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<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Source of the Rust file `/home/newkirk/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/ident_case-1.0.1/src/lib.rs`."><title>lib.rs - source</title><script>if(window.location.protocol!=="file:")document.head.insertAdjacentHTML("beforeend","SourceSerif4-Regular-6b053e98.ttf.woff2,FiraSans-Italic-81dc35de.woff2,FiraSans-Regular-0fe48ade.woff2,FiraSans-MediumItalic-ccf7e434.woff2,FiraSans-Medium-e1aa3f0a.woff2,SourceCodePro-Regular-8badfe75.ttf.woff2,SourceCodePro-Semibold-aa29a496.ttf.woff2".split(",").map(f=>`<link rel="preload" as="font" type="font/woff2"href="../../static.files/${f}">`).join(""))</script><link rel="stylesheet" href="../../static.files/normalize-9960930a.css"><link rel="stylesheet" href="../../static.files/rustdoc-ca0dd0c4.css"><meta name="rustdoc-vars" data-root-path="../../" data-static-root-path="../../static.files/" data-current-crate="ident_case" data-themes="" data-resource-suffix="" data-rustdoc-version="1.93.1 (01f6ddf75 2026-02-11) (Arch Linux rust 1:1.93.1-1)" data-channel="1.93.1" data-search-js="search-9e2438ea.js" data-stringdex-js="stringdex-a3946164.js" data-settings-js="settings-c38705f0.js" ><script src="../../static.files/storage-e2aeef58.js"></script><script defer src="../../static.files/src-script-813739b1.js"></script><script defer src="../../src-files.js"></script><script defer src="../../static.files/main-a410ff4d.js"></script><noscript><link rel="stylesheet" href="../../static.files/noscript-263c88ec.css"></noscript><link rel="alternate icon" type="image/png" href="../../static.files/favicon-32x32-eab170b8.png"><link rel="icon" type="image/svg+xml" href="../../static.files/favicon-044be391.svg"></head><body class="rustdoc src"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><div class="src-sidebar-title"><h2>Files</h2></div></nav><div class="sidebar-resizer" title="Drag to resize sidebar"></div><main><section id="main-content" class="content"><div class="main-heading"><h1><div class="sub-heading">ident_case/</div>lib.rs</h1><rustdoc-toolbar></rustdoc-toolbar></div><div class="example-wrap digits-3"><pre class="rust"><code><a href=#1 id=1 data-nosnippet>1</a><span class="doccomment">//! Crate for changing case of Rust identifiers.
<a href=#2 id=2 data-nosnippet>2</a>//!
<a href=#3 id=3 data-nosnippet>3</a>//! # Features
<a href=#4 id=4 data-nosnippet>4</a>//! * Supports `snake_case`, `lowercase`, `camelCase`,
<a href=#5 id=5 data-nosnippet>5</a>//! `PascalCase`, `SCREAMING_SNAKE_CASE`, and `kebab-case`
<a href=#6 id=6 data-nosnippet>6</a>//! * Rename variants, and fields
<a href=#7 id=7 data-nosnippet>7</a>//!
<a href=#8 id=8 data-nosnippet>8</a>//! # Examples
<a href=#9 id=9 data-nosnippet>9</a>//! ```rust
<a href=#10 id=10 data-nosnippet>10</a>//! use ident_case::RenameRule;
<a href=#11 id=11 data-nosnippet>11</a>//!
<a href=#12 id=12 data-nosnippet>12</a>//! assert_eq!("helloWorld", RenameRule::CamelCase.apply_to_field("hello_world"));
<a href=#13 id=13 data-nosnippet>13</a>//!
<a href=#14 id=14 data-nosnippet>14</a>//! assert_eq!("i_love_serde", RenameRule::SnakeCase.apply_to_variant("ILoveSerde"));
<a href=#15 id=15 data-nosnippet>15</a>//! ```
<a href=#16 id=16 data-nosnippet>16</a>
<a href=#17 id=17 data-nosnippet>17</a></span><span class="comment">// Copyright 2017 Serde Developers
<a href=#18 id=18 data-nosnippet>18</a>//
<a href=#19 id=19 data-nosnippet>19</a>// Licensed under the Apache License, Version 2.0 &lt;LICENSE-APACHE or
<a href=#20 id=20 data-nosnippet>20</a>// http://www.apache.org/licenses/LICENSE-2.0&gt; or the MIT license
<a href=#21 id=21 data-nosnippet>21</a>// &lt;LICENSE-MIT or http://opensource.org/licenses/MIT&gt;, at your
<a href=#22 id=22 data-nosnippet>22</a>// option. This file may not be copied, modified, or distributed
<a href=#23 id=23 data-nosnippet>23</a>// except according to those terms.
<a href=#24 id=24 data-nosnippet>24</a>
<a href=#25 id=25 data-nosnippet>25</a></span><span class="kw">use </span>std::ascii::AsciiExt;
<a href=#26 id=26 data-nosnippet>26</a><span class="kw">use </span>std::str::FromStr;
<a href=#27 id=27 data-nosnippet>27</a>
<a href=#28 id=28 data-nosnippet>28</a><span class="kw">use </span><span class="self">self</span>::RenameRule::<span class="kw-2">*</span>;
<a href=#29 id=29 data-nosnippet>29</a>
<a href=#30 id=30 data-nosnippet>30</a><span class="doccomment">/// A casing rule for renaming Rust identifiers.
<a href=#31 id=31 data-nosnippet>31</a></span><span class="attr">#[derive(Debug, PartialEq, Eq, Clone, Copy)]
<a href=#32 id=32 data-nosnippet>32</a></span><span class="kw">pub enum </span>RenameRule {
<a href=#33 id=33 data-nosnippet>33</a> <span class="doccomment">/// No-op rename rule.
<a href=#34 id=34 data-nosnippet>34</a> </span><span class="prelude-val">None</span>,
<a href=#35 id=35 data-nosnippet>35</a> <span class="doccomment">/// Rename direct children to "lowercase" style.
<a href=#36 id=36 data-nosnippet>36</a> </span>LowerCase,
<a href=#37 id=37 data-nosnippet>37</a> <span class="doccomment">/// Rename direct children to "PascalCase" style, as typically used for enum variants.
<a href=#38 id=38 data-nosnippet>38</a> </span>PascalCase,
<a href=#39 id=39 data-nosnippet>39</a> <span class="doccomment">/// Rename direct children to "camelCase" style.
<a href=#40 id=40 data-nosnippet>40</a> </span>CamelCase,
<a href=#41 id=41 data-nosnippet>41</a> <span class="doccomment">/// Rename direct children to "snake_case" style, as commonly used for fields.
<a href=#42 id=42 data-nosnippet>42</a> </span>SnakeCase,
<a href=#43 id=43 data-nosnippet>43</a> <span class="doccomment">/// Rename direct children to "SCREAMING_SNAKE_CASE" style, as commonly used for constants.
<a href=#44 id=44 data-nosnippet>44</a> </span>ScreamingSnakeCase,
<a href=#45 id=45 data-nosnippet>45</a> <span class="doccomment">/// Rename direct children to "kebab-case" style.
<a href=#46 id=46 data-nosnippet>46</a> </span>KebabCase,
<a href=#47 id=47 data-nosnippet>47</a>}
<a href=#48 id=48 data-nosnippet>48</a>
<a href=#49 id=49 data-nosnippet>49</a><span class="kw">impl </span>RenameRule {
<a href=#50 id=50 data-nosnippet>50</a> <span class="doccomment">/// Change case of a `PascalCase` variant.
<a href=#51 id=51 data-nosnippet>51</a> </span><span class="kw">pub fn </span>apply_to_variant&lt;S: AsRef&lt;str&gt;&gt;(<span class="kw-2">&amp;</span><span class="self">self</span>, variant: S) -&gt; String {
<a href=#52 id=52 data-nosnippet>52</a>
<a href=#53 id=53 data-nosnippet>53</a> <span class="kw">let </span>variant = variant.as_ref();
<a href=#54 id=54 data-nosnippet>54</a> <span class="kw">match </span><span class="kw-2">*</span><span class="self">self </span>{
<a href=#55 id=55 data-nosnippet>55</a> <span class="prelude-val">None </span>| PascalCase =&gt; variant.to_owned(),
<a href=#56 id=56 data-nosnippet>56</a> LowerCase =&gt; variant.to_ascii_lowercase(),
<a href=#57 id=57 data-nosnippet>57</a> CamelCase =&gt; variant[..<span class="number">1</span>].to_ascii_lowercase() + <span class="kw-2">&amp;</span>variant[<span class="number">1</span>..],
<a href=#58 id=58 data-nosnippet>58</a> SnakeCase =&gt; {
<a href=#59 id=59 data-nosnippet>59</a> <span class="kw">let </span><span class="kw-2">mut </span>snake = String::new();
<a href=#60 id=60 data-nosnippet>60</a> <span class="kw">for </span>(i, ch) <span class="kw">in </span>variant.char_indices() {
<a href=#61 id=61 data-nosnippet>61</a> <span class="kw">if </span>i &gt; <span class="number">0 </span>&amp;&amp; ch.is_uppercase() {
<a href=#62 id=62 data-nosnippet>62</a> snake.push(<span class="string">'_'</span>);
<a href=#63 id=63 data-nosnippet>63</a> }
<a href=#64 id=64 data-nosnippet>64</a> snake.push(ch.to_ascii_lowercase());
<a href=#65 id=65 data-nosnippet>65</a> }
<a href=#66 id=66 data-nosnippet>66</a> snake
<a href=#67 id=67 data-nosnippet>67</a> }
<a href=#68 id=68 data-nosnippet>68</a> ScreamingSnakeCase =&gt; SnakeCase.apply_to_variant(variant).to_ascii_uppercase(),
<a href=#69 id=69 data-nosnippet>69</a> KebabCase =&gt; SnakeCase.apply_to_variant(variant).replace(<span class="string">'_'</span>, <span class="string">"-"</span>),
<a href=#70 id=70 data-nosnippet>70</a> }
<a href=#71 id=71 data-nosnippet>71</a> }
<a href=#72 id=72 data-nosnippet>72</a>
<a href=#73 id=73 data-nosnippet>73</a> <span class="doccomment">/// Change case of a `snake_case` field.
<a href=#74 id=74 data-nosnippet>74</a> </span><span class="kw">pub fn </span>apply_to_field&lt;S: AsRef&lt;str&gt;&gt;(<span class="kw-2">&amp;</span><span class="self">self</span>, field: S) -&gt; String {
<a href=#75 id=75 data-nosnippet>75</a>
<a href=#76 id=76 data-nosnippet>76</a> <span class="kw">let </span>field = field.as_ref();
<a href=#77 id=77 data-nosnippet>77</a> <span class="kw">match </span><span class="kw-2">*</span><span class="self">self </span>{
<a href=#78 id=78 data-nosnippet>78</a> <span class="prelude-val">None </span>| LowerCase | SnakeCase =&gt; field.to_owned(),
<a href=#79 id=79 data-nosnippet>79</a> PascalCase =&gt; {
<a href=#80 id=80 data-nosnippet>80</a> <span class="kw">let </span><span class="kw-2">mut </span>pascal = String::new();
<a href=#81 id=81 data-nosnippet>81</a> <span class="kw">let </span><span class="kw-2">mut </span>capitalize = <span class="bool-val">true</span>;
<a href=#82 id=82 data-nosnippet>82</a> <span class="kw">for </span>ch <span class="kw">in </span>field.chars() {
<a href=#83 id=83 data-nosnippet>83</a> <span class="kw">if </span>ch == <span class="string">'_' </span>{
<a href=#84 id=84 data-nosnippet>84</a> capitalize = <span class="bool-val">true</span>;
<a href=#85 id=85 data-nosnippet>85</a> } <span class="kw">else if </span>capitalize {
<a href=#86 id=86 data-nosnippet>86</a> pascal.push(ch.to_ascii_uppercase());
<a href=#87 id=87 data-nosnippet>87</a> capitalize = <span class="bool-val">false</span>;
<a href=#88 id=88 data-nosnippet>88</a> } <span class="kw">else </span>{
<a href=#89 id=89 data-nosnippet>89</a> pascal.push(ch);
<a href=#90 id=90 data-nosnippet>90</a> }
<a href=#91 id=91 data-nosnippet>91</a> }
<a href=#92 id=92 data-nosnippet>92</a> pascal
<a href=#93 id=93 data-nosnippet>93</a> }
<a href=#94 id=94 data-nosnippet>94</a> CamelCase =&gt; {
<a href=#95 id=95 data-nosnippet>95</a> <span class="kw">let </span>pascal = PascalCase.apply_to_field(field);
<a href=#96 id=96 data-nosnippet>96</a> pascal[..<span class="number">1</span>].to_ascii_lowercase() + <span class="kw-2">&amp;</span>pascal[<span class="number">1</span>..]
<a href=#97 id=97 data-nosnippet>97</a> }
<a href=#98 id=98 data-nosnippet>98</a> ScreamingSnakeCase =&gt; field.to_ascii_uppercase(),
<a href=#99 id=99 data-nosnippet>99</a> KebabCase =&gt; field.replace(<span class="string">'_'</span>, <span class="string">"-"</span>),
<a href=#100 id=100 data-nosnippet>100</a> }
<a href=#101 id=101 data-nosnippet>101</a> }
<a href=#102 id=102 data-nosnippet>102</a>}
<a href=#103 id=103 data-nosnippet>103</a>
<a href=#104 id=104 data-nosnippet>104</a><span class="kw">impl </span>FromStr <span class="kw">for </span>RenameRule {
<a href=#105 id=105 data-nosnippet>105</a> <span class="kw">type </span><span class="prelude-val">Err </span>= ();
<a href=#106 id=106 data-nosnippet>106</a>
<a href=#107 id=107 data-nosnippet>107</a> <span class="kw">fn </span>from_str(rename_all_str: <span class="kw-2">&amp;</span>str) -&gt; <span class="prelude-ty">Result</span>&lt;<span class="self">Self</span>, <span class="self">Self</span>::Err&gt; {
<a href=#108 id=108 data-nosnippet>108</a> <span class="kw">match </span>rename_all_str {
<a href=#109 id=109 data-nosnippet>109</a> <span class="string">"lowercase" </span>=&gt; <span class="prelude-val">Ok</span>(LowerCase),
<a href=#110 id=110 data-nosnippet>110</a> <span class="string">"PascalCase" </span>=&gt; <span class="prelude-val">Ok</span>(PascalCase),
<a href=#111 id=111 data-nosnippet>111</a> <span class="string">"camelCase" </span>=&gt; <span class="prelude-val">Ok</span>(CamelCase),
<a href=#112 id=112 data-nosnippet>112</a> <span class="string">"snake_case" </span>=&gt; <span class="prelude-val">Ok</span>(SnakeCase),
<a href=#113 id=113 data-nosnippet>113</a> <span class="string">"SCREAMING_SNAKE_CASE" </span>=&gt; <span class="prelude-val">Ok</span>(ScreamingSnakeCase),
<a href=#114 id=114 data-nosnippet>114</a> <span class="string">"kebab-case" </span>=&gt; <span class="prelude-val">Ok</span>(KebabCase),
<a href=#115 id=115 data-nosnippet>115</a> <span class="kw">_ </span>=&gt; <span class="prelude-val">Err</span>(()),
<a href=#116 id=116 data-nosnippet>116</a> }
<a href=#117 id=117 data-nosnippet>117</a> }
<a href=#118 id=118 data-nosnippet>118</a>}
<a href=#119 id=119 data-nosnippet>119</a>
<a href=#120 id=120 data-nosnippet>120</a><span class="kw">impl </span>Default <span class="kw">for </span>RenameRule {
<a href=#121 id=121 data-nosnippet>121</a> <span class="kw">fn </span>default() -&gt; <span class="self">Self </span>{
<a href=#122 id=122 data-nosnippet>122</a> RenameRule::None
<a href=#123 id=123 data-nosnippet>123</a> }
<a href=#124 id=124 data-nosnippet>124</a>}
<a href=#125 id=125 data-nosnippet>125</a>
<a href=#126 id=126 data-nosnippet>126</a><span class="attr">#[cfg(test)]
<a href=#127 id=127 data-nosnippet>127</a></span><span class="kw">mod </span>tests {
<a href=#128 id=128 data-nosnippet>128</a> <span class="kw">use </span><span class="kw">super</span>::RenameRule::<span class="kw-2">*</span>;
<a href=#129 id=129 data-nosnippet>129</a>
<a href=#130 id=130 data-nosnippet>130</a> <span class="attr">#[test]
<a href=#131 id=131 data-nosnippet>131</a> </span><span class="kw">fn </span>rename_variants() {
<a href=#132 id=132 data-nosnippet>132</a> <span class="kw">for </span><span class="kw-2">&amp;</span>(original, lower, camel, snake, screaming, kebab) <span class="kw">in
<a href=#133 id=133 data-nosnippet>133</a> </span><span class="kw-2">&amp;</span>[
<a href=#134 id=134 data-nosnippet>134</a> (<span class="string">"Outcome"</span>, <span class="string">"outcome"</span>, <span class="string">"outcome"</span>, <span class="string">"outcome"</span>, <span class="string">"OUTCOME"</span>, <span class="string">"outcome"</span>),
<a href=#135 id=135 data-nosnippet>135</a> (<span class="string">"VeryTasty"</span>, <span class="string">"verytasty"</span>, <span class="string">"veryTasty"</span>, <span class="string">"very_tasty"</span>, <span class="string">"VERY_TASTY"</span>, <span class="string">"very-tasty"</span>),
<a href=#136 id=136 data-nosnippet>136</a> (<span class="string">"A"</span>, <span class="string">"a"</span>, <span class="string">"a"</span>, <span class="string">"a"</span>, <span class="string">"A"</span>, <span class="string">"a"</span>),
<a href=#137 id=137 data-nosnippet>137</a> (<span class="string">"Z42"</span>, <span class="string">"z42"</span>, <span class="string">"z42"</span>, <span class="string">"z42"</span>, <span class="string">"Z42"</span>, <span class="string">"z42"</span>),
<a href=#138 id=138 data-nosnippet>138</a> ] {
<a href=#139 id=139 data-nosnippet>139</a> <span class="macro">assert_eq!</span>(<span class="prelude-val">None</span>.apply_to_variant(original), original);
<a href=#140 id=140 data-nosnippet>140</a> <span class="macro">assert_eq!</span>(LowerCase.apply_to_variant(original), lower);
<a href=#141 id=141 data-nosnippet>141</a> <span class="macro">assert_eq!</span>(PascalCase.apply_to_variant(original), original);
<a href=#142 id=142 data-nosnippet>142</a> <span class="macro">assert_eq!</span>(CamelCase.apply_to_variant(original), camel);
<a href=#143 id=143 data-nosnippet>143</a> <span class="macro">assert_eq!</span>(SnakeCase.apply_to_variant(original), snake);
<a href=#144 id=144 data-nosnippet>144</a> <span class="macro">assert_eq!</span>(ScreamingSnakeCase.apply_to_variant(original), screaming);
<a href=#145 id=145 data-nosnippet>145</a> <span class="macro">assert_eq!</span>(KebabCase.apply_to_variant(original), kebab);
<a href=#146 id=146 data-nosnippet>146</a> }
<a href=#147 id=147 data-nosnippet>147</a> }
<a href=#148 id=148 data-nosnippet>148</a>
<a href=#149 id=149 data-nosnippet>149</a> <span class="attr">#[test]
<a href=#150 id=150 data-nosnippet>150</a> </span><span class="kw">fn </span>rename_fields() {
<a href=#151 id=151 data-nosnippet>151</a> <span class="kw">for </span><span class="kw-2">&amp;</span>(original, pascal, camel, screaming, kebab) <span class="kw">in
<a href=#152 id=152 data-nosnippet>152</a> </span><span class="kw-2">&amp;</span>[
<a href=#153 id=153 data-nosnippet>153</a> (<span class="string">"outcome"</span>, <span class="string">"Outcome"</span>, <span class="string">"outcome"</span>, <span class="string">"OUTCOME"</span>, <span class="string">"outcome"</span>),
<a href=#154 id=154 data-nosnippet>154</a> (<span class="string">"very_tasty"</span>, <span class="string">"VeryTasty"</span>, <span class="string">"veryTasty"</span>, <span class="string">"VERY_TASTY"</span>, <span class="string">"very-tasty"</span>),
<a href=#155 id=155 data-nosnippet>155</a> (<span class="string">"_leading_under"</span>, <span class="string">"LeadingUnder"</span>, <span class="string">"leadingUnder"</span>, <span class="string">"_LEADING_UNDER"</span>, <span class="string">"-leading-under"</span>),
<a href=#156 id=156 data-nosnippet>156</a> (<span class="string">"double__under"</span>, <span class="string">"DoubleUnder"</span>, <span class="string">"doubleUnder"</span>, <span class="string">"DOUBLE__UNDER"</span>, <span class="string">"double--under"</span>),
<a href=#157 id=157 data-nosnippet>157</a> (<span class="string">"a"</span>, <span class="string">"A"</span>, <span class="string">"a"</span>, <span class="string">"A"</span>, <span class="string">"a"</span>),
<a href=#158 id=158 data-nosnippet>158</a> (<span class="string">"z42"</span>, <span class="string">"Z42"</span>, <span class="string">"z42"</span>, <span class="string">"Z42"</span>, <span class="string">"z42"</span>),
<a href=#159 id=159 data-nosnippet>159</a> ] {
<a href=#160 id=160 data-nosnippet>160</a> <span class="macro">assert_eq!</span>(<span class="prelude-val">None</span>.apply_to_field(original), original);
<a href=#161 id=161 data-nosnippet>161</a> <span class="macro">assert_eq!</span>(PascalCase.apply_to_field(original), pascal);
<a href=#162 id=162 data-nosnippet>162</a> <span class="macro">assert_eq!</span>(CamelCase.apply_to_field(original), camel);
<a href=#163 id=163 data-nosnippet>163</a> <span class="macro">assert_eq!</span>(SnakeCase.apply_to_field(original), original);
<a href=#164 id=164 data-nosnippet>164</a> <span class="macro">assert_eq!</span>(ScreamingSnakeCase.apply_to_field(original), screaming);
<a href=#165 id=165 data-nosnippet>165</a> <span class="macro">assert_eq!</span>(KebabCase.apply_to_field(original), kebab);
<a href=#166 id=166 data-nosnippet>166</a> }
<a href=#167 id=167 data-nosnippet>167</a> }
<a href=#168 id=168 data-nosnippet>168</a>}</code></pre></div></section></main></body></html>