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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='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>ops</span>;
<span class='kw'>use</span> <span class='ident'>char</span>::<span class='ident'>Char</span>;
<span class='kw'>use</span> <span class='ident'>prefix</span>::<span class='ident'>Prefix</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'>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_beginning</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 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 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 an encoding of the char position just prior to byte offset `i`.</span>
<span class='kw'>fn</span> <span class='ident'>previous_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'>/// 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'>Prefix</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'>/// An input reader over characters.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// (This is the only implementation of `Input` at the moment.)</span>
<span class='attribute'>#[<span class='ident'>derive</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'>str</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'>str</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'>str</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'>str</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='comment'>// This `inline(always)` increases throughput by almost 25% on the `hard`</span>
<span class='comment'>// benchmarks over a normal `inline` annotation.</span>
<span class='comment'>//</span>
<span class='comment'>// I'm not sure why `#[inline]` isn't enough to convince LLVM, but it is</span>
<span class='comment'>// used *a lot* in the guts of the matching engines.</span>
<span class='attribute'>#[<span class='ident'>inline</span>(<span class='ident'>always</span>)]</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='self'>self</span>[<span class='ident'>i</span>..].<span class='ident'>chars</span>().<span class='ident'>next</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'>len</span>: <span class='ident'>c</span>.<span class='ident'>len_utf8</span>(),
}
}
<span class='kw'>fn</span> <span class='ident'>previous_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='ident'>Char</span> <span class='op'>=</span> <span class='self'>self</span>[..<span class='ident'>i</span>].<span class='ident'>chars</span>().<span class='ident'>rev</span>().<span class='ident'>next</span>().<span class='ident'>into</span>();
<span class='kw'>let</span> <span class='ident'>len</span> <span class='op'>=</span> <span class='ident'>c</span>.<span class='ident'>len_utf8</span>();
<span class='ident'>InputAt</span> {
<span class='ident'>pos</span>: <span class='ident'>i</span> <span class='op'>-</span> <span class='ident'>len</span>,
<span class='ident'>c</span>: <span class='ident'>c</span>,
<span class='ident'>len</span>: <span class='ident'>len</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'>Prefix</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>))
}
}
</pre>
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