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| <section id='main' class="content"><pre class="line-numbers"><span id="1"> 1</span> |
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| <span id="425">425</span> |
| </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="kw">use</span> <span class="ident">std</span>::<span class="ident">char</span>; |
| <span class="kw">use</span> <span class="ident">std</span>::<span class="ident">cmp</span>::<span class="ident">Ordering</span>; |
| <span class="kw">use</span> <span class="ident">std</span>::<span class="ident">fmt</span>; |
| <span class="kw">use</span> <span class="ident">std</span>::<span class="ident">ops</span>; |
| <span class="kw">use</span> <span class="ident">std</span>::<span class="ident">u32</span>; |
| |
| <span class="kw">use</span> <span class="ident">syntax</span>; |
| |
| <span class="kw">use</span> <span class="ident">literals</span>::<span class="ident">LiteralSearcher</span>; |
| <span class="kw">use</span> <span class="ident">prog</span>::<span class="ident">InstEmptyLook</span>; |
| <span class="kw">use</span> <span class="ident">utf8</span>::{<span class="ident">decode_utf8</span>, <span class="ident">decode_last_utf8</span>}; |
| |
| <span class="doccomment">/// Represents a location in the input.</span> |
| <span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Clone</span>, <span class="ident">Copy</span>, <span class="ident">Debug</span>)]</span> |
| <span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">InputAt</span> { |
| <span class="ident">pos</span>: <span class="ident">usize</span>, |
| <span class="ident">c</span>: <span class="ident">Char</span>, |
| <span class="ident">byte</span>: <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">u8</span><span class="op">></span>, |
| <span class="ident">len</span>: <span class="ident">usize</span>, |
| } |
| |
| <span class="kw">impl</span> <span class="ident">InputAt</span> { |
| <span class="doccomment">/// Returns true iff this position is at the beginning of the input.</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">is_start</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">bool</span> { |
| <span class="self">self</span>.<span class="ident">pos</span> <span class="op">==</span> <span class="number">0</span> |
| } |
| |
| <span class="doccomment">/// Returns true iff this position is past the end of the input.</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">is_end</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">bool</span> { |
| <span class="self">self</span>.<span class="ident">c</span>.<span class="ident">is_none</span>() <span class="op">&&</span> <span class="self">self</span>.<span class="ident">byte</span>.<span class="ident">is_none</span>() |
| } |
| |
| <span class="doccomment">/// Returns the character at this position.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// If this position is just before or after the input, then an absent</span> |
| <span class="doccomment">/// character is returned.</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">char</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">Char</span> { |
| <span class="self">self</span>.<span class="ident">c</span> |
| } |
| |
| <span class="doccomment">/// Returns the byte at this position.</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">byte</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">u8</span><span class="op">></span> { |
| <span class="self">self</span>.<span class="ident">byte</span> |
| } |
| |
| <span class="doccomment">/// Returns the UTF-8 width of the character at this position.</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">len</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">usize</span> { |
| <span class="self">self</span>.<span class="ident">len</span> |
| } |
| |
| <span class="doccomment">/// Returns the byte offset of this position.</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">pos</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">usize</span> { |
| <span class="self">self</span>.<span class="ident">pos</span> |
| } |
| |
| <span class="doccomment">/// Returns the byte offset of the next position in the input.</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">next_pos</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">usize</span> { |
| <span class="self">self</span>.<span class="ident">pos</span> <span class="op">+</span> <span class="self">self</span>.<span class="ident">len</span> |
| } |
| } |
| |
| <span class="doccomment">/// An abstraction over input used in the matching engines.</span> |
| <span class="kw">pub</span> <span class="kw">trait</span> <span class="ident">Input</span> { |
| <span class="doccomment">/// Return an encoding of the position at byte offset `i`.</span> |
| <span class="kw">fn</span> <span class="ident">at</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">i</span>: <span class="ident">usize</span>) <span class="op">-></span> <span class="ident">InputAt</span>; |
| |
| <span class="doccomment">/// Return the Unicode character occurring next to `at`.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// If no such character could be decoded, then `Char` is absent.</span> |
| <span class="kw">fn</span> <span class="ident">next_char</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">at</span>: <span class="ident">InputAt</span>) <span class="op">-></span> <span class="ident">Char</span>; |
| |
| <span class="doccomment">/// Return the Unicode character occurring previous to `at`.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// If no such character could be decoded, then `Char` is absent.</span> |
| <span class="kw">fn</span> <span class="ident">previous_char</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">at</span>: <span class="ident">InputAt</span>) <span class="op">-></span> <span class="ident">Char</span>; |
| |
| <span class="doccomment">/// Return true if the given empty width instruction matches at the</span> |
| <span class="doccomment">/// input position given.</span> |
| <span class="kw">fn</span> <span class="ident">is_empty_match</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">at</span>: <span class="ident">InputAt</span>, <span class="ident">empty</span>: <span class="kw-2">&</span><span class="ident">InstEmptyLook</span>) <span class="op">-></span> <span class="ident">bool</span>; |
| |
| <span class="doccomment">/// Scan the input for a matching prefix.</span> |
| <span class="kw">fn</span> <span class="ident">prefix_at</span>( |
| <span class="kw-2">&</span><span class="self">self</span>, |
| <span class="ident">prefixes</span>: <span class="kw-2">&</span><span class="ident">LiteralSearcher</span>, |
| <span class="ident">at</span>: <span class="ident">InputAt</span>, |
| ) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">InputAt</span><span class="op">></span>; |
| |
| <span class="doccomment">/// The number of bytes in the input.</span> |
| <span class="kw">fn</span> <span class="ident">len</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">usize</span>; |
| |
| <span class="doccomment">/// Return the given input as a sequence of bytes.</span> |
| <span class="kw">fn</span> <span class="ident">as_bytes</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="kw-2">&</span>[<span class="ident">u8</span>]; |
| } |
| |
| <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>: <span class="ident">Input</span><span class="op">></span> <span class="ident">Input</span> <span class="kw">for</span> <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">T</span> { |
| <span class="kw">fn</span> <span class="ident">at</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">i</span>: <span class="ident">usize</span>) <span class="op">-></span> <span class="ident">InputAt</span> { (<span class="kw-2">*</span><span class="kw-2">*</span><span class="self">self</span>).<span class="ident">at</span>(<span class="ident">i</span>) } |
| |
| <span class="kw">fn</span> <span class="ident">next_char</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">at</span>: <span class="ident">InputAt</span>) <span class="op">-></span> <span class="ident">Char</span> { (<span class="kw-2">*</span><span class="kw-2">*</span><span class="self">self</span>).<span class="ident">next_char</span>(<span class="ident">at</span>) } |
| |
| <span class="kw">fn</span> <span class="ident">previous_char</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">at</span>: <span class="ident">InputAt</span>) <span class="op">-></span> <span class="ident">Char</span> { (<span class="kw-2">*</span><span class="kw-2">*</span><span class="self">self</span>).<span class="ident">previous_char</span>(<span class="ident">at</span>) } |
| |
| <span class="kw">fn</span> <span class="ident">is_empty_match</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">at</span>: <span class="ident">InputAt</span>, <span class="ident">empty</span>: <span class="kw-2">&</span><span class="ident">InstEmptyLook</span>) <span class="op">-></span> <span class="ident">bool</span> { |
| (<span class="kw-2">*</span><span class="kw-2">*</span><span class="self">self</span>).<span class="ident">is_empty_match</span>(<span class="ident">at</span>, <span class="ident">empty</span>) |
| } |
| |
| <span class="kw">fn</span> <span class="ident">prefix_at</span>( |
| <span class="kw-2">&</span><span class="self">self</span>, |
| <span class="ident">prefixes</span>: <span class="kw-2">&</span><span class="ident">LiteralSearcher</span>, |
| <span class="ident">at</span>: <span class="ident">InputAt</span>, |
| ) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">InputAt</span><span class="op">></span> { |
| (<span class="kw-2">*</span><span class="kw-2">*</span><span class="self">self</span>).<span class="ident">prefix_at</span>(<span class="ident">prefixes</span>, <span class="ident">at</span>) |
| } |
| |
| <span class="kw">fn</span> <span class="ident">len</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">usize</span> { (<span class="kw-2">*</span><span class="kw-2">*</span><span class="self">self</span>).<span class="ident">len</span>() } |
| |
| <span class="kw">fn</span> <span class="ident">as_bytes</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="kw-2">&</span>[<span class="ident">u8</span>] { (<span class="kw-2">*</span><span class="kw-2">*</span><span class="self">self</span>).<span class="ident">as_bytes</span>() } |
| } |
| |
| <span class="doccomment">/// An input reader over characters.</span> |
| <span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Clone</span>, <span class="ident">Copy</span>, <span class="ident">Debug</span>)]</span> |
| <span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">CharInput</span><span class="op"><</span><span class="lifetime">'t</span><span class="op">></span>(<span class="kw-2">&</span><span class="lifetime">'t</span> [<span class="ident">u8</span>]); |
| |
| <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'t</span><span class="op">></span> <span class="ident">CharInput</span><span class="op"><</span><span class="lifetime">'t</span><span class="op">></span> { |
| <span class="doccomment">/// Return a new character input reader for the given string.</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new</span>(<span class="ident">s</span>: <span class="kw-2">&</span><span class="lifetime">'t</span> [<span class="ident">u8</span>]) <span class="op">-></span> <span class="ident">CharInput</span><span class="op"><</span><span class="lifetime">'t</span><span class="op">></span> { |
| <span class="ident">CharInput</span>(<span class="ident">s</span>) |
| } |
| } |
| |
| <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'t</span><span class="op">></span> <span class="ident">ops</span>::<span class="ident">Deref</span> <span class="kw">for</span> <span class="ident">CharInput</span><span class="op"><</span><span class="lifetime">'t</span><span class="op">></span> { |
| <span class="kw">type</span> <span class="ident">Target</span> <span class="op">=</span> [<span class="ident">u8</span>]; |
| |
| <span class="kw">fn</span> <span class="ident">deref</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="kw-2">&</span>[<span class="ident">u8</span>] { |
| <span class="self">self</span>.<span class="number">0</span> |
| } |
| } |
| |
| <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'t</span><span class="op">></span> <span class="ident">Input</span> <span class="kw">for</span> <span class="ident">CharInput</span><span class="op"><</span><span class="lifetime">'t</span><span class="op">></span> { |
| <span class="kw">fn</span> <span class="ident">at</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">i</span>: <span class="ident">usize</span>) <span class="op">-></span> <span class="ident">InputAt</span> { |
| <span class="kw">let</span> <span class="ident">c</span> <span class="op">=</span> <span class="ident">decode_utf8</span>(<span class="kw-2">&</span><span class="self">self</span>[<span class="ident">i</span>..]).<span class="ident">map</span>(<span class="op">|</span>(<span class="ident">c</span>, _)<span class="op">|</span> <span class="ident">c</span>).<span class="ident">into</span>(); |
| <span class="ident">InputAt</span> { |
| <span class="ident">pos</span>: <span class="ident">i</span>, |
| <span class="ident">c</span>: <span class="ident">c</span>, |
| <span class="ident">byte</span>: <span class="prelude-val">None</span>, |
| <span class="ident">len</span>: <span class="ident">c</span>.<span class="ident">len_utf8</span>(), |
| } |
| } |
| |
| <span class="kw">fn</span> <span class="ident">next_char</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">at</span>: <span class="ident">InputAt</span>) <span class="op">-></span> <span class="ident">Char</span> { |
| <span class="ident">at</span>.<span class="ident">char</span>() |
| } |
| |
| <span class="kw">fn</span> <span class="ident">previous_char</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">at</span>: <span class="ident">InputAt</span>) <span class="op">-></span> <span class="ident">Char</span> { |
| <span class="ident">decode_last_utf8</span>(<span class="kw-2">&</span><span class="self">self</span>[..<span class="ident">at</span>.<span class="ident">pos</span>()]).<span class="ident">map</span>(<span class="op">|</span>(<span class="ident">c</span>, _)<span class="op">|</span> <span class="ident">c</span>).<span class="ident">into</span>() |
| } |
| |
| <span class="kw">fn</span> <span class="ident">is_empty_match</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">at</span>: <span class="ident">InputAt</span>, <span class="ident">empty</span>: <span class="kw-2">&</span><span class="ident">InstEmptyLook</span>) <span class="op">-></span> <span class="ident">bool</span> { |
| <span class="kw">use</span> <span class="ident">prog</span>::<span class="ident">EmptyLook</span>::<span class="kw-2">*</span>; |
| <span class="kw">match</span> <span class="ident">empty</span>.<span class="ident">look</span> { |
| <span class="ident">StartLine</span> <span class="op">=></span> { |
| <span class="kw">let</span> <span class="ident">c</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">previous_char</span>(<span class="ident">at</span>); |
| <span class="ident">at</span>.<span class="ident">pos</span>() <span class="op">==</span> <span class="number">0</span> <span class="op">||</span> <span class="ident">c</span> <span class="op">==</span> <span class="string">'\n'</span> |
| } |
| <span class="ident">EndLine</span> <span class="op">=></span> { |
| <span class="kw">let</span> <span class="ident">c</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">next_char</span>(<span class="ident">at</span>); |
| <span class="ident">at</span>.<span class="ident">pos</span>() <span class="op">==</span> <span class="self">self</span>.<span class="ident">len</span>() <span class="op">||</span> <span class="ident">c</span> <span class="op">==</span> <span class="string">'\n'</span> |
| } |
| <span class="ident">StartText</span> <span class="op">=></span> <span class="ident">at</span>.<span class="ident">pos</span>() <span class="op">==</span> <span class="number">0</span>, |
| <span class="ident">EndText</span> <span class="op">=></span> <span class="ident">at</span>.<span class="ident">pos</span>() <span class="op">==</span> <span class="self">self</span>.<span class="ident">len</span>(), |
| <span class="ident">WordBoundary</span> <span class="op">=></span> { |
| <span class="kw">let</span> (<span class="ident">c1</span>, <span class="ident">c2</span>) <span class="op">=</span> (<span class="self">self</span>.<span class="ident">previous_char</span>(<span class="ident">at</span>), <span class="self">self</span>.<span class="ident">next_char</span>(<span class="ident">at</span>)); |
| <span class="ident">c1</span>.<span class="ident">is_word_char</span>() <span class="op">!=</span> <span class="ident">c2</span>.<span class="ident">is_word_char</span>() |
| } |
| <span class="ident">NotWordBoundary</span> <span class="op">=></span> { |
| <span class="kw">let</span> (<span class="ident">c1</span>, <span class="ident">c2</span>) <span class="op">=</span> (<span class="self">self</span>.<span class="ident">previous_char</span>(<span class="ident">at</span>), <span class="self">self</span>.<span class="ident">next_char</span>(<span class="ident">at</span>)); |
| <span class="ident">c1</span>.<span class="ident">is_word_char</span>() <span class="op">==</span> <span class="ident">c2</span>.<span class="ident">is_word_char</span>() |
| } |
| <span class="ident">WordBoundaryAscii</span> <span class="op">=></span> { |
| <span class="kw">let</span> (<span class="ident">c1</span>, <span class="ident">c2</span>) <span class="op">=</span> (<span class="self">self</span>.<span class="ident">previous_char</span>(<span class="ident">at</span>), <span class="self">self</span>.<span class="ident">next_char</span>(<span class="ident">at</span>)); |
| <span class="ident">c1</span>.<span class="ident">is_word_byte</span>() <span class="op">!=</span> <span class="ident">c2</span>.<span class="ident">is_word_byte</span>() |
| } |
| <span class="ident">NotWordBoundaryAscii</span> <span class="op">=></span> { |
| <span class="kw">let</span> (<span class="ident">c1</span>, <span class="ident">c2</span>) <span class="op">=</span> (<span class="self">self</span>.<span class="ident">previous_char</span>(<span class="ident">at</span>), <span class="self">self</span>.<span class="ident">next_char</span>(<span class="ident">at</span>)); |
| <span class="ident">c1</span>.<span class="ident">is_word_byte</span>() <span class="op">==</span> <span class="ident">c2</span>.<span class="ident">is_word_byte</span>() |
| } |
| } |
| } |
| |
| <span class="kw">fn</span> <span class="ident">prefix_at</span>( |
| <span class="kw-2">&</span><span class="self">self</span>, |
| <span class="ident">prefixes</span>: <span class="kw-2">&</span><span class="ident">LiteralSearcher</span>, |
| <span class="ident">at</span>: <span class="ident">InputAt</span>, |
| ) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">InputAt</span><span class="op">></span> { |
| <span class="ident">prefixes</span>.<span class="ident">find</span>(<span class="kw-2">&</span><span class="self">self</span>[<span class="ident">at</span>.<span class="ident">pos</span>()..]).<span class="ident">map</span>(<span class="op">|</span>(<span class="ident">s</span>, _)<span class="op">|</span> <span class="self">self</span>.<span class="ident">at</span>(<span class="ident">at</span>.<span class="ident">pos</span>() <span class="op">+</span> <span class="ident">s</span>)) |
| } |
| |
| <span class="kw">fn</span> <span class="ident">len</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">usize</span> { |
| <span class="self">self</span>.<span class="number">0</span>.<span class="ident">len</span>() |
| } |
| |
| <span class="kw">fn</span> <span class="ident">as_bytes</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="kw-2">&</span>[<span class="ident">u8</span>] { |
| <span class="self">self</span>.<span class="number">0</span> |
| } |
| } |
| |
| <span class="doccomment">/// An input reader over bytes.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// N.B. We represent the reader with a string for now, since that gives us</span> |
| <span class="doccomment">/// easy access to necessary Unicode decoding (used for word boundary look</span> |
| <span class="doccomment">/// ahead/look behind).</span> |
| <span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Clone</span>, <span class="ident">Copy</span>, <span class="ident">Debug</span>)]</span> |
| <span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">ByteInput</span><span class="op"><</span><span class="lifetime">'t</span><span class="op">></span> { |
| <span class="ident">text</span>: <span class="kw-2">&</span><span class="lifetime">'t</span> [<span class="ident">u8</span>], |
| <span class="ident">only_utf8</span>: <span class="ident">bool</span>, |
| } |
| |
| <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'t</span><span class="op">></span> <span class="ident">ByteInput</span><span class="op"><</span><span class="lifetime">'t</span><span class="op">></span> { |
| <span class="doccomment">/// Return a new byte-based input reader for the given string.</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new</span>(<span class="ident">text</span>: <span class="kw-2">&</span><span class="lifetime">'t</span> [<span class="ident">u8</span>], <span class="ident">only_utf8</span>: <span class="ident">bool</span>) <span class="op">-></span> <span class="ident">ByteInput</span><span class="op"><</span><span class="lifetime">'t</span><span class="op">></span> { |
| <span class="ident">ByteInput</span> { |
| <span class="ident">text</span>: <span class="ident">text</span>, |
| <span class="ident">only_utf8</span>: <span class="ident">only_utf8</span>, |
| } |
| } |
| } |
| |
| <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'t</span><span class="op">></span> <span class="ident">ops</span>::<span class="ident">Deref</span> <span class="kw">for</span> <span class="ident">ByteInput</span><span class="op"><</span><span class="lifetime">'t</span><span class="op">></span> { |
| <span class="kw">type</span> <span class="ident">Target</span> <span class="op">=</span> [<span class="ident">u8</span>]; |
| |
| <span class="kw">fn</span> <span class="ident">deref</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="kw-2">&</span>[<span class="ident">u8</span>] { |
| <span class="self">self</span>.<span class="ident">text</span> |
| } |
| } |
| |
| <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'t</span><span class="op">></span> <span class="ident">Input</span> <span class="kw">for</span> <span class="ident">ByteInput</span><span class="op"><</span><span class="lifetime">'t</span><span class="op">></span> { |
| <span class="kw">fn</span> <span class="ident">at</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">i</span>: <span class="ident">usize</span>) <span class="op">-></span> <span class="ident">InputAt</span> { |
| <span class="ident">InputAt</span> { |
| <span class="ident">pos</span>: <span class="ident">i</span>, |
| <span class="ident">c</span>: <span class="prelude-val">None</span>.<span class="ident">into</span>(), |
| <span class="ident">byte</span>: <span class="self">self</span>.<span class="ident">get</span>(<span class="ident">i</span>).<span class="ident">map</span>(<span class="op">|</span><span class="kw-2">&</span><span class="ident">b</span><span class="op">|</span> <span class="ident">b</span>), |
| <span class="ident">len</span>: <span class="number">1</span>, |
| } |
| } |
| |
| <span class="kw">fn</span> <span class="ident">next_char</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">at</span>: <span class="ident">InputAt</span>) <span class="op">-></span> <span class="ident">Char</span> { |
| <span class="ident">decode_utf8</span>(<span class="kw-2">&</span><span class="self">self</span>[<span class="ident">at</span>.<span class="ident">pos</span>()..]).<span class="ident">map</span>(<span class="op">|</span>(<span class="ident">c</span>, _)<span class="op">|</span> <span class="ident">c</span>).<span class="ident">into</span>() |
| } |
| |
| <span class="kw">fn</span> <span class="ident">previous_char</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">at</span>: <span class="ident">InputAt</span>) <span class="op">-></span> <span class="ident">Char</span> { |
| <span class="ident">decode_last_utf8</span>(<span class="kw-2">&</span><span class="self">self</span>[..<span class="ident">at</span>.<span class="ident">pos</span>()]).<span class="ident">map</span>(<span class="op">|</span>(<span class="ident">c</span>, _)<span class="op">|</span> <span class="ident">c</span>).<span class="ident">into</span>() |
| } |
| |
| <span class="kw">fn</span> <span class="ident">is_empty_match</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">at</span>: <span class="ident">InputAt</span>, <span class="ident">empty</span>: <span class="kw-2">&</span><span class="ident">InstEmptyLook</span>) <span class="op">-></span> <span class="ident">bool</span> { |
| <span class="kw">use</span> <span class="ident">prog</span>::<span class="ident">EmptyLook</span>::<span class="kw-2">*</span>; |
| <span class="kw">match</span> <span class="ident">empty</span>.<span class="ident">look</span> { |
| <span class="ident">StartLine</span> <span class="op">=></span> { |
| <span class="kw">let</span> <span class="ident">c</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">previous_char</span>(<span class="ident">at</span>); |
| <span class="ident">at</span>.<span class="ident">pos</span>() <span class="op">==</span> <span class="number">0</span> <span class="op">||</span> <span class="ident">c</span> <span class="op">==</span> <span class="string">'\n'</span> |
| } |
| <span class="ident">EndLine</span> <span class="op">=></span> { |
| <span class="kw">let</span> <span class="ident">c</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">next_char</span>(<span class="ident">at</span>); |
| <span class="ident">at</span>.<span class="ident">pos</span>() <span class="op">==</span> <span class="self">self</span>.<span class="ident">len</span>() <span class="op">||</span> <span class="ident">c</span> <span class="op">==</span> <span class="string">'\n'</span> |
| } |
| <span class="ident">StartText</span> <span class="op">=></span> <span class="ident">at</span>.<span class="ident">pos</span>() <span class="op">==</span> <span class="number">0</span>, |
| <span class="ident">EndText</span> <span class="op">=></span> <span class="ident">at</span>.<span class="ident">pos</span>() <span class="op">==</span> <span class="self">self</span>.<span class="ident">len</span>(), |
| <span class="ident">WordBoundary</span> <span class="op">=></span> { |
| <span class="kw">let</span> (<span class="ident">c1</span>, <span class="ident">c2</span>) <span class="op">=</span> (<span class="self">self</span>.<span class="ident">previous_char</span>(<span class="ident">at</span>), <span class="self">self</span>.<span class="ident">next_char</span>(<span class="ident">at</span>)); |
| <span class="ident">c1</span>.<span class="ident">is_word_char</span>() <span class="op">!=</span> <span class="ident">c2</span>.<span class="ident">is_word_char</span>() |
| } |
| <span class="ident">NotWordBoundary</span> <span class="op">=></span> { |
| <span class="kw">let</span> (<span class="ident">c1</span>, <span class="ident">c2</span>) <span class="op">=</span> (<span class="self">self</span>.<span class="ident">previous_char</span>(<span class="ident">at</span>), <span class="self">self</span>.<span class="ident">next_char</span>(<span class="ident">at</span>)); |
| <span class="ident">c1</span>.<span class="ident">is_word_char</span>() <span class="op">==</span> <span class="ident">c2</span>.<span class="ident">is_word_char</span>() |
| } |
| <span class="ident">WordBoundaryAscii</span> <span class="op">=></span> { |
| <span class="kw">let</span> (<span class="ident">c1</span>, <span class="ident">c2</span>) <span class="op">=</span> (<span class="self">self</span>.<span class="ident">previous_char</span>(<span class="ident">at</span>), <span class="self">self</span>.<span class="ident">next_char</span>(<span class="ident">at</span>)); |
| <span class="kw">if</span> <span class="self">self</span>.<span class="ident">only_utf8</span> { |
| <span class="comment">// If we must match UTF-8, then we can't match word</span> |
| <span class="comment">// boundaries at invalid UTF-8.</span> |
| <span class="kw">if</span> <span class="ident">c1</span>.<span class="ident">is_none</span>() <span class="op">&&</span> <span class="op">!</span><span class="ident">at</span>.<span class="ident">is_start</span>() { |
| <span class="kw">return</span> <span class="bool-val">false</span>; |
| } |
| <span class="kw">if</span> <span class="ident">c2</span>.<span class="ident">is_none</span>() <span class="op">&&</span> <span class="op">!</span><span class="ident">at</span>.<span class="ident">is_end</span>() { |
| <span class="kw">return</span> <span class="bool-val">false</span>; |
| } |
| } |
| <span class="ident">c1</span>.<span class="ident">is_word_byte</span>() <span class="op">!=</span> <span class="ident">c2</span>.<span class="ident">is_word_byte</span>() |
| } |
| <span class="ident">NotWordBoundaryAscii</span> <span class="op">=></span> { |
| <span class="kw">let</span> (<span class="ident">c1</span>, <span class="ident">c2</span>) <span class="op">=</span> (<span class="self">self</span>.<span class="ident">previous_char</span>(<span class="ident">at</span>), <span class="self">self</span>.<span class="ident">next_char</span>(<span class="ident">at</span>)); |
| <span class="kw">if</span> <span class="self">self</span>.<span class="ident">only_utf8</span> { |
| <span class="comment">// If we must match UTF-8, then we can't match word</span> |
| <span class="comment">// boundaries at invalid UTF-8.</span> |
| <span class="kw">if</span> <span class="ident">c1</span>.<span class="ident">is_none</span>() <span class="op">&&</span> <span class="op">!</span><span class="ident">at</span>.<span class="ident">is_start</span>() { |
| <span class="kw">return</span> <span class="bool-val">false</span>; |
| } |
| <span class="kw">if</span> <span class="ident">c2</span>.<span class="ident">is_none</span>() <span class="op">&&</span> <span class="op">!</span><span class="ident">at</span>.<span class="ident">is_end</span>() { |
| <span class="kw">return</span> <span class="bool-val">false</span>; |
| } |
| } |
| <span class="ident">c1</span>.<span class="ident">is_word_byte</span>() <span class="op">==</span> <span class="ident">c2</span>.<span class="ident">is_word_byte</span>() |
| } |
| } |
| } |
| |
| <span class="kw">fn</span> <span class="ident">prefix_at</span>( |
| <span class="kw-2">&</span><span class="self">self</span>, |
| <span class="ident">prefixes</span>: <span class="kw-2">&</span><span class="ident">LiteralSearcher</span>, |
| <span class="ident">at</span>: <span class="ident">InputAt</span>, |
| ) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">InputAt</span><span class="op">></span> { |
| <span class="ident">prefixes</span>.<span class="ident">find</span>(<span class="kw-2">&</span><span class="self">self</span>[<span class="ident">at</span>.<span class="ident">pos</span>()..]).<span class="ident">map</span>(<span class="op">|</span>(<span class="ident">s</span>, _)<span class="op">|</span> <span class="self">self</span>.<span class="ident">at</span>(<span class="ident">at</span>.<span class="ident">pos</span>() <span class="op">+</span> <span class="ident">s</span>)) |
| } |
| |
| <span class="kw">fn</span> <span class="ident">len</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">usize</span> { |
| <span class="self">self</span>.<span class="ident">text</span>.<span class="ident">len</span>() |
| } |
| |
| <span class="kw">fn</span> <span class="ident">as_bytes</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="kw-2">&</span>[<span class="ident">u8</span>] { |
| <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">text</span> |
| } |
| } |
| |
| <span class="doccomment">/// An inline representation of `Option<char>`.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// This eliminates the need to do case analysis on `Option<char>` to determine</span> |
| <span class="doccomment">/// ordinality with other characters.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// (The `Option<char>` is not related to encoding. Instead, it is used in the</span> |
| <span class="doccomment">/// matching engines to represent the beginning and ending boundaries of the</span> |
| <span class="doccomment">/// search text.)</span> |
| <span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Clone</span>, <span class="ident">Copy</span>, <span class="ident">Hash</span>, <span class="ident">PartialEq</span>, <span class="ident">Eq</span>, <span class="ident">PartialOrd</span>, <span class="ident">Ord</span>)]</span> |
| <span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Char</span>(<span class="ident">u32</span>); |
| |
| <span class="kw">impl</span> <span class="ident">fmt</span>::<span class="ident">Debug</span> <span class="kw">for</span> <span class="ident">Char</span> { |
| <span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span>) <span class="op">-></span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> { |
| <span class="kw">match</span> <span class="ident">char</span>::<span class="ident">from_u32</span>(<span class="self">self</span>.<span class="number">0</span>) { |
| <span class="prelude-val">None</span> <span class="op">=></span> <span class="macro">write</span><span class="macro">!</span>(<span class="ident">f</span>, <span class="string">"Empty"</span>), |
| <span class="prelude-val">Some</span>(<span class="ident">c</span>) <span class="op">=></span> <span class="macro">write</span><span class="macro">!</span>(<span class="ident">f</span>, <span class="string">"{:?}"</span>, <span class="ident">c</span>), |
| } |
| } |
| } |
| |
| <span class="kw">impl</span> <span class="ident">Char</span> { |
| <span class="doccomment">/// Returns true iff the character is absent.</span> |
| <span class="attribute">#[<span class="ident">inline</span>]</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">is_none</span>(<span class="self">self</span>) <span class="op">-></span> <span class="ident">bool</span> { <span class="self">self</span>.<span class="number">0</span> <span class="op">==</span> <span class="ident">u32</span>::<span class="ident">MAX</span> } |
| |
| <span class="doccomment">/// Returns the length of the character's UTF-8 encoding.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// If the character is absent, then `0` is returned.</span> |
| <span class="attribute">#[<span class="ident">inline</span>]</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">len_utf8</span>(<span class="self">self</span>) <span class="op">-></span> <span class="ident">usize</span> { |
| <span class="ident">char</span>::<span class="ident">from_u32</span>(<span class="self">self</span>.<span class="number">0</span>).<span class="ident">map_or</span>(<span class="number">0</span>, <span class="op">|</span><span class="ident">c</span><span class="op">|</span> <span class="ident">c</span>.<span class="ident">len_utf8</span>()) |
| } |
| |
| <span class="doccomment">/// Returns true iff the character is a word character.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// If the character is absent, then false is returned.</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">is_word_char</span>(<span class="self">self</span>) <span class="op">-></span> <span class="ident">bool</span> { |
| <span class="ident">char</span>::<span class="ident">from_u32</span>(<span class="self">self</span>.<span class="number">0</span>).<span class="ident">map_or</span>(<span class="bool-val">false</span>, <span class="ident">syntax</span>::<span class="ident">is_word_char</span>) |
| } |
| |
| <span class="doccomment">/// Returns true iff the byte is a word byte.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// If the byte is absent, then false is returned.</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">is_word_byte</span>(<span class="self">self</span>) <span class="op">-></span> <span class="ident">bool</span> { |
| <span class="kw">match</span> <span class="ident">char</span>::<span class="ident">from_u32</span>(<span class="self">self</span>.<span class="number">0</span>) { |
| <span class="prelude-val">None</span> <span class="op">=></span> <span class="bool-val">false</span>, |
| <span class="prelude-val">Some</span>(<span class="ident">c</span>) <span class="kw">if</span> <span class="ident">c</span> <span class="op"><=</span> <span class="string">'\u{7F}'</span> <span class="op">=></span> <span class="ident">syntax</span>::<span class="ident">is_word_byte</span>(<span class="ident">c</span> <span class="kw">as</span> <span class="ident">u8</span>), |
| <span class="prelude-val">Some</span>(_) <span class="op">=></span> <span class="bool-val">false</span>, |
| } |
| } |
| |
| <span class="doccomment">/// Converts the character to a real primitive `char`.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// If the character is absent, then `None` is returned.</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">as_char</span>(<span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">char</span><span class="op">></span> { |
| <span class="comment">// This is only used in the `regex!` macro because it expands char</span> |
| <span class="comment">// classes into `match` expressions (instead of binary search).</span> |
| <span class="ident">char</span>::<span class="ident">from_u32</span>(<span class="self">self</span>.<span class="number">0</span>) |
| } |
| } |
| |
| <span class="kw">impl</span> <span class="ident">From</span><span class="op"><</span><span class="ident">char</span><span class="op">></span> <span class="kw">for</span> <span class="ident">Char</span> { |
| <span class="kw">fn</span> <span class="ident">from</span>(<span class="ident">c</span>: <span class="ident">char</span>) <span class="op">-></span> <span class="ident">Char</span> { <span class="ident">Char</span>(<span class="ident">c</span> <span class="kw">as</span> <span class="ident">u32</span>) } |
| } |
| |
| <span class="kw">impl</span> <span class="ident">From</span><span class="op"><</span><span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">char</span><span class="op">>></span> <span class="kw">for</span> <span class="ident">Char</span> { |
| <span class="kw">fn</span> <span class="ident">from</span>(<span class="ident">c</span>: <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">char</span><span class="op">></span>) <span class="op">-></span> <span class="ident">Char</span> { |
| <span class="ident">c</span>.<span class="ident">map_or</span>(<span class="ident">Char</span>(<span class="ident">u32</span>::<span class="ident">MAX</span>), <span class="op">|</span><span class="ident">c</span><span class="op">|</span> <span class="ident">c</span>.<span class="ident">into</span>()) |
| } |
| } |
| |
| <span class="kw">impl</span> <span class="ident">PartialEq</span><span class="op"><</span><span class="ident">char</span><span class="op">></span> <span class="kw">for</span> <span class="ident">Char</span> { |
| <span class="attribute">#[<span class="ident">inline</span>]</span> |
| <span class="kw">fn</span> <span class="ident">eq</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&</span><span class="ident">char</span>) <span class="op">-></span> <span class="ident">bool</span> { <span class="self">self</span>.<span class="number">0</span> <span class="op">==</span> <span class="kw-2">*</span><span class="ident">other</span> <span class="kw">as</span> <span class="ident">u32</span> } |
| } |
| |
| <span class="kw">impl</span> <span class="ident">PartialEq</span><span class="op"><</span><span class="ident">Char</span><span class="op">></span> <span class="kw">for</span> <span class="ident">char</span> { |
| <span class="attribute">#[<span class="ident">inline</span>]</span> |
| <span class="kw">fn</span> <span class="ident">eq</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&</span><span class="ident">Char</span>) <span class="op">-></span> <span class="ident">bool</span> { <span class="kw-2">*</span><span class="self">self</span> <span class="kw">as</span> <span class="ident">u32</span> <span class="op">==</span> <span class="ident">other</span>.<span class="number">0</span> } |
| } |
| |
| <span class="kw">impl</span> <span class="ident">PartialOrd</span><span class="op"><</span><span class="ident">char</span><span class="op">></span> <span class="kw">for</span> <span class="ident">Char</span> { |
| <span class="attribute">#[<span class="ident">inline</span>]</span> |
| <span class="kw">fn</span> <span class="ident">partial_cmp</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&</span><span class="ident">char</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">Ordering</span><span class="op">></span> { |
| <span class="self">self</span>.<span class="number">0</span>.<span class="ident">partial_cmp</span>(<span class="kw-2">&</span>(<span class="kw-2">*</span><span class="ident">other</span> <span class="kw">as</span> <span class="ident">u32</span>)) |
| } |
| } |
| |
| <span class="kw">impl</span> <span class="ident">PartialOrd</span><span class="op"><</span><span class="ident">Char</span><span class="op">></span> <span class="kw">for</span> <span class="ident">char</span> { |
| <span class="attribute">#[<span class="ident">inline</span>]</span> |
| <span class="kw">fn</span> <span class="ident">partial_cmp</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&</span><span class="ident">Char</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">Ordering</span><span class="op">></span> { |
| (<span class="kw-2">*</span><span class="self">self</span> <span class="kw">as</span> <span class="ident">u32</span>).<span class="ident">partial_cmp</span>(<span class="kw-2">&</span><span class="ident">other</span>.<span class="number">0</span>) |
| } |
| } |
| </pre> |
| </section> |
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