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author2015-06-29 20:16:15 +0000
committer2015-06-29 20:16:15 +0000
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+ <section id='main' class="content source"><pre class="line-numbers"><span id="1"> 1</span>
+<span id="2"> 2</span>
+<span id="3"> 3</span>
+<span id="4"> 4</span>
+<span id="5"> 5</span>
+<span id="6"> 6</span>
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+<span id="55"> 55</span>
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+<span id="65"> 65</span>
+<span id="66"> 66</span>
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+<span id="93"> 93</span>
+<span id="94"> 94</span>
+<span id="95"> 95</span>
+<span id="96"> 96</span>
+<span id="97"> 97</span>
+<span id="98"> 98</span>
+<span id="99"> 99</span>
+<span id="100">100</span>
+<span id="101">101</span>
+<span id="102">102</span>
+<span id="103">103</span>
+<span id="104">104</span>
+<span id="105">105</span>
+<span id="106">106</span>
+<span id="107">107</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 &lt;LICENSE-APACHE or</span>
+<span class='comment'>// http://www.apache.org/licenses/LICENSE-2.0&gt; or the MIT license</span>
+<span class='comment'>// &lt;LICENSE-MIT or http://opensource.org/licenses/MIT&gt;, 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'>u32</span>;
+
+<span class='kw'>use</span> <span class='ident'>syntax</span>;
+
+<span class='doccomment'>/// An inline representation of `Option&lt;char&gt;`.</span>
+<span class='doccomment'>///</span>
+<span class='doccomment'>/// This eliminates the need to do case analysis on `Option&lt;char&gt;` to determine</span>
+<span class='doccomment'>/// ordinality with other characters.</span>
+<span class='doccomment'>///</span>
+<span class='doccomment'>/// (The `Option&lt;char&gt;` 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'>&amp;</span><span class='self'>self</span>, <span class='ident'>f</span>: <span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='ident'>fmt</span>::<span class='ident'>Formatter</span>) <span class='op'>-&gt;</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'>=&gt;</span> <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;Empty&quot;</span>),
+ <span class='prelude-val'>Some</span>(<span class='ident'>c</span>) <span class='op'>=&gt;</span> <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;{:?}&quot;</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'>-&gt;</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&#39;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'>-&gt;</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</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='ident'>unwrap_or</span>(<span class='number'>0</span>)
+ }
+
+ <span class='doccomment'>/// Returns the simple case folding of this character.</span>
+ <span class='doccomment'>///</span>
+ <span class='doccomment'>/// If the character is absent, then absence is returned.</span>
+ <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>case_fold</span>(<span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='ident'>Char</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</span>(<span class='ident'>syntax</span>::<span class='ident'>simple_case_fold</span>).<span class='ident'>into</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'>-&gt;</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</span>(<span class='ident'>syntax</span>::<span class='ident'>is_word_char</span>).<span class='ident'>unwrap_or</span>(<span class='boolval'>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'>-&gt;</span> <span class='prelude-ty'>Option</span><span class='op'>&lt;</span><span class='ident'>char</span><span class='op'>&gt;</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'>&lt;</span><span class='ident'>char</span><span class='op'>&gt;</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'>-&gt;</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'>&lt;</span><span class='prelude-ty'>Option</span><span class='op'>&lt;</span><span class='ident'>char</span><span class='op'>&gt;&gt;</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'>&lt;</span><span class='ident'>char</span><span class='op'>&gt;</span>) <span class='op'>-&gt;</span> <span class='ident'>Char</span> {
+ <span class='ident'>c</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'>unwrap_or</span>(<span class='ident'>Char</span>(<span class='ident'>u32</span>::<span class='ident'>MAX</span>))
+ }
+}
+
+<span class='kw'>impl</span> <span class='ident'>PartialEq</span><span class='op'>&lt;</span><span class='ident'>char</span><span class='op'>&gt;</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'>&amp;</span><span class='self'>self</span>, <span class='ident'>other</span>: <span class='kw-2'>&amp;</span><span class='ident'>char</span>) <span class='op'>-&gt;</span> <span class='ident'>bool</span> { <span class='self'>self</span>.<span class='number'>0</span> <span class='op'>==</span> <span class='op'>*</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'>&lt;</span><span class='ident'>Char</span><span class='op'>&gt;</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'>&amp;</span><span class='self'>self</span>, <span class='ident'>other</span>: <span class='kw-2'>&amp;</span><span class='ident'>Char</span>) <span class='op'>-&gt;</span> <span class='ident'>bool</span> { <span class='op'>*</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'>&lt;</span><span class='ident'>char</span><span class='op'>&gt;</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'>&amp;</span><span class='self'>self</span>, <span class='ident'>other</span>: <span class='kw-2'>&amp;</span><span class='ident'>char</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Option</span><span class='op'>&lt;</span><span class='ident'>Ordering</span><span class='op'>&gt;</span> {
+ <span class='self'>self</span>.<span class='number'>0</span>.<span class='ident'>partial_cmp</span>(<span class='kw-2'>&amp;</span>(<span class='op'>*</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'>&lt;</span><span class='ident'>Char</span><span class='op'>&gt;</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'>&amp;</span><span class='self'>self</span>, <span class='ident'>other</span>: <span class='kw-2'>&amp;</span><span class='ident'>Char</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Option</span><span class='op'>&lt;</span><span class='ident'>Ordering</span><span class='op'>&gt;</span> {
+ (<span class='op'>*</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'>&amp;</span><span class='ident'>other</span>.<span class='number'>0</span>)
+ }
+}
+</pre>
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