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</pre><pre class="rust"><code><span class="kw">use crate</span>::{lowercase, transform};
<span class="doccomment">/// This trait defines a snake case conversion.
///
/// In snake_case, word boundaries are indicated by underscores.
///
/// ## Example:
///
/// ```rust
/// use heck::SnakeCase;
///
/// let sentence = &quot;We carry a new world here, in our hearts.&quot;;
/// assert_eq!(sentence.to_snake_case(), &quot;we_carry_a_new_world_here_in_our_hearts&quot;);
/// ```
</span><span class="kw">pub trait </span>SnakeCase: ToOwned {
<span class="doccomment">/// Convert this type to snake case.
</span><span class="kw">fn </span>to_snake_case(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="self">Self</span>::Owned;
}
<span class="doccomment">/// Oh heck, SnekCase is an alias for SnakeCase. See SnakeCase for
/// more documentation.
</span><span class="kw">pub trait </span>SnekCase: ToOwned {
<span class="doccomment">/// Convert this type to snek case.
</span><span class="kw">fn </span>to_snek_case(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="self">Self</span>::Owned;
}
<span class="kw">impl</span>&lt;T: <span class="question-mark">?</span>Sized + SnakeCase&gt; SnekCase <span class="kw">for </span>T {
<span class="kw">fn </span>to_snek_case(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="self">Self</span>::Owned {
<span class="self">self</span>.to_snake_case()
}
}
<span class="kw">impl </span>SnakeCase <span class="kw">for </span>str {
<span class="kw">fn </span>to_snake_case(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; String {
transform(<span class="self">self</span>, lowercase, |s| s.push(<span class="string">&#39;_&#39;</span>))
}
}
<span class="attribute">#[cfg(test)]
</span><span class="kw">mod </span>tests {
<span class="kw">use </span><span class="kw">super</span>::SnakeCase;
<span class="macro">macro_rules! </span>t {
(<span class="macro-nonterminal">$t</span>:ident : <span class="macro-nonterminal">$s1</span>:expr =&gt; <span class="macro-nonterminal">$s2</span>:expr) =&gt; {
<span class="attribute">#[test]
</span><span class="kw">fn </span><span class="macro-nonterminal">$t</span>() {
<span class="macro">assert_eq!</span>(<span class="macro-nonterminal">$s1</span>.to_snake_case(), <span class="macro-nonterminal">$s2</span>)
}
};
}
<span class="macro">t!</span>(test1: <span class="string">&quot;CamelCase&quot; </span>=&gt; <span class="string">&quot;camel_case&quot;</span>);
<span class="macro">t!</span>(test2: <span class="string">&quot;This is Human case.&quot; </span>=&gt; <span class="string">&quot;this_is_human_case&quot;</span>);
<span class="macro">t!</span>(test3: <span class="string">&quot;MixedUP CamelCase, with some Spaces&quot; </span>=&gt; <span class="string">&quot;mixed_up_camel_case_with_some_spaces&quot;</span>);
<span class="macro">t!</span>(test4: <span class="string">&quot;mixed_up_ snake_case with some _spaces&quot; </span>=&gt; <span class="string">&quot;mixed_up_snake_case_with_some_spaces&quot;</span>);
<span class="macro">t!</span>(test5: <span class="string">&quot;kebab-case&quot; </span>=&gt; <span class="string">&quot;kebab_case&quot;</span>);
<span class="macro">t!</span>(test6: <span class="string">&quot;SHOUTY_SNAKE_CASE&quot; </span>=&gt; <span class="string">&quot;shouty_snake_case&quot;</span>);
<span class="macro">t!</span>(test7: <span class="string">&quot;snake_case&quot; </span>=&gt; <span class="string">&quot;snake_case&quot;</span>);
<span class="macro">t!</span>(test8: <span class="string">&quot;this-contains_ ALLKinds OfWord_Boundaries&quot; </span>=&gt; <span class="string">&quot;this_contains_all_kinds_of_word_boundaries&quot;</span>);
<span class="macro">t!</span>(test9: <span class="string">&quot;XΣXΣ baffle&quot; </span>=&gt; <span class="string">&quot;xσxς_baffle&quot;</span>);
<span class="macro">t!</span>(test10: <span class="string">&quot;XMLHttpRequest&quot; </span>=&gt; <span class="string">&quot;xml_http_request&quot;</span>);
<span class="macro">t!</span>(test11: <span class="string">&quot;FIELD_NAME11&quot; </span>=&gt; <span class="string">&quot;field_name11&quot;</span>);
<span class="macro">t!</span>(test12: <span class="string">&quot;99BOTTLES&quot; </span>=&gt; <span class="string">&quot;99bottles&quot;</span>);
<span class="macro">t!</span>(test13: <span class="string">&quot;FieldNamE11&quot; </span>=&gt; <span class="string">&quot;field_nam_e11&quot;</span>);
<span class="macro">t!</span>(test14: <span class="string">&quot;abc123def456&quot; </span>=&gt; <span class="string">&quot;abc123def456&quot;</span>);
<span class="macro">t!</span>(test16: <span class="string">&quot;abc123DEF456&quot; </span>=&gt; <span class="string">&quot;abc123_def456&quot;</span>);
<span class="macro">t!</span>(test17: <span class="string">&quot;abc123Def456&quot; </span>=&gt; <span class="string">&quot;abc123_def456&quot;</span>);
<span class="macro">t!</span>(test18: <span class="string">&quot;abc123DEf456&quot; </span>=&gt; <span class="string">&quot;abc123_d_ef456&quot;</span>);
<span class="macro">t!</span>(test19: <span class="string">&quot;ABC123def456&quot; </span>=&gt; <span class="string">&quot;abc123def456&quot;</span>);
<span class="macro">t!</span>(test20: <span class="string">&quot;ABC123DEF456&quot; </span>=&gt; <span class="string">&quot;abc123def456&quot;</span>);
<span class="macro">t!</span>(test21: <span class="string">&quot;ABC123Def456&quot; </span>=&gt; <span class="string">&quot;abc123_def456&quot;</span>);
<span class="macro">t!</span>(test22: <span class="string">&quot;ABC123DEf456&quot; </span>=&gt; <span class="string">&quot;abc123d_ef456&quot;</span>);
<span class="macro">t!</span>(test23: <span class="string">&quot;ABC123dEEf456FOO&quot; </span>=&gt; <span class="string">&quot;abc123d_e_ef456_foo&quot;</span>);
<span class="macro">t!</span>(test24: <span class="string">&quot;abcDEF&quot; </span>=&gt; <span class="string">&quot;abc_def&quot;</span>);
<span class="macro">t!</span>(test25: <span class="string">&quot;ABcDE&quot; </span>=&gt; <span class="string">&quot;a_bc_de&quot;</span>);
}
</code></pre></div>
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