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| </pre><pre class="rust "> |
| <span class="comment">// Copyright 2014-2015 The Rust Project Developers. See the COPYRIGHT</span> |
| <span class="comment">// file at the top-level directory of this distribution and at</span> |
| <span class="comment">// http://rust-lang.org/COPYRIGHT.</span> |
| <span class="comment">//</span> |
| <span class="comment">// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or</span> |
| <span class="comment">// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license</span> |
| <span class="comment">// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your</span> |
| <span class="comment">// option. This file may not be copied, modified, or distributed</span> |
| <span class="comment">// except according to those terms.</span> |
| |
| <span class="doccomment">/// Slot is a single saved capture location. Note that there are two slots for</span> |
| <span class="doccomment">/// every capture in a regular expression (one slot each for the start and end</span> |
| <span class="doccomment">/// of the capture).</span> |
| <span class="kw">pub</span> <span class="kw">type</span> <span class="ident">Slot</span> <span class="op">=</span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span>; |
| |
| <span class="doccomment">/// RegularExpression describes types that can implement regex searching.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// This trait is my attempt at reducing code duplication and to standardize</span> |
| <span class="doccomment">/// the internal API. Specific duplication that is avoided are the `find`</span> |
| <span class="doccomment">/// and `capture` iterators, which are slightly tricky.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// It's not clear whether this trait is worth it, and it also isn't</span> |
| <span class="doccomment">/// clear whether it's useful as a public trait or not. Methods like</span> |
| <span class="doccomment">/// `next_after_empty` reak of bad design, but the rest of the methods seem</span> |
| <span class="doccomment">/// somewhat reasonable. One particular thing this trait would expose would be</span> |
| <span class="doccomment">/// the ability to start the search of a regex anywhere in a haystack, which</span> |
| <span class="doccomment">/// isn't possible in the current public API.</span> |
| <span class="kw">pub</span> <span class="kw">trait</span> <span class="ident">RegularExpression</span>: <span class="ident">Sized</span> { |
| <span class="doccomment">/// The type of the haystack.</span> |
| <span class="kw">type</span> <span class="ident">Text</span>: <span class="question-mark">?</span><span class="ident">Sized</span>; |
| |
| <span class="doccomment">/// The number of capture slots in the compiled regular expression. This is</span> |
| <span class="doccomment">/// always two times the number of capture groups (two slots per group).</span> |
| <span class="kw">fn</span> <span class="ident">slots_len</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">usize</span>; |
| |
| <span class="doccomment">/// Returns the position of the next character after `i`.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// For example, a haystack with type `&[u8]` probably returns `i+1`,</span> |
| <span class="doccomment">/// whereas a haystack with type `&str` probably returns `i` plus the</span> |
| <span class="doccomment">/// length of the next UTF-8 sequence.</span> |
| <span class="kw">fn</span> <span class="ident">next_after_empty</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">text</span>: <span class="kw-2">&</span><span class="self">Self</span>::<span class="ident">Text</span>, <span class="ident">i</span>: <span class="ident">usize</span>) <span class="op">-></span> <span class="ident">usize</span>; |
| |
| <span class="doccomment">/// Returns the location of the shortest match.</span> |
| <span class="kw">fn</span> <span class="ident">shortest_match_at</span>( |
| <span class="kw-2">&</span><span class="self">self</span>, |
| <span class="ident">text</span>: <span class="kw-2">&</span><span class="self">Self</span>::<span class="ident">Text</span>, |
| <span class="ident">start</span>: <span class="ident">usize</span>, |
| ) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span>; |
| |
| <span class="doccomment">/// Returns whether the regex matches the text given.</span> |
| <span class="kw">fn</span> <span class="ident">is_match_at</span>( |
| <span class="kw-2">&</span><span class="self">self</span>, |
| <span class="ident">text</span>: <span class="kw-2">&</span><span class="self">Self</span>::<span class="ident">Text</span>, |
| <span class="ident">start</span>: <span class="ident">usize</span>, |
| ) <span class="op">-></span> <span class="ident">bool</span>; |
| |
| <span class="doccomment">/// Returns the leftmost-first match location if one exists.</span> |
| <span class="kw">fn</span> <span class="ident">find_at</span>( |
| <span class="kw-2">&</span><span class="self">self</span>, |
| <span class="ident">text</span>: <span class="kw-2">&</span><span class="self">Self</span>::<span class="ident">Text</span>, |
| <span class="ident">start</span>: <span class="ident">usize</span>, |
| ) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span>(<span class="ident">usize</span>, <span class="ident">usize</span>)<span class="op">></span>; |
| |
| <span class="doccomment">/// Returns the leftmost-first match location if one exists, and also</span> |
| <span class="doccomment">/// fills in any matching capture slot locations.</span> |
| <span class="kw">fn</span> <span class="ident">read_captures_at</span>( |
| <span class="kw-2">&</span><span class="self">self</span>, |
| <span class="ident">slots</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> [<span class="ident">Slot</span>], |
| <span class="ident">text</span>: <span class="kw-2">&</span><span class="self">Self</span>::<span class="ident">Text</span>, |
| <span class="ident">start</span>: <span class="ident">usize</span>, |
| ) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span>(<span class="ident">usize</span>, <span class="ident">usize</span>)<span class="op">></span>; |
| |
| <span class="doccomment">/// Returns an iterator over all non-overlapping successive leftmost-first</span> |
| <span class="doccomment">/// matches.</span> |
| <span class="kw">fn</span> <span class="ident">find_iter</span><span class="op"><</span><span class="lifetime">'t</span><span class="op">></span>( |
| <span class="self">self</span>, |
| <span class="ident">text</span>: <span class="kw-2">&</span><span class="lifetime">'t</span> <span class="self">Self</span>::<span class="ident">Text</span>, |
| ) <span class="op">-></span> <span class="ident">FindMatches</span><span class="op"><</span><span class="lifetime">'t</span>, <span class="self">Self</span><span class="op">></span> { |
| <span class="ident">FindMatches</span> { |
| <span class="ident">re</span>: <span class="self">self</span>, |
| <span class="ident">text</span>: <span class="ident">text</span>, |
| <span class="ident">last_end</span>: <span class="number">0</span>, |
| <span class="ident">last_match</span>: <span class="prelude-val">None</span>, |
| } |
| } |
| |
| <span class="doccomment">/// Returns an iterator over all non-overlapping successive leftmost-first</span> |
| <span class="doccomment">/// matches with captures.</span> |
| <span class="kw">fn</span> <span class="ident">captures_iter</span><span class="op"><</span><span class="lifetime">'t</span><span class="op">></span>( |
| <span class="self">self</span>, |
| <span class="ident">text</span>: <span class="kw-2">&</span><span class="lifetime">'t</span> <span class="self">Self</span>::<span class="ident">Text</span>, |
| ) <span class="op">-></span> <span class="ident">FindCaptures</span><span class="op"><</span><span class="lifetime">'t</span>, <span class="self">Self</span><span class="op">></span> { |
| <span class="ident">FindCaptures</span>(<span class="self">self</span>.<span class="ident">find_iter</span>(<span class="ident">text</span>)) |
| } |
| } |
| |
| <span class="doccomment">/// An iterator over all non-overlapping successive leftmost-first matches.</span> |
| <span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">FindMatches</span><span class="op"><</span><span class="lifetime">'t</span>, <span class="ident">R</span><span class="op">></span> <span class="kw">where</span> <span class="ident">R</span>: <span class="ident">RegularExpression</span>, <span class="ident">R</span>::<span class="ident">Text</span>: <span class="lifetime">'t</span> { |
| <span class="ident">re</span>: <span class="ident">R</span>, |
| <span class="ident">text</span>: <span class="kw-2">&</span><span class="lifetime">'t</span> <span class="ident">R</span>::<span class="ident">Text</span>, |
| <span class="ident">last_end</span>: <span class="ident">usize</span>, |
| <span class="ident">last_match</span>: <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span>, |
| } |
| |
| <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'t</span>, <span class="ident">R</span><span class="op">></span> <span class="ident">FindMatches</span><span class="op"><</span><span class="lifetime">'t</span>, <span class="ident">R</span><span class="op">></span> <span class="kw">where</span> <span class="ident">R</span>: <span class="ident">RegularExpression</span>, <span class="ident">R</span>::<span class="ident">Text</span>: <span class="lifetime">'t</span> { |
| <span class="doccomment">/// Return the text being searched.</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">text</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="lifetime">'t</span> <span class="ident">R</span>::<span class="ident">Text</span> { |
| <span class="self">self</span>.<span class="ident">text</span> |
| } |
| |
| <span class="doccomment">/// Return the underlying regex.</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">regex</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="ident">R</span> { |
| <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">re</span> |
| } |
| } |
| |
| <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'t</span>, <span class="ident">R</span><span class="op">></span> <span class="ident">Iterator</span> <span class="kw">for</span> <span class="ident">FindMatches</span><span class="op"><</span><span class="lifetime">'t</span>, <span class="ident">R</span><span class="op">></span> |
| <span class="kw">where</span> <span class="ident">R</span>: <span class="ident">RegularExpression</span>, <span class="ident">R</span>::<span class="ident">Text</span>: <span class="lifetime">'t</span> <span class="op">+</span> <span class="ident">AsRef</span><span class="op"><</span>[<span class="ident">u8</span>]<span class="op">></span> { |
| <span class="kw">type</span> <span class="ident">Item</span> <span class="op">=</span> (<span class="ident">usize</span>, <span class="ident">usize</span>); |
| |
| <span class="kw">fn</span> <span class="ident">next</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span>(<span class="ident">usize</span>, <span class="ident">usize</span>)<span class="op">></span> { |
| <span class="kw">if</span> <span class="self">self</span>.<span class="ident">last_end</span> <span class="op">></span> <span class="self">self</span>.<span class="ident">text</span>.<span class="ident">as_ref</span>().<span class="ident">len</span>() { |
| <span class="kw">return</span> <span class="prelude-val">None</span>; |
| } |
| <span class="kw">let</span> (<span class="ident">s</span>, <span class="ident">e</span>) <span class="op">=</span> <span class="kw">match</span> <span class="self">self</span>.<span class="ident">re</span>.<span class="ident">find_at</span>(<span class="self">self</span>.<span class="ident">text</span>, <span class="self">self</span>.<span class="ident">last_end</span>) { |
| <span class="prelude-val">None</span> <span class="op">=></span> <span class="kw">return</span> <span class="prelude-val">None</span>, |
| <span class="prelude-val">Some</span>((<span class="ident">s</span>, <span class="ident">e</span>)) <span class="op">=></span> (<span class="ident">s</span>, <span class="ident">e</span>), |
| }; |
| <span class="kw">if</span> <span class="ident">s</span> <span class="op">==</span> <span class="ident">e</span> { |
| <span class="comment">// This is an empty match. To ensure we make progress, start</span> |
| <span class="comment">// the next search at the smallest possible starting position</span> |
| <span class="comment">// of the next match following this one.</span> |
| <span class="self">self</span>.<span class="ident">last_end</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">re</span>.<span class="ident">next_after_empty</span>(<span class="kw-2">&</span><span class="self">self</span>.<span class="ident">text</span>, <span class="ident">e</span>); |
| <span class="comment">// Don't accept empty matches immediately following a match.</span> |
| <span class="comment">// Just move on to the next match.</span> |
| <span class="kw">if</span> <span class="prelude-val">Some</span>(<span class="ident">e</span>) <span class="op">==</span> <span class="self">self</span>.<span class="ident">last_match</span> { |
| <span class="kw">return</span> <span class="self">self</span>.<span class="ident">next</span>(); |
| } |
| } <span class="kw">else</span> { |
| <span class="self">self</span>.<span class="ident">last_end</span> <span class="op">=</span> <span class="ident">e</span>; |
| } |
| <span class="self">self</span>.<span class="ident">last_match</span> <span class="op">=</span> <span class="prelude-val">Some</span>(<span class="ident">e</span>); |
| <span class="prelude-val">Some</span>((<span class="ident">s</span>, <span class="ident">e</span>)) |
| } |
| } |
| |
| <span class="doccomment">/// An iterator over all non-overlapping successive leftmost-first matches with</span> |
| <span class="doccomment">/// captures.</span> |
| <span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">FindCaptures</span><span class="op"><</span><span class="lifetime">'t</span>, <span class="ident">R</span><span class="op">></span>(<span class="ident">FindMatches</span><span class="op"><</span><span class="lifetime">'t</span>, <span class="ident">R</span><span class="op">></span>) |
| <span class="kw">where</span> <span class="ident">R</span>: <span class="ident">RegularExpression</span>, <span class="ident">R</span>::<span class="ident">Text</span>: <span class="lifetime">'t</span>; |
| |
| <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'t</span>, <span class="ident">R</span><span class="op">></span> <span class="ident">FindCaptures</span><span class="op"><</span><span class="lifetime">'t</span>, <span class="ident">R</span><span class="op">></span> <span class="kw">where</span> <span class="ident">R</span>: <span class="ident">RegularExpression</span>, <span class="ident">R</span>::<span class="ident">Text</span>: <span class="lifetime">'t</span> { |
| <span class="doccomment">/// Return the text being searched.</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">text</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="lifetime">'t</span> <span class="ident">R</span>::<span class="ident">Text</span> { |
| <span class="self">self</span>.<span class="number">0</span>.<span class="ident">text</span>() |
| } |
| |
| <span class="doccomment">/// Return the underlying regex.</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">regex</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="ident">R</span> { |
| <span class="self">self</span>.<span class="number">0</span>.<span class="ident">regex</span>() |
| } |
| } |
| |
| <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'t</span>, <span class="ident">R</span><span class="op">></span> <span class="ident">Iterator</span> <span class="kw">for</span> <span class="ident">FindCaptures</span><span class="op"><</span><span class="lifetime">'t</span>, <span class="ident">R</span><span class="op">></span> |
| <span class="kw">where</span> <span class="ident">R</span>: <span class="ident">RegularExpression</span>, <span class="ident">R</span>::<span class="ident">Text</span>: <span class="lifetime">'t</span> <span class="op">+</span> <span class="ident">AsRef</span><span class="op"><</span>[<span class="ident">u8</span>]<span class="op">></span> { |
| <span class="kw">type</span> <span class="ident">Item</span> <span class="op">=</span> <span class="ident">Vec</span><span class="op"><</span><span class="ident">Slot</span><span class="op">></span>; |
| |
| <span class="kw">fn</span> <span class="ident">next</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">Vec</span><span class="op"><</span><span class="ident">Slot</span><span class="op">>></span> { |
| <span class="kw">if</span> <span class="self">self</span>.<span class="number">0</span>.<span class="ident">last_end</span> <span class="op">></span> <span class="self">self</span>.<span class="number">0</span>.<span class="ident">text</span>.<span class="ident">as_ref</span>().<span class="ident">len</span>() { |
| <span class="kw">return</span> <span class="prelude-val">None</span> |
| } |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">slots</span> <span class="op">=</span> <span class="macro">vec</span><span class="macro">!</span>[<span class="prelude-val">None</span>; <span class="self">self</span>.<span class="number">0</span>.<span class="ident">re</span>.<span class="ident">slots_len</span>()]; |
| <span class="kw">let</span> (<span class="ident">s</span>, <span class="ident">e</span>) <span class="op">=</span> <span class="kw">match</span> <span class="self">self</span>.<span class="number">0</span>.<span class="ident">re</span>.<span class="ident">read_captures_at</span>( |
| <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">slots</span>, |
| <span class="self">self</span>.<span class="number">0</span>.<span class="ident">text</span>, |
| <span class="self">self</span>.<span class="number">0</span>.<span class="ident">last_end</span>, |
| ) { |
| <span class="prelude-val">None</span> <span class="op">=></span> <span class="kw">return</span> <span class="prelude-val">None</span>, |
| <span class="prelude-val">Some</span>((<span class="ident">s</span>, <span class="ident">e</span>)) <span class="op">=></span> (<span class="ident">s</span>, <span class="ident">e</span>), |
| }; |
| <span class="kw">if</span> <span class="ident">s</span> <span class="op">==</span> <span class="ident">e</span> { |
| <span class="self">self</span>.<span class="number">0</span>.<span class="ident">last_end</span> <span class="op">=</span> <span class="self">self</span>.<span class="number">0</span>.<span class="ident">re</span>.<span class="ident">next_after_empty</span>(<span class="kw-2">&</span><span class="self">self</span>.<span class="number">0</span>.<span class="ident">text</span>, <span class="ident">e</span>); |
| <span class="kw">if</span> <span class="prelude-val">Some</span>(<span class="ident">e</span>) <span class="op">==</span> <span class="self">self</span>.<span class="number">0</span>.<span class="ident">last_match</span> { |
| <span class="kw">return</span> <span class="self">self</span>.<span class="ident">next</span>(); |
| } |
| } <span class="kw">else</span> { |
| <span class="self">self</span>.<span class="number">0</span>.<span class="ident">last_end</span> <span class="op">=</span> <span class="ident">e</span>; |
| } |
| <span class="self">self</span>.<span class="number">0</span>.<span class="ident">last_match</span> <span class="op">=</span> <span class="prelude-val">Some</span>(<span class="ident">e</span>); |
| <span class="prelude-val">Some</span>(<span class="ident">slots</span>) |
| } |
| } |
| </pre> |
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