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| </pre><pre class="rust"><code><span class="kw">use </span><span class="kw">crate</span>::lookups::{ |
| canonical_combining_class, canonical_fully_decomposed, compatibility_fully_decomposed, |
| stream_safe_trailing_nonstarters, |
| }; |
| <span class="kw">use </span><span class="kw">crate</span>::normalize::{hangul_decomposition_length, is_hangul_syllable}; |
| <span class="kw">use </span><span class="kw">crate</span>::tables::stream_safe_leading_nonstarters; |
| |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">const </span>MAX_NONSTARTERS: usize = <span class="number">30</span>; |
| <span class="kw">const </span>COMBINING_GRAPHEME_JOINER: char = <span class="string">'\u{034F}'</span>; |
| |
| <span class="doccomment">/// UAX15-D4: This iterator keeps track of how many non-starters there have been |
| /// since the last starter in *NFKD* and will emit a Combining Grapheme Joiner |
| /// (U+034F) if the count exceeds 30. |
| </span><span class="kw">pub struct </span>StreamSafe<I> { |
| iter: I, |
| nonstarter_count: usize, |
| buffer: <span class="prelude-ty">Option</span><char>, |
| } |
| |
| <span class="kw">impl</span><I> StreamSafe<I> { |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>new(iter: I) -> <span class="self">Self </span>{ |
| <span class="self">Self </span>{ |
| iter, |
| nonstarter_count: <span class="number">0</span>, |
| buffer: <span class="prelude-val">None</span>, |
| } |
| } |
| } |
| |
| <span class="kw">impl</span><I: Iterator<Item = char>> Iterator <span class="kw">for </span>StreamSafe<I> { |
| <span class="kw">type </span>Item = char; |
| |
| <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><char> { |
| <span class="kw">let </span>next_ch = <span class="kw">match </span><span class="self">self</span>.buffer.take().or_else(|| <span class="self">self</span>.iter.next()) { |
| <span class="prelude-val">None </span>=> <span class="kw">return </span><span class="prelude-val">None</span>, |
| <span class="prelude-val">Some</span>(c) => c, |
| }; |
| <span class="kw">let </span>d = classify_nonstarters(next_ch); |
| <span class="kw">if </span><span class="self">self</span>.nonstarter_count + d.leading_nonstarters > MAX_NONSTARTERS { |
| <span class="comment">// Since we're emitting a CGJ, the suffix of the emitted string in NFKD has no trailing |
| // nonstarters, so we can reset the counter to zero. Put `next_ch` back into the |
| // iterator (via `self.buffer`), and we'll reclassify it next iteration. |
| </span><span class="self">self</span>.nonstarter_count = <span class="number">0</span>; |
| <span class="self">self</span>.buffer = <span class="prelude-val">Some</span>(next_ch); |
| <span class="kw">return </span><span class="prelude-val">Some</span>(COMBINING_GRAPHEME_JOINER); |
| } |
| |
| <span class="comment">// Is the character all nonstarters in NFKD? If so, increment our counter of contiguous |
| // nonstarters in NKFD. |
| </span><span class="kw">if </span>d.leading_nonstarters == d.decomposition_len { |
| <span class="self">self</span>.nonstarter_count += d.decomposition_len; |
| } |
| <span class="comment">// Otherwise, reset the counter to the decomposition's number of trailing nonstarters. |
| </span><span class="kw">else </span>{ |
| <span class="self">self</span>.nonstarter_count = d.trailing_nonstarters; |
| } |
| <span class="prelude-val">Some</span>(next_ch) |
| } |
| } |
| |
| <span class="attribute">#[derive(Debug)] |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">struct </span>Decomposition { |
| <span class="kw">pub</span>(<span class="kw">crate</span>) leading_nonstarters: usize, |
| <span class="kw">pub</span>(<span class="kw">crate</span>) trailing_nonstarters: usize, |
| <span class="kw">pub</span>(<span class="kw">crate</span>) decomposition_len: usize, |
| } |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>classify_nonstarters(c: char) -> Decomposition { |
| <span class="comment">// As usual, fast path for ASCII (which is always a starter) |
| </span><span class="kw">if </span>c <= <span class="string">'\x7f' </span>{ |
| <span class="kw">return </span>Decomposition { |
| leading_nonstarters: <span class="number">0</span>, |
| trailing_nonstarters: <span class="number">0</span>, |
| decomposition_len: <span class="number">1</span>, |
| }; |
| } |
| <span class="comment">// Next, special case Hangul, since it's not handled by our tables. |
| </span><span class="kw">if </span>is_hangul_syllable(c) { |
| <span class="kw">return </span>Decomposition { |
| leading_nonstarters: <span class="number">0</span>, |
| trailing_nonstarters: <span class="number">0</span>, |
| decomposition_len: hangul_decomposition_length(c), |
| }; |
| } |
| <span class="kw">let </span>decomp = compatibility_fully_decomposed(c).or_else(|| canonical_fully_decomposed(c)); |
| <span class="kw">match </span>decomp { |
| <span class="prelude-val">Some</span>(decomp) => Decomposition { |
| leading_nonstarters: stream_safe_leading_nonstarters(c), |
| trailing_nonstarters: stream_safe_trailing_nonstarters(c), |
| decomposition_len: decomp.len(), |
| }, |
| <span class="prelude-val">None </span>=> { |
| <span class="kw">let </span>is_nonstarter = canonical_combining_class(c) != <span class="number">0</span>; |
| <span class="kw">let </span>nonstarter = <span class="kw">if </span>is_nonstarter { <span class="number">1 </span>} <span class="kw">else </span>{ <span class="number">0 </span>}; |
| Decomposition { |
| leading_nonstarters: nonstarter, |
| trailing_nonstarters: nonstarter, |
| decomposition_len: <span class="number">1</span>, |
| } |
| } |
| } |
| } |
| |
| <span class="attribute">#[cfg(test)] |
| </span><span class="kw">mod </span>tests { |
| <span class="kw">use super</span>::{classify_nonstarters, StreamSafe}; |
| <span class="kw">use </span><span class="kw">crate</span>::lookups::canonical_combining_class; |
| <span class="kw">use </span><span class="kw">crate</span>::normalize::decompose_compatible; |
| |
| <span class="attribute">#[cfg(not(feature = <span class="string">"std"</span>))] |
| </span><span class="kw">use </span><span class="kw">crate</span>::no_std_prelude::<span class="kw-2">*</span>; |
| |
| <span class="kw">use </span>core::char; |
| |
| <span class="kw">fn </span>stream_safe(s: <span class="kw-2">&</span>str) -> String { |
| StreamSafe::new(s.chars()).collect() |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>test_simple() { |
| <span class="kw">let </span>technically_okay = <span class="string">"Da\u{0300}\u{0301}\u{0302}\u{0303}\u{0304}\u{0305}\u{0306}\u{0307}\u{0308}\u{0309}\u{030a}\u{030b}\u{030c}\u{030d}\u{030e}\u{030f}\u{0310}\u{0311}\u{0312}\u{0313}\u{0314}\u{0315}\u{0316}\u{0317}\u{0318}\u{0319}\u{031a}\u{031b}\u{031c}\u{031d}ngerzone"</span>; |
| <span class="macro">assert_eq!</span>(stream_safe(technically_okay), technically_okay); |
| |
| <span class="kw">let </span>too_much = <span class="string">"Da\u{0300}\u{0301}\u{0302}\u{0303}\u{0304}\u{0305}\u{0306}\u{0307}\u{0308}\u{0309}\u{030a}\u{030b}\u{030c}\u{030d}\u{030e}\u{030f}\u{0310}\u{0311}\u{0312}\u{0313}\u{0314}\u{0315}\u{0316}\u{0317}\u{0318}\u{0319}\u{031a}\u{031b}\u{031c}\u{031d}\u{032e}ngerzone"</span>; |
| <span class="kw">let </span>fixed_it = <span class="string">"Da\u{0300}\u{0301}\u{0302}\u{0303}\u{0304}\u{0305}\u{0306}\u{0307}\u{0308}\u{0309}\u{030a}\u{030b}\u{030c}\u{030d}\u{030e}\u{030f}\u{0310}\u{0311}\u{0312}\u{0313}\u{0314}\u{0315}\u{0316}\u{0317}\u{0318}\u{0319}\u{031a}\u{031b}\u{031c}\u{031d}\u{034f}\u{032e}ngerzone"</span>; |
| <span class="macro">assert_eq!</span>(stream_safe(too_much), fixed_it); |
| |
| <span class="kw">let </span>woah_nelly = <span class="string">"Da\u{0300}\u{0301}\u{0302}\u{0303}\u{0304}\u{0305}\u{0306}\u{0307}\u{0308}\u{0309}\u{030a}\u{030b}\u{030c}\u{030d}\u{030e}\u{030f}\u{0310}\u{0311}\u{0312}\u{0313}\u{0314}\u{0315}\u{0316}\u{0317}\u{0318}\u{0319}\u{031a}\u{031b}\u{031c}\u{031d}\u{032e}\u{0300}\u{0301}\u{0302}\u{0303}\u{0304}\u{0305}\u{0306}\u{0307}\u{0308}\u{0309}\u{030a}\u{030b}\u{030c}\u{030d}\u{030e}\u{030f}\u{0310}\u{0311}\u{0312}\u{0313}\u{0314}\u{0315}\u{0316}\u{0317}\u{0318}\u{0319}\u{031a}\u{031b}\u{031c}\u{031d}\u{032e}ngerzone"</span>; |
| <span class="kw">let </span>its_cool = <span class="string">"Da\u{0300}\u{0301}\u{0302}\u{0303}\u{0304}\u{0305}\u{0306}\u{0307}\u{0308}\u{0309}\u{030a}\u{030b}\u{030c}\u{030d}\u{030e}\u{030f}\u{0310}\u{0311}\u{0312}\u{0313}\u{0314}\u{0315}\u{0316}\u{0317}\u{0318}\u{0319}\u{031a}\u{031b}\u{031c}\u{031d}\u{034f}\u{032e}\u{0300}\u{0301}\u{0302}\u{0303}\u{0304}\u{0305}\u{0306}\u{0307}\u{0308}\u{0309}\u{030a}\u{030b}\u{030c}\u{030d}\u{030e}\u{030f}\u{0310}\u{0311}\u{0312}\u{0313}\u{0314}\u{0315}\u{0316}\u{0317}\u{0318}\u{0319}\u{031a}\u{031b}\u{031c}\u{034f}\u{031d}\u{032e}ngerzone"</span>; |
| <span class="macro">assert_eq!</span>(stream_safe(woah_nelly), its_cool); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>test_all_nonstarters() { |
| <span class="kw">let </span>s = <span class="string">"\u{0300}\u{0300}\u{0300}\u{0300}\u{0300}\u{0300}\u{0300}\u{0300}\u{0300}\u{0300}\u{0300}\u{0300}\u{0300}\u{0300}\u{0300}\u{0300}\u{0300}\u{0300}\u{0300}\u{0300}\u{0300}\u{0300}\u{0300}\u{0300}\u{0300}\u{0300}\u{0300}\u{0300}\u{0300}\u{0300}\u{0300}\u{0300}\u{0300}\u{0300}\u{0300}\u{0300}\u{0300}\u{0300}\u{0300}\u{0300}"</span>; |
| <span class="kw">let </span>expected = <span class="string">"\u{300}\u{300}\u{300}\u{300}\u{300}\u{300}\u{300}\u{300}\u{300}\u{300}\u{300}\u{300}\u{300}\u{300}\u{300}\u{300}\u{300}\u{300}\u{300}\u{300}\u{300}\u{300}\u{300}\u{300}\u{300}\u{300}\u{300}\u{300}\u{300}\u{300}\u{034F}\u{300}\u{300}\u{300}\u{300}\u{300}\u{300}\u{300}\u{300}\u{300}\u{300}"</span>; |
| <span class="macro">assert_eq!</span>(stream_safe(s), expected); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>test_classify_nonstarters() { |
| <span class="comment">// Highest character in the `compat_fully_decomp` table is 2FA1D |
| </span><span class="kw">for </span>ch <span class="kw">in </span><span class="number">0</span>..<span class="number">0x2FA1E </span>{ |
| <span class="kw">let </span>ch = <span class="kw">match </span>char::from_u32(ch) { |
| <span class="prelude-val">Some</span>(c) => c, |
| <span class="prelude-val">None </span>=> <span class="kw">continue</span>, |
| }; |
| <span class="kw">let </span>c = classify_nonstarters(ch); |
| <span class="kw">let </span><span class="kw-2">mut </span>s = Vec::new(); |
| decompose_compatible(ch, |c| s.push(c)); |
| |
| <span class="macro">assert_eq!</span>(s.len(), c.decomposition_len); |
| |
| <span class="kw">let </span>num_leading = s |
| .iter() |
| .take_while(|<span class="kw-2">&</span>c| canonical_combining_class(<span class="kw-2">*</span>c) != <span class="number">0</span>) |
| .count(); |
| <span class="kw">let </span>num_trailing = s |
| .iter() |
| .rev() |
| .take_while(|<span class="kw-2">&</span>c| canonical_combining_class(<span class="kw-2">*</span>c) != <span class="number">0</span>) |
| .count(); |
| |
| <span class="macro">assert_eq!</span>(num_leading, c.leading_nonstarters); |
| <span class="macro">assert_eq!</span>(num_trailing, c.trailing_nonstarters); |
| } |
| } |
| } |
| </code></pre></div> |
| </section></div></main><div id="rustdoc-vars" data-root-path="../../" data-current-crate="unicode_normalization" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |
