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| </pre><pre class="rust"><code><span class="kw">use </span>std::fmt; |
| <span class="kw">use </span>std::iter::FusedIterator; |
| |
| <span class="doccomment">/// Slot is a single saved capture location. Note that there are two slots for |
| /// every capture in a regular expression (one slot each for the start and end |
| /// of the capture). |
| </span><span class="kw">pub type </span>Slot = <span class="prelude-ty">Option</span><usize>; |
| |
| <span class="doccomment">/// Locations represents the offsets of each capturing group in a regex for |
| /// a single match. |
| /// |
| /// Unlike `Captures`, a `Locations` value only stores offsets. |
| </span><span class="attribute">#[doc(hidden)] |
| #[derive(Clone, Debug)] |
| </span><span class="kw">pub struct </span>Locations(Vec<Slot>); |
| |
| <span class="kw">impl </span>Locations { |
| <span class="doccomment">/// Returns the start and end positions of the Nth capture group. Returns |
| /// `None` if `i` is not a valid capture group or if the capture group did |
| /// not match anything. The positions returned are *always* byte indices |
| /// with respect to the original string matched. |
| </span><span class="kw">pub fn </span>pos(<span class="kw-2">&</span><span class="self">self</span>, i: usize) -> <span class="prelude-ty">Option</span><(usize, usize)> { |
| <span class="kw">let </span>(s, e) = (i.checked_mul(<span class="number">2</span>)<span class="question-mark">?</span>, i.checked_mul(<span class="number">2</span>)<span class="question-mark">?</span>.checked_add(<span class="number">1</span>)<span class="question-mark">?</span>); |
| <span class="kw">match </span>(<span class="self">self</span>.<span class="number">0</span>.get(s), <span class="self">self</span>.<span class="number">0</span>.get(e)) { |
| (<span class="prelude-val">Some</span>(<span class="kw-2">&</span><span class="prelude-val">Some</span>(s)), <span class="prelude-val">Some</span>(<span class="kw-2">&</span><span class="prelude-val">Some</span>(e))) => <span class="prelude-val">Some</span>((s, e)), |
| <span class="kw">_ </span>=> <span class="prelude-val">None</span>, |
| } |
| } |
| |
| <span class="doccomment">/// Creates an iterator of all the capture group positions in order of |
| /// appearance in the regular expression. Positions are byte indices |
| /// in terms of the original string matched. |
| </span><span class="kw">pub fn </span>iter(<span class="kw-2">&</span><span class="self">self</span>) -> SubCapturesPosIter<<span class="lifetime">'_</span>> { |
| SubCapturesPosIter { idx: <span class="number">0</span>, locs: <span class="self">self </span>} |
| } |
| |
| <span class="doccomment">/// Returns the total number of capturing groups. |
| /// |
| /// This is always at least `1` since every regex has at least `1` |
| /// capturing group that corresponds to the entire match. |
| </span><span class="kw">pub fn </span>len(<span class="kw-2">&</span><span class="self">self</span>) -> usize { |
| <span class="self">self</span>.<span class="number">0</span>.len() / <span class="number">2 |
| </span>} |
| |
| <span class="doccomment">/// Return the individual slots as a slice. |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>as_slots(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="kw-2">&mut </span>[Slot] { |
| <span class="kw-2">&mut </span><span class="self">self</span>.<span class="number">0 |
| </span>} |
| } |
| |
| <span class="doccomment">/// An iterator over capture group positions for a particular match of a |
| /// regular expression. |
| /// |
| /// Positions are byte indices in terms of the original string matched. |
| /// |
| /// `'c` is the lifetime of the captures. |
| </span><span class="attribute">#[derive(Clone, Debug)] |
| </span><span class="kw">pub struct </span>SubCapturesPosIter<<span class="lifetime">'c</span>> { |
| idx: usize, |
| locs: <span class="kw-2">&</span><span class="lifetime">'c </span>Locations, |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'c</span>> Iterator <span class="kw">for </span>SubCapturesPosIter<<span class="lifetime">'c</span>> { |
| <span class="kw">type </span>Item = <span class="prelude-ty">Option</span><(usize, usize)>; |
| |
| <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="prelude-ty">Option</span><(usize, usize)>> { |
| <span class="kw">if </span><span class="self">self</span>.idx >= <span class="self">self</span>.locs.len() { |
| <span class="kw">return </span><span class="prelude-val">None</span>; |
| } |
| <span class="kw">let </span>x = <span class="kw">match </span><span class="self">self</span>.locs.pos(<span class="self">self</span>.idx) { |
| <span class="prelude-val">None </span>=> <span class="prelude-val">Some</span>(<span class="prelude-val">None</span>), |
| <span class="prelude-val">Some</span>((s, e)) => <span class="prelude-val">Some</span>(<span class="prelude-val">Some</span>((s, e))), |
| }; |
| <span class="self">self</span>.idx += <span class="number">1</span>; |
| x |
| } |
| |
| <span class="kw">fn </span>size_hint(<span class="kw-2">&</span><span class="self">self</span>) -> (usize, <span class="prelude-ty">Option</span><usize>) { |
| <span class="kw">let </span>len = <span class="self">self</span>.locs.len() - <span class="self">self</span>.idx; |
| (len, <span class="prelude-val">Some</span>(len)) |
| } |
| |
| <span class="kw">fn </span>count(<span class="self">self</span>) -> usize { |
| <span class="self">self</span>.len() |
| } |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'c</span>> ExactSizeIterator <span class="kw">for </span>SubCapturesPosIter<<span class="lifetime">'c</span>> {} |
| |
| <span class="kw">impl</span><<span class="lifetime">'c</span>> FusedIterator <span class="kw">for </span>SubCapturesPosIter<<span class="lifetime">'c</span>> {} |
| |
| <span class="doccomment">/// `RegularExpression` describes types that can implement regex searching. |
| /// |
| /// This trait is my attempt at reducing code duplication and to standardize |
| /// the internal API. Specific duplication that is avoided are the `find` |
| /// and `capture` iterators, which are slightly tricky. |
| /// |
| /// It's not clear whether this trait is worth it, and it also isn't |
| /// clear whether it's useful as a public trait or not. Methods like |
| /// `next_after_empty` reak of bad design, but the rest of the methods seem |
| /// somewhat reasonable. One particular thing this trait would expose would be |
| /// the ability to start the search of a regex anywhere in a haystack, which |
| /// isn't possible in the current public API. |
| </span><span class="kw">pub trait </span>RegularExpression: Sized + fmt::Debug { |
| <span class="doccomment">/// The type of the haystack. |
| </span><span class="kw">type </span>Text: <span class="question-mark">?</span>Sized + fmt::Debug; |
| |
| <span class="doccomment">/// The number of capture slots in the compiled regular expression. This is |
| /// always two times the number of capture groups (two slots per group). |
| </span><span class="kw">fn </span>slots_len(<span class="kw-2">&</span><span class="self">self</span>) -> usize; |
| |
| <span class="doccomment">/// Allocates fresh space for all capturing groups in this regex. |
| </span><span class="kw">fn </span>locations(<span class="kw-2">&</span><span class="self">self</span>) -> Locations { |
| Locations(<span class="macro">vec!</span>[<span class="prelude-val">None</span>; <span class="self">self</span>.slots_len()]) |
| } |
| |
| <span class="doccomment">/// Returns the position of the next character after `i`. |
| /// |
| /// For example, a haystack with type `&[u8]` probably returns `i+1`, |
| /// whereas a haystack with type `&str` probably returns `i` plus the |
| /// length of the next UTF-8 sequence. |
| </span><span class="kw">fn </span>next_after_empty(<span class="kw-2">&</span><span class="self">self</span>, text: <span class="kw-2">&</span><span class="self">Self</span>::Text, i: usize) -> usize; |
| |
| <span class="doccomment">/// Returns the location of the shortest match. |
| </span><span class="kw">fn </span>shortest_match_at( |
| <span class="kw-2">&</span><span class="self">self</span>, |
| text: <span class="kw-2">&</span><span class="self">Self</span>::Text, |
| start: usize, |
| ) -> <span class="prelude-ty">Option</span><usize>; |
| |
| <span class="doccomment">/// Returns whether the regex matches the text given. |
| </span><span class="kw">fn </span>is_match_at(<span class="kw-2">&</span><span class="self">self</span>, text: <span class="kw-2">&</span><span class="self">Self</span>::Text, start: usize) -> bool; |
| |
| <span class="doccomment">/// Returns the leftmost-first match location if one exists. |
| </span><span class="kw">fn </span>find_at( |
| <span class="kw-2">&</span><span class="self">self</span>, |
| text: <span class="kw-2">&</span><span class="self">Self</span>::Text, |
| start: usize, |
| ) -> <span class="prelude-ty">Option</span><(usize, usize)>; |
| |
| <span class="doccomment">/// Returns the leftmost-first match location if one exists, and also |
| /// fills in any matching capture slot locations. |
| </span><span class="kw">fn </span>captures_read_at( |
| <span class="kw-2">&</span><span class="self">self</span>, |
| locs: <span class="kw-2">&mut </span>Locations, |
| text: <span class="kw-2">&</span><span class="self">Self</span>::Text, |
| start: usize, |
| ) -> <span class="prelude-ty">Option</span><(usize, usize)>; |
| |
| <span class="doccomment">/// Returns an iterator over all non-overlapping successive leftmost-first |
| /// matches. |
| </span><span class="kw">fn </span>find_iter(<span class="self">self</span>, text: <span class="kw-2">&</span><span class="self">Self</span>::Text) -> Matches<<span class="lifetime">'_</span>, <span class="self">Self</span>> { |
| Matches { re: <span class="self">self</span>, text, last_end: <span class="number">0</span>, last_match: <span class="prelude-val">None </span>} |
| } |
| |
| <span class="doccomment">/// Returns an iterator over all non-overlapping successive leftmost-first |
| /// matches with captures. |
| </span><span class="kw">fn </span>captures_iter(<span class="self">self</span>, text: <span class="kw-2">&</span><span class="self">Self</span>::Text) -> CaptureMatches<<span class="lifetime">'_</span>, <span class="self">Self</span>> { |
| CaptureMatches(<span class="self">self</span>.find_iter(text)) |
| } |
| } |
| |
| <span class="doccomment">/// An iterator over all non-overlapping successive leftmost-first matches. |
| </span><span class="attribute">#[derive(Debug)] |
| </span><span class="kw">pub struct </span>Matches<<span class="lifetime">'t</span>, R> |
| <span class="kw">where |
| </span>R: RegularExpression, |
| R::Text: <span class="lifetime">'t</span>, |
| { |
| re: R, |
| text: <span class="kw-2">&</span><span class="lifetime">'t </span>R::Text, |
| last_end: usize, |
| last_match: <span class="prelude-ty">Option</span><usize>, |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'t</span>, R> Matches<<span class="lifetime">'t</span>, R> |
| <span class="kw">where |
| </span>R: RegularExpression, |
| R::Text: <span class="lifetime">'t</span>, |
| { |
| <span class="doccomment">/// Return the text being searched. |
| </span><span class="kw">pub fn </span>text(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span><span class="lifetime">'t </span>R::Text { |
| <span class="self">self</span>.text |
| } |
| |
| <span class="doccomment">/// Return the underlying regex. |
| </span><span class="kw">pub fn </span>regex(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span>R { |
| <span class="kw-2">&</span><span class="self">self</span>.re |
| } |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'t</span>, R> Iterator <span class="kw">for </span>Matches<<span class="lifetime">'t</span>, R> |
| <span class="kw">where |
| </span>R: RegularExpression, |
| R::Text: <span class="lifetime">'t </span>+ AsRef<[u8]>, |
| { |
| <span class="kw">type </span>Item = (usize, usize); |
| |
| <span class="kw">fn </span>next(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><(usize, usize)> { |
| <span class="kw">if </span><span class="self">self</span>.last_end > <span class="self">self</span>.text.as_ref().len() { |
| <span class="kw">return </span><span class="prelude-val">None</span>; |
| } |
| <span class="kw">let </span>(s, e) = <span class="kw">match </span><span class="self">self</span>.re.find_at(<span class="self">self</span>.text, <span class="self">self</span>.last_end) { |
| <span class="prelude-val">None </span>=> <span class="kw">return </span><span class="prelude-val">None</span>, |
| <span class="prelude-val">Some</span>((s, e)) => (s, e), |
| }; |
| <span class="kw">if </span>s == e { |
| <span class="comment">// This is an empty match. To ensure we make progress, start |
| // the next search at the smallest possible starting position |
| // of the next match following this one. |
| </span><span class="self">self</span>.last_end = <span class="self">self</span>.re.next_after_empty(<span class="self">self</span>.text, e); |
| <span class="comment">// Don't accept empty matches immediately following a match. |
| // Just move on to the next match. |
| </span><span class="kw">if </span><span class="prelude-val">Some</span>(e) == <span class="self">self</span>.last_match { |
| <span class="kw">return </span><span class="self">self</span>.next(); |
| } |
| } <span class="kw">else </span>{ |
| <span class="self">self</span>.last_end = e; |
| } |
| <span class="self">self</span>.last_match = <span class="prelude-val">Some</span>(e); |
| <span class="prelude-val">Some</span>((s, e)) |
| } |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'t</span>, R> FusedIterator <span class="kw">for </span>Matches<<span class="lifetime">'t</span>, R> |
| <span class="kw">where |
| </span>R: RegularExpression, |
| R::Text: <span class="lifetime">'t </span>+ AsRef<[u8]>, |
| { |
| } |
| |
| <span class="doccomment">/// An iterator over all non-overlapping successive leftmost-first matches with |
| /// captures. |
| </span><span class="attribute">#[derive(Debug)] |
| </span><span class="kw">pub struct </span>CaptureMatches<<span class="lifetime">'t</span>, R>(Matches<<span class="lifetime">'t</span>, R>) |
| <span class="kw">where |
| </span>R: RegularExpression, |
| R::Text: <span class="lifetime">'t</span>; |
| |
| <span class="kw">impl</span><<span class="lifetime">'t</span>, R> CaptureMatches<<span class="lifetime">'t</span>, R> |
| <span class="kw">where |
| </span>R: RegularExpression, |
| R::Text: <span class="lifetime">'t</span>, |
| { |
| <span class="doccomment">/// Return the text being searched. |
| </span><span class="kw">pub fn </span>text(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span><span class="lifetime">'t </span>R::Text { |
| <span class="self">self</span>.<span class="number">0</span>.text() |
| } |
| |
| <span class="doccomment">/// Return the underlying regex. |
| </span><span class="kw">pub fn </span>regex(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span>R { |
| <span class="self">self</span>.<span class="number">0</span>.regex() |
| } |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'t</span>, R> Iterator <span class="kw">for </span>CaptureMatches<<span class="lifetime">'t</span>, R> |
| <span class="kw">where |
| </span>R: RegularExpression, |
| R::Text: <span class="lifetime">'t </span>+ AsRef<[u8]>, |
| { |
| <span class="kw">type </span>Item = Locations; |
| |
| <span class="kw">fn </span>next(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><Locations> { |
| <span class="kw">if </span><span class="self">self</span>.<span class="number">0</span>.last_end > <span class="self">self</span>.<span class="number">0</span>.text.as_ref().len() { |
| <span class="kw">return </span><span class="prelude-val">None</span>; |
| } |
| <span class="kw">let </span><span class="kw-2">mut </span>locs = <span class="self">self</span>.<span class="number">0</span>.re.locations(); |
| <span class="kw">let </span>(s, e) = <span class="kw">match </span><span class="self">self</span>.<span class="number">0</span>.re.captures_read_at( |
| <span class="kw-2">&mut </span>locs, |
| <span class="self">self</span>.<span class="number">0</span>.text, |
| <span class="self">self</span>.<span class="number">0</span>.last_end, |
| ) { |
| <span class="prelude-val">None </span>=> <span class="kw">return </span><span class="prelude-val">None</span>, |
| <span class="prelude-val">Some</span>((s, e)) => (s, e), |
| }; |
| <span class="kw">if </span>s == e { |
| <span class="self">self</span>.<span class="number">0</span>.last_end = <span class="self">self</span>.<span class="number">0</span>.re.next_after_empty(<span class="self">self</span>.<span class="number">0</span>.text, e); |
| <span class="kw">if </span><span class="prelude-val">Some</span>(e) == <span class="self">self</span>.<span class="number">0</span>.last_match { |
| <span class="kw">return </span><span class="self">self</span>.next(); |
| } |
| } <span class="kw">else </span>{ |
| <span class="self">self</span>.<span class="number">0</span>.last_end = e; |
| } |
| <span class="self">self</span>.<span class="number">0</span>.last_match = <span class="prelude-val">Some</span>(e); |
| <span class="prelude-val">Some</span>(locs) |
| } |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'t</span>, R> FusedIterator <span class="kw">for </span>CaptureMatches<<span class="lifetime">'t</span>, R> |
| <span class="kw">where |
| </span>R: RegularExpression, |
| R::Text: <span class="lifetime">'t </span>+ AsRef<[u8]>, |
| { |
| } |
| </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> |
