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">&quot;i-sU:&quot;</span>).parse_flags(),
<span class="prelude-val">Ok</span>(ast::Flags {
span: span(<span class="number">0</span>..<span class="number">4</span>),
items: <span class="macro">vec!</span>[
ast::FlagsItem {
span: span(<span class="number">0</span>..<span class="number">1</span>),
kind: ast::FlagsItemKind::Flag(
ast::Flag::CaseInsensitive
),
},
ast::FlagsItem {
span: span(<span class="number">1</span>..<span class="number">2</span>),
kind: ast::FlagsItemKind::Negation,
},
ast::FlagsItem {
span: span(<span class="number">2</span>..<span class="number">3</span>),
kind: ast::FlagsItemKind::Flag(
ast::Flag::DotMatchesNewLine
),
},
ast::FlagsItem {
span: span(<span class="number">3</span>..<span class="number">4</span>),
kind: ast::FlagsItemKind::Flag(ast::Flag::SwapGreed),
},
],
})
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">&quot;i-sR:&quot;</span>).parse_flags(),
<span class="prelude-val">Ok</span>(ast::Flags {
span: span(<span class="number">0</span>..<span class="number">4</span>),
items: <span class="macro">vec!</span>[
ast::FlagsItem {
span: span(<span class="number">0</span>..<span class="number">1</span>),
kind: ast::FlagsItemKind::Flag(
ast::Flag::CaseInsensitive
),
},
ast::FlagsItem {
span: span(<span class="number">1</span>..<span class="number">2</span>),
kind: ast::FlagsItemKind::Negation,
},
ast::FlagsItem {
span: span(<span class="number">2</span>..<span class="number">3</span>),
kind: ast::FlagsItemKind::Flag(
ast::Flag::DotMatchesNewLine
),
},
ast::FlagsItem {
span: span(<span class="number">3</span>..<span class="number">4</span>),
kind: ast::FlagsItemKind::Flag(ast::Flag::CRLF),
},
],
})
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">&quot;isU&quot;</span>).parse_flags().unwrap_err(),
TestError {
span: span(<span class="number">3</span>..<span class="number">3</span>),
kind: ast::ErrorKind::FlagUnexpectedEof,
}
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">&quot;isUa:&quot;</span>).parse_flags().unwrap_err(),
TestError {
span: span(<span class="number">3</span>..<span class="number">4</span>),
kind: ast::ErrorKind::FlagUnrecognized,
}
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">&quot;isUi:&quot;</span>).parse_flags().unwrap_err(),
TestError {
span: span(<span class="number">3</span>..<span class="number">4</span>),
kind: ast::ErrorKind::FlagDuplicate { original: span(<span class="number">0</span>..<span class="number">1</span>) },
}
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">&quot;i-sU-i:&quot;</span>).parse_flags().unwrap_err(),
TestError {
span: span(<span class="number">4</span>..<span class="number">5</span>),
kind: ast::ErrorKind::FlagRepeatedNegation {
original: span(<span class="number">1</span>..<span class="number">2</span>),
},
}
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">&quot;-)&quot;</span>).parse_flags().unwrap_err(),
TestError {
span: span(<span class="number">0</span>..<span class="number">1</span>),
kind: ast::ErrorKind::FlagDanglingNegation,
}
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">&quot;i-)&quot;</span>).parse_flags().unwrap_err(),
TestError {
span: span(<span class="number">1</span>..<span class="number">2</span>),
kind: ast::ErrorKind::FlagDanglingNegation,
}
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">&quot;iU-)&quot;</span>).parse_flags().unwrap_err(),
TestError {
span: span(<span class="number">2</span>..<span class="number">3</span>),
kind: ast::ErrorKind::FlagDanglingNegation,
}
);
}
<span class="attribute">#[test]
</span><span class="kw">fn </span>parse_flag() {
<span class="macro">assert_eq!</span>(parser(<span class="string">&quot;i&quot;</span>).parse_flag(), <span class="prelude-val">Ok</span>(ast::Flag::CaseInsensitive));
<span class="macro">assert_eq!</span>(parser(<span class="string">&quot;m&quot;</span>).parse_flag(), <span class="prelude-val">Ok</span>(ast::Flag::MultiLine));
<span class="macro">assert_eq!</span>(parser(<span class="string">&quot;s&quot;</span>).parse_flag(), <span class="prelude-val">Ok</span>(ast::Flag::DotMatchesNewLine));
<span class="macro">assert_eq!</span>(parser(<span class="string">&quot;U&quot;</span>).parse_flag(), <span class="prelude-val">Ok</span>(ast::Flag::SwapGreed));
<span class="macro">assert_eq!</span>(parser(<span class="string">&quot;u&quot;</span>).parse_flag(), <span class="prelude-val">Ok</span>(ast::Flag::Unicode));
<span class="macro">assert_eq!</span>(parser(<span class="string">&quot;R&quot;</span>).parse_flag(), <span class="prelude-val">Ok</span>(ast::Flag::CRLF));
<span class="macro">assert_eq!</span>(parser(<span class="string">&quot;x&quot;</span>).parse_flag(), <span class="prelude-val">Ok</span>(ast::Flag::IgnoreWhitespace));
<span class="macro">assert_eq!</span>(
parser(<span class="string">&quot;a&quot;</span>).parse_flag().unwrap_err(),
TestError {
span: span(<span class="number">0</span>..<span class="number">1</span>),
kind: ast::ErrorKind::FlagUnrecognized,
}
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">&quot;☃&quot;</span>).parse_flag().unwrap_err(),
TestError {
span: span_range(<span class="string">&quot;☃&quot;</span>, <span class="number">0</span>..<span class="number">3</span>),
kind: ast::ErrorKind::FlagUnrecognized,
}
);
}
<span class="attribute">#[test]
</span><span class="kw">fn </span>parse_primitive_non_escape() {
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;.&quot;</span>).parse_primitive(),
<span class="prelude-val">Ok</span>(Primitive::Dot(span(<span class="number">0</span>..<span class="number">1</span>)))
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;^&quot;</span>).parse_primitive(),
<span class="prelude-val">Ok</span>(Primitive::Assertion(ast::Assertion {
span: span(<span class="number">0</span>..<span class="number">1</span>),
kind: ast::AssertionKind::StartLine,
}))
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;$&quot;</span>).parse_primitive(),
<span class="prelude-val">Ok</span>(Primitive::Assertion(ast::Assertion {
span: span(<span class="number">0</span>..<span class="number">1</span>),
kind: ast::AssertionKind::EndLine,
}))
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;a&quot;</span>).parse_primitive(),
<span class="prelude-val">Ok</span>(Primitive::Literal(ast::Literal {
span: span(<span class="number">0</span>..<span class="number">1</span>),
kind: ast::LiteralKind::Verbatim,
c: <span class="string">&#39;a&#39;</span>,
}))
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;|&quot;</span>).parse_primitive(),
<span class="prelude-val">Ok</span>(Primitive::Literal(ast::Literal {
span: span(<span class="number">0</span>..<span class="number">1</span>),
kind: ast::LiteralKind::Verbatim,
c: <span class="string">&#39;|&#39;</span>,
}))
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;☃&quot;</span>).parse_primitive(),
<span class="prelude-val">Ok</span>(Primitive::Literal(ast::Literal {
span: span_range(<span class="string">&quot;☃&quot;</span>, <span class="number">0</span>..<span class="number">3</span>),
kind: ast::LiteralKind::Verbatim,
c: <span class="string">&#39;☃&#39;</span>,
}))
);
}
<span class="attribute">#[test]
</span><span class="kw">fn </span>parse_escape() {
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;\|&quot;</span>).parse_primitive(),
<span class="prelude-val">Ok</span>(Primitive::Literal(ast::Literal {
span: span(<span class="number">0</span>..<span class="number">2</span>),
kind: ast::LiteralKind::Meta,
c: <span class="string">&#39;|&#39;</span>,
}))
);
<span class="kw">let </span>specials = <span class="kw-2">&amp;</span>[
(<span class="string">r&quot;\a&quot;</span>, <span class="string">&#39;\x07&#39;</span>, ast::SpecialLiteralKind::Bell),
(<span class="string">r&quot;\f&quot;</span>, <span class="string">&#39;\x0C&#39;</span>, ast::SpecialLiteralKind::FormFeed),
(<span class="string">r&quot;\t&quot;</span>, <span class="string">&#39;\t&#39;</span>, ast::SpecialLiteralKind::Tab),
(<span class="string">r&quot;\n&quot;</span>, <span class="string">&#39;\n&#39;</span>, ast::SpecialLiteralKind::LineFeed),
(<span class="string">r&quot;\r&quot;</span>, <span class="string">&#39;\r&#39;</span>, ast::SpecialLiteralKind::CarriageReturn),
(<span class="string">r&quot;\v&quot;</span>, <span class="string">&#39;\x0B&#39;</span>, ast::SpecialLiteralKind::VerticalTab),
];
<span class="kw">for </span><span class="kw-2">&amp;</span>(pat, c, <span class="kw-2">ref </span>kind) <span class="kw">in </span>specials {
<span class="macro">assert_eq!</span>(
parser(pat).parse_primitive(),
<span class="prelude-val">Ok</span>(Primitive::Literal(ast::Literal {
span: span(<span class="number">0</span>..<span class="number">2</span>),
kind: ast::LiteralKind::Special(kind.clone()),
c,
}))
);
}
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;\A&quot;</span>).parse_primitive(),
<span class="prelude-val">Ok</span>(Primitive::Assertion(ast::Assertion {
span: span(<span class="number">0</span>..<span class="number">2</span>),
kind: ast::AssertionKind::StartText,
}))
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;\z&quot;</span>).parse_primitive(),
<span class="prelude-val">Ok</span>(Primitive::Assertion(ast::Assertion {
span: span(<span class="number">0</span>..<span class="number">2</span>),
kind: ast::AssertionKind::EndText,
}))
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;\b&quot;</span>).parse_primitive(),
<span class="prelude-val">Ok</span>(Primitive::Assertion(ast::Assertion {
span: span(<span class="number">0</span>..<span class="number">2</span>),
kind: ast::AssertionKind::WordBoundary,
}))
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;\B&quot;</span>).parse_primitive(),
<span class="prelude-val">Ok</span>(Primitive::Assertion(ast::Assertion {
span: span(<span class="number">0</span>..<span class="number">2</span>),
kind: ast::AssertionKind::NotWordBoundary,
}))
);
<span class="comment">// We also support superfluous escapes in most cases now too.
</span><span class="kw">for </span>c <span class="kw">in </span>[<span class="string">&#39;!&#39;</span>, <span class="string">&#39;@&#39;</span>, <span class="string">&#39;%&#39;</span>, <span class="string">&#39;&quot;&#39;</span>, <span class="string">&#39;\&#39;&#39;</span>, <span class="string">&#39;/&#39;</span>, <span class="string">&#39; &#39;</span>] {
<span class="kw">let </span>pat = <span class="macro">format!</span>(<span class="string">r&quot;\{}&quot;</span>, c);
<span class="macro">assert_eq!</span>(
parser(<span class="kw-2">&amp;</span>pat).parse_primitive(),
<span class="prelude-val">Ok</span>(Primitive::Literal(ast::Literal {
span: span(<span class="number">0</span>..<span class="number">2</span>),
kind: ast::LiteralKind::Superfluous,
c,
}))
);
}
<span class="comment">// Some superfluous escapes, namely [0-9A-Za-z], are still banned. This
// gives flexibility for future evolution.
</span><span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;\e&quot;</span>).parse_escape().unwrap_err(),
TestError {
span: span(<span class="number">0</span>..<span class="number">2</span>),
kind: ast::ErrorKind::EscapeUnrecognized,
}
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;\y&quot;</span>).parse_escape().unwrap_err(),
TestError {
span: span(<span class="number">0</span>..<span class="number">2</span>),
kind: ast::ErrorKind::EscapeUnrecognized,
}
);
<span class="comment">// But also, &lt; and &gt; are banned, so that we may evolve them into
// start/end word boundary assertions. (Not sure if we will...)
</span><span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;\&lt;&quot;</span>).parse_escape().unwrap_err(),
TestError {
span: span(<span class="number">0</span>..<span class="number">2</span>),
kind: ast::ErrorKind::EscapeUnrecognized,
}
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;\&gt;&quot;</span>).parse_escape().unwrap_err(),
TestError {
span: span(<span class="number">0</span>..<span class="number">2</span>),
kind: ast::ErrorKind::EscapeUnrecognized,
}
);
<span class="comment">// An unfinished escape is illegal.
</span><span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;\&quot;</span>).parse_escape().unwrap_err(),
TestError {
span: span(<span class="number">0</span>..<span class="number">1</span>),
kind: ast::ErrorKind::EscapeUnexpectedEof,
}
);
}
<span class="attribute">#[test]
</span><span class="kw">fn </span>parse_unsupported_backreference() {
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;\0&quot;</span>).parse_escape().unwrap_err(),
TestError {
span: span(<span class="number">0</span>..<span class="number">2</span>),
kind: ast::ErrorKind::UnsupportedBackreference,
}
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;\9&quot;</span>).parse_escape().unwrap_err(),
TestError {
span: span(<span class="number">0</span>..<span class="number">2</span>),
kind: ast::ErrorKind::UnsupportedBackreference,
}
);
}
<span class="attribute">#[test]
</span><span class="kw">fn </span>parse_octal() {
<span class="kw">for </span>i <span class="kw">in </span><span class="number">0</span>..<span class="number">511 </span>{
<span class="kw">let </span>pat = <span class="macro">format!</span>(<span class="string">r&quot;\{:o}&quot;</span>, i);
<span class="macro">assert_eq!</span>(
parser_octal(<span class="kw-2">&amp;</span>pat).parse_escape(),
<span class="prelude-val">Ok</span>(Primitive::Literal(ast::Literal {
span: span(<span class="number">0</span>..pat.len()),
kind: ast::LiteralKind::Octal,
c: char::from_u32(i).unwrap(),
}))
);
}
<span class="macro">assert_eq!</span>(
parser_octal(<span class="string">r&quot;\778&quot;</span>).parse_escape(),
<span class="prelude-val">Ok</span>(Primitive::Literal(ast::Literal {
span: span(<span class="number">0</span>..<span class="number">3</span>),
kind: ast::LiteralKind::Octal,
c: <span class="string">&#39;?&#39;</span>,
}))
);
<span class="macro">assert_eq!</span>(
parser_octal(<span class="string">r&quot;\7777&quot;</span>).parse_escape(),
<span class="prelude-val">Ok</span>(Primitive::Literal(ast::Literal {
span: span(<span class="number">0</span>..<span class="number">4</span>),
kind: ast::LiteralKind::Octal,
c: <span class="string">&#39;\u{01FF}&#39;</span>,
}))
);
<span class="macro">assert_eq!</span>(
parser_octal(<span class="string">r&quot;\778&quot;</span>).parse(),
<span class="prelude-val">Ok</span>(Ast::Concat(ast::Concat {
span: span(<span class="number">0</span>..<span class="number">4</span>),
asts: <span class="macro">vec!</span>[
Ast::Literal(ast::Literal {
span: span(<span class="number">0</span>..<span class="number">3</span>),
kind: ast::LiteralKind::Octal,
c: <span class="string">&#39;?&#39;</span>,
}),
Ast::Literal(ast::Literal {
span: span(<span class="number">3</span>..<span class="number">4</span>),
kind: ast::LiteralKind::Verbatim,
c: <span class="string">&#39;8&#39;</span>,
}),
],
}))
);
<span class="macro">assert_eq!</span>(
parser_octal(<span class="string">r&quot;\7777&quot;</span>).parse(),
<span class="prelude-val">Ok</span>(Ast::Concat(ast::Concat {
span: span(<span class="number">0</span>..<span class="number">5</span>),
asts: <span class="macro">vec!</span>[
Ast::Literal(ast::Literal {
span: span(<span class="number">0</span>..<span class="number">4</span>),
kind: ast::LiteralKind::Octal,
c: <span class="string">&#39;\u{01FF}&#39;</span>,
}),
Ast::Literal(ast::Literal {
span: span(<span class="number">4</span>..<span class="number">5</span>),
kind: ast::LiteralKind::Verbatim,
c: <span class="string">&#39;7&#39;</span>,
}),
],
}))
);
<span class="macro">assert_eq!</span>(
parser_octal(<span class="string">r&quot;\8&quot;</span>).parse_escape().unwrap_err(),
TestError {
span: span(<span class="number">0</span>..<span class="number">2</span>),
kind: ast::ErrorKind::EscapeUnrecognized,
}
);
}
<span class="attribute">#[test]
</span><span class="kw">fn </span>parse_hex_two() {
<span class="kw">for </span>i <span class="kw">in </span><span class="number">0</span>..<span class="number">256 </span>{
<span class="kw">let </span>pat = <span class="macro">format!</span>(<span class="string">r&quot;\x{:02x}&quot;</span>, i);
<span class="macro">assert_eq!</span>(
parser(<span class="kw-2">&amp;</span>pat).parse_escape(),
<span class="prelude-val">Ok</span>(Primitive::Literal(ast::Literal {
span: span(<span class="number">0</span>..pat.len()),
kind: ast::LiteralKind::HexFixed(ast::HexLiteralKind::X),
c: char::from_u32(i).unwrap(),
}))
);
}
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;\xF&quot;</span>).parse_escape().unwrap_err(),
TestError {
span: span(<span class="number">3</span>..<span class="number">3</span>),
kind: ast::ErrorKind::EscapeUnexpectedEof,
}
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;\xG&quot;</span>).parse_escape().unwrap_err(),
TestError {
span: span(<span class="number">2</span>..<span class="number">3</span>),
kind: ast::ErrorKind::EscapeHexInvalidDigit,
}
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;\xFG&quot;</span>).parse_escape().unwrap_err(),
TestError {
span: span(<span class="number">3</span>..<span class="number">4</span>),
kind: ast::ErrorKind::EscapeHexInvalidDigit,
}
);
}
<span class="attribute">#[test]
</span><span class="kw">fn </span>parse_hex_four() {
<span class="kw">for </span>i <span class="kw">in </span><span class="number">0</span>..<span class="number">65536 </span>{
<span class="kw">let </span>c = <span class="kw">match </span>char::from_u32(i) {
<span class="prelude-val">None </span>=&gt; <span class="kw">continue</span>,
<span class="prelude-val">Some</span>(c) =&gt; c,
};
<span class="kw">let </span>pat = <span class="macro">format!</span>(<span class="string">r&quot;\u{:04x}&quot;</span>, i);
<span class="macro">assert_eq!</span>(
parser(<span class="kw-2">&amp;</span>pat).parse_escape(),
<span class="prelude-val">Ok</span>(Primitive::Literal(ast::Literal {
span: span(<span class="number">0</span>..pat.len()),
kind: ast::LiteralKind::HexFixed(
ast::HexLiteralKind::UnicodeShort
),
c,
}))
);
}
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;\uF&quot;</span>).parse_escape().unwrap_err(),
TestError {
span: span(<span class="number">3</span>..<span class="number">3</span>),
kind: ast::ErrorKind::EscapeUnexpectedEof,
}
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;\uG&quot;</span>).parse_escape().unwrap_err(),
TestError {
span: span(<span class="number">2</span>..<span class="number">3</span>),
kind: ast::ErrorKind::EscapeHexInvalidDigit,
}
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;\uFG&quot;</span>).parse_escape().unwrap_err(),
TestError {
span: span(<span class="number">3</span>..<span class="number">4</span>),
kind: ast::ErrorKind::EscapeHexInvalidDigit,
}
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;\uFFG&quot;</span>).parse_escape().unwrap_err(),
TestError {
span: span(<span class="number">4</span>..<span class="number">5</span>),
kind: ast::ErrorKind::EscapeHexInvalidDigit,
}
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;\uFFFG&quot;</span>).parse_escape().unwrap_err(),
TestError {
span: span(<span class="number">5</span>..<span class="number">6</span>),
kind: ast::ErrorKind::EscapeHexInvalidDigit,
}
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;\uD800&quot;</span>).parse_escape().unwrap_err(),
TestError {
span: span(<span class="number">2</span>..<span class="number">6</span>),
kind: ast::ErrorKind::EscapeHexInvalid,
}
);
}
<span class="attribute">#[test]
</span><span class="kw">fn </span>parse_hex_eight() {
<span class="kw">for </span>i <span class="kw">in </span><span class="number">0</span>..<span class="number">65536 </span>{
<span class="kw">let </span>c = <span class="kw">match </span>char::from_u32(i) {
<span class="prelude-val">None </span>=&gt; <span class="kw">continue</span>,
<span class="prelude-val">Some</span>(c) =&gt; c,
};
<span class="kw">let </span>pat = <span class="macro">format!</span>(<span class="string">r&quot;\U{:08x}&quot;</span>, i);
<span class="macro">assert_eq!</span>(
parser(<span class="kw-2">&amp;</span>pat).parse_escape(),
<span class="prelude-val">Ok</span>(Primitive::Literal(ast::Literal {
span: span(<span class="number">0</span>..pat.len()),
kind: ast::LiteralKind::HexFixed(
ast::HexLiteralKind::UnicodeLong
),
c,
}))
);
}
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;\UF&quot;</span>).parse_escape().unwrap_err(),
TestError {
span: span(<span class="number">3</span>..<span class="number">3</span>),
kind: ast::ErrorKind::EscapeUnexpectedEof,
}
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;\UG&quot;</span>).parse_escape().unwrap_err(),
TestError {
span: span(<span class="number">2</span>..<span class="number">3</span>),
kind: ast::ErrorKind::EscapeHexInvalidDigit,
}
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;\UFG&quot;</span>).parse_escape().unwrap_err(),
TestError {
span: span(<span class="number">3</span>..<span class="number">4</span>),
kind: ast::ErrorKind::EscapeHexInvalidDigit,
}
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;\UFFG&quot;</span>).parse_escape().unwrap_err(),
TestError {
span: span(<span class="number">4</span>..<span class="number">5</span>),
kind: ast::ErrorKind::EscapeHexInvalidDigit,
}
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;\UFFFG&quot;</span>).parse_escape().unwrap_err(),
TestError {
span: span(<span class="number">5</span>..<span class="number">6</span>),
kind: ast::ErrorKind::EscapeHexInvalidDigit,
}
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;\UFFFFG&quot;</span>).parse_escape().unwrap_err(),
TestError {
span: span(<span class="number">6</span>..<span class="number">7</span>),
kind: ast::ErrorKind::EscapeHexInvalidDigit,
}
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;\UFFFFFG&quot;</span>).parse_escape().unwrap_err(),
TestError {
span: span(<span class="number">7</span>..<span class="number">8</span>),
kind: ast::ErrorKind::EscapeHexInvalidDigit,
}
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;\UFFFFFFG&quot;</span>).parse_escape().unwrap_err(),
TestError {
span: span(<span class="number">8</span>..<span class="number">9</span>),
kind: ast::ErrorKind::EscapeHexInvalidDigit,
}
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;\UFFFFFFFG&quot;</span>).parse_escape().unwrap_err(),
TestError {
span: span(<span class="number">9</span>..<span class="number">10</span>),
kind: ast::ErrorKind::EscapeHexInvalidDigit,
}
);
}
<span class="attribute">#[test]
</span><span class="kw">fn </span>parse_hex_brace() {
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;\u{26c4}&quot;</span>).parse_escape(),
<span class="prelude-val">Ok</span>(Primitive::Literal(ast::Literal {
span: span(<span class="number">0</span>..<span class="number">8</span>),
kind: ast::LiteralKind::HexBrace(
ast::HexLiteralKind::UnicodeShort
),
c: <span class="string">&#39;⛄&#39;</span>,
}))
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;\U{26c4}&quot;</span>).parse_escape(),
<span class="prelude-val">Ok</span>(Primitive::Literal(ast::Literal {
span: span(<span class="number">0</span>..<span class="number">8</span>),
kind: ast::LiteralKind::HexBrace(
ast::HexLiteralKind::UnicodeLong
),
c: <span class="string">&#39;⛄&#39;</span>,
}))
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;\x{26c4}&quot;</span>).parse_escape(),
<span class="prelude-val">Ok</span>(Primitive::Literal(ast::Literal {
span: span(<span class="number">0</span>..<span class="number">8</span>),
kind: ast::LiteralKind::HexBrace(ast::HexLiteralKind::X),
c: <span class="string">&#39;⛄&#39;</span>,
}))
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;\x{26C4}&quot;</span>).parse_escape(),
<span class="prelude-val">Ok</span>(Primitive::Literal(ast::Literal {
span: span(<span class="number">0</span>..<span class="number">8</span>),
kind: ast::LiteralKind::HexBrace(ast::HexLiteralKind::X),
c: <span class="string">&#39;⛄&#39;</span>,
}))
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;\x{10fFfF}&quot;</span>).parse_escape(),
<span class="prelude-val">Ok</span>(Primitive::Literal(ast::Literal {
span: span(<span class="number">0</span>..<span class="number">10</span>),
kind: ast::LiteralKind::HexBrace(ast::HexLiteralKind::X),
c: <span class="string">&#39;\u{10FFFF}&#39;</span>,
}))
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;\x&quot;</span>).parse_escape().unwrap_err(),
TestError {
span: span(<span class="number">2</span>..<span class="number">2</span>),
kind: ast::ErrorKind::EscapeUnexpectedEof,
}
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;\x{&quot;</span>).parse_escape().unwrap_err(),
TestError {
span: span(<span class="number">2</span>..<span class="number">3</span>),
kind: ast::ErrorKind::EscapeUnexpectedEof,
}
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;\x{FF&quot;</span>).parse_escape().unwrap_err(),
TestError {
span: span(<span class="number">2</span>..<span class="number">5</span>),
kind: ast::ErrorKind::EscapeUnexpectedEof,
}
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;\x{}&quot;</span>).parse_escape().unwrap_err(),
TestError {
span: span(<span class="number">2</span>..<span class="number">4</span>),
kind: ast::ErrorKind::EscapeHexEmpty,
}
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;\x{FGF}&quot;</span>).parse_escape().unwrap_err(),
TestError {
span: span(<span class="number">4</span>..<span class="number">5</span>),
kind: ast::ErrorKind::EscapeHexInvalidDigit,
}
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;\x{FFFFFF}&quot;</span>).parse_escape().unwrap_err(),
TestError {
span: span(<span class="number">3</span>..<span class="number">9</span>),
kind: ast::ErrorKind::EscapeHexInvalid,
}
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;\x{D800}&quot;</span>).parse_escape().unwrap_err(),
TestError {
span: span(<span class="number">3</span>..<span class="number">7</span>),
kind: ast::ErrorKind::EscapeHexInvalid,
}
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;\x{FFFFFFFFF}&quot;</span>).parse_escape().unwrap_err(),
TestError {
span: span(<span class="number">3</span>..<span class="number">12</span>),
kind: ast::ErrorKind::EscapeHexInvalid,
}
);
}
<span class="attribute">#[test]
</span><span class="kw">fn </span>parse_decimal() {
<span class="macro">assert_eq!</span>(parser(<span class="string">&quot;123&quot;</span>).parse_decimal(), <span class="prelude-val">Ok</span>(<span class="number">123</span>));
<span class="macro">assert_eq!</span>(parser(<span class="string">&quot;0&quot;</span>).parse_decimal(), <span class="prelude-val">Ok</span>(<span class="number">0</span>));
<span class="macro">assert_eq!</span>(parser(<span class="string">&quot;01&quot;</span>).parse_decimal(), <span class="prelude-val">Ok</span>(<span class="number">1</span>));
<span class="macro">assert_eq!</span>(
parser(<span class="string">&quot;-1&quot;</span>).parse_decimal().unwrap_err(),
TestError { span: span(<span class="number">0</span>..<span class="number">0</span>), kind: ast::ErrorKind::DecimalEmpty }
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">&quot;&quot;</span>).parse_decimal().unwrap_err(),
TestError { span: span(<span class="number">0</span>..<span class="number">0</span>), kind: ast::ErrorKind::DecimalEmpty }
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">&quot;9999999999&quot;</span>).parse_decimal().unwrap_err(),
TestError {
span: span(<span class="number">0</span>..<span class="number">10</span>),
kind: ast::ErrorKind::DecimalInvalid,
}
);
}
<span class="attribute">#[test]
</span><span class="kw">fn </span>parse_set_class() {
<span class="kw">fn </span>union(span: Span, items: Vec&lt;ast::ClassSetItem&gt;) -&gt; ast::ClassSet {
ast::ClassSet::union(ast::ClassSetUnion { span, items })
}
<span class="kw">fn </span>intersection(
span: Span,
lhs: ast::ClassSet,
rhs: ast::ClassSet,
) -&gt; ast::ClassSet {
ast::ClassSet::BinaryOp(ast::ClassSetBinaryOp {
span,
kind: ast::ClassSetBinaryOpKind::Intersection,
lhs: Box::new(lhs),
rhs: Box::new(rhs),
})
}
<span class="kw">fn </span>difference(
span: Span,
lhs: ast::ClassSet,
rhs: ast::ClassSet,
) -&gt; ast::ClassSet {
ast::ClassSet::BinaryOp(ast::ClassSetBinaryOp {
span,
kind: ast::ClassSetBinaryOpKind::Difference,
lhs: Box::new(lhs),
rhs: Box::new(rhs),
})
}
<span class="kw">fn </span>symdifference(
span: Span,
lhs: ast::ClassSet,
rhs: ast::ClassSet,
) -&gt; ast::ClassSet {
ast::ClassSet::BinaryOp(ast::ClassSetBinaryOp {
span,
kind: ast::ClassSetBinaryOpKind::SymmetricDifference,
lhs: Box::new(lhs),
rhs: Box::new(rhs),
})
}
<span class="kw">fn </span>itemset(item: ast::ClassSetItem) -&gt; ast::ClassSet {
ast::ClassSet::Item(item)
}
<span class="kw">fn </span>item_ascii(cls: ast::ClassAscii) -&gt; ast::ClassSetItem {
ast::ClassSetItem::Ascii(cls)
}
<span class="kw">fn </span>item_unicode(cls: ast::ClassUnicode) -&gt; ast::ClassSetItem {
ast::ClassSetItem::Unicode(cls)
}
<span class="kw">fn </span>item_perl(cls: ast::ClassPerl) -&gt; ast::ClassSetItem {
ast::ClassSetItem::Perl(cls)
}
<span class="kw">fn </span>item_bracket(cls: ast::ClassBracketed) -&gt; ast::ClassSetItem {
ast::ClassSetItem::Bracketed(Box::new(cls))
}
<span class="kw">fn </span>lit(span: Span, c: char) -&gt; ast::ClassSetItem {
ast::ClassSetItem::Literal(ast::Literal {
span,
kind: ast::LiteralKind::Verbatim,
c,
})
}
<span class="kw">fn </span>empty(span: Span) -&gt; ast::ClassSetItem {
ast::ClassSetItem::Empty(span)
}
<span class="kw">fn </span>range(span: Span, start: char, end: char) -&gt; ast::ClassSetItem {
<span class="kw">let </span>pos1 = Position {
offset: span.start.offset + start.len_utf8(),
column: span.start.column + <span class="number">1</span>,
..span.start
};
<span class="kw">let </span>pos2 = Position {
offset: span.end.offset - end.len_utf8(),
column: span.end.column - <span class="number">1</span>,
..span.end
};
ast::ClassSetItem::Range(ast::ClassSetRange {
span,
start: ast::Literal {
span: Span { end: pos1, ..span },
kind: ast::LiteralKind::Verbatim,
c: start,
},
end: ast::Literal {
span: Span { start: pos2, ..span },
kind: ast::LiteralKind::Verbatim,
c: end,
},
})
}
<span class="kw">fn </span>alnum(span: Span, negated: bool) -&gt; ast::ClassAscii {
ast::ClassAscii { span, kind: ast::ClassAsciiKind::Alnum, negated }
}
<span class="kw">fn </span>lower(span: Span, negated: bool) -&gt; ast::ClassAscii {
ast::ClassAscii { span, kind: ast::ClassAsciiKind::Lower, negated }
}
<span class="macro">assert_eq!</span>(
parser(<span class="string">&quot;[[:alnum:]]&quot;</span>).parse(),
<span class="prelude-val">Ok</span>(Ast::Class(ast::Class::Bracketed(ast::ClassBracketed {
span: span(<span class="number">0</span>..<span class="number">11</span>),
negated: <span class="bool-val">false</span>,
kind: itemset(item_ascii(alnum(span(<span class="number">1</span>..<span class="number">10</span>), <span class="bool-val">false</span>))),
})))
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">&quot;[[[:alnum:]]]&quot;</span>).parse(),
<span class="prelude-val">Ok</span>(Ast::Class(ast::Class::Bracketed(ast::ClassBracketed {
span: span(<span class="number">0</span>..<span class="number">13</span>),
negated: <span class="bool-val">false</span>,
kind: itemset(item_bracket(ast::ClassBracketed {
span: span(<span class="number">1</span>..<span class="number">12</span>),
negated: <span class="bool-val">false</span>,
kind: itemset(item_ascii(alnum(span(<span class="number">2</span>..<span class="number">11</span>), <span class="bool-val">false</span>))),
})),
})))
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">&quot;[[:alnum:]&amp;&amp;[:lower:]]&quot;</span>).parse(),
<span class="prelude-val">Ok</span>(Ast::Class(ast::Class::Bracketed(ast::ClassBracketed {
span: span(<span class="number">0</span>..<span class="number">22</span>),
negated: <span class="bool-val">false</span>,
kind: intersection(
span(<span class="number">1</span>..<span class="number">21</span>),
itemset(item_ascii(alnum(span(<span class="number">1</span>..<span class="number">10</span>), <span class="bool-val">false</span>))),
itemset(item_ascii(lower(span(<span class="number">12</span>..<span class="number">21</span>), <span class="bool-val">false</span>))),
),
})))
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">&quot;[[:alnum:]--[:lower:]]&quot;</span>).parse(),
<span class="prelude-val">Ok</span>(Ast::Class(ast::Class::Bracketed(ast::ClassBracketed {
span: span(<span class="number">0</span>..<span class="number">22</span>),
negated: <span class="bool-val">false</span>,
kind: difference(
span(<span class="number">1</span>..<span class="number">21</span>),
itemset(item_ascii(alnum(span(<span class="number">1</span>..<span class="number">10</span>), <span class="bool-val">false</span>))),
itemset(item_ascii(lower(span(<span class="number">12</span>..<span class="number">21</span>), <span class="bool-val">false</span>))),
),
})))
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">&quot;[[:alnum:]~~[:lower:]]&quot;</span>).parse(),
<span class="prelude-val">Ok</span>(Ast::Class(ast::Class::Bracketed(ast::ClassBracketed {
span: span(<span class="number">0</span>..<span class="number">22</span>),
negated: <span class="bool-val">false</span>,
kind: symdifference(
span(<span class="number">1</span>..<span class="number">21</span>),
itemset(item_ascii(alnum(span(<span class="number">1</span>..<span class="number">10</span>), <span class="bool-val">false</span>))),
itemset(item_ascii(lower(span(<span class="number">12</span>..<span class="number">21</span>), <span class="bool-val">false</span>))),
),
})))
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">&quot;[a]&quot;</span>).parse(),
<span class="prelude-val">Ok</span>(Ast::Class(ast::Class::Bracketed(ast::ClassBracketed {
span: span(<span class="number">0</span>..<span class="number">3</span>),
negated: <span class="bool-val">false</span>,
kind: itemset(lit(span(<span class="number">1</span>..<span class="number">2</span>), <span class="string">&#39;a&#39;</span>)),
})))
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;[a\]]&quot;</span>).parse(),
<span class="prelude-val">Ok</span>(Ast::Class(ast::Class::Bracketed(ast::ClassBracketed {
span: span(<span class="number">0</span>..<span class="number">5</span>),
negated: <span class="bool-val">false</span>,
kind: union(
span(<span class="number">1</span>..<span class="number">4</span>),
<span class="macro">vec!</span>[
lit(span(<span class="number">1</span>..<span class="number">2</span>), <span class="string">&#39;a&#39;</span>),
ast::ClassSetItem::Literal(ast::Literal {
span: span(<span class="number">2</span>..<span class="number">4</span>),
kind: ast::LiteralKind::Meta,
c: <span class="string">&#39;]&#39;</span>,
}),
]
),
})))
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;[a\-z]&quot;</span>).parse(),
<span class="prelude-val">Ok</span>(Ast::Class(ast::Class::Bracketed(ast::ClassBracketed {
span: span(<span class="number">0</span>..<span class="number">6</span>),
negated: <span class="bool-val">false</span>,
kind: union(
span(<span class="number">1</span>..<span class="number">5</span>),
<span class="macro">vec!</span>[
lit(span(<span class="number">1</span>..<span class="number">2</span>), <span class="string">&#39;a&#39;</span>),
ast::ClassSetItem::Literal(ast::Literal {
span: span(<span class="number">2</span>..<span class="number">4</span>),
kind: ast::LiteralKind::Meta,
c: <span class="string">&#39;-&#39;</span>,
}),
lit(span(<span class="number">4</span>..<span class="number">5</span>), <span class="string">&#39;z&#39;</span>),
]
),
})))
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">&quot;[ab]&quot;</span>).parse(),
<span class="prelude-val">Ok</span>(Ast::Class(ast::Class::Bracketed(ast::ClassBracketed {
span: span(<span class="number">0</span>..<span class="number">4</span>),
negated: <span class="bool-val">false</span>,
kind: union(
span(<span class="number">1</span>..<span class="number">3</span>),
<span class="macro">vec!</span>[lit(span(<span class="number">1</span>..<span class="number">2</span>), <span class="string">&#39;a&#39;</span>), lit(span(<span class="number">2</span>..<span class="number">3</span>), <span class="string">&#39;b&#39;</span>),]
),
})))
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">&quot;[a-]&quot;</span>).parse(),
<span class="prelude-val">Ok</span>(Ast::Class(ast::Class::Bracketed(ast::ClassBracketed {
span: span(<span class="number">0</span>..<span class="number">4</span>),
negated: <span class="bool-val">false</span>,
kind: union(
span(<span class="number">1</span>..<span class="number">3</span>),
<span class="macro">vec!</span>[lit(span(<span class="number">1</span>..<span class="number">2</span>), <span class="string">&#39;a&#39;</span>), lit(span(<span class="number">2</span>..<span class="number">3</span>), <span class="string">&#39;-&#39;</span>),]
),
})))
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">&quot;[-a]&quot;</span>).parse(),
<span class="prelude-val">Ok</span>(Ast::Class(ast::Class::Bracketed(ast::ClassBracketed {
span: span(<span class="number">0</span>..<span class="number">4</span>),
negated: <span class="bool-val">false</span>,
kind: union(
span(<span class="number">1</span>..<span class="number">3</span>),
<span class="macro">vec!</span>[lit(span(<span class="number">1</span>..<span class="number">2</span>), <span class="string">&#39;-&#39;</span>), lit(span(<span class="number">2</span>..<span class="number">3</span>), <span class="string">&#39;a&#39;</span>),]
),
})))
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;[\pL]&quot;</span>).parse(),
<span class="prelude-val">Ok</span>(Ast::Class(ast::Class::Bracketed(ast::ClassBracketed {
span: span(<span class="number">0</span>..<span class="number">5</span>),
negated: <span class="bool-val">false</span>,
kind: itemset(item_unicode(ast::ClassUnicode {
span: span(<span class="number">1</span>..<span class="number">4</span>),
negated: <span class="bool-val">false</span>,
kind: ast::ClassUnicodeKind::OneLetter(<span class="string">&#39;L&#39;</span>),
})),
})))
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;[\w]&quot;</span>).parse(),
<span class="prelude-val">Ok</span>(Ast::Class(ast::Class::Bracketed(ast::ClassBracketed {
span: span(<span class="number">0</span>..<span class="number">4</span>),
negated: <span class="bool-val">false</span>,
kind: itemset(item_perl(ast::ClassPerl {
span: span(<span class="number">1</span>..<span class="number">3</span>),
kind: ast::ClassPerlKind::Word,
negated: <span class="bool-val">false</span>,
})),
})))
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;[a\wz]&quot;</span>).parse(),
<span class="prelude-val">Ok</span>(Ast::Class(ast::Class::Bracketed(ast::ClassBracketed {
span: span(<span class="number">0</span>..<span class="number">6</span>),
negated: <span class="bool-val">false</span>,
kind: union(
span(<span class="number">1</span>..<span class="number">5</span>),
<span class="macro">vec!</span>[
lit(span(<span class="number">1</span>..<span class="number">2</span>), <span class="string">&#39;a&#39;</span>),
item_perl(ast::ClassPerl {
span: span(<span class="number">2</span>..<span class="number">4</span>),
kind: ast::ClassPerlKind::Word,
negated: <span class="bool-val">false</span>,
}),
lit(span(<span class="number">4</span>..<span class="number">5</span>), <span class="string">&#39;z&#39;</span>),
]
),
})))
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">&quot;[a-z]&quot;</span>).parse(),
<span class="prelude-val">Ok</span>(Ast::Class(ast::Class::Bracketed(ast::ClassBracketed {
span: span(<span class="number">0</span>..<span class="number">5</span>),
negated: <span class="bool-val">false</span>,
kind: itemset(range(span(<span class="number">1</span>..<span class="number">4</span>), <span class="string">&#39;a&#39;</span>, <span class="string">&#39;z&#39;</span>)),
})))
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">&quot;[a-cx-z]&quot;</span>).parse(),
<span class="prelude-val">Ok</span>(Ast::Class(ast::Class::Bracketed(ast::ClassBracketed {
span: span(<span class="number">0</span>..<span class="number">8</span>),
negated: <span class="bool-val">false</span>,
kind: union(
span(<span class="number">1</span>..<span class="number">7</span>),
<span class="macro">vec!</span>[
range(span(<span class="number">1</span>..<span class="number">4</span>), <span class="string">&#39;a&#39;</span>, <span class="string">&#39;c&#39;</span>),
range(span(<span class="number">4</span>..<span class="number">7</span>), <span class="string">&#39;x&#39;</span>, <span class="string">&#39;z&#39;</span>),
]
),
})))
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;[\w&amp;&amp;a-cx-z]&quot;</span>).parse(),
<span class="prelude-val">Ok</span>(Ast::Class(ast::Class::Bracketed(ast::ClassBracketed {
span: span(<span class="number">0</span>..<span class="number">12</span>),
negated: <span class="bool-val">false</span>,
kind: intersection(
span(<span class="number">1</span>..<span class="number">11</span>),
itemset(item_perl(ast::ClassPerl {
span: span(<span class="number">1</span>..<span class="number">3</span>),
kind: ast::ClassPerlKind::Word,
negated: <span class="bool-val">false</span>,
})),
union(
span(<span class="number">5</span>..<span class="number">11</span>),
<span class="macro">vec!</span>[
range(span(<span class="number">5</span>..<span class="number">8</span>), <span class="string">&#39;a&#39;</span>, <span class="string">&#39;c&#39;</span>),
range(span(<span class="number">8</span>..<span class="number">11</span>), <span class="string">&#39;x&#39;</span>, <span class="string">&#39;z&#39;</span>),
]
),
),
})))
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;[a-cx-z&amp;&amp;\w]&quot;</span>).parse(),
<span class="prelude-val">Ok</span>(Ast::Class(ast::Class::Bracketed(ast::ClassBracketed {
span: span(<span class="number">0</span>..<span class="number">12</span>),
negated: <span class="bool-val">false</span>,
kind: intersection(
span(<span class="number">1</span>..<span class="number">11</span>),
union(
span(<span class="number">1</span>..<span class="number">7</span>),
<span class="macro">vec!</span>[
range(span(<span class="number">1</span>..<span class="number">4</span>), <span class="string">&#39;a&#39;</span>, <span class="string">&#39;c&#39;</span>),
range(span(<span class="number">4</span>..<span class="number">7</span>), <span class="string">&#39;x&#39;</span>, <span class="string">&#39;z&#39;</span>),
]
),
itemset(item_perl(ast::ClassPerl {
span: span(<span class="number">9</span>..<span class="number">11</span>),
kind: ast::ClassPerlKind::Word,
negated: <span class="bool-val">false</span>,
})),
),
})))
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;[a--b--c]&quot;</span>).parse(),
<span class="prelude-val">Ok</span>(Ast::Class(ast::Class::Bracketed(ast::ClassBracketed {
span: span(<span class="number">0</span>..<span class="number">9</span>),
negated: <span class="bool-val">false</span>,
kind: difference(
span(<span class="number">1</span>..<span class="number">8</span>),
difference(
span(<span class="number">1</span>..<span class="number">5</span>),
itemset(lit(span(<span class="number">1</span>..<span class="number">2</span>), <span class="string">&#39;a&#39;</span>)),
itemset(lit(span(<span class="number">4</span>..<span class="number">5</span>), <span class="string">&#39;b&#39;</span>)),
),
itemset(lit(span(<span class="number">7</span>..<span class="number">8</span>), <span class="string">&#39;c&#39;</span>)),
),
})))
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;[a~~b~~c]&quot;</span>).parse(),
<span class="prelude-val">Ok</span>(Ast::Class(ast::Class::Bracketed(ast::ClassBracketed {
span: span(<span class="number">0</span>..<span class="number">9</span>),
negated: <span class="bool-val">false</span>,
kind: symdifference(
span(<span class="number">1</span>..<span class="number">8</span>),
symdifference(
span(<span class="number">1</span>..<span class="number">5</span>),
itemset(lit(span(<span class="number">1</span>..<span class="number">2</span>), <span class="string">&#39;a&#39;</span>)),
itemset(lit(span(<span class="number">4</span>..<span class="number">5</span>), <span class="string">&#39;b&#39;</span>)),
),
itemset(lit(span(<span class="number">7</span>..<span class="number">8</span>), <span class="string">&#39;c&#39;</span>)),
),
})))
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;[\^&amp;&amp;^]&quot;</span>).parse(),
<span class="prelude-val">Ok</span>(Ast::Class(ast::Class::Bracketed(ast::ClassBracketed {
span: span(<span class="number">0</span>..<span class="number">7</span>),
negated: <span class="bool-val">false</span>,
kind: intersection(
span(<span class="number">1</span>..<span class="number">6</span>),
itemset(ast::ClassSetItem::Literal(ast::Literal {
span: span(<span class="number">1</span>..<span class="number">3</span>),
kind: ast::LiteralKind::Meta,
c: <span class="string">&#39;^&#39;</span>,
})),
itemset(lit(span(<span class="number">5</span>..<span class="number">6</span>), <span class="string">&#39;^&#39;</span>)),
),
})))
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;[\&amp;&amp;&amp;&amp;]&quot;</span>).parse(),
<span class="prelude-val">Ok</span>(Ast::Class(ast::Class::Bracketed(ast::ClassBracketed {
span: span(<span class="number">0</span>..<span class="number">7</span>),
negated: <span class="bool-val">false</span>,
kind: intersection(
span(<span class="number">1</span>..<span class="number">6</span>),
itemset(ast::ClassSetItem::Literal(ast::Literal {
span: span(<span class="number">1</span>..<span class="number">3</span>),
kind: ast::LiteralKind::Meta,
c: <span class="string">&#39;&amp;&#39;</span>,
})),
itemset(lit(span(<span class="number">5</span>..<span class="number">6</span>), <span class="string">&#39;&amp;&#39;</span>)),
),
})))
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;[&amp;&amp;&amp;&amp;]&quot;</span>).parse(),
<span class="prelude-val">Ok</span>(Ast::Class(ast::Class::Bracketed(ast::ClassBracketed {
span: span(<span class="number">0</span>..<span class="number">6</span>),
negated: <span class="bool-val">false</span>,
kind: intersection(
span(<span class="number">1</span>..<span class="number">5</span>),
intersection(
span(<span class="number">1</span>..<span class="number">3</span>),
itemset(empty(span(<span class="number">1</span>..<span class="number">1</span>))),
itemset(empty(span(<span class="number">3</span>..<span class="number">3</span>))),
),
itemset(empty(span(<span class="number">5</span>..<span class="number">5</span>))),
),
})))
);
<span class="kw">let </span>pat = <span class="string">&quot;[☃-⛄]&quot;</span>;
<span class="macro">assert_eq!</span>(
parser(pat).parse(),
<span class="prelude-val">Ok</span>(Ast::Class(ast::Class::Bracketed(ast::ClassBracketed {
span: span_range(pat, <span class="number">0</span>..<span class="number">9</span>),
negated: <span class="bool-val">false</span>,
kind: itemset(ast::ClassSetItem::Range(ast::ClassSetRange {
span: span_range(pat, <span class="number">1</span>..<span class="number">8</span>),
start: ast::Literal {
span: span_range(pat, <span class="number">1</span>..<span class="number">4</span>),
kind: ast::LiteralKind::Verbatim,
c: <span class="string">&#39;☃&#39;</span>,
},
end: ast::Literal {
span: span_range(pat, <span class="number">5</span>..<span class="number">8</span>),
kind: ast::LiteralKind::Verbatim,
c: <span class="string">&#39;⛄&#39;</span>,
},
})),
})))
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;[]]&quot;</span>).parse(),
<span class="prelude-val">Ok</span>(Ast::Class(ast::Class::Bracketed(ast::ClassBracketed {
span: span(<span class="number">0</span>..<span class="number">3</span>),
negated: <span class="bool-val">false</span>,
kind: itemset(lit(span(<span class="number">1</span>..<span class="number">2</span>), <span class="string">&#39;]&#39;</span>)),
})))
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;[]\[]&quot;</span>).parse(),
<span class="prelude-val">Ok</span>(Ast::Class(ast::Class::Bracketed(ast::ClassBracketed {
span: span(<span class="number">0</span>..<span class="number">5</span>),
negated: <span class="bool-val">false</span>,
kind: union(
span(<span class="number">1</span>..<span class="number">4</span>),
<span class="macro">vec!</span>[
lit(span(<span class="number">1</span>..<span class="number">2</span>), <span class="string">&#39;]&#39;</span>),
ast::ClassSetItem::Literal(ast::Literal {
span: span(<span class="number">2</span>..<span class="number">4</span>),
kind: ast::LiteralKind::Meta,
c: <span class="string">&#39;[&#39;</span>,
}),
]
),
})))
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;[\[]]&quot;</span>).parse(),
<span class="prelude-val">Ok</span>(concat(
<span class="number">0</span>..<span class="number">5</span>,
<span class="macro">vec!</span>[
Ast::Class(ast::Class::Bracketed(ast::ClassBracketed {
span: span(<span class="number">0</span>..<span class="number">4</span>),
negated: <span class="bool-val">false</span>,
kind: itemset(ast::ClassSetItem::Literal(
ast::Literal {
span: span(<span class="number">1</span>..<span class="number">3</span>),
kind: ast::LiteralKind::Meta,
c: <span class="string">&#39;[&#39;</span>,
}
)),
})),
Ast::Literal(ast::Literal {
span: span(<span class="number">4</span>..<span class="number">5</span>),
kind: ast::LiteralKind::Verbatim,
c: <span class="string">&#39;]&#39;</span>,
}),
]
))
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">&quot;[&quot;</span>).parse().unwrap_err(),
TestError {
span: span(<span class="number">0</span>..<span class="number">1</span>),
kind: ast::ErrorKind::ClassUnclosed,
}
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">&quot;[[&quot;</span>).parse().unwrap_err(),
TestError {
span: span(<span class="number">1</span>..<span class="number">2</span>),
kind: ast::ErrorKind::ClassUnclosed,
}
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">&quot;[[-]&quot;</span>).parse().unwrap_err(),
TestError {
span: span(<span class="number">0</span>..<span class="number">1</span>),
kind: ast::ErrorKind::ClassUnclosed,
}
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">&quot;[[[:alnum:]&quot;</span>).parse().unwrap_err(),
TestError {
span: span(<span class="number">1</span>..<span class="number">2</span>),
kind: ast::ErrorKind::ClassUnclosed,
}
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;[\b]&quot;</span>).parse().unwrap_err(),
TestError {
span: span(<span class="number">1</span>..<span class="number">3</span>),
kind: ast::ErrorKind::ClassEscapeInvalid,
}
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;[\w-a]&quot;</span>).parse().unwrap_err(),
TestError {
span: span(<span class="number">1</span>..<span class="number">3</span>),
kind: ast::ErrorKind::ClassRangeLiteral,
}
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;[a-\w]&quot;</span>).parse().unwrap_err(),
TestError {
span: span(<span class="number">3</span>..<span class="number">5</span>),
kind: ast::ErrorKind::ClassRangeLiteral,
}
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;[z-a]&quot;</span>).parse().unwrap_err(),
TestError {
span: span(<span class="number">1</span>..<span class="number">4</span>),
kind: ast::ErrorKind::ClassRangeInvalid,
}
);
<span class="macro">assert_eq!</span>(
parser_ignore_whitespace(<span class="string">&quot;[a &quot;</span>).parse().unwrap_err(),
TestError {
span: span(<span class="number">0</span>..<span class="number">1</span>),
kind: ast::ErrorKind::ClassUnclosed,
}
);
<span class="macro">assert_eq!</span>(
parser_ignore_whitespace(<span class="string">&quot;[a- &quot;</span>).parse().unwrap_err(),
TestError {
span: span(<span class="number">0</span>..<span class="number">1</span>),
kind: ast::ErrorKind::ClassUnclosed,
}
);
}
<span class="attribute">#[test]
</span><span class="kw">fn </span>parse_set_class_open() {
<span class="macro">assert_eq!</span>(parser(<span class="string">&quot;[a]&quot;</span>).parse_set_class_open(), {
<span class="kw">let </span>set = ast::ClassBracketed {
span: span(<span class="number">0</span>..<span class="number">1</span>),
negated: <span class="bool-val">false</span>,
kind: ast::ClassSet::union(ast::ClassSetUnion {
span: span(<span class="number">1</span>..<span class="number">1</span>),
items: <span class="macro">vec!</span>[],
}),
};
<span class="kw">let </span>union = ast::ClassSetUnion { span: span(<span class="number">1</span>..<span class="number">1</span>), items: <span class="macro">vec!</span>[] };
<span class="prelude-val">Ok</span>((set, union))
});
<span class="macro">assert_eq!</span>(
parser_ignore_whitespace(<span class="string">&quot;[ a]&quot;</span>).parse_set_class_open(),
{
<span class="kw">let </span>set = ast::ClassBracketed {
span: span(<span class="number">0</span>..<span class="number">4</span>),
negated: <span class="bool-val">false</span>,
kind: ast::ClassSet::union(ast::ClassSetUnion {
span: span(<span class="number">4</span>..<span class="number">4</span>),
items: <span class="macro">vec!</span>[],
}),
};
<span class="kw">let </span>union =
ast::ClassSetUnion { span: span(<span class="number">4</span>..<span class="number">4</span>), items: <span class="macro">vec!</span>[] };
<span class="prelude-val">Ok</span>((set, union))
}
);
<span class="macro">assert_eq!</span>(parser(<span class="string">&quot;[^a]&quot;</span>).parse_set_class_open(), {
<span class="kw">let </span>set = ast::ClassBracketed {
span: span(<span class="number">0</span>..<span class="number">2</span>),
negated: <span class="bool-val">true</span>,
kind: ast::ClassSet::union(ast::ClassSetUnion {
span: span(<span class="number">2</span>..<span class="number">2</span>),
items: <span class="macro">vec!</span>[],
}),
};
<span class="kw">let </span>union = ast::ClassSetUnion { span: span(<span class="number">2</span>..<span class="number">2</span>), items: <span class="macro">vec!</span>[] };
<span class="prelude-val">Ok</span>((set, union))
});
<span class="macro">assert_eq!</span>(
parser_ignore_whitespace(<span class="string">&quot;[ ^ a]&quot;</span>).parse_set_class_open(),
{
<span class="kw">let </span>set = ast::ClassBracketed {
span: span(<span class="number">0</span>..<span class="number">4</span>),
negated: <span class="bool-val">true</span>,
kind: ast::ClassSet::union(ast::ClassSetUnion {
span: span(<span class="number">4</span>..<span class="number">4</span>),
items: <span class="macro">vec!</span>[],
}),
};
<span class="kw">let </span>union =
ast::ClassSetUnion { span: span(<span class="number">4</span>..<span class="number">4</span>), items: <span class="macro">vec!</span>[] };
<span class="prelude-val">Ok</span>((set, union))
}
);
<span class="macro">assert_eq!</span>(parser(<span class="string">&quot;[-a]&quot;</span>).parse_set_class_open(), {
<span class="kw">let </span>set = ast::ClassBracketed {
span: span(<span class="number">0</span>..<span class="number">2</span>),
negated: <span class="bool-val">false</span>,
kind: ast::ClassSet::union(ast::ClassSetUnion {
span: span(<span class="number">1</span>..<span class="number">1</span>),
items: <span class="macro">vec!</span>[],
}),
};
<span class="kw">let </span>union = ast::ClassSetUnion {
span: span(<span class="number">1</span>..<span class="number">2</span>),
items: <span class="macro">vec!</span>[ast::ClassSetItem::Literal(ast::Literal {
span: span(<span class="number">1</span>..<span class="number">2</span>),
kind: ast::LiteralKind::Verbatim,
c: <span class="string">&#39;-&#39;</span>,
})],
};
<span class="prelude-val">Ok</span>((set, union))
});
<span class="macro">assert_eq!</span>(
parser_ignore_whitespace(<span class="string">&quot;[ - a]&quot;</span>).parse_set_class_open(),
{
<span class="kw">let </span>set = ast::ClassBracketed {
span: span(<span class="number">0</span>..<span class="number">4</span>),
negated: <span class="bool-val">false</span>,
kind: ast::ClassSet::union(ast::ClassSetUnion {
span: span(<span class="number">2</span>..<span class="number">2</span>),
items: <span class="macro">vec!</span>[],
}),
};
<span class="kw">let </span>union = ast::ClassSetUnion {
span: span(<span class="number">2</span>..<span class="number">3</span>),
items: <span class="macro">vec!</span>[ast::ClassSetItem::Literal(ast::Literal {
span: span(<span class="number">2</span>..<span class="number">3</span>),
kind: ast::LiteralKind::Verbatim,
c: <span class="string">&#39;-&#39;</span>,
})],
};
<span class="prelude-val">Ok</span>((set, union))
}
);
<span class="macro">assert_eq!</span>(parser(<span class="string">&quot;[^-a]&quot;</span>).parse_set_class_open(), {
<span class="kw">let </span>set = ast::ClassBracketed {
span: span(<span class="number">0</span>..<span class="number">3</span>),
negated: <span class="bool-val">true</span>,
kind: ast::ClassSet::union(ast::ClassSetUnion {
span: span(<span class="number">2</span>..<span class="number">2</span>),
items: <span class="macro">vec!</span>[],
}),
};
<span class="kw">let </span>union = ast::ClassSetUnion {
span: span(<span class="number">2</span>..<span class="number">3</span>),
items: <span class="macro">vec!</span>[ast::ClassSetItem::Literal(ast::Literal {
span: span(<span class="number">2</span>..<span class="number">3</span>),
kind: ast::LiteralKind::Verbatim,
c: <span class="string">&#39;-&#39;</span>,
})],
};
<span class="prelude-val">Ok</span>((set, union))
});
<span class="macro">assert_eq!</span>(parser(<span class="string">&quot;[--a]&quot;</span>).parse_set_class_open(), {
<span class="kw">let </span>set = ast::ClassBracketed {
span: span(<span class="number">0</span>..<span class="number">3</span>),
negated: <span class="bool-val">false</span>,
kind: ast::ClassSet::union(ast::ClassSetUnion {
span: span(<span class="number">1</span>..<span class="number">1</span>),
items: <span class="macro">vec!</span>[],
}),
};
<span class="kw">let </span>union = ast::ClassSetUnion {
span: span(<span class="number">1</span>..<span class="number">3</span>),
items: <span class="macro">vec!</span>[
ast::ClassSetItem::Literal(ast::Literal {
span: span(<span class="number">1</span>..<span class="number">2</span>),
kind: ast::LiteralKind::Verbatim,
c: <span class="string">&#39;-&#39;</span>,
}),
ast::ClassSetItem::Literal(ast::Literal {
span: span(<span class="number">2</span>..<span class="number">3</span>),
kind: ast::LiteralKind::Verbatim,
c: <span class="string">&#39;-&#39;</span>,
}),
],
};
<span class="prelude-val">Ok</span>((set, union))
});
<span class="macro">assert_eq!</span>(parser(<span class="string">&quot;[]a]&quot;</span>).parse_set_class_open(), {
<span class="kw">let </span>set = ast::ClassBracketed {
span: span(<span class="number">0</span>..<span class="number">2</span>),
negated: <span class="bool-val">false</span>,
kind: ast::ClassSet::union(ast::ClassSetUnion {
span: span(<span class="number">1</span>..<span class="number">1</span>),
items: <span class="macro">vec!</span>[],
}),
};
<span class="kw">let </span>union = ast::ClassSetUnion {
span: span(<span class="number">1</span>..<span class="number">2</span>),
items: <span class="macro">vec!</span>[ast::ClassSetItem::Literal(ast::Literal {
span: span(<span class="number">1</span>..<span class="number">2</span>),
kind: ast::LiteralKind::Verbatim,
c: <span class="string">&#39;]&#39;</span>,
})],
};
<span class="prelude-val">Ok</span>((set, union))
});
<span class="macro">assert_eq!</span>(
parser_ignore_whitespace(<span class="string">&quot;[ ] a]&quot;</span>).parse_set_class_open(),
{
<span class="kw">let </span>set = ast::ClassBracketed {
span: span(<span class="number">0</span>..<span class="number">4</span>),
negated: <span class="bool-val">false</span>,
kind: ast::ClassSet::union(ast::ClassSetUnion {
span: span(<span class="number">2</span>..<span class="number">2</span>),
items: <span class="macro">vec!</span>[],
}),
};
<span class="kw">let </span>union = ast::ClassSetUnion {
span: span(<span class="number">2</span>..<span class="number">3</span>),
items: <span class="macro">vec!</span>[ast::ClassSetItem::Literal(ast::Literal {
span: span(<span class="number">2</span>..<span class="number">3</span>),
kind: ast::LiteralKind::Verbatim,
c: <span class="string">&#39;]&#39;</span>,
})],
};
<span class="prelude-val">Ok</span>((set, union))
}
);
<span class="macro">assert_eq!</span>(parser(<span class="string">&quot;[^]a]&quot;</span>).parse_set_class_open(), {
<span class="kw">let </span>set = ast::ClassBracketed {
span: span(<span class="number">0</span>..<span class="number">3</span>),
negated: <span class="bool-val">true</span>,
kind: ast::ClassSet::union(ast::ClassSetUnion {
span: span(<span class="number">2</span>..<span class="number">2</span>),
items: <span class="macro">vec!</span>[],
}),
};
<span class="kw">let </span>union = ast::ClassSetUnion {
span: span(<span class="number">2</span>..<span class="number">3</span>),
items: <span class="macro">vec!</span>[ast::ClassSetItem::Literal(ast::Literal {
span: span(<span class="number">2</span>..<span class="number">3</span>),
kind: ast::LiteralKind::Verbatim,
c: <span class="string">&#39;]&#39;</span>,
})],
};
<span class="prelude-val">Ok</span>((set, union))
});
<span class="macro">assert_eq!</span>(parser(<span class="string">&quot;[-]a]&quot;</span>).parse_set_class_open(), {
<span class="kw">let </span>set = ast::ClassBracketed {
span: span(<span class="number">0</span>..<span class="number">2</span>),
negated: <span class="bool-val">false</span>,
kind: ast::ClassSet::union(ast::ClassSetUnion {
span: span(<span class="number">1</span>..<span class="number">1</span>),
items: <span class="macro">vec!</span>[],
}),
};
<span class="kw">let </span>union = ast::ClassSetUnion {
span: span(<span class="number">1</span>..<span class="number">2</span>),
items: <span class="macro">vec!</span>[ast::ClassSetItem::Literal(ast::Literal {
span: span(<span class="number">1</span>..<span class="number">2</span>),
kind: ast::LiteralKind::Verbatim,
c: <span class="string">&#39;-&#39;</span>,
})],
};
<span class="prelude-val">Ok</span>((set, union))
});
<span class="macro">assert_eq!</span>(
parser(<span class="string">&quot;[&quot;</span>).parse_set_class_open().unwrap_err(),
TestError {
span: span(<span class="number">0</span>..<span class="number">1</span>),
kind: ast::ErrorKind::ClassUnclosed,
}
);
<span class="macro">assert_eq!</span>(
parser_ignore_whitespace(<span class="string">&quot;[ &quot;</span>)
.parse_set_class_open()
.unwrap_err(),
TestError {
span: span(<span class="number">0</span>..<span class="number">5</span>),
kind: ast::ErrorKind::ClassUnclosed,
}
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">&quot;[^&quot;</span>).parse_set_class_open().unwrap_err(),
TestError {
span: span(<span class="number">0</span>..<span class="number">2</span>),
kind: ast::ErrorKind::ClassUnclosed,
}
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">&quot;[]&quot;</span>).parse_set_class_open().unwrap_err(),
TestError {
span: span(<span class="number">0</span>..<span class="number">2</span>),
kind: ast::ErrorKind::ClassUnclosed,
}
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">&quot;[-&quot;</span>).parse_set_class_open().unwrap_err(),
TestError {
span: span(<span class="number">0</span>..<span class="number">0</span>),
kind: ast::ErrorKind::ClassUnclosed,
}
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">&quot;[--&quot;</span>).parse_set_class_open().unwrap_err(),
TestError {
span: span(<span class="number">0</span>..<span class="number">0</span>),
kind: ast::ErrorKind::ClassUnclosed,
}
);
<span class="comment">// See: https://github.com/rust-lang/regex/issues/792
</span><span class="macro">assert_eq!</span>(
parser(<span class="string">&quot;(?x)[-#]&quot;</span>).parse_with_comments().unwrap_err(),
TestError {
span: span(<span class="number">4</span>..<span class="number">4</span>),
kind: ast::ErrorKind::ClassUnclosed,
}
);
}
<span class="attribute">#[test]
</span><span class="kw">fn </span>maybe_parse_ascii_class() {
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;[:alnum:]&quot;</span>).maybe_parse_ascii_class(),
<span class="prelude-val">Some</span>(ast::ClassAscii {
span: span(<span class="number">0</span>..<span class="number">9</span>),
kind: ast::ClassAsciiKind::Alnum,
negated: <span class="bool-val">false</span>,
})
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;[:alnum:]A&quot;</span>).maybe_parse_ascii_class(),
<span class="prelude-val">Some</span>(ast::ClassAscii {
span: span(<span class="number">0</span>..<span class="number">9</span>),
kind: ast::ClassAsciiKind::Alnum,
negated: <span class="bool-val">false</span>,
})
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;[:^alnum:]&quot;</span>).maybe_parse_ascii_class(),
<span class="prelude-val">Some</span>(ast::ClassAscii {
span: span(<span class="number">0</span>..<span class="number">10</span>),
kind: ast::ClassAsciiKind::Alnum,
negated: <span class="bool-val">true</span>,
})
);
<span class="kw">let </span>p = parser(<span class="string">r&quot;[:&quot;</span>);
<span class="macro">assert_eq!</span>(p.maybe_parse_ascii_class(), <span class="prelude-val">None</span>);
<span class="macro">assert_eq!</span>(p.offset(), <span class="number">0</span>);
<span class="kw">let </span>p = parser(<span class="string">r&quot;[:^&quot;</span>);
<span class="macro">assert_eq!</span>(p.maybe_parse_ascii_class(), <span class="prelude-val">None</span>);
<span class="macro">assert_eq!</span>(p.offset(), <span class="number">0</span>);
<span class="kw">let </span>p = parser(<span class="string">r&quot;[^:alnum:]&quot;</span>);
<span class="macro">assert_eq!</span>(p.maybe_parse_ascii_class(), <span class="prelude-val">None</span>);
<span class="macro">assert_eq!</span>(p.offset(), <span class="number">0</span>);
<span class="kw">let </span>p = parser(<span class="string">r&quot;[:alnnum:]&quot;</span>);
<span class="macro">assert_eq!</span>(p.maybe_parse_ascii_class(), <span class="prelude-val">None</span>);
<span class="macro">assert_eq!</span>(p.offset(), <span class="number">0</span>);
<span class="kw">let </span>p = parser(<span class="string">r&quot;[:alnum]&quot;</span>);
<span class="macro">assert_eq!</span>(p.maybe_parse_ascii_class(), <span class="prelude-val">None</span>);
<span class="macro">assert_eq!</span>(p.offset(), <span class="number">0</span>);
<span class="kw">let </span>p = parser(<span class="string">r&quot;[:alnum:&quot;</span>);
<span class="macro">assert_eq!</span>(p.maybe_parse_ascii_class(), <span class="prelude-val">None</span>);
<span class="macro">assert_eq!</span>(p.offset(), <span class="number">0</span>);
}
<span class="attribute">#[test]
</span><span class="kw">fn </span>parse_unicode_class() {
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;\pN&quot;</span>).parse_escape(),
<span class="prelude-val">Ok</span>(Primitive::Unicode(ast::ClassUnicode {
span: span(<span class="number">0</span>..<span class="number">3</span>),
negated: <span class="bool-val">false</span>,
kind: ast::ClassUnicodeKind::OneLetter(<span class="string">&#39;N&#39;</span>),
}))
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;\PN&quot;</span>).parse_escape(),
<span class="prelude-val">Ok</span>(Primitive::Unicode(ast::ClassUnicode {
span: span(<span class="number">0</span>..<span class="number">3</span>),
negated: <span class="bool-val">true</span>,
kind: ast::ClassUnicodeKind::OneLetter(<span class="string">&#39;N&#39;</span>),
}))
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;\p{N}&quot;</span>).parse_escape(),
<span class="prelude-val">Ok</span>(Primitive::Unicode(ast::ClassUnicode {
span: span(<span class="number">0</span>..<span class="number">5</span>),
negated: <span class="bool-val">false</span>,
kind: ast::ClassUnicodeKind::Named(s(<span class="string">&quot;N&quot;</span>)),
}))
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;\P{N}&quot;</span>).parse_escape(),
<span class="prelude-val">Ok</span>(Primitive::Unicode(ast::ClassUnicode {
span: span(<span class="number">0</span>..<span class="number">5</span>),
negated: <span class="bool-val">true</span>,
kind: ast::ClassUnicodeKind::Named(s(<span class="string">&quot;N&quot;</span>)),
}))
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;\p{Greek}&quot;</span>).parse_escape(),
<span class="prelude-val">Ok</span>(Primitive::Unicode(ast::ClassUnicode {
span: span(<span class="number">0</span>..<span class="number">9</span>),
negated: <span class="bool-val">false</span>,
kind: ast::ClassUnicodeKind::Named(s(<span class="string">&quot;Greek&quot;</span>)),
}))
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;\p{scx:Katakana}&quot;</span>).parse_escape(),
<span class="prelude-val">Ok</span>(Primitive::Unicode(ast::ClassUnicode {
span: span(<span class="number">0</span>..<span class="number">16</span>),
negated: <span class="bool-val">false</span>,
kind: ast::ClassUnicodeKind::NamedValue {
op: ast::ClassUnicodeOpKind::Colon,
name: s(<span class="string">&quot;scx&quot;</span>),
value: s(<span class="string">&quot;Katakana&quot;</span>),
},
}))
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;\p{scx=Katakana}&quot;</span>).parse_escape(),
<span class="prelude-val">Ok</span>(Primitive::Unicode(ast::ClassUnicode {
span: span(<span class="number">0</span>..<span class="number">16</span>),
negated: <span class="bool-val">false</span>,
kind: ast::ClassUnicodeKind::NamedValue {
op: ast::ClassUnicodeOpKind::Equal,
name: s(<span class="string">&quot;scx&quot;</span>),
value: s(<span class="string">&quot;Katakana&quot;</span>),
},
}))
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;\p{scx!=Katakana}&quot;</span>).parse_escape(),
<span class="prelude-val">Ok</span>(Primitive::Unicode(ast::ClassUnicode {
span: span(<span class="number">0</span>..<span class="number">17</span>),
negated: <span class="bool-val">false</span>,
kind: ast::ClassUnicodeKind::NamedValue {
op: ast::ClassUnicodeOpKind::NotEqual,
name: s(<span class="string">&quot;scx&quot;</span>),
value: s(<span class="string">&quot;Katakana&quot;</span>),
},
}))
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;\p{:}&quot;</span>).parse_escape(),
<span class="prelude-val">Ok</span>(Primitive::Unicode(ast::ClassUnicode {
span: span(<span class="number">0</span>..<span class="number">5</span>),
negated: <span class="bool-val">false</span>,
kind: ast::ClassUnicodeKind::NamedValue {
op: ast::ClassUnicodeOpKind::Colon,
name: s(<span class="string">&quot;&quot;</span>),
value: s(<span class="string">&quot;&quot;</span>),
},
}))
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;\p{=}&quot;</span>).parse_escape(),
<span class="prelude-val">Ok</span>(Primitive::Unicode(ast::ClassUnicode {
span: span(<span class="number">0</span>..<span class="number">5</span>),
negated: <span class="bool-val">false</span>,
kind: ast::ClassUnicodeKind::NamedValue {
op: ast::ClassUnicodeOpKind::Equal,
name: s(<span class="string">&quot;&quot;</span>),
value: s(<span class="string">&quot;&quot;</span>),
},
}))
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;\p{!=}&quot;</span>).parse_escape(),
<span class="prelude-val">Ok</span>(Primitive::Unicode(ast::ClassUnicode {
span: span(<span class="number">0</span>..<span class="number">6</span>),
negated: <span class="bool-val">false</span>,
kind: ast::ClassUnicodeKind::NamedValue {
op: ast::ClassUnicodeOpKind::NotEqual,
name: s(<span class="string">&quot;&quot;</span>),
value: s(<span class="string">&quot;&quot;</span>),
},
}))
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;\p&quot;</span>).parse_escape().unwrap_err(),
TestError {
span: span(<span class="number">2</span>..<span class="number">2</span>),
kind: ast::ErrorKind::EscapeUnexpectedEof,
}
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;\p{&quot;</span>).parse_escape().unwrap_err(),
TestError {
span: span(<span class="number">3</span>..<span class="number">3</span>),
kind: ast::ErrorKind::EscapeUnexpectedEof,
}
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;\p{N&quot;</span>).parse_escape().unwrap_err(),
TestError {
span: span(<span class="number">4</span>..<span class="number">4</span>),
kind: ast::ErrorKind::EscapeUnexpectedEof,
}
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;\p{Greek&quot;</span>).parse_escape().unwrap_err(),
TestError {
span: span(<span class="number">8</span>..<span class="number">8</span>),
kind: ast::ErrorKind::EscapeUnexpectedEof,
}
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;\pNz&quot;</span>).parse(),
<span class="prelude-val">Ok</span>(Ast::Concat(ast::Concat {
span: span(<span class="number">0</span>..<span class="number">4</span>),
asts: <span class="macro">vec!</span>[
Ast::Class(ast::Class::Unicode(ast::ClassUnicode {
span: span(<span class="number">0</span>..<span class="number">3</span>),
negated: <span class="bool-val">false</span>,
kind: ast::ClassUnicodeKind::OneLetter(<span class="string">&#39;N&#39;</span>),
})),
Ast::Literal(ast::Literal {
span: span(<span class="number">3</span>..<span class="number">4</span>),
kind: ast::LiteralKind::Verbatim,
c: <span class="string">&#39;z&#39;</span>,
}),
],
}))
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;\p{Greek}z&quot;</span>).parse(),
<span class="prelude-val">Ok</span>(Ast::Concat(ast::Concat {
span: span(<span class="number">0</span>..<span class="number">10</span>),
asts: <span class="macro">vec!</span>[
Ast::Class(ast::Class::Unicode(ast::ClassUnicode {
span: span(<span class="number">0</span>..<span class="number">9</span>),
negated: <span class="bool-val">false</span>,
kind: ast::ClassUnicodeKind::Named(s(<span class="string">&quot;Greek&quot;</span>)),
})),
Ast::Literal(ast::Literal {
span: span(<span class="number">9</span>..<span class="number">10</span>),
kind: ast::LiteralKind::Verbatim,
c: <span class="string">&#39;z&#39;</span>,
}),
],
}))
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;\p\{&quot;</span>).parse().unwrap_err(),
TestError {
span: span(<span class="number">2</span>..<span class="number">3</span>),
kind: ast::ErrorKind::UnicodeClassInvalid,
}
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;\P\{&quot;</span>).parse().unwrap_err(),
TestError {
span: span(<span class="number">2</span>..<span class="number">3</span>),
kind: ast::ErrorKind::UnicodeClassInvalid,
}
);
}
<span class="attribute">#[test]
</span><span class="kw">fn </span>parse_perl_class() {
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;\d&quot;</span>).parse_escape(),
<span class="prelude-val">Ok</span>(Primitive::Perl(ast::ClassPerl {
span: span(<span class="number">0</span>..<span class="number">2</span>),
kind: ast::ClassPerlKind::Digit,
negated: <span class="bool-val">false</span>,
}))
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;\D&quot;</span>).parse_escape(),
<span class="prelude-val">Ok</span>(Primitive::Perl(ast::ClassPerl {
span: span(<span class="number">0</span>..<span class="number">2</span>),
kind: ast::ClassPerlKind::Digit,
negated: <span class="bool-val">true</span>,
}))
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;\s&quot;</span>).parse_escape(),
<span class="prelude-val">Ok</span>(Primitive::Perl(ast::ClassPerl {
span: span(<span class="number">0</span>..<span class="number">2</span>),
kind: ast::ClassPerlKind::Space,
negated: <span class="bool-val">false</span>,
}))
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;\S&quot;</span>).parse_escape(),
<span class="prelude-val">Ok</span>(Primitive::Perl(ast::ClassPerl {
span: span(<span class="number">0</span>..<span class="number">2</span>),
kind: ast::ClassPerlKind::Space,
negated: <span class="bool-val">true</span>,
}))
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;\w&quot;</span>).parse_escape(),
<span class="prelude-val">Ok</span>(Primitive::Perl(ast::ClassPerl {
span: span(<span class="number">0</span>..<span class="number">2</span>),
kind: ast::ClassPerlKind::Word,
negated: <span class="bool-val">false</span>,
}))
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;\W&quot;</span>).parse_escape(),
<span class="prelude-val">Ok</span>(Primitive::Perl(ast::ClassPerl {
span: span(<span class="number">0</span>..<span class="number">2</span>),
kind: ast::ClassPerlKind::Word,
negated: <span class="bool-val">true</span>,
}))
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;\d&quot;</span>).parse(),
<span class="prelude-val">Ok</span>(Ast::Class(ast::Class::Perl(ast::ClassPerl {
span: span(<span class="number">0</span>..<span class="number">2</span>),
kind: ast::ClassPerlKind::Digit,
negated: <span class="bool-val">false</span>,
})))
);
<span class="macro">assert_eq!</span>(
parser(<span class="string">r&quot;\dz&quot;</span>).parse(),
<span class="prelude-val">Ok</span>(Ast::Concat(ast::Concat {
span: span(<span class="number">0</span>..<span class="number">3</span>),
asts: <span class="macro">vec!</span>[
Ast::Class(ast::Class::Perl(ast::ClassPerl {
span: span(<span class="number">0</span>..<span class="number">2</span>),
kind: ast::ClassPerlKind::Digit,
negated: <span class="bool-val">false</span>,
})),
Ast::Literal(ast::Literal {
span: span(<span class="number">2</span>..<span class="number">3</span>),
kind: ast::LiteralKind::Verbatim,
c: <span class="string">&#39;z&#39;</span>,
}),
],
}))
);
}
<span class="comment">// This tests a bug fix where the nest limit checker wasn&#39;t decrementing
// its depth during post-traversal, which causes long regexes to trip
// the default limit too aggressively.
</span><span class="attribute">#[test]
</span><span class="kw">fn </span>regression_454_nest_too_big() {
<span class="kw">let </span>pattern = <span class="string">r#&quot;
2(?:
[45]\d{3}|
7(?:
1[0-267]|
2[0-289]|
3[0-29]|
4[01]|
5[1-3]|
6[013]|
7[0178]|
91
)|
8(?:
0[125]|
[139][1-6]|
2[0157-9]|
41|
6[1-35]|
7[1-5]|
8[1-8]|
90
)|
9(?:
0[0-2]|
1[0-4]|
2[568]|
3[3-6]|
5[5-7]|
6[0167]|
7[15]|
8[0146-9]
)
)\d{4}
&quot;#</span>;
<span class="macro">assert!</span>(parser_nest_limit(pattern, <span class="number">50</span>).parse().is_ok());
}
<span class="comment">// This tests that we treat a trailing `-` in a character class as a
// literal `-` even when whitespace mode is enabled and there is whitespace
// after the trailing `-`.
</span><span class="attribute">#[test]
</span><span class="kw">fn </span>regression_455_trailing_dash_ignore_whitespace() {
<span class="macro">assert!</span>(parser(<span class="string">&quot;(?x)[ / - ]&quot;</span>).parse().is_ok());
<span class="macro">assert!</span>(parser(<span class="string">&quot;(?x)[ a - ]&quot;</span>).parse().is_ok());
<span class="macro">assert!</span>(parser(
<span class="string">&quot;(?x)[
a
- ]
&quot;
</span>)
.parse()
.is_ok());
<span class="macro">assert!</span>(parser(
<span class="string">&quot;(?x)[
a # wat
- ]
&quot;
</span>)
.parse()
.is_ok());
<span class="macro">assert!</span>(parser(<span class="string">&quot;(?x)[ / -&quot;</span>).parse().is_err());
<span class="macro">assert!</span>(parser(<span class="string">&quot;(?x)[ / - &quot;</span>).parse().is_err());
<span class="macro">assert!</span>(parser(
<span class="string">&quot;(?x)[
/ -
&quot;
</span>)
.parse()
.is_err());
<span class="macro">assert!</span>(parser(
<span class="string">&quot;(?x)[
/ - # wat
&quot;
</span>)
.parse()
.is_err());
}
}
</code></pre></div>
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