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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="Functions to use with `#[darling(with = "...")]` that control how quoted values in `Meta` instances are parsed into `Expr` fields."><title>darling::util::parse_expr - Rust</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../static.files/SourceSerif4-Regular-46f98efaafac5295.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../static.files/FiraSans-Regular-018c141bf0843ffd.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../static.files/FiraSans-Medium-8f9a781e4970d388.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../static.files/SourceCodePro-Regular-562dcc5011b6de7d.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../static.files/SourceCodePro-Semibold-d899c5a5c4aeb14a.ttf.woff2"><link rel="stylesheet" href="../../../static.files/normalize-76eba96aa4d2e634.css"><link rel="stylesheet" href="../../../static.files/rustdoc-ac92e1bbe349e143.css"><meta name="rustdoc-vars" data-root-path="../../../" data-static-root-path="../../../static.files/" data-current-crate="darling" data-themes="" data-resource-suffix="" data-rustdoc-version="1.76.0 (07dca489a 2024-02-04)" data-channel="1.76.0" data-search-js="search-2b6ce74ff89ae146.js" data-settings-js="settings-4313503d2e1961c2.js" ><script src="../../../static.files/storage-f2adc0d6ca4d09fb.js"></script><script defer src="../sidebar-items.js"></script><script defer src="../../../static.files/main-305769736d49e732.js"></script><noscript><link rel="stylesheet" href="../../../static.files/noscript-feafe1bb7466e4bd.css"></noscript><link rel="alternate icon" type="image/png" href="../../../static.files/favicon-16x16-8b506e7a72182f1c.png"><link rel="alternate icon" type="image/png" href="../../../static.files/favicon-32x32-422f7d1d52889060.png"><link rel="icon" type="image/svg+xml" href="../../../static.files/favicon-2c020d218678b618.svg"></head><body class="rustdoc mod"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="mobile-topbar"><button class="sidebar-menu-toggle">☰</button></nav><nav class="sidebar"><div class="sidebar-crate"><h2><a href="../../../darling/index.html">darling</a><span class="version">0.20.3</span></h2></div><h2 class="location"><a href="#">Module parse_expr</a></h2><div class="sidebar-elems"><section><ul class="block"><li><a href="#functions">Functions</a></li></ul></section><h2><a href="../index.html">In darling::util</a></h2></div></nav><div class="sidebar-resizer"></div>
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<main><div class="width-limiter"><nav class="sub"><form class="search-form"><span></span><div id="sidebar-button" tabindex="-1"><a href="../../../darling/all.html" title="show sidebar"></a></div><input class="search-input" name="search" aria-label="Run search in the documentation" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" tabindex="-1"><a href="../../../help.html" title="help">?</a></div><div id="settings-menu" tabindex="-1"><a href="../../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../../static.files/wheel-7b819b6101059cd0.svg"></a></div></form></nav><section id="main-content" class="content"><div class="main-heading"><h1>Module <a href="../../index.html">darling</a>::<wbr><a href="../index.html">util</a>::<wbr><a class="mod" href="#">parse_expr</a><button id="copy-path" title="Copy item path to clipboard"><img src="../../../static.files/clipboard-7571035ce49a181d.svg" width="19" height="18" alt="Copy item path"></button></h1><span class="out-of-band"><a class="src" href="../../../src/darling_core/util/mod.rs.html#8">source</a> · <button id="toggle-all-docs" title="collapse all docs">[<span>−</span>]</button></span></div><details class="toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>Functions to use with <code>#[darling(with = "...")]</code> that control how quoted values
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in <a href="../../../syn/attr/enum.Meta.html" title="enum syn::attr::Meta"><code>Meta</code></a> instances are parsed into <a href="../../../syn/expr/enum.Expr.html" title="enum syn::expr::Expr"><code>Expr</code></a> fields.</p>
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<p>Version 1 of syn did not permit expressions on the right-hand side of the <code>=</code> in a
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<a href="../../../syn/attr/struct.MetaNameValue.html" title="struct syn::attr::MetaNameValue"><code>MetaNameValue</code></a>, so darling accepted string literals and then
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parsed their contents as expressions.
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Passing a string literal in this version would have required the use of a raw string
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to add quotation marks inside the literal.</p>
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<p>Version 2 of syn removes the requirement that the right-hand side be a literal.
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For most types, such as <a href="../../../syn/path/struct.Path.html" title="struct syn::path::Path"><code>Path</code></a>, the <a href="../../trait.FromMeta.html" title="trait darling::FromMeta"><code>FromMeta</code></a> impl can accept the
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version without quotation marks without causing ambiguity; a path cannot start and
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end with quotation marks, so removal is automatic.</p>
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<p><a href="../../../syn/expr/enum.Expr.html" title="enum syn::expr::Expr"><code>Expr</code></a> is the one type where this ambiguity is new and unavoidable. To address this,
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this module provides different functions for different expected behaviors.</p>
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</div></details><h2 id="functions" class="section-header"><a href="#functions">Functions</a></h2><ul class="item-table"><li><div class="item-name"><a class="fn" href="fn.parse_str_literal.html" title="fn darling::util::parse_expr::parse_str_literal">parse_str_literal</a></div><div class="desc docblock-short">Parse a <a href="../../../syn/attr/enum.Meta.html" title="enum syn::attr::Meta"><code>Meta</code></a> to an <a href="../../../syn/expr/enum.Expr.html" title="enum syn::expr::Expr"><code>Expr</code></a>; if the value is a string literal, the string’s
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contents will be parsed as an expression and emitted.</div></li><li><div class="item-name"><a class="fn" href="fn.preserve_str_literal.html" title="fn darling::util::parse_expr::preserve_str_literal">preserve_str_literal</a></div><div class="desc docblock-short">Parse a <a href="../../../syn/attr/enum.Meta.html" title="enum syn::attr::Meta"><code>Meta</code></a> to an <a href="../../../syn/expr/enum.Expr.html" title="enum syn::expr::Expr"><code>Expr</code></a>; if the value is a string literal, the emitted
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expression will be a string literal.</div></li></ul></section></div></main></body></html> |