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</pre><div class="example-wrap"><pre class="rust ">
<span class="doccomment">//! Operations on ASCII strings and characters.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! Most string operations in Rust act on UTF-8 strings. However, at times it</span>
<span class="doccomment">//! makes more sense to only consider the ASCII character set for a specific</span>
<span class="doccomment">//! operation.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! The [`AsciiExt`] trait provides methods that allow for character</span>
<span class="doccomment">//! operations that only act on the ASCII subset and leave non-ASCII characters</span>
<span class="doccomment">//! alone.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! The [`escape_default`] function provides an iterator over the bytes of an</span>
<span class="doccomment">//! escaped version of the character given.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! [`AsciiExt`]: trait.AsciiExt.html</span>
<span class="doccomment">//! [`escape_default`]: fn.escape_default.html</span>
<span class="attribute">#![<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident">core</span>::<span class="ident">ascii</span>::{<span class="ident">EscapeDefault</span>, <span class="ident">escape_default</span>};
<span class="doccomment">/// Extension methods for ASCII-subset only operations.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Be aware that operations on seemingly non-ASCII characters can sometimes</span>
<span class="doccomment">/// have unexpected results. Consider this example:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::ascii::AsciiExt;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!(AsciiExt::to_ascii_uppercase("café"), "CAFÉ");</span>
<span class="doccomment">/// assert_eq!(AsciiExt::to_ascii_uppercase("café"), "CAFé");</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">///</span>
<span class="doccomment">/// In the first example, the lowercased string is represented `"cafe\u{301}"`</span>
<span class="doccomment">/// (the last character is an acute accent [combining character]). Unlike the</span>
<span class="doccomment">/// other characters in the string, the combining character will not get mapped</span>
<span class="doccomment">/// to an uppercase variant, resulting in `"CAFE\u{301}"`. In the second</span>
<span class="doccomment">/// example, the lowercased string is represented `"caf\u{e9}"` (the last</span>
<span class="doccomment">/// character is a single Unicode character representing an 'e' with an acute</span>
<span class="doccomment">/// accent). Since the last character is defined outside the scope of ASCII,</span>
<span class="doccomment">/// it will not get mapped to an uppercase variant, resulting in `"CAF\u{e9}"`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [combining character]: https://en.wikipedia.org/wiki/Combining_character</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="attribute">#[<span class="ident">rustc_deprecated</span>(<span class="ident">since</span> <span class="op">=</span> <span class="string">"1.26.0"</span>, <span class="ident">reason</span> <span class="op">=</span> <span class="string">"use inherent methods instead"</span>)]</span>
<span class="kw">pub</span> <span class="kw">trait</span> <span class="ident">AsciiExt</span> {
<span class="doccomment">/// Container type for copied ASCII characters.</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">type</span> <span class="ident">Owned</span>;
<span class="doccomment">/// Checks if the value is within the ASCII range.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Note</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This method will be deprecated in favor of the identically-named</span>
<span class="doccomment">/// inherent methods on `u8`, `char`, `[u8]` and `str`.</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</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="doccomment">/// Makes a copy of the value in its ASCII upper case equivalent.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ASCII letters 'a' to 'z' are mapped to 'A' to 'Z',</span>
<span class="doccomment">/// but non-ASCII letters are unchanged.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// To uppercase the value in-place, use [`make_ascii_uppercase`].</span>
<span class="doccomment">///</span>
<span class="doccomment">/// To uppercase ASCII characters in addition to non-ASCII characters, use</span>
<span class="doccomment">/// [`str::to_uppercase`].</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Note</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This method will be deprecated in favor of the identically-named</span>
<span class="doccomment">/// inherent methods on `u8`, `char`, `[u8]` and `str`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`make_ascii_uppercase`]: #tymethod.make_ascii_uppercase</span>
<span class="doccomment">/// [`str::to_uppercase`]: ../primitive.str.html#method.to_uppercase</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="attribute">#[<span class="ident">allow</span>(<span class="ident">deprecated</span>)]</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="ident">Owned</span>;
<span class="doccomment">/// Makes a copy of the value in its ASCII lower case equivalent.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ASCII letters 'A' to 'Z' are mapped to 'a' to 'z',</span>
<span class="doccomment">/// but non-ASCII letters are unchanged.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// To lowercase the value in-place, use [`make_ascii_lowercase`].</span>
<span class="doccomment">///</span>
<span class="doccomment">/// To lowercase ASCII characters in addition to non-ASCII characters, use</span>
<span class="doccomment">/// [`str::to_lowercase`].</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Note</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This method will be deprecated in favor of the identically-named</span>
<span class="doccomment">/// inherent methods on `u8`, `char`, `[u8]` and `str`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`make_ascii_lowercase`]: #tymethod.make_ascii_lowercase</span>
<span class="doccomment">/// [`str::to_lowercase`]: ../primitive.str.html#method.to_lowercase</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="attribute">#[<span class="ident">allow</span>(<span class="ident">deprecated</span>)]</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="ident">Owned</span>;
<span class="doccomment">/// Checks that two values are an ASCII case-insensitive match.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Same as `to_ascii_lowercase(a) == to_ascii_lowercase(b)`,</span>
<span class="doccomment">/// but without allocating and copying temporaries.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Note</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This method will be deprecated in favor of the identically-named</span>
<span class="doccomment">/// inherent methods on `u8`, `char`, `[u8]` and `str`.</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</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="doccomment">/// Converts this type to its ASCII upper case equivalent in-place.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ASCII letters 'a' to 'z' are mapped to 'A' to 'Z',</span>
<span class="doccomment">/// but non-ASCII letters are unchanged.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// To return a new uppercased value without modifying the existing one, use</span>
<span class="doccomment">/// [`to_ascii_uppercase`].</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Note</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This method will be deprecated in favor of the identically-named</span>
<span class="doccomment">/// inherent methods on `u8`, `char`, `[u8]` and `str`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`to_ascii_uppercase`]: #tymethod.to_ascii_uppercase</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"ascii"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.9.0"</span>)]</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="doccomment">/// Converts this type to its ASCII lower case equivalent in-place.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ASCII letters 'A' to 'Z' are mapped to 'a' to 'z',</span>
<span class="doccomment">/// but non-ASCII letters are unchanged.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// To return a new lowercased value without modifying the existing one, use</span>
<span class="doccomment">/// [`to_ascii_lowercase`].</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Note</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This method will be deprecated in favor of the identically-named</span>
<span class="doccomment">/// inherent methods on `u8`, `char`, `[u8]` and `str`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`to_ascii_lowercase`]: #tymethod.to_ascii_lowercase</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"ascii"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.9.0"</span>)]</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="macro">macro_rules</span><span class="macro">!</span> <span class="ident">delegating_ascii_methods</span> {
() <span class="op">=></span> {
<span class="attribute">#[<span class="ident">inline</span>]</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">is_ascii</span>() }
<span class="attribute">#[<span class="ident">inline</span>]</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="ident">Owned</span> { <span class="self">self</span>.<span class="ident">to_ascii_uppercase</span>() }
<span class="attribute">#[<span class="ident">inline</span>]</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="ident">Owned</span> { <span class="self">self</span>.<span class="ident">to_ascii_lowercase</span>() }
<span class="attribute">#[<span class="ident">inline</span>]</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">o</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">eq_ignore_ascii_case</span>(<span class="ident">o</span>) }
<span class="attribute">#[<span class="ident">inline</span>]</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="self">self</span>.<span class="ident">make_ascii_uppercase</span>(); }
<span class="attribute">#[<span class="ident">inline</span>]</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="self">self</span>.<span class="ident">make_ascii_lowercase</span>(); }
}
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="attribute">#[<span class="ident">allow</span>(<span class="ident">deprecated</span>)]</span>
<span class="kw">impl</span> <span class="ident">AsciiExt</span> <span class="kw">for</span> <span class="ident">u8</span> {
<span class="kw">type</span> <span class="ident">Owned</span> <span class="op">=</span> <span class="ident">u8</span>;
<span class="macro">delegating_ascii_methods</span><span class="macro">!</span>();
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="attribute">#[<span class="ident">allow</span>(<span class="ident">deprecated</span>)]</span>
<span class="kw">impl</span> <span class="ident">AsciiExt</span> <span class="kw">for</span> <span class="ident">char</span> {
<span class="kw">type</span> <span class="ident">Owned</span> <span class="op">=</span> <span class="ident">char</span>;
<span class="macro">delegating_ascii_methods</span><span class="macro">!</span>();
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="attribute">#[<span class="ident">allow</span>(<span class="ident">deprecated</span>)]</span>
<span class="kw">impl</span> <span class="ident">AsciiExt</span> <span class="kw">for</span> [<span class="ident">u8</span>] {
<span class="kw">type</span> <span class="ident">Owned</span> <span class="op">=</span> <span class="ident">Vec</span><span class="op"><</span><span class="ident">u8</span><span class="op">></span>;
<span class="macro">delegating_ascii_methods</span><span class="macro">!</span>();
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="attribute">#[<span class="ident">allow</span>(<span class="ident">deprecated</span>)]</span>
<span class="kw">impl</span> <span class="ident">AsciiExt</span> <span class="kw">for</span> <span class="ident">str</span> {
<span class="kw">type</span> <span class="ident">Owned</span> <span class="op">=</span> <span class="ident">String</span>;
<span class="macro">delegating_ascii_methods</span><span class="macro">!</span>();
}
</pre></div>
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