<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Source to the Rust file `/Users/galoz/.cargo/registry/src/github.com-1ecc6299db9ec823/unicode-segmentation-1.3.0/src/word.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>word.rs.html -- source</title><link rel="stylesheet" type="text/css" href="../../normalize.css"><link rel="stylesheet" type="text/css" href="../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../../dark.css"><link rel="stylesheet" type="text/css" href="../../light.css" id="themeStyle"><script src="../../storage.js"></script><noscript><link rel="stylesheet" href="../../noscript.css"></noscript><link rel="shortcut icon" href="https://unicode-rs.github.io/unicode-rs_sm.png"><style type="text/css">#crate-search{background-image:url("../../down-arrow.svg");}</style></head><body class="rustdoc source"><!--[if lte IE 8]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><div class="sidebar-menu">☰</div><a href='../../unicode_segmentation/index.html'><div class='logo-container'><img src='https://unicode-rs.github.io/unicode-rs_sm.png' alt='logo'></div></a></nav><div class="theme-picker"><button id="theme-picker" aria-label="Pick another theme!"><img src="../../brush.svg" width="18" alt="Pick another theme!"></button><div id="theme-choices"></div></div><script src="../../theme.js"></script><nav class="sub"><form class="search-form js-only"><div class="search-container"><div><select id="crate-search"><option value="All crates">All crates</option></select><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"></div><a id="settings-menu" href="../../settings.html"><img src="../../wheel.svg" width="18" alt="Change settings"></a></div></form></nav><section id="main" class="content"><pre class="line-numbers"><span id="1"> 1</span>
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<span id="629">629</span>
<span id="630">630</span>
<span id="631">631</span>
<span id="632">632</span>
<span id="633">633</span>
<span id="634">634</span>
<span id="635">635</span>
<span id="636">636</span>
<span id="637">637</span>
<span id="638">638</span>
<span id="639">639</span>
<span id="640">640</span>
<span id="641">641</span>
<span id="642">642</span>
<span id="643">643</span>
<span id="644">644</span>
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<span id="646">646</span>
<span id="647">647</span>
<span id="648">648</span>
<span id="649">649</span>
</pre><div class="example-wrap"><pre class="rust ">
<span class="comment">// Copyright 2012-2014 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">core</span>::<span class="ident">cmp</span>;
<span class="kw">use</span> <span class="ident">core</span>::<span class="ident">iter</span>::<span class="ident">Filter</span>;
<span class="kw">use</span> <span class="ident">tables</span>::<span class="ident">word</span>::<span class="ident">WordCat</span>;
<span class="doccomment">/// An iterator over the substrings of a string which, after splitting the string on</span>
<span class="doccomment">/// [word boundaries](http://www.unicode.org/reports/tr29/#Word_Boundaries),</span>
<span class="doccomment">/// contain any characters with the</span>
<span class="doccomment">/// [Alphabetic](http://unicode.org/reports/tr44/#Alphabetic)</span>
<span class="doccomment">/// property, or with</span>
<span class="doccomment">/// [General_Category=Number](http://unicode.org/reports/tr44/#General_Category_Values).</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">UnicodeWords</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> {
<span class="ident">inner</span>: <span class="ident">Filter</span><span class="op"><</span><span class="ident">UWordBounds</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span>, <span class="kw">fn</span>(<span class="op">&&</span><span class="ident">str</span>) <span class="op">-></span> <span class="ident">bool</span><span class="op">></span>,
}
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> <span class="ident">Iterator</span> <span class="kw">for</span> <span class="ident">UnicodeWords</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> {
<span class="kw">type</span> <span class="ident">Item</span> <span class="op">=</span> <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">str</span>;
<span class="attribute">#[<span class="ident">inline</span>]</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="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">str</span><span class="op">></span> { <span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">next</span>() }
}
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> <span class="ident">DoubleEndedIterator</span> <span class="kw">for</span> <span class="ident">UnicodeWords</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> {
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">next_back</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="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">str</span><span class="op">></span> { <span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">next_back</span>() }
}
<span class="doccomment">/// External iterator for a string's</span>
<span class="doccomment">/// [word boundaries](http://www.unicode.org/reports/tr29/#Word_Boundaries).</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Clone</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">UWordBounds</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> {
<span class="ident">string</span>: <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">str</span>,
<span class="ident">cat</span>: <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">WordCat</span><span class="op">></span>,
<span class="ident">catb</span>: <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">WordCat</span><span class="op">></span>,
}
<span class="doccomment">/// External iterator for word boundaries and byte offsets.</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Clone</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">UWordBoundIndices</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> {
<span class="ident">start_offset</span>: <span class="ident">usize</span>,
<span class="ident">iter</span>: <span class="ident">UWordBounds</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span>,
}
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> <span class="ident">UWordBoundIndices</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> {
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="doccomment">/// View the underlying data (the part yet to be iterated) as a slice of the original string.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```rust</span>
<span class="doccomment">/// # use unicode_segmentation::UnicodeSegmentation;</span>
<span class="doccomment">/// let mut iter = "Hello world".split_word_bound_indices();</span>
<span class="doccomment">/// assert_eq!(iter.as_str(), "Hello world");</span>
<span class="doccomment">/// iter.next();</span>
<span class="doccomment">/// assert_eq!(iter.as_str(), " world");</span>
<span class="doccomment">/// iter.next();</span>
<span class="doccomment">/// assert_eq!(iter.as_str(), "world");</span>
<span class="doccomment">/// ```</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">as_str</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">str</span> {
<span class="self">self</span>.<span class="ident">iter</span>.<span class="ident">as_str</span>()
}
}
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> <span class="ident">Iterator</span> <span class="kw">for</span> <span class="ident">UWordBoundIndices</span><span class="op"><</span><span class="lifetime">'a</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="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">str</span>);
<span class="attribute">#[<span class="ident">inline</span>]</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="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">str</span>)<span class="op">></span> {
<span class="self">self</span>.<span class="ident">iter</span>.<span class="ident">next</span>().<span class="ident">map</span>(<span class="op">|</span><span class="ident">s</span><span class="op">|</span> (<span class="ident">s</span>.<span class="ident">as_ptr</span>() <span class="kw">as</span> <span class="ident">usize</span> <span class="op">-</span> <span class="self">self</span>.<span class="ident">start_offset</span>, <span class="ident">s</span>))
}
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">size_hint</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> (<span class="ident">usize</span>, <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span>) {
<span class="self">self</span>.<span class="ident">iter</span>.<span class="ident">size_hint</span>()
}
}
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> <span class="ident">DoubleEndedIterator</span> <span class="kw">for</span> <span class="ident">UWordBoundIndices</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> {
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">next_back</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="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">str</span>)<span class="op">></span> {
<span class="self">self</span>.<span class="ident">iter</span>.<span class="ident">next_back</span>().<span class="ident">map</span>(<span class="op">|</span><span class="ident">s</span><span class="op">|</span> (<span class="ident">s</span>.<span class="ident">as_ptr</span>() <span class="kw">as</span> <span class="ident">usize</span> <span class="op">-</span> <span class="self">self</span>.<span class="ident">start_offset</span>, <span class="ident">s</span>))
}
}
<span class="comment">// state machine for word boundary rules</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Clone</span>,<span class="ident">Copy</span>,<span class="ident">PartialEq</span>,<span class="ident">Eq</span>,<span class="ident">Debug</span>)]</span>
<span class="kw">enum</span> <span class="ident">UWordBoundsState</span> {
<span class="ident">Start</span>,
<span class="ident">Letter</span>,
<span class="ident">HLetter</span>,
<span class="ident">Numeric</span>,
<span class="ident">Katakana</span>,
<span class="ident">ExtendNumLet</span>,
<span class="ident">Regional</span>(<span class="ident">RegionalState</span>),
<span class="ident">FormatExtend</span>(<span class="ident">FormatExtendType</span>),
<span class="ident">Zwj</span>,
<span class="ident">Emoji</span>,
}
<span class="comment">// subtypes for FormatExtend state in UWordBoundsState</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Clone</span>,<span class="ident">Copy</span>,<span class="ident">PartialEq</span>,<span class="ident">Eq</span>,<span class="ident">Debug</span>)]</span>
<span class="kw">enum</span> <span class="ident">FormatExtendType</span> {
<span class="ident">AcceptAny</span>,
<span class="ident">AcceptNone</span>,
<span class="ident">RequireLetter</span>,
<span class="ident">RequireHLetter</span>,
<span class="ident">AcceptQLetter</span>,
<span class="ident">RequireNumeric</span>,
}
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Clone</span>,<span class="ident">Copy</span>,<span class="ident">PartialEq</span>,<span class="ident">Eq</span>,<span class="ident">Debug</span>)]</span>
<span class="kw">enum</span> <span class="ident">RegionalState</span> {
<span class="ident">Half</span>,
<span class="ident">Full</span>,
<span class="ident">Unknown</span>,
}
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> <span class="ident">Iterator</span> <span class="kw">for</span> <span class="ident">UWordBounds</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> {
<span class="kw">type</span> <span class="ident">Item</span> <span class="op">=</span> <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">str</span>;
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">size_hint</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> (<span class="ident">usize</span>, <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span>) {
<span class="kw">let</span> <span class="ident">slen</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">string</span>.<span class="ident">len</span>();
(<span class="ident">cmp</span>::<span class="ident">min</span>(<span class="ident">slen</span>, <span class="number">1</span>), <span class="prelude-val">Some</span>(<span class="ident">slen</span>))
}
<span class="attribute">#[<span class="ident">inline</span>]</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="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">str</span><span class="op">></span> {
<span class="kw">use</span> <span class="self">self</span>::<span class="ident">UWordBoundsState</span>::<span class="kw-2">*</span>;
<span class="kw">use</span> <span class="self">self</span>::<span class="ident">FormatExtendType</span>::<span class="kw-2">*</span>;
<span class="kw">use</span> <span class="ident">tables</span>::<span class="ident">word</span> <span class="kw">as</span> <span class="ident">wd</span>;
<span class="kw">if</span> <span class="self">self</span>.<span class="ident">string</span>.<span class="ident">len</span>() <span class="op">==</span> <span class="number">0</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">take_curr</span> <span class="op">=</span> <span class="bool-val">true</span>;
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">take_cat</span> <span class="op">=</span> <span class="bool-val">true</span>;
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">idx</span> <span class="op">=</span> <span class="number">0</span>;
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">saveidx</span> <span class="op">=</span> <span class="number">0</span>;
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">state</span> <span class="op">=</span> <span class="ident">Start</span>;
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">cat</span> <span class="op">=</span> <span class="ident">wd</span>::<span class="ident">WC_Any</span>;
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">savecat</span> <span class="op">=</span> <span class="ident">wd</span>::<span class="ident">WC_Any</span>;
<span class="comment">// Whether or not the previous category was ZWJ</span>
<span class="comment">// ZWJs get collapsed, so this handles precedence of WB3c over WB4</span>
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">prev_zwj</span>;
<span class="kw">for</span> (<span class="ident">curr</span>, <span class="ident">ch</span>) <span class="kw">in</span> <span class="self">self</span>.<span class="ident">string</span>.<span class="ident">char_indices</span>() {
<span class="ident">idx</span> <span class="op">=</span> <span class="ident">curr</span>;
<span class="ident">prev_zwj</span> <span class="op">=</span> <span class="ident">cat</span> <span class="op">==</span> <span class="ident">wd</span>::<span class="ident">WC_ZWJ</span>;
<span class="comment">// if there's a category cached, grab it</span>
<span class="ident">cat</span> <span class="op">=</span> <span class="kw">match</span> <span class="self">self</span>.<span class="ident">cat</span> {
<span class="prelude-val">None</span> <span class="op">=></span> <span class="ident">wd</span>::<span class="ident">word_category</span>(<span class="ident">ch</span>),
<span class="kw">_</span> <span class="op">=></span> <span class="self">self</span>.<span class="ident">cat</span>.<span class="ident">take</span>().<span class="ident">unwrap</span>()
};
<span class="ident">take_cat</span> <span class="op">=</span> <span class="bool-val">true</span>;
<span class="comment">// handle rule WB4</span>
<span class="comment">// just skip all format, extend, and zwj chars</span>
<span class="comment">// note that Start is a special case: if there's a bunch of Format | Extend</span>
<span class="comment">// characters at the beginning of a block of text, dump them out as one unit.</span>
<span class="comment">//</span>
<span class="comment">// (This is not obvious from the wording of UAX#29, but if you look at the</span>
<span class="comment">// test cases http://www.unicode.org/Public/UNIDATA/auxiliary/WordBreakTest.txt</span>
<span class="comment">// then the "correct" interpretation of WB4 becomes apparent.)</span>
<span class="kw">if</span> <span class="ident">state</span> <span class="op">!=</span> <span class="ident">Start</span> {
<span class="kw">match</span> <span class="ident">cat</span> {
<span class="ident">wd</span>::<span class="ident">WC_Extend</span> <span class="op">|</span> <span class="ident">wd</span>::<span class="ident">WC_Format</span> <span class="op">|</span> <span class="ident">wd</span>::<span class="ident">WC_ZWJ</span> <span class="op">=></span> {
<span class="kw">continue</span>
}
<span class="kw">_</span> <span class="op">=></span> {}
}
}
<span class="comment">// rule WB3c</span>
<span class="comment">// WB4 makes all ZWJs collapse into the previous state</span>
<span class="comment">// but you can still be in a Zwj state if you started with Zwj</span>
<span class="comment">//</span>
<span class="comment">// This means that Zwj + Extend will collapse into Zwj, which is wrong,</span>
<span class="comment">// since Extend has a boundary with following EBG/GAZ chars but ZWJ doesn't,</span>
<span class="comment">// and that rule (WB3c) has higher priority</span>
<span class="comment">//</span>
<span class="comment">// Additionally, Emoji_Base+ZWJ+(EBG/GAZ) will collapse into Emoji_Base+EBG/GAZ</span>
<span class="comment">// which won't have a boundary even though EB+ZWJ+GAZ should have a boundary.</span>
<span class="comment">//</span>
<span class="comment">// Thus, we separately keep track of whether or not the last character</span>
<span class="comment">// was a ZWJ. This is an additional bit of state tracked outside of the</span>
<span class="comment">// state enum; the state enum represents the last non-zwj state encountered.</span>
<span class="comment">// When prev_zwj is true, for the purposes of WB3c, we are in the Zwj state,</span>
<span class="comment">// however we are in the previous state for the purposes of all other rules.</span>
<span class="kw">if</span> <span class="ident">prev_zwj</span> {
<span class="kw">match</span> <span class="ident">cat</span> {
<span class="ident">wd</span>::<span class="ident">WC_Glue_After_Zwj</span> <span class="op">=></span> <span class="kw">continue</span>,
<span class="ident">wd</span>::<span class="ident">WC_E_Base_GAZ</span> <span class="op">=></span> {
<span class="ident">state</span> <span class="op">=</span> <span class="ident">Emoji</span>;
<span class="kw">continue</span>;
},
<span class="kw">_</span> <span class="op">=></span> ()
}
}
<span class="comment">// Don't use `continue` in this match without updating `cat`</span>
<span class="ident">state</span> <span class="op">=</span> <span class="kw">match</span> <span class="ident">state</span> {
<span class="ident">Start</span> <span class="kw">if</span> <span class="ident">cat</span> <span class="op">==</span> <span class="ident">wd</span>::<span class="ident">WC_CR</span> <span class="op">=></span> {
<span class="ident">idx</span> <span class="op">+=</span> <span class="kw">match</span> <span class="self">self</span>.<span class="ident">get_next_cat</span>(<span class="ident">idx</span>) {
<span class="prelude-val">Some</span>(<span class="ident">ncat</span>) <span class="kw">if</span> <span class="ident">ncat</span> <span class="op">==</span> <span class="ident">wd</span>::<span class="ident">WC_LF</span> <span class="op">=></span> <span class="number">1</span>, <span class="comment">// rule WB3</span>
<span class="kw">_</span> <span class="op">=></span> <span class="number">0</span>
};
<span class="kw">break</span>; <span class="comment">// rule WB3a</span>
},
<span class="ident">Start</span> <span class="op">=></span> <span class="kw">match</span> <span class="ident">cat</span> {
<span class="ident">wd</span>::<span class="ident">WC_ALetter</span> <span class="op">=></span> <span class="ident">Letter</span>, <span class="comment">// rule WB5, WB6, WB9, WB13a</span>
<span class="ident">wd</span>::<span class="ident">WC_Hebrew_Letter</span> <span class="op">=></span> <span class="ident">HLetter</span>, <span class="comment">// rule WB5, WB6, WB7a, WB7b, WB9, WB13a</span>
<span class="ident">wd</span>::<span class="ident">WC_Numeric</span> <span class="op">=></span> <span class="ident">Numeric</span>, <span class="comment">// rule WB8, WB10, WB12, WB13a</span>
<span class="ident">wd</span>::<span class="ident">WC_Katakana</span> <span class="op">=></span> <span class="ident">Katakana</span>, <span class="comment">// rule WB13, WB13a</span>
<span class="ident">wd</span>::<span class="ident">WC_ExtendNumLet</span> <span class="op">=></span> <span class="ident">ExtendNumLet</span>, <span class="comment">// rule WB13a, WB13b</span>
<span class="ident">wd</span>::<span class="ident">WC_Regional_Indicator</span> <span class="op">=></span> <span class="ident">Regional</span>(<span class="ident">RegionalState</span>::<span class="ident">Half</span>), <span class="comment">// rule WB13c</span>
<span class="ident">wd</span>::<span class="ident">WC_LF</span> <span class="op">|</span> <span class="ident">wd</span>::<span class="ident">WC_Newline</span> <span class="op">=></span> <span class="kw">break</span>, <span class="comment">// rule WB3a</span>
<span class="ident">wd</span>::<span class="ident">WC_ZWJ</span> <span class="op">=></span> <span class="ident">Zwj</span>, <span class="comment">// rule WB3c</span>
<span class="ident">wd</span>::<span class="ident">WC_E_Base</span> <span class="op">|</span> <span class="ident">wd</span>::<span class="ident">WC_E_Base_GAZ</span> <span class="op">=></span> <span class="ident">Emoji</span>, <span class="comment">// rule WB14</span>
<span class="kw">_</span> <span class="op">=></span> {
<span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">ncat</span>) <span class="op">=</span> <span class="self">self</span>.<span class="ident">get_next_cat</span>(<span class="ident">idx</span>) { <span class="comment">// rule WB4</span>
<span class="kw">if</span> <span class="ident">ncat</span> <span class="op">==</span> <span class="ident">wd</span>::<span class="ident">WC_Format</span> <span class="op">||</span> <span class="ident">ncat</span> <span class="op">==</span> <span class="ident">wd</span>::<span class="ident">WC_Extend</span> <span class="op">||</span> <span class="ident">ncat</span> <span class="op">==</span> <span class="ident">wd</span>::<span class="ident">WC_ZWJ</span> {
<span class="ident">state</span> <span class="op">=</span> <span class="ident">FormatExtend</span>(<span class="ident">AcceptNone</span>);
<span class="self">self</span>.<span class="ident">cat</span> <span class="op">=</span> <span class="prelude-val">Some</span>(<span class="ident">ncat</span>);
<span class="kw">continue</span>;
}
}
<span class="kw">break</span>; <span class="comment">// rule WB999</span>
}
},
<span class="ident">Zwj</span> <span class="op">=></span> {
<span class="comment">// We already handle WB3c above. At this point,</span>
<span class="comment">// the current category is not GAZ or EBG,</span>
<span class="comment">// or the previous character was not actually a ZWJ</span>
<span class="ident">take_curr</span> <span class="op">=</span> <span class="bool-val">false</span>;
<span class="kw">break</span>;
}
<span class="ident">Letter</span> <span class="op">|</span> <span class="ident">HLetter</span> <span class="op">=></span> <span class="kw">match</span> <span class="ident">cat</span> {
<span class="ident">wd</span>::<span class="ident">WC_ALetter</span> <span class="op">=></span> <span class="ident">Letter</span>, <span class="comment">// rule WB5</span>
<span class="ident">wd</span>::<span class="ident">WC_Hebrew_Letter</span> <span class="op">=></span> <span class="ident">HLetter</span>, <span class="comment">// rule WB5</span>
<span class="ident">wd</span>::<span class="ident">WC_Numeric</span> <span class="op">=></span> <span class="ident">Numeric</span>, <span class="comment">// rule WB9</span>
<span class="ident">wd</span>::<span class="ident">WC_ExtendNumLet</span> <span class="op">=></span> <span class="ident">ExtendNumLet</span>, <span class="comment">// rule WB13a</span>
<span class="ident">wd</span>::<span class="ident">WC_Double_Quote</span> <span class="kw">if</span> <span class="ident">state</span> <span class="op">==</span> <span class="ident">HLetter</span> <span class="op">=></span> {
<span class="ident">savecat</span> <span class="op">=</span> <span class="ident">cat</span>;
<span class="ident">saveidx</span> <span class="op">=</span> <span class="ident">idx</span>;
<span class="ident">FormatExtend</span>(<span class="ident">RequireHLetter</span>) <span class="comment">// rule WB7b</span>
},
<span class="ident">wd</span>::<span class="ident">WC_Single_Quote</span> <span class="kw">if</span> <span class="ident">state</span> <span class="op">==</span> <span class="ident">HLetter</span> <span class="op">=></span> {
<span class="ident">FormatExtend</span>(<span class="ident">AcceptQLetter</span>) <span class="comment">// rule WB7a</span>
},
<span class="ident">wd</span>::<span class="ident">WC_MidLetter</span> <span class="op">|</span> <span class="ident">wd</span>::<span class="ident">WC_MidNumLet</span> <span class="op">|</span> <span class="ident">wd</span>::<span class="ident">WC_Single_Quote</span> <span class="op">=></span> {
<span class="ident">savecat</span> <span class="op">=</span> <span class="ident">cat</span>;
<span class="ident">saveidx</span> <span class="op">=</span> <span class="ident">idx</span>;
<span class="ident">FormatExtend</span>(<span class="ident">RequireLetter</span>) <span class="comment">// rule WB6</span>
},
<span class="kw">_</span> <span class="op">=></span> {
<span class="ident">take_curr</span> <span class="op">=</span> <span class="bool-val">false</span>;
<span class="kw">break</span>;
}
},
<span class="ident">Numeric</span> <span class="op">=></span> <span class="kw">match</span> <span class="ident">cat</span> {
<span class="ident">wd</span>::<span class="ident">WC_Numeric</span> <span class="op">=></span> <span class="ident">Numeric</span>, <span class="comment">// rule WB8</span>
<span class="ident">wd</span>::<span class="ident">WC_ALetter</span> <span class="op">=></span> <span class="ident">Letter</span>, <span class="comment">// rule WB10</span>
<span class="ident">wd</span>::<span class="ident">WC_Hebrew_Letter</span> <span class="op">=></span> <span class="ident">HLetter</span>, <span class="comment">// rule WB10</span>
<span class="ident">wd</span>::<span class="ident">WC_ExtendNumLet</span> <span class="op">=></span> <span class="ident">ExtendNumLet</span>, <span class="comment">// rule WB13a</span>
<span class="ident">wd</span>::<span class="ident">WC_MidNum</span> <span class="op">|</span> <span class="ident">wd</span>::<span class="ident">WC_MidNumLet</span> <span class="op">|</span> <span class="ident">wd</span>::<span class="ident">WC_Single_Quote</span> <span class="op">=></span> {
<span class="ident">savecat</span> <span class="op">=</span> <span class="ident">cat</span>;
<span class="ident">saveidx</span> <span class="op">=</span> <span class="ident">idx</span>;
<span class="ident">FormatExtend</span>(<span class="ident">RequireNumeric</span>) <span class="comment">// rule WB12</span>
},
<span class="kw">_</span> <span class="op">=></span> {
<span class="ident">take_curr</span> <span class="op">=</span> <span class="bool-val">false</span>;
<span class="kw">break</span>;
}
},
<span class="ident">Katakana</span> <span class="op">=></span> <span class="kw">match</span> <span class="ident">cat</span> {
<span class="ident">wd</span>::<span class="ident">WC_Katakana</span> <span class="op">=></span> <span class="ident">Katakana</span>, <span class="comment">// rule WB13</span>
<span class="ident">wd</span>::<span class="ident">WC_ExtendNumLet</span> <span class="op">=></span> <span class="ident">ExtendNumLet</span>, <span class="comment">// rule WB13a</span>
<span class="kw">_</span> <span class="op">=></span> {
<span class="ident">take_curr</span> <span class="op">=</span> <span class="bool-val">false</span>;
<span class="kw">break</span>;
}
},
<span class="ident">ExtendNumLet</span> <span class="op">=></span> <span class="kw">match</span> <span class="ident">cat</span> {
<span class="ident">wd</span>::<span class="ident">WC_ExtendNumLet</span> <span class="op">=></span> <span class="ident">ExtendNumLet</span>, <span class="comment">// rule WB13a</span>
<span class="ident">wd</span>::<span class="ident">WC_ALetter</span> <span class="op">=></span> <span class="ident">Letter</span>, <span class="comment">// rule WB13b</span>
<span class="ident">wd</span>::<span class="ident">WC_Hebrew_Letter</span> <span class="op">=></span> <span class="ident">HLetter</span>, <span class="comment">// rule WB13b</span>
<span class="ident">wd</span>::<span class="ident">WC_Numeric</span> <span class="op">=></span> <span class="ident">Numeric</span>, <span class="comment">// rule WB13b</span>
<span class="ident">wd</span>::<span class="ident">WC_Katakana</span> <span class="op">=></span> <span class="ident">Katakana</span>, <span class="comment">// rule WB13b</span>
<span class="kw">_</span> <span class="op">=></span> {
<span class="ident">take_curr</span> <span class="op">=</span> <span class="bool-val">false</span>;
<span class="kw">break</span>;
}
},
<span class="ident">Regional</span>(<span class="ident">RegionalState</span>::<span class="ident">Full</span>) <span class="op">=></span> {
<span class="comment">// if it reaches here we've gone too far,</span>
<span class="comment">// a full flag can only compose with ZWJ/Extend/Format</span>
<span class="comment">// proceeding it.</span>
<span class="ident">take_curr</span> <span class="op">=</span> <span class="bool-val">false</span>;
<span class="kw">break</span>;
}
<span class="ident">Regional</span>(<span class="ident">RegionalState</span>::<span class="ident">Half</span>) <span class="op">=></span> <span class="kw">match</span> <span class="ident">cat</span> {
<span class="ident">wd</span>::<span class="ident">WC_Regional_Indicator</span> <span class="op">=></span> <span class="ident">Regional</span>(<span class="ident">RegionalState</span>::<span class="ident">Full</span>), <span class="comment">// rule WB13c</span>
<span class="kw">_</span> <span class="op">=></span> {
<span class="ident">take_curr</span> <span class="op">=</span> <span class="bool-val">false</span>;
<span class="kw">break</span>;
}
},
<span class="ident">Regional</span>(<span class="kw">_</span>) <span class="op">=></span> <span class="macro">unreachable</span><span class="macro">!</span>(<span class="string">"RegionalState::Unknown should not occur on forward iteration"</span>),
<span class="ident">Emoji</span> <span class="op">=></span> <span class="kw">match</span> <span class="ident">cat</span> { <span class="comment">// rule WB14</span>
<span class="ident">wd</span>::<span class="ident">WC_E_Modifier</span> <span class="op">=></span> <span class="ident">state</span>,
<span class="kw">_</span> <span class="op">=></span> {
<span class="ident">take_curr</span> <span class="op">=</span> <span class="bool-val">false</span>;
<span class="kw">break</span>;
}
},
<span class="ident">FormatExtend</span>(<span class="ident">t</span>) <span class="op">=></span> <span class="kw">match</span> <span class="ident">t</span> { <span class="comment">// handle FormatExtends depending on what type</span>
<span class="ident">RequireNumeric</span> <span class="kw">if</span> <span class="ident">cat</span> <span class="op">==</span> <span class="ident">wd</span>::<span class="ident">WC_Numeric</span> <span class="op">=></span> <span class="ident">Numeric</span>, <span class="comment">// rule WB11</span>
<span class="ident">RequireLetter</span> <span class="op">|</span> <span class="ident">AcceptQLetter</span> <span class="kw">if</span> <span class="ident">cat</span> <span class="op">==</span> <span class="ident">wd</span>::<span class="ident">WC_ALetter</span> <span class="op">=></span> <span class="ident">Letter</span>, <span class="comment">// rule WB7</span>
<span class="ident">RequireLetter</span> <span class="op">|</span> <span class="ident">AcceptQLetter</span> <span class="kw">if</span> <span class="ident">cat</span> <span class="op">==</span> <span class="ident">wd</span>::<span class="ident">WC_Hebrew_Letter</span> <span class="op">=></span> <span class="ident">HLetter</span>, <span class="comment">// WB7a</span>
<span class="ident">RequireHLetter</span> <span class="kw">if</span> <span class="ident">cat</span> <span class="op">==</span> <span class="ident">wd</span>::<span class="ident">WC_Hebrew_Letter</span> <span class="op">=></span> <span class="ident">HLetter</span>, <span class="comment">// rule WB7b</span>
<span class="ident">AcceptNone</span> <span class="op">|</span> <span class="ident">AcceptQLetter</span> <span class="op">=></span> {
<span class="ident">take_curr</span> <span class="op">=</span> <span class="bool-val">false</span>; <span class="comment">// emit all the Format|Extend characters</span>
<span class="ident">take_cat</span> <span class="op">=</span> <span class="bool-val">false</span>;
<span class="kw">break</span>;
},
<span class="kw">_</span> <span class="op">=></span> <span class="kw">break</span> <span class="comment">// rewind (in if statement below)</span>
}
}
}
<span class="kw">if</span> <span class="kw">let</span> <span class="ident">FormatExtend</span>(<span class="ident">t</span>) <span class="op">=</span> <span class="ident">state</span> {
<span class="comment">// we were looking for something and didn't find it; we have to back up</span>
<span class="kw">if</span> <span class="ident">t</span> <span class="op">==</span> <span class="ident">RequireLetter</span> <span class="op">||</span> <span class="ident">t</span> <span class="op">==</span> <span class="ident">RequireHLetter</span> <span class="op">||</span> <span class="ident">t</span> <span class="op">==</span> <span class="ident">RequireNumeric</span> {
<span class="ident">idx</span> <span class="op">=</span> <span class="ident">saveidx</span>;
<span class="ident">cat</span> <span class="op">=</span> <span class="ident">savecat</span>;
<span class="ident">take_curr</span> <span class="op">=</span> <span class="bool-val">false</span>;
}
}
<span class="self">self</span>.<span class="ident">cat</span> <span class="op">=</span> <span class="kw">if</span> <span class="ident">take_curr</span> {
<span class="ident">idx</span> <span class="op">=</span> <span class="ident">idx</span> <span class="op">+</span> <span class="self">self</span>.<span class="ident">string</span>[<span class="ident">idx</span>..].<span class="ident">chars</span>().<span class="ident">next</span>().<span class="ident">unwrap</span>().<span class="ident">len_utf8</span>();
<span class="prelude-val">None</span>
} <span class="kw">else</span> <span class="kw">if</span> <span class="ident">take_cat</span> {
<span class="prelude-val">Some</span>(<span class="ident">cat</span>)
} <span class="kw">else</span> {
<span class="prelude-val">None</span>
};
<span class="kw">let</span> <span class="ident">retstr</span> <span class="op">=</span> <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">string</span>[..<span class="ident">idx</span>];
<span class="self">self</span>.<span class="ident">string</span> <span class="op">=</span> <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">string</span>[<span class="ident">idx</span>..];
<span class="prelude-val">Some</span>(<span class="ident">retstr</span>)
}
}
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> <span class="ident">DoubleEndedIterator</span> <span class="kw">for</span> <span class="ident">UWordBounds</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> {
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">next_back</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="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">str</span><span class="op">></span> {
<span class="kw">use</span> <span class="self">self</span>::<span class="ident">UWordBoundsState</span>::<span class="kw-2">*</span>;
<span class="kw">use</span> <span class="self">self</span>::<span class="ident">FormatExtendType</span>::<span class="kw-2">*</span>;
<span class="kw">use</span> <span class="ident">tables</span>::<span class="ident">word</span> <span class="kw">as</span> <span class="ident">wd</span>;
<span class="kw">if</span> <span class="self">self</span>.<span class="ident">string</span>.<span class="ident">len</span>() <span class="op">==</span> <span class="number">0</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">take_curr</span> <span class="op">=</span> <span class="bool-val">true</span>;
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">take_cat</span> <span class="op">=</span> <span class="bool-val">true</span>;
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">idx</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">string</span>.<span class="ident">len</span>();
<span class="ident">idx</span> <span class="op">-=</span> <span class="self">self</span>.<span class="ident">string</span>.<span class="ident">chars</span>().<span class="ident">next_back</span>().<span class="ident">unwrap</span>().<span class="ident">len_utf8</span>();
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">previdx</span> <span class="op">=</span> <span class="ident">idx</span>;
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">saveidx</span> <span class="op">=</span> <span class="ident">idx</span>;
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">state</span> <span class="op">=</span> <span class="ident">Start</span>;
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">savestate</span> <span class="op">=</span> <span class="ident">Start</span>;
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">cat</span> <span class="op">=</span> <span class="ident">wd</span>::<span class="ident">WC_Any</span>;
<span class="kw">for</span> (<span class="ident">curr</span>, <span class="ident">ch</span>) <span class="kw">in</span> <span class="self">self</span>.<span class="ident">string</span>.<span class="ident">char_indices</span>().<span class="ident">rev</span>() {
<span class="ident">previdx</span> <span class="op">=</span> <span class="ident">idx</span>;
<span class="ident">idx</span> <span class="op">=</span> <span class="ident">curr</span>;
<span class="comment">// if there's a category cached, grab it</span>
<span class="ident">cat</span> <span class="op">=</span> <span class="kw">match</span> <span class="self">self</span>.<span class="ident">catb</span> {
<span class="prelude-val">None</span> <span class="op">=></span> <span class="ident">wd</span>::<span class="ident">word_category</span>(<span class="ident">ch</span>),
<span class="kw">_</span> <span class="op">=></span> <span class="self">self</span>.<span class="ident">catb</span>.<span class="ident">take</span>().<span class="ident">unwrap</span>()
};
<span class="ident">take_cat</span> <span class="op">=</span> <span class="bool-val">true</span>;
<span class="comment">// backward iterator over word boundaries. Mostly the same as the forward</span>
<span class="comment">// iterator, with two weirdnesses:</span>
<span class="comment">// (1) If we encounter a single quote in the Start state, we have to check for a</span>
<span class="comment">// Hebrew Letter immediately before it.</span>
<span class="comment">// (2) Format and Extend char handling takes some gymnastics.</span>
<span class="kw">if</span> <span class="ident">cat</span> <span class="op">==</span> <span class="ident">wd</span>::<span class="ident">WC_Extend</span>
<span class="op">||</span> <span class="ident">cat</span> <span class="op">==</span> <span class="ident">wd</span>::<span class="ident">WC_Format</span>
<span class="op">||</span> (<span class="ident">cat</span> <span class="op">==</span> <span class="ident">wd</span>::<span class="ident">WC_ZWJ</span> <span class="op">&&</span> <span class="ident">state</span> <span class="op">!=</span> <span class="ident">Zwj</span>) { <span class="comment">// WB3c has more priority so we should not</span>
<span class="comment">// fold in that case</span>
<span class="kw">if</span> <span class="kw">match</span> <span class="ident">state</span> {
<span class="ident">FormatExtend</span>(<span class="kw">_</span>) <span class="op">|</span> <span class="ident">Start</span> <span class="op">=></span> <span class="bool-val">false</span>,
<span class="kw">_</span> <span class="op">=></span> <span class="bool-val">true</span>
} {
<span class="ident">saveidx</span> <span class="op">=</span> <span class="ident">previdx</span>;
<span class="ident">savestate</span> <span class="op">=</span> <span class="ident">state</span>;
<span class="ident">state</span> <span class="op">=</span> <span class="ident">FormatExtend</span>(<span class="ident">AcceptNone</span>);
}
<span class="kw">if</span> <span class="ident">state</span> <span class="op">!=</span> <span class="ident">Start</span> {
<span class="kw">continue</span>;
}
} <span class="kw">else</span> <span class="kw">if</span> <span class="ident">state</span> <span class="op">==</span> <span class="ident">FormatExtend</span>(<span class="ident">AcceptNone</span>) {
<span class="comment">// finished a scan of some Format|Extend chars, restore previous state</span>
<span class="ident">state</span> <span class="op">=</span> <span class="ident">savestate</span>;
<span class="ident">previdx</span> <span class="op">=</span> <span class="ident">saveidx</span>;
<span class="ident">take_cat</span> <span class="op">=</span> <span class="bool-val">false</span>;
}
<span class="comment">// Don't use `continue` in this match without updating `catb`</span>
<span class="ident">state</span> <span class="op">=</span> <span class="kw">match</span> <span class="ident">state</span> {
<span class="ident">Start</span> <span class="op">|</span> <span class="ident">FormatExtend</span>(<span class="ident">AcceptAny</span>) <span class="op">=></span> <span class="kw">match</span> <span class="ident">cat</span> {
<span class="ident">wd</span>::<span class="ident">WC_ALetter</span> <span class="op">=></span> <span class="ident">Letter</span>, <span class="comment">// rule WB5, WB7, WB10, WB13b</span>
<span class="ident">wd</span>::<span class="ident">WC_Hebrew_Letter</span> <span class="op">=></span> <span class="ident">HLetter</span>, <span class="comment">// rule WB5, WB7, WB7c, WB10, WB13b</span>
<span class="ident">wd</span>::<span class="ident">WC_Numeric</span> <span class="op">=></span> <span class="ident">Numeric</span>, <span class="comment">// rule WB8, WB9, WB11, WB13b</span>
<span class="ident">wd</span>::<span class="ident">WC_Katakana</span> <span class="op">=></span> <span class="ident">Katakana</span>, <span class="comment">// rule WB13, WB13b</span>
<span class="ident">wd</span>::<span class="ident">WC_ExtendNumLet</span> <span class="op">=></span> <span class="ident">ExtendNumLet</span>, <span class="comment">// rule WB13a</span>
<span class="ident">wd</span>::<span class="ident">WC_Regional_Indicator</span> <span class="op">=></span> <span class="ident">Regional</span>(<span class="ident">RegionalState</span>::<span class="ident">Unknown</span>), <span class="comment">// rule WB13c</span>
<span class="ident">wd</span>::<span class="ident">WC_Glue_After_Zwj</span> <span class="op">|</span> <span class="ident">wd</span>::<span class="ident">WC_E_Base_GAZ</span> <span class="op">=></span> <span class="ident">Zwj</span>, <span class="comment">// rule WB3c</span>
<span class="comment">// rule WB4:</span>
<span class="ident">wd</span>::<span class="ident">WC_Extend</span> <span class="op">|</span> <span class="ident">wd</span>::<span class="ident">WC_Format</span> <span class="op">|</span> <span class="ident">wd</span>::<span class="ident">WC_ZWJ</span> <span class="op">=></span> <span class="ident">FormatExtend</span>(<span class="ident">AcceptAny</span>),
<span class="ident">wd</span>::<span class="ident">WC_Single_Quote</span> <span class="op">=></span> {
<span class="ident">saveidx</span> <span class="op">=</span> <span class="ident">idx</span>;
<span class="ident">FormatExtend</span>(<span class="ident">AcceptQLetter</span>) <span class="comment">// rule WB7a</span>
},
<span class="ident">wd</span>::<span class="ident">WC_E_Modifier</span> <span class="op">=></span> <span class="ident">Emoji</span>, <span class="comment">// rule WB14</span>
<span class="ident">wd</span>::<span class="ident">WC_CR</span> <span class="op">|</span> <span class="ident">wd</span>::<span class="ident">WC_LF</span> <span class="op">|</span> <span class="ident">wd</span>::<span class="ident">WC_Newline</span> <span class="op">=></span> {
<span class="kw">if</span> <span class="ident">state</span> <span class="op">==</span> <span class="ident">Start</span> {
<span class="kw">if</span> <span class="ident">cat</span> <span class="op">==</span> <span class="ident">wd</span>::<span class="ident">WC_LF</span> {
<span class="ident">idx</span> <span class="op">-=</span> <span class="kw">match</span> <span class="self">self</span>.<span class="ident">get_prev_cat</span>(<span class="ident">idx</span>) {
<span class="prelude-val">Some</span>(<span class="ident">pcat</span>) <span class="kw">if</span> <span class="ident">pcat</span> <span class="op">==</span> <span class="ident">wd</span>::<span class="ident">WC_CR</span> <span class="op">=></span> <span class="number">1</span>, <span class="comment">// rule WB3</span>
<span class="kw">_</span> <span class="op">=></span> <span class="number">0</span>
};
}
} <span class="kw">else</span> {
<span class="ident">take_curr</span> <span class="op">=</span> <span class="bool-val">false</span>;
}
<span class="kw">break</span>; <span class="comment">// rule WB3a</span>
},
<span class="kw">_</span> <span class="op">=></span> <span class="kw">break</span> <span class="comment">// rule WB999</span>
},
<span class="ident">Zwj</span> <span class="op">=></span> <span class="kw">match</span> <span class="ident">cat</span> { <span class="comment">// rule WB3c</span>
<span class="ident">wd</span>::<span class="ident">WC_ZWJ</span> <span class="op">=></span> {
<span class="ident">FormatExtend</span>(<span class="ident">AcceptAny</span>)
}
<span class="kw">_</span> <span class="op">=></span> {
<span class="ident">take_curr</span> <span class="op">=</span> <span class="bool-val">false</span>;
<span class="kw">break</span>;
}
},
<span class="ident">Letter</span> <span class="op">|</span> <span class="ident">HLetter</span> <span class="op">=></span> <span class="kw">match</span> <span class="ident">cat</span> {
<span class="ident">wd</span>::<span class="ident">WC_ALetter</span> <span class="op">=></span> <span class="ident">Letter</span>, <span class="comment">// rule WB5</span>
<span class="ident">wd</span>::<span class="ident">WC_Hebrew_Letter</span> <span class="op">=></span> <span class="ident">HLetter</span>, <span class="comment">// rule WB5</span>
<span class="ident">wd</span>::<span class="ident">WC_Numeric</span> <span class="op">=></span> <span class="ident">Numeric</span>, <span class="comment">// rule WB10</span>
<span class="ident">wd</span>::<span class="ident">WC_ExtendNumLet</span> <span class="op">=></span> <span class="ident">ExtendNumLet</span>, <span class="comment">// rule WB13b</span>
<span class="ident">wd</span>::<span class="ident">WC_Double_Quote</span> <span class="kw">if</span> <span class="ident">state</span> <span class="op">==</span> <span class="ident">HLetter</span> <span class="op">=></span> {
<span class="ident">saveidx</span> <span class="op">=</span> <span class="ident">previdx</span>;
<span class="ident">FormatExtend</span>(<span class="ident">RequireHLetter</span>) <span class="comment">// rule WB7c</span>
},
<span class="ident">wd</span>::<span class="ident">WC_MidLetter</span> <span class="op">|</span> <span class="ident">wd</span>::<span class="ident">WC_MidNumLet</span> <span class="op">|</span> <span class="ident">wd</span>::<span class="ident">WC_Single_Quote</span> <span class="op">=></span> {
<span class="ident">saveidx</span> <span class="op">=</span> <span class="ident">previdx</span>;
<span class="ident">FormatExtend</span>(<span class="ident">RequireLetter</span>) <span class="comment">// rule WB7</span>
},
<span class="kw">_</span> <span class="op">=></span> {
<span class="ident">take_curr</span> <span class="op">=</span> <span class="bool-val">false</span>;
<span class="kw">break</span>;
}
},
<span class="ident">Numeric</span> <span class="op">=></span> <span class="kw">match</span> <span class="ident">cat</span> {
<span class="ident">wd</span>::<span class="ident">WC_Numeric</span> <span class="op">=></span> <span class="ident">Numeric</span>, <span class="comment">// rule WB8</span>
<span class="ident">wd</span>::<span class="ident">WC_ALetter</span> <span class="op">=></span> <span class="ident">Letter</span>, <span class="comment">// rule WB9</span>
<span class="ident">wd</span>::<span class="ident">WC_Hebrew_Letter</span> <span class="op">=></span> <span class="ident">HLetter</span>, <span class="comment">// rule WB9</span>
<span class="ident">wd</span>::<span class="ident">WC_ExtendNumLet</span> <span class="op">=></span> <span class="ident">ExtendNumLet</span>, <span class="comment">// rule WB13b</span>
<span class="ident">wd</span>::<span class="ident">WC_MidNum</span> <span class="op">|</span> <span class="ident">wd</span>::<span class="ident">WC_MidNumLet</span> <span class="op">|</span> <span class="ident">wd</span>::<span class="ident">WC_Single_Quote</span> <span class="op">=></span> {
<span class="ident">saveidx</span> <span class="op">=</span> <span class="ident">previdx</span>;
<span class="ident">FormatExtend</span>(<span class="ident">RequireNumeric</span>) <span class="comment">// rule WB11</span>
},
<span class="kw">_</span> <span class="op">=></span> {
<span class="ident">take_curr</span> <span class="op">=</span> <span class="bool-val">false</span>;
<span class="kw">break</span>;
}
},
<span class="ident">Katakana</span> <span class="op">=></span> <span class="kw">match</span> <span class="ident">cat</span> {
<span class="ident">wd</span>::<span class="ident">WC_Katakana</span> <span class="op">=></span> <span class="ident">Katakana</span>, <span class="comment">// rule WB13</span>
<span class="ident">wd</span>::<span class="ident">WC_ExtendNumLet</span> <span class="op">=></span> <span class="ident">ExtendNumLet</span>, <span class="comment">// rule WB13b</span>
<span class="kw">_</span> <span class="op">=></span> {
<span class="ident">take_curr</span> <span class="op">=</span> <span class="bool-val">false</span>;
<span class="kw">break</span>;
}
},
<span class="ident">ExtendNumLet</span> <span class="op">=></span> <span class="kw">match</span> <span class="ident">cat</span> {
<span class="ident">wd</span>::<span class="ident">WC_ExtendNumLet</span> <span class="op">=></span> <span class="ident">ExtendNumLet</span>, <span class="comment">// rule WB13a</span>
<span class="ident">wd</span>::<span class="ident">WC_ALetter</span> <span class="op">=></span> <span class="ident">Letter</span>, <span class="comment">// rule WB13a</span>
<span class="ident">wd</span>::<span class="ident">WC_Hebrew_Letter</span> <span class="op">=></span> <span class="ident">HLetter</span>, <span class="comment">// rule WB13a</span>
<span class="ident">wd</span>::<span class="ident">WC_Numeric</span> <span class="op">=></span> <span class="ident">Numeric</span>, <span class="comment">// rule WB13a</span>
<span class="ident">wd</span>::<span class="ident">WC_Katakana</span> <span class="op">=></span> <span class="ident">Katakana</span>, <span class="comment">// rule WB13a</span>
<span class="kw">_</span> <span class="op">=></span> {
<span class="ident">take_curr</span> <span class="op">=</span> <span class="bool-val">false</span>;
<span class="kw">break</span>;
}
},
<span class="ident">Regional</span>(<span class="kw-2">mut</span> <span class="ident">regional_state</span>) <span class="op">=></span> <span class="kw">match</span> <span class="ident">cat</span> {
<span class="comment">// rule WB13c</span>
<span class="ident">wd</span>::<span class="ident">WC_Regional_Indicator</span> <span class="op">=></span> {
<span class="kw">if</span> <span class="ident">regional_state</span> <span class="op">==</span> <span class="ident">RegionalState</span>::<span class="ident">Unknown</span> {
<span class="kw">let</span> <span class="ident">count</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">string</span>[..<span class="ident">previdx</span>]
.<span class="ident">chars</span>().<span class="ident">rev</span>()
.<span class="ident">map</span>(<span class="op">|</span><span class="ident">c</span><span class="op">|</span> <span class="ident">wd</span>::<span class="ident">word_category</span>(<span class="ident">c</span>))
.<span class="ident">filter</span>(<span class="op">|</span><span class="kw-2">&</span><span class="ident">c</span><span class="op">|</span> <span class="op">!</span> (<span class="ident">c</span> <span class="op">==</span> <span class="ident">wd</span>::<span class="ident">WC_ZWJ</span> <span class="op">||</span> <span class="ident">c</span> <span class="op">==</span> <span class="ident">wd</span>::<span class="ident">WC_Extend</span> <span class="op">||</span> <span class="ident">c</span> <span class="op">==</span> <span class="ident">wd</span>::<span class="ident">WC_Format</span>))
.<span class="ident">take_while</span>(<span class="op">|</span><span class="kw-2">&</span><span class="ident">c</span><span class="op">|</span> <span class="ident">c</span> <span class="op">==</span> <span class="ident">wd</span>::<span class="ident">WC_Regional_Indicator</span>)
.<span class="ident">count</span>();
<span class="ident">regional_state</span> <span class="op">=</span> <span class="kw">if</span> <span class="ident">count</span> <span class="op">%</span> <span class="number">2</span> <span class="op">==</span> <span class="number">0</span> {
<span class="ident">RegionalState</span>::<span class="ident">Full</span>
} <span class="kw">else</span> {
<span class="ident">RegionalState</span>::<span class="ident">Half</span>
};
}
<span class="kw">if</span> <span class="ident">regional_state</span> <span class="op">==</span> <span class="ident">RegionalState</span>::<span class="ident">Full</span> {
<span class="ident">take_curr</span> <span class="op">=</span> <span class="bool-val">false</span>;
<span class="kw">break</span>;
} <span class="kw">else</span> {
<span class="ident">Regional</span>(<span class="ident">RegionalState</span>::<span class="ident">Full</span>)
}
}
<span class="kw">_</span> <span class="op">=></span> {
<span class="ident">take_curr</span> <span class="op">=</span> <span class="bool-val">false</span>;
<span class="kw">break</span>;
}
},
<span class="ident">Emoji</span> <span class="op">=></span> <span class="kw">match</span> <span class="ident">cat</span> { <span class="comment">// rule WB14</span>
<span class="ident">wd</span>::<span class="ident">WC_E_Base</span> <span class="op">|</span> <span class="ident">wd</span>::<span class="ident">WC_E_Base_GAZ</span> <span class="op">=></span> {
<span class="ident">Zwj</span>
},
<span class="kw">_</span> <span class="op">=></span> {
<span class="ident">take_curr</span> <span class="op">=</span> <span class="bool-val">false</span>;
<span class="kw">break</span>;
}
},
<span class="ident">FormatExtend</span>(<span class="ident">t</span>) <span class="op">=></span> <span class="kw">match</span> <span class="ident">t</span> {
<span class="ident">RequireNumeric</span> <span class="kw">if</span> <span class="ident">cat</span> <span class="op">==</span> <span class="ident">wd</span>::<span class="ident">WC_Numeric</span> <span class="op">=></span> <span class="ident">Numeric</span>, <span class="comment">// rule WB12</span>
<span class="ident">RequireLetter</span> <span class="kw">if</span> <span class="ident">cat</span> <span class="op">==</span> <span class="ident">wd</span>::<span class="ident">WC_ALetter</span> <span class="op">=></span> <span class="ident">Letter</span>, <span class="comment">// rule WB6</span>
<span class="ident">RequireLetter</span> <span class="kw">if</span> <span class="ident">cat</span> <span class="op">==</span> <span class="ident">wd</span>::<span class="ident">WC_Hebrew_Letter</span> <span class="op">=></span> <span class="ident">HLetter</span>, <span class="comment">// rule WB6</span>
<span class="ident">AcceptQLetter</span> <span class="kw">if</span> <span class="ident">cat</span> <span class="op">==</span> <span class="ident">wd</span>::<span class="ident">WC_Hebrew_Letter</span> <span class="op">=></span> <span class="ident">HLetter</span>, <span class="comment">// rule WB7a</span>
<span class="ident">RequireHLetter</span> <span class="kw">if</span> <span class="ident">cat</span> <span class="op">==</span> <span class="ident">wd</span>::<span class="ident">WC_Hebrew_Letter</span> <span class="op">=></span> <span class="ident">HLetter</span>, <span class="comment">// rule WB7b</span>
<span class="kw">_</span> <span class="op">=></span> <span class="kw">break</span> <span class="comment">// backtrack will happens</span>
}
}
}
<span class="kw">if</span> <span class="kw">let</span> <span class="ident">FormatExtend</span>(<span class="ident">t</span>) <span class="op">=</span> <span class="ident">state</span> {
<span class="comment">// if we required something but didn't find it, backtrack</span>
<span class="kw">if</span> <span class="ident">t</span> <span class="op">==</span> <span class="ident">RequireLetter</span> <span class="op">||</span> <span class="ident">t</span> <span class="op">==</span> <span class="ident">RequireHLetter</span> <span class="op">||</span>
<span class="ident">t</span> <span class="op">==</span> <span class="ident">RequireNumeric</span> <span class="op">||</span> <span class="ident">t</span> <span class="op">==</span> <span class="ident">AcceptNone</span> <span class="op">||</span> <span class="ident">t</span> <span class="op">==</span> <span class="ident">AcceptQLetter</span> {
<span class="ident">previdx</span> <span class="op">=</span> <span class="ident">saveidx</span>;
<span class="ident">take_cat</span> <span class="op">=</span> <span class="bool-val">false</span>;
<span class="ident">take_curr</span> <span class="op">=</span> <span class="bool-val">false</span>;
}
}
<span class="self">self</span>.<span class="ident">catb</span> <span class="op">=</span> <span class="kw">if</span> <span class="ident">take_curr</span> {
<span class="prelude-val">None</span>
} <span class="kw">else</span> {
<span class="ident">idx</span> <span class="op">=</span> <span class="ident">previdx</span>;
<span class="kw">if</span> <span class="ident">take_cat</span> {
<span class="prelude-val">Some</span>(<span class="ident">cat</span>)
} <span class="kw">else</span> {
<span class="prelude-val">None</span>
}
};
<span class="kw">let</span> <span class="ident">retstr</span> <span class="op">=</span> <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">string</span>[<span class="ident">idx</span>..];
<span class="self">self</span>.<span class="ident">string</span> <span class="op">=</span> <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">string</span>[..<span class="ident">idx</span>];
<span class="prelude-val">Some</span>(<span class="ident">retstr</span>)
}
}
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> <span class="ident">UWordBounds</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> {
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="doccomment">/// View the underlying data (the part yet to be iterated) as a slice of the original string.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```rust</span>
<span class="doccomment">/// # use unicode_segmentation::UnicodeSegmentation;</span>
<span class="doccomment">/// let mut iter = "Hello world".split_word_bounds();</span>
<span class="doccomment">/// assert_eq!(iter.as_str(), "Hello world");</span>
<span class="doccomment">/// iter.next();</span>
<span class="doccomment">/// assert_eq!(iter.as_str(), " world");</span>
<span class="doccomment">/// iter.next();</span>
<span class="doccomment">/// assert_eq!(iter.as_str(), "world");</span>
<span class="doccomment">/// ```</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">as_str</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">str</span> {
<span class="self">self</span>.<span class="ident">string</span>
}
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">get_next_cat</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">idx</span>: <span class="ident">usize</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">WordCat</span><span class="op">></span> {
<span class="kw">use</span> <span class="ident">tables</span>::<span class="ident">word</span> <span class="kw">as</span> <span class="ident">wd</span>;
<span class="kw">let</span> <span class="ident">nidx</span> <span class="op">=</span> <span class="ident">idx</span> <span class="op">+</span> <span class="self">self</span>.<span class="ident">string</span>[<span class="ident">idx</span>..].<span class="ident">chars</span>().<span class="ident">next</span>().<span class="ident">unwrap</span>().<span class="ident">len_utf8</span>();
<span class="kw">if</span> <span class="ident">nidx</span> <span class="op"><</span> <span class="self">self</span>.<span class="ident">string</span>.<span class="ident">len</span>() {
<span class="kw">let</span> <span class="ident">nch</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">string</span>[<span class="ident">nidx</span>..].<span class="ident">chars</span>().<span class="ident">next</span>().<span class="ident">unwrap</span>();
<span class="prelude-val">Some</span>(<span class="ident">wd</span>::<span class="ident">word_category</span>(<span class="ident">nch</span>))
} <span class="kw">else</span> {
<span class="prelude-val">None</span>
}
}
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">get_prev_cat</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">idx</span>: <span class="ident">usize</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">WordCat</span><span class="op">></span> {
<span class="kw">use</span> <span class="ident">tables</span>::<span class="ident">word</span> <span class="kw">as</span> <span class="ident">wd</span>;
<span class="kw">if</span> <span class="ident">idx</span> <span class="op">></span> <span class="number">0</span> {
<span class="kw">let</span> <span class="ident">nch</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">string</span>[..<span class="ident">idx</span>].<span class="ident">chars</span>().<span class="ident">next_back</span>().<span class="ident">unwrap</span>();
<span class="prelude-val">Some</span>(<span class="ident">wd</span>::<span class="ident">word_category</span>(<span class="ident">nch</span>))
} <span class="kw">else</span> {
<span class="prelude-val">None</span>
}
}
}
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new_word_bounds</span><span class="op"><</span><span class="lifetime">'b</span><span class="op">></span>(<span class="ident">s</span>: <span class="kw-2">&</span><span class="lifetime">'b</span> <span class="ident">str</span>) <span class="op">-></span> <span class="ident">UWordBounds</span><span class="op"><</span><span class="lifetime">'b</span><span class="op">></span> {
<span class="ident">UWordBounds</span> { <span class="ident">string</span>: <span class="ident">s</span>, <span class="ident">cat</span>: <span class="prelude-val">None</span>, <span class="ident">catb</span>: <span class="prelude-val">None</span> }
}
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new_word_bound_indices</span><span class="op"><</span><span class="lifetime">'b</span><span class="op">></span>(<span class="ident">s</span>: <span class="kw-2">&</span><span class="lifetime">'b</span> <span class="ident">str</span>) <span class="op">-></span> <span class="ident">UWordBoundIndices</span><span class="op"><</span><span class="lifetime">'b</span><span class="op">></span> {
<span class="ident">UWordBoundIndices</span> { <span class="ident">start_offset</span>: <span class="ident">s</span>.<span class="ident">as_ptr</span>() <span class="kw">as</span> <span class="ident">usize</span>, <span class="ident">iter</span>: <span class="ident">new_word_bounds</span>(<span class="ident">s</span>) }
}
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new_unicode_words</span><span class="op"><</span><span class="lifetime">'b</span><span class="op">></span>(<span class="ident">s</span>: <span class="kw-2">&</span><span class="lifetime">'b</span> <span class="ident">str</span>) <span class="op">-></span> <span class="ident">UnicodeWords</span><span class="op"><</span><span class="lifetime">'b</span><span class="op">></span> {
<span class="kw">use</span> <span class="kw">super</span>::<span class="ident">UnicodeSegmentation</span>;
<span class="kw">use</span> <span class="ident">tables</span>::<span class="ident">util</span>::<span class="ident">is_alphanumeric</span>;
<span class="kw">fn</span> <span class="ident">has_alphanumeric</span>(<span class="ident">s</span>: <span class="op">&&</span><span class="ident">str</span>) <span class="op">-></span> <span class="ident">bool</span> { <span class="ident">s</span>.<span class="ident">chars</span>().<span class="ident">any</span>(<span class="op">|</span><span class="ident">c</span><span class="op">|</span> <span class="ident">is_alphanumeric</span>(<span class="ident">c</span>)) }
<span class="kw">let</span> <span class="ident">has_alphanumeric</span>: <span class="kw">fn</span>(<span class="op">&&</span><span class="ident">str</span>) <span class="op">-></span> <span class="ident">bool</span> <span class="op">=</span> <span class="ident">has_alphanumeric</span>; <span class="comment">// coerce to fn pointer</span>
<span class="ident">UnicodeWords</span> { <span class="ident">inner</span>: <span class="ident">s</span>.<span class="ident">split_word_bounds</span>().<span class="ident">filter</span>(<span class="ident">has_alphanumeric</span>) }
}
</pre></div>
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