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| <span id="800">800</span> |
| <span id="801">801</span> |
| </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><span class="kw">crate</span>::tables::grapheme::GraphemeCat; |
| |
| <span class="doccomment">/// External iterator for grapheme clusters and byte offsets. |
| /// |
| /// This struct is created by the [`grapheme_indices`] method on the [`UnicodeSegmentation`] |
| /// trait. See its documentation for more. |
| /// |
| /// [`grapheme_indices`]: trait.UnicodeSegmentation.html#tymethod.grapheme_indices |
| /// [`UnicodeSegmentation`]: trait.UnicodeSegmentation.html |
| </span><span class="attribute">#[derive(Clone)] |
| </span><span class="kw">pub struct </span>GraphemeIndices<<span class="lifetime">'a</span>> { |
| start_offset: usize, |
| iter: Graphemes<<span class="lifetime">'a</span>>, |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>> GraphemeIndices<<span class="lifetime">'a</span>> { |
| <span class="attribute">#[inline] |
| </span><span class="doccomment">/// View the underlying data (the part yet to be iterated) as a slice of the original string. |
| /// |
| /// ```rust |
| /// # use unicode_segmentation::UnicodeSegmentation; |
| /// let mut iter = "abc".grapheme_indices(true); |
| /// assert_eq!(iter.as_str(), "abc"); |
| /// iter.next(); |
| /// assert_eq!(iter.as_str(), "bc"); |
| /// iter.next(); |
| /// iter.next(); |
| /// assert_eq!(iter.as_str(), ""); |
| /// ``` |
| </span><span class="kw">pub fn </span>as_str(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span><span class="lifetime">'a </span>str { |
| <span class="self">self</span>.iter.as_str() |
| } |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>> Iterator <span class="kw">for </span>GraphemeIndices<<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() |
| } |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>> DoubleEndedIterator <span class="kw">for </span>GraphemeIndices<<span class="lifetime">'a</span>> { |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>next_back(<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_back() |
| .map(|s| (s.as_ptr() <span class="kw">as </span>usize - <span class="self">self</span>.start_offset, s)) |
| } |
| } |
| |
| <span class="doccomment">/// External iterator for a string's |
| /// [grapheme clusters](http://www.unicode.org/reports/tr29/#Grapheme_Cluster_Boundaries). |
| /// |
| /// This struct is created by the [`graphemes`] method on the [`UnicodeSegmentation`] trait. See its |
| /// documentation for more. |
| /// |
| /// [`graphemes`]: trait.UnicodeSegmentation.html#tymethod.graphemes |
| /// [`UnicodeSegmentation`]: trait.UnicodeSegmentation.html |
| </span><span class="attribute">#[derive(Clone, Debug)] |
| </span><span class="kw">pub struct </span>Graphemes<<span class="lifetime">'a</span>> { |
| string: <span class="kw-2">&</span><span class="lifetime">'a </span>str, |
| cursor: GraphemeCursor, |
| cursor_back: GraphemeCursor, |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>> Graphemes<<span class="lifetime">'a</span>> { |
| <span class="attribute">#[inline] |
| </span><span class="doccomment">/// View the underlying data (the part yet to be iterated) as a slice of the original string. |
| /// |
| /// ```rust |
| /// # use unicode_segmentation::UnicodeSegmentation; |
| /// let mut iter = "abc".graphemes(true); |
| /// assert_eq!(iter.as_str(), "abc"); |
| /// iter.next(); |
| /// assert_eq!(iter.as_str(), "bc"); |
| /// iter.next(); |
| /// iter.next(); |
| /// assert_eq!(iter.as_str(), ""); |
| /// ``` |
| </span><span class="kw">pub fn </span>as_str(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span><span class="lifetime">'a </span>str { |
| <span class="kw-2">&</span><span class="self">self</span>.string[<span class="self">self</span>.cursor.cur_cursor()..<span class="self">self</span>.cursor_back.cur_cursor()] |
| } |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>> Iterator <span class="kw">for </span>Graphemes<<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>slen = <span class="self">self</span>.cursor_back.cur_cursor() - <span class="self">self</span>.cursor.cur_cursor(); |
| (cmp::min(slen, <span class="number">1</span>), <span class="prelude-val">Some</span>(slen)) |
| } |
| |
| <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">let </span>start = <span class="self">self</span>.cursor.cur_cursor(); |
| <span class="kw">if </span>start == <span class="self">self</span>.cursor_back.cur_cursor() { |
| <span class="kw">return </span><span class="prelude-val">None</span>; |
| } |
| <span class="kw">let </span>next = <span class="self">self</span>.cursor.next_boundary(<span class="self">self</span>.string, <span class="number">0</span>).unwrap().unwrap(); |
| <span class="prelude-val">Some</span>(<span class="kw-2">&</span><span class="self">self</span>.string[start..next]) |
| } |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>> DoubleEndedIterator <span class="kw">for </span>Graphemes<<span class="lifetime">'a</span>> { |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>next_back(<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">let </span>end = <span class="self">self</span>.cursor_back.cur_cursor(); |
| <span class="kw">if </span>end == <span class="self">self</span>.cursor.cur_cursor() { |
| <span class="kw">return </span><span class="prelude-val">None</span>; |
| } |
| <span class="kw">let </span>prev = <span class="self">self |
| </span>.cursor_back |
| .prev_boundary(<span class="self">self</span>.string, <span class="number">0</span>) |
| .unwrap() |
| .unwrap(); |
| <span class="prelude-val">Some</span>(<span class="kw-2">&</span><span class="self">self</span>.string[prev..end]) |
| } |
| } |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>new_graphemes<<span class="lifetime">'b</span>>(s: <span class="kw-2">&</span><span class="lifetime">'b </span>str, is_extended: bool) -> Graphemes<<span class="lifetime">'b</span>> { |
| <span class="kw">let </span>len = s.len(); |
| Graphemes { |
| string: s, |
| cursor: GraphemeCursor::new(<span class="number">0</span>, len, is_extended), |
| cursor_back: GraphemeCursor::new(len, len, is_extended), |
| } |
| } |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>new_grapheme_indices<<span class="lifetime">'b</span>>(s: <span class="kw-2">&</span><span class="lifetime">'b </span>str, is_extended: bool) -> GraphemeIndices<<span class="lifetime">'b</span>> { |
| GraphemeIndices { |
| start_offset: s.as_ptr() <span class="kw">as </span>usize, |
| iter: new_graphemes(s, is_extended), |
| } |
| } |
| |
| <span class="comment">// maybe unify with PairResult? |
| // An enum describing information about a potential boundary. |
| </span><span class="attribute">#[derive(PartialEq, Eq, Clone, Debug)] |
| </span><span class="kw">enum </span>GraphemeState { |
| <span class="comment">// No information is known. |
| </span>Unknown, |
| <span class="comment">// It is known to not be a boundary. |
| </span>NotBreak, |
| <span class="comment">// It is known to be a boundary. |
| </span>Break, |
| <span class="comment">// The codepoint after is a Regional Indicator Symbol, so a boundary iff |
| // it is preceded by an even number of RIS codepoints. (GB12, GB13) |
| </span>Regional, |
| <span class="comment">// The codepoint after is Extended_Pictographic, |
| // so whether it's a boundary depends on pre-context according to GB11. |
| </span>Emoji, |
| } |
| |
| <span class="doccomment">/// Cursor-based segmenter for grapheme clusters. |
| /// |
| /// This allows working with ropes and other datastructures where the string is not contiguous or |
| /// fully known at initialization time. |
| </span><span class="attribute">#[derive(Clone, Debug)] |
| </span><span class="kw">pub struct </span>GraphemeCursor { |
| <span class="comment">// Current cursor position. |
| </span>offset: usize, |
| <span class="comment">// Total length of the string. |
| </span>len: usize, |
| <span class="comment">// A config flag indicating whether this cursor computes legacy or extended |
| // grapheme cluster boundaries (enables GB9a and GB9b if set). |
| </span>is_extended: bool, |
| <span class="comment">// Information about the potential boundary at `offset` |
| </span>state: GraphemeState, |
| <span class="comment">// Category of codepoint immediately preceding cursor, if known. |
| </span>cat_before: <span class="prelude-ty">Option</span><GraphemeCat>, |
| <span class="comment">// Category of codepoint immediately after cursor, if known. |
| </span>cat_after: <span class="prelude-ty">Option</span><GraphemeCat>, |
| <span class="comment">// If set, at least one more codepoint immediately preceding this offset |
| // is needed to resolve whether there's a boundary at `offset`. |
| </span>pre_context_offset: <span class="prelude-ty">Option</span><usize>, |
| <span class="comment">// The number of RIS codepoints preceding `offset`. If `pre_context_offset` |
| // is set, then counts the number of RIS between that and `offset`, otherwise |
| // is an accurate count relative to the string. |
| </span>ris_count: <span class="prelude-ty">Option</span><usize>, |
| <span class="comment">// Set if a call to `prev_boundary` or `next_boundary` was suspended due |
| // to needing more input. |
| </span>resuming: bool, |
| <span class="comment">// Cached grapheme category and associated scalar value range. |
| </span>grapheme_cat_cache: (u32, u32, GraphemeCat), |
| } |
| |
| <span class="doccomment">/// An error return indicating that not enough content was available in the |
| /// provided chunk to satisfy the query, and that more content must be provided. |
| </span><span class="attribute">#[derive(PartialEq, Eq, Debug)] |
| </span><span class="kw">pub enum </span>GraphemeIncomplete { |
| <span class="doccomment">/// More pre-context is needed. The caller should call `provide_context` |
| /// with a chunk ending at the offset given, then retry the query. This |
| /// will only be returned if the `chunk_start` parameter is nonzero. |
| </span>PreContext(usize), |
| |
| <span class="doccomment">/// When requesting `prev_boundary`, the cursor is moving past the beginning |
| /// of the current chunk, so the chunk before that is requested. This will |
| /// only be returned if the `chunk_start` parameter is nonzero. |
| </span>PrevChunk, |
| |
| <span class="doccomment">/// When requesting `next_boundary`, the cursor is moving past the end of the |
| /// current chunk, so the chunk after that is requested. This will only be |
| /// returned if the chunk ends before the `len` parameter provided on |
| /// creation of the cursor. |
| </span>NextChunk, <span class="comment">// requesting chunk following the one given |
| |
| </span><span class="doccomment">/// An error returned when the chunk given does not contain the cursor position. |
| </span>InvalidOffset, |
| } |
| |
| <span class="comment">// An enum describing the result from lookup of a pair of categories. |
| </span><span class="attribute">#[derive(PartialEq, Eq)] |
| </span><span class="kw">enum </span>PairResult { |
| NotBreak, <span class="comment">// definitely not a break |
| </span>Break, <span class="comment">// definitely a break |
| </span>Extended, <span class="comment">// a break iff not in extended mode |
| </span>Regional, <span class="comment">// a break if preceded by an even number of RIS |
| </span>Emoji, <span class="comment">// a break if preceded by emoji base and (Extend)* |
| </span>} |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>check_pair(before: GraphemeCat, after: GraphemeCat) -> PairResult { |
| <span class="kw">use </span><span class="self">self</span>::PairResult::<span class="kw-2">*</span>; |
| <span class="kw">use </span><span class="kw">crate</span>::tables::grapheme::GraphemeCat::<span class="kw-2">*</span>; |
| <span class="kw">match </span>(before, after) { |
| (GC_CR, GC_LF) => NotBreak, <span class="comment">// GB3 |
| </span>(GC_Control, <span class="kw">_</span>) => Break, <span class="comment">// GB4 |
| </span>(GC_CR, <span class="kw">_</span>) => Break, <span class="comment">// GB4 |
| </span>(GC_LF, <span class="kw">_</span>) => Break, <span class="comment">// GB4 |
| </span>(<span class="kw">_</span>, GC_Control) => Break, <span class="comment">// GB5 |
| </span>(<span class="kw">_</span>, GC_CR) => Break, <span class="comment">// GB5 |
| </span>(<span class="kw">_</span>, GC_LF) => Break, <span class="comment">// GB5 |
| </span>(GC_L, GC_L) => NotBreak, <span class="comment">// GB6 |
| </span>(GC_L, GC_V) => NotBreak, <span class="comment">// GB6 |
| </span>(GC_L, GC_LV) => NotBreak, <span class="comment">// GB6 |
| </span>(GC_L, GC_LVT) => NotBreak, <span class="comment">// GB6 |
| </span>(GC_LV, GC_V) => NotBreak, <span class="comment">// GB7 |
| </span>(GC_LV, GC_T) => NotBreak, <span class="comment">// GB7 |
| </span>(GC_V, GC_V) => NotBreak, <span class="comment">// GB7 |
| </span>(GC_V, GC_T) => NotBreak, <span class="comment">// GB7 |
| </span>(GC_LVT, GC_T) => NotBreak, <span class="comment">// GB8 |
| </span>(GC_T, GC_T) => NotBreak, <span class="comment">// GB8 |
| </span>(<span class="kw">_</span>, GC_Extend) => NotBreak, <span class="comment">// GB9 |
| </span>(<span class="kw">_</span>, GC_ZWJ) => NotBreak, <span class="comment">// GB9 |
| </span>(<span class="kw">_</span>, GC_SpacingMark) => Extended, <span class="comment">// GB9a |
| </span>(GC_Prepend, <span class="kw">_</span>) => Extended, <span class="comment">// GB9b |
| </span>(GC_ZWJ, GC_Extended_Pictographic) => Emoji, <span class="comment">// GB11 |
| </span>(GC_Regional_Indicator, GC_Regional_Indicator) => Regional, <span class="comment">// GB12, GB13 |
| </span>(<span class="kw">_</span>, <span class="kw">_</span>) => Break, <span class="comment">// GB999 |
| </span>} |
| } |
| |
| <span class="kw">impl </span>GraphemeCursor { |
| <span class="doccomment">/// Create a new cursor. The string and initial offset are given at creation |
| /// time, but the contents of the string are not. The `is_extended` parameter |
| /// controls whether extended grapheme clusters are selected. |
| /// |
| /// The `offset` parameter must be on a codepoint boundary. |
| /// |
| /// ```rust |
| /// # use unicode_segmentation::GraphemeCursor; |
| /// let s = "हिन्दी"; |
| /// let mut legacy = GraphemeCursor::new(0, s.len(), false); |
| /// assert_eq!(legacy.next_boundary(s, 0), Ok(Some("ह".len()))); |
| /// let mut extended = GraphemeCursor::new(0, s.len(), true); |
| /// assert_eq!(extended.next_boundary(s, 0), Ok(Some("हि".len()))); |
| /// ``` |
| </span><span class="kw">pub fn </span>new(offset: usize, len: usize, is_extended: bool) -> GraphemeCursor { |
| <span class="kw">let </span>state = <span class="kw">if </span>offset == <span class="number">0 </span>|| offset == len { |
| GraphemeState::Break |
| } <span class="kw">else </span>{ |
| GraphemeState::Unknown |
| }; |
| GraphemeCursor { |
| offset: offset, |
| len: len, |
| state: state, |
| is_extended: is_extended, |
| cat_before: <span class="prelude-val">None</span>, |
| cat_after: <span class="prelude-val">None</span>, |
| pre_context_offset: <span class="prelude-val">None</span>, |
| ris_count: <span class="prelude-val">None</span>, |
| resuming: <span class="bool-val">false</span>, |
| grapheme_cat_cache: (<span class="number">0</span>, <span class="number">0</span>, GraphemeCat::GC_Control), |
| } |
| } |
| |
| <span class="kw">fn </span>grapheme_category(<span class="kw-2">&mut </span><span class="self">self</span>, ch: char) -> GraphemeCat { |
| <span class="kw">use </span><span class="kw">crate</span>::tables::grapheme <span class="kw">as </span>gr; |
| <span class="kw">use </span><span class="kw">crate</span>::tables::grapheme::GraphemeCat::<span class="kw-2">*</span>; |
| |
| <span class="kw">if </span>ch <= <span class="string">'\u{7e}' </span>{ |
| <span class="comment">// Special-case optimization for ascii, except U+007F. This |
| // improves performance even for many primarily non-ascii texts, |
| // due to use of punctuation and white space characters from the |
| // ascii range. |
| </span><span class="kw">if </span>ch >= <span class="string">'\u{20}' </span>{ |
| GC_Any |
| } <span class="kw">else if </span>ch == <span class="string">'\n' </span>{ |
| GC_LF |
| } <span class="kw">else if </span>ch == <span class="string">'\r' </span>{ |
| GC_CR |
| } <span class="kw">else </span>{ |
| GC_Control |
| } |
| } <span class="kw">else </span>{ |
| <span class="comment">// If this char isn't within the cached range, update the cache to the |
| // range that includes it. |
| </span><span class="kw">if </span>(ch <span class="kw">as </span>u32) < <span class="self">self</span>.grapheme_cat_cache.<span class="number">0 </span>|| (ch <span class="kw">as </span>u32) > <span class="self">self</span>.grapheme_cat_cache.<span class="number">1 </span>{ |
| <span class="self">self</span>.grapheme_cat_cache = gr::grapheme_category(ch); |
| } |
| <span class="self">self</span>.grapheme_cat_cache.<span class="number">2 |
| </span>} |
| } |
| |
| <span class="comment">// Not sure I'm gonna keep this, the advantage over new() seems thin. |
| |
| </span><span class="doccomment">/// Set the cursor to a new location in the same string. |
| /// |
| /// ```rust |
| /// # use unicode_segmentation::GraphemeCursor; |
| /// let s = "abcd"; |
| /// let mut cursor = GraphemeCursor::new(0, s.len(), false); |
| /// assert_eq!(cursor.cur_cursor(), 0); |
| /// cursor.set_cursor(2); |
| /// assert_eq!(cursor.cur_cursor(), 2); |
| /// ``` |
| </span><span class="kw">pub fn </span>set_cursor(<span class="kw-2">&mut </span><span class="self">self</span>, offset: usize) { |
| <span class="kw">if </span>offset != <span class="self">self</span>.offset { |
| <span class="self">self</span>.offset = offset; |
| <span class="self">self</span>.state = <span class="kw">if </span>offset == <span class="number">0 </span>|| offset == <span class="self">self</span>.len { |
| GraphemeState::Break |
| } <span class="kw">else </span>{ |
| GraphemeState::Unknown |
| }; |
| <span class="comment">// reset state derived from text around cursor |
| </span><span class="self">self</span>.cat_before = <span class="prelude-val">None</span>; |
| <span class="self">self</span>.cat_after = <span class="prelude-val">None</span>; |
| <span class="self">self</span>.ris_count = <span class="prelude-val">None</span>; |
| } |
| } |
| |
| <span class="attribute">#[inline] |
| </span><span class="doccomment">/// The current offset of the cursor. Equal to the last value provided to |
| /// `new()` or `set_cursor()`, or returned from `next_boundary()` or |
| /// `prev_boundary()`. |
| /// |
| /// ```rust |
| /// # use unicode_segmentation::GraphemeCursor; |
| /// // Two flags (🇷🇸🇮🇴), each flag is two RIS codepoints, each RIS is 4 bytes. |
| /// let flags = "\u{1F1F7}\u{1F1F8}\u{1F1EE}\u{1F1F4}"; |
| /// let mut cursor = GraphemeCursor::new(4, flags.len(), false); |
| /// assert_eq!(cursor.cur_cursor(), 4); |
| /// assert_eq!(cursor.next_boundary(flags, 0), Ok(Some(8))); |
| /// assert_eq!(cursor.cur_cursor(), 8); |
| /// ``` |
| </span><span class="kw">pub fn </span>cur_cursor(<span class="kw-2">&</span><span class="self">self</span>) -> usize { |
| <span class="self">self</span>.offset |
| } |
| |
| <span class="doccomment">/// Provide additional pre-context when it is needed to decide a boundary. |
| /// The end of the chunk must coincide with the value given in the |
| /// `GraphemeIncomplete::PreContext` request. |
| /// |
| /// ```rust |
| /// # use unicode_segmentation::{GraphemeCursor, GraphemeIncomplete}; |
| /// let flags = "\u{1F1F7}\u{1F1F8}\u{1F1EE}\u{1F1F4}"; |
| /// let mut cursor = GraphemeCursor::new(8, flags.len(), false); |
| /// // Not enough pre-context to decide if there's a boundary between the two flags. |
| /// assert_eq!(cursor.is_boundary(&flags[8..], 8), Err(GraphemeIncomplete::PreContext(8))); |
| /// // Provide one more Regional Indicator Symbol of pre-context |
| /// cursor.provide_context(&flags[4..8], 4); |
| /// // Still not enough context to decide. |
| /// assert_eq!(cursor.is_boundary(&flags[8..], 8), Err(GraphemeIncomplete::PreContext(4))); |
| /// // Provide additional requested context. |
| /// cursor.provide_context(&flags[0..4], 0); |
| /// // That's enough to decide (it always is when context goes to the start of the string) |
| /// assert_eq!(cursor.is_boundary(&flags[8..], 8), Ok(true)); |
| /// ``` |
| </span><span class="kw">pub fn </span>provide_context(<span class="kw-2">&mut </span><span class="self">self</span>, chunk: <span class="kw-2">&</span>str, chunk_start: usize) { |
| <span class="kw">use </span><span class="kw">crate</span>::tables::grapheme <span class="kw">as </span>gr; |
| <span class="macro">assert!</span>(chunk_start + chunk.len() == <span class="self">self</span>.pre_context_offset.unwrap()); |
| <span class="self">self</span>.pre_context_offset = <span class="prelude-val">None</span>; |
| <span class="kw">if </span><span class="self">self</span>.is_extended && chunk_start + chunk.len() == <span class="self">self</span>.offset { |
| <span class="kw">let </span>ch = chunk.chars().rev().next().unwrap(); |
| <span class="kw">if </span><span class="self">self</span>.grapheme_category(ch) == gr::GC_Prepend { |
| <span class="self">self</span>.decide(<span class="bool-val">false</span>); <span class="comment">// GB9b |
| </span><span class="kw">return</span>; |
| } |
| } |
| <span class="kw">match </span><span class="self">self</span>.state { |
| GraphemeState::Regional => <span class="self">self</span>.handle_regional(chunk, chunk_start), |
| GraphemeState::Emoji => <span class="self">self</span>.handle_emoji(chunk, chunk_start), |
| <span class="kw">_ </span>=> { |
| <span class="kw">if </span><span class="self">self</span>.cat_before.is_none() && <span class="self">self</span>.offset == chunk.len() + chunk_start { |
| <span class="kw">let </span>ch = chunk.chars().rev().next().unwrap(); |
| <span class="self">self</span>.cat_before = <span class="prelude-val">Some</span>(<span class="self">self</span>.grapheme_category(ch)); |
| } |
| } |
| } |
| } |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>decide(<span class="kw-2">&mut </span><span class="self">self</span>, is_break: bool) { |
| <span class="self">self</span>.state = <span class="kw">if </span>is_break { |
| GraphemeState::Break |
| } <span class="kw">else </span>{ |
| GraphemeState::NotBreak |
| }; |
| } |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>decision(<span class="kw-2">&mut </span><span class="self">self</span>, is_break: bool) -> <span class="prelude-ty">Result</span><bool, GraphemeIncomplete> { |
| <span class="self">self</span>.decide(is_break); |
| <span class="prelude-val">Ok</span>(is_break) |
| } |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>is_boundary_result(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Result</span><bool, GraphemeIncomplete> { |
| <span class="kw">if </span><span class="self">self</span>.state == GraphemeState::Break { |
| <span class="prelude-val">Ok</span>(<span class="bool-val">true</span>) |
| } <span class="kw">else if </span><span class="self">self</span>.state == GraphemeState::NotBreak { |
| <span class="prelude-val">Ok</span>(<span class="bool-val">false</span>) |
| } <span class="kw">else if let </span><span class="prelude-val">Some</span>(pre_context_offset) = <span class="self">self</span>.pre_context_offset { |
| <span class="prelude-val">Err</span>(GraphemeIncomplete::PreContext(pre_context_offset)) |
| } <span class="kw">else </span>{ |
| <span class="macro">unreachable!</span>(<span class="string">"inconsistent state"</span>); |
| } |
| } |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>handle_regional(<span class="kw-2">&mut </span><span class="self">self</span>, chunk: <span class="kw-2">&</span>str, chunk_start: usize) { |
| <span class="kw">use </span><span class="kw">crate</span>::tables::grapheme <span class="kw">as </span>gr; |
| <span class="kw">let </span><span class="kw-2">mut </span>ris_count = <span class="self">self</span>.ris_count.unwrap_or(<span class="number">0</span>); |
| <span class="kw">for </span>ch <span class="kw">in </span>chunk.chars().rev() { |
| <span class="kw">if </span><span class="self">self</span>.grapheme_category(ch) != gr::GC_Regional_Indicator { |
| <span class="self">self</span>.ris_count = <span class="prelude-val">Some</span>(ris_count); |
| <span class="self">self</span>.decide((ris_count % <span class="number">2</span>) == <span class="number">0</span>); |
| <span class="kw">return</span>; |
| } |
| ris_count += <span class="number">1</span>; |
| } |
| <span class="self">self</span>.ris_count = <span class="prelude-val">Some</span>(ris_count); |
| <span class="kw">if </span>chunk_start == <span class="number">0 </span>{ |
| <span class="self">self</span>.decide((ris_count % <span class="number">2</span>) == <span class="number">0</span>); |
| <span class="kw">return</span>; |
| } |
| <span class="self">self</span>.pre_context_offset = <span class="prelude-val">Some</span>(chunk_start); |
| <span class="self">self</span>.state = GraphemeState::Regional; |
| } |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>handle_emoji(<span class="kw-2">&mut </span><span class="self">self</span>, chunk: <span class="kw-2">&</span>str, chunk_start: usize) { |
| <span class="kw">use </span><span class="kw">crate</span>::tables::grapheme <span class="kw">as </span>gr; |
| <span class="kw">let </span><span class="kw-2">mut </span>iter = chunk.chars().rev(); |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(ch) = iter.next() { |
| <span class="kw">if </span><span class="self">self</span>.grapheme_category(ch) != gr::GC_ZWJ { |
| <span class="self">self</span>.decide(<span class="bool-val">true</span>); |
| <span class="kw">return</span>; |
| } |
| } |
| <span class="kw">for </span>ch <span class="kw">in </span>iter { |
| <span class="kw">match </span><span class="self">self</span>.grapheme_category(ch) { |
| gr::GC_Extend => (), |
| gr::GC_Extended_Pictographic => { |
| <span class="self">self</span>.decide(<span class="bool-val">false</span>); |
| <span class="kw">return</span>; |
| } |
| <span class="kw">_ </span>=> { |
| <span class="self">self</span>.decide(<span class="bool-val">true</span>); |
| <span class="kw">return</span>; |
| } |
| } |
| } |
| <span class="kw">if </span>chunk_start == <span class="number">0 </span>{ |
| <span class="self">self</span>.decide(<span class="bool-val">true</span>); |
| <span class="kw">return</span>; |
| } |
| <span class="self">self</span>.pre_context_offset = <span class="prelude-val">Some</span>(chunk_start); |
| <span class="self">self</span>.state = GraphemeState::Emoji; |
| } |
| |
| <span class="attribute">#[inline] |
| </span><span class="doccomment">/// Determine whether the current cursor location is a grapheme cluster boundary. |
| /// Only a part of the string need be supplied. If `chunk_start` is nonzero or |
| /// the length of `chunk` is not equal to `len` on creation, then this method |
| /// may return `GraphemeIncomplete::PreContext`. The caller should then |
| /// call `provide_context` with the requested chunk, then retry calling this |
| /// method. |
| /// |
| /// For partial chunks, if the cursor is not at the beginning or end of the |
| /// string, the chunk should contain at least the codepoint following the cursor. |
| /// If the string is nonempty, the chunk must be nonempty. |
| /// |
| /// All calls should have consistent chunk contents (ie, if a chunk provides |
| /// content for a given slice, all further chunks covering that slice must have |
| /// the same content for it). |
| /// |
| /// ```rust |
| /// # use unicode_segmentation::GraphemeCursor; |
| /// let flags = "\u{1F1F7}\u{1F1F8}\u{1F1EE}\u{1F1F4}"; |
| /// let mut cursor = GraphemeCursor::new(8, flags.len(), false); |
| /// assert_eq!(cursor.is_boundary(flags, 0), Ok(true)); |
| /// cursor.set_cursor(12); |
| /// assert_eq!(cursor.is_boundary(flags, 0), Ok(false)); |
| /// ``` |
| </span><span class="kw">pub fn </span>is_boundary( |
| <span class="kw-2">&mut </span><span class="self">self</span>, |
| chunk: <span class="kw-2">&</span>str, |
| chunk_start: usize, |
| ) -> <span class="prelude-ty">Result</span><bool, GraphemeIncomplete> { |
| <span class="kw">use </span><span class="kw">crate</span>::tables::grapheme <span class="kw">as </span>gr; |
| <span class="kw">if </span><span class="self">self</span>.state == GraphemeState::Break { |
| <span class="kw">return </span><span class="prelude-val">Ok</span>(<span class="bool-val">true</span>); |
| } |
| <span class="kw">if </span><span class="self">self</span>.state == GraphemeState::NotBreak { |
| <span class="kw">return </span><span class="prelude-val">Ok</span>(<span class="bool-val">false</span>); |
| } |
| <span class="kw">if </span><span class="self">self</span>.offset < chunk_start || <span class="self">self</span>.offset >= chunk_start + chunk.len() { |
| <span class="kw">if </span><span class="self">self</span>.offset > chunk_start + chunk.len() || <span class="self">self</span>.cat_after.is_none() { |
| <span class="kw">return </span><span class="prelude-val">Err</span>(GraphemeIncomplete::InvalidOffset); |
| } |
| } |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(pre_context_offset) = <span class="self">self</span>.pre_context_offset { |
| <span class="kw">return </span><span class="prelude-val">Err</span>(GraphemeIncomplete::PreContext(pre_context_offset)); |
| } |
| <span class="kw">let </span>offset_in_chunk = <span class="self">self</span>.offset - chunk_start; |
| <span class="kw">if </span><span class="self">self</span>.cat_after.is_none() { |
| <span class="kw">let </span>ch = chunk[offset_in_chunk..].chars().next().unwrap(); |
| <span class="self">self</span>.cat_after = <span class="prelude-val">Some</span>(<span class="self">self</span>.grapheme_category(ch)); |
| } |
| <span class="kw">if </span><span class="self">self</span>.offset == chunk_start { |
| <span class="kw">let </span><span class="kw-2">mut </span>need_pre_context = <span class="bool-val">true</span>; |
| <span class="kw">match </span><span class="self">self</span>.cat_after.unwrap() { |
| gr::GC_Regional_Indicator => <span class="self">self</span>.state = GraphemeState::Regional, |
| gr::GC_Extended_Pictographic => <span class="self">self</span>.state = GraphemeState::Emoji, |
| <span class="kw">_ </span>=> need_pre_context = <span class="self">self</span>.cat_before.is_none(), |
| } |
| <span class="kw">if </span>need_pre_context { |
| <span class="self">self</span>.pre_context_offset = <span class="prelude-val">Some</span>(chunk_start); |
| <span class="kw">return </span><span class="prelude-val">Err</span>(GraphemeIncomplete::PreContext(chunk_start)); |
| } |
| } |
| <span class="kw">if </span><span class="self">self</span>.cat_before.is_none() { |
| <span class="kw">let </span>ch = chunk[..offset_in_chunk].chars().rev().next().unwrap(); |
| <span class="self">self</span>.cat_before = <span class="prelude-val">Some</span>(<span class="self">self</span>.grapheme_category(ch)); |
| } |
| <span class="kw">match </span>check_pair(<span class="self">self</span>.cat_before.unwrap(), <span class="self">self</span>.cat_after.unwrap()) { |
| PairResult::NotBreak => <span class="kw">return </span><span class="self">self</span>.decision(<span class="bool-val">false</span>), |
| PairResult::Break => <span class="kw">return </span><span class="self">self</span>.decision(<span class="bool-val">true</span>), |
| PairResult::Extended => { |
| <span class="kw">let </span>is_extended = <span class="self">self</span>.is_extended; |
| <span class="kw">return </span><span class="self">self</span>.decision(!is_extended); |
| } |
| PairResult::Regional => { |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(ris_count) = <span class="self">self</span>.ris_count { |
| <span class="kw">return </span><span class="self">self</span>.decision((ris_count % <span class="number">2</span>) == <span class="number">0</span>); |
| } |
| <span class="self">self</span>.handle_regional(<span class="kw-2">&</span>chunk[..offset_in_chunk], chunk_start); |
| <span class="self">self</span>.is_boundary_result() |
| } |
| PairResult::Emoji => { |
| <span class="self">self</span>.handle_emoji(<span class="kw-2">&</span>chunk[..offset_in_chunk], chunk_start); |
| <span class="self">self</span>.is_boundary_result() |
| } |
| } |
| } |
| |
| <span class="attribute">#[inline] |
| </span><span class="doccomment">/// Find the next boundary after the current cursor position. Only a part of |
| /// the string need be supplied. If the chunk is incomplete, then this |
| /// method might return `GraphemeIncomplete::PreContext` or |
| /// `GraphemeIncomplete::NextChunk`. In the former case, the caller should |
| /// call `provide_context` with the requested chunk, then retry. In the |
| /// latter case, the caller should provide the chunk following the one |
| /// given, then retry. |
| /// |
| /// See `is_boundary` for expectations on the provided chunk. |
| /// |
| /// ```rust |
| /// # use unicode_segmentation::GraphemeCursor; |
| /// let flags = "\u{1F1F7}\u{1F1F8}\u{1F1EE}\u{1F1F4}"; |
| /// let mut cursor = GraphemeCursor::new(4, flags.len(), false); |
| /// assert_eq!(cursor.next_boundary(flags, 0), Ok(Some(8))); |
| /// assert_eq!(cursor.next_boundary(flags, 0), Ok(Some(16))); |
| /// assert_eq!(cursor.next_boundary(flags, 0), Ok(None)); |
| /// ``` |
| /// |
| /// And an example that uses partial strings: |
| /// |
| /// ```rust |
| /// # use unicode_segmentation::{GraphemeCursor, GraphemeIncomplete}; |
| /// let s = "abcd"; |
| /// let mut cursor = GraphemeCursor::new(0, s.len(), false); |
| /// assert_eq!(cursor.next_boundary(&s[..2], 0), Ok(Some(1))); |
| /// assert_eq!(cursor.next_boundary(&s[..2], 0), Err(GraphemeIncomplete::NextChunk)); |
| /// assert_eq!(cursor.next_boundary(&s[2..4], 2), Ok(Some(2))); |
| /// assert_eq!(cursor.next_boundary(&s[2..4], 2), Ok(Some(3))); |
| /// assert_eq!(cursor.next_boundary(&s[2..4], 2), Ok(Some(4))); |
| /// assert_eq!(cursor.next_boundary(&s[2..4], 2), Ok(None)); |
| /// ``` |
| </span><span class="kw">pub fn </span>next_boundary( |
| <span class="kw-2">&mut </span><span class="self">self</span>, |
| chunk: <span class="kw-2">&</span>str, |
| chunk_start: usize, |
| ) -> <span class="prelude-ty">Result</span><<span class="prelude-ty">Option</span><usize>, GraphemeIncomplete> { |
| <span class="kw">if </span><span class="self">self</span>.offset == <span class="self">self</span>.len { |
| <span class="kw">return </span><span class="prelude-val">Ok</span>(<span class="prelude-val">None</span>); |
| } |
| <span class="kw">let </span><span class="kw-2">mut </span>iter = chunk[<span class="self">self</span>.offset - chunk_start..].chars(); |
| <span class="kw">let </span><span class="kw-2">mut </span>ch = iter.next().unwrap(); |
| <span class="kw">loop </span>{ |
| <span class="kw">if </span><span class="self">self</span>.resuming { |
| <span class="kw">if </span><span class="self">self</span>.cat_after.is_none() { |
| <span class="self">self</span>.cat_after = <span class="prelude-val">Some</span>(<span class="self">self</span>.grapheme_category(ch)); |
| } |
| } <span class="kw">else </span>{ |
| <span class="self">self</span>.offset += ch.len_utf8(); |
| <span class="self">self</span>.state = GraphemeState::Unknown; |
| <span class="self">self</span>.cat_before = <span class="self">self</span>.cat_after.take(); |
| <span class="kw">if </span><span class="self">self</span>.cat_before.is_none() { |
| <span class="self">self</span>.cat_before = <span class="prelude-val">Some</span>(<span class="self">self</span>.grapheme_category(ch)); |
| } |
| <span class="kw">if </span><span class="self">self</span>.cat_before.unwrap() == GraphemeCat::GC_Regional_Indicator { |
| <span class="self">self</span>.ris_count = <span class="self">self</span>.ris_count.map(|c| c + <span class="number">1</span>); |
| } <span class="kw">else </span>{ |
| <span class="self">self</span>.ris_count = <span class="prelude-val">Some</span>(<span class="number">0</span>); |
| } |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(next_ch) = iter.next() { |
| ch = next_ch; |
| <span class="self">self</span>.cat_after = <span class="prelude-val">Some</span>(<span class="self">self</span>.grapheme_category(ch)); |
| } <span class="kw">else if </span><span class="self">self</span>.offset == <span class="self">self</span>.len { |
| <span class="self">self</span>.decide(<span class="bool-val">true</span>); |
| } <span class="kw">else </span>{ |
| <span class="self">self</span>.resuming = <span class="bool-val">true</span>; |
| <span class="kw">return </span><span class="prelude-val">Err</span>(GraphemeIncomplete::NextChunk); |
| } |
| } |
| <span class="self">self</span>.resuming = <span class="bool-val">true</span>; |
| <span class="kw">if </span><span class="self">self</span>.is_boundary(chunk, chunk_start)<span class="question-mark">? </span>{ |
| <span class="self">self</span>.resuming = <span class="bool-val">false</span>; |
| <span class="kw">return </span><span class="prelude-val">Ok</span>(<span class="prelude-val">Some</span>(<span class="self">self</span>.offset)); |
| } |
| <span class="self">self</span>.resuming = <span class="bool-val">false</span>; |
| } |
| } |
| |
| <span class="doccomment">/// Find the previous boundary after the current cursor position. Only a part |
| /// of the string need be supplied. If the chunk is incomplete, then this |
| /// method might return `GraphemeIncomplete::PreContext` or |
| /// `GraphemeIncomplete::PrevChunk`. In the former case, the caller should |
| /// call `provide_context` with the requested chunk, then retry. In the |
| /// latter case, the caller should provide the chunk preceding the one |
| /// given, then retry. |
| /// |
| /// See `is_boundary` for expectations on the provided chunk. |
| /// |
| /// ```rust |
| /// # use unicode_segmentation::GraphemeCursor; |
| /// let flags = "\u{1F1F7}\u{1F1F8}\u{1F1EE}\u{1F1F4}"; |
| /// let mut cursor = GraphemeCursor::new(12, flags.len(), false); |
| /// assert_eq!(cursor.prev_boundary(flags, 0), Ok(Some(8))); |
| /// assert_eq!(cursor.prev_boundary(flags, 0), Ok(Some(0))); |
| /// assert_eq!(cursor.prev_boundary(flags, 0), Ok(None)); |
| /// ``` |
| /// |
| /// And an example that uses partial strings (note the exact return is not |
| /// guaranteed, and may be `PrevChunk` or `PreContext` arbitrarily): |
| /// |
| /// ```rust |
| /// # use unicode_segmentation::{GraphemeCursor, GraphemeIncomplete}; |
| /// let s = "abcd"; |
| /// let mut cursor = GraphemeCursor::new(4, s.len(), false); |
| /// assert_eq!(cursor.prev_boundary(&s[2..4], 2), Ok(Some(3))); |
| /// assert_eq!(cursor.prev_boundary(&s[2..4], 2), Err(GraphemeIncomplete::PrevChunk)); |
| /// assert_eq!(cursor.prev_boundary(&s[0..2], 0), Ok(Some(2))); |
| /// assert_eq!(cursor.prev_boundary(&s[0..2], 0), Ok(Some(1))); |
| /// assert_eq!(cursor.prev_boundary(&s[0..2], 0), Ok(Some(0))); |
| /// assert_eq!(cursor.prev_boundary(&s[0..2], 0), Ok(None)); |
| /// ``` |
| </span><span class="kw">pub fn </span>prev_boundary( |
| <span class="kw-2">&mut </span><span class="self">self</span>, |
| chunk: <span class="kw-2">&</span>str, |
| chunk_start: usize, |
| ) -> <span class="prelude-ty">Result</span><<span class="prelude-ty">Option</span><usize>, GraphemeIncomplete> { |
| <span class="kw">if </span><span class="self">self</span>.offset == <span class="number">0 </span>{ |
| <span class="kw">return </span><span class="prelude-val">Ok</span>(<span class="prelude-val">None</span>); |
| } |
| <span class="kw">if </span><span class="self">self</span>.offset == chunk_start { |
| <span class="kw">return </span><span class="prelude-val">Err</span>(GraphemeIncomplete::PrevChunk); |
| } |
| <span class="kw">let </span><span class="kw-2">mut </span>iter = chunk[..<span class="self">self</span>.offset - chunk_start].chars().rev(); |
| <span class="kw">let </span><span class="kw-2">mut </span>ch = iter.next().unwrap(); |
| <span class="kw">loop </span>{ |
| <span class="kw">if </span><span class="self">self</span>.offset == chunk_start { |
| <span class="self">self</span>.resuming = <span class="bool-val">true</span>; |
| <span class="kw">return </span><span class="prelude-val">Err</span>(GraphemeIncomplete::PrevChunk); |
| } |
| <span class="kw">if </span><span class="self">self</span>.resuming { |
| <span class="self">self</span>.cat_before = <span class="prelude-val">Some</span>(<span class="self">self</span>.grapheme_category(ch)); |
| } <span class="kw">else </span>{ |
| <span class="self">self</span>.offset -= ch.len_utf8(); |
| <span class="self">self</span>.cat_after = <span class="self">self</span>.cat_before.take(); |
| <span class="self">self</span>.state = GraphemeState::Unknown; |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(ris_count) = <span class="self">self</span>.ris_count { |
| <span class="self">self</span>.ris_count = <span class="kw">if </span>ris_count > <span class="number">0 </span>{ |
| <span class="prelude-val">Some</span>(ris_count - <span class="number">1</span>) |
| } <span class="kw">else </span>{ |
| <span class="prelude-val">None |
| </span>}; |
| } |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(prev_ch) = iter.next() { |
| ch = prev_ch; |
| <span class="self">self</span>.cat_before = <span class="prelude-val">Some</span>(<span class="self">self</span>.grapheme_category(ch)); |
| } <span class="kw">else if </span><span class="self">self</span>.offset == <span class="number">0 </span>{ |
| <span class="self">self</span>.decide(<span class="bool-val">true</span>); |
| } <span class="kw">else </span>{ |
| <span class="self">self</span>.resuming = <span class="bool-val">true</span>; |
| <span class="self">self</span>.cat_after = <span class="prelude-val">Some</span>(<span class="self">self</span>.grapheme_category(ch)); |
| <span class="kw">return </span><span class="prelude-val">Err</span>(GraphemeIncomplete::PrevChunk); |
| } |
| } |
| <span class="self">self</span>.resuming = <span class="bool-val">true</span>; |
| <span class="kw">if </span><span class="self">self</span>.is_boundary(chunk, chunk_start)<span class="question-mark">? </span>{ |
| <span class="self">self</span>.resuming = <span class="bool-val">false</span>; |
| <span class="kw">return </span><span class="prelude-val">Ok</span>(<span class="prelude-val">Some</span>(<span class="self">self</span>.offset)); |
| } |
| <span class="self">self</span>.resuming = <span class="bool-val">false</span>; |
| } |
| } |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>test_grapheme_cursor_ris_precontext() { |
| <span class="kw">let </span>s = <span class="string">"\u{1f1fa}\u{1f1f8}\u{1f1fa}\u{1f1f8}\u{1f1fa}\u{1f1f8}"</span>; |
| <span class="kw">let </span><span class="kw-2">mut </span>c = GraphemeCursor::new(<span class="number">8</span>, s.len(), <span class="bool-val">true</span>); |
| <span class="macro">assert_eq!</span>( |
| c.is_boundary(<span class="kw-2">&</span>s[<span class="number">4</span>..], <span class="number">4</span>), |
| <span class="prelude-val">Err</span>(GraphemeIncomplete::PreContext(<span class="number">4</span>)) |
| ); |
| c.provide_context(<span class="kw-2">&</span>s[..<span class="number">4</span>], <span class="number">0</span>); |
| <span class="macro">assert_eq!</span>(c.is_boundary(<span class="kw-2">&</span>s[<span class="number">4</span>..], <span class="number">4</span>), <span class="prelude-val">Ok</span>(<span class="bool-val">true</span>)); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>test_grapheme_cursor_chunk_start_require_precontext() { |
| <span class="kw">let </span>s = <span class="string">"\r\n"</span>; |
| <span class="kw">let </span><span class="kw-2">mut </span>c = GraphemeCursor::new(<span class="number">1</span>, s.len(), <span class="bool-val">true</span>); |
| <span class="macro">assert_eq!</span>( |
| c.is_boundary(<span class="kw-2">&</span>s[<span class="number">1</span>..], <span class="number">1</span>), |
| <span class="prelude-val">Err</span>(GraphemeIncomplete::PreContext(<span class="number">1</span>)) |
| ); |
| c.provide_context(<span class="kw-2">&</span>s[..<span class="number">1</span>], <span class="number">0</span>); |
| <span class="macro">assert_eq!</span>(c.is_boundary(<span class="kw-2">&</span>s[<span class="number">1</span>..], <span class="number">1</span>), <span class="prelude-val">Ok</span>(<span class="bool-val">false</span>)); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>test_grapheme_cursor_prev_boundary() { |
| <span class="kw">let </span>s = <span class="string">"abcd"</span>; |
| <span class="kw">let </span><span class="kw-2">mut </span>c = GraphemeCursor::new(<span class="number">3</span>, s.len(), <span class="bool-val">true</span>); |
| <span class="macro">assert_eq!</span>( |
| c.prev_boundary(<span class="kw-2">&</span>s[<span class="number">2</span>..], <span class="number">2</span>), |
| <span class="prelude-val">Err</span>(GraphemeIncomplete::PrevChunk) |
| ); |
| <span class="macro">assert_eq!</span>(c.prev_boundary(<span class="kw-2">&</span>s[..<span class="number">2</span>], <span class="number">0</span>), <span class="prelude-val">Ok</span>(<span class="prelude-val">Some</span>(<span class="number">2</span>))); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>test_grapheme_cursor_prev_boundary_chunk_start() { |
| <span class="kw">let </span>s = <span class="string">"abcd"</span>; |
| <span class="kw">let </span><span class="kw-2">mut </span>c = GraphemeCursor::new(<span class="number">2</span>, s.len(), <span class="bool-val">true</span>); |
| <span class="macro">assert_eq!</span>( |
| c.prev_boundary(<span class="kw-2">&</span>s[<span class="number">2</span>..], <span class="number">2</span>), |
| <span class="prelude-val">Err</span>(GraphemeIncomplete::PrevChunk) |
| ); |
| <span class="macro">assert_eq!</span>(c.prev_boundary(<span class="kw-2">&</span>s[..<span class="number">2</span>], <span class="number">0</span>), <span class="prelude-val">Ok</span>(<span class="prelude-val">Some</span>(<span class="number">1</span>))); |
| } |
| </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> |
