| <!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/hir/mod.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>mod.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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| <span id="3739">3739</span> |
| </pre><pre class="rust"><code><span class="doccomment">/*! |
| Defines a high-level intermediate (HIR) representation for regular expressions. |
| |
| The HIR is represented by the [`Hir`] type, and it principally constructed via |
| [translation](translate) from an [`Ast`](crate::ast::Ast). Alternatively, users |
| may use the smart constructors defined on `Hir` to build their own by hand. The |
| smart constructors simultaneously simplify and "optimize" the HIR, and are also |
| the same routines used by translation. |
| |
| Most regex engines only have an HIR like this, and usually construct it |
| directly from the concrete syntax. This crate however first parses the |
| concrete syntax into an `Ast`, and only then creates the HIR from the `Ast`, |
| as mentioned above. It's done this way to facilitate better error reporting, |
| and to have a structured representation of a regex that faithfully represents |
| its concrete syntax. Namely, while an `Hir` value can be converted back to an |
| equivalent regex pattern string, it is unlikely to look like the original due |
| to its simplified structure. |
| */ |
| |
| </span><span class="kw">use </span>core::{char, cmp}; |
| |
| <span class="kw">use </span>alloc::{ |
| boxed::Box, |
| format, |
| string::{String, ToString}, |
| vec, |
| vec::Vec, |
| }; |
| |
| <span class="kw">use crate</span>::{ |
| ast::Span, |
| hir::interval::{Interval, IntervalSet, IntervalSetIter}, |
| unicode, |
| }; |
| |
| <span class="kw">pub use crate</span>::{ |
| hir::visitor::{visit, Visitor}, |
| unicode::CaseFoldError, |
| }; |
| |
| <span class="kw">mod </span>interval; |
| <span class="kw">pub mod </span>literal; |
| <span class="kw">pub mod </span>print; |
| <span class="kw">pub mod </span>translate; |
| <span class="kw">mod </span>visitor; |
| |
| <span class="doccomment">/// An error that can occur while translating an `Ast` to a `Hir`. |
| </span><span class="attribute">#[derive(Clone, Debug, Eq, PartialEq)] |
| </span><span class="kw">pub struct </span>Error { |
| <span class="doccomment">/// The kind of error. |
| </span>kind: ErrorKind, |
| <span class="doccomment">/// The original pattern that the translator's Ast was parsed from. Every |
| /// span in an error is a valid range into this string. |
| </span>pattern: String, |
| <span class="doccomment">/// The span of this error, derived from the Ast given to the translator. |
| </span>span: Span, |
| } |
| |
| <span class="kw">impl </span>Error { |
| <span class="doccomment">/// Return the type of this error. |
| </span><span class="kw">pub fn </span>kind(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span>ErrorKind { |
| <span class="kw-2">&</span><span class="self">self</span>.kind |
| } |
| |
| <span class="doccomment">/// The original pattern string in which this error occurred. |
| /// |
| /// Every span reported by this error is reported in terms of this string. |
| </span><span class="kw">pub fn </span>pattern(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span>str { |
| <span class="kw-2">&</span><span class="self">self</span>.pattern |
| } |
| |
| <span class="doccomment">/// Return the span at which this error occurred. |
| </span><span class="kw">pub fn </span>span(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span>Span { |
| <span class="kw-2">&</span><span class="self">self</span>.span |
| } |
| } |
| |
| <span class="doccomment">/// The type of an error that occurred while building an `Hir`. |
| /// |
| /// This error type is marked as `non_exhaustive`. This means that adding a |
| /// new variant is not considered a breaking change. |
| </span><span class="attribute">#[non_exhaustive] |
| #[derive(Clone, Debug, Eq, PartialEq)] |
| </span><span class="kw">pub enum </span>ErrorKind { |
| <span class="doccomment">/// This error occurs when a Unicode feature is used when Unicode |
| /// support is disabled. For example `(?-u:\pL)` would trigger this error. |
| </span>UnicodeNotAllowed, |
| <span class="doccomment">/// This error occurs when translating a pattern that could match a byte |
| /// sequence that isn't UTF-8 and `utf8` was enabled. |
| </span>InvalidUtf8, |
| <span class="doccomment">/// This occurs when an unrecognized Unicode property name could not |
| /// be found. |
| </span>UnicodePropertyNotFound, |
| <span class="doccomment">/// This occurs when an unrecognized Unicode property value could not |
| /// be found. |
| </span>UnicodePropertyValueNotFound, |
| <span class="doccomment">/// This occurs when a Unicode-aware Perl character class (`\w`, `\s` or |
| /// `\d`) could not be found. This can occur when the `unicode-perl` |
| /// crate feature is not enabled. |
| </span>UnicodePerlClassNotFound, |
| <span class="doccomment">/// This occurs when the Unicode simple case mapping tables are not |
| /// available, and the regular expression required Unicode aware case |
| /// insensitivity. |
| </span>UnicodeCaseUnavailable, |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"std"</span>)] |
| </span><span class="kw">impl </span>std::error::Error <span class="kw">for </span>Error {} |
| |
| <span class="kw">impl </span>core::fmt::Display <span class="kw">for </span>Error { |
| <span class="kw">fn </span>fmt(<span class="kw-2">&</span><span class="self">self</span>, f: <span class="kw-2">&mut </span>core::fmt::Formatter<<span class="lifetime">'_</span>>) -> core::fmt::Result { |
| <span class="kw">crate</span>::error::Formatter::from(<span class="self">self</span>).fmt(f) |
| } |
| } |
| |
| <span class="kw">impl </span>core::fmt::Display <span class="kw">for </span>ErrorKind { |
| <span class="kw">fn </span>fmt(<span class="kw-2">&</span><span class="self">self</span>, f: <span class="kw-2">&mut </span>core::fmt::Formatter<<span class="lifetime">'_</span>>) -> core::fmt::Result { |
| <span class="kw">use </span><span class="self">self</span>::ErrorKind::<span class="kw-2">*</span>; |
| |
| <span class="kw">let </span>msg = <span class="kw">match </span><span class="kw-2">*</span><span class="self">self </span>{ |
| UnicodeNotAllowed => <span class="string">"Unicode not allowed here"</span>, |
| InvalidUtf8 => <span class="string">"pattern can match invalid UTF-8"</span>, |
| UnicodePropertyNotFound => <span class="string">"Unicode property not found"</span>, |
| UnicodePropertyValueNotFound => <span class="string">"Unicode property value not found"</span>, |
| UnicodePerlClassNotFound => { |
| <span class="string">"Unicode-aware Perl class not found \ |
| (make sure the unicode-perl feature is enabled)" |
| </span>} |
| UnicodeCaseUnavailable => { |
| <span class="string">"Unicode-aware case insensitivity matching is not available \ |
| (make sure the unicode-case feature is enabled)" |
| </span>} |
| }; |
| f.write_str(msg) |
| } |
| } |
| |
| <span class="doccomment">/// A high-level intermediate representation (HIR) for a regular expression. |
| /// |
| /// An HIR value is a combination of a [`HirKind`] and a set of [`Properties`]. |
| /// An `HirKind` indicates what kind of regular expression it is (a literal, |
| /// a repetition, a look-around assertion, etc.), where as a `Properties` |
| /// describes various facts about the regular expression. For example, whether |
| /// it matches UTF-8 or if it matches the empty string. |
| /// |
| /// The HIR of a regular expression represents an intermediate step between |
| /// its abstract syntax (a structured description of the concrete syntax) and |
| /// an actual regex matcher. The purpose of HIR is to make regular expressions |
| /// easier to analyze. In particular, the AST is much more complex than the |
| /// HIR. For example, while an AST supports arbitrarily nested character |
| /// classes, the HIR will flatten all nested classes into a single set. The HIR |
| /// will also "compile away" every flag present in the concrete syntax. For |
| /// example, users of HIR expressions never need to worry about case folding; |
| /// it is handled automatically by the translator (e.g., by translating |
| /// `(?i:A)` to `[aA]`). |
| /// |
| /// The specific type of an HIR expression can be accessed via its `kind` |
| /// or `into_kind` methods. This extra level of indirection exists for two |
| /// reasons: |
| /// |
| /// 1. Construction of an HIR expression *must* use the constructor methods on |
| /// this `Hir` type instead of building the `HirKind` values directly. This |
| /// permits construction to enforce invariants like "concatenations always |
| /// consist of two or more sub-expressions." |
| /// 2. Every HIR expression contains attributes that are defined inductively, |
| /// and can be computed cheaply during the construction process. For example, |
| /// one such attribute is whether the expression must match at the beginning of |
| /// the haystack. |
| /// |
| /// In particular, if you have an `HirKind` value, then there is intentionally |
| /// no way to build an `Hir` value from it. You instead need to do case |
| /// analysis on the `HirKind` value and build the `Hir` value using its smart |
| /// constructors. |
| /// |
| /// # UTF-8 |
| /// |
| /// If the HIR was produced by a translator with |
| /// [`TranslatorBuilder::utf8`](translate::TranslatorBuilder::utf8) enabled, |
| /// then the HIR is guaranteed to match UTF-8 exclusively for all non-empty |
| /// matches. |
| /// |
| /// For empty matches, those can occur at any position. It is the |
| /// repsonsibility of the regex engine to determine whether empty matches are |
| /// permitted between the code units of a single codepoint. |
| /// |
| /// # Stack space |
| /// |
| /// This type defines its own destructor that uses constant stack space and |
| /// heap space proportional to the size of the HIR. |
| /// |
| /// Also, an `Hir`'s `fmt::Display` implementation prints an HIR as a regular |
| /// expression pattern string, and uses constant stack space and heap space |
| /// proportional to the size of the `Hir`. The regex it prints is guaranteed to |
| /// be _semantically_ equivalent to the original concrete syntax, but it may |
| /// look very different. (And potentially not practically readable by a human.) |
| /// |
| /// An `Hir`'s `fmt::Debug` implementation currently does not use constant |
| /// stack space. The implementation will also suppress some details (such as |
| /// the `Properties` inlined into every `Hir` value to make it less noisy). |
| </span><span class="attribute">#[derive(Clone, Eq, PartialEq)] |
| </span><span class="kw">pub struct </span>Hir { |
| <span class="doccomment">/// The underlying HIR kind. |
| </span>kind: HirKind, |
| <span class="doccomment">/// Analysis info about this HIR, computed during construction. |
| </span>props: Properties, |
| } |
| |
| <span class="doccomment">/// Methods for accessing the underlying `HirKind` and `Properties`. |
| </span><span class="kw">impl </span>Hir { |
| <span class="doccomment">/// Returns a reference to the underlying HIR kind. |
| </span><span class="kw">pub fn </span>kind(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span>HirKind { |
| <span class="kw-2">&</span><span class="self">self</span>.kind |
| } |
| |
| <span class="doccomment">/// Consumes ownership of this HIR expression and returns its underlying |
| /// `HirKind`. |
| </span><span class="kw">pub fn </span>into_kind(<span class="kw-2">mut </span><span class="self">self</span>) -> HirKind { |
| core::mem::replace(<span class="kw-2">&mut </span><span class="self">self</span>.kind, HirKind::Empty) |
| } |
| |
| <span class="doccomment">/// Returns the properties computed for this `Hir`. |
| </span><span class="kw">pub fn </span>properties(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span>Properties { |
| <span class="kw-2">&</span><span class="self">self</span>.props |
| } |
| |
| <span class="doccomment">/// Splits this HIR into its constituent parts. |
| /// |
| /// This is useful because `let Hir { kind, props } = hir;` does not work |
| /// because of `Hir`'s custom `Drop` implementation. |
| </span><span class="kw">fn </span>into_parts(<span class="kw-2">mut </span><span class="self">self</span>) -> (HirKind, Properties) { |
| ( |
| core::mem::replace(<span class="kw-2">&mut </span><span class="self">self</span>.kind, HirKind::Empty), |
| core::mem::replace(<span class="kw-2">&mut </span><span class="self">self</span>.props, Properties::empty()), |
| ) |
| } |
| } |
| |
| <span class="doccomment">/// Smart constructors for HIR values. |
| /// |
| /// These constructors are called "smart" because they do inductive work or |
| /// simplifications. For example, calling `Hir::repetition` with a repetition |
| /// like `a{0}` will actually return a `Hir` with a `HirKind::Empty` kind |
| /// since it is equivalent to an empty regex. Another example is calling |
| /// `Hir::concat(vec![expr])`. Instead of getting a `HirKind::Concat`, you'll |
| /// just get back the original `expr` since it's precisely equivalent. |
| /// |
| /// Smart constructors enable maintaining invariants about the HIR data type |
| /// while also simulanteously keeping the representation as simple as possible. |
| </span><span class="kw">impl </span>Hir { |
| <span class="doccomment">/// Returns an empty HIR expression. |
| /// |
| /// An empty HIR expression always matches, including the empty string. |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>empty() -> Hir { |
| <span class="kw">let </span>props = Properties::empty(); |
| Hir { kind: HirKind::Empty, props } |
| } |
| |
| <span class="doccomment">/// Returns an HIR expression that can never match anything. That is, |
| /// the size of the set of strings in the language described by the HIR |
| /// returned is `0`. |
| /// |
| /// This is distinct from [`Hir::empty`] in that the empty string matches |
| /// the HIR returned by `Hir::empty`. That is, the set of strings in the |
| /// language describe described by `Hir::empty` is non-empty. |
| /// |
| /// Note that currently, the HIR returned uses an empty character class to |
| /// indicate that nothing can match. An equivalent expression that cannot |
| /// match is an empty alternation, but all such "fail" expressions are |
| /// normalized (via smart constructors) to empty character classes. This is |
| /// because empty character classes can be spelled in the concrete syntax |
| /// of a regex (e.g., `\P{any}` or `(?-u:[^\x00-\xFF])` or `[a&&b]`), but |
| /// empty alternations cannot. |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>fail() -> Hir { |
| <span class="kw">let </span>class = Class::Bytes(ClassBytes::empty()); |
| <span class="kw">let </span>props = Properties::class(<span class="kw-2">&</span>class); |
| <span class="comment">// We can't just call Hir::class here because it defers to Hir::fail |
| // in order to canonicalize the Hir value used to represent "cannot |
| // match." |
| </span>Hir { kind: HirKind::Class(class), props } |
| } |
| |
| <span class="doccomment">/// Creates a literal HIR expression. |
| /// |
| /// This accepts anything that can be converted into a `Box<[u8]>`. |
| /// |
| /// Note that there is no mechanism for storing a `char` or a `Box<str>` |
| /// in an HIR. Everything is "just bytes." Whether a `Literal` (or |
| /// any HIR node) matches valid UTF-8 exclusively can be queried via |
| /// [`Properties::is_utf8`]. |
| /// |
| /// # Example |
| /// |
| /// This example shows that concatenations of `Literal` HIR values will |
| /// automatically get flattened and combined together. So for example, even |
| /// if you concat multiple `Literal` values that are themselves not valid |
| /// UTF-8, they might add up to valid UTF-8. This also demonstrates just |
| /// how "smart" Hir's smart constructors are. |
| /// |
| /// ``` |
| /// use regex_syntax::hir::{Hir, HirKind, Literal}; |
| /// |
| /// let literals = vec![ |
| /// Hir::literal([0xE2]), |
| /// Hir::literal([0x98]), |
| /// Hir::literal([0x83]), |
| /// ]; |
| /// // Each literal, on its own, is invalid UTF-8. |
| /// assert!(literals.iter().all(|hir| !hir.properties().is_utf8())); |
| /// |
| /// let concat = Hir::concat(literals); |
| /// // But the concatenation is valid UTF-8! |
| /// assert!(concat.properties().is_utf8()); |
| /// |
| /// // And also notice that the literals have been concatenated into a |
| /// // single `Literal`, to the point where there is no explicit `Concat`! |
| /// let expected = HirKind::Literal(Literal(Box::from("☃".as_bytes()))); |
| /// assert_eq!(&expected, concat.kind()); |
| /// ``` |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>literal<B: Into<Box<[u8]>>>(lit: B) -> Hir { |
| <span class="kw">let </span>bytes = lit.into(); |
| <span class="kw">if </span>bytes.is_empty() { |
| <span class="kw">return </span>Hir::empty(); |
| } |
| |
| <span class="kw">let </span>lit = Literal(bytes); |
| <span class="kw">let </span>props = Properties::literal(<span class="kw-2">&</span>lit); |
| Hir { kind: HirKind::Literal(lit), props } |
| } |
| |
| <span class="doccomment">/// Creates a class HIR expression. The class may either be defined over |
| /// ranges of Unicode codepoints or ranges of raw byte values. |
| /// |
| /// Note that an empty class is permitted. An empty class is equivalent to |
| /// `Hir::fail()`. |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>class(class: Class) -> Hir { |
| <span class="kw">if </span>class.is_empty() { |
| <span class="kw">return </span>Hir::fail(); |
| } <span class="kw">else if let </span><span class="prelude-val">Some</span>(bytes) = class.literal() { |
| <span class="kw">return </span>Hir::literal(bytes); |
| } |
| <span class="kw">let </span>props = Properties::class(<span class="kw-2">&</span>class); |
| Hir { kind: HirKind::Class(class), props } |
| } |
| |
| <span class="doccomment">/// Creates a look-around assertion HIR expression. |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>look(look: Look) -> Hir { |
| <span class="kw">let </span>props = Properties::look(look); |
| Hir { kind: HirKind::Look(look), props } |
| } |
| |
| <span class="doccomment">/// Creates a repetition HIR expression. |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>repetition(rep: Repetition) -> Hir { |
| <span class="comment">// The regex 'a{0}' is always equivalent to the empty regex. This is |
| // true even when 'a' is an expression that never matches anything |
| // (like '\P{any}'). |
| // |
| // Additionally, the regex 'a{1}' is always equivalent to 'a'. |
| </span><span class="kw">if </span>rep.min == <span class="number">0 </span>&& rep.max == <span class="prelude-val">Some</span>(<span class="number">0</span>) { |
| <span class="kw">return </span>Hir::empty(); |
| } <span class="kw">else if </span>rep.min == <span class="number">1 </span>&& rep.max == <span class="prelude-val">Some</span>(<span class="number">1</span>) { |
| <span class="kw">return </span><span class="kw-2">*</span>rep.sub; |
| } |
| <span class="kw">let </span>props = Properties::repetition(<span class="kw-2">&</span>rep); |
| Hir { kind: HirKind::Repetition(rep), props } |
| } |
| |
| <span class="doccomment">/// Creates a capture HIR expression. |
| /// |
| /// Note that there is no explicit HIR value for a non-capturing group. |
| /// Since a non-capturing group only exists to override precedence in the |
| /// concrete syntax and since an HIR already does its own grouping based on |
| /// what is parsed, there is no need to explicitly represent non-capturing |
| /// groups in the HIR. |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>capture(capture: Capture) -> Hir { |
| <span class="kw">let </span>props = Properties::capture(<span class="kw-2">&</span>capture); |
| Hir { kind: HirKind::Capture(capture), props } |
| } |
| |
| <span class="doccomment">/// Returns the concatenation of the given expressions. |
| /// |
| /// This attempts to flatten and simplify the concatenation as appropriate. |
| /// |
| /// # Example |
| /// |
| /// This shows a simple example of basic flattening of both concatenations |
| /// and literals. |
| /// |
| /// ``` |
| /// use regex_syntax::hir::Hir; |
| /// |
| /// let hir = Hir::concat(vec![ |
| /// Hir::concat(vec![ |
| /// Hir::literal([b'a']), |
| /// Hir::literal([b'b']), |
| /// Hir::literal([b'c']), |
| /// ]), |
| /// Hir::concat(vec![ |
| /// Hir::literal([b'x']), |
| /// Hir::literal([b'y']), |
| /// Hir::literal([b'z']), |
| /// ]), |
| /// ]); |
| /// let expected = Hir::literal("abcxyz".as_bytes()); |
| /// assert_eq!(expected, hir); |
| /// ``` |
| </span><span class="kw">pub fn </span>concat(subs: Vec<Hir>) -> Hir { |
| <span class="comment">// We rebuild the concatenation by simplifying it. Would be nice to do |
| // it in place, but that seems a little tricky? |
| </span><span class="kw">let </span><span class="kw-2">mut </span>new = <span class="macro">vec!</span>[]; |
| <span class="comment">// This gobbles up any adjacent literals in a concatenation and smushes |
| // them together. Basically, when we see a literal, we add its bytes |
| // to 'prior_lit', and whenever we see anything else, we first take |
| // any bytes in 'prior_lit' and add it to the 'new' concatenation. |
| </span><span class="kw">let </span><span class="kw-2">mut </span>prior_lit: <span class="prelude-ty">Option</span><Vec<u8>> = <span class="prelude-val">None</span>; |
| <span class="kw">for </span>sub <span class="kw">in </span>subs { |
| <span class="kw">let </span>(kind, props) = sub.into_parts(); |
| <span class="kw">match </span>kind { |
| HirKind::Literal(Literal(bytes)) => { |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(<span class="kw-2">ref mut </span>prior_bytes) = prior_lit { |
| prior_bytes.extend_from_slice(<span class="kw-2">&</span>bytes); |
| } <span class="kw">else </span>{ |
| prior_lit = <span class="prelude-val">Some</span>(bytes.to_vec()); |
| } |
| } |
| <span class="comment">// We also flatten concats that are direct children of another |
| // concat. We only need to do this one level deep since |
| // Hir::concat is the only way to build concatenations, and so |
| // flattening happens inductively. |
| </span>HirKind::Concat(subs2) => { |
| <span class="kw">for </span>sub2 <span class="kw">in </span>subs2 { |
| <span class="kw">let </span>(kind2, props2) = sub2.into_parts(); |
| <span class="kw">match </span>kind2 { |
| HirKind::Literal(Literal(bytes)) => { |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(<span class="kw-2">ref mut </span>prior_bytes) = prior_lit { |
| prior_bytes.extend_from_slice(<span class="kw-2">&</span>bytes); |
| } <span class="kw">else </span>{ |
| prior_lit = <span class="prelude-val">Some</span>(bytes.to_vec()); |
| } |
| } |
| kind2 => { |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(prior_bytes) = prior_lit.take() { |
| new.push(Hir::literal(prior_bytes)); |
| } |
| new.push(Hir { kind: kind2, props: props2 }); |
| } |
| } |
| } |
| } |
| <span class="comment">// We can just skip empty HIRs. |
| </span>HirKind::Empty => {} |
| kind => { |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(prior_bytes) = prior_lit.take() { |
| new.push(Hir::literal(prior_bytes)); |
| } |
| new.push(Hir { kind, props }); |
| } |
| } |
| } |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(prior_bytes) = prior_lit.take() { |
| new.push(Hir::literal(prior_bytes)); |
| } |
| <span class="kw">if </span>new.is_empty() { |
| <span class="kw">return </span>Hir::empty(); |
| } <span class="kw">else if </span>new.len() == <span class="number">1 </span>{ |
| <span class="kw">return </span>new.pop().unwrap(); |
| } |
| <span class="kw">let </span>props = Properties::concat(<span class="kw-2">&</span>new); |
| Hir { kind: HirKind::Concat(new), props } |
| } |
| |
| <span class="doccomment">/// Returns the alternation of the given expressions. |
| /// |
| /// This flattens and simplifies the alternation as appropriate. This may |
| /// include factoring out common prefixes or even rewriting the alternation |
| /// as a character class. |
| /// |
| /// Note that an empty alternation is equivalent to `Hir::fail()`. (It |
| /// is not possible for one to write an empty alternation, or even an |
| /// alternation with a single sub-expression, in the concrete syntax of a |
| /// regex.) |
| /// |
| /// # Example |
| /// |
| /// This is a simple example showing how an alternation might get |
| /// simplified. |
| /// |
| /// ``` |
| /// use regex_syntax::hir::{Hir, Class, ClassUnicode, ClassUnicodeRange}; |
| /// |
| /// let hir = Hir::alternation(vec![ |
| /// Hir::literal([b'a']), |
| /// Hir::literal([b'b']), |
| /// Hir::literal([b'c']), |
| /// Hir::literal([b'd']), |
| /// Hir::literal([b'e']), |
| /// Hir::literal([b'f']), |
| /// ]); |
| /// let expected = Hir::class(Class::Unicode(ClassUnicode::new([ |
| /// ClassUnicodeRange::new('a', 'f'), |
| /// ]))); |
| /// assert_eq!(expected, hir); |
| /// ``` |
| /// |
| /// And another example showing how common prefixes might get factored |
| /// out. |
| /// |
| /// ``` |
| /// use regex_syntax::hir::{Hir, Class, ClassUnicode, ClassUnicodeRange}; |
| /// |
| /// let hir = Hir::alternation(vec![ |
| /// Hir::concat(vec![ |
| /// Hir::literal("abc".as_bytes()), |
| /// Hir::class(Class::Unicode(ClassUnicode::new([ |
| /// ClassUnicodeRange::new('A', 'Z'), |
| /// ]))), |
| /// ]), |
| /// Hir::concat(vec![ |
| /// Hir::literal("abc".as_bytes()), |
| /// Hir::class(Class::Unicode(ClassUnicode::new([ |
| /// ClassUnicodeRange::new('a', 'z'), |
| /// ]))), |
| /// ]), |
| /// ]); |
| /// let expected = Hir::concat(vec![ |
| /// Hir::literal("abc".as_bytes()), |
| /// Hir::alternation(vec![ |
| /// Hir::class(Class::Unicode(ClassUnicode::new([ |
| /// ClassUnicodeRange::new('A', 'Z'), |
| /// ]))), |
| /// Hir::class(Class::Unicode(ClassUnicode::new([ |
| /// ClassUnicodeRange::new('a', 'z'), |
| /// ]))), |
| /// ]), |
| /// ]); |
| /// assert_eq!(expected, hir); |
| /// ``` |
| /// |
| /// Note that these sorts of simplifications are not guaranteed. |
| </span><span class="kw">pub fn </span>alternation(subs: Vec<Hir>) -> Hir { |
| <span class="comment">// We rebuild the alternation by simplifying it. We proceed similarly |
| // as the concatenation case. But in this case, there's no literal |
| // simplification happening. We're just flattening alternations. |
| </span><span class="kw">let </span><span class="kw-2">mut </span>new = <span class="macro">vec!</span>[]; |
| <span class="kw">for </span>sub <span class="kw">in </span>subs { |
| <span class="kw">let </span>(kind, props) = sub.into_parts(); |
| <span class="kw">match </span>kind { |
| HirKind::Alternation(subs2) => { |
| new.extend(subs2); |
| } |
| kind => { |
| new.push(Hir { kind, props }); |
| } |
| } |
| } |
| <span class="kw">if </span>new.is_empty() { |
| <span class="kw">return </span>Hir::fail(); |
| } <span class="kw">else if </span>new.len() == <span class="number">1 </span>{ |
| <span class="kw">return </span>new.pop().unwrap(); |
| } |
| <span class="comment">// Now that it's completely flattened, look for the special case of |
| // 'char1|char2|...|charN' and collapse that into a class. Note that |
| // we look for 'char' first and then bytes. The issue here is that if |
| // we find both non-ASCII codepoints and non-ASCII singleton bytes, |
| // then it isn't actually possible to smush them into a single class. |
| // (Because classes are either "all codepoints" or "all bytes." You |
| // can have a class that both matches non-ASCII but valid UTF-8 and |
| // invalid UTF-8.) So we look for all chars and then all bytes, and |
| // don't handle anything else. |
| </span><span class="kw">if let </span><span class="prelude-val">Some</span>(singletons) = singleton_chars(<span class="kw-2">&</span>new) { |
| <span class="kw">let </span>it = singletons |
| .into_iter() |
| .map(|ch| ClassUnicodeRange { start: ch, end: ch }); |
| <span class="kw">return </span>Hir::class(Class::Unicode(ClassUnicode::new(it))); |
| } |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(singletons) = singleton_bytes(<span class="kw-2">&</span>new) { |
| <span class="kw">let </span>it = singletons |
| .into_iter() |
| .map(|b| ClassBytesRange { start: b, end: b }); |
| <span class="kw">return </span>Hir::class(Class::Bytes(ClassBytes::new(it))); |
| } |
| <span class="comment">// Similar to singleton chars, we can also look for alternations of |
| // classes. Those can be smushed into a single class. |
| </span><span class="kw">if let </span><span class="prelude-val">Some</span>(cls) = class_chars(<span class="kw-2">&</span>new) { |
| <span class="kw">return </span>Hir::class(cls); |
| } |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(cls) = class_bytes(<span class="kw-2">&</span>new) { |
| <span class="kw">return </span>Hir::class(cls); |
| } |
| <span class="comment">// Factor out a common prefix if we can, which might potentially |
| // simplify the expression and unlock other optimizations downstream. |
| // It also might generally make NFA matching and DFA construction |
| // faster by reducing the scope of branching in the regex. |
| </span>new = <span class="kw">match </span>lift_common_prefix(new) { |
| <span class="prelude-val">Ok</span>(hir) => <span class="kw">return </span>hir, |
| <span class="prelude-val">Err</span>(unchanged) => unchanged, |
| }; |
| <span class="kw">let </span>props = Properties::alternation(<span class="kw-2">&</span>new); |
| Hir { kind: HirKind::Alternation(new), props } |
| } |
| |
| <span class="doccomment">/// Returns an HIR expression for `.`. |
| /// |
| /// * [`Dot::AnyChar`] maps to `(?su-R:.)`. |
| /// * [`Dot::AnyByte`] maps to `(?s-Ru:.)`. |
| /// * [`Dot::AnyCharExceptLF`] maps to `(?u-Rs:.)`. |
| /// * [`Dot::AnyCharExceptCRLF`] maps to `(?Ru-s:.)`. |
| /// * [`Dot::AnyByteExceptLF`] maps to `(?-Rsu:.)`. |
| /// * [`Dot::AnyByteExceptCRLF`] maps to `(?R-su:.)`. |
| /// |
| /// # Example |
| /// |
| /// Note that this is a convenience routine for constructing the correct |
| /// character class based on the value of `Dot`. There is no explicit "dot" |
| /// HIR value. It is just an abbreviation for a common character class. |
| /// |
| /// ``` |
| /// use regex_syntax::hir::{Hir, Dot, Class, ClassBytes, ClassBytesRange}; |
| /// |
| /// let hir = Hir::dot(Dot::AnyByte); |
| /// let expected = Hir::class(Class::Bytes(ClassBytes::new([ |
| /// ClassBytesRange::new(0x00, 0xFF), |
| /// ]))); |
| /// assert_eq!(expected, hir); |
| /// ``` |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>dot(dot: Dot) -> Hir { |
| <span class="kw">match </span>dot { |
| Dot::AnyChar => { |
| <span class="kw">let </span><span class="kw-2">mut </span>cls = ClassUnicode::empty(); |
| cls.push(ClassUnicodeRange::new(<span class="string">'\0'</span>, <span class="string">'\u{10FFFF}'</span>)); |
| Hir::class(Class::Unicode(cls)) |
| } |
| Dot::AnyByte => { |
| <span class="kw">let </span><span class="kw-2">mut </span>cls = ClassBytes::empty(); |
| cls.push(ClassBytesRange::new(<span class="string">b'\0'</span>, <span class="string">b'\xFF'</span>)); |
| Hir::class(Class::Bytes(cls)) |
| } |
| Dot::AnyCharExceptLF => { |
| <span class="kw">let </span><span class="kw-2">mut </span>cls = ClassUnicode::empty(); |
| cls.push(ClassUnicodeRange::new(<span class="string">'\0'</span>, <span class="string">'\x09'</span>)); |
| cls.push(ClassUnicodeRange::new(<span class="string">'\x0B'</span>, <span class="string">'\u{10FFFF}'</span>)); |
| Hir::class(Class::Unicode(cls)) |
| } |
| Dot::AnyCharExceptCRLF => { |
| <span class="kw">let </span><span class="kw-2">mut </span>cls = ClassUnicode::empty(); |
| cls.push(ClassUnicodeRange::new(<span class="string">'\0'</span>, <span class="string">'\x09'</span>)); |
| cls.push(ClassUnicodeRange::new(<span class="string">'\x0B'</span>, <span class="string">'\x0C'</span>)); |
| cls.push(ClassUnicodeRange::new(<span class="string">'\x0E'</span>, <span class="string">'\u{10FFFF}'</span>)); |
| Hir::class(Class::Unicode(cls)) |
| } |
| Dot::AnyByteExceptLF => { |
| <span class="kw">let </span><span class="kw-2">mut </span>cls = ClassBytes::empty(); |
| cls.push(ClassBytesRange::new(<span class="string">b'\0'</span>, <span class="string">b'\x09'</span>)); |
| cls.push(ClassBytesRange::new(<span class="string">b'\x0B'</span>, <span class="string">b'\xFF'</span>)); |
| Hir::class(Class::Bytes(cls)) |
| } |
| Dot::AnyByteExceptCRLF => { |
| <span class="kw">let </span><span class="kw-2">mut </span>cls = ClassBytes::empty(); |
| cls.push(ClassBytesRange::new(<span class="string">b'\0'</span>, <span class="string">b'\x09'</span>)); |
| cls.push(ClassBytesRange::new(<span class="string">b'\x0B'</span>, <span class="string">b'\x0C'</span>)); |
| cls.push(ClassBytesRange::new(<span class="string">b'\x0E'</span>, <span class="string">b'\xFF'</span>)); |
| Hir::class(Class::Bytes(cls)) |
| } |
| } |
| } |
| } |
| |
| <span class="doccomment">/// The underlying kind of an arbitrary [`Hir`] expression. |
| /// |
| /// An `HirKind` is principally useful for doing case analysis on the type |
| /// of a regular expression. If you're looking to build new `Hir` values, |
| /// then you _must_ use the smart constructors defined on `Hir`, like |
| /// [`Hir::repetition`], to build new `Hir` values. The API intentionally does |
| /// not expose any way of building an `Hir` directly from an `HirKind`. |
| </span><span class="attribute">#[derive(Clone, Debug, Eq, PartialEq)] |
| </span><span class="kw">pub enum </span>HirKind { |
| <span class="doccomment">/// The empty regular expression, which matches everything, including the |
| /// empty string. |
| </span>Empty, |
| <span class="doccomment">/// A literalstring that matches exactly these bytes. |
| </span>Literal(Literal), |
| <span class="doccomment">/// A single character class that matches any of the characters in the |
| /// class. A class can either consist of Unicode scalar values as |
| /// characters, or it can use bytes. |
| /// |
| /// A class may be empty. In which case, it matches nothing. |
| </span>Class(Class), |
| <span class="doccomment">/// A look-around assertion. A look-around match always has zero length. |
| </span>Look(Look), |
| <span class="doccomment">/// A repetition operation applied to a sub-expression. |
| </span>Repetition(Repetition), |
| <span class="doccomment">/// A capturing group, which contains a sub-expression. |
| </span>Capture(Capture), |
| <span class="doccomment">/// A concatenation of expressions. |
| /// |
| /// A concatenation matches only if each of its sub-expressions match one |
| /// after the other. |
| /// |
| /// Concatenations are guaranteed by `Hir`'s smart constructors to always |
| /// have at least two sub-expressions. |
| </span>Concat(Vec<Hir>), |
| <span class="doccomment">/// An alternation of expressions. |
| /// |
| /// An alternation matches only if at least one of its sub-expressions |
| /// match. If multiple sub-expressions match, then the leftmost is |
| /// preferred. |
| /// |
| /// Alternations are guaranteed by `Hir`'s smart constructors to always |
| /// have at least two sub-expressions. |
| </span>Alternation(Vec<Hir>), |
| } |
| |
| <span class="kw">impl </span>HirKind { |
| <span class="doccomment">/// Returns a slice of this kind's sub-expressions, if any. |
| </span><span class="kw">pub fn </span>subs(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span>[Hir] { |
| <span class="kw">use </span>core::slice::from_ref; |
| |
| <span class="kw">match </span><span class="kw-2">*</span><span class="self">self </span>{ |
| HirKind::Empty |
| | HirKind::Literal(<span class="kw">_</span>) |
| | HirKind::Class(<span class="kw">_</span>) |
| | HirKind::Look(<span class="kw">_</span>) => <span class="kw-2">&</span>[], |
| HirKind::Repetition(Repetition { <span class="kw-2">ref </span>sub, .. }) => from_ref(sub), |
| HirKind::Capture(Capture { <span class="kw-2">ref </span>sub, .. }) => from_ref(sub), |
| HirKind::Concat(<span class="kw-2">ref </span>subs) => subs, |
| HirKind::Alternation(<span class="kw-2">ref </span>subs) => subs, |
| } |
| } |
| } |
| |
| <span class="kw">impl </span>core::fmt::Debug <span class="kw">for </span>Hir { |
| <span class="kw">fn </span>fmt(<span class="kw-2">&</span><span class="self">self</span>, f: <span class="kw-2">&mut </span>core::fmt::Formatter<<span class="lifetime">'_</span>>) -> core::fmt::Result { |
| <span class="self">self</span>.kind.fmt(f) |
| } |
| } |
| |
| <span class="doccomment">/// Print a display representation of this Hir. |
| /// |
| /// The result of this is a valid regular expression pattern string. |
| /// |
| /// This implementation uses constant stack space and heap space proportional |
| /// to the size of the `Hir`. |
| </span><span class="kw">impl </span>core::fmt::Display <span class="kw">for </span>Hir { |
| <span class="kw">fn </span>fmt(<span class="kw-2">&</span><span class="self">self</span>, f: <span class="kw-2">&mut </span>core::fmt::Formatter<<span class="lifetime">'_</span>>) -> core::fmt::Result { |
| <span class="kw">crate</span>::hir::print::Printer::new().print(<span class="self">self</span>, f) |
| } |
| } |
| |
| <span class="doccomment">/// The high-level intermediate representation of a literal. |
| /// |
| /// A literal corresponds to `0` or more bytes that should be matched |
| /// literally. The smart constructors defined on `Hir` will automatically |
| /// concatenate adjacent literals into one literal, and will even automatically |
| /// replace empty literals with `Hir::empty()`. |
| /// |
| /// Note that despite a literal being represented by a sequence of bytes, its |
| /// `Debug` implementation will attempt to print it as a normal string. (That |
| /// is, not a sequence of decimal numbers.) |
| </span><span class="attribute">#[derive(Clone, Eq, PartialEq)] |
| </span><span class="kw">pub struct </span>Literal(<span class="kw">pub </span>Box<[u8]>); |
| |
| <span class="kw">impl </span>core::fmt::Debug <span class="kw">for </span>Literal { |
| <span class="kw">fn </span>fmt(<span class="kw-2">&</span><span class="self">self</span>, f: <span class="kw-2">&mut </span>core::fmt::Formatter) -> core::fmt::Result { |
| <span class="kw">crate</span>::debug::Bytes(<span class="kw-2">&</span><span class="self">self</span>.<span class="number">0</span>).fmt(f) |
| } |
| } |
| |
| <span class="doccomment">/// The high-level intermediate representation of a character class. |
| /// |
| /// A character class corresponds to a set of characters. A character is either |
| /// defined by a Unicode scalar value or a byte. Unicode characters are used |
| /// by default, while bytes are used when Unicode mode (via the `u` flag) is |
| /// disabled. |
| /// |
| /// A character class, regardless of its character type, is represented by a |
| /// sequence of non-overlapping non-adjacent ranges of characters. |
| /// |
| /// Note that `Bytes` variant may be produced even when it exclusively matches |
| /// valid UTF-8. This is because a `Bytes` variant represents an intention by |
| /// the author of the regular expression to disable Unicode mode, which in turn |
| /// impacts the semantics of case insensitive matching. For example, `(?i)k` |
| /// and `(?i-u)k` will not match the same set of strings. |
| </span><span class="attribute">#[derive(Clone, Eq, PartialEq)] |
| </span><span class="kw">pub enum </span>Class { |
| <span class="doccomment">/// A set of characters represented by Unicode scalar values. |
| </span>Unicode(ClassUnicode), |
| <span class="doccomment">/// A set of characters represented by arbitrary bytes (one byte per |
| /// character). |
| </span>Bytes(ClassBytes), |
| } |
| |
| <span class="kw">impl </span>Class { |
| <span class="doccomment">/// Apply Unicode simple case folding to this character class, in place. |
| /// The character class will be expanded to include all simple case folded |
| /// character variants. |
| /// |
| /// If this is a byte oriented character class, then this will be limited |
| /// to the ASCII ranges `A-Z` and `a-z`. |
| /// |
| /// # Panics |
| /// |
| /// This routine panics when the case mapping data necessary for this |
| /// routine to complete is unavailable. This occurs when the `unicode-case` |
| /// feature is not enabled and the underlying class is Unicode oriented. |
| /// |
| /// Callers should prefer using `try_case_fold_simple` instead, which will |
| /// return an error instead of panicking. |
| </span><span class="kw">pub fn </span>case_fold_simple(<span class="kw-2">&mut </span><span class="self">self</span>) { |
| <span class="kw">match </span><span class="kw-2">*</span><span class="self">self </span>{ |
| Class::Unicode(<span class="kw-2">ref mut </span>x) => x.case_fold_simple(), |
| Class::Bytes(<span class="kw-2">ref mut </span>x) => x.case_fold_simple(), |
| } |
| } |
| |
| <span class="doccomment">/// Apply Unicode simple case folding to this character class, in place. |
| /// The character class will be expanded to include all simple case folded |
| /// character variants. |
| /// |
| /// If this is a byte oriented character class, then this will be limited |
| /// to the ASCII ranges `A-Z` and `a-z`. |
| /// |
| /// # Error |
| /// |
| /// This routine returns an error when the case mapping data necessary |
| /// for this routine to complete is unavailable. This occurs when the |
| /// `unicode-case` feature is not enabled and the underlying class is |
| /// Unicode oriented. |
| </span><span class="kw">pub fn </span>try_case_fold_simple( |
| <span class="kw-2">&mut </span><span class="self">self</span>, |
| ) -> core::result::Result<(), CaseFoldError> { |
| <span class="kw">match </span><span class="kw-2">*</span><span class="self">self </span>{ |
| Class::Unicode(<span class="kw-2">ref mut </span>x) => x.try_case_fold_simple()<span class="question-mark">?</span>, |
| Class::Bytes(<span class="kw-2">ref mut </span>x) => x.case_fold_simple(), |
| } |
| <span class="prelude-val">Ok</span>(()) |
| } |
| |
| <span class="doccomment">/// Negate this character class in place. |
| /// |
| /// After completion, this character class will contain precisely the |
| /// characters that weren't previously in the class. |
| </span><span class="kw">pub fn </span>negate(<span class="kw-2">&mut </span><span class="self">self</span>) { |
| <span class="kw">match </span><span class="kw-2">*</span><span class="self">self </span>{ |
| Class::Unicode(<span class="kw-2">ref mut </span>x) => x.negate(), |
| Class::Bytes(<span class="kw-2">ref mut </span>x) => x.negate(), |
| } |
| } |
| |
| <span class="doccomment">/// Returns true if and only if this character class will only ever match |
| /// valid UTF-8. |
| /// |
| /// A character class can match invalid UTF-8 only when the following |
| /// conditions are met: |
| /// |
| /// 1. The translator was configured to permit generating an expression |
| /// that can match invalid UTF-8. (By default, this is disabled.) |
| /// 2. Unicode mode (via the `u` flag) was disabled either in the concrete |
| /// syntax or in the parser builder. By default, Unicode mode is |
| /// enabled. |
| </span><span class="kw">pub fn </span>is_utf8(<span class="kw-2">&</span><span class="self">self</span>) -> bool { |
| <span class="kw">match </span><span class="kw-2">*</span><span class="self">self </span>{ |
| Class::Unicode(<span class="kw">_</span>) => <span class="bool-val">true</span>, |
| Class::Bytes(<span class="kw-2">ref </span>x) => x.is_ascii(), |
| } |
| } |
| |
| <span class="doccomment">/// Returns the length, in bytes, of the smallest string matched by this |
| /// character class. |
| /// |
| /// For non-empty byte oriented classes, this always returns `1`. For |
| /// non-empty Unicode oriented classes, this can return `1`, `2`, `3` or |
| /// `4`. For empty classes, `None` is returned. It is impossible for `0` to |
| /// be returned. |
| /// |
| /// # Example |
| /// |
| /// This example shows some examples of regexes and their corresponding |
| /// minimum length, if any. |
| /// |
| /// ``` |
| /// use regex_syntax::{hir::Properties, parse}; |
| /// |
| /// // The empty string has a min length of 0. |
| /// let hir = parse(r"")?; |
| /// assert_eq!(Some(0), hir.properties().minimum_len()); |
| /// // As do other types of regexes that only match the empty string. |
| /// let hir = parse(r"^$\b\B")?; |
| /// assert_eq!(Some(0), hir.properties().minimum_len()); |
| /// // A regex that can match the empty string but match more is still 0. |
| /// let hir = parse(r"a*")?; |
| /// assert_eq!(Some(0), hir.properties().minimum_len()); |
| /// // A regex that matches nothing has no minimum defined. |
| /// let hir = parse(r"[a&&b]")?; |
| /// assert_eq!(None, hir.properties().minimum_len()); |
| /// // Character classes usually have a minimum length of 1. |
| /// let hir = parse(r"\w")?; |
| /// assert_eq!(Some(1), hir.properties().minimum_len()); |
| /// // But sometimes Unicode classes might be bigger! |
| /// let hir = parse(r"\p{Cyrillic}")?; |
| /// assert_eq!(Some(2), hir.properties().minimum_len()); |
| /// |
| /// # Ok::<(), Box<dyn std::error::Error>>(()) |
| /// ``` |
| </span><span class="kw">pub fn </span>minimum_len(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><usize> { |
| <span class="kw">match </span><span class="kw-2">*</span><span class="self">self </span>{ |
| Class::Unicode(<span class="kw-2">ref </span>x) => x.minimum_len(), |
| Class::Bytes(<span class="kw-2">ref </span>x) => x.minimum_len(), |
| } |
| } |
| |
| <span class="doccomment">/// Returns the length, in bytes, of the longest string matched by this |
| /// character class. |
| /// |
| /// For non-empty byte oriented classes, this always returns `1`. For |
| /// non-empty Unicode oriented classes, this can return `1`, `2`, `3` or |
| /// `4`. For empty classes, `None` is returned. It is impossible for `0` to |
| /// be returned. |
| /// |
| /// # Example |
| /// |
| /// This example shows some examples of regexes and their corresponding |
| /// maximum length, if any. |
| /// |
| /// ``` |
| /// use regex_syntax::{hir::Properties, parse}; |
| /// |
| /// // The empty string has a max length of 0. |
| /// let hir = parse(r"")?; |
| /// assert_eq!(Some(0), hir.properties().maximum_len()); |
| /// // As do other types of regexes that only match the empty string. |
| /// let hir = parse(r"^$\b\B")?; |
| /// assert_eq!(Some(0), hir.properties().maximum_len()); |
| /// // A regex that matches nothing has no maximum defined. |
| /// let hir = parse(r"[a&&b]")?; |
| /// assert_eq!(None, hir.properties().maximum_len()); |
| /// // Bounded repeats work as you expect. |
| /// let hir = parse(r"x{2,10}")?; |
| /// assert_eq!(Some(10), hir.properties().maximum_len()); |
| /// // An unbounded repeat means there is no maximum. |
| /// let hir = parse(r"x{2,}")?; |
| /// assert_eq!(None, hir.properties().maximum_len()); |
| /// // With Unicode enabled, \w can match up to 4 bytes! |
| /// let hir = parse(r"\w")?; |
| /// assert_eq!(Some(4), hir.properties().maximum_len()); |
| /// // Without Unicode enabled, \w matches at most 1 byte. |
| /// let hir = parse(r"(?-u)\w")?; |
| /// assert_eq!(Some(1), hir.properties().maximum_len()); |
| /// |
| /// # Ok::<(), Box<dyn std::error::Error>>(()) |
| /// ``` |
| </span><span class="kw">pub fn </span>maximum_len(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><usize> { |
| <span class="kw">match </span><span class="kw-2">*</span><span class="self">self </span>{ |
| Class::Unicode(<span class="kw-2">ref </span>x) => x.maximum_len(), |
| Class::Bytes(<span class="kw-2">ref </span>x) => x.maximum_len(), |
| } |
| } |
| |
| <span class="doccomment">/// Returns true if and only if this character class is empty. That is, |
| /// it has no elements. |
| /// |
| /// An empty character can never match anything, including an empty string. |
| </span><span class="kw">pub fn </span>is_empty(<span class="kw-2">&</span><span class="self">self</span>) -> bool { |
| <span class="kw">match </span><span class="kw-2">*</span><span class="self">self </span>{ |
| Class::Unicode(<span class="kw-2">ref </span>x) => x.ranges().is_empty(), |
| Class::Bytes(<span class="kw-2">ref </span>x) => x.ranges().is_empty(), |
| } |
| } |
| |
| <span class="doccomment">/// If this class consists of exactly one element (whether a codepoint or a |
| /// byte), then return it as a literal byte string. |
| /// |
| /// If this class is empty or contains more than one element, then `None` |
| /// is returned. |
| </span><span class="kw">pub fn </span>literal(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><Vec<u8>> { |
| <span class="kw">match </span><span class="kw-2">*</span><span class="self">self </span>{ |
| Class::Unicode(<span class="kw-2">ref </span>x) => x.literal(), |
| Class::Bytes(<span class="kw-2">ref </span>x) => x.literal(), |
| } |
| } |
| } |
| |
| <span class="kw">impl </span>core::fmt::Debug <span class="kw">for </span>Class { |
| <span class="kw">fn </span>fmt(<span class="kw-2">&</span><span class="self">self</span>, f: <span class="kw-2">&mut </span>core::fmt::Formatter) -> core::fmt::Result { |
| <span class="kw">use </span><span class="kw">crate</span>::debug::Byte; |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>fmter = f.debug_set(); |
| <span class="kw">match </span><span class="kw-2">*</span><span class="self">self </span>{ |
| Class::Unicode(<span class="kw-2">ref </span>cls) => { |
| <span class="kw">for </span>r <span class="kw">in </span>cls.ranges().iter() { |
| fmter.entry(<span class="kw-2">&</span>(r.start..=r.end)); |
| } |
| } |
| Class::Bytes(<span class="kw-2">ref </span>cls) => { |
| <span class="kw">for </span>r <span class="kw">in </span>cls.ranges().iter() { |
| fmter.entry(<span class="kw-2">&</span>(Byte(r.start)..=Byte(r.end))); |
| } |
| } |
| } |
| fmter.finish() |
| } |
| } |
| |
| <span class="doccomment">/// A set of characters represented by Unicode scalar values. |
| </span><span class="attribute">#[derive(Clone, Debug, Eq, PartialEq)] |
| </span><span class="kw">pub struct </span>ClassUnicode { |
| set: IntervalSet<ClassUnicodeRange>, |
| } |
| |
| <span class="kw">impl </span>ClassUnicode { |
| <span class="doccomment">/// Create a new class from a sequence of ranges. |
| /// |
| /// The given ranges do not need to be in any specific order, and ranges |
| /// may overlap. Ranges will automatically be sorted into a canonical |
| /// non-overlapping order. |
| </span><span class="kw">pub fn </span>new<I>(ranges: I) -> ClassUnicode |
| <span class="kw">where |
| </span>I: IntoIterator<Item = ClassUnicodeRange>, |
| { |
| ClassUnicode { set: IntervalSet::new(ranges) } |
| } |
| |
| <span class="doccomment">/// Create a new class with no ranges. |
| /// |
| /// An empty class matches nothing. That is, it is equivalent to |
| /// [`Hir::fail`]. |
| </span><span class="kw">pub fn </span>empty() -> ClassUnicode { |
| ClassUnicode::new(<span class="macro">vec!</span>[]) |
| } |
| |
| <span class="doccomment">/// Add a new range to this set. |
| </span><span class="kw">pub fn </span>push(<span class="kw-2">&mut </span><span class="self">self</span>, range: ClassUnicodeRange) { |
| <span class="self">self</span>.set.push(range); |
| } |
| |
| <span class="doccomment">/// Return an iterator over all ranges in this class. |
| /// |
| /// The iterator yields ranges in ascending order. |
| </span><span class="kw">pub fn </span>iter(<span class="kw-2">&</span><span class="self">self</span>) -> ClassUnicodeIter<<span class="lifetime">'_</span>> { |
| ClassUnicodeIter(<span class="self">self</span>.set.iter()) |
| } |
| |
| <span class="doccomment">/// Return the underlying ranges as a slice. |
| </span><span class="kw">pub fn </span>ranges(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span>[ClassUnicodeRange] { |
| <span class="self">self</span>.set.intervals() |
| } |
| |
| <span class="doccomment">/// Expand this character class such that it contains all case folded |
| /// characters, according to Unicode's "simple" mapping. For example, if |
| /// this class consists of the range `a-z`, then applying case folding will |
| /// result in the class containing both the ranges `a-z` and `A-Z`. |
| /// |
| /// # Panics |
| /// |
| /// This routine panics when the case mapping data necessary for this |
| /// routine to complete is unavailable. This occurs when the `unicode-case` |
| /// feature is not enabled. |
| /// |
| /// Callers should prefer using `try_case_fold_simple` instead, which will |
| /// return an error instead of panicking. |
| </span><span class="kw">pub fn </span>case_fold_simple(<span class="kw-2">&mut </span><span class="self">self</span>) { |
| <span class="self">self</span>.set |
| .case_fold_simple() |
| .expect(<span class="string">"unicode-case feature must be enabled"</span>); |
| } |
| |
| <span class="doccomment">/// Expand this character class such that it contains all case folded |
| /// characters, according to Unicode's "simple" mapping. For example, if |
| /// this class consists of the range `a-z`, then applying case folding will |
| /// result in the class containing both the ranges `a-z` and `A-Z`. |
| /// |
| /// # Error |
| /// |
| /// This routine returns an error when the case mapping data necessary |
| /// for this routine to complete is unavailable. This occurs when the |
| /// `unicode-case` feature is not enabled. |
| </span><span class="kw">pub fn </span>try_case_fold_simple( |
| <span class="kw-2">&mut </span><span class="self">self</span>, |
| ) -> core::result::Result<(), CaseFoldError> { |
| <span class="self">self</span>.set.case_fold_simple() |
| } |
| |
| <span class="doccomment">/// Negate this character class. |
| /// |
| /// For all `c` where `c` is a Unicode scalar value, if `c` was in this |
| /// set, then it will not be in this set after negation. |
| </span><span class="kw">pub fn </span>negate(<span class="kw-2">&mut </span><span class="self">self</span>) { |
| <span class="self">self</span>.set.negate(); |
| } |
| |
| <span class="doccomment">/// Union this character class with the given character class, in place. |
| </span><span class="kw">pub fn </span>union(<span class="kw-2">&mut </span><span class="self">self</span>, other: <span class="kw-2">&</span>ClassUnicode) { |
| <span class="self">self</span>.set.union(<span class="kw-2">&</span>other.set); |
| } |
| |
| <span class="doccomment">/// Intersect this character class with the given character class, in |
| /// place. |
| </span><span class="kw">pub fn </span>intersect(<span class="kw-2">&mut </span><span class="self">self</span>, other: <span class="kw-2">&</span>ClassUnicode) { |
| <span class="self">self</span>.set.intersect(<span class="kw-2">&</span>other.set); |
| } |
| |
| <span class="doccomment">/// Subtract the given character class from this character class, in place. |
| </span><span class="kw">pub fn </span>difference(<span class="kw-2">&mut </span><span class="self">self</span>, other: <span class="kw-2">&</span>ClassUnicode) { |
| <span class="self">self</span>.set.difference(<span class="kw-2">&</span>other.set); |
| } |
| |
| <span class="doccomment">/// Compute the symmetric difference of the given character classes, in |
| /// place. |
| /// |
| /// This computes the symmetric difference of two character classes. This |
| /// removes all elements in this class that are also in the given class, |
| /// but all adds all elements from the given class that aren't in this |
| /// class. That is, the class will contain all elements in either class, |
| /// but will not contain any elements that are in both classes. |
| </span><span class="kw">pub fn </span>symmetric_difference(<span class="kw-2">&mut </span><span class="self">self</span>, other: <span class="kw-2">&</span>ClassUnicode) { |
| <span class="self">self</span>.set.symmetric_difference(<span class="kw-2">&</span>other.set); |
| } |
| |
| <span class="doccomment">/// Returns true if and only if this character class will either match |
| /// nothing or only ASCII bytes. Stated differently, this returns false |
| /// if and only if this class contains a non-ASCII codepoint. |
| </span><span class="kw">pub fn </span>is_ascii(<span class="kw-2">&</span><span class="self">self</span>) -> bool { |
| <span class="self">self</span>.set.intervals().last().map_or(<span class="bool-val">true</span>, |r| r.end <= <span class="string">'\x7F'</span>) |
| } |
| |
| <span class="doccomment">/// Returns the length, in bytes, of the smallest string matched by this |
| /// character class. |
| /// |
| /// Returns `None` when the class is empty. |
| </span><span class="kw">pub fn </span>minimum_len(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><usize> { |
| <span class="kw">let </span>first = <span class="self">self</span>.ranges().get(<span class="number">0</span>)<span class="question-mark">?</span>; |
| <span class="comment">// Correct because c1 < c2 implies c1.len_utf8() < c2.len_utf8(). |
| </span><span class="prelude-val">Some</span>(first.start.len_utf8()) |
| } |
| |
| <span class="doccomment">/// Returns the length, in bytes, of the longest string matched by this |
| /// character class. |
| /// |
| /// Returns `None` when the class is empty. |
| </span><span class="kw">pub fn </span>maximum_len(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><usize> { |
| <span class="kw">let </span>last = <span class="self">self</span>.ranges().last()<span class="question-mark">?</span>; |
| <span class="comment">// Correct because c1 < c2 implies c1.len_utf8() < c2.len_utf8(). |
| </span><span class="prelude-val">Some</span>(last.end.len_utf8()) |
| } |
| |
| <span class="doccomment">/// If this class consists of exactly one codepoint, then return it as |
| /// a literal byte string. |
| /// |
| /// If this class is empty or contains more than one codepoint, then `None` |
| /// is returned. |
| </span><span class="kw">pub fn </span>literal(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><Vec<u8>> { |
| <span class="kw">let </span>rs = <span class="self">self</span>.ranges(); |
| <span class="kw">if </span>rs.len() == <span class="number">1 </span>&& rs[<span class="number">0</span>].start == rs[<span class="number">0</span>].end { |
| <span class="prelude-val">Some</span>(rs[<span class="number">0</span>].start.encode_utf8(<span class="kw-2">&mut </span>[<span class="number">0</span>; <span class="number">4</span>]).to_string().into_bytes()) |
| } <span class="kw">else </span>{ |
| <span class="prelude-val">None |
| </span>} |
| } |
| |
| <span class="doccomment">/// If this class consists of only ASCII ranges, then return its |
| /// corresponding and equivalent byte class. |
| </span><span class="kw">pub fn </span>to_byte_class(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><ClassBytes> { |
| <span class="kw">if </span>!<span class="self">self</span>.is_ascii() { |
| <span class="kw">return </span><span class="prelude-val">None</span>; |
| } |
| <span class="prelude-val">Some</span>(ClassBytes::new(<span class="self">self</span>.ranges().iter().map(|r| { |
| <span class="comment">// Since we are guaranteed that our codepoint range is ASCII, the |
| // 'u8::try_from' calls below are guaranteed to be correct. |
| </span>ClassBytesRange { |
| start: u8::try_from(r.start).unwrap(), |
| end: u8::try_from(r.end).unwrap(), |
| } |
| }))) |
| } |
| } |
| |
| <span class="doccomment">/// An iterator over all ranges in a Unicode character class. |
| /// |
| /// The lifetime `'a` refers to the lifetime of the underlying class. |
| </span><span class="attribute">#[derive(Debug)] |
| </span><span class="kw">pub struct </span>ClassUnicodeIter<<span class="lifetime">'a</span>>(IntervalSetIter<<span class="lifetime">'a</span>, ClassUnicodeRange>); |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>> Iterator <span class="kw">for </span>ClassUnicodeIter<<span class="lifetime">'a</span>> { |
| <span class="kw">type </span>Item = <span class="kw-2">&</span><span class="lifetime">'a </span>ClassUnicodeRange; |
| |
| <span class="kw">fn </span>next(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><<span class="kw-2">&</span><span class="lifetime">'a </span>ClassUnicodeRange> { |
| <span class="self">self</span>.<span class="number">0</span>.next() |
| } |
| } |
| |
| <span class="doccomment">/// A single range of characters represented by Unicode scalar values. |
| /// |
| /// The range is closed. That is, the start and end of the range are included |
| /// in the range. |
| </span><span class="attribute">#[derive(Clone, Copy, Default, Eq, PartialEq, PartialOrd, Ord)] |
| </span><span class="kw">pub struct </span>ClassUnicodeRange { |
| start: char, |
| end: char, |
| } |
| |
| <span class="kw">impl </span>core::fmt::Debug <span class="kw">for </span>ClassUnicodeRange { |
| <span class="kw">fn </span>fmt(<span class="kw-2">&</span><span class="self">self</span>, f: <span class="kw-2">&mut </span>core::fmt::Formatter<<span class="lifetime">'_</span>>) -> core::fmt::Result { |
| <span class="kw">let </span>start = <span class="kw">if </span>!<span class="self">self</span>.start.is_whitespace() && !<span class="self">self</span>.start.is_control() |
| { |
| <span class="self">self</span>.start.to_string() |
| } <span class="kw">else </span>{ |
| <span class="macro">format!</span>(<span class="string">"0x{:X}"</span>, u32::from(<span class="self">self</span>.start)) |
| }; |
| <span class="kw">let </span>end = <span class="kw">if </span>!<span class="self">self</span>.end.is_whitespace() && !<span class="self">self</span>.end.is_control() { |
| <span class="self">self</span>.end.to_string() |
| } <span class="kw">else </span>{ |
| <span class="macro">format!</span>(<span class="string">"0x{:X}"</span>, u32::from(<span class="self">self</span>.end)) |
| }; |
| f.debug_struct(<span class="string">"ClassUnicodeRange"</span>) |
| .field(<span class="string">"start"</span>, <span class="kw-2">&</span>start) |
| .field(<span class="string">"end"</span>, <span class="kw-2">&</span>end) |
| .finish() |
| } |
| } |
| |
| <span class="kw">impl </span>Interval <span class="kw">for </span>ClassUnicodeRange { |
| <span class="kw">type </span>Bound = char; |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>lower(<span class="kw-2">&</span><span class="self">self</span>) -> char { |
| <span class="self">self</span>.start |
| } |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>upper(<span class="kw-2">&</span><span class="self">self</span>) -> char { |
| <span class="self">self</span>.end |
| } |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>set_lower(<span class="kw-2">&mut </span><span class="self">self</span>, bound: char) { |
| <span class="self">self</span>.start = bound; |
| } |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>set_upper(<span class="kw-2">&mut </span><span class="self">self</span>, bound: char) { |
| <span class="self">self</span>.end = bound; |
| } |
| |
| <span class="doccomment">/// Apply simple case folding to this Unicode scalar value range. |
| /// |
| /// Additional ranges are appended to the given vector. Canonical ordering |
| /// is *not* maintained in the given vector. |
| </span><span class="kw">fn </span>case_fold_simple( |
| <span class="kw-2">&</span><span class="self">self</span>, |
| ranges: <span class="kw-2">&mut </span>Vec<ClassUnicodeRange>, |
| ) -> <span class="prelude-ty">Result</span><(), unicode::CaseFoldError> { |
| <span class="kw">let </span><span class="kw-2">mut </span>folder = unicode::SimpleCaseFolder::new()<span class="question-mark">?</span>; |
| <span class="kw">if </span>!folder.overlaps(<span class="self">self</span>.start, <span class="self">self</span>.end) { |
| <span class="kw">return </span><span class="prelude-val">Ok</span>(()); |
| } |
| <span class="kw">let </span>(start, end) = (u32::from(<span class="self">self</span>.start), u32::from(<span class="self">self</span>.end)); |
| <span class="kw">for </span>cp <span class="kw">in </span>(start..=end).filter_map(char::from_u32) { |
| <span class="kw">for </span><span class="kw-2">&</span>cp_folded <span class="kw">in </span>folder.mapping(cp) { |
| ranges.push(ClassUnicodeRange::new(cp_folded, cp_folded)); |
| } |
| } |
| <span class="prelude-val">Ok</span>(()) |
| } |
| } |
| |
| <span class="kw">impl </span>ClassUnicodeRange { |
| <span class="doccomment">/// Create a new Unicode scalar value range for a character class. |
| /// |
| /// The returned range is always in a canonical form. That is, the range |
| /// returned always satisfies the invariant that `start <= end`. |
| </span><span class="kw">pub fn </span>new(start: char, end: char) -> ClassUnicodeRange { |
| ClassUnicodeRange::create(start, end) |
| } |
| |
| <span class="doccomment">/// Return the start of this range. |
| /// |
| /// The start of a range is always less than or equal to the end of the |
| /// range. |
| </span><span class="kw">pub fn </span>start(<span class="kw-2">&</span><span class="self">self</span>) -> char { |
| <span class="self">self</span>.start |
| } |
| |
| <span class="doccomment">/// Return the end of this range. |
| /// |
| /// The end of a range is always greater than or equal to the start of the |
| /// range. |
| </span><span class="kw">pub fn </span>end(<span class="kw-2">&</span><span class="self">self</span>) -> char { |
| <span class="self">self</span>.end |
| } |
| |
| <span class="doccomment">/// Returns the number of codepoints in this range. |
| </span><span class="kw">pub fn </span>len(<span class="kw-2">&</span><span class="self">self</span>) -> usize { |
| <span class="kw">let </span>diff = <span class="number">1 </span>+ u32::from(<span class="self">self</span>.end) - u32::from(<span class="self">self</span>.start); |
| <span class="comment">// This is likely to panic in 16-bit targets since a usize can only fit |
| // 2^16. It's not clear what to do here, other than to return an error |
| // when building a Unicode class that contains a range whose length |
| // overflows usize. (Which, to be honest, is probably quite common on |
| // 16-bit targets. For example, this would imply that '.' and '\p{any}' |
| // would be impossible to build.) |
| </span>usize::try_from(diff).expect(<span class="string">"char class len fits in usize"</span>) |
| } |
| } |
| |
| <span class="doccomment">/// A set of characters represented by arbitrary bytes (where one byte |
| /// corresponds to one character). |
| </span><span class="attribute">#[derive(Clone, Debug, Eq, PartialEq)] |
| </span><span class="kw">pub struct </span>ClassBytes { |
| set: IntervalSet<ClassBytesRange>, |
| } |
| |
| <span class="kw">impl </span>ClassBytes { |
| <span class="doccomment">/// Create a new class from a sequence of ranges. |
| /// |
| /// The given ranges do not need to be in any specific order, and ranges |
| /// may overlap. Ranges will automatically be sorted into a canonical |
| /// non-overlapping order. |
| </span><span class="kw">pub fn </span>new<I>(ranges: I) -> ClassBytes |
| <span class="kw">where |
| </span>I: IntoIterator<Item = ClassBytesRange>, |
| { |
| ClassBytes { set: IntervalSet::new(ranges) } |
| } |
| |
| <span class="doccomment">/// Create a new class with no ranges. |
| /// |
| /// An empty class matches nothing. That is, it is equivalent to |
| /// [`Hir::fail`]. |
| </span><span class="kw">pub fn </span>empty() -> ClassBytes { |
| ClassBytes::new(<span class="macro">vec!</span>[]) |
| } |
| |
| <span class="doccomment">/// Add a new range to this set. |
| </span><span class="kw">pub fn </span>push(<span class="kw-2">&mut </span><span class="self">self</span>, range: ClassBytesRange) { |
| <span class="self">self</span>.set.push(range); |
| } |
| |
| <span class="doccomment">/// Return an iterator over all ranges in this class. |
| /// |
| /// The iterator yields ranges in ascending order. |
| </span><span class="kw">pub fn </span>iter(<span class="kw-2">&</span><span class="self">self</span>) -> ClassBytesIter<<span class="lifetime">'_</span>> { |
| ClassBytesIter(<span class="self">self</span>.set.iter()) |
| } |
| |
| <span class="doccomment">/// Return the underlying ranges as a slice. |
| </span><span class="kw">pub fn </span>ranges(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span>[ClassBytesRange] { |
| <span class="self">self</span>.set.intervals() |
| } |
| |
| <span class="doccomment">/// Expand this character class such that it contains all case folded |
| /// characters. For example, if this class consists of the range `a-z`, |
| /// then applying case folding will result in the class containing both the |
| /// ranges `a-z` and `A-Z`. |
| /// |
| /// Note that this only applies ASCII case folding, which is limited to the |
| /// characters `a-z` and `A-Z`. |
| </span><span class="kw">pub fn </span>case_fold_simple(<span class="kw-2">&mut </span><span class="self">self</span>) { |
| <span class="self">self</span>.set.case_fold_simple().expect(<span class="string">"ASCII case folding never fails"</span>); |
| } |
| |
| <span class="doccomment">/// Negate this byte class. |
| /// |
| /// For all `b` where `b` is a any byte, if `b` was in this set, then it |
| /// will not be in this set after negation. |
| </span><span class="kw">pub fn </span>negate(<span class="kw-2">&mut </span><span class="self">self</span>) { |
| <span class="self">self</span>.set.negate(); |
| } |
| |
| <span class="doccomment">/// Union this byte class with the given byte class, in place. |
| </span><span class="kw">pub fn </span>union(<span class="kw-2">&mut </span><span class="self">self</span>, other: <span class="kw-2">&</span>ClassBytes) { |
| <span class="self">self</span>.set.union(<span class="kw-2">&</span>other.set); |
| } |
| |
| <span class="doccomment">/// Intersect this byte class with the given byte class, in place. |
| </span><span class="kw">pub fn </span>intersect(<span class="kw-2">&mut </span><span class="self">self</span>, other: <span class="kw-2">&</span>ClassBytes) { |
| <span class="self">self</span>.set.intersect(<span class="kw-2">&</span>other.set); |
| } |
| |
| <span class="doccomment">/// Subtract the given byte class from this byte class, in place. |
| </span><span class="kw">pub fn </span>difference(<span class="kw-2">&mut </span><span class="self">self</span>, other: <span class="kw-2">&</span>ClassBytes) { |
| <span class="self">self</span>.set.difference(<span class="kw-2">&</span>other.set); |
| } |
| |
| <span class="doccomment">/// Compute the symmetric difference of the given byte classes, in place. |
| /// |
| /// This computes the symmetric difference of two byte classes. This |
| /// removes all elements in this class that are also in the given class, |
| /// but all adds all elements from the given class that aren't in this |
| /// class. That is, the class will contain all elements in either class, |
| /// but will not contain any elements that are in both classes. |
| </span><span class="kw">pub fn </span>symmetric_difference(<span class="kw-2">&mut </span><span class="self">self</span>, other: <span class="kw-2">&</span>ClassBytes) { |
| <span class="self">self</span>.set.symmetric_difference(<span class="kw-2">&</span>other.set); |
| } |
| |
| <span class="doccomment">/// Returns true if and only if this character class will either match |
| /// nothing or only ASCII bytes. Stated differently, this returns false |
| /// if and only if this class contains a non-ASCII byte. |
| </span><span class="kw">pub fn </span>is_ascii(<span class="kw-2">&</span><span class="self">self</span>) -> bool { |
| <span class="self">self</span>.set.intervals().last().map_or(<span class="bool-val">true</span>, |r| r.end <= <span class="number">0x7F</span>) |
| } |
| |
| <span class="doccomment">/// Returns the length, in bytes, of the smallest string matched by this |
| /// character class. |
| /// |
| /// Returns `None` when the class is empty. |
| </span><span class="kw">pub fn </span>minimum_len(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><usize> { |
| <span class="kw">if </span><span class="self">self</span>.ranges().is_empty() { |
| <span class="prelude-val">None |
| </span>} <span class="kw">else </span>{ |
| <span class="prelude-val">Some</span>(<span class="number">1</span>) |
| } |
| } |
| |
| <span class="doccomment">/// Returns the length, in bytes, of the longest string matched by this |
| /// character class. |
| /// |
| /// Returns `None` when the class is empty. |
| </span><span class="kw">pub fn </span>maximum_len(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><usize> { |
| <span class="kw">if </span><span class="self">self</span>.ranges().is_empty() { |
| <span class="prelude-val">None |
| </span>} <span class="kw">else </span>{ |
| <span class="prelude-val">Some</span>(<span class="number">1</span>) |
| } |
| } |
| |
| <span class="doccomment">/// If this class consists of exactly one byte, then return it as |
| /// a literal byte string. |
| /// |
| /// If this class is empty or contains more than one byte, then `None` |
| /// is returned. |
| </span><span class="kw">pub fn </span>literal(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><Vec<u8>> { |
| <span class="kw">let </span>rs = <span class="self">self</span>.ranges(); |
| <span class="kw">if </span>rs.len() == <span class="number">1 </span>&& rs[<span class="number">0</span>].start == rs[<span class="number">0</span>].end { |
| <span class="prelude-val">Some</span>(<span class="macro">vec!</span>[rs[<span class="number">0</span>].start]) |
| } <span class="kw">else </span>{ |
| <span class="prelude-val">None |
| </span>} |
| } |
| |
| <span class="doccomment">/// If this class consists of only ASCII ranges, then return its |
| /// corresponding and equivalent Unicode class. |
| </span><span class="kw">pub fn </span>to_unicode_class(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><ClassUnicode> { |
| <span class="kw">if </span>!<span class="self">self</span>.is_ascii() { |
| <span class="kw">return </span><span class="prelude-val">None</span>; |
| } |
| <span class="prelude-val">Some</span>(ClassUnicode::new(<span class="self">self</span>.ranges().iter().map(|r| { |
| <span class="comment">// Since we are guaranteed that our byte range is ASCII, the |
| // 'char::from' calls below are correct and will not erroneously |
| // convert a raw byte value into its corresponding codepoint. |
| </span>ClassUnicodeRange { |
| start: char::from(r.start), |
| end: char::from(r.end), |
| } |
| }))) |
| } |
| } |
| |
| <span class="doccomment">/// An iterator over all ranges in a byte character class. |
| /// |
| /// The lifetime `'a` refers to the lifetime of the underlying class. |
| </span><span class="attribute">#[derive(Debug)] |
| </span><span class="kw">pub struct </span>ClassBytesIter<<span class="lifetime">'a</span>>(IntervalSetIter<<span class="lifetime">'a</span>, ClassBytesRange>); |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>> Iterator <span class="kw">for </span>ClassBytesIter<<span class="lifetime">'a</span>> { |
| <span class="kw">type </span>Item = <span class="kw-2">&</span><span class="lifetime">'a </span>ClassBytesRange; |
| |
| <span class="kw">fn </span>next(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><<span class="kw-2">&</span><span class="lifetime">'a </span>ClassBytesRange> { |
| <span class="self">self</span>.<span class="number">0</span>.next() |
| } |
| } |
| |
| <span class="doccomment">/// A single range of characters represented by arbitrary bytes. |
| /// |
| /// The range is closed. That is, the start and end of the range are included |
| /// in the range. |
| </span><span class="attribute">#[derive(Clone, Copy, Default, Eq, PartialEq, PartialOrd, Ord)] |
| </span><span class="kw">pub struct </span>ClassBytesRange { |
| start: u8, |
| end: u8, |
| } |
| |
| <span class="kw">impl </span>Interval <span class="kw">for </span>ClassBytesRange { |
| <span class="kw">type </span>Bound = u8; |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>lower(<span class="kw-2">&</span><span class="self">self</span>) -> u8 { |
| <span class="self">self</span>.start |
| } |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>upper(<span class="kw-2">&</span><span class="self">self</span>) -> u8 { |
| <span class="self">self</span>.end |
| } |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>set_lower(<span class="kw-2">&mut </span><span class="self">self</span>, bound: u8) { |
| <span class="self">self</span>.start = bound; |
| } |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>set_upper(<span class="kw-2">&mut </span><span class="self">self</span>, bound: u8) { |
| <span class="self">self</span>.end = bound; |
| } |
| |
| <span class="doccomment">/// Apply simple case folding to this byte range. Only ASCII case mappings |
| /// (for a-z) are applied. |
| /// |
| /// Additional ranges are appended to the given vector. Canonical ordering |
| /// is *not* maintained in the given vector. |
| </span><span class="kw">fn </span>case_fold_simple( |
| <span class="kw-2">&</span><span class="self">self</span>, |
| ranges: <span class="kw-2">&mut </span>Vec<ClassBytesRange>, |
| ) -> <span class="prelude-ty">Result</span><(), unicode::CaseFoldError> { |
| <span class="kw">if </span>!ClassBytesRange::new(<span class="string">b'a'</span>, <span class="string">b'z'</span>).is_intersection_empty(<span class="self">self</span>) { |
| <span class="kw">let </span>lower = cmp::max(<span class="self">self</span>.start, <span class="string">b'a'</span>); |
| <span class="kw">let </span>upper = cmp::min(<span class="self">self</span>.end, <span class="string">b'z'</span>); |
| ranges.push(ClassBytesRange::new(lower - <span class="number">32</span>, upper - <span class="number">32</span>)); |
| } |
| <span class="kw">if </span>!ClassBytesRange::new(<span class="string">b'A'</span>, <span class="string">b'Z'</span>).is_intersection_empty(<span class="self">self</span>) { |
| <span class="kw">let </span>lower = cmp::max(<span class="self">self</span>.start, <span class="string">b'A'</span>); |
| <span class="kw">let </span>upper = cmp::min(<span class="self">self</span>.end, <span class="string">b'Z'</span>); |
| ranges.push(ClassBytesRange::new(lower + <span class="number">32</span>, upper + <span class="number">32</span>)); |
| } |
| <span class="prelude-val">Ok</span>(()) |
| } |
| } |
| |
| <span class="kw">impl </span>ClassBytesRange { |
| <span class="doccomment">/// Create a new byte range for a character class. |
| /// |
| /// The returned range is always in a canonical form. That is, the range |
| /// returned always satisfies the invariant that `start <= end`. |
| </span><span class="kw">pub fn </span>new(start: u8, end: u8) -> ClassBytesRange { |
| ClassBytesRange::create(start, end) |
| } |
| |
| <span class="doccomment">/// Return the start of this range. |
| /// |
| /// The start of a range is always less than or equal to the end of the |
| /// range. |
| </span><span class="kw">pub fn </span>start(<span class="kw-2">&</span><span class="self">self</span>) -> u8 { |
| <span class="self">self</span>.start |
| } |
| |
| <span class="doccomment">/// Return the end of this range. |
| /// |
| /// The end of a range is always greater than or equal to the start of the |
| /// range. |
| </span><span class="kw">pub fn </span>end(<span class="kw-2">&</span><span class="self">self</span>) -> u8 { |
| <span class="self">self</span>.end |
| } |
| |
| <span class="doccomment">/// Returns the number of bytes in this range. |
| </span><span class="kw">pub fn </span>len(<span class="kw-2">&</span><span class="self">self</span>) -> usize { |
| usize::from(<span class="self">self</span>.end.checked_sub(<span class="self">self</span>.start).unwrap()) |
| .checked_add(<span class="number">1</span>) |
| .unwrap() |
| } |
| } |
| |
| <span class="kw">impl </span>core::fmt::Debug <span class="kw">for </span>ClassBytesRange { |
| <span class="kw">fn </span>fmt(<span class="kw-2">&</span><span class="self">self</span>, f: <span class="kw-2">&mut </span>core::fmt::Formatter<<span class="lifetime">'_</span>>) -> core::fmt::Result { |
| f.debug_struct(<span class="string">"ClassBytesRange"</span>) |
| .field(<span class="string">"start"</span>, <span class="kw-2">&</span><span class="kw">crate</span>::debug::Byte(<span class="self">self</span>.start)) |
| .field(<span class="string">"end"</span>, <span class="kw-2">&</span><span class="kw">crate</span>::debug::Byte(<span class="self">self</span>.end)) |
| .finish() |
| } |
| } |
| |
| <span class="doccomment">/// The high-level intermediate representation for a look-around assertion. |
| /// |
| /// An assertion match is always zero-length. Also called an "empty match." |
| </span><span class="attribute">#[derive(Clone, Copy, Debug, Eq, PartialEq)] |
| </span><span class="kw">pub enum </span>Look { |
| <span class="doccomment">/// Match the beginning of text. Specifically, this matches at the starting |
| /// position of the input. |
| </span>Start = <span class="number">1 </span><< <span class="number">0</span>, |
| <span class="doccomment">/// Match the end of text. Specifically, this matches at the ending |
| /// position of the input. |
| </span>End = <span class="number">1 </span><< <span class="number">1</span>, |
| <span class="doccomment">/// Match the beginning of a line or the beginning of text. Specifically, |
| /// this matches at the starting position of the input, or at the position |
| /// immediately following a `\n` character. |
| </span>StartLF = <span class="number">1 </span><< <span class="number">2</span>, |
| <span class="doccomment">/// Match the end of a line or the end of text. Specifically, this matches |
| /// at the end position of the input, or at the position immediately |
| /// preceding a `\n` character. |
| </span>EndLF = <span class="number">1 </span><< <span class="number">3</span>, |
| <span class="doccomment">/// Match the beginning of a line or the beginning of text. Specifically, |
| /// this matches at the starting position of the input, or at the position |
| /// immediately following either a `\r` or `\n` character, but never after |
| /// a `\r` when a `\n` follows. |
| </span>StartCRLF = <span class="number">1 </span><< <span class="number">4</span>, |
| <span class="doccomment">/// Match the end of a line or the end of text. Specifically, this matches |
| /// at the end position of the input, or at the position immediately |
| /// preceding a `\r` or `\n` character, but never before a `\n` when a `\r` |
| /// precedes it. |
| </span>EndCRLF = <span class="number">1 </span><< <span class="number">5</span>, |
| <span class="doccomment">/// Match an ASCII-only word boundary. That is, this matches a position |
| /// where the left adjacent character and right adjacent character |
| /// correspond to a word and non-word or a non-word and word character. |
| </span>WordAscii = <span class="number">1 </span><< <span class="number">6</span>, |
| <span class="doccomment">/// Match an ASCII-only negation of a word boundary. |
| </span>WordAsciiNegate = <span class="number">1 </span><< <span class="number">7</span>, |
| <span class="doccomment">/// Match a Unicode-aware word boundary. That is, this matches a position |
| /// where the left adjacent character and right adjacent character |
| /// correspond to a word and non-word or a non-word and word character. |
| </span>WordUnicode = <span class="number">1 </span><< <span class="number">8</span>, |
| <span class="doccomment">/// Match a Unicode-aware negation of a word boundary. |
| </span>WordUnicodeNegate = <span class="number">1 </span><< <span class="number">9</span>, |
| } |
| |
| <span class="kw">impl </span>Look { |
| <span class="doccomment">/// Flip the look-around assertion to its equivalent for reverse searches. |
| /// For example, `StartLF` gets translated to `EndLF`. |
| /// |
| /// Some assertions, such as `WordUnicode`, remain the same since they |
| /// match the same positions regardless of the direction of the search. |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">pub const fn </span>reversed(<span class="self">self</span>) -> Look { |
| <span class="kw">match </span><span class="self">self </span>{ |
| Look::Start => Look::End, |
| Look::End => Look::Start, |
| Look::StartLF => Look::EndLF, |
| Look::EndLF => Look::StartLF, |
| Look::StartCRLF => Look::EndCRLF, |
| Look::EndCRLF => Look::StartCRLF, |
| Look::WordAscii => Look::WordAscii, |
| Look::WordAsciiNegate => Look::WordAsciiNegate, |
| Look::WordUnicode => Look::WordUnicode, |
| Look::WordUnicodeNegate => Look::WordUnicodeNegate, |
| } |
| } |
| |
| <span class="doccomment">/// Return the underlying representation of this look-around enumeration |
| /// as an integer. Giving the return value to the [`Look::from_repr`] |
| /// constructor is guaranteed to return the same look-around variant that |
| /// one started with within a semver compatible release of this crate. |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">pub const fn </span>as_repr(<span class="self">self</span>) -> u16 { |
| <span class="comment">// AFAIK, 'as' is the only way to zero-cost convert an int enum to an |
| // actual int. |
| </span><span class="self">self </span><span class="kw">as </span>u16 |
| } |
| |
| <span class="doccomment">/// Given the underlying representation of a `Look` value, return the |
| /// corresponding `Look` value if the representation is valid. Otherwise |
| /// `None` is returned. |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">pub const fn </span>from_repr(repr: u16) -> <span class="prelude-ty">Option</span><Look> { |
| <span class="kw">match </span>repr { |
| <span class="number">0b00_0000_0001 </span>=> <span class="prelude-val">Some</span>(Look::Start), |
| <span class="number">0b00_0000_0010 </span>=> <span class="prelude-val">Some</span>(Look::End), |
| <span class="number">0b00_0000_0100 </span>=> <span class="prelude-val">Some</span>(Look::StartLF), |
| <span class="number">0b00_0000_1000 </span>=> <span class="prelude-val">Some</span>(Look::EndLF), |
| <span class="number">0b00_0001_0000 </span>=> <span class="prelude-val">Some</span>(Look::StartCRLF), |
| <span class="number">0b00_0010_0000 </span>=> <span class="prelude-val">Some</span>(Look::EndCRLF), |
| <span class="number">0b00_0100_0000 </span>=> <span class="prelude-val">Some</span>(Look::WordAscii), |
| <span class="number">0b00_1000_0000 </span>=> <span class="prelude-val">Some</span>(Look::WordAsciiNegate), |
| <span class="number">0b01_0000_0000 </span>=> <span class="prelude-val">Some</span>(Look::WordUnicode), |
| <span class="number">0b10_0000_0000 </span>=> <span class="prelude-val">Some</span>(Look::WordUnicodeNegate), |
| <span class="kw">_ </span>=> <span class="prelude-val">None</span>, |
| } |
| } |
| |
| <span class="doccomment">/// Returns a convenient single codepoint representation of this |
| /// look-around assertion. Each assertion is guaranteed to be represented |
| /// by a distinct character. |
| /// |
| /// This is useful for succinctly representing a look-around assertion in |
| /// human friendly but succinct output intended for a programmer working on |
| /// regex internals. |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">pub const fn </span>as_char(<span class="self">self</span>) -> char { |
| <span class="kw">match </span><span class="self">self </span>{ |
| Look::Start => <span class="string">'A'</span>, |
| Look::End => <span class="string">'z'</span>, |
| Look::StartLF => <span class="string">'^'</span>, |
| Look::EndLF => <span class="string">'$'</span>, |
| Look::StartCRLF => <span class="string">'r'</span>, |
| Look::EndCRLF => <span class="string">'R'</span>, |
| Look::WordAscii => <span class="string">'b'</span>, |
| Look::WordAsciiNegate => <span class="string">'B'</span>, |
| Look::WordUnicode => <span class="string">'𝛃'</span>, |
| Look::WordUnicodeNegate => <span class="string">'𝚩'</span>, |
| } |
| } |
| } |
| |
| <span class="doccomment">/// The high-level intermediate representation for a capturing group. |
| /// |
| /// A capturing group always has an index and a child expression. It may |
| /// also have a name associated with it (e.g., `(?P<foo>\w)`), but it's not |
| /// necessary. |
| /// |
| /// Note that there is no explicit representation of a non-capturing group |
| /// in a `Hir`. Instead, non-capturing grouping is handled automatically by |
| /// the recursive structure of the `Hir` itself. |
| </span><span class="attribute">#[derive(Clone, Debug, Eq, PartialEq)] |
| </span><span class="kw">pub struct </span>Capture { |
| <span class="doccomment">/// The capture index of the capture. |
| </span><span class="kw">pub </span>index: u32, |
| <span class="doccomment">/// The name of the capture, if it exists. |
| </span><span class="kw">pub </span>name: <span class="prelude-ty">Option</span><Box<str>>, |
| <span class="doccomment">/// The expression inside the capturing group, which may be empty. |
| </span><span class="kw">pub </span>sub: Box<Hir>, |
| } |
| |
| <span class="doccomment">/// The high-level intermediate representation of a repetition operator. |
| /// |
| /// A repetition operator permits the repetition of an arbitrary |
| /// sub-expression. |
| </span><span class="attribute">#[derive(Clone, Debug, Eq, PartialEq)] |
| </span><span class="kw">pub struct </span>Repetition { |
| <span class="doccomment">/// The minimum range of the repetition. |
| /// |
| /// Note that special cases like `?`, `+` and `*` all get translated into |
| /// the ranges `{0,1}`, `{1,}` and `{0,}`, respectively. |
| /// |
| /// When `min` is zero, this expression can match the empty string |
| /// regardless of what its sub-expression is. |
| </span><span class="kw">pub </span>min: u32, |
| <span class="doccomment">/// The maximum range of the repetition. |
| /// |
| /// Note that when `max` is `None`, `min` acts as a lower bound but where |
| /// there is no upper bound. For something like `x{5}` where the min and |
| /// max are equivalent, `min` will be set to `5` and `max` will be set to |
| /// `Some(5)`. |
| </span><span class="kw">pub </span>max: <span class="prelude-ty">Option</span><u32>, |
| <span class="doccomment">/// Whether this repetition operator is greedy or not. A greedy operator |
| /// will match as much as it can. A non-greedy operator will match as |
| /// little as it can. |
| /// |
| /// Typically, operators are greedy by default and are only non-greedy when |
| /// a `?` suffix is used, e.g., `(expr)*` is greedy while `(expr)*?` is |
| /// not. However, this can be inverted via the `U` "ungreedy" flag. |
| </span><span class="kw">pub </span>greedy: bool, |
| <span class="doccomment">/// The expression being repeated. |
| </span><span class="kw">pub </span>sub: Box<Hir>, |
| } |
| |
| <span class="kw">impl </span>Repetition { |
| <span class="doccomment">/// Returns a new repetition with the same `min`, `max` and `greedy` |
| /// values, but with its sub-expression replaced with the one given. |
| </span><span class="kw">pub fn </span>with(<span class="kw-2">&</span><span class="self">self</span>, sub: Hir) -> Repetition { |
| Repetition { |
| min: <span class="self">self</span>.min, |
| max: <span class="self">self</span>.max, |
| greedy: <span class="self">self</span>.greedy, |
| sub: Box::new(sub), |
| } |
| } |
| } |
| |
| <span class="doccomment">/// A type describing the different flavors of `.`. |
| /// |
| /// This type is meant to be used with [`Hir::dot`], which is a convenience |
| /// routine for building HIR values derived from the `.` regex. |
| </span><span class="attribute">#[non_exhaustive] |
| #[derive(Clone, Copy, Debug, Eq, PartialEq)] |
| </span><span class="kw">pub enum </span>Dot { |
| <span class="doccomment">/// Matches the UTF-8 encoding of any Unicode scalar value. |
| /// |
| /// This is equivalent to `(?su:.)` and also `\p{any}`. |
| </span>AnyChar, |
| <span class="doccomment">/// Matches any byte value. |
| /// |
| /// This is equivalent to `(?s-u:.)` and also `(?-u:[\x00-\xFF])`. |
| </span>AnyByte, |
| <span class="doccomment">/// Matches the UTF-8 encoding of any Unicode scalar value except for `\n`. |
| /// |
| /// This is equivalent to `(?u-s:.)` and also `[\p{any}--\n]`. |
| </span>AnyCharExceptLF, |
| <span class="doccomment">/// Matches the UTF-8 encoding of any Unicode scalar value except for `\r` |
| /// and `\n`. |
| /// |
| /// This is equivalent to `(?uR-s:.)` and also `[\p{any}--\r\n]`. |
| </span>AnyCharExceptCRLF, |
| <span class="doccomment">/// Matches any byte value except for `\n`. |
| /// |
| /// This is equivalent to `(?-su:.)` and also `(?-u:[[\x00-\xFF]--\n])`. |
| </span>AnyByteExceptLF, |
| <span class="doccomment">/// Matches any byte value except for `\r` and `\n`. |
| /// |
| /// This is equivalent to `(?R-su:.)` and also `(?-u:[[\x00-\xFF]--\r\n])`. |
| </span>AnyByteExceptCRLF, |
| } |
| |
| <span class="doccomment">/// A custom `Drop` impl is used for `HirKind` such that it uses constant stack |
| /// space but heap space proportional to the depth of the total `Hir`. |
| </span><span class="kw">impl </span>Drop <span class="kw">for </span>Hir { |
| <span class="kw">fn </span>drop(<span class="kw-2">&mut </span><span class="self">self</span>) { |
| <span class="kw">use </span>core::mem; |
| |
| <span class="kw">match </span><span class="kw-2">*</span><span class="self">self</span>.kind() { |
| HirKind::Empty |
| | HirKind::Literal(<span class="kw">_</span>) |
| | HirKind::Class(<span class="kw">_</span>) |
| | HirKind::Look(<span class="kw">_</span>) => <span class="kw">return</span>, |
| HirKind::Capture(<span class="kw-2">ref </span>x) <span class="kw">if </span>x.sub.kind.subs().is_empty() => <span class="kw">return</span>, |
| HirKind::Repetition(<span class="kw-2">ref </span>x) <span class="kw">if </span>x.sub.kind.subs().is_empty() => { |
| <span class="kw">return |
| </span>} |
| HirKind::Concat(<span class="kw-2">ref </span>x) <span class="kw">if </span>x.is_empty() => <span class="kw">return</span>, |
| HirKind::Alternation(<span class="kw-2">ref </span>x) <span class="kw">if </span>x.is_empty() => <span class="kw">return</span>, |
| <span class="kw">_ </span>=> {} |
| } |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>stack = <span class="macro">vec!</span>[mem::replace(<span class="self">self</span>, Hir::empty())]; |
| <span class="kw">while let </span><span class="prelude-val">Some</span>(<span class="kw-2">mut </span>expr) = stack.pop() { |
| <span class="kw">match </span>expr.kind { |
| HirKind::Empty |
| | HirKind::Literal(<span class="kw">_</span>) |
| | HirKind::Class(<span class="kw">_</span>) |
| | HirKind::Look(<span class="kw">_</span>) => {} |
| HirKind::Capture(<span class="kw-2">ref mut </span>x) => { |
| stack.push(mem::replace(<span class="kw-2">&mut </span>x.sub, Hir::empty())); |
| } |
| HirKind::Repetition(<span class="kw-2">ref mut </span>x) => { |
| stack.push(mem::replace(<span class="kw-2">&mut </span>x.sub, Hir::empty())); |
| } |
| HirKind::Concat(<span class="kw-2">ref mut </span>x) => { |
| stack.extend(x.drain(..)); |
| } |
| HirKind::Alternation(<span class="kw-2">ref mut </span>x) => { |
| stack.extend(x.drain(..)); |
| } |
| } |
| } |
| } |
| } |
| |
| <span class="doccomment">/// A type that collects various properties of an HIR value. |
| /// |
| /// Properties are always scalar values and represent meta data that is |
| /// computed inductively on an HIR value. Properties are defined for all |
| /// HIR values. |
| /// |
| /// All methods on a `Properties` value take constant time and are meant to |
| /// be cheap to call. |
| </span><span class="attribute">#[derive(Clone, Debug, Eq, PartialEq)] |
| </span><span class="kw">pub struct </span>Properties(Box<PropertiesI>); |
| |
| <span class="doccomment">/// The property definition. It is split out so that we can box it, and |
| /// there by make `Properties` use less stack size. This is kind-of important |
| /// because every HIR value has a `Properties` attached to it. |
| /// |
| /// This does have the unfortunate consequence that creating any HIR value |
| /// always leads to at least one alloc for properties, but this is generally |
| /// true anyway (for pretty much all HirKinds except for look-arounds). |
| </span><span class="attribute">#[derive(Clone, Debug, Eq, PartialEq)] |
| </span><span class="kw">struct </span>PropertiesI { |
| minimum_len: <span class="prelude-ty">Option</span><usize>, |
| maximum_len: <span class="prelude-ty">Option</span><usize>, |
| look_set: LookSet, |
| look_set_prefix: LookSet, |
| look_set_suffix: LookSet, |
| look_set_prefix_any: LookSet, |
| look_set_suffix_any: LookSet, |
| utf8: bool, |
| explicit_captures_len: usize, |
| static_explicit_captures_len: <span class="prelude-ty">Option</span><usize>, |
| literal: bool, |
| alternation_literal: bool, |
| } |
| |
| <span class="kw">impl </span>Properties { |
| <span class="doccomment">/// Returns the length (in bytes) of the smallest string matched by this |
| /// HIR. |
| /// |
| /// A return value of `0` is possible and occurs when the HIR can match an |
| /// empty string. |
| /// |
| /// `None` is returned when there is no minimum length. This occurs in |
| /// precisely the cases where the HIR matches nothing. i.e., The language |
| /// the regex matches is empty. An example of such a regex is `\P{any}`. |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>minimum_len(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><usize> { |
| <span class="self">self</span>.<span class="number">0</span>.minimum_len |
| } |
| |
| <span class="doccomment">/// Returns the length (in bytes) of the longest string matched by this |
| /// HIR. |
| /// |
| /// A return value of `0` is possible and occurs when nothing longer than |
| /// the empty string is in the language described by this HIR. |
| /// |
| /// `None` is returned when there is no longest matching string. This |
| /// occurs when the HIR matches nothing or when there is no upper bound on |
| /// the length of matching strings. Example of such regexes are `\P{any}` |
| /// (matches nothing) and `a+` (has no upper bound). |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>maximum_len(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><usize> { |
| <span class="self">self</span>.<span class="number">0</span>.maximum_len |
| } |
| |
| <span class="doccomment">/// Returns a set of all look-around assertions that appear at least once |
| /// in this HIR value. |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>look_set(<span class="kw-2">&</span><span class="self">self</span>) -> LookSet { |
| <span class="self">self</span>.<span class="number">0</span>.look_set |
| } |
| |
| <span class="doccomment">/// Returns a set of all look-around assertions that appear as a prefix for |
| /// this HIR value. That is, the set returned corresponds to the set of |
| /// assertions that must be passed before matching any bytes in a haystack. |
| /// |
| /// For example, `hir.look_set_prefix().contains(Look::Start)` returns true |
| /// if and only if the HIR is fully anchored at the start. |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>look_set_prefix(<span class="kw-2">&</span><span class="self">self</span>) -> LookSet { |
| <span class="self">self</span>.<span class="number">0</span>.look_set_prefix |
| } |
| |
| <span class="doccomment">/// Returns a set of all look-around assertions that appear as a _possible_ |
| /// prefix for this HIR value. That is, the set returned corresponds to the |
| /// set of assertions that _may_ be passed before matching any bytes in a |
| /// haystack. |
| /// |
| /// For example, `hir.look_set_prefix_any().contains(Look::Start)` returns |
| /// true if and only if it's possible for the regex to match through a |
| /// anchored assertion before consuming any input. |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>look_set_prefix_any(<span class="kw-2">&</span><span class="self">self</span>) -> LookSet { |
| <span class="self">self</span>.<span class="number">0</span>.look_set_prefix_any |
| } |
| |
| <span class="doccomment">/// Returns a set of all look-around assertions that appear as a suffix for |
| /// this HIR value. That is, the set returned corresponds to the set of |
| /// assertions that must be passed in order to be considered a match after |
| /// all other consuming HIR expressions. |
| /// |
| /// For example, `hir.look_set_suffix().contains(Look::End)` returns true |
| /// if and only if the HIR is fully anchored at the end. |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>look_set_suffix(<span class="kw-2">&</span><span class="self">self</span>) -> LookSet { |
| <span class="self">self</span>.<span class="number">0</span>.look_set_suffix |
| } |
| |
| <span class="doccomment">/// Returns a set of all look-around assertions that appear as a _possible_ |
| /// suffix for this HIR value. That is, the set returned corresponds to the |
| /// set of assertions that _may_ be passed before matching any bytes in a |
| /// haystack. |
| /// |
| /// For example, `hir.look_set_suffix_any().contains(Look::End)` returns |
| /// true if and only if it's possible for the regex to match through a |
| /// anchored assertion at the end of a match without consuming any input. |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>look_set_suffix_any(<span class="kw-2">&</span><span class="self">self</span>) -> LookSet { |
| <span class="self">self</span>.<span class="number">0</span>.look_set_suffix_any |
| } |
| |
| <span class="doccomment">/// Return true if and only if the corresponding HIR will always match |
| /// valid UTF-8. |
| /// |
| /// When this returns false, then it is possible for this HIR expression to |
| /// match invalid UTF-8, including by matching between the code units of |
| /// a single UTF-8 encoded codepoint. |
| /// |
| /// Note that this returns true even when the corresponding HIR can match |
| /// the empty string. Since an empty string can technically appear between |
| /// UTF-8 code units, it is possible for a match to be reported that splits |
| /// a codepoint which could in turn be considered matching invalid UTF-8. |
| /// However, it is generally assumed that such empty matches are handled |
| /// specially by the search routine if it is absolutely required that |
| /// matches not split a codepoint. |
| /// |
| /// # Example |
| /// |
| /// This code example shows the UTF-8 property of a variety of patterns. |
| /// |
| /// ``` |
| /// use regex_syntax::{ParserBuilder, parse}; |
| /// |
| /// // Examples of 'is_utf8() == true'. |
| /// assert!(parse(r"a")?.properties().is_utf8()); |
| /// assert!(parse(r"[^a]")?.properties().is_utf8()); |
| /// assert!(parse(r".")?.properties().is_utf8()); |
| /// assert!(parse(r"\W")?.properties().is_utf8()); |
| /// assert!(parse(r"\b")?.properties().is_utf8()); |
| /// assert!(parse(r"\B")?.properties().is_utf8()); |
| /// assert!(parse(r"(?-u)\b")?.properties().is_utf8()); |
| /// assert!(parse(r"(?-u)\B")?.properties().is_utf8()); |
| /// // Unicode mode is enabled by default, and in |
| /// // that mode, all \x hex escapes are treated as |
| /// // codepoints. So this actually matches the UTF-8 |
| /// // encoding of U+00FF. |
| /// assert!(parse(r"\xFF")?.properties().is_utf8()); |
| /// |
| /// // Now we show examples of 'is_utf8() == false'. |
| /// // The only way to do this is to force the parser |
| /// // to permit invalid UTF-8, otherwise all of these |
| /// // would fail to parse! |
| /// let parse = |pattern| { |
| /// ParserBuilder::new().utf8(false).build().parse(pattern) |
| /// }; |
| /// assert!(!parse(r"(?-u)[^a]")?.properties().is_utf8()); |
| /// assert!(!parse(r"(?-u).")?.properties().is_utf8()); |
| /// assert!(!parse(r"(?-u)\W")?.properties().is_utf8()); |
| /// // Conversely to the equivalent example above, |
| /// // when Unicode mode is disabled, \x hex escapes |
| /// // are treated as their raw byte values. |
| /// assert!(!parse(r"(?-u)\xFF")?.properties().is_utf8()); |
| /// // Note that just because we disabled UTF-8 in the |
| /// // parser doesn't mean we still can't use Unicode. |
| /// // It is enabled by default, so \xFF is still |
| /// // equivalent to matching the UTF-8 encoding of |
| /// // U+00FF by default. |
| /// assert!(parse(r"\xFF")?.properties().is_utf8()); |
| /// // Even though we use raw bytes that individually |
| /// // are not valid UTF-8, when combined together, the |
| /// // overall expression *does* match valid UTF-8! |
| /// assert!(parse(r"(?-u)\xE2\x98\x83")?.properties().is_utf8()); |
| /// |
| /// # Ok::<(), Box<dyn std::error::Error>>(()) |
| /// ``` |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>is_utf8(<span class="kw-2">&</span><span class="self">self</span>) -> bool { |
| <span class="self">self</span>.<span class="number">0</span>.utf8 |
| } |
| |
| <span class="doccomment">/// Returns the total number of explicit capturing groups in the |
| /// corresponding HIR. |
| /// |
| /// Note that this does not include the implicit capturing group |
| /// corresponding to the entire match that is typically included by regex |
| /// engines. |
| /// |
| /// # Example |
| /// |
| /// This method will return `0` for `a` and `1` for `(a)`: |
| /// |
| /// ``` |
| /// use regex_syntax::parse; |
| /// |
| /// assert_eq!(0, parse("a")?.properties().explicit_captures_len()); |
| /// assert_eq!(1, parse("(a)")?.properties().explicit_captures_len()); |
| /// |
| /// # Ok::<(), Box<dyn std::error::Error>>(()) |
| /// ``` |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>explicit_captures_len(<span class="kw-2">&</span><span class="self">self</span>) -> usize { |
| <span class="self">self</span>.<span class="number">0</span>.explicit_captures_len |
| } |
| |
| <span class="doccomment">/// Returns the total number of explicit capturing groups that appear in |
| /// every possible match. |
| /// |
| /// If the number of capture groups can vary depending on the match, then |
| /// this returns `None`. That is, a value is only returned when the number |
| /// of matching groups is invariant or "static." |
| /// |
| /// Note that this does not include the implicit capturing group |
| /// corresponding to the entire match. |
| /// |
| /// # Example |
| /// |
| /// This shows a few cases where a static number of capture groups is |
| /// available and a few cases where it is not. |
| /// |
| /// ``` |
| /// use regex_syntax::parse; |
| /// |
| /// let len = |pattern| { |
| /// parse(pattern).map(|h| { |
| /// h.properties().static_explicit_captures_len() |
| /// }) |
| /// }; |
| /// |
| /// assert_eq!(Some(0), len("a")?); |
| /// assert_eq!(Some(1), len("(a)")?); |
| /// assert_eq!(Some(1), len("(a)|(b)")?); |
| /// assert_eq!(Some(2), len("(a)(b)|(c)(d)")?); |
| /// assert_eq!(None, len("(a)|b")?); |
| /// assert_eq!(None, len("a|(b)")?); |
| /// assert_eq!(None, len("(b)*")?); |
| /// assert_eq!(Some(1), len("(b)+")?); |
| /// |
| /// # Ok::<(), Box<dyn std::error::Error>>(()) |
| /// ``` |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>static_explicit_captures_len(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><usize> { |
| <span class="self">self</span>.<span class="number">0</span>.static_explicit_captures_len |
| } |
| |
| <span class="doccomment">/// Return true if and only if this HIR is a simple literal. This is |
| /// only true when this HIR expression is either itself a `Literal` or a |
| /// concatenation of only `Literal`s. |
| /// |
| /// For example, `f` and `foo` are literals, but `f+`, `(foo)`, `foo()` and |
| /// the empty string are not (even though they contain sub-expressions that |
| /// are literals). |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>is_literal(<span class="kw-2">&</span><span class="self">self</span>) -> bool { |
| <span class="self">self</span>.<span class="number">0</span>.literal |
| } |
| |
| <span class="doccomment">/// Return true if and only if this HIR is either a simple literal or an |
| /// alternation of simple literals. This is only |
| /// true when this HIR expression is either itself a `Literal` or a |
| /// concatenation of only `Literal`s or an alternation of only `Literal`s. |
| /// |
| /// For example, `f`, `foo`, `a|b|c`, and `foo|bar|baz` are alternation |
| /// literals, but `f+`, `(foo)`, `foo()`, and the empty pattern are not |
| /// (even though that contain sub-expressions that are literals). |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>is_alternation_literal(<span class="kw-2">&</span><span class="self">self</span>) -> bool { |
| <span class="self">self</span>.<span class="number">0</span>.alternation_literal |
| } |
| |
| <span class="doccomment">/// Returns the total amount of heap memory usage, in bytes, used by this |
| /// `Properties` value. |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>memory_usage(<span class="kw-2">&</span><span class="self">self</span>) -> usize { |
| core::mem::size_of::<PropertiesI>() |
| } |
| |
| <span class="doccomment">/// Returns a new set of properties that corresponds to the union of the |
| /// iterator of properties given. |
| /// |
| /// This is useful when one has multiple `Hir` expressions and wants |
| /// to combine them into a single alternation without constructing the |
| /// corresponding `Hir`. This routine provides a way of combining the |
| /// properties of each `Hir` expression into one set of properties |
| /// representing the union of those expressions. |
| /// |
| /// # Example: union with HIRs that never match |
| /// |
| /// This example shows that unioning properties together with one that |
| /// represents a regex that never matches will "poison" certain attributes, |
| /// like the minimum and maximum lengths. |
| /// |
| /// ``` |
| /// use regex_syntax::{hir::Properties, parse}; |
| /// |
| /// let hir1 = parse("ab?c?")?; |
| /// assert_eq!(Some(1), hir1.properties().minimum_len()); |
| /// assert_eq!(Some(3), hir1.properties().maximum_len()); |
| /// |
| /// let hir2 = parse(r"[a&&b]")?; |
| /// assert_eq!(None, hir2.properties().minimum_len()); |
| /// assert_eq!(None, hir2.properties().maximum_len()); |
| /// |
| /// let hir3 = parse(r"wxy?z?")?; |
| /// assert_eq!(Some(2), hir3.properties().minimum_len()); |
| /// assert_eq!(Some(4), hir3.properties().maximum_len()); |
| /// |
| /// let unioned = Properties::union([ |
| /// hir1.properties(), |
| /// hir2.properties(), |
| /// hir3.properties(), |
| /// ]); |
| /// assert_eq!(None, unioned.minimum_len()); |
| /// assert_eq!(None, unioned.maximum_len()); |
| /// |
| /// # Ok::<(), Box<dyn std::error::Error>>(()) |
| /// ``` |
| /// |
| /// The maximum length can also be "poisoned" by a pattern that has no |
| /// upper bound on the length of a match. The minimum length remains |
| /// unaffected: |
| /// |
| /// ``` |
| /// use regex_syntax::{hir::Properties, parse}; |
| /// |
| /// let hir1 = parse("ab?c?")?; |
| /// assert_eq!(Some(1), hir1.properties().minimum_len()); |
| /// assert_eq!(Some(3), hir1.properties().maximum_len()); |
| /// |
| /// let hir2 = parse(r"a+")?; |
| /// assert_eq!(Some(1), hir2.properties().minimum_len()); |
| /// assert_eq!(None, hir2.properties().maximum_len()); |
| /// |
| /// let hir3 = parse(r"wxy?z?")?; |
| /// assert_eq!(Some(2), hir3.properties().minimum_len()); |
| /// assert_eq!(Some(4), hir3.properties().maximum_len()); |
| /// |
| /// let unioned = Properties::union([ |
| /// hir1.properties(), |
| /// hir2.properties(), |
| /// hir3.properties(), |
| /// ]); |
| /// assert_eq!(Some(1), unioned.minimum_len()); |
| /// assert_eq!(None, unioned.maximum_len()); |
| /// |
| /// # Ok::<(), Box<dyn std::error::Error>>(()) |
| /// ``` |
| </span><span class="kw">pub fn </span>union<I, P>(props: I) -> Properties |
| <span class="kw">where |
| </span>I: IntoIterator<Item = P>, |
| P: core::borrow::Borrow<Properties>, |
| { |
| <span class="kw">let </span><span class="kw-2">mut </span>it = props.into_iter().peekable(); |
| <span class="comment">// While empty alternations aren't possible, we still behave as if they |
| // are. When we have an empty alternate, then clearly the look-around |
| // prefix and suffix is empty. Otherwise, it is the intersection of all |
| // prefixes and suffixes (respectively) of the branches. |
| </span><span class="kw">let </span>fix = <span class="kw">if </span>it.peek().is_none() { |
| LookSet::empty() |
| } <span class="kw">else </span>{ |
| LookSet::full() |
| }; |
| <span class="comment">// And also, an empty alternate means we have 0 static capture groups, |
| // but we otherwise start with the number corresponding to the first |
| // alternate. If any subsequent alternate has a different number of |
| // static capture groups, then we overall have a variation and not a |
| // static number of groups. |
| </span><span class="kw">let </span>static_explicit_captures_len = |
| it.peek().and_then(|p| p.borrow().static_explicit_captures_len()); |
| <span class="comment">// The base case is an empty alternation, which matches nothing. |
| // Note though that empty alternations aren't possible, because the |
| // Hir::alternation smart constructor rewrites those as empty character |
| // classes. |
| </span><span class="kw">let </span><span class="kw-2">mut </span>props = PropertiesI { |
| minimum_len: <span class="prelude-val">None</span>, |
| maximum_len: <span class="prelude-val">None</span>, |
| look_set: LookSet::empty(), |
| look_set_prefix: fix, |
| look_set_suffix: fix, |
| look_set_prefix_any: LookSet::empty(), |
| look_set_suffix_any: LookSet::empty(), |
| utf8: <span class="bool-val">true</span>, |
| explicit_captures_len: <span class="number">0</span>, |
| static_explicit_captures_len, |
| literal: <span class="bool-val">false</span>, |
| alternation_literal: <span class="bool-val">true</span>, |
| }; |
| <span class="kw">let </span>(<span class="kw-2">mut </span>min_poisoned, <span class="kw-2">mut </span>max_poisoned) = (<span class="bool-val">false</span>, <span class="bool-val">false</span>); |
| <span class="comment">// Handle properties that need to visit every child hir. |
| </span><span class="kw">for </span>prop <span class="kw">in </span>it { |
| <span class="kw">let </span>p = prop.borrow(); |
| props.look_set.set_union(p.look_set()); |
| props.look_set_prefix.set_intersect(p.look_set_prefix()); |
| props.look_set_suffix.set_intersect(p.look_set_suffix()); |
| props.look_set_prefix_any.set_union(p.look_set_prefix_any()); |
| props.look_set_suffix_any.set_union(p.look_set_suffix_any()); |
| props.utf8 = props.utf8 && p.is_utf8(); |
| props.explicit_captures_len = props |
| .explicit_captures_len |
| .saturating_add(p.explicit_captures_len()); |
| <span class="kw">if </span>props.static_explicit_captures_len |
| != p.static_explicit_captures_len() |
| { |
| props.static_explicit_captures_len = <span class="prelude-val">None</span>; |
| } |
| props.alternation_literal = |
| props.alternation_literal && p.is_literal(); |
| <span class="kw">if </span>!min_poisoned { |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(xmin) = p.minimum_len() { |
| <span class="kw">if </span>props.minimum_len.map_or(<span class="bool-val">true</span>, |pmin| xmin < pmin) { |
| props.minimum_len = <span class="prelude-val">Some</span>(xmin); |
| } |
| } <span class="kw">else </span>{ |
| props.minimum_len = <span class="prelude-val">None</span>; |
| min_poisoned = <span class="bool-val">true</span>; |
| } |
| } |
| <span class="kw">if </span>!max_poisoned { |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(xmax) = p.maximum_len() { |
| <span class="kw">if </span>props.maximum_len.map_or(<span class="bool-val">true</span>, |pmax| xmax > pmax) { |
| props.maximum_len = <span class="prelude-val">Some</span>(xmax); |
| } |
| } <span class="kw">else </span>{ |
| props.maximum_len = <span class="prelude-val">None</span>; |
| max_poisoned = <span class="bool-val">true</span>; |
| } |
| } |
| } |
| Properties(Box::new(props)) |
| } |
| } |
| |
| <span class="kw">impl </span>Properties { |
| <span class="doccomment">/// Create a new set of HIR properties for an empty regex. |
| </span><span class="kw">fn </span>empty() -> Properties { |
| <span class="kw">let </span>inner = PropertiesI { |
| minimum_len: <span class="prelude-val">Some</span>(<span class="number">0</span>), |
| maximum_len: <span class="prelude-val">Some</span>(<span class="number">0</span>), |
| look_set: LookSet::empty(), |
| look_set_prefix: LookSet::empty(), |
| look_set_suffix: LookSet::empty(), |
| look_set_prefix_any: LookSet::empty(), |
| look_set_suffix_any: LookSet::empty(), |
| <span class="comment">// It is debatable whether an empty regex always matches at valid |
| // UTF-8 boundaries. Strictly speaking, at a byte oriented view, |
| // it is clearly false. There are, for example, many empty strings |
| // between the bytes encoding a '☃'. |
| // |
| // However, when Unicode mode is enabled, the fundamental atom |
| // of matching is really a codepoint. And in that scenario, an |
| // empty regex is defined to only match at valid UTF-8 boundaries |
| // and to never split a codepoint. It just so happens that this |
| // enforcement is somewhat tricky to do for regexes that match |
| // the empty string inside regex engines themselves. It usually |
| // requires some layer above the regex engine to filter out such |
| // matches. |
| // |
| // In any case, 'true' is really the only coherent option. If it |
| // were false, for example, then 'a*' would also need to be false |
| // since it too can match the empty string. |
| </span>utf8: <span class="bool-val">true</span>, |
| explicit_captures_len: <span class="number">0</span>, |
| static_explicit_captures_len: <span class="prelude-val">Some</span>(<span class="number">0</span>), |
| literal: <span class="bool-val">false</span>, |
| alternation_literal: <span class="bool-val">false</span>, |
| }; |
| Properties(Box::new(inner)) |
| } |
| |
| <span class="doccomment">/// Create a new set of HIR properties for a literal regex. |
| </span><span class="kw">fn </span>literal(lit: <span class="kw-2">&</span>Literal) -> Properties { |
| <span class="kw">let </span>inner = PropertiesI { |
| minimum_len: <span class="prelude-val">Some</span>(lit.<span class="number">0</span>.len()), |
| maximum_len: <span class="prelude-val">Some</span>(lit.<span class="number">0</span>.len()), |
| look_set: LookSet::empty(), |
| look_set_prefix: LookSet::empty(), |
| look_set_suffix: LookSet::empty(), |
| look_set_prefix_any: LookSet::empty(), |
| look_set_suffix_any: LookSet::empty(), |
| utf8: core::str::from_utf8(<span class="kw-2">&</span>lit.<span class="number">0</span>).is_ok(), |
| explicit_captures_len: <span class="number">0</span>, |
| static_explicit_captures_len: <span class="prelude-val">Some</span>(<span class="number">0</span>), |
| literal: <span class="bool-val">true</span>, |
| alternation_literal: <span class="bool-val">true</span>, |
| }; |
| Properties(Box::new(inner)) |
| } |
| |
| <span class="doccomment">/// Create a new set of HIR properties for a character class. |
| </span><span class="kw">fn </span>class(class: <span class="kw-2">&</span>Class) -> Properties { |
| <span class="kw">let </span>inner = PropertiesI { |
| minimum_len: class.minimum_len(), |
| maximum_len: class.maximum_len(), |
| look_set: LookSet::empty(), |
| look_set_prefix: LookSet::empty(), |
| look_set_suffix: LookSet::empty(), |
| look_set_prefix_any: LookSet::empty(), |
| look_set_suffix_any: LookSet::empty(), |
| utf8: class.is_utf8(), |
| explicit_captures_len: <span class="number">0</span>, |
| static_explicit_captures_len: <span class="prelude-val">Some</span>(<span class="number">0</span>), |
| literal: <span class="bool-val">false</span>, |
| alternation_literal: <span class="bool-val">false</span>, |
| }; |
| Properties(Box::new(inner)) |
| } |
| |
| <span class="doccomment">/// Create a new set of HIR properties for a look-around assertion. |
| </span><span class="kw">fn </span>look(look: Look) -> Properties { |
| <span class="kw">let </span>inner = PropertiesI { |
| minimum_len: <span class="prelude-val">Some</span>(<span class="number">0</span>), |
| maximum_len: <span class="prelude-val">Some</span>(<span class="number">0</span>), |
| look_set: LookSet::singleton(look), |
| look_set_prefix: LookSet::singleton(look), |
| look_set_suffix: LookSet::singleton(look), |
| look_set_prefix_any: LookSet::singleton(look), |
| look_set_suffix_any: LookSet::singleton(look), |
| <span class="comment">// This requires a little explanation. Basically, we don't consider |
| // matching an empty string to be equivalent to matching invalid |
| // UTF-8, even though technically matching every empty string will |
| // split the UTF-8 encoding of a single codepoint when treating a |
| // UTF-8 encoded string as a sequence of bytes. Our defense here is |
| // that in such a case, a codepoint should logically be treated as |
| // the fundamental atom for matching, and thus the only valid match |
| // points are between codepoints and not bytes. |
| // |
| // More practically, this is true here because it's also true |
| // for 'Hir::empty()', otherwise something like 'a*' would be |
| // considered to match invalid UTF-8. That in turn makes this |
| // property borderline useless. |
| </span>utf8: <span class="bool-val">true</span>, |
| explicit_captures_len: <span class="number">0</span>, |
| static_explicit_captures_len: <span class="prelude-val">Some</span>(<span class="number">0</span>), |
| literal: <span class="bool-val">false</span>, |
| alternation_literal: <span class="bool-val">false</span>, |
| }; |
| Properties(Box::new(inner)) |
| } |
| |
| <span class="doccomment">/// Create a new set of HIR properties for a repetition. |
| </span><span class="kw">fn </span>repetition(rep: <span class="kw-2">&</span>Repetition) -> Properties { |
| <span class="kw">let </span>p = rep.sub.properties(); |
| <span class="kw">let </span>minimum_len = p.minimum_len().map(|child_min| { |
| <span class="kw">let </span>rep_min = usize::try_from(rep.min).unwrap_or(usize::MAX); |
| child_min.saturating_mul(rep_min) |
| }); |
| <span class="kw">let </span>maximum_len = rep.max.and_then(|rep_max| { |
| <span class="kw">let </span>rep_max = usize::try_from(rep_max).ok()<span class="question-mark">?</span>; |
| <span class="kw">let </span>child_max = p.maximum_len()<span class="question-mark">?</span>; |
| child_max.checked_mul(rep_max) |
| }); |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>inner = PropertiesI { |
| minimum_len, |
| maximum_len, |
| look_set: p.look_set(), |
| look_set_prefix: LookSet::empty(), |
| look_set_suffix: LookSet::empty(), |
| look_set_prefix_any: p.look_set_prefix_any(), |
| look_set_suffix_any: p.look_set_suffix_any(), |
| utf8: p.is_utf8(), |
| explicit_captures_len: p.explicit_captures_len(), |
| static_explicit_captures_len: p.static_explicit_captures_len(), |
| literal: <span class="bool-val">false</span>, |
| alternation_literal: <span class="bool-val">false</span>, |
| }; |
| <span class="comment">// If the repetition operator can match the empty string, then its |
| // lookset prefix and suffixes themselves remain empty since they are |
| // no longer required to match. |
| </span><span class="kw">if </span>rep.min > <span class="number">0 </span>{ |
| inner.look_set_prefix = p.look_set_prefix(); |
| inner.look_set_suffix = p.look_set_suffix(); |
| } |
| <span class="comment">// If the static captures len of the sub-expression is not known or is |
| // zero, then it automatically propagates to the repetition, regardless |
| // of the repetition. Otherwise, it might change, but only when the |
| // repetition can match 0 times. |
| </span><span class="kw">if </span>rep.min == <span class="number">0 |
| </span>&& inner.static_explicit_captures_len.map_or(<span class="bool-val">false</span>, |len| len > <span class="number">0</span>) |
| { |
| <span class="comment">// If we require a match 0 times, then our captures len is |
| // guaranteed to be zero. Otherwise, if we *can* match the empty |
| // string, then it's impossible to know how many captures will be |
| // in the resulting match. |
| </span><span class="kw">if </span>rep.max == <span class="prelude-val">Some</span>(<span class="number">0</span>) { |
| inner.static_explicit_captures_len = <span class="prelude-val">Some</span>(<span class="number">0</span>); |
| } <span class="kw">else </span>{ |
| inner.static_explicit_captures_len = <span class="prelude-val">None</span>; |
| } |
| } |
| Properties(Box::new(inner)) |
| } |
| |
| <span class="doccomment">/// Create a new set of HIR properties for a capture. |
| </span><span class="kw">fn </span>capture(capture: <span class="kw-2">&</span>Capture) -> Properties { |
| <span class="kw">let </span>p = capture.sub.properties(); |
| Properties(Box::new(PropertiesI { |
| explicit_captures_len: p.explicit_captures_len().saturating_add(<span class="number">1</span>), |
| static_explicit_captures_len: p |
| .static_explicit_captures_len() |
| .map(|len| len.saturating_add(<span class="number">1</span>)), |
| literal: <span class="bool-val">false</span>, |
| alternation_literal: <span class="bool-val">false</span>, |
| ..<span class="kw-2">*</span>p.<span class="number">0</span>.clone() |
| })) |
| } |
| |
| <span class="doccomment">/// Create a new set of HIR properties for a concatenation. |
| </span><span class="kw">fn </span>concat(concat: <span class="kw-2">&</span>[Hir]) -> Properties { |
| <span class="comment">// The base case is an empty concatenation, which matches the empty |
| // string. Note though that empty concatenations aren't possible, |
| // because the Hir::concat smart constructor rewrites those as |
| // Hir::empty. |
| </span><span class="kw">let </span><span class="kw-2">mut </span>props = PropertiesI { |
| minimum_len: <span class="prelude-val">Some</span>(<span class="number">0</span>), |
| maximum_len: <span class="prelude-val">Some</span>(<span class="number">0</span>), |
| look_set: LookSet::empty(), |
| look_set_prefix: LookSet::empty(), |
| look_set_suffix: LookSet::empty(), |
| look_set_prefix_any: LookSet::empty(), |
| look_set_suffix_any: LookSet::empty(), |
| utf8: <span class="bool-val">true</span>, |
| explicit_captures_len: <span class="number">0</span>, |
| static_explicit_captures_len: <span class="prelude-val">Some</span>(<span class="number">0</span>), |
| literal: <span class="bool-val">true</span>, |
| alternation_literal: <span class="bool-val">true</span>, |
| }; |
| <span class="comment">// Handle properties that need to visit every child hir. |
| </span><span class="kw">for </span>x <span class="kw">in </span>concat.iter() { |
| <span class="kw">let </span>p = x.properties(); |
| props.look_set.set_union(p.look_set()); |
| props.utf8 = props.utf8 && p.is_utf8(); |
| props.explicit_captures_len = props |
| .explicit_captures_len |
| .saturating_add(p.explicit_captures_len()); |
| props.static_explicit_captures_len = p |
| .static_explicit_captures_len() |
| .and_then(|len1| { |
| <span class="prelude-val">Some</span>((len1, props.static_explicit_captures_len<span class="question-mark">?</span>)) |
| }) |
| .and_then(|(len1, len2)| <span class="prelude-val">Some</span>(len1.saturating_add(len2))); |
| props.literal = props.literal && p.is_literal(); |
| props.alternation_literal = |
| props.alternation_literal && p.is_alternation_literal(); |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(minimum_len) = props.minimum_len { |
| <span class="kw">match </span>p.minimum_len() { |
| <span class="prelude-val">None </span>=> props.minimum_len = <span class="prelude-val">None</span>, |
| <span class="prelude-val">Some</span>(len) => { |
| <span class="comment">// We use saturating arithmetic here because the |
| // minimum is just a lower bound. We can't go any |
| // higher than what our number types permit. |
| </span>props.minimum_len = |
| <span class="prelude-val">Some</span>(minimum_len.saturating_add(len)); |
| } |
| } |
| } |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(maximum_len) = props.maximum_len { |
| <span class="kw">match </span>p.maximum_len() { |
| <span class="prelude-val">None </span>=> props.maximum_len = <span class="prelude-val">None</span>, |
| <span class="prelude-val">Some</span>(len) => { |
| props.maximum_len = maximum_len.checked_add(len) |
| } |
| } |
| } |
| } |
| <span class="comment">// Handle the prefix properties, which only requires visiting |
| // child exprs until one matches more than the empty string. |
| </span><span class="kw">let </span><span class="kw-2">mut </span>it = concat.iter(); |
| <span class="kw">while let </span><span class="prelude-val">Some</span>(x) = it.next() { |
| props.look_set_prefix.set_union(x.properties().look_set_prefix()); |
| props |
| .look_set_prefix_any |
| .set_union(x.properties().look_set_prefix_any()); |
| <span class="kw">if </span>x.properties().maximum_len().map_or(<span class="bool-val">true</span>, |x| x > <span class="number">0</span>) { |
| <span class="kw">break</span>; |
| } |
| } |
| <span class="comment">// Same thing for the suffix properties, but in reverse. |
| </span><span class="kw">let </span><span class="kw-2">mut </span>it = concat.iter().rev(); |
| <span class="kw">while let </span><span class="prelude-val">Some</span>(x) = it.next() { |
| props.look_set_suffix.set_union(x.properties().look_set_suffix()); |
| props |
| .look_set_suffix_any |
| .set_union(x.properties().look_set_suffix_any()); |
| <span class="kw">if </span>x.properties().maximum_len().map_or(<span class="bool-val">true</span>, |x| x > <span class="number">0</span>) { |
| <span class="kw">break</span>; |
| } |
| } |
| Properties(Box::new(props)) |
| } |
| |
| <span class="doccomment">/// Create a new set of HIR properties for a concatenation. |
| </span><span class="kw">fn </span>alternation(alts: <span class="kw-2">&</span>[Hir]) -> Properties { |
| Properties::union(alts.iter().map(|hir| hir.properties())) |
| } |
| } |
| |
| <span class="doccomment">/// A set of look-around assertions. |
| /// |
| /// This is useful for efficiently tracking look-around assertions. For |
| /// example, an [`Hir`] provides properties that return `LookSet`s. |
| </span><span class="attribute">#[derive(Clone, Copy, Default, Eq, PartialEq)] |
| </span><span class="kw">pub struct </span>LookSet { |
| <span class="doccomment">/// The underlying representation this set is exposed to make it possible |
| /// to store it somewhere efficiently. The representation is that |
| /// of a bitset, where each assertion occupies bit `i` where `i = |
| /// Look::as_repr()`. |
| /// |
| /// Note that users of this internal representation must permit the full |
| /// range of `u16` values to be represented. For example, even if the |
| /// current implementation only makes use of the 10 least significant bits, |
| /// it may use more bits in a future semver compatible release. |
| </span><span class="kw">pub </span>bits: u16, |
| } |
| |
| <span class="kw">impl </span>LookSet { |
| <span class="doccomment">/// Create an empty set of look-around assertions. |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>empty() -> LookSet { |
| LookSet { bits: <span class="number">0 </span>} |
| } |
| |
| <span class="doccomment">/// Create a full set of look-around assertions. |
| /// |
| /// This set contains all possible look-around assertions. |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>full() -> LookSet { |
| LookSet { bits: !<span class="number">0 </span>} |
| } |
| |
| <span class="doccomment">/// Create a look-around set containing the look-around assertion given. |
| /// |
| /// This is a convenience routine for creating an empty set and inserting |
| /// one look-around assertions. |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>singleton(look: Look) -> LookSet { |
| LookSet::empty().insert(look) |
| } |
| |
| <span class="doccomment">/// Returns the total number of look-around assertions in this set. |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>len(<span class="self">self</span>) -> usize { |
| <span class="comment">// OK because max value always fits in a u8, which in turn always |
| // fits in a usize, regardless of target. |
| </span>usize::try_from(<span class="self">self</span>.bits.count_ones()).unwrap() |
| } |
| |
| <span class="doccomment">/// Returns true if and only if this set is empty. |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>is_empty(<span class="self">self</span>) -> bool { |
| <span class="self">self</span>.len() == <span class="number">0 |
| </span>} |
| |
| <span class="doccomment">/// Returns true if and only if the given look-around assertion is in this |
| /// set. |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>contains(<span class="self">self</span>, look: Look) -> bool { |
| <span class="self">self</span>.bits & look.as_repr() != <span class="number">0 |
| </span>} |
| |
| <span class="doccomment">/// Returns true if and only if this set contains any anchor assertions. |
| /// This includes both "start/end of haystack" and "start/end of line." |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>contains_anchor(<span class="kw-2">&</span><span class="self">self</span>) -> bool { |
| <span class="self">self</span>.contains_anchor_haystack() || <span class="self">self</span>.contains_anchor_line() |
| } |
| |
| <span class="doccomment">/// Returns true if and only if this set contains any "start/end of |
| /// haystack" anchors. This doesn't include "start/end of line" anchors. |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>contains_anchor_haystack(<span class="kw-2">&</span><span class="self">self</span>) -> bool { |
| <span class="self">self</span>.contains(Look::Start) || <span class="self">self</span>.contains(Look::End) |
| } |
| |
| <span class="doccomment">/// Returns true if and only if this set contains any "start/end of line" |
| /// anchors. This doesn't include "start/end of haystack" anchors. This |
| /// includes both `\n` line anchors and CRLF (`\r\n`) aware line anchors. |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>contains_anchor_line(<span class="kw-2">&</span><span class="self">self</span>) -> bool { |
| <span class="self">self</span>.contains(Look::StartLF) |
| || <span class="self">self</span>.contains(Look::EndLF) |
| || <span class="self">self</span>.contains(Look::StartCRLF) |
| || <span class="self">self</span>.contains(Look::EndCRLF) |
| } |
| |
| <span class="doccomment">/// Returns true if and only if this set contains any "start/end of line" |
| /// anchors that only treat `\n` as line terminators. This does not include |
| /// haystack anchors or CRLF aware line anchors. |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>contains_anchor_lf(<span class="kw-2">&</span><span class="self">self</span>) -> bool { |
| <span class="self">self</span>.contains(Look::StartLF) || <span class="self">self</span>.contains(Look::EndLF) |
| } |
| |
| <span class="doccomment">/// Returns true if and only if this set contains any "start/end of line" |
| /// anchors that are CRLF-aware. This doesn't include "start/end of |
| /// haystack" or "start/end of line-feed" anchors. |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>contains_anchor_crlf(<span class="kw-2">&</span><span class="self">self</span>) -> bool { |
| <span class="self">self</span>.contains(Look::StartCRLF) || <span class="self">self</span>.contains(Look::EndCRLF) |
| } |
| |
| <span class="doccomment">/// Returns true if and only if this set contains any word boundary or |
| /// negated word boundary assertions. This include both Unicode and ASCII |
| /// word boundaries. |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>contains_word(<span class="self">self</span>) -> bool { |
| <span class="self">self</span>.contains_word_unicode() || <span class="self">self</span>.contains_word_ascii() |
| } |
| |
| <span class="doccomment">/// Returns true if and only if this set contains any Unicode word boundary |
| /// or negated Unicode word boundary assertions. |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>contains_word_unicode(<span class="self">self</span>) -> bool { |
| <span class="self">self</span>.contains(Look::WordUnicode) |
| || <span class="self">self</span>.contains(Look::WordUnicodeNegate) |
| } |
| |
| <span class="doccomment">/// Returns true if and only if this set contains any ASCII word boundary |
| /// or negated ASCII word boundary assertions. |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>contains_word_ascii(<span class="self">self</span>) -> bool { |
| <span class="self">self</span>.contains(Look::WordAscii) || <span class="self">self</span>.contains(Look::WordAsciiNegate) |
| } |
| |
| <span class="doccomment">/// Returns an iterator over all of the look-around assertions in this set. |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>iter(<span class="self">self</span>) -> LookSetIter { |
| LookSetIter { set: <span class="self">self </span>} |
| } |
| |
| <span class="doccomment">/// Return a new set that is equivalent to the original, but with the given |
| /// assertion added to it. If the assertion is already in the set, then the |
| /// returned set is equivalent to the original. |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>insert(<span class="self">self</span>, look: Look) -> LookSet { |
| LookSet { bits: <span class="self">self</span>.bits | look.as_repr() } |
| } |
| |
| <span class="doccomment">/// Updates this set in place with the result of inserting the given |
| /// assertion into this set. |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>set_insert(<span class="kw-2">&mut </span><span class="self">self</span>, look: Look) { |
| <span class="kw-2">*</span><span class="self">self </span>= <span class="self">self</span>.insert(look); |
| } |
| |
| <span class="doccomment">/// Return a new set that is equivalent to the original, but with the given |
| /// assertion removed from it. If the assertion is not in the set, then the |
| /// returned set is equivalent to the original. |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>remove(<span class="self">self</span>, look: Look) -> LookSet { |
| LookSet { bits: <span class="self">self</span>.bits & !look.as_repr() } |
| } |
| |
| <span class="doccomment">/// Updates this set in place with the result of removing the given |
| /// assertion from this set. |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>set_remove(<span class="kw-2">&mut </span><span class="self">self</span>, look: Look) { |
| <span class="kw-2">*</span><span class="self">self </span>= <span class="self">self</span>.remove(look); |
| } |
| |
| <span class="doccomment">/// Returns a new set that is the result of subtracting the given set from |
| /// this set. |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>subtract(<span class="self">self</span>, other: LookSet) -> LookSet { |
| LookSet { bits: <span class="self">self</span>.bits & !other.bits } |
| } |
| |
| <span class="doccomment">/// Updates this set in place with the result of subtracting the given set |
| /// from this set. |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>set_subtract(<span class="kw-2">&mut </span><span class="self">self</span>, other: LookSet) { |
| <span class="kw-2">*</span><span class="self">self </span>= <span class="self">self</span>.subtract(other); |
| } |
| |
| <span class="doccomment">/// Returns a new set that is the union of this and the one given. |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>union(<span class="self">self</span>, other: LookSet) -> LookSet { |
| LookSet { bits: <span class="self">self</span>.bits | other.bits } |
| } |
| |
| <span class="doccomment">/// Updates this set in place with the result of unioning it with the one |
| /// given. |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>set_union(<span class="kw-2">&mut </span><span class="self">self</span>, other: LookSet) { |
| <span class="kw-2">*</span><span class="self">self </span>= <span class="self">self</span>.union(other); |
| } |
| |
| <span class="doccomment">/// Returns a new set that is the intersection of this and the one given. |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>intersect(<span class="self">self</span>, other: LookSet) -> LookSet { |
| LookSet { bits: <span class="self">self</span>.bits & other.bits } |
| } |
| |
| <span class="doccomment">/// Updates this set in place with the result of intersecting it with the |
| /// one given. |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>set_intersect(<span class="kw-2">&mut </span><span class="self">self</span>, other: LookSet) { |
| <span class="kw-2">*</span><span class="self">self </span>= <span class="self">self</span>.intersect(other); |
| } |
| |
| <span class="doccomment">/// Return a `LookSet` from the slice given as a native endian 16-bit |
| /// integer. |
| /// |
| /// # Panics |
| /// |
| /// This panics if `slice.len() < 2`. |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>read_repr(slice: <span class="kw-2">&</span>[u8]) -> LookSet { |
| <span class="kw">let </span>bits = u16::from_ne_bytes(slice[..<span class="number">2</span>].try_into().unwrap()); |
| LookSet { bits } |
| } |
| |
| <span class="doccomment">/// Write a `LookSet` as a native endian 16-bit integer to the beginning |
| /// of the slice given. |
| /// |
| /// # Panics |
| /// |
| /// This panics if `slice.len() < 2`. |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>write_repr(<span class="self">self</span>, slice: <span class="kw-2">&mut </span>[u8]) { |
| <span class="kw">let </span>raw = <span class="self">self</span>.bits.to_ne_bytes(); |
| slice[<span class="number">0</span>] = raw[<span class="number">0</span>]; |
| slice[<span class="number">1</span>] = raw[<span class="number">1</span>]; |
| } |
| } |
| |
| <span class="kw">impl </span>core::fmt::Debug <span class="kw">for </span>LookSet { |
| <span class="kw">fn </span>fmt(<span class="kw-2">&</span><span class="self">self</span>, f: <span class="kw-2">&mut </span>core::fmt::Formatter) -> core::fmt::Result { |
| <span class="kw">if </span><span class="self">self</span>.is_empty() { |
| <span class="kw">return </span><span class="macro">write!</span>(f, <span class="string">"∅"</span>); |
| } |
| <span class="kw">for </span>look <span class="kw">in </span><span class="self">self</span>.iter() { |
| <span class="macro">write!</span>(f, <span class="string">"{}"</span>, look.as_char())<span class="question-mark">?</span>; |
| } |
| <span class="prelude-val">Ok</span>(()) |
| } |
| } |
| |
| <span class="doccomment">/// An iterator over all look-around assertions in a [`LookSet`]. |
| /// |
| /// This iterator is created by [`LookSet::iter`]. |
| </span><span class="attribute">#[derive(Clone, Debug)] |
| </span><span class="kw">pub struct </span>LookSetIter { |
| set: LookSet, |
| } |
| |
| <span class="kw">impl </span>Iterator <span class="kw">for </span>LookSetIter { |
| <span class="kw">type </span>Item = Look; |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>next(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><Look> { |
| <span class="kw">if </span><span class="self">self</span>.set.is_empty() { |
| <span class="kw">return </span><span class="prelude-val">None</span>; |
| } |
| <span class="comment">// We'll never have more than u8::MAX distinct look-around assertions, |
| // so 'repr' will always fit into a u16. |
| </span><span class="kw">let </span>repr = u16::try_from(<span class="self">self</span>.set.bits.trailing_zeros()).unwrap(); |
| <span class="kw">let </span>look = Look::from_repr(<span class="number">1 </span><< repr)<span class="question-mark">?</span>; |
| <span class="self">self</span>.set = <span class="self">self</span>.set.remove(look); |
| <span class="prelude-val">Some</span>(look) |
| } |
| } |
| |
| <span class="doccomment">/// Given a sequence of HIR values where each value corresponds to a Unicode |
| /// class (or an all-ASCII byte class), return a single Unicode class |
| /// corresponding to the union of the classes found. |
| </span><span class="kw">fn </span>class_chars(hirs: <span class="kw-2">&</span>[Hir]) -> <span class="prelude-ty">Option</span><Class> { |
| <span class="kw">let </span><span class="kw-2">mut </span>cls = ClassUnicode::new(<span class="macro">vec!</span>[]); |
| <span class="kw">for </span>hir <span class="kw">in </span>hirs.iter() { |
| <span class="kw">match </span><span class="kw-2">*</span>hir.kind() { |
| HirKind::Class(Class::Unicode(<span class="kw-2">ref </span>cls2)) => { |
| cls.union(cls2); |
| } |
| HirKind::Class(Class::Bytes(<span class="kw-2">ref </span>cls2)) => { |
| cls.union(<span class="kw-2">&</span>cls2.to_unicode_class()<span class="question-mark">?</span>); |
| } |
| <span class="kw">_ </span>=> <span class="kw">return </span><span class="prelude-val">None</span>, |
| }; |
| } |
| <span class="prelude-val">Some</span>(Class::Unicode(cls)) |
| } |
| |
| <span class="doccomment">/// Given a sequence of HIR values where each value corresponds to a byte class |
| /// (or an all-ASCII Unicode class), return a single byte class corresponding |
| /// to the union of the classes found. |
| </span><span class="kw">fn </span>class_bytes(hirs: <span class="kw-2">&</span>[Hir]) -> <span class="prelude-ty">Option</span><Class> { |
| <span class="kw">let </span><span class="kw-2">mut </span>cls = ClassBytes::new(<span class="macro">vec!</span>[]); |
| <span class="kw">for </span>hir <span class="kw">in </span>hirs.iter() { |
| <span class="kw">match </span><span class="kw-2">*</span>hir.kind() { |
| HirKind::Class(Class::Unicode(<span class="kw-2">ref </span>cls2)) => { |
| cls.union(<span class="kw-2">&</span>cls2.to_byte_class()<span class="question-mark">?</span>); |
| } |
| HirKind::Class(Class::Bytes(<span class="kw-2">ref </span>cls2)) => { |
| cls.union(cls2); |
| } |
| <span class="kw">_ </span>=> <span class="kw">return </span><span class="prelude-val">None</span>, |
| }; |
| } |
| <span class="prelude-val">Some</span>(Class::Bytes(cls)) |
| } |
| |
| <span class="doccomment">/// Given a sequence of HIR values where each value corresponds to a literal |
| /// that is a single `char`, return that sequence of `char`s. Otherwise return |
| /// None. No deduplication is done. |
| </span><span class="kw">fn </span>singleton_chars(hirs: <span class="kw-2">&</span>[Hir]) -> <span class="prelude-ty">Option</span><Vec<char>> { |
| <span class="kw">let </span><span class="kw-2">mut </span>singletons = <span class="macro">vec!</span>[]; |
| <span class="kw">for </span>hir <span class="kw">in </span>hirs.iter() { |
| <span class="kw">let </span>literal = <span class="kw">match </span><span class="kw-2">*</span>hir.kind() { |
| HirKind::Literal(Literal(<span class="kw-2">ref </span>bytes)) => bytes, |
| <span class="kw">_ </span>=> <span class="kw">return </span><span class="prelude-val">None</span>, |
| }; |
| <span class="kw">let </span>ch = <span class="kw">match </span><span class="kw">crate</span>::debug::utf8_decode(literal) { |
| <span class="prelude-val">None </span>=> <span class="kw">return </span><span class="prelude-val">None</span>, |
| <span class="prelude-val">Some</span>(<span class="prelude-val">Err</span>(<span class="kw">_</span>)) => <span class="kw">return </span><span class="prelude-val">None</span>, |
| <span class="prelude-val">Some</span>(<span class="prelude-val">Ok</span>(ch)) => ch, |
| }; |
| <span class="kw">if </span>literal.len() != ch.len_utf8() { |
| <span class="kw">return </span><span class="prelude-val">None</span>; |
| } |
| singletons.push(ch); |
| } |
| <span class="prelude-val">Some</span>(singletons) |
| } |
| |
| <span class="doccomment">/// Given a sequence of HIR values where each value corresponds to a literal |
| /// that is a single byte, return that sequence of bytes. Otherwise return |
| /// None. No deduplication is done. |
| </span><span class="kw">fn </span>singleton_bytes(hirs: <span class="kw-2">&</span>[Hir]) -> <span class="prelude-ty">Option</span><Vec<u8>> { |
| <span class="kw">let </span><span class="kw-2">mut </span>singletons = <span class="macro">vec!</span>[]; |
| <span class="kw">for </span>hir <span class="kw">in </span>hirs.iter() { |
| <span class="kw">let </span>literal = <span class="kw">match </span><span class="kw-2">*</span>hir.kind() { |
| HirKind::Literal(Literal(<span class="kw-2">ref </span>bytes)) => bytes, |
| <span class="kw">_ </span>=> <span class="kw">return </span><span class="prelude-val">None</span>, |
| }; |
| <span class="kw">if </span>literal.len() != <span class="number">1 </span>{ |
| <span class="kw">return </span><span class="prelude-val">None</span>; |
| } |
| singletons.push(literal[<span class="number">0</span>]); |
| } |
| <span class="prelude-val">Some</span>(singletons) |
| } |
| |
| <span class="doccomment">/// Looks for a common prefix in the list of alternation branches given. If one |
| /// is found, then an equivalent but (hopefully) simplified Hir is returned. |
| /// Otherwise, the original given list of branches is returned unmodified. |
| /// |
| /// This is not quite as good as it could be. Right now, it requires that |
| /// all branches are 'Concat' expressions. It also doesn't do well with |
| /// literals. For example, given 'foofoo|foobar', it will not refactor it to |
| /// 'foo(?:foo|bar)' because literals are flattened into their own special |
| /// concatenation. (One wonders if perhaps 'Literal' should be a single atom |
| /// instead of a string of bytes because of this. Otherwise, handling the |
| /// current representation in this routine will be pretty gnarly. Sigh.) |
| </span><span class="kw">fn </span>lift_common_prefix(hirs: Vec<Hir>) -> <span class="prelude-ty">Result</span><Hir, Vec<Hir>> { |
| <span class="kw">if </span>hirs.len() <= <span class="number">1 </span>{ |
| <span class="kw">return </span><span class="prelude-val">Err</span>(hirs); |
| } |
| <span class="kw">let </span><span class="kw-2">mut </span>prefix = <span class="kw">match </span>hirs[<span class="number">0</span>].kind() { |
| HirKind::Concat(<span class="kw-2">ref </span>xs) => <span class="kw-2">&**</span>xs, |
| <span class="kw">_ </span>=> <span class="kw">return </span><span class="prelude-val">Err</span>(hirs), |
| }; |
| <span class="kw">if </span>prefix.is_empty() { |
| <span class="kw">return </span><span class="prelude-val">Err</span>(hirs); |
| } |
| <span class="kw">for </span>h <span class="kw">in </span>hirs.iter().skip(<span class="number">1</span>) { |
| <span class="kw">let </span>concat = <span class="kw">match </span>h.kind() { |
| HirKind::Concat(<span class="kw-2">ref </span>xs) => xs, |
| <span class="kw">_ </span>=> <span class="kw">return </span><span class="prelude-val">Err</span>(hirs), |
| }; |
| <span class="kw">let </span>common_len = prefix |
| .iter() |
| .zip(concat.iter()) |
| .take_while(|(x, y)| x == y) |
| .count(); |
| prefix = <span class="kw-2">&</span>prefix[..common_len]; |
| <span class="kw">if </span>prefix.is_empty() { |
| <span class="kw">return </span><span class="prelude-val">Err</span>(hirs); |
| } |
| } |
| <span class="kw">let </span>len = prefix.len(); |
| <span class="macro">assert_ne!</span>(<span class="number">0</span>, len); |
| <span class="kw">let </span><span class="kw-2">mut </span>prefix_concat = <span class="macro">vec!</span>[]; |
| <span class="kw">let </span><span class="kw-2">mut </span>suffix_alts = <span class="macro">vec!</span>[]; |
| <span class="kw">for </span>h <span class="kw">in </span>hirs { |
| <span class="kw">let </span><span class="kw-2">mut </span>concat = <span class="kw">match </span>h.into_kind() { |
| HirKind::Concat(xs) => xs, |
| <span class="comment">// We required all sub-expressions to be |
| // concats above, so we're only here if we |
| // have a concat. |
| </span><span class="kw">_ </span>=> <span class="macro">unreachable!</span>(), |
| }; |
| suffix_alts.push(Hir::concat(concat.split_off(len))); |
| <span class="kw">if </span>prefix_concat.is_empty() { |
| prefix_concat = concat; |
| } |
| } |
| <span class="kw">let </span><span class="kw-2">mut </span>concat = prefix_concat; |
| concat.push(Hir::alternation(suffix_alts)); |
| <span class="prelude-val">Ok</span>(Hir::concat(concat)) |
| } |
| |
| <span class="attribute">#[cfg(test)] |
| </span><span class="kw">mod </span>tests { |
| <span class="kw">use super</span>::<span class="kw-2">*</span>; |
| |
| <span class="kw">fn </span>uclass(ranges: <span class="kw-2">&</span>[(char, char)]) -> ClassUnicode { |
| <span class="kw">let </span>ranges: Vec<ClassUnicodeRange> = ranges |
| .iter() |
| .map(|<span class="kw-2">&</span>(s, e)| ClassUnicodeRange::new(s, e)) |
| .collect(); |
| ClassUnicode::new(ranges) |
| } |
| |
| <span class="kw">fn </span>bclass(ranges: <span class="kw-2">&</span>[(u8, u8)]) -> ClassBytes { |
| <span class="kw">let </span>ranges: Vec<ClassBytesRange> = |
| ranges.iter().map(|<span class="kw-2">&</span>(s, e)| ClassBytesRange::new(s, e)).collect(); |
| ClassBytes::new(ranges) |
| } |
| |
| <span class="kw">fn </span>uranges(cls: <span class="kw-2">&</span>ClassUnicode) -> Vec<(char, char)> { |
| cls.iter().map(|x| (x.start(), x.end())).collect() |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"unicode-case"</span>)] |
| </span><span class="kw">fn </span>ucasefold(cls: <span class="kw-2">&</span>ClassUnicode) -> ClassUnicode { |
| <span class="kw">let </span><span class="kw-2">mut </span>cls_ = cls.clone(); |
| cls_.case_fold_simple(); |
| cls_ |
| } |
| |
| <span class="kw">fn </span>uunion(cls1: <span class="kw-2">&</span>ClassUnicode, cls2: <span class="kw-2">&</span>ClassUnicode) -> ClassUnicode { |
| <span class="kw">let </span><span class="kw-2">mut </span>cls_ = cls1.clone(); |
| cls_.union(cls2); |
| cls_ |
| } |
| |
| <span class="kw">fn </span>uintersect(cls1: <span class="kw-2">&</span>ClassUnicode, cls2: <span class="kw-2">&</span>ClassUnicode) -> ClassUnicode { |
| <span class="kw">let </span><span class="kw-2">mut </span>cls_ = cls1.clone(); |
| cls_.intersect(cls2); |
| cls_ |
| } |
| |
| <span class="kw">fn </span>udifference(cls1: <span class="kw-2">&</span>ClassUnicode, cls2: <span class="kw-2">&</span>ClassUnicode) -> ClassUnicode { |
| <span class="kw">let </span><span class="kw-2">mut </span>cls_ = cls1.clone(); |
| cls_.difference(cls2); |
| cls_ |
| } |
| |
| <span class="kw">fn </span>usymdifference( |
| cls1: <span class="kw-2">&</span>ClassUnicode, |
| cls2: <span class="kw-2">&</span>ClassUnicode, |
| ) -> ClassUnicode { |
| <span class="kw">let </span><span class="kw-2">mut </span>cls_ = cls1.clone(); |
| cls_.symmetric_difference(cls2); |
| cls_ |
| } |
| |
| <span class="kw">fn </span>unegate(cls: <span class="kw-2">&</span>ClassUnicode) -> ClassUnicode { |
| <span class="kw">let </span><span class="kw-2">mut </span>cls_ = cls.clone(); |
| cls_.negate(); |
| cls_ |
| } |
| |
| <span class="kw">fn </span>branges(cls: <span class="kw-2">&</span>ClassBytes) -> Vec<(u8, u8)> { |
| cls.iter().map(|x| (x.start(), x.end())).collect() |
| } |
| |
| <span class="kw">fn </span>bcasefold(cls: <span class="kw-2">&</span>ClassBytes) -> ClassBytes { |
| <span class="kw">let </span><span class="kw-2">mut </span>cls_ = cls.clone(); |
| cls_.case_fold_simple(); |
| cls_ |
| } |
| |
| <span class="kw">fn </span>bunion(cls1: <span class="kw-2">&</span>ClassBytes, cls2: <span class="kw-2">&</span>ClassBytes) -> ClassBytes { |
| <span class="kw">let </span><span class="kw-2">mut </span>cls_ = cls1.clone(); |
| cls_.union(cls2); |
| cls_ |
| } |
| |
| <span class="kw">fn </span>bintersect(cls1: <span class="kw-2">&</span>ClassBytes, cls2: <span class="kw-2">&</span>ClassBytes) -> ClassBytes { |
| <span class="kw">let </span><span class="kw-2">mut </span>cls_ = cls1.clone(); |
| cls_.intersect(cls2); |
| cls_ |
| } |
| |
| <span class="kw">fn </span>bdifference(cls1: <span class="kw-2">&</span>ClassBytes, cls2: <span class="kw-2">&</span>ClassBytes) -> ClassBytes { |
| <span class="kw">let </span><span class="kw-2">mut </span>cls_ = cls1.clone(); |
| cls_.difference(cls2); |
| cls_ |
| } |
| |
| <span class="kw">fn </span>bsymdifference(cls1: <span class="kw-2">&</span>ClassBytes, cls2: <span class="kw-2">&</span>ClassBytes) -> ClassBytes { |
| <span class="kw">let </span><span class="kw-2">mut </span>cls_ = cls1.clone(); |
| cls_.symmetric_difference(cls2); |
| cls_ |
| } |
| |
| <span class="kw">fn </span>bnegate(cls: <span class="kw-2">&</span>ClassBytes) -> ClassBytes { |
| <span class="kw">let </span><span class="kw-2">mut </span>cls_ = cls.clone(); |
| cls_.negate(); |
| cls_ |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>class_range_canonical_unicode() { |
| <span class="kw">let </span>range = ClassUnicodeRange::new(<span class="string">'\u{00FF}'</span>, <span class="string">'\0'</span>); |
| <span class="macro">assert_eq!</span>(<span class="string">'\0'</span>, range.start()); |
| <span class="macro">assert_eq!</span>(<span class="string">'\u{00FF}'</span>, range.end()); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>class_range_canonical_bytes() { |
| <span class="kw">let </span>range = ClassBytesRange::new(<span class="string">b'\xFF'</span>, <span class="string">b'\0'</span>); |
| <span class="macro">assert_eq!</span>(<span class="string">b'\0'</span>, range.start()); |
| <span class="macro">assert_eq!</span>(<span class="string">b'\xFF'</span>, range.end()); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>class_canonicalize_unicode() { |
| <span class="kw">let </span>cls = uclass(<span class="kw-2">&</span>[(<span class="string">'a'</span>, <span class="string">'c'</span>), (<span class="string">'x'</span>, <span class="string">'z'</span>)]); |
| <span class="kw">let </span>expected = <span class="macro">vec!</span>[(<span class="string">'a'</span>, <span class="string">'c'</span>), (<span class="string">'x'</span>, <span class="string">'z'</span>)]; |
| <span class="macro">assert_eq!</span>(expected, uranges(<span class="kw-2">&</span>cls)); |
| |
| <span class="kw">let </span>cls = uclass(<span class="kw-2">&</span>[(<span class="string">'x'</span>, <span class="string">'z'</span>), (<span class="string">'a'</span>, <span class="string">'c'</span>)]); |
| <span class="kw">let </span>expected = <span class="macro">vec!</span>[(<span class="string">'a'</span>, <span class="string">'c'</span>), (<span class="string">'x'</span>, <span class="string">'z'</span>)]; |
| <span class="macro">assert_eq!</span>(expected, uranges(<span class="kw-2">&</span>cls)); |
| |
| <span class="kw">let </span>cls = uclass(<span class="kw-2">&</span>[(<span class="string">'x'</span>, <span class="string">'z'</span>), (<span class="string">'w'</span>, <span class="string">'y'</span>)]); |
| <span class="kw">let </span>expected = <span class="macro">vec!</span>[(<span class="string">'w'</span>, <span class="string">'z'</span>)]; |
| <span class="macro">assert_eq!</span>(expected, uranges(<span class="kw-2">&</span>cls)); |
| |
| <span class="kw">let </span>cls = uclass(<span class="kw-2">&</span>[ |
| (<span class="string">'c'</span>, <span class="string">'f'</span>), |
| (<span class="string">'a'</span>, <span class="string">'g'</span>), |
| (<span class="string">'d'</span>, <span class="string">'j'</span>), |
| (<span class="string">'a'</span>, <span class="string">'c'</span>), |
| (<span class="string">'m'</span>, <span class="string">'p'</span>), |
| (<span class="string">'l'</span>, <span class="string">'s'</span>), |
| ]); |
| <span class="kw">let </span>expected = <span class="macro">vec!</span>[(<span class="string">'a'</span>, <span class="string">'j'</span>), (<span class="string">'l'</span>, <span class="string">'s'</span>)]; |
| <span class="macro">assert_eq!</span>(expected, uranges(<span class="kw-2">&</span>cls)); |
| |
| <span class="kw">let </span>cls = uclass(<span class="kw-2">&</span>[(<span class="string">'x'</span>, <span class="string">'z'</span>), (<span class="string">'u'</span>, <span class="string">'w'</span>)]); |
| <span class="kw">let </span>expected = <span class="macro">vec!</span>[(<span class="string">'u'</span>, <span class="string">'z'</span>)]; |
| <span class="macro">assert_eq!</span>(expected, uranges(<span class="kw-2">&</span>cls)); |
| |
| <span class="kw">let </span>cls = uclass(<span class="kw-2">&</span>[(<span class="string">'\x00'</span>, <span class="string">'\u{10FFFF}'</span>), (<span class="string">'\x00'</span>, <span class="string">'\u{10FFFF}'</span>)]); |
| <span class="kw">let </span>expected = <span class="macro">vec!</span>[(<span class="string">'\x00'</span>, <span class="string">'\u{10FFFF}'</span>)]; |
| <span class="macro">assert_eq!</span>(expected, uranges(<span class="kw-2">&</span>cls)); |
| |
| <span class="kw">let </span>cls = uclass(<span class="kw-2">&</span>[(<span class="string">'a'</span>, <span class="string">'a'</span>), (<span class="string">'b'</span>, <span class="string">'b'</span>)]); |
| <span class="kw">let </span>expected = <span class="macro">vec!</span>[(<span class="string">'a'</span>, <span class="string">'b'</span>)]; |
| <span class="macro">assert_eq!</span>(expected, uranges(<span class="kw-2">&</span>cls)); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>class_canonicalize_bytes() { |
| <span class="kw">let </span>cls = bclass(<span class="kw-2">&</span>[(<span class="string">b'a'</span>, <span class="string">b'c'</span>), (<span class="string">b'x'</span>, <span class="string">b'z'</span>)]); |
| <span class="kw">let </span>expected = <span class="macro">vec!</span>[(<span class="string">b'a'</span>, <span class="string">b'c'</span>), (<span class="string">b'x'</span>, <span class="string">b'z'</span>)]; |
| <span class="macro">assert_eq!</span>(expected, branges(<span class="kw-2">&</span>cls)); |
| |
| <span class="kw">let </span>cls = bclass(<span class="kw-2">&</span>[(<span class="string">b'x'</span>, <span class="string">b'z'</span>), (<span class="string">b'a'</span>, <span class="string">b'c'</span>)]); |
| <span class="kw">let </span>expected = <span class="macro">vec!</span>[(<span class="string">b'a'</span>, <span class="string">b'c'</span>), (<span class="string">b'x'</span>, <span class="string">b'z'</span>)]; |
| <span class="macro">assert_eq!</span>(expected, branges(<span class="kw-2">&</span>cls)); |
| |
| <span class="kw">let </span>cls = bclass(<span class="kw-2">&</span>[(<span class="string">b'x'</span>, <span class="string">b'z'</span>), (<span class="string">b'w'</span>, <span class="string">b'y'</span>)]); |
| <span class="kw">let </span>expected = <span class="macro">vec!</span>[(<span class="string">b'w'</span>, <span class="string">b'z'</span>)]; |
| <span class="macro">assert_eq!</span>(expected, branges(<span class="kw-2">&</span>cls)); |
| |
| <span class="kw">let </span>cls = bclass(<span class="kw-2">&</span>[ |
| (<span class="string">b'c'</span>, <span class="string">b'f'</span>), |
| (<span class="string">b'a'</span>, <span class="string">b'g'</span>), |
| (<span class="string">b'd'</span>, <span class="string">b'j'</span>), |
| (<span class="string">b'a'</span>, <span class="string">b'c'</span>), |
| (<span class="string">b'm'</span>, <span class="string">b'p'</span>), |
| (<span class="string">b'l'</span>, <span class="string">b's'</span>), |
| ]); |
| <span class="kw">let </span>expected = <span class="macro">vec!</span>[(<span class="string">b'a'</span>, <span class="string">b'j'</span>), (<span class="string">b'l'</span>, <span class="string">b's'</span>)]; |
| <span class="macro">assert_eq!</span>(expected, branges(<span class="kw-2">&</span>cls)); |
| |
| <span class="kw">let </span>cls = bclass(<span class="kw-2">&</span>[(<span class="string">b'x'</span>, <span class="string">b'z'</span>), (<span class="string">b'u'</span>, <span class="string">b'w'</span>)]); |
| <span class="kw">let </span>expected = <span class="macro">vec!</span>[(<span class="string">b'u'</span>, <span class="string">b'z'</span>)]; |
| <span class="macro">assert_eq!</span>(expected, branges(<span class="kw-2">&</span>cls)); |
| |
| <span class="kw">let </span>cls = bclass(<span class="kw-2">&</span>[(<span class="string">b'\x00'</span>, <span class="string">b'\xFF'</span>), (<span class="string">b'\x00'</span>, <span class="string">b'\xFF'</span>)]); |
| <span class="kw">let </span>expected = <span class="macro">vec!</span>[(<span class="string">b'\x00'</span>, <span class="string">b'\xFF'</span>)]; |
| <span class="macro">assert_eq!</span>(expected, branges(<span class="kw-2">&</span>cls)); |
| |
| <span class="kw">let </span>cls = bclass(<span class="kw-2">&</span>[(<span class="string">b'a'</span>, <span class="string">b'a'</span>), (<span class="string">b'b'</span>, <span class="string">b'b'</span>)]); |
| <span class="kw">let </span>expected = <span class="macro">vec!</span>[(<span class="string">b'a'</span>, <span class="string">b'b'</span>)]; |
| <span class="macro">assert_eq!</span>(expected, branges(<span class="kw-2">&</span>cls)); |
| } |
| |
| <span class="attribute">#[test] |
| #[cfg(feature = <span class="string">"unicode-case"</span>)] |
| </span><span class="kw">fn </span>class_case_fold_unicode() { |
| <span class="kw">let </span>cls = uclass(<span class="kw-2">&</span>[ |
| (<span class="string">'C'</span>, <span class="string">'F'</span>), |
| (<span class="string">'A'</span>, <span class="string">'G'</span>), |
| (<span class="string">'D'</span>, <span class="string">'J'</span>), |
| (<span class="string">'A'</span>, <span class="string">'C'</span>), |
| (<span class="string">'M'</span>, <span class="string">'P'</span>), |
| (<span class="string">'L'</span>, <span class="string">'S'</span>), |
| (<span class="string">'c'</span>, <span class="string">'f'</span>), |
| ]); |
| <span class="kw">let </span>expected = uclass(<span class="kw-2">&</span>[ |
| (<span class="string">'A'</span>, <span class="string">'J'</span>), |
| (<span class="string">'L'</span>, <span class="string">'S'</span>), |
| (<span class="string">'a'</span>, <span class="string">'j'</span>), |
| (<span class="string">'l'</span>, <span class="string">'s'</span>), |
| (<span class="string">'\u{17F}'</span>, <span class="string">'\u{17F}'</span>), |
| ]); |
| <span class="macro">assert_eq!</span>(expected, ucasefold(<span class="kw-2">&</span>cls)); |
| |
| <span class="kw">let </span>cls = uclass(<span class="kw-2">&</span>[(<span class="string">'A'</span>, <span class="string">'Z'</span>)]); |
| <span class="kw">let </span>expected = uclass(<span class="kw-2">&</span>[ |
| (<span class="string">'A'</span>, <span class="string">'Z'</span>), |
| (<span class="string">'a'</span>, <span class="string">'z'</span>), |
| (<span class="string">'\u{17F}'</span>, <span class="string">'\u{17F}'</span>), |
| (<span class="string">'\u{212A}'</span>, <span class="string">'\u{212A}'</span>), |
| ]); |
| <span class="macro">assert_eq!</span>(expected, ucasefold(<span class="kw-2">&</span>cls)); |
| |
| <span class="kw">let </span>cls = uclass(<span class="kw-2">&</span>[(<span class="string">'a'</span>, <span class="string">'z'</span>)]); |
| <span class="kw">let </span>expected = uclass(<span class="kw-2">&</span>[ |
| (<span class="string">'A'</span>, <span class="string">'Z'</span>), |
| (<span class="string">'a'</span>, <span class="string">'z'</span>), |
| (<span class="string">'\u{17F}'</span>, <span class="string">'\u{17F}'</span>), |
| (<span class="string">'\u{212A}'</span>, <span class="string">'\u{212A}'</span>), |
| ]); |
| <span class="macro">assert_eq!</span>(expected, ucasefold(<span class="kw-2">&</span>cls)); |
| |
| <span class="kw">let </span>cls = uclass(<span class="kw-2">&</span>[(<span class="string">'A'</span>, <span class="string">'A'</span>), (<span class="string">'_'</span>, <span class="string">'_'</span>)]); |
| <span class="kw">let </span>expected = uclass(<span class="kw-2">&</span>[(<span class="string">'A'</span>, <span class="string">'A'</span>), (<span class="string">'_'</span>, <span class="string">'_'</span>), (<span class="string">'a'</span>, <span class="string">'a'</span>)]); |
| <span class="macro">assert_eq!</span>(expected, ucasefold(<span class="kw-2">&</span>cls)); |
| |
| <span class="kw">let </span>cls = uclass(<span class="kw-2">&</span>[(<span class="string">'A'</span>, <span class="string">'A'</span>), (<span class="string">'='</span>, <span class="string">'='</span>)]); |
| <span class="kw">let </span>expected = uclass(<span class="kw-2">&</span>[(<span class="string">'='</span>, <span class="string">'='</span>), (<span class="string">'A'</span>, <span class="string">'A'</span>), (<span class="string">'a'</span>, <span class="string">'a'</span>)]); |
| <span class="macro">assert_eq!</span>(expected, ucasefold(<span class="kw-2">&</span>cls)); |
| |
| <span class="kw">let </span>cls = uclass(<span class="kw-2">&</span>[(<span class="string">'\x00'</span>, <span class="string">'\x10'</span>)]); |
| <span class="macro">assert_eq!</span>(cls, ucasefold(<span class="kw-2">&</span>cls)); |
| |
| <span class="kw">let </span>cls = uclass(<span class="kw-2">&</span>[(<span class="string">'k'</span>, <span class="string">'k'</span>)]); |
| <span class="kw">let </span>expected = |
| uclass(<span class="kw-2">&</span>[(<span class="string">'K'</span>, <span class="string">'K'</span>), (<span class="string">'k'</span>, <span class="string">'k'</span>), (<span class="string">'\u{212A}'</span>, <span class="string">'\u{212A}'</span>)]); |
| <span class="macro">assert_eq!</span>(expected, ucasefold(<span class="kw-2">&</span>cls)); |
| |
| <span class="kw">let </span>cls = uclass(<span class="kw-2">&</span>[(<span class="string">'@'</span>, <span class="string">'@'</span>)]); |
| <span class="macro">assert_eq!</span>(cls, ucasefold(<span class="kw-2">&</span>cls)); |
| } |
| |
| <span class="attribute">#[test] |
| #[cfg(not(feature = <span class="string">"unicode-case"</span>))] |
| </span><span class="kw">fn </span>class_case_fold_unicode_disabled() { |
| <span class="kw">let </span><span class="kw-2">mut </span>cls = uclass(<span class="kw-2">&</span>[ |
| (<span class="string">'C'</span>, <span class="string">'F'</span>), |
| (<span class="string">'A'</span>, <span class="string">'G'</span>), |
| (<span class="string">'D'</span>, <span class="string">'J'</span>), |
| (<span class="string">'A'</span>, <span class="string">'C'</span>), |
| (<span class="string">'M'</span>, <span class="string">'P'</span>), |
| (<span class="string">'L'</span>, <span class="string">'S'</span>), |
| (<span class="string">'c'</span>, <span class="string">'f'</span>), |
| ]); |
| <span class="macro">assert!</span>(cls.try_case_fold_simple().is_err()); |
| } |
| |
| <span class="attribute">#[test] |
| #[should_panic] |
| #[cfg(not(feature = <span class="string">"unicode-case"</span>))] |
| </span><span class="kw">fn </span>class_case_fold_unicode_disabled_panics() { |
| <span class="kw">let </span><span class="kw-2">mut </span>cls = uclass(<span class="kw-2">&</span>[ |
| (<span class="string">'C'</span>, <span class="string">'F'</span>), |
| (<span class="string">'A'</span>, <span class="string">'G'</span>), |
| (<span class="string">'D'</span>, <span class="string">'J'</span>), |
| (<span class="string">'A'</span>, <span class="string">'C'</span>), |
| (<span class="string">'M'</span>, <span class="string">'P'</span>), |
| (<span class="string">'L'</span>, <span class="string">'S'</span>), |
| (<span class="string">'c'</span>, <span class="string">'f'</span>), |
| ]); |
| cls.case_fold_simple(); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>class_case_fold_bytes() { |
| <span class="kw">let </span>cls = bclass(<span class="kw-2">&</span>[ |
| (<span class="string">b'C'</span>, <span class="string">b'F'</span>), |
| (<span class="string">b'A'</span>, <span class="string">b'G'</span>), |
| (<span class="string">b'D'</span>, <span class="string">b'J'</span>), |
| (<span class="string">b'A'</span>, <span class="string">b'C'</span>), |
| (<span class="string">b'M'</span>, <span class="string">b'P'</span>), |
| (<span class="string">b'L'</span>, <span class="string">b'S'</span>), |
| (<span class="string">b'c'</span>, <span class="string">b'f'</span>), |
| ]); |
| <span class="kw">let </span>expected = |
| bclass(<span class="kw-2">&</span>[(<span class="string">b'A'</span>, <span class="string">b'J'</span>), (<span class="string">b'L'</span>, <span class="string">b'S'</span>), (<span class="string">b'a'</span>, <span class="string">b'j'</span>), (<span class="string">b'l'</span>, <span class="string">b's'</span>)]); |
| <span class="macro">assert_eq!</span>(expected, bcasefold(<span class="kw-2">&</span>cls)); |
| |
| <span class="kw">let </span>cls = bclass(<span class="kw-2">&</span>[(<span class="string">b'A'</span>, <span class="string">b'Z'</span>)]); |
| <span class="kw">let </span>expected = bclass(<span class="kw-2">&</span>[(<span class="string">b'A'</span>, <span class="string">b'Z'</span>), (<span class="string">b'a'</span>, <span class="string">b'z'</span>)]); |
| <span class="macro">assert_eq!</span>(expected, bcasefold(<span class="kw-2">&</span>cls)); |
| |
| <span class="kw">let </span>cls = bclass(<span class="kw-2">&</span>[(<span class="string">b'a'</span>, <span class="string">b'z'</span>)]); |
| <span class="kw">let </span>expected = bclass(<span class="kw-2">&</span>[(<span class="string">b'A'</span>, <span class="string">b'Z'</span>), (<span class="string">b'a'</span>, <span class="string">b'z'</span>)]); |
| <span class="macro">assert_eq!</span>(expected, bcasefold(<span class="kw-2">&</span>cls)); |
| |
| <span class="kw">let </span>cls = bclass(<span class="kw-2">&</span>[(<span class="string">b'A'</span>, <span class="string">b'A'</span>), (<span class="string">b'_'</span>, <span class="string">b'_'</span>)]); |
| <span class="kw">let </span>expected = bclass(<span class="kw-2">&</span>[(<span class="string">b'A'</span>, <span class="string">b'A'</span>), (<span class="string">b'_'</span>, <span class="string">b'_'</span>), (<span class="string">b'a'</span>, <span class="string">b'a'</span>)]); |
| <span class="macro">assert_eq!</span>(expected, bcasefold(<span class="kw-2">&</span>cls)); |
| |
| <span class="kw">let </span>cls = bclass(<span class="kw-2">&</span>[(<span class="string">b'A'</span>, <span class="string">b'A'</span>), (<span class="string">b'='</span>, <span class="string">b'='</span>)]); |
| <span class="kw">let </span>expected = bclass(<span class="kw-2">&</span>[(<span class="string">b'='</span>, <span class="string">b'='</span>), (<span class="string">b'A'</span>, <span class="string">b'A'</span>), (<span class="string">b'a'</span>, <span class="string">b'a'</span>)]); |
| <span class="macro">assert_eq!</span>(expected, bcasefold(<span class="kw-2">&</span>cls)); |
| |
| <span class="kw">let </span>cls = bclass(<span class="kw-2">&</span>[(<span class="string">b'\x00'</span>, <span class="string">b'\x10'</span>)]); |
| <span class="macro">assert_eq!</span>(cls, bcasefold(<span class="kw-2">&</span>cls)); |
| |
| <span class="kw">let </span>cls = bclass(<span class="kw-2">&</span>[(<span class="string">b'k'</span>, <span class="string">b'k'</span>)]); |
| <span class="kw">let </span>expected = bclass(<span class="kw-2">&</span>[(<span class="string">b'K'</span>, <span class="string">b'K'</span>), (<span class="string">b'k'</span>, <span class="string">b'k'</span>)]); |
| <span class="macro">assert_eq!</span>(expected, bcasefold(<span class="kw-2">&</span>cls)); |
| |
| <span class="kw">let </span>cls = bclass(<span class="kw-2">&</span>[(<span class="string">b'@'</span>, <span class="string">b'@'</span>)]); |
| <span class="macro">assert_eq!</span>(cls, bcasefold(<span class="kw-2">&</span>cls)); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>class_negate_unicode() { |
| <span class="kw">let </span>cls = uclass(<span class="kw-2">&</span>[(<span class="string">'a'</span>, <span class="string">'a'</span>)]); |
| <span class="kw">let </span>expected = uclass(<span class="kw-2">&</span>[(<span class="string">'\x00'</span>, <span class="string">'\x60'</span>), (<span class="string">'\x62'</span>, <span class="string">'\u{10FFFF}'</span>)]); |
| <span class="macro">assert_eq!</span>(expected, unegate(<span class="kw-2">&</span>cls)); |
| |
| <span class="kw">let </span>cls = uclass(<span class="kw-2">&</span>[(<span class="string">'a'</span>, <span class="string">'a'</span>), (<span class="string">'b'</span>, <span class="string">'b'</span>)]); |
| <span class="kw">let </span>expected = uclass(<span class="kw-2">&</span>[(<span class="string">'\x00'</span>, <span class="string">'\x60'</span>), (<span class="string">'\x63'</span>, <span class="string">'\u{10FFFF}'</span>)]); |
| <span class="macro">assert_eq!</span>(expected, unegate(<span class="kw-2">&</span>cls)); |
| |
| <span class="kw">let </span>cls = uclass(<span class="kw-2">&</span>[(<span class="string">'a'</span>, <span class="string">'c'</span>), (<span class="string">'x'</span>, <span class="string">'z'</span>)]); |
| <span class="kw">let </span>expected = uclass(<span class="kw-2">&</span>[ |
| (<span class="string">'\x00'</span>, <span class="string">'\x60'</span>), |
| (<span class="string">'\x64'</span>, <span class="string">'\x77'</span>), |
| (<span class="string">'\x7B'</span>, <span class="string">'\u{10FFFF}'</span>), |
| ]); |
| <span class="macro">assert_eq!</span>(expected, unegate(<span class="kw-2">&</span>cls)); |
| |
| <span class="kw">let </span>cls = uclass(<span class="kw-2">&</span>[(<span class="string">'\x00'</span>, <span class="string">'a'</span>)]); |
| <span class="kw">let </span>expected = uclass(<span class="kw-2">&</span>[(<span class="string">'\x62'</span>, <span class="string">'\u{10FFFF}'</span>)]); |
| <span class="macro">assert_eq!</span>(expected, unegate(<span class="kw-2">&</span>cls)); |
| |
| <span class="kw">let </span>cls = uclass(<span class="kw-2">&</span>[(<span class="string">'a'</span>, <span class="string">'\u{10FFFF}'</span>)]); |
| <span class="kw">let </span>expected = uclass(<span class="kw-2">&</span>[(<span class="string">'\x00'</span>, <span class="string">'\x60'</span>)]); |
| <span class="macro">assert_eq!</span>(expected, unegate(<span class="kw-2">&</span>cls)); |
| |
| <span class="kw">let </span>cls = uclass(<span class="kw-2">&</span>[(<span class="string">'\x00'</span>, <span class="string">'\u{10FFFF}'</span>)]); |
| <span class="kw">let </span>expected = uclass(<span class="kw-2">&</span>[]); |
| <span class="macro">assert_eq!</span>(expected, unegate(<span class="kw-2">&</span>cls)); |
| |
| <span class="kw">let </span>cls = uclass(<span class="kw-2">&</span>[]); |
| <span class="kw">let </span>expected = uclass(<span class="kw-2">&</span>[(<span class="string">'\x00'</span>, <span class="string">'\u{10FFFF}'</span>)]); |
| <span class="macro">assert_eq!</span>(expected, unegate(<span class="kw-2">&</span>cls)); |
| |
| <span class="kw">let </span>cls = |
| uclass(<span class="kw-2">&</span>[(<span class="string">'\x00'</span>, <span class="string">'\u{10FFFD}'</span>), (<span class="string">'\u{10FFFF}'</span>, <span class="string">'\u{10FFFF}'</span>)]); |
| <span class="kw">let </span>expected = uclass(<span class="kw-2">&</span>[(<span class="string">'\u{10FFFE}'</span>, <span class="string">'\u{10FFFE}'</span>)]); |
| <span class="macro">assert_eq!</span>(expected, unegate(<span class="kw-2">&</span>cls)); |
| |
| <span class="kw">let </span>cls = uclass(<span class="kw-2">&</span>[(<span class="string">'\x00'</span>, <span class="string">'\u{D7FF}'</span>)]); |
| <span class="kw">let </span>expected = uclass(<span class="kw-2">&</span>[(<span class="string">'\u{E000}'</span>, <span class="string">'\u{10FFFF}'</span>)]); |
| <span class="macro">assert_eq!</span>(expected, unegate(<span class="kw-2">&</span>cls)); |
| |
| <span class="kw">let </span>cls = uclass(<span class="kw-2">&</span>[(<span class="string">'\x00'</span>, <span class="string">'\u{D7FE}'</span>)]); |
| <span class="kw">let </span>expected = uclass(<span class="kw-2">&</span>[(<span class="string">'\u{D7FF}'</span>, <span class="string">'\u{10FFFF}'</span>)]); |
| <span class="macro">assert_eq!</span>(expected, unegate(<span class="kw-2">&</span>cls)); |
| |
| <span class="kw">let </span>cls = uclass(<span class="kw-2">&</span>[(<span class="string">'\u{E000}'</span>, <span class="string">'\u{10FFFF}'</span>)]); |
| <span class="kw">let </span>expected = uclass(<span class="kw-2">&</span>[(<span class="string">'\x00'</span>, <span class="string">'\u{D7FF}'</span>)]); |
| <span class="macro">assert_eq!</span>(expected, unegate(<span class="kw-2">&</span>cls)); |
| |
| <span class="kw">let </span>cls = uclass(<span class="kw-2">&</span>[(<span class="string">'\u{E001}'</span>, <span class="string">'\u{10FFFF}'</span>)]); |
| <span class="kw">let </span>expected = uclass(<span class="kw-2">&</span>[(<span class="string">'\x00'</span>, <span class="string">'\u{E000}'</span>)]); |
| <span class="macro">assert_eq!</span>(expected, unegate(<span class="kw-2">&</span>cls)); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>class_negate_bytes() { |
| <span class="kw">let </span>cls = bclass(<span class="kw-2">&</span>[(<span class="string">b'a'</span>, <span class="string">b'a'</span>)]); |
| <span class="kw">let </span>expected = bclass(<span class="kw-2">&</span>[(<span class="string">b'\x00'</span>, <span class="string">b'\x60'</span>), (<span class="string">b'\x62'</span>, <span class="string">b'\xFF'</span>)]); |
| <span class="macro">assert_eq!</span>(expected, bnegate(<span class="kw-2">&</span>cls)); |
| |
| <span class="kw">let </span>cls = bclass(<span class="kw-2">&</span>[(<span class="string">b'a'</span>, <span class="string">b'a'</span>), (<span class="string">b'b'</span>, <span class="string">b'b'</span>)]); |
| <span class="kw">let </span>expected = bclass(<span class="kw-2">&</span>[(<span class="string">b'\x00'</span>, <span class="string">b'\x60'</span>), (<span class="string">b'\x63'</span>, <span class="string">b'\xFF'</span>)]); |
| <span class="macro">assert_eq!</span>(expected, bnegate(<span class="kw-2">&</span>cls)); |
| |
| <span class="kw">let </span>cls = bclass(<span class="kw-2">&</span>[(<span class="string">b'a'</span>, <span class="string">b'c'</span>), (<span class="string">b'x'</span>, <span class="string">b'z'</span>)]); |
| <span class="kw">let </span>expected = bclass(<span class="kw-2">&</span>[ |
| (<span class="string">b'\x00'</span>, <span class="string">b'\x60'</span>), |
| (<span class="string">b'\x64'</span>, <span class="string">b'\x77'</span>), |
| (<span class="string">b'\x7B'</span>, <span class="string">b'\xFF'</span>), |
| ]); |
| <span class="macro">assert_eq!</span>(expected, bnegate(<span class="kw-2">&</span>cls)); |
| |
| <span class="kw">let </span>cls = bclass(<span class="kw-2">&</span>[(<span class="string">b'\x00'</span>, <span class="string">b'a'</span>)]); |
| <span class="kw">let </span>expected = bclass(<span class="kw-2">&</span>[(<span class="string">b'\x62'</span>, <span class="string">b'\xFF'</span>)]); |
| <span class="macro">assert_eq!</span>(expected, bnegate(<span class="kw-2">&</span>cls)); |
| |
| <span class="kw">let </span>cls = bclass(<span class="kw-2">&</span>[(<span class="string">b'a'</span>, <span class="string">b'\xFF'</span>)]); |
| <span class="kw">let </span>expected = bclass(<span class="kw-2">&</span>[(<span class="string">b'\x00'</span>, <span class="string">b'\x60'</span>)]); |
| <span class="macro">assert_eq!</span>(expected, bnegate(<span class="kw-2">&</span>cls)); |
| |
| <span class="kw">let </span>cls = bclass(<span class="kw-2">&</span>[(<span class="string">b'\x00'</span>, <span class="string">b'\xFF'</span>)]); |
| <span class="kw">let </span>expected = bclass(<span class="kw-2">&</span>[]); |
| <span class="macro">assert_eq!</span>(expected, bnegate(<span class="kw-2">&</span>cls)); |
| |
| <span class="kw">let </span>cls = bclass(<span class="kw-2">&</span>[]); |
| <span class="kw">let </span>expected = bclass(<span class="kw-2">&</span>[(<span class="string">b'\x00'</span>, <span class="string">b'\xFF'</span>)]); |
| <span class="macro">assert_eq!</span>(expected, bnegate(<span class="kw-2">&</span>cls)); |
| |
| <span class="kw">let </span>cls = bclass(<span class="kw-2">&</span>[(<span class="string">b'\x00'</span>, <span class="string">b'\xFD'</span>), (<span class="string">b'\xFF'</span>, <span class="string">b'\xFF'</span>)]); |
| <span class="kw">let </span>expected = bclass(<span class="kw-2">&</span>[(<span class="string">b'\xFE'</span>, <span class="string">b'\xFE'</span>)]); |
| <span class="macro">assert_eq!</span>(expected, bnegate(<span class="kw-2">&</span>cls)); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>class_union_unicode() { |
| <span class="kw">let </span>cls1 = uclass(<span class="kw-2">&</span>[(<span class="string">'a'</span>, <span class="string">'g'</span>), (<span class="string">'m'</span>, <span class="string">'t'</span>), (<span class="string">'A'</span>, <span class="string">'C'</span>)]); |
| <span class="kw">let </span>cls2 = uclass(<span class="kw-2">&</span>[(<span class="string">'a'</span>, <span class="string">'z'</span>)]); |
| <span class="kw">let </span>expected = uclass(<span class="kw-2">&</span>[(<span class="string">'a'</span>, <span class="string">'z'</span>), (<span class="string">'A'</span>, <span class="string">'C'</span>)]); |
| <span class="macro">assert_eq!</span>(expected, uunion(<span class="kw-2">&</span>cls1, <span class="kw-2">&</span>cls2)); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>class_union_bytes() { |
| <span class="kw">let </span>cls1 = bclass(<span class="kw-2">&</span>[(<span class="string">b'a'</span>, <span class="string">b'g'</span>), (<span class="string">b'm'</span>, <span class="string">b't'</span>), (<span class="string">b'A'</span>, <span class="string">b'C'</span>)]); |
| <span class="kw">let </span>cls2 = bclass(<span class="kw-2">&</span>[(<span class="string">b'a'</span>, <span class="string">b'z'</span>)]); |
| <span class="kw">let </span>expected = bclass(<span class="kw-2">&</span>[(<span class="string">b'a'</span>, <span class="string">b'z'</span>), (<span class="string">b'A'</span>, <span class="string">b'C'</span>)]); |
| <span class="macro">assert_eq!</span>(expected, bunion(<span class="kw-2">&</span>cls1, <span class="kw-2">&</span>cls2)); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>class_intersect_unicode() { |
| <span class="kw">let </span>cls1 = uclass(<span class="kw-2">&</span>[]); |
| <span class="kw">let </span>cls2 = uclass(<span class="kw-2">&</span>[(<span class="string">'a'</span>, <span class="string">'a'</span>)]); |
| <span class="kw">let </span>expected = uclass(<span class="kw-2">&</span>[]); |
| <span class="macro">assert_eq!</span>(expected, uintersect(<span class="kw-2">&</span>cls1, <span class="kw-2">&</span>cls2)); |
| |
| <span class="kw">let </span>cls1 = uclass(<span class="kw-2">&</span>[(<span class="string">'a'</span>, <span class="string">'a'</span>)]); |
| <span class="kw">let </span>cls2 = uclass(<span class="kw-2">&</span>[(<span class="string">'a'</span>, <span class="string">'a'</span>)]); |
| <span class="kw">let </span>expected = uclass(<span class="kw-2">&</span>[(<span class="string">'a'</span>, <span class="string">'a'</span>)]); |
| <span class="macro">assert_eq!</span>(expected, uintersect(<span class="kw-2">&</span>cls1, <span class="kw-2">&</span>cls2)); |
| |
| <span class="kw">let </span>cls1 = uclass(<span class="kw-2">&</span>[(<span class="string">'a'</span>, <span class="string">'a'</span>)]); |
| <span class="kw">let </span>cls2 = uclass(<span class="kw-2">&</span>[(<span class="string">'b'</span>, <span class="string">'b'</span>)]); |
| <span class="kw">let </span>expected = uclass(<span class="kw-2">&</span>[]); |
| <span class="macro">assert_eq!</span>(expected, uintersect(<span class="kw-2">&</span>cls1, <span class="kw-2">&</span>cls2)); |
| |
| <span class="kw">let </span>cls1 = uclass(<span class="kw-2">&</span>[(<span class="string">'a'</span>, <span class="string">'a'</span>)]); |
| <span class="kw">let </span>cls2 = uclass(<span class="kw-2">&</span>[(<span class="string">'a'</span>, <span class="string">'c'</span>)]); |
| <span class="kw">let </span>expected = uclass(<span class="kw-2">&</span>[(<span class="string">'a'</span>, <span class="string">'a'</span>)]); |
| <span class="macro">assert_eq!</span>(expected, uintersect(<span class="kw-2">&</span>cls1, <span class="kw-2">&</span>cls2)); |
| |
| <span class="kw">let </span>cls1 = uclass(<span class="kw-2">&</span>[(<span class="string">'a'</span>, <span class="string">'b'</span>)]); |
| <span class="kw">let </span>cls2 = uclass(<span class="kw-2">&</span>[(<span class="string">'a'</span>, <span class="string">'c'</span>)]); |
| <span class="kw">let </span>expected = uclass(<span class="kw-2">&</span>[(<span class="string">'a'</span>, <span class="string">'b'</span>)]); |
| <span class="macro">assert_eq!</span>(expected, uintersect(<span class="kw-2">&</span>cls1, <span class="kw-2">&</span>cls2)); |
| |
| <span class="kw">let </span>cls1 = uclass(<span class="kw-2">&</span>[(<span class="string">'a'</span>, <span class="string">'b'</span>)]); |
| <span class="kw">let </span>cls2 = uclass(<span class="kw-2">&</span>[(<span class="string">'b'</span>, <span class="string">'c'</span>)]); |
| <span class="kw">let </span>expected = uclass(<span class="kw-2">&</span>[(<span class="string">'b'</span>, <span class="string">'b'</span>)]); |
| <span class="macro">assert_eq!</span>(expected, uintersect(<span class="kw-2">&</span>cls1, <span class="kw-2">&</span>cls2)); |
| |
| <span class="kw">let </span>cls1 = uclass(<span class="kw-2">&</span>[(<span class="string">'a'</span>, <span class="string">'b'</span>)]); |
| <span class="kw">let </span>cls2 = uclass(<span class="kw-2">&</span>[(<span class="string">'c'</span>, <span class="string">'d'</span>)]); |
| <span class="kw">let </span>expected = uclass(<span class="kw-2">&</span>[]); |
| <span class="macro">assert_eq!</span>(expected, uintersect(<span class="kw-2">&</span>cls1, <span class="kw-2">&</span>cls2)); |
| |
| <span class="kw">let </span>cls1 = uclass(<span class="kw-2">&</span>[(<span class="string">'b'</span>, <span class="string">'c'</span>)]); |
| <span class="kw">let </span>cls2 = uclass(<span class="kw-2">&</span>[(<span class="string">'a'</span>, <span class="string">'d'</span>)]); |
| <span class="kw">let </span>expected = uclass(<span class="kw-2">&</span>[(<span class="string">'b'</span>, <span class="string">'c'</span>)]); |
| <span class="macro">assert_eq!</span>(expected, uintersect(<span class="kw-2">&</span>cls1, <span class="kw-2">&</span>cls2)); |
| |
| <span class="kw">let </span>cls1 = uclass(<span class="kw-2">&</span>[(<span class="string">'a'</span>, <span class="string">'b'</span>), (<span class="string">'d'</span>, <span class="string">'e'</span>), (<span class="string">'g'</span>, <span class="string">'h'</span>)]); |
| <span class="kw">let </span>cls2 = uclass(<span class="kw-2">&</span>[(<span class="string">'a'</span>, <span class="string">'h'</span>)]); |
| <span class="kw">let </span>expected = uclass(<span class="kw-2">&</span>[(<span class="string">'a'</span>, <span class="string">'b'</span>), (<span class="string">'d'</span>, <span class="string">'e'</span>), (<span class="string">'g'</span>, <span class="string">'h'</span>)]); |
| <span class="macro">assert_eq!</span>(expected, uintersect(<span class="kw-2">&</span>cls1, <span class="kw-2">&</span>cls2)); |
| |
| <span class="kw">let </span>cls1 = uclass(<span class="kw-2">&</span>[(<span class="string">'a'</span>, <span class="string">'b'</span>), (<span class="string">'d'</span>, <span class="string">'e'</span>), (<span class="string">'g'</span>, <span class="string">'h'</span>)]); |
| <span class="kw">let </span>cls2 = uclass(<span class="kw-2">&</span>[(<span class="string">'a'</span>, <span class="string">'b'</span>), (<span class="string">'d'</span>, <span class="string">'e'</span>), (<span class="string">'g'</span>, <span class="string">'h'</span>)]); |
| <span class="kw">let </span>expected = uclass(<span class="kw-2">&</span>[(<span class="string">'a'</span>, <span class="string">'b'</span>), (<span class="string">'d'</span>, <span class="string">'e'</span>), (<span class="string">'g'</span>, <span class="string">'h'</span>)]); |
| <span class="macro">assert_eq!</span>(expected, uintersect(<span class="kw-2">&</span>cls1, <span class="kw-2">&</span>cls2)); |
| |
| <span class="kw">let </span>cls1 = uclass(<span class="kw-2">&</span>[(<span class="string">'a'</span>, <span class="string">'b'</span>), (<span class="string">'g'</span>, <span class="string">'h'</span>)]); |
| <span class="kw">let </span>cls2 = uclass(<span class="kw-2">&</span>[(<span class="string">'d'</span>, <span class="string">'e'</span>), (<span class="string">'k'</span>, <span class="string">'l'</span>)]); |
| <span class="kw">let </span>expected = uclass(<span class="kw-2">&</span>[]); |
| <span class="macro">assert_eq!</span>(expected, uintersect(<span class="kw-2">&</span>cls1, <span class="kw-2">&</span>cls2)); |
| |
| <span class="kw">let </span>cls1 = uclass(<span class="kw-2">&</span>[(<span class="string">'a'</span>, <span class="string">'b'</span>), (<span class="string">'d'</span>, <span class="string">'e'</span>), (<span class="string">'g'</span>, <span class="string">'h'</span>)]); |
| <span class="kw">let </span>cls2 = uclass(<span class="kw-2">&</span>[(<span class="string">'h'</span>, <span class="string">'h'</span>)]); |
| <span class="kw">let </span>expected = uclass(<span class="kw-2">&</span>[(<span class="string">'h'</span>, <span class="string">'h'</span>)]); |
| <span class="macro">assert_eq!</span>(expected, uintersect(<span class="kw-2">&</span>cls1, <span class="kw-2">&</span>cls2)); |
| |
| <span class="kw">let </span>cls1 = uclass(<span class="kw-2">&</span>[(<span class="string">'a'</span>, <span class="string">'b'</span>), (<span class="string">'e'</span>, <span class="string">'f'</span>), (<span class="string">'i'</span>, <span class="string">'j'</span>)]); |
| <span class="kw">let </span>cls2 = uclass(<span class="kw-2">&</span>[(<span class="string">'c'</span>, <span class="string">'d'</span>), (<span class="string">'g'</span>, <span class="string">'h'</span>), (<span class="string">'k'</span>, <span class="string">'l'</span>)]); |
| <span class="kw">let </span>expected = uclass(<span class="kw-2">&</span>[]); |
| <span class="macro">assert_eq!</span>(expected, uintersect(<span class="kw-2">&</span>cls1, <span class="kw-2">&</span>cls2)); |
| |
| <span class="kw">let </span>cls1 = uclass(<span class="kw-2">&</span>[(<span class="string">'a'</span>, <span class="string">'b'</span>), (<span class="string">'c'</span>, <span class="string">'d'</span>), (<span class="string">'e'</span>, <span class="string">'f'</span>)]); |
| <span class="kw">let </span>cls2 = uclass(<span class="kw-2">&</span>[(<span class="string">'b'</span>, <span class="string">'c'</span>), (<span class="string">'d'</span>, <span class="string">'e'</span>), (<span class="string">'f'</span>, <span class="string">'g'</span>)]); |
| <span class="kw">let </span>expected = uclass(<span class="kw-2">&</span>[(<span class="string">'b'</span>, <span class="string">'f'</span>)]); |
| <span class="macro">assert_eq!</span>(expected, uintersect(<span class="kw-2">&</span>cls1, <span class="kw-2">&</span>cls2)); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>class_intersect_bytes() { |
| <span class="kw">let </span>cls1 = bclass(<span class="kw-2">&</span>[]); |
| <span class="kw">let </span>cls2 = bclass(<span class="kw-2">&</span>[(<span class="string">b'a'</span>, <span class="string">b'a'</span>)]); |
| <span class="kw">let </span>expected = bclass(<span class="kw-2">&</span>[]); |
| <span class="macro">assert_eq!</span>(expected, bintersect(<span class="kw-2">&</span>cls1, <span class="kw-2">&</span>cls2)); |
| |
| <span class="kw">let </span>cls1 = bclass(<span class="kw-2">&</span>[(<span class="string">b'a'</span>, <span class="string">b'a'</span>)]); |
| <span class="kw">let </span>cls2 = bclass(<span class="kw-2">&</span>[(<span class="string">b'a'</span>, <span class="string">b'a'</span>)]); |
| <span class="kw">let </span>expected = bclass(<span class="kw-2">&</span>[(<span class="string">b'a'</span>, <span class="string">b'a'</span>)]); |
| <span class="macro">assert_eq!</span>(expected, bintersect(<span class="kw-2">&</span>cls1, <span class="kw-2">&</span>cls2)); |
| |
| <span class="kw">let </span>cls1 = bclass(<span class="kw-2">&</span>[(<span class="string">b'a'</span>, <span class="string">b'a'</span>)]); |
| <span class="kw">let </span>cls2 = bclass(<span class="kw-2">&</span>[(<span class="string">b'b'</span>, <span class="string">b'b'</span>)]); |
| <span class="kw">let </span>expected = bclass(<span class="kw-2">&</span>[]); |
| <span class="macro">assert_eq!</span>(expected, bintersect(<span class="kw-2">&</span>cls1, <span class="kw-2">&</span>cls2)); |
| |
| <span class="kw">let </span>cls1 = bclass(<span class="kw-2">&</span>[(<span class="string">b'a'</span>, <span class="string">b'a'</span>)]); |
| <span class="kw">let </span>cls2 = bclass(<span class="kw-2">&</span>[(<span class="string">b'a'</span>, <span class="string">b'c'</span>)]); |
| <span class="kw">let </span>expected = bclass(<span class="kw-2">&</span>[(<span class="string">b'a'</span>, <span class="string">b'a'</span>)]); |
| <span class="macro">assert_eq!</span>(expected, bintersect(<span class="kw-2">&</span>cls1, <span class="kw-2">&</span>cls2)); |
| |
| <span class="kw">let </span>cls1 = bclass(<span class="kw-2">&</span>[(<span class="string">b'a'</span>, <span class="string">b'b'</span>)]); |
| <span class="kw">let </span>cls2 = bclass(<span class="kw-2">&</span>[(<span class="string">b'a'</span>, <span class="string">b'c'</span>)]); |
| <span class="kw">let </span>expected = bclass(<span class="kw-2">&</span>[(<span class="string">b'a'</span>, <span class="string">b'b'</span>)]); |
| <span class="macro">assert_eq!</span>(expected, bintersect(<span class="kw-2">&</span>cls1, <span class="kw-2">&</span>cls2)); |
| |
| <span class="kw">let </span>cls1 = bclass(<span class="kw-2">&</span>[(<span class="string">b'a'</span>, <span class="string">b'b'</span>)]); |
| <span class="kw">let </span>cls2 = bclass(<span class="kw-2">&</span>[(<span class="string">b'b'</span>, <span class="string">b'c'</span>)]); |
| <span class="kw">let </span>expected = bclass(<span class="kw-2">&</span>[(<span class="string">b'b'</span>, <span class="string">b'b'</span>)]); |
| <span class="macro">assert_eq!</span>(expected, bintersect(<span class="kw-2">&</span>cls1, <span class="kw-2">&</span>cls2)); |
| |
| <span class="kw">let </span>cls1 = bclass(<span class="kw-2">&</span>[(<span class="string">b'a'</span>, <span class="string">b'b'</span>)]); |
| <span class="kw">let </span>cls2 = bclass(<span class="kw-2">&</span>[(<span class="string">b'c'</span>, <span class="string">b'd'</span>)]); |
| <span class="kw">let </span>expected = bclass(<span class="kw-2">&</span>[]); |
| <span class="macro">assert_eq!</span>(expected, bintersect(<span class="kw-2">&</span>cls1, <span class="kw-2">&</span>cls2)); |
| |
| <span class="kw">let </span>cls1 = bclass(<span class="kw-2">&</span>[(<span class="string">b'b'</span>, <span class="string">b'c'</span>)]); |
| <span class="kw">let </span>cls2 = bclass(<span class="kw-2">&</span>[(<span class="string">b'a'</span>, <span class="string">b'd'</span>)]); |
| <span class="kw">let </span>expected = bclass(<span class="kw-2">&</span>[(<span class="string">b'b'</span>, <span class="string">b'c'</span>)]); |
| <span class="macro">assert_eq!</span>(expected, bintersect(<span class="kw-2">&</span>cls1, <span class="kw-2">&</span>cls2)); |
| |
| <span class="kw">let </span>cls1 = bclass(<span class="kw-2">&</span>[(<span class="string">b'a'</span>, <span class="string">b'b'</span>), (<span class="string">b'd'</span>, <span class="string">b'e'</span>), (<span class="string">b'g'</span>, <span class="string">b'h'</span>)]); |
| <span class="kw">let </span>cls2 = bclass(<span class="kw-2">&</span>[(<span class="string">b'a'</span>, <span class="string">b'h'</span>)]); |
| <span class="kw">let </span>expected = bclass(<span class="kw-2">&</span>[(<span class="string">b'a'</span>, <span class="string">b'b'</span>), (<span class="string">b'd'</span>, <span class="string">b'e'</span>), (<span class="string">b'g'</span>, <span class="string">b'h'</span>)]); |
| <span class="macro">assert_eq!</span>(expected, bintersect(<span class="kw-2">&</span>cls1, <span class="kw-2">&</span>cls2)); |
| |
| <span class="kw">let </span>cls1 = bclass(<span class="kw-2">&</span>[(<span class="string">b'a'</span>, <span class="string">b'b'</span>), (<span class="string">b'd'</span>, <span class="string">b'e'</span>), (<span class="string">b'g'</span>, <span class="string">b'h'</span>)]); |
| <span class="kw">let </span>cls2 = bclass(<span class="kw-2">&</span>[(<span class="string">b'a'</span>, <span class="string">b'b'</span>), (<span class="string">b'd'</span>, <span class="string">b'e'</span>), (<span class="string">b'g'</span>, <span class="string">b'h'</span>)]); |
| <span class="kw">let </span>expected = bclass(<span class="kw-2">&</span>[(<span class="string">b'a'</span>, <span class="string">b'b'</span>), (<span class="string">b'd'</span>, <span class="string">b'e'</span>), (<span class="string">b'g'</span>, <span class="string">b'h'</span>)]); |
| <span class="macro">assert_eq!</span>(expected, bintersect(<span class="kw-2">&</span>cls1, <span class="kw-2">&</span>cls2)); |
| |
| <span class="kw">let </span>cls1 = bclass(<span class="kw-2">&</span>[(<span class="string">b'a'</span>, <span class="string">b'b'</span>), (<span class="string">b'g'</span>, <span class="string">b'h'</span>)]); |
| <span class="kw">let </span>cls2 = bclass(<span class="kw-2">&</span>[(<span class="string">b'd'</span>, <span class="string">b'e'</span>), (<span class="string">b'k'</span>, <span class="string">b'l'</span>)]); |
| <span class="kw">let </span>expected = bclass(<span class="kw-2">&</span>[]); |
| <span class="macro">assert_eq!</span>(expected, bintersect(<span class="kw-2">&</span>cls1, <span class="kw-2">&</span>cls2)); |
| |
| <span class="kw">let </span>cls1 = bclass(<span class="kw-2">&</span>[(<span class="string">b'a'</span>, <span class="string">b'b'</span>), (<span class="string">b'd'</span>, <span class="string">b'e'</span>), (<span class="string">b'g'</span>, <span class="string">b'h'</span>)]); |
| <span class="kw">let </span>cls2 = bclass(<span class="kw-2">&</span>[(<span class="string">b'h'</span>, <span class="string">b'h'</span>)]); |
| <span class="kw">let </span>expected = bclass(<span class="kw-2">&</span>[(<span class="string">b'h'</span>, <span class="string">b'h'</span>)]); |
| <span class="macro">assert_eq!</span>(expected, bintersect(<span class="kw-2">&</span>cls1, <span class="kw-2">&</span>cls2)); |
| |
| <span class="kw">let </span>cls1 = bclass(<span class="kw-2">&</span>[(<span class="string">b'a'</span>, <span class="string">b'b'</span>), (<span class="string">b'e'</span>, <span class="string">b'f'</span>), (<span class="string">b'i'</span>, <span class="string">b'j'</span>)]); |
| <span class="kw">let </span>cls2 = bclass(<span class="kw-2">&</span>[(<span class="string">b'c'</span>, <span class="string">b'd'</span>), (<span class="string">b'g'</span>, <span class="string">b'h'</span>), (<span class="string">b'k'</span>, <span class="string">b'l'</span>)]); |
| <span class="kw">let </span>expected = bclass(<span class="kw-2">&</span>[]); |
| <span class="macro">assert_eq!</span>(expected, bintersect(<span class="kw-2">&</span>cls1, <span class="kw-2">&</span>cls2)); |
| |
| <span class="kw">let </span>cls1 = bclass(<span class="kw-2">&</span>[(<span class="string">b'a'</span>, <span class="string">b'b'</span>), (<span class="string">b'c'</span>, <span class="string">b'd'</span>), (<span class="string">b'e'</span>, <span class="string">b'f'</span>)]); |
| <span class="kw">let </span>cls2 = bclass(<span class="kw-2">&</span>[(<span class="string">b'b'</span>, <span class="string">b'c'</span>), (<span class="string">b'd'</span>, <span class="string">b'e'</span>), (<span class="string">b'f'</span>, <span class="string">b'g'</span>)]); |
| <span class="kw">let </span>expected = bclass(<span class="kw-2">&</span>[(<span class="string">b'b'</span>, <span class="string">b'f'</span>)]); |
| <span class="macro">assert_eq!</span>(expected, bintersect(<span class="kw-2">&</span>cls1, <span class="kw-2">&</span>cls2)); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>class_difference_unicode() { |
| <span class="kw">let </span>cls1 = uclass(<span class="kw-2">&</span>[(<span class="string">'a'</span>, <span class="string">'a'</span>)]); |
| <span class="kw">let </span>cls2 = uclass(<span class="kw-2">&</span>[(<span class="string">'a'</span>, <span class="string">'a'</span>)]); |
| <span class="kw">let </span>expected = uclass(<span class="kw-2">&</span>[]); |
| <span class="macro">assert_eq!</span>(expected, udifference(<span class="kw-2">&</span>cls1, <span class="kw-2">&</span>cls2)); |
| |
| <span class="kw">let </span>cls1 = uclass(<span class="kw-2">&</span>[(<span class="string">'a'</span>, <span class="string">'a'</span>)]); |
| <span class="kw">let </span>cls2 = uclass(<span class="kw-2">&</span>[]); |
| <span class="kw">let </span>expected = uclass(<span class="kw-2">&</span>[(<span class="string">'a'</span>, <span class="string">'a'</span>)]); |
| <span class="macro">assert_eq!</span>(expected, udifference(<span class="kw-2">&</span>cls1, <span class="kw-2">&</span>cls2)); |
| |
| <span class="kw">let </span>cls1 = uclass(<span class="kw-2">&</span>[]); |
| <span class="kw">let </span>cls2 = uclass(<span class="kw-2">&</span>[(<span class="string">'a'</span>, <span class="string">'a'</span>)]); |
| <span class="kw">let </span>expected = uclass(<span class="kw-2">&</span>[]); |
| <span class="macro">assert_eq!</span>(expected, udifference(<span class="kw-2">&</span>cls1, <span class="kw-2">&</span>cls2)); |
| |
| <span class="kw">let </span>cls1 = uclass(<span class="kw-2">&</span>[(<span class="string">'a'</span>, <span class="string">'z'</span>)]); |
| <span class="kw">let </span>cls2 = uclass(<span class="kw-2">&</span>[(<span class="string">'a'</span>, <span class="string">'a'</span>)]); |
| <span class="kw">let </span>expected = uclass(<span class="kw-2">&</span>[(<span class="string">'b'</span>, <span class="string">'z'</span>)]); |
| <span class="macro">assert_eq!</span>(expected, udifference(<span class="kw-2">&</span>cls1, <span class="kw-2">&</span>cls2)); |
| |
| <span class="kw">let </span>cls1 = uclass(<span class="kw-2">&</span>[(<span class="string">'a'</span>, <span class="string">'z'</span>)]); |
| <span class="kw">let </span>cls2 = uclass(<span class="kw-2">&</span>[(<span class="string">'z'</span>, <span class="string">'z'</span>)]); |
| <span class="kw">let </span>expected = uclass(<span class="kw-2">&</span>[(<span class="string">'a'</span>, <span class="string">'y'</span>)]); |
| <span class="macro">assert_eq!</span>(expected, udifference(<span class="kw-2">&</span>cls1, <span class="kw-2">&</span>cls2)); |
| |
| <span class="kw">let </span>cls1 = uclass(<span class="kw-2">&</span>[(<span class="string">'a'</span>, <span class="string">'z'</span>)]); |
| <span class="kw">let </span>cls2 = uclass(<span class="kw-2">&</span>[(<span class="string">'m'</span>, <span class="string">'m'</span>)]); |
| <span class="kw">let </span>expected = uclass(<span class="kw-2">&</span>[(<span class="string">'a'</span>, <span class="string">'l'</span>), (<span class="string">'n'</span>, <span class="string">'z'</span>)]); |
| <span class="macro">assert_eq!</span>(expected, udifference(<span class="kw-2">&</span>cls1, <span class="kw-2">&</span>cls2)); |
| |
| <span class="kw">let </span>cls1 = uclass(<span class="kw-2">&</span>[(<span class="string">'a'</span>, <span class="string">'c'</span>), (<span class="string">'g'</span>, <span class="string">'i'</span>), (<span class="string">'r'</span>, <span class="string">'t'</span>)]); |
| <span class="kw">let </span>cls2 = uclass(<span class="kw-2">&</span>[(<span class="string">'a'</span>, <span class="string">'z'</span>)]); |
| <span class="kw">let </span>expected = uclass(<span class="kw-2">&</span>[]); |
| <span class="macro">assert_eq!</span>(expected, udifference(<span class="kw-2">&</span>cls1, <span class="kw-2">&</span>cls2)); |
| |
| <span class="kw">let </span>cls1 = uclass(<span class="kw-2">&</span>[(<span class="string">'a'</span>, <span class="string">'c'</span>), (<span class="string">'g'</span>, <span class="string">'i'</span>), (<span class="string">'r'</span>, <span class="string">'t'</span>)]); |
| <span class="kw">let </span>cls2 = uclass(<span class="kw-2">&</span>[(<span class="string">'d'</span>, <span class="string">'v'</span>)]); |
| <span class="kw">let </span>expected = uclass(<span class="kw-2">&</span>[(<span class="string">'a'</span>, <span class="string">'c'</span>)]); |
| <span class="macro">assert_eq!</span>(expected, udifference(<span class="kw-2">&</span>cls1, <span class="kw-2">&</span>cls2)); |
| |
| <span class="kw">let </span>cls1 = uclass(<span class="kw-2">&</span>[(<span class="string">'a'</span>, <span class="string">'c'</span>), (<span class="string">'g'</span>, <span class="string">'i'</span>), (<span class="string">'r'</span>, <span class="string">'t'</span>)]); |
| <span class="kw">let </span>cls2 = uclass(<span class="kw-2">&</span>[(<span class="string">'b'</span>, <span class="string">'g'</span>), (<span class="string">'s'</span>, <span class="string">'u'</span>)]); |
| <span class="kw">let </span>expected = uclass(<span class="kw-2">&</span>[(<span class="string">'a'</span>, <span class="string">'a'</span>), (<span class="string">'h'</span>, <span class="string">'i'</span>), (<span class="string">'r'</span>, <span class="string">'r'</span>)]); |
| <span class="macro">assert_eq!</span>(expected, udifference(<span class="kw-2">&</span>cls1, <span class="kw-2">&</span>cls2)); |
| |
| <span class="kw">let </span>cls1 = uclass(<span class="kw-2">&</span>[(<span class="string">'a'</span>, <span class="string">'c'</span>), (<span class="string">'g'</span>, <span class="string">'i'</span>), (<span class="string">'r'</span>, <span class="string">'t'</span>)]); |
| <span class="kw">let </span>cls2 = uclass(<span class="kw-2">&</span>[(<span class="string">'b'</span>, <span class="string">'d'</span>), (<span class="string">'e'</span>, <span class="string">'g'</span>), (<span class="string">'s'</span>, <span class="string">'u'</span>)]); |
| <span class="kw">let </span>expected = uclass(<span class="kw-2">&</span>[(<span class="string">'a'</span>, <span class="string">'a'</span>), (<span class="string">'h'</span>, <span class="string">'i'</span>), (<span class="string">'r'</span>, <span class="string">'r'</span>)]); |
| <span class="macro">assert_eq!</span>(expected, udifference(<span class="kw-2">&</span>cls1, <span class="kw-2">&</span>cls2)); |
| |
| <span class="kw">let </span>cls1 = uclass(<span class="kw-2">&</span>[(<span class="string">'x'</span>, <span class="string">'z'</span>)]); |
| <span class="kw">let </span>cls2 = uclass(<span class="kw-2">&</span>[(<span class="string">'a'</span>, <span class="string">'c'</span>), (<span class="string">'e'</span>, <span class="string">'g'</span>), (<span class="string">'s'</span>, <span class="string">'u'</span>)]); |
| <span class="kw">let </span>expected = uclass(<span class="kw-2">&</span>[(<span class="string">'x'</span>, <span class="string">'z'</span>)]); |
| <span class="macro">assert_eq!</span>(expected, udifference(<span class="kw-2">&</span>cls1, <span class="kw-2">&</span>cls2)); |
| |
| <span class="kw">let </span>cls1 = uclass(<span class="kw-2">&</span>[(<span class="string">'a'</span>, <span class="string">'z'</span>)]); |
| <span class="kw">let </span>cls2 = uclass(<span class="kw-2">&</span>[(<span class="string">'a'</span>, <span class="string">'c'</span>), (<span class="string">'e'</span>, <span class="string">'g'</span>), (<span class="string">'s'</span>, <span class="string">'u'</span>)]); |
| <span class="kw">let </span>expected = uclass(<span class="kw-2">&</span>[(<span class="string">'d'</span>, <span class="string">'d'</span>), (<span class="string">'h'</span>, <span class="string">'r'</span>), (<span class="string">'v'</span>, <span class="string">'z'</span>)]); |
| <span class="macro">assert_eq!</span>(expected, udifference(<span class="kw-2">&</span>cls1, <span class="kw-2">&</span>cls2)); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>class_difference_bytes() { |
| <span class="kw">let </span>cls1 = bclass(<span class="kw-2">&</span>[(<span class="string">b'a'</span>, <span class="string">b'a'</span>)]); |
| <span class="kw">let </span>cls2 = bclass(<span class="kw-2">&</span>[(<span class="string">b'a'</span>, <span class="string">b'a'</span>)]); |
| <span class="kw">let </span>expected = bclass(<span class="kw-2">&</span>[]); |
| <span class="macro">assert_eq!</span>(expected, bdifference(<span class="kw-2">&</span>cls1, <span class="kw-2">&</span>cls2)); |
| |
| <span class="kw">let </span>cls1 = bclass(<span class="kw-2">&</span>[(<span class="string">b'a'</span>, <span class="string">b'a'</span>)]); |
| <span class="kw">let </span>cls2 = bclass(<span class="kw-2">&</span>[]); |
| <span class="kw">let </span>expected = bclass(<span class="kw-2">&</span>[(<span class="string">b'a'</span>, <span class="string">b'a'</span>)]); |
| <span class="macro">assert_eq!</span>(expected, bdifference(<span class="kw-2">&</span>cls1, <span class="kw-2">&</span>cls2)); |
| |
| <span class="kw">let </span>cls1 = bclass(<span class="kw-2">&</span>[]); |
| <span class="kw">let </span>cls2 = bclass(<span class="kw-2">&</span>[(<span class="string">b'a'</span>, <span class="string">b'a'</span>)]); |
| <span class="kw">let </span>expected = bclass(<span class="kw-2">&</span>[]); |
| <span class="macro">assert_eq!</span>(expected, bdifference(<span class="kw-2">&</span>cls1, <span class="kw-2">&</span>cls2)); |
| |
| <span class="kw">let </span>cls1 = bclass(<span class="kw-2">&</span>[(<span class="string">b'a'</span>, <span class="string">b'z'</span>)]); |
| <span class="kw">let </span>cls2 = bclass(<span class="kw-2">&</span>[(<span class="string">b'a'</span>, <span class="string">b'a'</span>)]); |
| <span class="kw">let </span>expected = bclass(<span class="kw-2">&</span>[(<span class="string">b'b'</span>, <span class="string">b'z'</span>)]); |
| <span class="macro">assert_eq!</span>(expected, bdifference(<span class="kw-2">&</span>cls1, <span class="kw-2">&</span>cls2)); |
| |
| <span class="kw">let </span>cls1 = bclass(<span class="kw-2">&</span>[(<span class="string">b'a'</span>, <span class="string">b'z'</span>)]); |
| <span class="kw">let </span>cls2 = bclass(<span class="kw-2">&</span>[(<span class="string">b'z'</span>, <span class="string">b'z'</span>)]); |
| <span class="kw">let </span>expected = bclass(<span class="kw-2">&</span>[(<span class="string">b'a'</span>, <span class="string">b'y'</span>)]); |
| <span class="macro">assert_eq!</span>(expected, bdifference(<span class="kw-2">&</span>cls1, <span class="kw-2">&</span>cls2)); |
| |
| <span class="kw">let </span>cls1 = bclass(<span class="kw-2">&</span>[(<span class="string">b'a'</span>, <span class="string">b'z'</span>)]); |
| <span class="kw">let </span>cls2 = bclass(<span class="kw-2">&</span>[(<span class="string">b'm'</span>, <span class="string">b'm'</span>)]); |
| <span class="kw">let </span>expected = bclass(<span class="kw-2">&</span>[(<span class="string">b'a'</span>, <span class="string">b'l'</span>), (<span class="string">b'n'</span>, <span class="string">b'z'</span>)]); |
| <span class="macro">assert_eq!</span>(expected, bdifference(<span class="kw-2">&</span>cls1, <span class="kw-2">&</span>cls2)); |
| |
| <span class="kw">let </span>cls1 = bclass(<span class="kw-2">&</span>[(<span class="string">b'a'</span>, <span class="string">b'c'</span>), (<span class="string">b'g'</span>, <span class="string">b'i'</span>), (<span class="string">b'r'</span>, <span class="string">b't'</span>)]); |
| <span class="kw">let </span>cls2 = bclass(<span class="kw-2">&</span>[(<span class="string">b'a'</span>, <span class="string">b'z'</span>)]); |
| <span class="kw">let </span>expected = bclass(<span class="kw-2">&</span>[]); |
| <span class="macro">assert_eq!</span>(expected, bdifference(<span class="kw-2">&</span>cls1, <span class="kw-2">&</span>cls2)); |
| |
| <span class="kw">let </span>cls1 = bclass(<span class="kw-2">&</span>[(<span class="string">b'a'</span>, <span class="string">b'c'</span>), (<span class="string">b'g'</span>, <span class="string">b'i'</span>), (<span class="string">b'r'</span>, <span class="string">b't'</span>)]); |
| <span class="kw">let </span>cls2 = bclass(<span class="kw-2">&</span>[(<span class="string">b'd'</span>, <span class="string">b'v'</span>)]); |
| <span class="kw">let </span>expected = bclass(<span class="kw-2">&</span>[(<span class="string">b'a'</span>, <span class="string">b'c'</span>)]); |
| <span class="macro">assert_eq!</span>(expected, bdifference(<span class="kw-2">&</span>cls1, <span class="kw-2">&</span>cls2)); |
| |
| <span class="kw">let </span>cls1 = bclass(<span class="kw-2">&</span>[(<span class="string">b'a'</span>, <span class="string">b'c'</span>), (<span class="string">b'g'</span>, <span class="string">b'i'</span>), (<span class="string">b'r'</span>, <span class="string">b't'</span>)]); |
| <span class="kw">let </span>cls2 = bclass(<span class="kw-2">&</span>[(<span class="string">b'b'</span>, <span class="string">b'g'</span>), (<span class="string">b's'</span>, <span class="string">b'u'</span>)]); |
| <span class="kw">let </span>expected = bclass(<span class="kw-2">&</span>[(<span class="string">b'a'</span>, <span class="string">b'a'</span>), (<span class="string">b'h'</span>, <span class="string">b'i'</span>), (<span class="string">b'r'</span>, <span class="string">b'r'</span>)]); |
| <span class="macro">assert_eq!</span>(expected, bdifference(<span class="kw-2">&</span>cls1, <span class="kw-2">&</span>cls2)); |
| |
| <span class="kw">let </span>cls1 = bclass(<span class="kw-2">&</span>[(<span class="string">b'a'</span>, <span class="string">b'c'</span>), (<span class="string">b'g'</span>, <span class="string">b'i'</span>), (<span class="string">b'r'</span>, <span class="string">b't'</span>)]); |
| <span class="kw">let </span>cls2 = bclass(<span class="kw-2">&</span>[(<span class="string">b'b'</span>, <span class="string">b'd'</span>), (<span class="string">b'e'</span>, <span class="string">b'g'</span>), (<span class="string">b's'</span>, <span class="string">b'u'</span>)]); |
| <span class="kw">let </span>expected = bclass(<span class="kw-2">&</span>[(<span class="string">b'a'</span>, <span class="string">b'a'</span>), (<span class="string">b'h'</span>, <span class="string">b'i'</span>), (<span class="string">b'r'</span>, <span class="string">b'r'</span>)]); |
| <span class="macro">assert_eq!</span>(expected, bdifference(<span class="kw-2">&</span>cls1, <span class="kw-2">&</span>cls2)); |
| |
| <span class="kw">let </span>cls1 = bclass(<span class="kw-2">&</span>[(<span class="string">b'x'</span>, <span class="string">b'z'</span>)]); |
| <span class="kw">let </span>cls2 = bclass(<span class="kw-2">&</span>[(<span class="string">b'a'</span>, <span class="string">b'c'</span>), (<span class="string">b'e'</span>, <span class="string">b'g'</span>), (<span class="string">b's'</span>, <span class="string">b'u'</span>)]); |
| <span class="kw">let </span>expected = bclass(<span class="kw-2">&</span>[(<span class="string">b'x'</span>, <span class="string">b'z'</span>)]); |
| <span class="macro">assert_eq!</span>(expected, bdifference(<span class="kw-2">&</span>cls1, <span class="kw-2">&</span>cls2)); |
| |
| <span class="kw">let </span>cls1 = bclass(<span class="kw-2">&</span>[(<span class="string">b'a'</span>, <span class="string">b'z'</span>)]); |
| <span class="kw">let </span>cls2 = bclass(<span class="kw-2">&</span>[(<span class="string">b'a'</span>, <span class="string">b'c'</span>), (<span class="string">b'e'</span>, <span class="string">b'g'</span>), (<span class="string">b's'</span>, <span class="string">b'u'</span>)]); |
| <span class="kw">let </span>expected = bclass(<span class="kw-2">&</span>[(<span class="string">b'd'</span>, <span class="string">b'd'</span>), (<span class="string">b'h'</span>, <span class="string">b'r'</span>), (<span class="string">b'v'</span>, <span class="string">b'z'</span>)]); |
| <span class="macro">assert_eq!</span>(expected, bdifference(<span class="kw-2">&</span>cls1, <span class="kw-2">&</span>cls2)); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>class_symmetric_difference_unicode() { |
| <span class="kw">let </span>cls1 = uclass(<span class="kw-2">&</span>[(<span class="string">'a'</span>, <span class="string">'m'</span>)]); |
| <span class="kw">let </span>cls2 = uclass(<span class="kw-2">&</span>[(<span class="string">'g'</span>, <span class="string">'t'</span>)]); |
| <span class="kw">let </span>expected = uclass(<span class="kw-2">&</span>[(<span class="string">'a'</span>, <span class="string">'f'</span>), (<span class="string">'n'</span>, <span class="string">'t'</span>)]); |
| <span class="macro">assert_eq!</span>(expected, usymdifference(<span class="kw-2">&</span>cls1, <span class="kw-2">&</span>cls2)); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>class_symmetric_difference_bytes() { |
| <span class="kw">let </span>cls1 = bclass(<span class="kw-2">&</span>[(<span class="string">b'a'</span>, <span class="string">b'm'</span>)]); |
| <span class="kw">let </span>cls2 = bclass(<span class="kw-2">&</span>[(<span class="string">b'g'</span>, <span class="string">b't'</span>)]); |
| <span class="kw">let </span>expected = bclass(<span class="kw-2">&</span>[(<span class="string">b'a'</span>, <span class="string">b'f'</span>), (<span class="string">b'n'</span>, <span class="string">b't'</span>)]); |
| <span class="macro">assert_eq!</span>(expected, bsymdifference(<span class="kw-2">&</span>cls1, <span class="kw-2">&</span>cls2)); |
| } |
| |
| <span class="comment">// We use a thread with an explicit stack size to test that our destructor |
| // for Hir can handle arbitrarily sized expressions in constant stack |
| // space. In case we run on a platform without threads (WASM?), we limit |
| // this test to Windows/Unix. |
| </span><span class="attribute">#[test] |
| #[cfg(any(unix, windows))] |
| </span><span class="kw">fn </span>no_stack_overflow_on_drop() { |
| <span class="kw">use </span>std::thread; |
| |
| <span class="kw">let </span>run = || { |
| <span class="kw">let </span><span class="kw-2">mut </span>expr = Hir::empty(); |
| <span class="kw">for _ in </span><span class="number">0</span>..<span class="number">100 </span>{ |
| expr = Hir::capture(Capture { |
| index: <span class="number">1</span>, |
| name: <span class="prelude-val">None</span>, |
| sub: Box::new(expr), |
| }); |
| expr = Hir::repetition(Repetition { |
| min: <span class="number">0</span>, |
| max: <span class="prelude-val">Some</span>(<span class="number">1</span>), |
| greedy: <span class="bool-val">true</span>, |
| sub: Box::new(expr), |
| }); |
| |
| expr = Hir { |
| kind: HirKind::Concat(<span class="macro">vec!</span>[expr]), |
| props: Properties::empty(), |
| }; |
| expr = Hir { |
| kind: HirKind::Alternation(<span class="macro">vec!</span>[expr]), |
| props: Properties::empty(), |
| }; |
| } |
| <span class="macro">assert!</span>(!<span class="macro">matches!</span>(<span class="kw-2">*</span>expr.kind(), HirKind::Empty)); |
| }; |
| |
| <span class="comment">// We run our test on a thread with a small stack size so we can |
| // force the issue more easily. |
| // |
| // NOTE(2023-03-21): See the corresponding test in 'crate::ast::tests' |
| // for context on the specific stack size chosen here. |
| </span>thread::Builder::new() |
| .stack_size(<span class="number">16 </span><< <span class="number">10</span>) |
| .spawn(run) |
| .unwrap() |
| .join() |
| .unwrap(); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>look_set_iter() { |
| <span class="kw">let </span>set = LookSet::empty(); |
| <span class="macro">assert_eq!</span>(<span class="number">0</span>, set.iter().count()); |
| |
| <span class="kw">let </span>set = LookSet::full(); |
| <span class="macro">assert_eq!</span>(<span class="number">10</span>, set.iter().count()); |
| |
| <span class="kw">let </span>set = |
| LookSet::empty().insert(Look::StartLF).insert(Look::WordUnicode); |
| <span class="macro">assert_eq!</span>(<span class="number">2</span>, set.iter().count()); |
| |
| <span class="kw">let </span>set = LookSet::empty().insert(Look::StartLF); |
| <span class="macro">assert_eq!</span>(<span class="number">1</span>, set.iter().count()); |
| |
| <span class="kw">let </span>set = LookSet::empty().insert(Look::WordAsciiNegate); |
| <span class="macro">assert_eq!</span>(<span class="number">1</span>, set.iter().count()); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>look_set_debug() { |
| <span class="kw">let </span>res = <span class="macro">format!</span>(<span class="string">"{:?}"</span>, LookSet::empty()); |
| <span class="macro">assert_eq!</span>(<span class="string">"∅"</span>, res); |
| <span class="kw">let </span>res = <span class="macro">format!</span>(<span class="string">"{:?}"</span>, LookSet::full()); |
| <span class="macro">assert_eq!</span>(<span class="string">"Az^$rRbB𝛃𝚩"</span>, res); |
| } |
| } |
| </code></pre></div> |
| </section></div></main><div id="rustdoc-vars" data-root-path="../../../" data-current-crate="regex_syntax" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |
