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| </pre><pre class="rust"><code><span class="comment">// Copyright 2012-2014 The Rust Project Developers. See the COPYRIGHT |
| // file at the top-level directory of this distribution and at |
| // http://rust-lang.org/COPYRIGHT. |
| // |
| // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or |
| // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license |
| // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your |
| // option. This file may not be copied, modified, or distributed |
| // except according to those terms. |
| |
| </span><span class="kw">use </span>core::cmp; |
| <span class="kw">use </span>core::iter::Filter; |
| |
| <span class="comment">// All of the logic for forward iteration over sentences |
| </span><span class="kw">mod </span>fwd { |
| <span class="kw">use </span><span class="kw">crate</span>::tables::sentence::SentenceCat; |
| <span class="kw">use </span>core::cmp; |
| |
| <span class="comment">// Describe a parsed part of source string as described in this table: |
| // https://unicode.org/reports/tr29/#Default_Sentence_Boundaries |
| </span><span class="attribute">#[derive(Clone, Copy, PartialEq, Eq)] |
| </span><span class="kw">enum </span>StatePart { |
| Sot, |
| Eot, |
| Other, |
| CR, |
| LF, |
| Sep, |
| ATerm, |
| UpperLower, |
| ClosePlus, |
| SpPlus, |
| STerm, |
| } |
| |
| <span class="attribute">#[derive(Clone, PartialEq, Eq)] |
| </span><span class="kw">struct </span>SentenceBreaksState(<span class="kw">pub </span>[StatePart; <span class="number">4</span>]); |
| |
| <span class="kw">const </span>INITIAL_STATE: SentenceBreaksState = SentenceBreaksState([ |
| StatePart::Sot, |
| StatePart::Sot, |
| StatePart::Sot, |
| StatePart::Sot, |
| ]); |
| |
| <span class="attribute">#[derive(Clone)] |
| </span><span class="kw">pub struct </span>SentenceBreaks<<span class="lifetime">'a</span>> { |
| <span class="kw">pub </span>string: <span class="kw-2">&</span><span class="lifetime">'a </span>str, |
| pos: usize, |
| state: SentenceBreaksState, |
| } |
| |
| <span class="kw">impl </span>SentenceBreaksState { |
| <span class="comment">// Attempt to advance the internal state by one part |
| // Whitespace and some punctutation will be collapsed |
| </span><span class="kw">fn </span>next(<span class="kw-2">&</span><span class="self">self</span>, cat: SentenceCat) -> SentenceBreaksState { |
| <span class="kw">let </span><span class="kw-2">&</span>SentenceBreaksState(parts) = <span class="self">self</span>; |
| <span class="kw">let </span>parts = <span class="kw">match </span>(parts[<span class="number">3</span>], cat) { |
| (StatePart::ClosePlus, SentenceCat::SC_Close) => parts, |
| (StatePart::SpPlus, SentenceCat::SC_Sp) => parts, |
| <span class="kw">_ </span>=> [ |
| parts[<span class="number">1</span>], |
| parts[<span class="number">2</span>], |
| parts[<span class="number">3</span>], |
| <span class="kw">match </span>cat { |
| SentenceCat::SC_CR => StatePart::CR, |
| SentenceCat::SC_LF => StatePart::LF, |
| SentenceCat::SC_Sep => StatePart::Sep, |
| SentenceCat::SC_ATerm => StatePart::ATerm, |
| SentenceCat::SC_Upper | SentenceCat::SC_Lower => StatePart::UpperLower, |
| SentenceCat::SC_Close => StatePart::ClosePlus, |
| SentenceCat::SC_Sp => StatePart::SpPlus, |
| SentenceCat::SC_STerm => StatePart::STerm, |
| <span class="kw">_ </span>=> StatePart::Other, |
| }, |
| ], |
| }; |
| SentenceBreaksState(parts) |
| } |
| |
| <span class="kw">fn </span>end(<span class="kw-2">&</span><span class="self">self</span>) -> SentenceBreaksState { |
| <span class="kw">let </span><span class="kw-2">&</span>SentenceBreaksState(parts) = <span class="self">self</span>; |
| SentenceBreaksState([parts[<span class="number">1</span>], parts[<span class="number">2</span>], parts[<span class="number">3</span>], StatePart::Eot]) |
| } |
| |
| <span class="comment">// Helper function to check if state head matches a single `StatePart` |
| </span><span class="kw">fn </span>match1(<span class="kw-2">&</span><span class="self">self</span>, part: StatePart) -> bool { |
| <span class="kw">let </span><span class="kw-2">&</span>SentenceBreaksState(parts) = <span class="self">self</span>; |
| part == parts[<span class="number">3</span>] |
| } |
| |
| <span class="comment">// Helper function to check if first two `StateParts` in state match |
| // the given two |
| </span><span class="kw">fn </span>match2(<span class="kw-2">&</span><span class="self">self</span>, part1: StatePart, part2: StatePart) -> bool { |
| <span class="kw">let </span><span class="kw-2">&</span>SentenceBreaksState(parts) = <span class="self">self</span>; |
| part1 == parts[<span class="number">2</span>] && part2 == parts[<span class="number">3</span>] |
| } |
| } |
| |
| <span class="comment">// https://unicode.org/reports/tr29/#SB8 |
| // TODO cache this, it is currently quadratic |
| </span><span class="kw">fn </span>match_sb8(state: <span class="kw-2">&</span>SentenceBreaksState, ahead: <span class="kw-2">&</span>str) -> bool { |
| <span class="kw">let </span><span class="kw-2">&</span>SentenceBreaksState(parts) = state; |
| <span class="kw">let </span><span class="kw-2">mut </span>idx = <span class="kw">if </span>parts[<span class="number">3</span>] == StatePart::SpPlus { <span class="number">2 </span>} <span class="kw">else </span>{ <span class="number">3 </span>}; |
| <span class="kw">if </span>parts[idx] == StatePart::ClosePlus { |
| idx -= <span class="number">1 |
| </span>} |
| |
| <span class="kw">if </span>parts[idx] == StatePart::ATerm { |
| <span class="kw">use </span><span class="kw">crate</span>::tables::sentence <span class="kw">as </span>se; |
| |
| <span class="kw">for </span>next_char <span class="kw">in </span>ahead.chars() { |
| <span class="comment">//( ¬(OLetter | Upper | Lower | ParaSep | SATerm) )* Lower |
| </span><span class="kw">match </span>se::sentence_category(next_char).<span class="number">2 </span>{ |
| se::SC_Lower => <span class="kw">return </span><span class="bool-val">true</span>, |
| se::SC_OLetter |
| | se::SC_Upper |
| | se::SC_Sep |
| | se::SC_CR |
| | se::SC_LF |
| | se::SC_STerm |
| | se::SC_ATerm => <span class="kw">return </span><span class="bool-val">false</span>, |
| <span class="kw">_ </span>=> <span class="kw">continue</span>, |
| } |
| } |
| } |
| |
| <span class="bool-val">false |
| </span>} |
| |
| <span class="comment">// https://unicode.org/reports/tr29/#SB8a |
| </span><span class="kw">fn </span>match_sb8a(state: <span class="kw-2">&</span>SentenceBreaksState) -> bool { |
| <span class="comment">// SATerm Close* Sp* |
| </span><span class="kw">let </span><span class="kw-2">&</span>SentenceBreaksState(parts) = state; |
| <span class="kw">let </span><span class="kw-2">mut </span>idx = <span class="kw">if </span>parts[<span class="number">3</span>] == StatePart::SpPlus { <span class="number">2 </span>} <span class="kw">else </span>{ <span class="number">3 </span>}; |
| <span class="kw">if </span>parts[idx] == StatePart::ClosePlus { |
| idx -= <span class="number">1 |
| </span>} |
| parts[idx] == StatePart::STerm || parts[idx] == StatePart::ATerm |
| } |
| |
| <span class="comment">// https://unicode.org/reports/tr29/#SB9 |
| </span><span class="kw">fn </span>match_sb9(state: <span class="kw-2">&</span>SentenceBreaksState) -> bool { |
| <span class="comment">// SATerm Close* |
| </span><span class="kw">let </span><span class="kw-2">&</span>SentenceBreaksState(parts) = state; |
| <span class="kw">let </span>idx = <span class="kw">if </span>parts[<span class="number">3</span>] == StatePart::ClosePlus { |
| <span class="number">2 |
| </span>} <span class="kw">else </span>{ |
| <span class="number">3 |
| </span>}; |
| parts[idx] == StatePart::STerm || parts[idx] == StatePart::ATerm |
| } |
| |
| <span class="comment">// https://unicode.org/reports/tr29/#SB11 |
| </span><span class="kw">fn </span>match_sb11(state: <span class="kw-2">&</span>SentenceBreaksState) -> bool { |
| <span class="comment">// SATerm Close* Sp* ParaSep? |
| </span><span class="kw">let </span><span class="kw-2">&</span>SentenceBreaksState(parts) = state; |
| <span class="kw">let </span><span class="kw-2">mut </span>idx = <span class="kw">match </span>parts[<span class="number">3</span>] { |
| StatePart::Sep | StatePart::CR | StatePart::LF => <span class="number">2</span>, |
| <span class="kw">_ </span>=> <span class="number">3</span>, |
| }; |
| |
| <span class="kw">if </span>parts[idx] == StatePart::SpPlus { |
| idx -= <span class="number">1 |
| </span>} |
| <span class="kw">if </span>parts[idx] == StatePart::ClosePlus { |
| idx -= <span class="number">1 |
| </span>} |
| |
| parts[idx] == StatePart::STerm || parts[idx] == StatePart::ATerm |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>> Iterator <span class="kw">for </span>SentenceBreaks<<span class="lifetime">'a</span>> { |
| <span class="comment">// Returns the index of the character which follows a break |
| </span><span class="kw">type </span>Item = usize; |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>size_hint(<span class="kw-2">&</span><span class="self">self</span>) -> (usize, <span class="prelude-ty">Option</span><usize>) { |
| <span class="kw">let </span>slen = <span class="self">self</span>.string.len(); |
| <span class="comment">// A sentence could be one character |
| </span>(cmp::min(slen, <span class="number">2</span>), <span class="prelude-val">Some</span>(slen + <span class="number">1</span>)) |
| } |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>next(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><usize> { |
| <span class="kw">use </span><span class="kw">crate</span>::tables::sentence <span class="kw">as </span>se; |
| |
| <span class="kw">for </span>next_char <span class="kw">in </span><span class="self">self</span>.string[<span class="self">self</span>.pos..].chars() { |
| <span class="kw">let </span>position_before = <span class="self">self</span>.pos; |
| <span class="kw">let </span>state_before = <span class="self">self</span>.state.clone(); |
| |
| <span class="kw">let </span>next_cat = se::sentence_category(next_char).<span class="number">2</span>; |
| |
| <span class="self">self</span>.pos += next_char.len_utf8(); |
| <span class="self">self</span>.state = <span class="self">self</span>.state.next(next_cat); |
| |
| <span class="kw">match </span>next_cat { |
| <span class="comment">// SB1 https://unicode.org/reports/tr29/#SB1 |
| </span><span class="kw">_ if </span>state_before.match1(StatePart::Sot) => <span class="kw">return </span><span class="prelude-val">Some</span>(position_before), |
| |
| <span class="comment">// SB2 is handled when inner iterator (chars) is finished |
| |
| // SB3 https://unicode.org/reports/tr29/#SB3 |
| </span>SentenceCat::SC_LF <span class="kw">if </span>state_before.match1(StatePart::CR) => <span class="kw">continue</span>, |
| |
| <span class="comment">// SB4 https://unicode.org/reports/tr29/#SB4 |
| </span><span class="kw">_ if </span>state_before.match1(StatePart::Sep) |
| || state_before.match1(StatePart::CR) |
| || state_before.match1(StatePart::LF) => |
| { |
| <span class="kw">return </span><span class="prelude-val">Some</span>(position_before) |
| } |
| |
| <span class="comment">// SB5 https://unicode.org/reports/tr29/#SB5 |
| </span>SentenceCat::SC_Extend | SentenceCat::SC_Format => <span class="self">self</span>.state = state_before, |
| |
| <span class="comment">// SB6 https://unicode.org/reports/tr29/#SB6 |
| </span>SentenceCat::SC_Numeric <span class="kw">if </span>state_before.match1(StatePart::ATerm) => <span class="kw">continue</span>, |
| |
| <span class="comment">// SB7 https://unicode.org/reports/tr29/#SB7 |
| </span>SentenceCat::SC_Upper |
| <span class="kw">if </span>state_before.match2(StatePart::UpperLower, StatePart::ATerm) => |
| { |
| <span class="kw">continue |
| </span>} |
| |
| <span class="comment">// SB8 https://unicode.org/reports/tr29/#SB8 |
| </span><span class="kw">_ if </span>match_sb8(<span class="kw-2">&</span>state_before, <span class="kw-2">&</span><span class="self">self</span>.string[position_before..]) => <span class="kw">continue</span>, |
| |
| <span class="comment">// SB8a https://unicode.org/reports/tr29/#SB8a |
| </span>SentenceCat::SC_SContinue | SentenceCat::SC_STerm | SentenceCat::SC_ATerm |
| <span class="kw">if </span>match_sb8a(<span class="kw-2">&</span>state_before) => |
| { |
| <span class="kw">continue |
| </span>} |
| |
| <span class="comment">// SB9 https://unicode.org/reports/tr29/#SB9 |
| </span>SentenceCat::SC_Close |
| | SentenceCat::SC_Sp |
| | SentenceCat::SC_Sep |
| | SentenceCat::SC_CR |
| | SentenceCat::SC_LF |
| <span class="kw">if </span>match_sb9(<span class="kw-2">&</span>state_before) => |
| { |
| <span class="kw">continue |
| </span>} |
| |
| <span class="comment">// SB10 https://unicode.org/reports/tr29/#SB10 |
| </span>SentenceCat::SC_Sp |
| | SentenceCat::SC_Sep |
| | SentenceCat::SC_CR |
| | SentenceCat::SC_LF |
| <span class="kw">if </span>match_sb8a(<span class="kw-2">&</span>state_before) => |
| { |
| <span class="kw">continue |
| </span>} |
| |
| <span class="comment">// SB11 https://unicode.org/reports/tr29/#SB11 |
| </span><span class="kw">_ if </span>match_sb11(<span class="kw-2">&</span>state_before) => <span class="kw">return </span><span class="prelude-val">Some</span>(position_before), |
| |
| <span class="comment">// SB998 https://unicode.org/reports/tr29/#SB998 |
| </span><span class="kw">_ </span>=> <span class="kw">continue</span>, |
| } |
| } |
| |
| <span class="comment">// SB2 https://unicode.org/reports/tr29/#SB2 |
| </span><span class="kw">if </span><span class="self">self</span>.state.match1(StatePart::Sot) { |
| <span class="prelude-val">None |
| </span>} <span class="kw">else if </span><span class="self">self</span>.state.match1(StatePart::Eot) { |
| <span class="prelude-val">None |
| </span>} <span class="kw">else </span>{ |
| <span class="self">self</span>.state = <span class="self">self</span>.state.end(); |
| <span class="prelude-val">Some</span>(<span class="self">self</span>.pos) |
| } |
| } |
| } |
| |
| <span class="kw">pub fn </span>new_sentence_breaks<<span class="lifetime">'a</span>>(source: <span class="kw-2">&</span><span class="lifetime">'a </span>str) -> SentenceBreaks<<span class="lifetime">'a</span>> { |
| SentenceBreaks { |
| string: source, |
| pos: <span class="number">0</span>, |
| state: INITIAL_STATE, |
| } |
| } |
| } |
| |
| <span class="doccomment">/// An iterator over the substrings of a string which, after splitting the string on |
| /// [sentence boundaries](http://www.unicode.org/reports/tr29/#Sentence_Boundaries), |
| /// contain any characters with the |
| /// [Alphabetic](http://unicode.org/reports/tr44/#Alphabetic) |
| /// property, or with |
| /// [General_Category=Number](http://unicode.org/reports/tr44/#General_Category_Values). |
| /// |
| /// This struct is created by the [`unicode_sentences`] method on the [`UnicodeSegmentation`] |
| /// trait. See its documentation for more. |
| /// |
| /// [`unicode_sentences`]: trait.UnicodeSegmentation.html#tymethod.unicode_sentences |
| /// [`UnicodeSegmentation`]: trait.UnicodeSegmentation.html |
| </span><span class="attribute">#[derive(Clone)] |
| </span><span class="kw">pub struct </span>UnicodeSentences<<span class="lifetime">'a</span>> { |
| inner: Filter<USentenceBounds<<span class="lifetime">'a</span>>, <span class="kw">fn</span>(&&str) -> bool>, |
| } |
| |
| <span class="doccomment">/// External iterator for a string's |
| /// [sentence boundaries](http://www.unicode.org/reports/tr29/#Sentence_Boundaries). |
| /// |
| /// This struct is created by the [`split_sentence_bounds`] method on the [`UnicodeSegmentation`] |
| /// trait. See its documentation for more. |
| /// |
| /// [`split_sentence_bounds`]: trait.UnicodeSegmentation.html#tymethod.split_sentence_bounds |
| /// [`UnicodeSegmentation`]: trait.UnicodeSegmentation.html |
| </span><span class="attribute">#[derive(Clone)] |
| </span><span class="kw">pub struct </span>USentenceBounds<<span class="lifetime">'a</span>> { |
| iter: fwd::SentenceBreaks<<span class="lifetime">'a</span>>, |
| sentence_start: <span class="prelude-ty">Option</span><usize>, |
| } |
| |
| <span class="doccomment">/// External iterator for sentence boundaries and byte offsets. |
| /// |
| /// This struct is created by the [`split_sentence_bound_indices`] method on the |
| /// [`UnicodeSegmentation`] trait. See its documentation for more. |
| /// |
| /// [`split_sentence_bound_indices`]: trait.UnicodeSegmentation.html#tymethod.split_sentence_bound_indices |
| /// [`UnicodeSegmentation`]: trait.UnicodeSegmentation.html |
| </span><span class="attribute">#[derive(Clone)] |
| </span><span class="kw">pub struct </span>USentenceBoundIndices<<span class="lifetime">'a</span>> { |
| start_offset: usize, |
| iter: USentenceBounds<<span class="lifetime">'a</span>>, |
| } |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>new_sentence_bounds<<span class="lifetime">'a</span>>(source: <span class="kw-2">&</span><span class="lifetime">'a </span>str) -> USentenceBounds<<span class="lifetime">'a</span>> { |
| USentenceBounds { |
| iter: fwd::new_sentence_breaks(source), |
| sentence_start: <span class="prelude-val">None</span>, |
| } |
| } |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>new_sentence_bound_indices<<span class="lifetime">'a</span>>(source: <span class="kw-2">&</span><span class="lifetime">'a </span>str) -> USentenceBoundIndices<<span class="lifetime">'a</span>> { |
| USentenceBoundIndices { |
| start_offset: source.as_ptr() <span class="kw">as </span>usize, |
| iter: new_sentence_bounds(source), |
| } |
| } |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>new_unicode_sentences<<span class="lifetime">'b</span>>(s: <span class="kw-2">&</span><span class="lifetime">'b </span>str) -> UnicodeSentences<<span class="lifetime">'b</span>> { |
| <span class="kw">use </span><span class="kw">super</span>::UnicodeSegmentation; |
| <span class="kw">use </span><span class="kw">crate</span>::tables::util::is_alphanumeric; |
| |
| <span class="kw">fn </span>has_alphanumeric(s: &&str) -> bool { |
| s.chars().any(|c| is_alphanumeric(c)) |
| } |
| <span class="kw">let </span>has_alphanumeric: <span class="kw">fn</span>(&&str) -> bool = has_alphanumeric; <span class="comment">// coerce to fn pointer |
| |
| </span>UnicodeSentences { |
| inner: s.split_sentence_bounds().filter(has_alphanumeric), |
| } |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>> Iterator <span class="kw">for </span>UnicodeSentences<<span class="lifetime">'a</span>> { |
| <span class="kw">type </span>Item = <span class="kw-2">&</span><span class="lifetime">'a </span>str; |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>next(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><<span class="kw-2">&</span><span class="lifetime">'a </span>str> { |
| <span class="self">self</span>.inner.next() |
| } |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>> Iterator <span class="kw">for </span>USentenceBounds<<span class="lifetime">'a</span>> { |
| <span class="kw">type </span>Item = <span class="kw-2">&</span><span class="lifetime">'a </span>str; |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>size_hint(<span class="kw-2">&</span><span class="self">self</span>) -> (usize, <span class="prelude-ty">Option</span><usize>) { |
| <span class="kw">let </span>(lower, upper) = <span class="self">self</span>.iter.size_hint(); |
| (cmp::max(<span class="number">0</span>, lower - <span class="number">1</span>), upper.map(|u| cmp::max(<span class="number">0</span>, u - <span class="number">1</span>))) |
| } |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>next(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><<span class="kw-2">&</span><span class="lifetime">'a </span>str> { |
| <span class="kw">if </span><span class="self">self</span>.sentence_start == <span class="prelude-val">None </span>{ |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(start_pos) = <span class="self">self</span>.iter.next() { |
| <span class="self">self</span>.sentence_start = <span class="prelude-val">Some</span>(start_pos) |
| } <span class="kw">else </span>{ |
| <span class="kw">return </span><span class="prelude-val">None</span>; |
| } |
| } |
| |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(break_pos) = <span class="self">self</span>.iter.next() { |
| <span class="kw">let </span>start_pos = <span class="self">self</span>.sentence_start.unwrap(); |
| <span class="kw">let </span>sentence = <span class="kw-2">&</span><span class="self">self</span>.iter.string[start_pos..break_pos]; |
| <span class="self">self</span>.sentence_start = <span class="prelude-val">Some</span>(break_pos); |
| <span class="prelude-val">Some</span>(sentence) |
| } <span class="kw">else </span>{ |
| <span class="prelude-val">None |
| </span>} |
| } |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>> Iterator <span class="kw">for </span>USentenceBoundIndices<<span class="lifetime">'a</span>> { |
| <span class="kw">type </span>Item = (usize, <span class="kw-2">&</span><span class="lifetime">'a </span>str); |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>next(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><(usize, <span class="kw-2">&</span><span class="lifetime">'a </span>str)> { |
| <span class="self">self</span>.iter |
| .next() |
| .map(|s| (s.as_ptr() <span class="kw">as </span>usize - <span class="self">self</span>.start_offset, s)) |
| } |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>size_hint(<span class="kw-2">&</span><span class="self">self</span>) -> (usize, <span class="prelude-ty">Option</span><usize>) { |
| <span class="self">self</span>.iter.size_hint() |
| } |
| } |
| </code></pre></div> |
| </section></div></main><div id="rustdoc-vars" data-root-path="../../" data-current-crate="unicode_segmentation" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |
