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</pre><pre class="rust"><code><span class="doccomment">/// The set of user configurable options for compiling zero or more regexes.
</span><span class="attribute">#[derive(Clone, Debug)]
#[allow(missing_docs)]
</span><span class="kw">pub struct </span>RegexOptions {
<span class="kw">pub </span>pats: Vec&lt;String&gt;,
<span class="kw">pub </span>size_limit: usize,
<span class="kw">pub </span>dfa_size_limit: usize,
<span class="kw">pub </span>nest_limit: u32,
<span class="kw">pub </span>case_insensitive: bool,
<span class="kw">pub </span>multi_line: bool,
<span class="kw">pub </span>dot_matches_new_line: bool,
<span class="kw">pub </span>swap_greed: bool,
<span class="kw">pub </span>ignore_whitespace: bool,
<span class="kw">pub </span>unicode: bool,
<span class="kw">pub </span>octal: bool,
}
<span class="kw">impl </span>Default <span class="kw">for </span>RegexOptions {
<span class="kw">fn </span>default() -&gt; <span class="self">Self </span>{
RegexOptions {
pats: <span class="macro">vec!</span>[],
size_limit: <span class="number">10 </span>* (<span class="number">1 </span>&lt;&lt; <span class="number">20</span>),
dfa_size_limit: <span class="number">2 </span>* (<span class="number">1 </span>&lt;&lt; <span class="number">20</span>),
nest_limit: <span class="number">250</span>,
case_insensitive: <span class="bool-val">false</span>,
multi_line: <span class="bool-val">false</span>,
dot_matches_new_line: <span class="bool-val">false</span>,
swap_greed: <span class="bool-val">false</span>,
ignore_whitespace: <span class="bool-val">false</span>,
unicode: <span class="bool-val">true</span>,
octal: <span class="bool-val">false</span>,
}
}
}
<span class="macro">macro_rules! </span>define_builder {
(<span class="macro-nonterminal">$name</span>:ident, <span class="macro-nonterminal">$regex_mod</span>:ident, <span class="macro-nonterminal">$only_utf8</span>:expr) =&gt; {
<span class="kw">pub mod </span><span class="macro-nonterminal">$name </span>{
<span class="kw">use </span><span class="kw">super</span>::RegexOptions;
<span class="kw">use </span><span class="kw">crate</span>::error::Error;
<span class="kw">use </span><span class="kw">crate</span>::exec::ExecBuilder;
<span class="kw">use crate</span>::<span class="macro-nonterminal">$regex_mod::Regex</span>;
<span class="doccomment">/// A configurable builder for a regular expression.
///
/// A builder can be used to configure how the regex is built, for example, by
/// setting the default flags (which can be overridden in the expression
/// itself) or setting various limits.
</span><span class="attribute">#[derive(Debug)]
</span><span class="kw">pub struct </span>RegexBuilder(RegexOptions);
<span class="kw">impl </span>RegexBuilder {
<span class="doccomment">/// Create a new regular expression builder with the given pattern.
///
/// If the pattern is invalid, then an error will be returned when
/// `build` is called.
</span><span class="kw">pub fn </span>new(pattern: <span class="kw-2">&amp;</span>str) -&gt; RegexBuilder {
<span class="kw">let </span><span class="kw-2">mut </span>builder = RegexBuilder(RegexOptions::default());
builder.<span class="number">0</span>.pats.push(pattern.to_owned());
builder
}
<span class="doccomment">/// Consume the builder and compile the regular expression.
///
/// Note that calling `as_str` on the resulting `Regex` will produce the
/// pattern given to `new` verbatim. Notably, it will not incorporate any
/// of the flags set on this builder.
</span><span class="kw">pub fn </span>build(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="prelude-ty">Result</span>&lt;Regex, Error&gt; {
ExecBuilder::new_options(<span class="self">self</span>.<span class="number">0</span>.clone())
.only_utf8(<span class="macro-nonterminal">$only_utf8</span>)
.build()
.map(Regex::from)
}
<span class="doccomment">/// Set the value for the case insensitive (`i`) flag.
///
/// When enabled, letters in the pattern will match both upper case and
/// lower case variants.
</span><span class="kw">pub fn </span>case_insensitive(
<span class="kw-2">&amp;mut </span><span class="self">self</span>,
yes: bool,
) -&gt; <span class="kw-2">&amp;mut </span>RegexBuilder {
<span class="self">self</span>.<span class="number">0</span>.case_insensitive = yes;
<span class="self">self
</span>}
<span class="doccomment">/// Set the value for the multi-line matching (`m`) flag.
///
/// When enabled, `^` matches the beginning of lines and `$` matches the
/// end of lines.
///
/// By default, they match beginning/end of the input.
</span><span class="kw">pub fn </span>multi_line(<span class="kw-2">&amp;mut </span><span class="self">self</span>, yes: bool) -&gt; <span class="kw-2">&amp;mut </span>RegexBuilder {
<span class="self">self</span>.<span class="number">0</span>.multi_line = yes;
<span class="self">self
</span>}
<span class="doccomment">/// Set the value for the any character (`s`) flag, where in `.` matches
/// anything when `s` is set and matches anything except for new line when
/// it is not set (the default).
///
/// N.B. &quot;matches anything&quot; means &quot;any byte&quot; when Unicode is disabled and
/// means &quot;any valid UTF-8 encoding of any Unicode scalar value&quot; when
/// Unicode is enabled.
</span><span class="kw">pub fn </span>dot_matches_new_line(
<span class="kw-2">&amp;mut </span><span class="self">self</span>,
yes: bool,
) -&gt; <span class="kw-2">&amp;mut </span>RegexBuilder {
<span class="self">self</span>.<span class="number">0</span>.dot_matches_new_line = yes;
<span class="self">self
</span>}
<span class="doccomment">/// Set the value for the greedy swap (`U`) flag.
///
/// When enabled, a pattern like `a*` is lazy (tries to find shortest
/// match) and `a*?` is greedy (tries to find longest match).
///
/// By default, `a*` is greedy and `a*?` is lazy.
</span><span class="kw">pub fn </span>swap_greed(<span class="kw-2">&amp;mut </span><span class="self">self</span>, yes: bool) -&gt; <span class="kw-2">&amp;mut </span>RegexBuilder {
<span class="self">self</span>.<span class="number">0</span>.swap_greed = yes;
<span class="self">self
</span>}
<span class="doccomment">/// Set the value for the ignore whitespace (`x`) flag.
///
/// When enabled, whitespace such as new lines and spaces will be ignored
/// between expressions of the pattern, and `#` can be used to start a
/// comment until the next new line.
</span><span class="kw">pub fn </span>ignore_whitespace(
<span class="kw-2">&amp;mut </span><span class="self">self</span>,
yes: bool,
) -&gt; <span class="kw-2">&amp;mut </span>RegexBuilder {
<span class="self">self</span>.<span class="number">0</span>.ignore_whitespace = yes;
<span class="self">self
</span>}
<span class="doccomment">/// Set the value for the Unicode (`u`) flag.
///
/// Enabled by default. When disabled, character classes such as `\w` only
/// match ASCII word characters instead of all Unicode word characters.
</span><span class="kw">pub fn </span>unicode(<span class="kw-2">&amp;mut </span><span class="self">self</span>, yes: bool) -&gt; <span class="kw-2">&amp;mut </span>RegexBuilder {
<span class="self">self</span>.<span class="number">0</span>.unicode = yes;
<span class="self">self
</span>}
<span class="doccomment">/// Whether to support octal syntax or not.
///
/// Octal syntax is a little-known way of uttering Unicode codepoints in
/// a regular expression. For example, `a`, `\x61`, `\u0061` and
/// `\141` are all equivalent regular expressions, where the last example
/// shows octal syntax.
///
/// While supporting octal syntax isn&#39;t in and of itself a problem, it does
/// make good error messages harder. That is, in PCRE based regex engines,
/// syntax like `\0` invokes a backreference, which is explicitly
/// unsupported in Rust&#39;s regex engine. However, many users expect it to
/// be supported. Therefore, when octal support is disabled, the error
/// message will explicitly mention that backreferences aren&#39;t supported.
///
/// Octal syntax is disabled by default.
</span><span class="kw">pub fn </span>octal(<span class="kw-2">&amp;mut </span><span class="self">self</span>, yes: bool) -&gt; <span class="kw-2">&amp;mut </span>RegexBuilder {
<span class="self">self</span>.<span class="number">0</span>.octal = yes;
<span class="self">self
</span>}
<span class="doccomment">/// Set the approximate size limit of the compiled regular expression.
///
/// This roughly corresponds to the number of bytes occupied by a single
/// compiled program. If the program exceeds this number, then a
/// compilation error is returned.
</span><span class="kw">pub fn </span>size_limit(
<span class="kw-2">&amp;mut </span><span class="self">self</span>,
limit: usize,
) -&gt; <span class="kw-2">&amp;mut </span>RegexBuilder {
<span class="self">self</span>.<span class="number">0</span>.size_limit = limit;
<span class="self">self
</span>}
<span class="doccomment">/// Set the approximate size of the cache used by the DFA.
///
/// This roughly corresponds to the number of bytes that the DFA will
/// use while searching.
///
/// Note that this is a *per thread* limit. There is no way to set a global
/// limit. In particular, if a regex is used from multiple threads
/// simultaneously, then each thread may use up to the number of bytes
/// specified here.
</span><span class="kw">pub fn </span>dfa_size_limit(
<span class="kw-2">&amp;mut </span><span class="self">self</span>,
limit: usize,
) -&gt; <span class="kw-2">&amp;mut </span>RegexBuilder {
<span class="self">self</span>.<span class="number">0</span>.dfa_size_limit = limit;
<span class="self">self
</span>}
<span class="doccomment">/// Set the nesting limit for this parser.
///
/// The nesting limit controls how deep the abstract syntax tree is allowed
/// to be. If the AST exceeds the given limit (e.g., with too many nested
/// groups), then an error is returned by the parser.
///
/// The purpose of this limit is to act as a heuristic to prevent stack
/// overflow for consumers that do structural induction on an `Ast` using
/// explicit recursion. While this crate never does this (instead using
/// constant stack space and moving the call stack to the heap), other
/// crates may.
///
/// This limit is not checked until the entire Ast is parsed. Therefore,
/// if callers want to put a limit on the amount of heap space used, then
/// they should impose a limit on the length, in bytes, of the concrete
/// pattern string. In particular, this is viable since this parser
/// implementation will limit itself to heap space proportional to the
/// length of the pattern string.
///
/// Note that a nest limit of `0` will return a nest limit error for most
/// patterns but not all. For example, a nest limit of `0` permits `a` but
/// not `ab`, since `ab` requires a concatenation, which results in a nest
/// depth of `1`. In general, a nest limit is not something that manifests
/// in an obvious way in the concrete syntax, therefore, it should not be
/// used in a granular way.
</span><span class="kw">pub fn </span>nest_limit(<span class="kw-2">&amp;mut </span><span class="self">self</span>, limit: u32) -&gt; <span class="kw-2">&amp;mut </span>RegexBuilder {
<span class="self">self</span>.<span class="number">0</span>.nest_limit = limit;
<span class="self">self
</span>}
}
}
};
}
<span class="macro">define_builder!</span>(bytes, re_bytes, <span class="bool-val">false</span>);
<span class="macro">define_builder!</span>(unicode, re_unicode, <span class="bool-val">true</span>);
<span class="macro">macro_rules! </span>define_set_builder {
(<span class="macro-nonterminal">$name</span>:ident, <span class="macro-nonterminal">$regex_mod</span>:ident, <span class="macro-nonterminal">$only_utf8</span>:expr) =&gt; {
<span class="kw">pub mod </span><span class="macro-nonterminal">$name </span>{
<span class="kw">use </span><span class="kw">super</span>::RegexOptions;
<span class="kw">use </span><span class="kw">crate</span>::error::Error;
<span class="kw">use </span><span class="kw">crate</span>::exec::ExecBuilder;
<span class="kw">use </span><span class="kw">crate</span>::re_set::<span class="macro-nonterminal">$regex_mod::RegexSet</span>;
<span class="doccomment">/// A configurable builder for a set of regular expressions.
///
/// A builder can be used to configure how the regexes are built, for example,
/// by setting the default flags (which can be overridden in the expression
/// itself) or setting various limits.
</span><span class="attribute">#[derive(Debug)]
</span><span class="kw">pub struct </span>RegexSetBuilder(RegexOptions);
<span class="kw">impl </span>RegexSetBuilder {
<span class="doccomment">/// Create a new regular expression builder with the given pattern.
///
/// If the pattern is invalid, then an error will be returned when
/// `build` is called.
</span><span class="kw">pub fn </span>new&lt;I, S&gt;(patterns: I) -&gt; RegexSetBuilder
<span class="kw">where
</span>S: AsRef&lt;str&gt;,
I: IntoIterator&lt;Item = S&gt;,
{
<span class="kw">let </span><span class="kw-2">mut </span>builder = RegexSetBuilder(RegexOptions::default());
<span class="kw">for </span>pat <span class="kw">in </span>patterns {
builder.<span class="number">0</span>.pats.push(pat.as_ref().to_owned());
}
builder
}
<span class="doccomment">/// Consume the builder and compile the regular expressions into a set.
</span><span class="kw">pub fn </span>build(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="prelude-ty">Result</span>&lt;RegexSet, Error&gt; {
ExecBuilder::new_options(<span class="self">self</span>.<span class="number">0</span>.clone())
.only_utf8(<span class="macro-nonterminal">$only_utf8</span>)
.build()
.map(RegexSet::from)
}
<span class="doccomment">/// Set the value for the case insensitive (`i`) flag.
</span><span class="kw">pub fn </span>case_insensitive(
<span class="kw-2">&amp;mut </span><span class="self">self</span>,
yes: bool,
) -&gt; <span class="kw-2">&amp;mut </span>RegexSetBuilder {
<span class="self">self</span>.<span class="number">0</span>.case_insensitive = yes;
<span class="self">self
</span>}
<span class="doccomment">/// Set the value for the multi-line matching (`m`) flag.
</span><span class="kw">pub fn </span>multi_line(
<span class="kw-2">&amp;mut </span><span class="self">self</span>,
yes: bool,
) -&gt; <span class="kw-2">&amp;mut </span>RegexSetBuilder {
<span class="self">self</span>.<span class="number">0</span>.multi_line = yes;
<span class="self">self
</span>}
<span class="doccomment">/// Set the value for the any character (`s`) flag, where in `.` matches
/// anything when `s` is set and matches anything except for new line when
/// it is not set (the default).
///
/// N.B. &quot;matches anything&quot; means &quot;any byte&quot; for `regex::bytes::RegexSet`
/// expressions and means &quot;any Unicode scalar value&quot; for `regex::RegexSet`
/// expressions.
</span><span class="kw">pub fn </span>dot_matches_new_line(
<span class="kw-2">&amp;mut </span><span class="self">self</span>,
yes: bool,
) -&gt; <span class="kw-2">&amp;mut </span>RegexSetBuilder {
<span class="self">self</span>.<span class="number">0</span>.dot_matches_new_line = yes;
<span class="self">self
</span>}
<span class="doccomment">/// Set the value for the greedy swap (`U`) flag.
</span><span class="kw">pub fn </span>swap_greed(
<span class="kw-2">&amp;mut </span><span class="self">self</span>,
yes: bool,
) -&gt; <span class="kw-2">&amp;mut </span>RegexSetBuilder {
<span class="self">self</span>.<span class="number">0</span>.swap_greed = yes;
<span class="self">self
</span>}
<span class="doccomment">/// Set the value for the ignore whitespace (`x`) flag.
</span><span class="kw">pub fn </span>ignore_whitespace(
<span class="kw-2">&amp;mut </span><span class="self">self</span>,
yes: bool,
) -&gt; <span class="kw-2">&amp;mut </span>RegexSetBuilder {
<span class="self">self</span>.<span class="number">0</span>.ignore_whitespace = yes;
<span class="self">self
</span>}
<span class="doccomment">/// Set the value for the Unicode (`u`) flag.
</span><span class="kw">pub fn </span>unicode(<span class="kw-2">&amp;mut </span><span class="self">self</span>, yes: bool) -&gt; <span class="kw-2">&amp;mut </span>RegexSetBuilder {
<span class="self">self</span>.<span class="number">0</span>.unicode = yes;
<span class="self">self
</span>}
<span class="doccomment">/// Whether to support octal syntax or not.
///
/// Octal syntax is a little-known way of uttering Unicode codepoints in
/// a regular expression. For example, `a`, `\x61`, `\u0061` and
/// `\141` are all equivalent regular expressions, where the last example
/// shows octal syntax.
///
/// While supporting octal syntax isn&#39;t in and of itself a problem, it does
/// make good error messages harder. That is, in PCRE based regex engines,
/// syntax like `\0` invokes a backreference, which is explicitly
/// unsupported in Rust&#39;s regex engine. However, many users expect it to
/// be supported. Therefore, when octal support is disabled, the error
/// message will explicitly mention that backreferences aren&#39;t supported.
///
/// Octal syntax is disabled by default.
</span><span class="kw">pub fn </span>octal(<span class="kw-2">&amp;mut </span><span class="self">self</span>, yes: bool) -&gt; <span class="kw-2">&amp;mut </span>RegexSetBuilder {
<span class="self">self</span>.<span class="number">0</span>.octal = yes;
<span class="self">self
</span>}
<span class="doccomment">/// Set the approximate size limit of the compiled regular expression.
///
/// This roughly corresponds to the number of bytes occupied by a single
/// compiled program. If the program exceeds this number, then a
/// compilation error is returned.
</span><span class="kw">pub fn </span>size_limit(
<span class="kw-2">&amp;mut </span><span class="self">self</span>,
limit: usize,
) -&gt; <span class="kw-2">&amp;mut </span>RegexSetBuilder {
<span class="self">self</span>.<span class="number">0</span>.size_limit = limit;
<span class="self">self
</span>}
<span class="doccomment">/// Set the approximate size of the cache used by the DFA.
///
/// This roughly corresponds to the number of bytes that the DFA will
/// use while searching.
///
/// Note that this is a *per thread* limit. There is no way to set a global
/// limit. In particular, if a regex is used from multiple threads
/// simultaneously, then each thread may use up to the number of bytes
/// specified here.
</span><span class="kw">pub fn </span>dfa_size_limit(
<span class="kw-2">&amp;mut </span><span class="self">self</span>,
limit: usize,
) -&gt; <span class="kw-2">&amp;mut </span>RegexSetBuilder {
<span class="self">self</span>.<span class="number">0</span>.dfa_size_limit = limit;
<span class="self">self
</span>}
<span class="doccomment">/// Set the nesting limit for this parser.
///
/// The nesting limit controls how deep the abstract syntax tree is allowed
/// to be. If the AST exceeds the given limit (e.g., with too many nested
/// groups), then an error is returned by the parser.
///
/// The purpose of this limit is to act as a heuristic to prevent stack
/// overflow for consumers that do structural induction on an `Ast` using
/// explicit recursion. While this crate never does this (instead using
/// constant stack space and moving the call stack to the heap), other
/// crates may.
///
/// This limit is not checked until the entire Ast is parsed. Therefore,
/// if callers want to put a limit on the amount of heap space used, then
/// they should impose a limit on the length, in bytes, of the concrete
/// pattern string. In particular, this is viable since this parser
/// implementation will limit itself to heap space proportional to the
/// length of the pattern string.
///
/// Note that a nest limit of `0` will return a nest limit error for most
/// patterns but not all. For example, a nest limit of `0` permits `a` but
/// not `ab`, since `ab` requires a concatenation, which results in a nest
/// depth of `1`. In general, a nest limit is not something that manifests
/// in an obvious way in the concrete syntax, therefore, it should not be
/// used in a granular way.
</span><span class="kw">pub fn </span>nest_limit(
<span class="kw-2">&amp;mut </span><span class="self">self</span>,
limit: u32,
) -&gt; <span class="kw-2">&amp;mut </span>RegexSetBuilder {
<span class="self">self</span>.<span class="number">0</span>.nest_limit = limit;
<span class="self">self
</span>}
}
}
};
}
<span class="macro">define_set_builder!</span>(set_bytes, bytes, <span class="bool-val">false</span>);
<span class="macro">define_set_builder!</span>(set_unicode, unicode, <span class="bool-val">true</span>);
</code></pre></div>
</section></div></main><div id="rustdoc-vars" data-root-path="../../" data-current-crate="regex" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html>