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| </pre><pre class="rust "> |
| <span class="comment">/* Copyright 2016 Torbjørn Birch Moltu |
| * |
| * Licensed under the Apache License, Version 2.0, <LICENSE-APACHE or |
| * http://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> <span class="ident">Utf16Iterator</span>; |
| <span class="kw">use</span> <span class="ident">CharExt</span>; |
| <span class="kw">use</span> <span class="ident">errors</span>::{<span class="ident">InvalidUtf16Slice</span>,<span class="ident">InvalidUtf16Tuple</span>}; |
| <span class="kw">extern</span> <span class="kw">crate</span> <span class="ident">std</span>; |
| <span class="kw">use</span> <span class="ident">std</span>::{<span class="ident">hash</span>,<span class="ident">fmt</span>,<span class="ident">cmp</span>}; |
| <span class="kw">use</span> <span class="ident">std</span>::<span class="ident">borrow</span>::<span class="ident">Borrow</span>; |
| <span class="kw">use</span> <span class="ident">std</span>::<span class="ident">ops</span>::<span class="ident">Deref</span>; |
| |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span><span class="op">=</span><span class="string">"ascii"</span>)]</span> |
| <span class="kw">use</span> <span class="ident">std</span>::<span class="ident">ascii</span>::<span class="ident">AsciiExt</span>; |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span><span class="op">=</span><span class="string">"ascii"</span>)]</span> |
| <span class="kw">extern</span> <span class="kw">crate</span> <span class="ident">ascii</span>; |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span><span class="op">=</span><span class="string">"ascii"</span>)]</span> |
| <span class="kw">use</span> <span class="self">self</span>::<span class="ident">ascii</span>::{<span class="ident">Ascii</span>,<span class="ident">AsciiCast</span>}; |
| |
| |
| <span class="comment">// I don't think there is any good default value for char, but char does.</span> |
| <span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Default</span>)]</span> |
| <span class="comment">// char doesn't do anything more advanced than u32 for Eq/Ord, so we shouldn't either.</span> |
| <span class="comment">// When it's a single unit, the second is zero, so Eq works.</span> |
| <span class="comment">// Ord however, breaks on surrogate pairs.</span> |
| <span class="attribute">#[<span class="ident">derive</span>(<span class="ident">PartialEq</span>,<span class="ident">Eq</span>)]</span> |
| <span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Clone</span>,<span class="ident">Copy</span>)]</span> |
| |
| |
| <span class="doccomment">/// Store a `char` as UTF-16 so it can be borrowed as a slice</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// Size is identical to `char`.</span> |
| <span class="doccomment">/// Cannot represent all 2^32-1 possible values, but can do all valid ones.</span> |
| <span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Utf16Char</span> { |
| <span class="ident">units</span>: [<span class="ident">u16</span>; <span class="number">2</span>], |
| } |
| |
| |
| <span class="comment">/////////////////////</span> |
| <span class="comment">//conversion traits//</span> |
| <span class="comment">/////////////////////</span> |
| |
| <span class="kw">impl</span> <span class="ident">From</span><span class="op"><</span><span class="ident">char</span><span class="op">></span> <span class="kw">for</span> <span class="ident">Utf16Char</span> { |
| <span class="kw">fn</span> <span class="ident">from</span>(<span class="ident">c</span>: <span class="ident">char</span>) <span class="op">-></span> <span class="self">Self</span> { |
| <span class="kw">let</span> (<span class="ident">first</span>, <span class="ident">second</span>) <span class="op">=</span> <span class="ident">c</span>.<span class="ident">to_utf16_tuple</span>(); |
| <span class="ident">Utf16Char</span>{ <span class="ident">units</span>: [<span class="ident">first</span>, <span class="ident">second</span>.<span class="ident">unwrap_or</span>(<span class="number">0</span>)] } |
| } |
| } |
| <span class="kw">impl</span> <span class="ident">From</span><span class="op"><</span><span class="ident">Utf16Char</span><span class="op">></span> <span class="kw">for</span> <span class="ident">char</span> { |
| <span class="kw">fn</span> <span class="ident">from</span>(<span class="ident">uc</span>: <span class="ident">Utf16Char</span>) <span class="op">-></span> <span class="ident">char</span> { |
| <span class="kw">unsafe</span>{ <span class="ident">char</span>::<span class="ident">from_utf16_tuple_unchecked</span>(<span class="ident">uc</span>.<span class="ident">to_tuple</span>()) } |
| } |
| } |
| <span class="kw">impl</span> <span class="ident">IntoIterator</span> <span class="kw">for</span> <span class="ident">Utf16Char</span> { |
| <span class="kw">type</span> <span class="ident">Item</span><span class="op">=</span><span class="ident">u16</span>; |
| <span class="kw">type</span> <span class="ident">IntoIter</span><span class="op">=</span><span class="ident">Utf16Iterator</span>; |
| <span class="doccomment">/// Iterate over the units.</span> |
| <span class="kw">fn</span> <span class="ident">into_iter</span>(<span class="self">self</span>) <span class="op">-></span> <span class="ident">Utf16Iterator</span> { |
| <span class="ident">Utf16Iterator</span>::<span class="ident">from</span>(<span class="self">self</span>) |
| } |
| } |
| |
| |
| <span class="comment">/////////////////</span> |
| <span class="comment">//getter traits//</span> |
| <span class="comment">/////////////////</span> |
| <span class="kw">impl</span> <span class="ident">AsRef</span><span class="op"><</span>[<span class="ident">u16</span>]<span class="op">></span> <span class="kw">for</span> <span class="ident">Utf16Char</span> { |
| <span class="kw">fn</span> <span class="ident">as_ref</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="kw-2">&</span>[<span class="ident">u16</span>] { |
| <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">units</span>[..<span class="self">self</span>.<span class="ident">len</span>()] |
| } |
| } |
| <span class="kw">impl</span> <span class="ident">Borrow</span><span class="op"><</span>[<span class="ident">u16</span>]<span class="op">></span> <span class="kw">for</span> <span class="ident">Utf16Char</span> { |
| <span class="kw">fn</span> <span class="ident">borrow</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="kw-2">&</span>[<span class="ident">u16</span>] { |
| <span class="self">self</span>.<span class="ident">as_ref</span>() |
| } |
| } |
| <span class="kw">impl</span> <span class="ident">Deref</span> <span class="kw">for</span> <span class="ident">Utf16Char</span> { |
| <span class="kw">type</span> <span class="ident">Target</span> <span class="op">=</span> [<span class="ident">u16</span>]; |
| <span class="kw">fn</span> <span class="ident">deref</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="kw-2">&</span>[<span class="ident">u16</span>] { |
| <span class="self">self</span>.<span class="ident">as_ref</span>() |
| } |
| } |
| |
| |
| <span class="comment">////////////////</span> |
| <span class="comment">//ascii traits//</span> |
| <span class="comment">////////////////</span> |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span><span class="op">=</span><span class="string">"ascii"</span>)]</span> |
| <span class="doccomment">/// Requires feature "ascii".</span> |
| <span class="kw">impl</span> <span class="ident">AsciiExt</span> <span class="kw">for</span> <span class="ident">Utf16Char</span> { |
| <span class="kw">type</span> <span class="ident">Owned</span> <span class="op">=</span> <span class="self">Self</span>; |
| <span class="kw">fn</span> <span class="ident">is_ascii</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">bool</span> { |
| <span class="self">self</span>.<span class="ident">units</span>[<span class="number">0</span>] <span class="op"><</span> <span class="number">0x80</span> |
| } |
| <span class="kw">fn</span> <span class="ident">eq_ignore_ascii_case</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&</span><span class="self">Self</span>) <span class="op">-></span> <span class="ident">bool</span> { |
| <span class="self">self</span>.<span class="ident">to_char</span>().<span class="ident">eq_ignore_ascii_case</span>(<span class="kw-2">&</span><span class="ident">other</span>.<span class="ident">to_char</span>()) |
| } |
| <span class="kw">fn</span> <span class="ident">to_ascii_uppercase</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="self">Self</span> { |
| <span class="self">self</span>.<span class="ident">to_char</span>().<span class="ident">to_ascii_uppercase</span>().<span class="ident">to_utf16</span>() |
| } |
| <span class="kw">fn</span> <span class="ident">to_ascii_lowercase</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="self">Self</span> { |
| <span class="self">self</span>.<span class="ident">to_char</span>().<span class="ident">to_ascii_lowercase</span>().<span class="ident">to_utf16</span>() |
| } |
| <span class="comment">// Theese methods are what prevents this from becoming stable</span> |
| <span class="kw">fn</span> <span class="ident">make_ascii_uppercase</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) { |
| <span class="kw-2">*</span><span class="self">self</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">to_ascii_uppercase</span>() |
| } |
| <span class="kw">fn</span> <span class="ident">make_ascii_lowercase</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) { |
| <span class="kw-2">*</span><span class="self">self</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">to_ascii_lowercase</span>(); |
| } |
| } |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span><span class="op">=</span><span class="string">"ascii"</span>)]</span> |
| <span class="doccomment">/// Requires feature "ascii".</span> |
| <span class="kw">impl</span> <span class="ident">From</span><span class="op"><</span><span class="ident">Ascii</span><span class="op">></span> <span class="kw">for</span> <span class="ident">Utf16Char</span> { |
| <span class="kw">fn</span> <span class="ident">from</span>(<span class="ident">ac</span>: <span class="ident">Ascii</span>) <span class="op">-></span> <span class="self">Self</span> { |
| <span class="ident">Utf16Char</span>{ <span class="ident">units</span>: [<span class="ident">ac</span>.<span class="ident">as_byte</span>() <span class="kw">as</span> <span class="ident">u16</span>,<span class="number">0</span>] } |
| } |
| } |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span><span class="op">=</span><span class="string">"ascii"</span>)]</span> |
| <span class="doccomment">/// Requires feature "ascii".</span> |
| <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> <span class="ident">AsciiCast</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> <span class="kw">for</span> <span class="ident">Utf16Char</span> { |
| <span class="kw">type</span> <span class="ident">Target</span> <span class="op">=</span> <span class="ident">Ascii</span>; |
| <span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">to_ascii_nocheck</span>(<span class="kw-2">&</span><span class="lifetime">'a</span> <span class="self">self</span>) <span class="op">-></span> <span class="ident">Ascii</span> { |
| (<span class="self">self</span>.<span class="ident">units</span>[<span class="number">0</span>] <span class="kw">as</span> <span class="ident">u8</span>).<span class="ident">to_ascii_nocheck</span>() |
| } |
| } |
| |
| |
| <span class="comment">/////////////////////////////////////////////////////////</span> |
| <span class="comment">//Genaral traits that cannot be derived to emulate char//</span> |
| <span class="comment">/////////////////////////////////////////////////////////</span> |
| <span class="kw">impl</span> <span class="ident">hash</span>::<span class="ident">Hash</span> <span class="kw">for</span> <span class="ident">Utf16Char</span> { |
| <span class="kw">fn</span> <span class="ident">hash</span><span class="op"><</span><span class="ident">H</span> : <span class="ident">hash</span>::<span class="ident">Hasher</span><span class="op">></span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">state</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">H</span>) { |
| <span class="self">self</span>.<span class="ident">to_char</span>().<span class="ident">hash</span>(<span class="ident">state</span>); |
| } |
| } |
| <span class="kw">impl</span> <span class="ident">fmt</span>::<span class="ident">Debug</span> <span class="kw">for</span> <span class="ident">Utf16Char</span> { |
| <span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">fmtr</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span>) <span class="op">-></span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> { |
| <span class="ident">fmt</span>::<span class="ident">Debug</span>::<span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>.<span class="ident">to_char</span>(), <span class="ident">fmtr</span>) |
| } |
| } |
| <span class="kw">impl</span> <span class="ident">cmp</span>::<span class="ident">PartialOrd</span> <span class="kw">for</span> <span class="ident">Utf16Char</span> { |
| <span class="kw">fn</span> <span class="ident">partial_cmp</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">rhs</span>: <span class="kw-2">&</span><span class="self">Self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">cmp</span>::<span class="ident">Ordering</span><span class="op">></span> { |
| <span class="self">self</span>.<span class="ident">to_char</span>().<span class="ident">partial_cmp</span>(<span class="kw-2">&</span><span class="ident">rhs</span>.<span class="ident">to_char</span>()) |
| } |
| } |
| <span class="kw">impl</span> <span class="ident">cmp</span>::<span class="ident">Ord</span> <span class="kw">for</span> <span class="ident">Utf16Char</span> { |
| <span class="kw">fn</span> <span class="ident">cmp</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">rhs</span>: <span class="kw-2">&</span><span class="self">Self</span>) <span class="op">-></span> <span class="ident">cmp</span>::<span class="ident">Ordering</span> { |
| <span class="self">self</span>.<span class="ident">to_char</span>().<span class="ident">cmp</span>(<span class="kw-2">&</span><span class="ident">rhs</span>.<span class="ident">to_char</span>()) |
| } |
| } |
| |
| |
| <span class="comment">///////////////////////////////////////////////////////</span> |
| <span class="comment">//pub impls that should be together for nicer rustdoc//</span> |
| <span class="comment">///////////////////////////////////////////////////////</span> |
| <span class="kw">impl</span> <span class="ident">Utf16Char</span> { |
| <span class="doccomment">/// Validate and store the first UTF-16 codepoint in the slice.</span> |
| <span class="doccomment">/// Also return how many units were needed.</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">from_slice</span>(<span class="ident">src</span>: <span class="kw-2">&</span>[<span class="ident">u16</span>]) <span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span>(<span class="self">Self</span>,<span class="ident">usize</span>),<span class="ident">InvalidUtf16Slice</span><span class="op">></span> { |
| <span class="ident">char</span>::<span class="ident">from_utf16_slice</span>(<span class="ident">src</span>).<span class="ident">map</span>( |
| <span class="op">|</span>(_,<span class="ident">len</span>)<span class="op">|</span> (<span class="ident">Utf16Char</span>{ <span class="ident">units</span>: [<span class="ident">src</span>[<span class="number">0</span>], <span class="kw">if</span> <span class="ident">len</span><span class="op">==</span><span class="number">2</span> {<span class="ident">src</span>[<span class="number">1</span>]} <span class="kw">else</span> {<span class="number">0</span>}] }, <span class="ident">len</span>) |
| ) |
| } |
| <span class="doccomment">/// Validate and store a UTF-16 pair as returned from `char.to_utf16_tuple()`.</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">from_tuple</span>(<span class="ident">utf16</span>: (<span class="ident">u16</span>,<span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">u16</span><span class="op">></span>)) <span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="self">Self</span>,<span class="ident">InvalidUtf16Tuple</span><span class="op">></span> { |
| <span class="ident">char</span>::<span class="ident">from_utf16_tuple</span>(<span class="ident">utf16</span>).<span class="ident">map</span>( |
| <span class="op">|</span>_<span class="op">|</span> <span class="ident">Utf16Char</span>{ <span class="ident">units</span>: [<span class="ident">utf16</span>.<span class="number">0</span>, <span class="ident">utf16</span>.<span class="number">1</span>.<span class="ident">unwrap_or</span>(<span class="number">0</span>)] } |
| ) |
| } |
| |
| <span class="doccomment">/// Returns 1 or 2.</span> |
| <span class="doccomment">/// There is no `.is_emty()` because it would always return false.</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">len</span>(<span class="self">self</span>) <span class="op">-></span> <span class="ident">usize</span> { |
| <span class="kw">if</span> <span class="self">self</span>.<span class="ident">units</span>[<span class="number">1</span>] <span class="op">==</span> <span class="number">0</span> {<span class="number">1</span>} <span class="kw">else</span> {<span class="number">2</span>} |
| } |
| |
| <span class="doccomment">/// Convert from UTF-16 to UTF-32</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">to_char</span>(<span class="self">self</span>) <span class="op">-></span> <span class="ident">char</span> { |
| <span class="self">self</span>.<span class="ident">into</span>() |
| } |
| <span class="doccomment">/// Write the internal representation to a slice,</span> |
| <span class="doccomment">/// and then returns the number of `u16`s written.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// `None` is returned if the buffer is too small; then the buffer is left unmodified.</span> |
| <span class="doccomment">/// A buffer of length two is always large enough.</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">to_slice</span>(<span class="self">self</span>, <span class="ident">dst</span>: <span class="kw-2">&</span><span class="kw-2">mut</span>[<span class="ident">u16</span>]) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span> { |
| <span class="kw">if</span> <span class="self">self</span>.<span class="ident">len</span>() <span class="op"><=</span> <span class="ident">dst</span>.<span class="ident">len</span>() { |
| <span class="ident">dst</span>[<span class="number">0</span>] <span class="op">=</span> <span class="self">self</span>.<span class="ident">units</span>[<span class="number">0</span>]; |
| <span class="kw">if</span> <span class="self">self</span>.<span class="ident">len</span>() <span class="op">==</span> <span class="number">2</span> { |
| <span class="ident">dst</span>[<span class="number">1</span>] <span class="op">=</span> <span class="self">self</span>.<span class="ident">units</span>[<span class="number">1</span>]; |
| } |
| <span class="prelude-val">Some</span>(<span class="self">self</span>.<span class="ident">len</span>()) |
| } <span class="kw">else</span> { |
| <span class="prelude-val">None</span> |
| } |
| } |
| <span class="doccomment">/// The second `u16` is used for surrogate pairs.</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">to_tuple</span>(<span class="self">self</span>) <span class="op">-></span> (<span class="ident">u16</span>,<span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">u16</span><span class="op">></span>) { |
| (<span class="self">self</span>.<span class="ident">units</span>[<span class="number">0</span>], <span class="kw">if</span> <span class="self">self</span>.<span class="ident">len</span>()<span class="op">==</span><span class="number">2</span> {<span class="prelude-val">Some</span>(<span class="self">self</span>.<span class="ident">units</span>[<span class="number">1</span>])} <span class="kw">else</span> {<span class="prelude-val">None</span>}) |
| } |
| } |
| </pre> |
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