| <!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 `/root/.cargo/registry/src/github.com-1ecc6299db9ec823/serde_derive-1.0.163/src/internals/case.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>case.rs - source</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceCodePro-Semibold.ttf.woff2"><link rel="stylesheet" href="../../../normalize.css"><link rel="stylesheet" href="../../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" href="../../../ayu.css" disabled><link rel="stylesheet" href="../../../dark.css" disabled><link rel="stylesheet" href="../../../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../../../storage.js"></script><script defer src="../../../source-script.js"></script><script defer src="../../../source-files.js"></script><script defer src="../../../main.js"></script><noscript><link rel="stylesheet" href="../../../noscript.css"></noscript><link rel="alternate icon" type="image/png" href="../../../favicon-16x16.png"><link rel="alternate icon" type="image/png" href="../../../favicon-32x32.png"><link rel="icon" type="image/svg+xml" href="../../../favicon.svg"></head><body class="rustdoc source"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><a class="sidebar-logo" href="../../../serde_derive/index.html"><div class="logo-container"><img class="rust-logo" src="../../../rust-logo.svg" alt="logo"></div></a></nav><main><div class="width-limiter"><nav class="sub"><a class="sub-logo-container" href="../../../serde_derive/index.html"><img class="rust-logo" src="../../../rust-logo.svg" alt="logo"></a><form class="search-form"><div class="search-container"><span></span><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" title="help" tabindex="-1"><a href="../../../help.html">?</a></div><div id="settings-menu" tabindex="-1"><a href="../../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../../wheel.svg"></a></div></div></form></nav><section id="main-content" class="content"><div class="example-wrap"><pre class="src-line-numbers"><span id="1">1</span> |
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| </pre><pre class="rust"><code><span class="doccomment">//! Code to convert the Rust-styled field/variant (e.g. `my_field`, `MyType`) to the |
| //! case of the source (e.g. `my-field`, `MY_FIELD`). |
| |
| </span><span class="comment">// See https://users.rust-lang.org/t/psa-dealing-with-warning-unused-import-std-ascii-asciiext-in-today-s-nightly/13726 |
| </span><span class="attribute">#[allow(deprecated, unused_imports)] |
| </span><span class="kw">use </span>std::ascii::AsciiExt; |
| |
| <span class="kw">use </span>std::fmt::{<span class="self">self</span>, Debug, Display}; |
| |
| <span class="kw">use </span><span class="self">self</span>::RenameRule::<span class="kw-2">*</span>; |
| |
| <span class="doccomment">/// The different possible ways to change case of fields in a struct, or variants in an enum. |
| </span><span class="attribute">#[derive(Copy, Clone, PartialEq)] |
| </span><span class="kw">pub enum </span>RenameRule { |
| <span class="doccomment">/// Don't apply a default rename rule. |
| </span><span class="prelude-val">None</span>, |
| <span class="doccomment">/// Rename direct children to "lowercase" style. |
| </span>LowerCase, |
| <span class="doccomment">/// Rename direct children to "UPPERCASE" style. |
| </span>UpperCase, |
| <span class="doccomment">/// Rename direct children to "PascalCase" style, as typically used for |
| /// enum variants. |
| </span>PascalCase, |
| <span class="doccomment">/// Rename direct children to "camelCase" style. |
| </span>CamelCase, |
| <span class="doccomment">/// Rename direct children to "snake_case" style, as commonly used for |
| /// fields. |
| </span>SnakeCase, |
| <span class="doccomment">/// Rename direct children to "SCREAMING_SNAKE_CASE" style, as commonly |
| /// used for constants. |
| </span>ScreamingSnakeCase, |
| <span class="doccomment">/// Rename direct children to "kebab-case" style. |
| </span>KebabCase, |
| <span class="doccomment">/// Rename direct children to "SCREAMING-KEBAB-CASE" style. |
| </span>ScreamingKebabCase, |
| } |
| |
| <span class="kw">static </span>RENAME_RULES: <span class="kw-2">&</span>[(<span class="kw-2">&</span>str, RenameRule)] = <span class="kw-2">&</span>[ |
| (<span class="string">"lowercase"</span>, LowerCase), |
| (<span class="string">"UPPERCASE"</span>, UpperCase), |
| (<span class="string">"PascalCase"</span>, PascalCase), |
| (<span class="string">"camelCase"</span>, CamelCase), |
| (<span class="string">"snake_case"</span>, SnakeCase), |
| (<span class="string">"SCREAMING_SNAKE_CASE"</span>, ScreamingSnakeCase), |
| (<span class="string">"kebab-case"</span>, KebabCase), |
| (<span class="string">"SCREAMING-KEBAB-CASE"</span>, ScreamingKebabCase), |
| ]; |
| |
| <span class="kw">impl </span>RenameRule { |
| <span class="kw">pub fn </span>from_str(rename_all_str: <span class="kw-2">&</span>str) -> <span class="prelude-ty">Result</span><<span class="self">Self</span>, ParseError> { |
| <span class="kw">for </span>(name, rule) <span class="kw">in </span>RENAME_RULES { |
| <span class="kw">if </span>rename_all_str == <span class="kw-2">*</span>name { |
| <span class="kw">return </span><span class="prelude-val">Ok</span>(<span class="kw-2">*</span>rule); |
| } |
| } |
| <span class="prelude-val">Err</span>(ParseError { |
| unknown: rename_all_str, |
| }) |
| } |
| |
| <span class="doccomment">/// Apply a renaming rule to an enum variant, returning the version expected in the source. |
| </span><span class="kw">pub fn </span>apply_to_variant(<span class="kw-2">&</span><span class="self">self</span>, variant: <span class="kw-2">&</span>str) -> String { |
| <span class="kw">match </span><span class="kw-2">*</span><span class="self">self </span>{ |
| <span class="prelude-val">None </span>| PascalCase => variant.to_owned(), |
| LowerCase => variant.to_ascii_lowercase(), |
| UpperCase => variant.to_ascii_uppercase(), |
| CamelCase => variant[..<span class="number">1</span>].to_ascii_lowercase() + <span class="kw-2">&</span>variant[<span class="number">1</span>..], |
| SnakeCase => { |
| <span class="kw">let </span><span class="kw-2">mut </span>snake = String::new(); |
| <span class="kw">for </span>(i, ch) <span class="kw">in </span>variant.char_indices() { |
| <span class="kw">if </span>i > <span class="number">0 </span>&& ch.is_uppercase() { |
| snake.push(<span class="string">'_'</span>); |
| } |
| snake.push(ch.to_ascii_lowercase()); |
| } |
| snake |
| } |
| ScreamingSnakeCase => SnakeCase.apply_to_variant(variant).to_ascii_uppercase(), |
| KebabCase => SnakeCase.apply_to_variant(variant).replace(<span class="string">'_'</span>, <span class="string">"-"</span>), |
| ScreamingKebabCase => ScreamingSnakeCase |
| .apply_to_variant(variant) |
| .replace(<span class="string">'_'</span>, <span class="string">"-"</span>), |
| } |
| } |
| |
| <span class="doccomment">/// Apply a renaming rule to a struct field, returning the version expected in the source. |
| </span><span class="kw">pub fn </span>apply_to_field(<span class="kw-2">&</span><span class="self">self</span>, field: <span class="kw-2">&</span>str) -> String { |
| <span class="kw">match </span><span class="kw-2">*</span><span class="self">self </span>{ |
| <span class="prelude-val">None </span>| LowerCase | SnakeCase => field.to_owned(), |
| UpperCase => field.to_ascii_uppercase(), |
| PascalCase => { |
| <span class="kw">let </span><span class="kw-2">mut </span>pascal = String::new(); |
| <span class="kw">let </span><span class="kw-2">mut </span>capitalize = <span class="bool-val">true</span>; |
| <span class="kw">for </span>ch <span class="kw">in </span>field.chars() { |
| <span class="kw">if </span>ch == <span class="string">'_' </span>{ |
| capitalize = <span class="bool-val">true</span>; |
| } <span class="kw">else if </span>capitalize { |
| pascal.push(ch.to_ascii_uppercase()); |
| capitalize = <span class="bool-val">false</span>; |
| } <span class="kw">else </span>{ |
| pascal.push(ch); |
| } |
| } |
| pascal |
| } |
| CamelCase => { |
| <span class="kw">let </span>pascal = PascalCase.apply_to_field(field); |
| pascal[..<span class="number">1</span>].to_ascii_lowercase() + <span class="kw-2">&</span>pascal[<span class="number">1</span>..] |
| } |
| ScreamingSnakeCase => field.to_ascii_uppercase(), |
| KebabCase => field.replace(<span class="string">'_'</span>, <span class="string">"-"</span>), |
| ScreamingKebabCase => ScreamingSnakeCase.apply_to_field(field).replace(<span class="string">'_'</span>, <span class="string">"-"</span>), |
| } |
| } |
| } |
| |
| <span class="kw">pub struct </span>ParseError<<span class="lifetime">'a</span>> { |
| unknown: <span class="kw-2">&</span><span class="lifetime">'a </span>str, |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>> Display <span class="kw">for </span>ParseError<<span class="lifetime">'a</span>> { |
| <span class="kw">fn </span>fmt(<span class="kw-2">&</span><span class="self">self</span>, f: <span class="kw-2">&mut </span>fmt::Formatter) -> fmt::Result { |
| f.write_str(<span class="string">"unknown rename rule `rename_all = "</span>)<span class="question-mark">?</span>; |
| Debug::fmt(<span class="self">self</span>.unknown, f)<span class="question-mark">?</span>; |
| f.write_str(<span class="string">"`, expected one of "</span>)<span class="question-mark">?</span>; |
| <span class="kw">for </span>(i, (name, _rule)) <span class="kw">in </span>RENAME_RULES.iter().enumerate() { |
| <span class="kw">if </span>i > <span class="number">0 </span>{ |
| f.write_str(<span class="string">", "</span>)<span class="question-mark">?</span>; |
| } |
| Debug::fmt(name, f)<span class="question-mark">?</span>; |
| } |
| <span class="prelude-val">Ok</span>(()) |
| } |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>rename_variants() { |
| <span class="kw">for </span><span class="kw-2">&</span>(original, lower, upper, camel, snake, screaming, kebab, screaming_kebab) <span class="kw">in </span><span class="kw-2">&</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>, <span class="string">"OUTCOME"</span>, <span class="string">"outcome"</span>, <span class="string">"OUTCOME"</span>, |
| ), |
| ( |
| <span class="string">"VeryTasty"</span>, |
| <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>, |
| <span class="string">"VERY-TASTY"</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>, <span class="string">"A"</span>, <span class="string">"a"</span>, <span class="string">"A"</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>, <span class="string">"Z42"</span>, <span class="string">"z42"</span>, <span class="string">"Z42"</span>), |
| ] { |
| <span class="macro">assert_eq!</span>(<span class="prelude-val">None</span>.apply_to_variant(original), original); |
| <span class="macro">assert_eq!</span>(LowerCase.apply_to_variant(original), lower); |
| <span class="macro">assert_eq!</span>(UpperCase.apply_to_variant(original), upper); |
| <span class="macro">assert_eq!</span>(PascalCase.apply_to_variant(original), original); |
| <span class="macro">assert_eq!</span>(CamelCase.apply_to_variant(original), camel); |
| <span class="macro">assert_eq!</span>(SnakeCase.apply_to_variant(original), snake); |
| <span class="macro">assert_eq!</span>(ScreamingSnakeCase.apply_to_variant(original), screaming); |
| <span class="macro">assert_eq!</span>(KebabCase.apply_to_variant(original), kebab); |
| <span class="macro">assert_eq!</span>( |
| ScreamingKebabCase.apply_to_variant(original), |
| screaming_kebab |
| ); |
| } |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>rename_fields() { |
| <span class="kw">for </span><span class="kw-2">&</span>(original, upper, pascal, camel, screaming, kebab, screaming_kebab) <span class="kw">in </span><span class="kw-2">&</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>, <span class="string">"outcome"</span>, <span class="string">"OUTCOME"</span>, |
| ), |
| ( |
| <span class="string">"very_tasty"</span>, |
| <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>, |
| <span class="string">"VERY-TASTY"</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>, <span class="string">"a"</span>, <span class="string">"A"</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>, <span class="string">"z42"</span>, <span class="string">"Z42"</span>), |
| ] { |
| <span class="macro">assert_eq!</span>(<span class="prelude-val">None</span>.apply_to_field(original), original); |
| <span class="macro">assert_eq!</span>(UpperCase.apply_to_field(original), upper); |
| <span class="macro">assert_eq!</span>(PascalCase.apply_to_field(original), pascal); |
| <span class="macro">assert_eq!</span>(CamelCase.apply_to_field(original), camel); |
| <span class="macro">assert_eq!</span>(SnakeCase.apply_to_field(original), original); |
| <span class="macro">assert_eq!</span>(ScreamingSnakeCase.apply_to_field(original), screaming); |
| <span class="macro">assert_eq!</span>(KebabCase.apply_to_field(original), kebab); |
| <span class="macro">assert_eq!</span>(ScreamingKebabCase.apply_to_field(original), screaming_kebab); |
| } |
| } |
| </code></pre></div> |
| </section></div></main><div id="rustdoc-vars" data-root-path="../../../" data-current-crate="serde_derive" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |
