| <!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/attr.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>attr.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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| <span id="1587">1587</span> |
| <span id="1588">1588</span> |
| <span id="1589">1589</span> |
| <span id="1590">1590</span> |
| <span id="1591">1591</span> |
| <span id="1592">1592</span> |
| <span id="1593">1593</span> |
| <span id="1594">1594</span> |
| <span id="1595">1595</span> |
| <span id="1596">1596</span> |
| <span id="1597">1597</span> |
| <span id="1598">1598</span> |
| <span id="1599">1599</span> |
| <span id="1600">1600</span> |
| <span id="1601">1601</span> |
| <span id="1602">1602</span> |
| <span id="1603">1603</span> |
| <span id="1604">1604</span> |
| <span id="1605">1605</span> |
| <span id="1606">1606</span> |
| <span id="1607">1607</span> |
| <span id="1608">1608</span> |
| <span id="1609">1609</span> |
| <span id="1610">1610</span> |
| <span id="1611">1611</span> |
| <span id="1612">1612</span> |
| <span id="1613">1613</span> |
| <span id="1614">1614</span> |
| <span id="1615">1615</span> |
| <span id="1616">1616</span> |
| <span id="1617">1617</span> |
| <span id="1618">1618</span> |
| <span id="1619">1619</span> |
| <span id="1620">1620</span> |
| <span id="1621">1621</span> |
| <span id="1622">1622</span> |
| <span id="1623">1623</span> |
| <span id="1624">1624</span> |
| <span id="1625">1625</span> |
| <span id="1626">1626</span> |
| <span id="1627">1627</span> |
| <span id="1628">1628</span> |
| <span id="1629">1629</span> |
| <span id="1630">1630</span> |
| <span id="1631">1631</span> |
| <span id="1632">1632</span> |
| <span id="1633">1633</span> |
| <span id="1634">1634</span> |
| <span id="1635">1635</span> |
| <span id="1636">1636</span> |
| <span id="1637">1637</span> |
| <span id="1638">1638</span> |
| <span id="1639">1639</span> |
| <span id="1640">1640</span> |
| <span id="1641">1641</span> |
| <span id="1642">1642</span> |
| <span id="1643">1643</span> |
| <span id="1644">1644</span> |
| <span id="1645">1645</span> |
| <span id="1646">1646</span> |
| <span id="1647">1647</span> |
| <span id="1648">1648</span> |
| <span id="1649">1649</span> |
| <span id="1650">1650</span> |
| <span id="1651">1651</span> |
| <span id="1652">1652</span> |
| <span id="1653">1653</span> |
| <span id="1654">1654</span> |
| <span id="1655">1655</span> |
| <span id="1656">1656</span> |
| <span id="1657">1657</span> |
| <span id="1658">1658</span> |
| <span id="1659">1659</span> |
| <span id="1660">1660</span> |
| <span id="1661">1661</span> |
| <span id="1662">1662</span> |
| <span id="1663">1663</span> |
| <span id="1664">1664</span> |
| <span id="1665">1665</span> |
| <span id="1666">1666</span> |
| <span id="1667">1667</span> |
| <span id="1668">1668</span> |
| <span id="1669">1669</span> |
| <span id="1670">1670</span> |
| <span id="1671">1671</span> |
| <span id="1672">1672</span> |
| <span id="1673">1673</span> |
| <span id="1674">1674</span> |
| <span id="1675">1675</span> |
| <span id="1676">1676</span> |
| <span id="1677">1677</span> |
| <span id="1678">1678</span> |
| <span id="1679">1679</span> |
| <span id="1680">1680</span> |
| <span id="1681">1681</span> |
| <span id="1682">1682</span> |
| <span id="1683">1683</span> |
| <span id="1684">1684</span> |
| <span id="1685">1685</span> |
| <span id="1686">1686</span> |
| <span id="1687">1687</span> |
| <span id="1688">1688</span> |
| <span id="1689">1689</span> |
| <span id="1690">1690</span> |
| <span id="1691">1691</span> |
| <span id="1692">1692</span> |
| <span id="1693">1693</span> |
| <span id="1694">1694</span> |
| <span id="1695">1695</span> |
| <span id="1696">1696</span> |
| <span id="1697">1697</span> |
| <span id="1698">1698</span> |
| <span id="1699">1699</span> |
| <span id="1700">1700</span> |
| <span id="1701">1701</span> |
| <span id="1702">1702</span> |
| <span id="1703">1703</span> |
| <span id="1704">1704</span> |
| <span id="1705">1705</span> |
| <span id="1706">1706</span> |
| <span id="1707">1707</span> |
| <span id="1708">1708</span> |
| <span id="1709">1709</span> |
| <span id="1710">1710</span> |
| <span id="1711">1711</span> |
| <span id="1712">1712</span> |
| <span id="1713">1713</span> |
| <span id="1714">1714</span> |
| <span id="1715">1715</span> |
| <span id="1716">1716</span> |
| <span id="1717">1717</span> |
| <span id="1718">1718</span> |
| <span id="1719">1719</span> |
| <span id="1720">1720</span> |
| <span id="1721">1721</span> |
| <span id="1722">1722</span> |
| <span id="1723">1723</span> |
| <span id="1724">1724</span> |
| <span id="1725">1725</span> |
| <span id="1726">1726</span> |
| <span id="1727">1727</span> |
| <span id="1728">1728</span> |
| <span id="1729">1729</span> |
| <span id="1730">1730</span> |
| <span id="1731">1731</span> |
| <span id="1732">1732</span> |
| <span id="1733">1733</span> |
| <span id="1734">1734</span> |
| <span id="1735">1735</span> |
| <span id="1736">1736</span> |
| <span id="1737">1737</span> |
| <span id="1738">1738</span> |
| <span id="1739">1739</span> |
| <span id="1740">1740</span> |
| <span id="1741">1741</span> |
| <span id="1742">1742</span> |
| <span id="1743">1743</span> |
| <span id="1744">1744</span> |
| <span id="1745">1745</span> |
| <span id="1746">1746</span> |
| <span id="1747">1747</span> |
| <span id="1748">1748</span> |
| <span id="1749">1749</span> |
| <span id="1750">1750</span> |
| <span id="1751">1751</span> |
| <span id="1752">1752</span> |
| <span id="1753">1753</span> |
| <span id="1754">1754</span> |
| <span id="1755">1755</span> |
| <span id="1756">1756</span> |
| <span id="1757">1757</span> |
| <span id="1758">1758</span> |
| <span id="1759">1759</span> |
| <span id="1760">1760</span> |
| <span id="1761">1761</span> |
| <span id="1762">1762</span> |
| <span id="1763">1763</span> |
| <span id="1764">1764</span> |
| <span id="1765">1765</span> |
| <span id="1766">1766</span> |
| <span id="1767">1767</span> |
| <span id="1768">1768</span> |
| <span id="1769">1769</span> |
| <span id="1770">1770</span> |
| <span id="1771">1771</span> |
| <span id="1772">1772</span> |
| <span id="1773">1773</span> |
| <span id="1774">1774</span> |
| <span id="1775">1775</span> |
| <span id="1776">1776</span> |
| <span id="1777">1777</span> |
| <span id="1778">1778</span> |
| <span id="1779">1779</span> |
| <span id="1780">1780</span> |
| <span id="1781">1781</span> |
| <span id="1782">1782</span> |
| <span id="1783">1783</span> |
| <span id="1784">1784</span> |
| <span id="1785">1785</span> |
| <span id="1786">1786</span> |
| <span id="1787">1787</span> |
| <span id="1788">1788</span> |
| <span id="1789">1789</span> |
| <span id="1790">1790</span> |
| <span id="1791">1791</span> |
| <span id="1792">1792</span> |
| <span id="1793">1793</span> |
| <span id="1794">1794</span> |
| <span id="1795">1795</span> |
| <span id="1796">1796</span> |
| </pre><pre class="rust"><code><span class="kw">use </span>internals::symbol::<span class="kw-2">*</span>; |
| <span class="kw">use </span>internals::{ungroup, Ctxt}; |
| <span class="kw">use </span>proc_macro2::{Spacing, Span, TokenStream, TokenTree}; |
| <span class="kw">use </span>quote::ToTokens; |
| <span class="kw">use </span>std::borrow::Cow; |
| <span class="kw">use </span>std::collections::BTreeSet; |
| <span class="kw">use </span>std::iter::FromIterator; |
| <span class="kw">use </span>syn; |
| <span class="kw">use </span>syn::meta::ParseNestedMeta; |
| <span class="kw">use </span>syn::parse::ParseStream; |
| <span class="kw">use </span>syn::punctuated::Punctuated; |
| <span class="kw">use </span>syn::{token, Ident, Lifetime}; |
| |
| <span class="comment">// This module handles parsing of `#[serde(...)]` attributes. The entrypoints |
| // are `attr::Container::from_ast`, `attr::Variant::from_ast`, and |
| // `attr::Field::from_ast`. Each returns an instance of the corresponding |
| // struct. Note that none of them return a Result. Unrecognized, malformed, or |
| // duplicated attributes result in a span_err but otherwise are ignored. The |
| // user will see errors simultaneously for all bad attributes in the crate |
| // rather than just the first. |
| |
| </span><span class="kw">pub use </span>internals::case::RenameRule; |
| |
| <span class="kw">struct </span>Attr<<span class="lifetime">'c</span>, T> { |
| cx: <span class="kw-2">&</span><span class="lifetime">'c </span>Ctxt, |
| name: Symbol, |
| tokens: TokenStream, |
| value: <span class="prelude-ty">Option</span><T>, |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'c</span>, T> Attr<<span class="lifetime">'c</span>, T> { |
| <span class="kw">fn </span>none(cx: <span class="kw-2">&</span><span class="lifetime">'c </span>Ctxt, name: Symbol) -> <span class="self">Self </span>{ |
| Attr { |
| cx, |
| name, |
| tokens: TokenStream::new(), |
| value: <span class="prelude-val">None</span>, |
| } |
| } |
| |
| <span class="kw">fn </span>set<A: ToTokens>(<span class="kw-2">&mut </span><span class="self">self</span>, obj: A, value: T) { |
| <span class="kw">let </span>tokens = obj.into_token_stream(); |
| |
| <span class="kw">if </span><span class="self">self</span>.value.is_some() { |
| <span class="kw">let </span>msg = <span class="macro">format!</span>(<span class="string">"duplicate serde attribute `{}`"</span>, <span class="self">self</span>.name); |
| <span class="self">self</span>.cx.error_spanned_by(tokens, msg); |
| } <span class="kw">else </span>{ |
| <span class="self">self</span>.tokens = tokens; |
| <span class="self">self</span>.value = <span class="prelude-val">Some</span>(value); |
| } |
| } |
| |
| <span class="kw">fn </span>set_opt<A: ToTokens>(<span class="kw-2">&mut </span><span class="self">self</span>, obj: A, value: <span class="prelude-ty">Option</span><T>) { |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(value) = value { |
| <span class="self">self</span>.set(obj, value); |
| } |
| } |
| |
| <span class="kw">fn </span>set_if_none(<span class="kw-2">&mut </span><span class="self">self</span>, value: T) { |
| <span class="kw">if </span><span class="self">self</span>.value.is_none() { |
| <span class="self">self</span>.value = <span class="prelude-val">Some</span>(value); |
| } |
| } |
| |
| <span class="kw">fn </span>get(<span class="self">self</span>) -> <span class="prelude-ty">Option</span><T> { |
| <span class="self">self</span>.value |
| } |
| |
| <span class="kw">fn </span>get_with_tokens(<span class="self">self</span>) -> <span class="prelude-ty">Option</span><(TokenStream, T)> { |
| <span class="kw">match </span><span class="self">self</span>.value { |
| <span class="prelude-val">Some</span>(v) => <span class="prelude-val">Some</span>((<span class="self">self</span>.tokens, v)), |
| <span class="prelude-val">None </span>=> <span class="prelude-val">None</span>, |
| } |
| } |
| } |
| |
| <span class="kw">struct </span>BoolAttr<<span class="lifetime">'c</span>>(Attr<<span class="lifetime">'c</span>, ()>); |
| |
| <span class="kw">impl</span><<span class="lifetime">'c</span>> BoolAttr<<span class="lifetime">'c</span>> { |
| <span class="kw">fn </span>none(cx: <span class="kw-2">&</span><span class="lifetime">'c </span>Ctxt, name: Symbol) -> <span class="self">Self </span>{ |
| BoolAttr(Attr::none(cx, name)) |
| } |
| |
| <span class="kw">fn </span>set_true<A: ToTokens>(<span class="kw-2">&mut </span><span class="self">self</span>, obj: A) { |
| <span class="self">self</span>.<span class="number">0</span>.set(obj, ()); |
| } |
| |
| <span class="kw">fn </span>get(<span class="kw-2">&</span><span class="self">self</span>) -> bool { |
| <span class="self">self</span>.<span class="number">0</span>.value.is_some() |
| } |
| } |
| |
| <span class="kw">struct </span>VecAttr<<span class="lifetime">'c</span>, T> { |
| cx: <span class="kw-2">&</span><span class="lifetime">'c </span>Ctxt, |
| name: Symbol, |
| first_dup_tokens: TokenStream, |
| values: Vec<T>, |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'c</span>, T> VecAttr<<span class="lifetime">'c</span>, T> { |
| <span class="kw">fn </span>none(cx: <span class="kw-2">&</span><span class="lifetime">'c </span>Ctxt, name: Symbol) -> <span class="self">Self </span>{ |
| VecAttr { |
| cx, |
| name, |
| first_dup_tokens: TokenStream::new(), |
| values: Vec::new(), |
| } |
| } |
| |
| <span class="kw">fn </span>insert<A: ToTokens>(<span class="kw-2">&mut </span><span class="self">self</span>, obj: A, value: T) { |
| <span class="kw">if </span><span class="self">self</span>.values.len() == <span class="number">1 </span>{ |
| <span class="self">self</span>.first_dup_tokens = obj.into_token_stream(); |
| } |
| <span class="self">self</span>.values.push(value); |
| } |
| |
| <span class="kw">fn </span>at_most_one(<span class="kw-2">mut </span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><T> { |
| <span class="kw">if </span><span class="self">self</span>.values.len() > <span class="number">1 </span>{ |
| <span class="kw">let </span>dup_token = <span class="self">self</span>.first_dup_tokens; |
| <span class="kw">let </span>msg = <span class="macro">format!</span>(<span class="string">"duplicate serde attribute `{}`"</span>, <span class="self">self</span>.name); |
| <span class="self">self</span>.cx.error_spanned_by(dup_token, msg); |
| <span class="prelude-val">None |
| </span>} <span class="kw">else </span>{ |
| <span class="self">self</span>.values.pop() |
| } |
| } |
| |
| <span class="kw">fn </span>get(<span class="self">self</span>) -> Vec<T> { |
| <span class="self">self</span>.values |
| } |
| } |
| |
| <span class="kw">pub struct </span>Name { |
| serialize: String, |
| serialize_renamed: bool, |
| deserialize: String, |
| deserialize_renamed: bool, |
| deserialize_aliases: Vec<String>, |
| } |
| |
| <span class="kw">fn </span>unraw(ident: <span class="kw-2">&</span>Ident) -> String { |
| ident.to_string().trim_start_matches(<span class="string">"r#"</span>).to_owned() |
| } |
| |
| <span class="kw">impl </span>Name { |
| <span class="kw">fn </span>from_attrs( |
| source_name: String, |
| ser_name: Attr<String>, |
| de_name: Attr<String>, |
| de_aliases: <span class="prelude-ty">Option</span><VecAttr<String>>, |
| ) -> Name { |
| <span class="kw">let </span>deserialize_aliases = <span class="kw">match </span>de_aliases { |
| <span class="prelude-val">Some</span>(de_aliases) => { |
| <span class="kw">let </span><span class="kw-2">mut </span>alias_list = BTreeSet::new(); |
| <span class="kw">for </span>alias_name <span class="kw">in </span>de_aliases.get() { |
| alias_list.insert(alias_name); |
| } |
| alias_list.into_iter().collect() |
| } |
| <span class="prelude-val">None </span>=> Vec::new(), |
| }; |
| |
| <span class="kw">let </span>ser_name = ser_name.get(); |
| <span class="kw">let </span>ser_renamed = ser_name.is_some(); |
| <span class="kw">let </span>de_name = de_name.get(); |
| <span class="kw">let </span>de_renamed = de_name.is_some(); |
| Name { |
| serialize: ser_name.unwrap_or_else(|| source_name.clone()), |
| serialize_renamed: ser_renamed, |
| deserialize: de_name.unwrap_or(source_name), |
| deserialize_renamed: de_renamed, |
| deserialize_aliases, |
| } |
| } |
| |
| <span class="doccomment">/// Return the container name for the container when serializing. |
| </span><span class="kw">pub fn </span>serialize_name(<span class="kw-2">&</span><span class="self">self</span>) -> String { |
| <span class="self">self</span>.serialize.clone() |
| } |
| |
| <span class="doccomment">/// Return the container name for the container when deserializing. |
| </span><span class="kw">pub fn </span>deserialize_name(<span class="kw-2">&</span><span class="self">self</span>) -> String { |
| <span class="self">self</span>.deserialize.clone() |
| } |
| |
| <span class="kw">fn </span>deserialize_aliases(<span class="kw-2">&</span><span class="self">self</span>) -> Vec<String> { |
| <span class="kw">let </span><span class="kw-2">mut </span>aliases = <span class="self">self</span>.deserialize_aliases.clone(); |
| <span class="kw">let </span>main_name = <span class="self">self</span>.deserialize_name(); |
| <span class="kw">if </span>!aliases.contains(<span class="kw-2">&</span>main_name) { |
| aliases.push(main_name); |
| } |
| aliases |
| } |
| } |
| |
| <span class="kw">pub struct </span>RenameAllRules { |
| serialize: RenameRule, |
| deserialize: RenameRule, |
| } |
| |
| <span class="doccomment">/// Represents struct or enum attribute information. |
| </span><span class="kw">pub struct </span>Container { |
| name: Name, |
| transparent: bool, |
| deny_unknown_fields: bool, |
| default: Default, |
| rename_all_rules: RenameAllRules, |
| ser_bound: <span class="prelude-ty">Option</span><Vec<syn::WherePredicate>>, |
| de_bound: <span class="prelude-ty">Option</span><Vec<syn::WherePredicate>>, |
| tag: TagType, |
| type_from: <span class="prelude-ty">Option</span><syn::Type>, |
| type_try_from: <span class="prelude-ty">Option</span><syn::Type>, |
| type_into: <span class="prelude-ty">Option</span><syn::Type>, |
| remote: <span class="prelude-ty">Option</span><syn::Path>, |
| identifier: Identifier, |
| has_flatten: bool, |
| serde_path: <span class="prelude-ty">Option</span><syn::Path>, |
| is_packed: bool, |
| <span class="doccomment">/// Error message generated when type can't be deserialized |
| </span>expecting: <span class="prelude-ty">Option</span><String>, |
| } |
| |
| <span class="doccomment">/// Styles of representing an enum. |
| </span><span class="kw">pub enum </span>TagType { |
| <span class="doccomment">/// The default. |
| /// |
| /// ```json |
| /// {"variant1": {"key1": "value1", "key2": "value2"}} |
| /// ``` |
| </span>External, |
| |
| <span class="doccomment">/// `#[serde(tag = "type")]` |
| /// |
| /// ```json |
| /// {"type": "variant1", "key1": "value1", "key2": "value2"} |
| /// ``` |
| </span>Internal { tag: String }, |
| |
| <span class="doccomment">/// `#[serde(tag = "t", content = "c")]` |
| /// |
| /// ```json |
| /// {"t": "variant1", "c": {"key1": "value1", "key2": "value2"}} |
| /// ``` |
| </span>Adjacent { tag: String, content: String }, |
| |
| <span class="doccomment">/// `#[serde(untagged)]` |
| /// |
| /// ```json |
| /// {"key1": "value1", "key2": "value2"} |
| /// ``` |
| </span><span class="prelude-val">None</span>, |
| } |
| |
| <span class="doccomment">/// Whether this enum represents the fields of a struct or the variants of an |
| /// enum. |
| </span><span class="attribute">#[derive(Copy, Clone)] |
| </span><span class="kw">pub enum </span>Identifier { |
| <span class="doccomment">/// It does not. |
| </span>No, |
| |
| <span class="doccomment">/// This enum represents the fields of a struct. All of the variants must be |
| /// unit variants, except possibly one which is annotated with |
| /// `#[serde(other)]` and is a newtype variant. |
| </span>Field, |
| |
| <span class="doccomment">/// This enum represents the variants of an enum. All of the variants must |
| /// be unit variants. |
| </span>Variant, |
| } |
| |
| <span class="kw">impl </span>Identifier { |
| <span class="attribute">#[cfg(feature = <span class="string">"deserialize_in_place"</span>)] |
| </span><span class="kw">pub fn </span>is_some(<span class="self">self</span>) -> bool { |
| <span class="kw">match </span><span class="self">self </span>{ |
| Identifier::No => <span class="bool-val">false</span>, |
| Identifier::Field | Identifier::Variant => <span class="bool-val">true</span>, |
| } |
| } |
| } |
| |
| <span class="kw">impl </span>Container { |
| <span class="doccomment">/// Extract out the `#[serde(...)]` attributes from an item. |
| </span><span class="kw">pub fn </span>from_ast(cx: <span class="kw-2">&</span>Ctxt, item: <span class="kw-2">&</span>syn::DeriveInput) -> <span class="self">Self </span>{ |
| <span class="kw">let </span><span class="kw-2">mut </span>ser_name = Attr::none(cx, RENAME); |
| <span class="kw">let </span><span class="kw-2">mut </span>de_name = Attr::none(cx, RENAME); |
| <span class="kw">let </span><span class="kw-2">mut </span>transparent = BoolAttr::none(cx, TRANSPARENT); |
| <span class="kw">let </span><span class="kw-2">mut </span>deny_unknown_fields = BoolAttr::none(cx, DENY_UNKNOWN_FIELDS); |
| <span class="kw">let </span><span class="kw-2">mut </span>default = Attr::none(cx, DEFAULT); |
| <span class="kw">let </span><span class="kw-2">mut </span>rename_all_ser_rule = Attr::none(cx, RENAME_ALL); |
| <span class="kw">let </span><span class="kw-2">mut </span>rename_all_de_rule = Attr::none(cx, RENAME_ALL); |
| <span class="kw">let </span><span class="kw-2">mut </span>ser_bound = Attr::none(cx, BOUND); |
| <span class="kw">let </span><span class="kw-2">mut </span>de_bound = Attr::none(cx, BOUND); |
| <span class="kw">let </span><span class="kw-2">mut </span>untagged = BoolAttr::none(cx, UNTAGGED); |
| <span class="kw">let </span><span class="kw-2">mut </span>internal_tag = Attr::none(cx, TAG); |
| <span class="kw">let </span><span class="kw-2">mut </span>content = Attr::none(cx, CONTENT); |
| <span class="kw">let </span><span class="kw-2">mut </span>type_from = Attr::none(cx, FROM); |
| <span class="kw">let </span><span class="kw-2">mut </span>type_try_from = Attr::none(cx, TRY_FROM); |
| <span class="kw">let </span><span class="kw-2">mut </span>type_into = Attr::none(cx, INTO); |
| <span class="kw">let </span><span class="kw-2">mut </span>remote = Attr::none(cx, REMOTE); |
| <span class="kw">let </span><span class="kw-2">mut </span>field_identifier = BoolAttr::none(cx, FIELD_IDENTIFIER); |
| <span class="kw">let </span><span class="kw-2">mut </span>variant_identifier = BoolAttr::none(cx, VARIANT_IDENTIFIER); |
| <span class="kw">let </span><span class="kw-2">mut </span>serde_path = Attr::none(cx, CRATE); |
| <span class="kw">let </span><span class="kw-2">mut </span>expecting = Attr::none(cx, EXPECTING); |
| |
| <span class="kw">for </span>attr <span class="kw">in </span><span class="kw-2">&</span>item.attrs { |
| <span class="kw">if </span>attr.path() != SERDE { |
| <span class="kw">continue</span>; |
| } |
| |
| <span class="kw">if let </span>syn::Meta::List(meta) = <span class="kw-2">&</span>attr.meta { |
| <span class="kw">if </span>meta.tokens.is_empty() { |
| <span class="kw">continue</span>; |
| } |
| } |
| |
| <span class="kw">if let </span><span class="prelude-val">Err</span>(err) = attr.parse_nested_meta(|meta| { |
| <span class="kw">if </span>meta.path == RENAME { |
| <span class="comment">// #[serde(rename = "foo")] |
| // #[serde(rename(serialize = "foo", deserialize = "bar"))] |
| </span><span class="kw">let </span>(ser, de) = get_renames(cx, RENAME, <span class="kw-2">&</span>meta)<span class="question-mark">?</span>; |
| ser_name.set_opt(<span class="kw-2">&</span>meta.path, ser.as_ref().map(syn::LitStr::value)); |
| de_name.set_opt(<span class="kw-2">&</span>meta.path, de.as_ref().map(syn::LitStr::value)); |
| } <span class="kw">else if </span>meta.path == RENAME_ALL { |
| <span class="comment">// #[serde(rename_all = "foo")] |
| // #[serde(rename_all(serialize = "foo", deserialize = "bar"))] |
| </span><span class="kw">let </span>one_name = meta.input.peek(<span class="macro">Token!</span>[=]); |
| <span class="kw">let </span>(ser, de) = get_renames(cx, RENAME_ALL, <span class="kw-2">&</span>meta)<span class="question-mark">?</span>; |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(ser) = ser { |
| <span class="kw">match </span>RenameRule::from_str(<span class="kw-2">&</span>ser.value()) { |
| <span class="prelude-val">Ok</span>(rename_rule) => rename_all_ser_rule.set(<span class="kw-2">&</span>meta.path, rename_rule), |
| <span class="prelude-val">Err</span>(err) => cx.error_spanned_by(ser, err), |
| } |
| } |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(de) = de { |
| <span class="kw">match </span>RenameRule::from_str(<span class="kw-2">&</span>de.value()) { |
| <span class="prelude-val">Ok</span>(rename_rule) => rename_all_de_rule.set(<span class="kw-2">&</span>meta.path, rename_rule), |
| <span class="prelude-val">Err</span>(err) => { |
| <span class="kw">if </span>!one_name { |
| cx.error_spanned_by(de, err); |
| } |
| } |
| } |
| } |
| } <span class="kw">else if </span>meta.path == TRANSPARENT { |
| <span class="comment">// #[serde(transparent)] |
| </span>transparent.set_true(meta.path); |
| } <span class="kw">else if </span>meta.path == DENY_UNKNOWN_FIELDS { |
| <span class="comment">// #[serde(deny_unknown_fields)] |
| </span>deny_unknown_fields.set_true(meta.path); |
| } <span class="kw">else if </span>meta.path == DEFAULT { |
| <span class="kw">if </span>meta.input.peek(<span class="macro">Token!</span>[=]) { |
| <span class="comment">// #[serde(default = "...")] |
| </span><span class="kw">if let </span><span class="prelude-val">Some</span>(path) = parse_lit_into_expr_path(cx, DEFAULT, <span class="kw-2">&</span>meta)<span class="question-mark">? </span>{ |
| <span class="kw">match </span><span class="kw-2">&</span>item.data { |
| syn::Data::Struct(syn::DataStruct { fields, .. }) => <span class="kw">match </span>fields { |
| syn::Fields::Named(<span class="kw">_</span>) => { |
| default.set(<span class="kw-2">&</span>meta.path, Default::Path(path)); |
| } |
| syn::Fields::Unnamed(<span class="kw">_</span>) | syn::Fields::Unit => { |
| <span class="kw">let </span>msg = <span class="string">"#[serde(default = \"...\")] can only be used on structs with named fields"</span>; |
| cx.error_spanned_by(fields, msg); |
| } |
| }, |
| syn::Data::Enum(syn::DataEnum { enum_token, .. }) => { |
| <span class="kw">let </span>msg = <span class="string">"#[serde(default = \"...\")] can only be used on structs with named fields"</span>; |
| cx.error_spanned_by(enum_token, msg); |
| } |
| syn::Data::Union(syn::DataUnion { union_token, .. }) => { |
| <span class="kw">let </span>msg = <span class="string">"#[serde(default = \"...\")] can only be used on structs with named fields"</span>; |
| cx.error_spanned_by(union_token, msg); |
| } |
| } |
| } |
| } <span class="kw">else </span>{ |
| <span class="comment">// #[serde(default)] |
| </span><span class="kw">match </span><span class="kw-2">&</span>item.data { |
| syn::Data::Struct(syn::DataStruct { fields, .. }) => <span class="kw">match </span>fields { |
| syn::Fields::Named(<span class="kw">_</span>) => { |
| default.set(meta.path, Default::Default); |
| } |
| syn::Fields::Unnamed(<span class="kw">_</span>) | syn::Fields::Unit => { |
| <span class="kw">let </span>msg = <span class="string">"#[serde(default)] can only be used on structs with named fields"</span>; |
| cx.error_spanned_by(fields, msg); |
| } |
| }, |
| syn::Data::Enum(syn::DataEnum { enum_token, .. }) => { |
| <span class="kw">let </span>msg = <span class="string">"#[serde(default)] can only be used on structs with named fields"</span>; |
| cx.error_spanned_by(enum_token, msg); |
| } |
| syn::Data::Union(syn::DataUnion { union_token, .. }) => { |
| <span class="kw">let </span>msg = <span class="string">"#[serde(default)] can only be used on structs with named fields"</span>; |
| cx.error_spanned_by(union_token, msg); |
| } |
| } |
| } |
| } <span class="kw">else if </span>meta.path == BOUND { |
| <span class="comment">// #[serde(bound = "T: SomeBound")] |
| // #[serde(bound(serialize = "...", deserialize = "..."))] |
| </span><span class="kw">let </span>(ser, de) = get_where_predicates(cx, <span class="kw-2">&</span>meta)<span class="question-mark">?</span>; |
| ser_bound.set_opt(<span class="kw-2">&</span>meta.path, ser); |
| de_bound.set_opt(<span class="kw-2">&</span>meta.path, de); |
| } <span class="kw">else if </span>meta.path == UNTAGGED { |
| <span class="comment">// #[serde(untagged)] |
| </span><span class="kw">match </span>item.data { |
| syn::Data::Enum(<span class="kw">_</span>) => { |
| untagged.set_true(<span class="kw-2">&</span>meta.path); |
| } |
| syn::Data::Struct(syn::DataStruct { struct_token, .. }) => { |
| <span class="kw">let </span>msg = <span class="string">"#[serde(untagged)] can only be used on enums"</span>; |
| cx.error_spanned_by(struct_token, msg); |
| } |
| syn::Data::Union(syn::DataUnion { union_token, .. }) => { |
| <span class="kw">let </span>msg = <span class="string">"#[serde(untagged)] can only be used on enums"</span>; |
| cx.error_spanned_by(union_token, msg); |
| } |
| } |
| } <span class="kw">else if </span>meta.path == TAG { |
| <span class="comment">// #[serde(tag = "type")] |
| </span><span class="kw">if let </span><span class="prelude-val">Some</span>(s) = get_lit_str(cx, TAG, <span class="kw-2">&</span>meta)<span class="question-mark">? </span>{ |
| <span class="kw">match </span><span class="kw-2">&</span>item.data { |
| syn::Data::Enum(<span class="kw">_</span>) => { |
| internal_tag.set(<span class="kw-2">&</span>meta.path, s.value()); |
| } |
| syn::Data::Struct(syn::DataStruct { fields, .. }) => <span class="kw">match </span>fields { |
| syn::Fields::Named(<span class="kw">_</span>) => { |
| internal_tag.set(<span class="kw-2">&</span>meta.path, s.value()); |
| } |
| syn::Fields::Unnamed(<span class="kw">_</span>) | syn::Fields::Unit => { |
| <span class="kw">let </span>msg = <span class="string">"#[serde(tag = \"...\")] can only be used on enums and structs with named fields"</span>; |
| cx.error_spanned_by(fields, msg); |
| } |
| }, |
| syn::Data::Union(syn::DataUnion { union_token, .. }) => { |
| <span class="kw">let </span>msg = <span class="string">"#[serde(tag = \"...\")] can only be used on enums and structs with named fields"</span>; |
| cx.error_spanned_by(union_token, msg); |
| } |
| } |
| } |
| } <span class="kw">else if </span>meta.path == CONTENT { |
| <span class="comment">// #[serde(content = "c")] |
| </span><span class="kw">if let </span><span class="prelude-val">Some</span>(s) = get_lit_str(cx, CONTENT, <span class="kw-2">&</span>meta)<span class="question-mark">? </span>{ |
| <span class="kw">match </span><span class="kw-2">&</span>item.data { |
| syn::Data::Enum(<span class="kw">_</span>) => { |
| content.set(<span class="kw-2">&</span>meta.path, s.value()); |
| } |
| syn::Data::Struct(syn::DataStruct { struct_token, .. }) => { |
| <span class="kw">let </span>msg = <span class="string">"#[serde(content = \"...\")] can only be used on enums"</span>; |
| cx.error_spanned_by(struct_token, msg); |
| } |
| syn::Data::Union(syn::DataUnion { union_token, .. }) => { |
| <span class="kw">let </span>msg = <span class="string">"#[serde(content = \"...\")] can only be used on enums"</span>; |
| cx.error_spanned_by(union_token, msg); |
| } |
| } |
| } |
| } <span class="kw">else if </span>meta.path == FROM { |
| <span class="comment">// #[serde(from = "Type")] |
| </span><span class="kw">if let </span><span class="prelude-val">Some</span>(from_ty) = parse_lit_into_ty(cx, FROM, <span class="kw-2">&</span>meta)<span class="question-mark">? </span>{ |
| type_from.set_opt(<span class="kw-2">&</span>meta.path, <span class="prelude-val">Some</span>(from_ty)); |
| } |
| } <span class="kw">else if </span>meta.path == TRY_FROM { |
| <span class="comment">// #[serde(try_from = "Type")] |
| </span><span class="kw">if let </span><span class="prelude-val">Some</span>(try_from_ty) = parse_lit_into_ty(cx, TRY_FROM, <span class="kw-2">&</span>meta)<span class="question-mark">? </span>{ |
| type_try_from.set_opt(<span class="kw-2">&</span>meta.path, <span class="prelude-val">Some</span>(try_from_ty)); |
| } |
| } <span class="kw">else if </span>meta.path == INTO { |
| <span class="comment">// #[serde(into = "Type")] |
| </span><span class="kw">if let </span><span class="prelude-val">Some</span>(into_ty) = parse_lit_into_ty(cx, INTO, <span class="kw-2">&</span>meta)<span class="question-mark">? </span>{ |
| type_into.set_opt(<span class="kw-2">&</span>meta.path, <span class="prelude-val">Some</span>(into_ty)); |
| } |
| } <span class="kw">else if </span>meta.path == REMOTE { |
| <span class="comment">// #[serde(remote = "...")] |
| </span><span class="kw">if let </span><span class="prelude-val">Some</span>(path) = parse_lit_into_path(cx, REMOTE, <span class="kw-2">&</span>meta)<span class="question-mark">? </span>{ |
| <span class="kw">if </span>is_primitive_path(<span class="kw-2">&</span>path, <span class="string">"Self"</span>) { |
| remote.set(<span class="kw-2">&</span>meta.path, item.ident.clone().into()); |
| } <span class="kw">else </span>{ |
| remote.set(<span class="kw-2">&</span>meta.path, path); |
| } |
| } |
| } <span class="kw">else if </span>meta.path == FIELD_IDENTIFIER { |
| <span class="comment">// #[serde(field_identifier)] |
| </span>field_identifier.set_true(<span class="kw-2">&</span>meta.path); |
| } <span class="kw">else if </span>meta.path == VARIANT_IDENTIFIER { |
| <span class="comment">// #[serde(variant_identifier)] |
| </span>variant_identifier.set_true(<span class="kw-2">&</span>meta.path); |
| } <span class="kw">else if </span>meta.path == CRATE { |
| <span class="comment">// #[serde(crate = "foo")] |
| </span><span class="kw">if let </span><span class="prelude-val">Some</span>(path) = parse_lit_into_path(cx, CRATE, <span class="kw-2">&</span>meta)<span class="question-mark">? </span>{ |
| serde_path.set(<span class="kw-2">&</span>meta.path, path); |
| } |
| } <span class="kw">else if </span>meta.path == EXPECTING { |
| <span class="comment">// #[serde(expecting = "a message")] |
| </span><span class="kw">if let </span><span class="prelude-val">Some</span>(s) = get_lit_str(cx, EXPECTING, <span class="kw-2">&</span>meta)<span class="question-mark">? </span>{ |
| expecting.set(<span class="kw-2">&</span>meta.path, s.value()); |
| } |
| } <span class="kw">else </span>{ |
| <span class="kw">let </span>path = meta.path.to_token_stream().to_string().replace(<span class="string">' '</span>, <span class="string">""</span>); |
| <span class="kw">return </span><span class="prelude-val">Err</span>( |
| meta.error(<span class="macro">format_args!</span>(<span class="string">"unknown serde container attribute `{}`"</span>, path)) |
| ); |
| } |
| <span class="prelude-val">Ok</span>(()) |
| }) { |
| cx.syn_error(err); |
| } |
| } |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>is_packed = <span class="bool-val">false</span>; |
| <span class="kw">for </span>attr <span class="kw">in </span><span class="kw-2">&</span>item.attrs { |
| <span class="kw">if </span>attr.path() == REPR { |
| <span class="kw">let _ </span>= attr.parse_args_with(|input: ParseStream| { |
| <span class="kw">while let </span><span class="prelude-val">Some</span>(token) = input.parse()<span class="question-mark">? </span>{ |
| <span class="kw">if let </span>TokenTree::Ident(ident) = token { |
| is_packed |= ident == <span class="string">"packed"</span>; |
| } |
| } |
| <span class="prelude-val">Ok</span>(()) |
| }); |
| } |
| } |
| |
| Container { |
| name: Name::from_attrs(unraw(<span class="kw-2">&</span>item.ident), ser_name, de_name, <span class="prelude-val">None</span>), |
| transparent: transparent.get(), |
| deny_unknown_fields: deny_unknown_fields.get(), |
| default: default.get().unwrap_or(Default::None), |
| rename_all_rules: RenameAllRules { |
| serialize: rename_all_ser_rule.get().unwrap_or(RenameRule::None), |
| deserialize: rename_all_de_rule.get().unwrap_or(RenameRule::None), |
| }, |
| ser_bound: ser_bound.get(), |
| de_bound: de_bound.get(), |
| tag: decide_tag(cx, item, untagged, internal_tag, content), |
| type_from: type_from.get(), |
| type_try_from: type_try_from.get(), |
| type_into: type_into.get(), |
| remote: remote.get(), |
| identifier: decide_identifier(cx, item, field_identifier, variant_identifier), |
| has_flatten: <span class="bool-val">false</span>, |
| serde_path: serde_path.get(), |
| is_packed, |
| expecting: expecting.get(), |
| } |
| } |
| |
| <span class="kw">pub fn </span>name(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span>Name { |
| <span class="kw-2">&</span><span class="self">self</span>.name |
| } |
| |
| <span class="kw">pub fn </span>rename_all_rules(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span>RenameAllRules { |
| <span class="kw-2">&</span><span class="self">self</span>.rename_all_rules |
| } |
| |
| <span class="kw">pub fn </span>transparent(<span class="kw-2">&</span><span class="self">self</span>) -> bool { |
| <span class="self">self</span>.transparent |
| } |
| |
| <span class="kw">pub fn </span>deny_unknown_fields(<span class="kw-2">&</span><span class="self">self</span>) -> bool { |
| <span class="self">self</span>.deny_unknown_fields |
| } |
| |
| <span class="kw">pub fn </span>default(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span>Default { |
| <span class="kw-2">&</span><span class="self">self</span>.default |
| } |
| |
| <span class="kw">pub fn </span>ser_bound(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><<span class="kw-2">&</span>[syn::WherePredicate]> { |
| <span class="self">self</span>.ser_bound.as_ref().map(|vec| <span class="kw-2">&</span>vec[..]) |
| } |
| |
| <span class="kw">pub fn </span>de_bound(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><<span class="kw-2">&</span>[syn::WherePredicate]> { |
| <span class="self">self</span>.de_bound.as_ref().map(|vec| <span class="kw-2">&</span>vec[..]) |
| } |
| |
| <span class="kw">pub fn </span>tag(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span>TagType { |
| <span class="kw-2">&</span><span class="self">self</span>.tag |
| } |
| |
| <span class="kw">pub fn </span>type_from(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><<span class="kw-2">&</span>syn::Type> { |
| <span class="self">self</span>.type_from.as_ref() |
| } |
| |
| <span class="kw">pub fn </span>type_try_from(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><<span class="kw-2">&</span>syn::Type> { |
| <span class="self">self</span>.type_try_from.as_ref() |
| } |
| |
| <span class="kw">pub fn </span>type_into(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><<span class="kw-2">&</span>syn::Type> { |
| <span class="self">self</span>.type_into.as_ref() |
| } |
| |
| <span class="kw">pub fn </span>remote(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><<span class="kw-2">&</span>syn::Path> { |
| <span class="self">self</span>.remote.as_ref() |
| } |
| |
| <span class="kw">pub fn </span>is_packed(<span class="kw-2">&</span><span class="self">self</span>) -> bool { |
| <span class="self">self</span>.is_packed |
| } |
| |
| <span class="kw">pub fn </span>identifier(<span class="kw-2">&</span><span class="self">self</span>) -> Identifier { |
| <span class="self">self</span>.identifier |
| } |
| |
| <span class="kw">pub fn </span>has_flatten(<span class="kw-2">&</span><span class="self">self</span>) -> bool { |
| <span class="self">self</span>.has_flatten |
| } |
| |
| <span class="kw">pub fn </span>mark_has_flatten(<span class="kw-2">&mut </span><span class="self">self</span>) { |
| <span class="self">self</span>.has_flatten = <span class="bool-val">true</span>; |
| } |
| |
| <span class="kw">pub fn </span>custom_serde_path(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><<span class="kw-2">&</span>syn::Path> { |
| <span class="self">self</span>.serde_path.as_ref() |
| } |
| |
| <span class="kw">pub fn </span>serde_path(<span class="kw-2">&</span><span class="self">self</span>) -> Cow<syn::Path> { |
| <span class="self">self</span>.custom_serde_path() |
| .map_or_else(|| Cow::Owned(<span class="macro">parse_quote!</span>(_serde)), Cow::Borrowed) |
| } |
| |
| <span class="doccomment">/// Error message generated when type can't be deserialized. |
| /// If `None`, default message will be used |
| </span><span class="kw">pub fn </span>expecting(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><<span class="kw-2">&</span>str> { |
| <span class="self">self</span>.expecting.as_ref().map(String::as_ref) |
| } |
| } |
| |
| <span class="kw">fn </span>decide_tag( |
| cx: <span class="kw-2">&</span>Ctxt, |
| item: <span class="kw-2">&</span>syn::DeriveInput, |
| untagged: BoolAttr, |
| internal_tag: Attr<String>, |
| content: Attr<String>, |
| ) -> TagType { |
| <span class="kw">match </span>( |
| untagged.<span class="number">0</span>.get_with_tokens(), |
| internal_tag.get_with_tokens(), |
| content.get_with_tokens(), |
| ) { |
| (<span class="prelude-val">None</span>, <span class="prelude-val">None</span>, <span class="prelude-val">None</span>) => TagType::External, |
| (<span class="prelude-val">Some</span>(<span class="kw">_</span>), <span class="prelude-val">None</span>, <span class="prelude-val">None</span>) => TagType::None, |
| (<span class="prelude-val">None</span>, <span class="prelude-val">Some</span>((<span class="kw">_</span>, tag)), <span class="prelude-val">None</span>) => { |
| <span class="comment">// Check that there are no tuple variants. |
| </span><span class="kw">if let </span>syn::Data::Enum(data) = <span class="kw-2">&</span>item.data { |
| <span class="kw">for </span>variant <span class="kw">in </span><span class="kw-2">&</span>data.variants { |
| <span class="kw">match </span><span class="kw-2">&</span>variant.fields { |
| syn::Fields::Named(<span class="kw">_</span>) | syn::Fields::Unit => {} |
| syn::Fields::Unnamed(fields) => { |
| <span class="kw">if </span>fields.unnamed.len() != <span class="number">1 </span>{ |
| <span class="kw">let </span>msg = |
| <span class="string">"#[serde(tag = \"...\")] cannot be used with tuple variants"</span>; |
| cx.error_spanned_by(variant, msg); |
| <span class="kw">break</span>; |
| } |
| } |
| } |
| } |
| } |
| TagType::Internal { tag } |
| } |
| (<span class="prelude-val">Some</span>((untagged_tokens, <span class="kw">_</span>)), <span class="prelude-val">Some</span>((tag_tokens, <span class="kw">_</span>)), <span class="prelude-val">None</span>) => { |
| <span class="kw">let </span>msg = <span class="string">"enum cannot be both untagged and internally tagged"</span>; |
| cx.error_spanned_by(untagged_tokens, msg); |
| cx.error_spanned_by(tag_tokens, msg); |
| TagType::External <span class="comment">// doesn't matter, will error |
| </span>} |
| (<span class="prelude-val">None</span>, <span class="prelude-val">None</span>, <span class="prelude-val">Some</span>((content_tokens, <span class="kw">_</span>))) => { |
| <span class="kw">let </span>msg = <span class="string">"#[serde(tag = \"...\", content = \"...\")] must be used together"</span>; |
| cx.error_spanned_by(content_tokens, msg); |
| TagType::External |
| } |
| (<span class="prelude-val">Some</span>((untagged_tokens, <span class="kw">_</span>)), <span class="prelude-val">None</span>, <span class="prelude-val">Some</span>((content_tokens, <span class="kw">_</span>))) => { |
| <span class="kw">let </span>msg = <span class="string">"untagged enum cannot have #[serde(content = \"...\")]"</span>; |
| cx.error_spanned_by(untagged_tokens, msg); |
| cx.error_spanned_by(content_tokens, msg); |
| TagType::External |
| } |
| (<span class="prelude-val">None</span>, <span class="prelude-val">Some</span>((<span class="kw">_</span>, tag)), <span class="prelude-val">Some</span>((<span class="kw">_</span>, content))) => TagType::Adjacent { tag, content }, |
| (<span class="prelude-val">Some</span>((untagged_tokens, <span class="kw">_</span>)), <span class="prelude-val">Some</span>((tag_tokens, <span class="kw">_</span>)), <span class="prelude-val">Some</span>((content_tokens, <span class="kw">_</span>))) => { |
| <span class="kw">let </span>msg = <span class="string">"untagged enum cannot have #[serde(tag = \"...\", content = \"...\")]"</span>; |
| cx.error_spanned_by(untagged_tokens, msg); |
| cx.error_spanned_by(tag_tokens, msg); |
| cx.error_spanned_by(content_tokens, msg); |
| TagType::External |
| } |
| } |
| } |
| |
| <span class="kw">fn </span>decide_identifier( |
| cx: <span class="kw-2">&</span>Ctxt, |
| item: <span class="kw-2">&</span>syn::DeriveInput, |
| field_identifier: BoolAttr, |
| variant_identifier: BoolAttr, |
| ) -> Identifier { |
| <span class="kw">match </span>( |
| <span class="kw-2">&</span>item.data, |
| field_identifier.<span class="number">0</span>.get_with_tokens(), |
| variant_identifier.<span class="number">0</span>.get_with_tokens(), |
| ) { |
| (<span class="kw">_</span>, <span class="prelude-val">None</span>, <span class="prelude-val">None</span>) => Identifier::No, |
| (<span class="kw">_</span>, <span class="prelude-val">Some</span>((field_identifier_tokens, <span class="kw">_</span>)), <span class="prelude-val">Some</span>((variant_identifier_tokens, <span class="kw">_</span>))) => { |
| <span class="kw">let </span>msg = |
| <span class="string">"#[serde(field_identifier)] and #[serde(variant_identifier)] cannot both be set"</span>; |
| cx.error_spanned_by(field_identifier_tokens, msg); |
| cx.error_spanned_by(variant_identifier_tokens, msg); |
| Identifier::No |
| } |
| (syn::Data::Enum(<span class="kw">_</span>), <span class="prelude-val">Some</span>(<span class="kw">_</span>), <span class="prelude-val">None</span>) => Identifier::Field, |
| (syn::Data::Enum(<span class="kw">_</span>), <span class="prelude-val">None</span>, <span class="prelude-val">Some</span>(<span class="kw">_</span>)) => Identifier::Variant, |
| (syn::Data::Struct(syn::DataStruct { struct_token, .. }), <span class="prelude-val">Some</span>(<span class="kw">_</span>), <span class="prelude-val">None</span>) => { |
| <span class="kw">let </span>msg = <span class="string">"#[serde(field_identifier)] can only be used on an enum"</span>; |
| cx.error_spanned_by(struct_token, msg); |
| Identifier::No |
| } |
| (syn::Data::Union(syn::DataUnion { union_token, .. }), <span class="prelude-val">Some</span>(<span class="kw">_</span>), <span class="prelude-val">None</span>) => { |
| <span class="kw">let </span>msg = <span class="string">"#[serde(field_identifier)] can only be used on an enum"</span>; |
| cx.error_spanned_by(union_token, msg); |
| Identifier::No |
| } |
| (syn::Data::Struct(syn::DataStruct { struct_token, .. }), <span class="prelude-val">None</span>, <span class="prelude-val">Some</span>(<span class="kw">_</span>)) => { |
| <span class="kw">let </span>msg = <span class="string">"#[serde(variant_identifier)] can only be used on an enum"</span>; |
| cx.error_spanned_by(struct_token, msg); |
| Identifier::No |
| } |
| (syn::Data::Union(syn::DataUnion { union_token, .. }), <span class="prelude-val">None</span>, <span class="prelude-val">Some</span>(<span class="kw">_</span>)) => { |
| <span class="kw">let </span>msg = <span class="string">"#[serde(variant_identifier)] can only be used on an enum"</span>; |
| cx.error_spanned_by(union_token, msg); |
| Identifier::No |
| } |
| } |
| } |
| |
| <span class="doccomment">/// Represents variant attribute information |
| </span><span class="kw">pub struct </span>Variant { |
| name: Name, |
| rename_all_rules: RenameAllRules, |
| ser_bound: <span class="prelude-ty">Option</span><Vec<syn::WherePredicate>>, |
| de_bound: <span class="prelude-ty">Option</span><Vec<syn::WherePredicate>>, |
| skip_deserializing: bool, |
| skip_serializing: bool, |
| other: bool, |
| serialize_with: <span class="prelude-ty">Option</span><syn::ExprPath>, |
| deserialize_with: <span class="prelude-ty">Option</span><syn::ExprPath>, |
| borrow: <span class="prelude-ty">Option</span><BorrowAttribute>, |
| } |
| |
| <span class="kw">struct </span>BorrowAttribute { |
| path: syn::Path, |
| lifetimes: <span class="prelude-ty">Option</span><BTreeSet<syn::Lifetime>>, |
| } |
| |
| <span class="kw">impl </span>Variant { |
| <span class="kw">pub fn </span>from_ast(cx: <span class="kw-2">&</span>Ctxt, variant: <span class="kw-2">&</span>syn::Variant) -> <span class="self">Self </span>{ |
| <span class="kw">let </span><span class="kw-2">mut </span>ser_name = Attr::none(cx, RENAME); |
| <span class="kw">let </span><span class="kw-2">mut </span>de_name = Attr::none(cx, RENAME); |
| <span class="kw">let </span><span class="kw-2">mut </span>de_aliases = VecAttr::none(cx, RENAME); |
| <span class="kw">let </span><span class="kw-2">mut </span>skip_deserializing = BoolAttr::none(cx, SKIP_DESERIALIZING); |
| <span class="kw">let </span><span class="kw-2">mut </span>skip_serializing = BoolAttr::none(cx, SKIP_SERIALIZING); |
| <span class="kw">let </span><span class="kw-2">mut </span>rename_all_ser_rule = Attr::none(cx, RENAME_ALL); |
| <span class="kw">let </span><span class="kw-2">mut </span>rename_all_de_rule = Attr::none(cx, RENAME_ALL); |
| <span class="kw">let </span><span class="kw-2">mut </span>ser_bound = Attr::none(cx, BOUND); |
| <span class="kw">let </span><span class="kw-2">mut </span>de_bound = Attr::none(cx, BOUND); |
| <span class="kw">let </span><span class="kw-2">mut </span>other = BoolAttr::none(cx, OTHER); |
| <span class="kw">let </span><span class="kw-2">mut </span>serialize_with = Attr::none(cx, SERIALIZE_WITH); |
| <span class="kw">let </span><span class="kw-2">mut </span>deserialize_with = Attr::none(cx, DESERIALIZE_WITH); |
| <span class="kw">let </span><span class="kw-2">mut </span>borrow = Attr::none(cx, BORROW); |
| |
| <span class="kw">for </span>attr <span class="kw">in </span><span class="kw-2">&</span>variant.attrs { |
| <span class="kw">if </span>attr.path() != SERDE { |
| <span class="kw">continue</span>; |
| } |
| |
| <span class="kw">if let </span>syn::Meta::List(meta) = <span class="kw-2">&</span>attr.meta { |
| <span class="kw">if </span>meta.tokens.is_empty() { |
| <span class="kw">continue</span>; |
| } |
| } |
| |
| <span class="kw">if let </span><span class="prelude-val">Err</span>(err) = attr.parse_nested_meta(|meta| { |
| <span class="kw">if </span>meta.path == RENAME { |
| <span class="comment">// #[serde(rename = "foo")] |
| // #[serde(rename(serialize = "foo", deserialize = "bar"))] |
| </span><span class="kw">let </span>(ser, de) = get_multiple_renames(cx, <span class="kw-2">&</span>meta)<span class="question-mark">?</span>; |
| ser_name.set_opt(<span class="kw-2">&</span>meta.path, ser.as_ref().map(syn::LitStr::value)); |
| <span class="kw">for </span>de_value <span class="kw">in </span>de { |
| de_name.set_if_none(de_value.value()); |
| de_aliases.insert(<span class="kw-2">&</span>meta.path, de_value.value()); |
| } |
| } <span class="kw">else if </span>meta.path == ALIAS { |
| <span class="comment">// #[serde(alias = "foo")] |
| </span><span class="kw">if let </span><span class="prelude-val">Some</span>(s) = get_lit_str(cx, ALIAS, <span class="kw-2">&</span>meta)<span class="question-mark">? </span>{ |
| de_aliases.insert(<span class="kw-2">&</span>meta.path, s.value()); |
| } |
| } <span class="kw">else if </span>meta.path == RENAME_ALL { |
| <span class="comment">// #[serde(rename_all = "foo")] |
| // #[serde(rename_all(serialize = "foo", deserialize = "bar"))] |
| </span><span class="kw">let </span>one_name = meta.input.peek(<span class="macro">Token!</span>[=]); |
| <span class="kw">let </span>(ser, de) = get_renames(cx, RENAME_ALL, <span class="kw-2">&</span>meta)<span class="question-mark">?</span>; |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(ser) = ser { |
| <span class="kw">match </span>RenameRule::from_str(<span class="kw-2">&</span>ser.value()) { |
| <span class="prelude-val">Ok</span>(rename_rule) => rename_all_ser_rule.set(<span class="kw-2">&</span>meta.path, rename_rule), |
| <span class="prelude-val">Err</span>(err) => cx.error_spanned_by(ser, err), |
| } |
| } |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(de) = de { |
| <span class="kw">match </span>RenameRule::from_str(<span class="kw-2">&</span>de.value()) { |
| <span class="prelude-val">Ok</span>(rename_rule) => rename_all_de_rule.set(<span class="kw-2">&</span>meta.path, rename_rule), |
| <span class="prelude-val">Err</span>(err) => { |
| <span class="kw">if </span>!one_name { |
| cx.error_spanned_by(de, err); |
| } |
| } |
| } |
| } |
| } <span class="kw">else if </span>meta.path == SKIP { |
| <span class="comment">// #[serde(skip)] |
| </span>skip_serializing.set_true(<span class="kw-2">&</span>meta.path); |
| skip_deserializing.set_true(<span class="kw-2">&</span>meta.path); |
| } <span class="kw">else if </span>meta.path == SKIP_DESERIALIZING { |
| <span class="comment">// #[serde(skip_deserializing)] |
| </span>skip_deserializing.set_true(<span class="kw-2">&</span>meta.path); |
| } <span class="kw">else if </span>meta.path == SKIP_SERIALIZING { |
| <span class="comment">// #[serde(skip_serializing)] |
| </span>skip_serializing.set_true(<span class="kw-2">&</span>meta.path); |
| } <span class="kw">else if </span>meta.path == OTHER { |
| <span class="comment">// #[serde(other)] |
| </span>other.set_true(<span class="kw-2">&</span>meta.path); |
| } <span class="kw">else if </span>meta.path == BOUND { |
| <span class="comment">// #[serde(bound = "T: SomeBound")] |
| // #[serde(bound(serialize = "...", deserialize = "..."))] |
| </span><span class="kw">let </span>(ser, de) = get_where_predicates(cx, <span class="kw-2">&</span>meta)<span class="question-mark">?</span>; |
| ser_bound.set_opt(<span class="kw-2">&</span>meta.path, ser); |
| de_bound.set_opt(<span class="kw-2">&</span>meta.path, de); |
| } <span class="kw">else if </span>meta.path == WITH { |
| <span class="comment">// #[serde(with = "...")] |
| </span><span class="kw">if let </span><span class="prelude-val">Some</span>(path) = parse_lit_into_expr_path(cx, WITH, <span class="kw-2">&</span>meta)<span class="question-mark">? </span>{ |
| <span class="kw">let </span><span class="kw-2">mut </span>ser_path = path.clone(); |
| ser_path |
| .path |
| .segments |
| .push(Ident::new(<span class="string">"serialize"</span>, Span::call_site()).into()); |
| serialize_with.set(<span class="kw-2">&</span>meta.path, ser_path); |
| <span class="kw">let </span><span class="kw-2">mut </span>de_path = path; |
| de_path |
| .path |
| .segments |
| .push(Ident::new(<span class="string">"deserialize"</span>, Span::call_site()).into()); |
| deserialize_with.set(<span class="kw-2">&</span>meta.path, de_path); |
| } |
| } <span class="kw">else if </span>meta.path == SERIALIZE_WITH { |
| <span class="comment">// #[serde(serialize_with = "...")] |
| </span><span class="kw">if let </span><span class="prelude-val">Some</span>(path) = parse_lit_into_expr_path(cx, SERIALIZE_WITH, <span class="kw-2">&</span>meta)<span class="question-mark">? </span>{ |
| serialize_with.set(<span class="kw-2">&</span>meta.path, path); |
| } |
| } <span class="kw">else if </span>meta.path == DESERIALIZE_WITH { |
| <span class="comment">// #[serde(deserialize_with = "...")] |
| </span><span class="kw">if let </span><span class="prelude-val">Some</span>(path) = parse_lit_into_expr_path(cx, DESERIALIZE_WITH, <span class="kw-2">&</span>meta)<span class="question-mark">? </span>{ |
| deserialize_with.set(<span class="kw-2">&</span>meta.path, path); |
| } |
| } <span class="kw">else if </span>meta.path == BORROW { |
| <span class="kw">let </span>borrow_attribute = <span class="kw">if </span>meta.input.peek(<span class="macro">Token!</span>[=]) { |
| <span class="comment">// #[serde(borrow = "'a + 'b")] |
| </span><span class="kw">let </span>lifetimes = parse_lit_into_lifetimes(cx, <span class="kw-2">&</span>meta)<span class="question-mark">?</span>; |
| BorrowAttribute { |
| path: meta.path.clone(), |
| lifetimes: <span class="prelude-val">Some</span>(lifetimes), |
| } |
| } <span class="kw">else </span>{ |
| <span class="comment">// #[serde(borrow)] |
| </span>BorrowAttribute { |
| path: meta.path.clone(), |
| lifetimes: <span class="prelude-val">None</span>, |
| } |
| }; |
| <span class="kw">match </span><span class="kw-2">&</span>variant.fields { |
| syn::Fields::Unnamed(fields) <span class="kw">if </span>fields.unnamed.len() == <span class="number">1 </span>=> { |
| borrow.set(<span class="kw-2">&</span>meta.path, borrow_attribute); |
| } |
| <span class="kw">_ </span>=> { |
| <span class="kw">let </span>msg = <span class="string">"#[serde(borrow)] may only be used on newtype variants"</span>; |
| cx.error_spanned_by(variant, msg); |
| } |
| } |
| } <span class="kw">else </span>{ |
| <span class="kw">let </span>path = meta.path.to_token_stream().to_string().replace(<span class="string">' '</span>, <span class="string">""</span>); |
| <span class="kw">return </span><span class="prelude-val">Err</span>( |
| meta.error(<span class="macro">format_args!</span>(<span class="string">"unknown serde variant attribute `{}`"</span>, path)) |
| ); |
| } |
| <span class="prelude-val">Ok</span>(()) |
| }) { |
| cx.syn_error(err); |
| } |
| } |
| |
| Variant { |
| name: Name::from_attrs(unraw(<span class="kw-2">&</span>variant.ident), ser_name, de_name, <span class="prelude-val">Some</span>(de_aliases)), |
| rename_all_rules: RenameAllRules { |
| serialize: rename_all_ser_rule.get().unwrap_or(RenameRule::None), |
| deserialize: rename_all_de_rule.get().unwrap_or(RenameRule::None), |
| }, |
| ser_bound: ser_bound.get(), |
| de_bound: de_bound.get(), |
| skip_deserializing: skip_deserializing.get(), |
| skip_serializing: skip_serializing.get(), |
| other: other.get(), |
| serialize_with: serialize_with.get(), |
| deserialize_with: deserialize_with.get(), |
| borrow: borrow.get(), |
| } |
| } |
| |
| <span class="kw">pub fn </span>name(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span>Name { |
| <span class="kw-2">&</span><span class="self">self</span>.name |
| } |
| |
| <span class="kw">pub fn </span>aliases(<span class="kw-2">&</span><span class="self">self</span>) -> Vec<String> { |
| <span class="self">self</span>.name.deserialize_aliases() |
| } |
| |
| <span class="kw">pub fn </span>rename_by_rules(<span class="kw-2">&mut </span><span class="self">self</span>, rules: <span class="kw-2">&</span>RenameAllRules) { |
| <span class="kw">if </span>!<span class="self">self</span>.name.serialize_renamed { |
| <span class="self">self</span>.name.serialize = rules.serialize.apply_to_variant(<span class="kw-2">&</span><span class="self">self</span>.name.serialize); |
| } |
| <span class="kw">if </span>!<span class="self">self</span>.name.deserialize_renamed { |
| <span class="self">self</span>.name.deserialize = rules.deserialize.apply_to_variant(<span class="kw-2">&</span><span class="self">self</span>.name.deserialize); |
| } |
| } |
| |
| <span class="kw">pub fn </span>rename_all_rules(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span>RenameAllRules { |
| <span class="kw-2">&</span><span class="self">self</span>.rename_all_rules |
| } |
| |
| <span class="kw">pub fn </span>ser_bound(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><<span class="kw-2">&</span>[syn::WherePredicate]> { |
| <span class="self">self</span>.ser_bound.as_ref().map(|vec| <span class="kw-2">&</span>vec[..]) |
| } |
| |
| <span class="kw">pub fn </span>de_bound(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><<span class="kw-2">&</span>[syn::WherePredicate]> { |
| <span class="self">self</span>.de_bound.as_ref().map(|vec| <span class="kw-2">&</span>vec[..]) |
| } |
| |
| <span class="kw">pub fn </span>skip_deserializing(<span class="kw-2">&</span><span class="self">self</span>) -> bool { |
| <span class="self">self</span>.skip_deserializing |
| } |
| |
| <span class="kw">pub fn </span>skip_serializing(<span class="kw-2">&</span><span class="self">self</span>) -> bool { |
| <span class="self">self</span>.skip_serializing |
| } |
| |
| <span class="kw">pub fn </span>other(<span class="kw-2">&</span><span class="self">self</span>) -> bool { |
| <span class="self">self</span>.other |
| } |
| |
| <span class="kw">pub fn </span>serialize_with(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><<span class="kw-2">&</span>syn::ExprPath> { |
| <span class="self">self</span>.serialize_with.as_ref() |
| } |
| |
| <span class="kw">pub fn </span>deserialize_with(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><<span class="kw-2">&</span>syn::ExprPath> { |
| <span class="self">self</span>.deserialize_with.as_ref() |
| } |
| } |
| |
| <span class="doccomment">/// Represents field attribute information |
| </span><span class="kw">pub struct </span>Field { |
| name: Name, |
| skip_serializing: bool, |
| skip_deserializing: bool, |
| skip_serializing_if: <span class="prelude-ty">Option</span><syn::ExprPath>, |
| default: Default, |
| serialize_with: <span class="prelude-ty">Option</span><syn::ExprPath>, |
| deserialize_with: <span class="prelude-ty">Option</span><syn::ExprPath>, |
| ser_bound: <span class="prelude-ty">Option</span><Vec<syn::WherePredicate>>, |
| de_bound: <span class="prelude-ty">Option</span><Vec<syn::WherePredicate>>, |
| borrowed_lifetimes: BTreeSet<syn::Lifetime>, |
| getter: <span class="prelude-ty">Option</span><syn::ExprPath>, |
| flatten: bool, |
| transparent: bool, |
| } |
| |
| <span class="doccomment">/// Represents the default to use for a field when deserializing. |
| </span><span class="kw">pub enum </span>Default { |
| <span class="doccomment">/// Field must always be specified because it does not have a default. |
| </span><span class="prelude-val">None</span>, |
| <span class="doccomment">/// The default is given by `std::default::Default::default()`. |
| </span>Default, |
| <span class="doccomment">/// The default is given by this function. |
| </span>Path(syn::ExprPath), |
| } |
| |
| <span class="kw">impl </span>Default { |
| <span class="kw">pub fn </span>is_none(<span class="kw-2">&</span><span class="self">self</span>) -> bool { |
| <span class="kw">match </span><span class="self">self </span>{ |
| Default::None => <span class="bool-val">true</span>, |
| Default::Default | Default::Path(<span class="kw">_</span>) => <span class="bool-val">false</span>, |
| } |
| } |
| } |
| |
| <span class="kw">impl </span>Field { |
| <span class="doccomment">/// Extract out the `#[serde(...)]` attributes from a struct field. |
| </span><span class="kw">pub fn </span>from_ast( |
| cx: <span class="kw-2">&</span>Ctxt, |
| index: usize, |
| field: <span class="kw-2">&</span>syn::Field, |
| attrs: <span class="prelude-ty">Option</span><<span class="kw-2">&</span>Variant>, |
| container_default: <span class="kw-2">&</span>Default, |
| ) -> <span class="self">Self </span>{ |
| <span class="kw">let </span><span class="kw-2">mut </span>ser_name = Attr::none(cx, RENAME); |
| <span class="kw">let </span><span class="kw-2">mut </span>de_name = Attr::none(cx, RENAME); |
| <span class="kw">let </span><span class="kw-2">mut </span>de_aliases = VecAttr::none(cx, RENAME); |
| <span class="kw">let </span><span class="kw-2">mut </span>skip_serializing = BoolAttr::none(cx, SKIP_SERIALIZING); |
| <span class="kw">let </span><span class="kw-2">mut </span>skip_deserializing = BoolAttr::none(cx, SKIP_DESERIALIZING); |
| <span class="kw">let </span><span class="kw-2">mut </span>skip_serializing_if = Attr::none(cx, SKIP_SERIALIZING_IF); |
| <span class="kw">let </span><span class="kw-2">mut </span>default = Attr::none(cx, DEFAULT); |
| <span class="kw">let </span><span class="kw-2">mut </span>serialize_with = Attr::none(cx, SERIALIZE_WITH); |
| <span class="kw">let </span><span class="kw-2">mut </span>deserialize_with = Attr::none(cx, DESERIALIZE_WITH); |
| <span class="kw">let </span><span class="kw-2">mut </span>ser_bound = Attr::none(cx, BOUND); |
| <span class="kw">let </span><span class="kw-2">mut </span>de_bound = Attr::none(cx, BOUND); |
| <span class="kw">let </span><span class="kw-2">mut </span>borrowed_lifetimes = Attr::none(cx, BORROW); |
| <span class="kw">let </span><span class="kw-2">mut </span>getter = Attr::none(cx, GETTER); |
| <span class="kw">let </span><span class="kw-2">mut </span>flatten = BoolAttr::none(cx, FLATTEN); |
| |
| <span class="kw">let </span>ident = <span class="kw">match </span><span class="kw-2">&</span>field.ident { |
| <span class="prelude-val">Some</span>(ident) => unraw(ident), |
| <span class="prelude-val">None </span>=> index.to_string(), |
| }; |
| |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(borrow_attribute) = attrs.and_then(|variant| variant.borrow.as_ref()) { |
| <span class="kw">if let </span><span class="prelude-val">Ok</span>(borrowable) = borrowable_lifetimes(cx, <span class="kw-2">&</span>ident, field) { |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(lifetimes) = <span class="kw-2">&</span>borrow_attribute.lifetimes { |
| <span class="kw">for </span>lifetime <span class="kw">in </span>lifetimes { |
| <span class="kw">if </span>!borrowable.contains(lifetime) { |
| <span class="kw">let </span>msg = |
| <span class="macro">format!</span>(<span class="string">"field `{}` does not have lifetime {}"</span>, ident, lifetime); |
| cx.error_spanned_by(field, msg); |
| } |
| } |
| borrowed_lifetimes.set(<span class="kw-2">&</span>borrow_attribute.path, lifetimes.clone()); |
| } <span class="kw">else </span>{ |
| borrowed_lifetimes.set(<span class="kw-2">&</span>borrow_attribute.path, borrowable); |
| } |
| } |
| } |
| |
| <span class="kw">for </span>attr <span class="kw">in </span><span class="kw-2">&</span>field.attrs { |
| <span class="kw">if </span>attr.path() != SERDE { |
| <span class="kw">continue</span>; |
| } |
| |
| <span class="kw">if let </span>syn::Meta::List(meta) = <span class="kw-2">&</span>attr.meta { |
| <span class="kw">if </span>meta.tokens.is_empty() { |
| <span class="kw">continue</span>; |
| } |
| } |
| |
| <span class="kw">if let </span><span class="prelude-val">Err</span>(err) = attr.parse_nested_meta(|meta| { |
| <span class="kw">if </span>meta.path == RENAME { |
| <span class="comment">// #[serde(rename = "foo")] |
| // #[serde(rename(serialize = "foo", deserialize = "bar"))] |
| </span><span class="kw">let </span>(ser, de) = get_multiple_renames(cx, <span class="kw-2">&</span>meta)<span class="question-mark">?</span>; |
| ser_name.set_opt(<span class="kw-2">&</span>meta.path, ser.as_ref().map(syn::LitStr::value)); |
| <span class="kw">for </span>de_value <span class="kw">in </span>de { |
| de_name.set_if_none(de_value.value()); |
| de_aliases.insert(<span class="kw-2">&</span>meta.path, de_value.value()); |
| } |
| } <span class="kw">else if </span>meta.path == ALIAS { |
| <span class="comment">// #[serde(alias = "foo")] |
| </span><span class="kw">if let </span><span class="prelude-val">Some</span>(s) = get_lit_str(cx, ALIAS, <span class="kw-2">&</span>meta)<span class="question-mark">? </span>{ |
| de_aliases.insert(<span class="kw-2">&</span>meta.path, s.value()); |
| } |
| } <span class="kw">else if </span>meta.path == DEFAULT { |
| <span class="kw">if </span>meta.input.peek(<span class="macro">Token!</span>[=]) { |
| <span class="comment">// #[serde(default = "...")] |
| </span><span class="kw">if let </span><span class="prelude-val">Some</span>(path) = parse_lit_into_expr_path(cx, DEFAULT, <span class="kw-2">&</span>meta)<span class="question-mark">? </span>{ |
| default.set(<span class="kw-2">&</span>meta.path, Default::Path(path)); |
| } |
| } <span class="kw">else </span>{ |
| <span class="comment">// #[serde(default)] |
| </span>default.set(<span class="kw-2">&</span>meta.path, Default::Default); |
| } |
| } <span class="kw">else if </span>meta.path == SKIP_SERIALIZING { |
| <span class="comment">// #[serde(skip_serializing)] |
| </span>skip_serializing.set_true(<span class="kw-2">&</span>meta.path); |
| } <span class="kw">else if </span>meta.path == SKIP_DESERIALIZING { |
| <span class="comment">// #[serde(skip_deserializing)] |
| </span>skip_deserializing.set_true(<span class="kw-2">&</span>meta.path); |
| } <span class="kw">else if </span>meta.path == SKIP { |
| <span class="comment">// #[serde(skip)] |
| </span>skip_serializing.set_true(<span class="kw-2">&</span>meta.path); |
| skip_deserializing.set_true(<span class="kw-2">&</span>meta.path); |
| } <span class="kw">else if </span>meta.path == SKIP_SERIALIZING_IF { |
| <span class="comment">// #[serde(skip_serializing_if = "...")] |
| </span><span class="kw">if let </span><span class="prelude-val">Some</span>(path) = parse_lit_into_expr_path(cx, SKIP_SERIALIZING_IF, <span class="kw-2">&</span>meta)<span class="question-mark">? </span>{ |
| skip_serializing_if.set(<span class="kw-2">&</span>meta.path, path); |
| } |
| } <span class="kw">else if </span>meta.path == SERIALIZE_WITH { |
| <span class="comment">// #[serde(serialize_with = "...")] |
| </span><span class="kw">if let </span><span class="prelude-val">Some</span>(path) = parse_lit_into_expr_path(cx, SERIALIZE_WITH, <span class="kw-2">&</span>meta)<span class="question-mark">? </span>{ |
| serialize_with.set(<span class="kw-2">&</span>meta.path, path); |
| } |
| } <span class="kw">else if </span>meta.path == DESERIALIZE_WITH { |
| <span class="comment">// #[serde(deserialize_with = "...")] |
| </span><span class="kw">if let </span><span class="prelude-val">Some</span>(path) = parse_lit_into_expr_path(cx, DESERIALIZE_WITH, <span class="kw-2">&</span>meta)<span class="question-mark">? </span>{ |
| deserialize_with.set(<span class="kw-2">&</span>meta.path, path); |
| } |
| } <span class="kw">else if </span>meta.path == WITH { |
| <span class="comment">// #[serde(with = "...")] |
| </span><span class="kw">if let </span><span class="prelude-val">Some</span>(path) = parse_lit_into_expr_path(cx, WITH, <span class="kw-2">&</span>meta)<span class="question-mark">? </span>{ |
| <span class="kw">let </span><span class="kw-2">mut </span>ser_path = path.clone(); |
| ser_path |
| .path |
| .segments |
| .push(Ident::new(<span class="string">"serialize"</span>, Span::call_site()).into()); |
| serialize_with.set(<span class="kw-2">&</span>meta.path, ser_path); |
| <span class="kw">let </span><span class="kw-2">mut </span>de_path = path; |
| de_path |
| .path |
| .segments |
| .push(Ident::new(<span class="string">"deserialize"</span>, Span::call_site()).into()); |
| deserialize_with.set(<span class="kw-2">&</span>meta.path, de_path); |
| } |
| } <span class="kw">else if </span>meta.path == BOUND { |
| <span class="comment">// #[serde(bound = "T: SomeBound")] |
| // #[serde(bound(serialize = "...", deserialize = "..."))] |
| </span><span class="kw">let </span>(ser, de) = get_where_predicates(cx, <span class="kw-2">&</span>meta)<span class="question-mark">?</span>; |
| ser_bound.set_opt(<span class="kw-2">&</span>meta.path, ser); |
| de_bound.set_opt(<span class="kw-2">&</span>meta.path, de); |
| } <span class="kw">else if </span>meta.path == BORROW { |
| <span class="kw">if </span>meta.input.peek(<span class="macro">Token!</span>[=]) { |
| <span class="comment">// #[serde(borrow = "'a + 'b")] |
| </span><span class="kw">let </span>lifetimes = parse_lit_into_lifetimes(cx, <span class="kw-2">&</span>meta)<span class="question-mark">?</span>; |
| <span class="kw">if let </span><span class="prelude-val">Ok</span>(borrowable) = borrowable_lifetimes(cx, <span class="kw-2">&</span>ident, field) { |
| <span class="kw">for </span>lifetime <span class="kw">in </span><span class="kw-2">&</span>lifetimes { |
| <span class="kw">if </span>!borrowable.contains(lifetime) { |
| <span class="kw">let </span>msg = <span class="macro">format!</span>( |
| <span class="string">"field `{}` does not have lifetime {}"</span>, |
| ident, lifetime, |
| ); |
| cx.error_spanned_by(field, msg); |
| } |
| } |
| borrowed_lifetimes.set(<span class="kw-2">&</span>meta.path, lifetimes); |
| } |
| } <span class="kw">else </span>{ |
| <span class="comment">// #[serde(borrow)] |
| </span><span class="kw">if let </span><span class="prelude-val">Ok</span>(borrowable) = borrowable_lifetimes(cx, <span class="kw-2">&</span>ident, field) { |
| borrowed_lifetimes.set(<span class="kw-2">&</span>meta.path, borrowable); |
| } |
| } |
| } <span class="kw">else if </span>meta.path == GETTER { |
| <span class="comment">// #[serde(getter = "...")] |
| </span><span class="kw">if let </span><span class="prelude-val">Some</span>(path) = parse_lit_into_expr_path(cx, GETTER, <span class="kw-2">&</span>meta)<span class="question-mark">? </span>{ |
| getter.set(<span class="kw-2">&</span>meta.path, path); |
| } |
| } <span class="kw">else if </span>meta.path == FLATTEN { |
| <span class="comment">// #[serde(flatten)] |
| </span>flatten.set_true(<span class="kw-2">&</span>meta.path); |
| } <span class="kw">else </span>{ |
| <span class="kw">let </span>path = meta.path.to_token_stream().to_string().replace(<span class="string">' '</span>, <span class="string">""</span>); |
| <span class="kw">return </span><span class="prelude-val">Err</span>( |
| meta.error(<span class="macro">format_args!</span>(<span class="string">"unknown serde field attribute `{}`"</span>, path)) |
| ); |
| } |
| <span class="prelude-val">Ok</span>(()) |
| }) { |
| cx.syn_error(err); |
| } |
| } |
| |
| <span class="comment">// Is skip_deserializing, initialize the field to Default::default() unless a |
| // different default is specified by `#[serde(default = "...")]` on |
| // ourselves or our container (e.g. the struct we are in). |
| </span><span class="kw">if let </span>Default::None = <span class="kw-2">*</span>container_default { |
| <span class="kw">if </span>skip_deserializing.<span class="number">0</span>.value.is_some() { |
| default.set_if_none(Default::Default); |
| } |
| } |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>borrowed_lifetimes = borrowed_lifetimes.get().unwrap_or_default(); |
| <span class="kw">if </span>!borrowed_lifetimes.is_empty() { |
| <span class="comment">// Cow<str> and Cow<[u8]> never borrow by default: |
| // |
| // impl<'de, 'a, T: ?Sized> Deserialize<'de> for Cow<'a, T> |
| // |
| // A #[serde(borrow)] attribute enables borrowing that corresponds |
| // roughly to these impls: |
| // |
| // impl<'de: 'a, 'a> Deserialize<'de> for Cow<'a, str> |
| // impl<'de: 'a, 'a> Deserialize<'de> for Cow<'a, [u8]> |
| </span><span class="kw">if </span>is_cow(<span class="kw-2">&</span>field.ty, is_str) { |
| <span class="kw">let </span><span class="kw-2">mut </span>path = syn::Path { |
| leading_colon: <span class="prelude-val">None</span>, |
| segments: Punctuated::new(), |
| }; |
| <span class="kw">let </span>span = Span::call_site(); |
| path.segments.push(Ident::new(<span class="string">"_serde"</span>, span).into()); |
| path.segments.push(Ident::new(<span class="string">"__private"</span>, span).into()); |
| path.segments.push(Ident::new(<span class="string">"de"</span>, span).into()); |
| path.segments |
| .push(Ident::new(<span class="string">"borrow_cow_str"</span>, span).into()); |
| <span class="kw">let </span>expr = syn::ExprPath { |
| attrs: Vec::new(), |
| qself: <span class="prelude-val">None</span>, |
| path, |
| }; |
| deserialize_with.set_if_none(expr); |
| } <span class="kw">else if </span>is_cow(<span class="kw-2">&</span>field.ty, is_slice_u8) { |
| <span class="kw">let </span><span class="kw-2">mut </span>path = syn::Path { |
| leading_colon: <span class="prelude-val">None</span>, |
| segments: Punctuated::new(), |
| }; |
| <span class="kw">let </span>span = Span::call_site(); |
| path.segments.push(Ident::new(<span class="string">"_serde"</span>, span).into()); |
| path.segments.push(Ident::new(<span class="string">"__private"</span>, span).into()); |
| path.segments.push(Ident::new(<span class="string">"de"</span>, span).into()); |
| path.segments |
| .push(Ident::new(<span class="string">"borrow_cow_bytes"</span>, span).into()); |
| <span class="kw">let </span>expr = syn::ExprPath { |
| attrs: Vec::new(), |
| qself: <span class="prelude-val">None</span>, |
| path, |
| }; |
| deserialize_with.set_if_none(expr); |
| } |
| } <span class="kw">else if </span>is_implicitly_borrowed(<span class="kw-2">&</span>field.ty) { |
| <span class="comment">// Types &str and &[u8] are always implicitly borrowed. No need for |
| // a #[serde(borrow)]. |
| </span>collect_lifetimes(<span class="kw-2">&</span>field.ty, <span class="kw-2">&mut </span>borrowed_lifetimes); |
| } |
| |
| Field { |
| name: Name::from_attrs(ident, ser_name, de_name, <span class="prelude-val">Some</span>(de_aliases)), |
| skip_serializing: skip_serializing.get(), |
| skip_deserializing: skip_deserializing.get(), |
| skip_serializing_if: skip_serializing_if.get(), |
| default: default.get().unwrap_or(Default::None), |
| serialize_with: serialize_with.get(), |
| deserialize_with: deserialize_with.get(), |
| ser_bound: ser_bound.get(), |
| de_bound: de_bound.get(), |
| borrowed_lifetimes, |
| getter: getter.get(), |
| flatten: flatten.get(), |
| transparent: <span class="bool-val">false</span>, |
| } |
| } |
| |
| <span class="kw">pub fn </span>name(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span>Name { |
| <span class="kw-2">&</span><span class="self">self</span>.name |
| } |
| |
| <span class="kw">pub fn </span>aliases(<span class="kw-2">&</span><span class="self">self</span>) -> Vec<String> { |
| <span class="self">self</span>.name.deserialize_aliases() |
| } |
| |
| <span class="kw">pub fn </span>rename_by_rules(<span class="kw-2">&mut </span><span class="self">self</span>, rules: <span class="kw-2">&</span>RenameAllRules) { |
| <span class="kw">if </span>!<span class="self">self</span>.name.serialize_renamed { |
| <span class="self">self</span>.name.serialize = rules.serialize.apply_to_field(<span class="kw-2">&</span><span class="self">self</span>.name.serialize); |
| } |
| <span class="kw">if </span>!<span class="self">self</span>.name.deserialize_renamed { |
| <span class="self">self</span>.name.deserialize = rules.deserialize.apply_to_field(<span class="kw-2">&</span><span class="self">self</span>.name.deserialize); |
| } |
| } |
| |
| <span class="kw">pub fn </span>skip_serializing(<span class="kw-2">&</span><span class="self">self</span>) -> bool { |
| <span class="self">self</span>.skip_serializing |
| } |
| |
| <span class="kw">pub fn </span>skip_deserializing(<span class="kw-2">&</span><span class="self">self</span>) -> bool { |
| <span class="self">self</span>.skip_deserializing |
| } |
| |
| <span class="kw">pub fn </span>skip_serializing_if(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><<span class="kw-2">&</span>syn::ExprPath> { |
| <span class="self">self</span>.skip_serializing_if.as_ref() |
| } |
| |
| <span class="kw">pub fn </span>default(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span>Default { |
| <span class="kw-2">&</span><span class="self">self</span>.default |
| } |
| |
| <span class="kw">pub fn </span>serialize_with(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><<span class="kw-2">&</span>syn::ExprPath> { |
| <span class="self">self</span>.serialize_with.as_ref() |
| } |
| |
| <span class="kw">pub fn </span>deserialize_with(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><<span class="kw-2">&</span>syn::ExprPath> { |
| <span class="self">self</span>.deserialize_with.as_ref() |
| } |
| |
| <span class="kw">pub fn </span>ser_bound(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><<span class="kw-2">&</span>[syn::WherePredicate]> { |
| <span class="self">self</span>.ser_bound.as_ref().map(|vec| <span class="kw-2">&</span>vec[..]) |
| } |
| |
| <span class="kw">pub fn </span>de_bound(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><<span class="kw-2">&</span>[syn::WherePredicate]> { |
| <span class="self">self</span>.de_bound.as_ref().map(|vec| <span class="kw-2">&</span>vec[..]) |
| } |
| |
| <span class="kw">pub fn </span>borrowed_lifetimes(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span>BTreeSet<syn::Lifetime> { |
| <span class="kw-2">&</span><span class="self">self</span>.borrowed_lifetimes |
| } |
| |
| <span class="kw">pub fn </span>getter(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><<span class="kw-2">&</span>syn::ExprPath> { |
| <span class="self">self</span>.getter.as_ref() |
| } |
| |
| <span class="kw">pub fn </span>flatten(<span class="kw-2">&</span><span class="self">self</span>) -> bool { |
| <span class="self">self</span>.flatten |
| } |
| |
| <span class="kw">pub fn </span>transparent(<span class="kw-2">&</span><span class="self">self</span>) -> bool { |
| <span class="self">self</span>.transparent |
| } |
| |
| <span class="kw">pub fn </span>mark_transparent(<span class="kw-2">&mut </span><span class="self">self</span>) { |
| <span class="self">self</span>.transparent = <span class="bool-val">true</span>; |
| } |
| } |
| |
| <span class="kw">type </span>SerAndDe<T> = (<span class="prelude-ty">Option</span><T>, <span class="prelude-ty">Option</span><T>); |
| |
| <span class="kw">fn </span>get_ser_and_de<<span class="lifetime">'c</span>, T, F, R>( |
| cx: <span class="kw-2">&</span><span class="lifetime">'c </span>Ctxt, |
| attr_name: Symbol, |
| meta: <span class="kw-2">&</span>ParseNestedMeta, |
| f: F, |
| ) -> syn::Result<(VecAttr<<span class="lifetime">'c</span>, T>, VecAttr<<span class="lifetime">'c</span>, T>)> |
| <span class="kw">where |
| </span>T: Clone, |
| F: Fn(<span class="kw-2">&</span>Ctxt, Symbol, Symbol, <span class="kw-2">&</span>ParseNestedMeta) -> syn::Result<R>, |
| R: Into<<span class="prelude-ty">Option</span><T>>, |
| { |
| <span class="kw">let </span><span class="kw-2">mut </span>ser_meta = VecAttr::none(cx, attr_name); |
| <span class="kw">let </span><span class="kw-2">mut </span>de_meta = VecAttr::none(cx, attr_name); |
| |
| <span class="kw">let </span>lookahead = meta.input.lookahead1(); |
| <span class="kw">if </span>lookahead.peek(<span class="macro">Token!</span>[=]) { |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(both) = f(cx, attr_name, attr_name, meta)<span class="question-mark">?</span>.into() { |
| ser_meta.insert(<span class="kw-2">&</span>meta.path, both.clone()); |
| de_meta.insert(<span class="kw-2">&</span>meta.path, both); |
| } |
| } <span class="kw">else if </span>lookahead.peek(token::Paren) { |
| meta.parse_nested_meta(|meta| { |
| <span class="kw">if </span>meta.path == SERIALIZE { |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(v) = f(cx, attr_name, SERIALIZE, <span class="kw-2">&</span>meta)<span class="question-mark">?</span>.into() { |
| ser_meta.insert(<span class="kw-2">&</span>meta.path, v); |
| } |
| } <span class="kw">else if </span>meta.path == DESERIALIZE { |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(v) = f(cx, attr_name, DESERIALIZE, <span class="kw-2">&</span>meta)<span class="question-mark">?</span>.into() { |
| de_meta.insert(<span class="kw-2">&</span>meta.path, v); |
| } |
| } <span class="kw">else </span>{ |
| <span class="kw">return </span><span class="prelude-val">Err</span>(meta.error(<span class="macro">format_args!</span>( |
| <span class="string">"malformed {0} attribute, expected `{0}(serialize = ..., deserialize = ...)`"</span>, |
| attr_name, |
| ))); |
| } |
| <span class="prelude-val">Ok</span>(()) |
| })<span class="question-mark">?</span>; |
| } <span class="kw">else </span>{ |
| <span class="kw">return </span><span class="prelude-val">Err</span>(lookahead.error()); |
| } |
| |
| <span class="prelude-val">Ok</span>((ser_meta, de_meta)) |
| } |
| |
| <span class="kw">fn </span>get_renames( |
| cx: <span class="kw-2">&</span>Ctxt, |
| attr_name: Symbol, |
| meta: <span class="kw-2">&</span>ParseNestedMeta, |
| ) -> syn::Result<SerAndDe<syn::LitStr>> { |
| <span class="kw">let </span>(ser, de) = get_ser_and_de(cx, attr_name, meta, get_lit_str2)<span class="question-mark">?</span>; |
| <span class="prelude-val">Ok</span>((ser.at_most_one(), de.at_most_one())) |
| } |
| |
| <span class="kw">fn </span>get_multiple_renames( |
| cx: <span class="kw-2">&</span>Ctxt, |
| meta: <span class="kw-2">&</span>ParseNestedMeta, |
| ) -> syn::Result<(<span class="prelude-ty">Option</span><syn::LitStr>, Vec<syn::LitStr>)> { |
| <span class="kw">let </span>(ser, de) = get_ser_and_de(cx, RENAME, meta, get_lit_str2)<span class="question-mark">?</span>; |
| <span class="prelude-val">Ok</span>((ser.at_most_one(), de.get())) |
| } |
| |
| <span class="kw">fn </span>get_where_predicates( |
| cx: <span class="kw-2">&</span>Ctxt, |
| meta: <span class="kw-2">&</span>ParseNestedMeta, |
| ) -> syn::Result<SerAndDe<Vec<syn::WherePredicate>>> { |
| <span class="kw">let </span>(ser, de) = get_ser_and_de(cx, BOUND, meta, parse_lit_into_where)<span class="question-mark">?</span>; |
| <span class="prelude-val">Ok</span>((ser.at_most_one(), de.at_most_one())) |
| } |
| |
| <span class="kw">fn </span>get_lit_str( |
| cx: <span class="kw-2">&</span>Ctxt, |
| attr_name: Symbol, |
| meta: <span class="kw-2">&</span>ParseNestedMeta, |
| ) -> syn::Result<<span class="prelude-ty">Option</span><syn::LitStr>> { |
| get_lit_str2(cx, attr_name, attr_name, meta) |
| } |
| |
| <span class="kw">fn </span>get_lit_str2( |
| cx: <span class="kw-2">&</span>Ctxt, |
| attr_name: Symbol, |
| meta_item_name: Symbol, |
| meta: <span class="kw-2">&</span>ParseNestedMeta, |
| ) -> syn::Result<<span class="prelude-ty">Option</span><syn::LitStr>> { |
| <span class="kw">let </span>expr: syn::Expr = meta.value()<span class="question-mark">?</span>.parse()<span class="question-mark">?</span>; |
| <span class="kw">let </span><span class="kw-2">mut </span>value = <span class="kw-2">&</span>expr; |
| <span class="kw">while let </span>syn::Expr::Group(e) = value { |
| value = <span class="kw-2">&</span>e.expr; |
| } |
| <span class="kw">if let </span>syn::Expr::Lit(syn::ExprLit { |
| lit: syn::Lit::Str(lit), |
| .. |
| }) = value |
| { |
| <span class="prelude-val">Ok</span>(<span class="prelude-val">Some</span>(lit.clone())) |
| } <span class="kw">else </span>{ |
| cx.error_spanned_by( |
| expr, |
| <span class="macro">format!</span>( |
| <span class="string">"expected serde {} attribute to be a string: `{} = \"...\"`"</span>, |
| attr_name, meta_item_name |
| ), |
| ); |
| <span class="prelude-val">Ok</span>(<span class="prelude-val">None</span>) |
| } |
| } |
| |
| <span class="kw">fn </span>parse_lit_into_path( |
| cx: <span class="kw-2">&</span>Ctxt, |
| attr_name: Symbol, |
| meta: <span class="kw-2">&</span>ParseNestedMeta, |
| ) -> syn::Result<<span class="prelude-ty">Option</span><syn::Path>> { |
| <span class="kw">let </span>string = <span class="kw">match </span>get_lit_str(cx, attr_name, meta)<span class="question-mark">? </span>{ |
| <span class="prelude-val">Some</span>(string) => string, |
| <span class="prelude-val">None </span>=> <span class="kw">return </span><span class="prelude-val">Ok</span>(<span class="prelude-val">None</span>), |
| }; |
| |
| <span class="prelude-val">Ok</span>(<span class="kw">match </span>string.parse() { |
| <span class="prelude-val">Ok</span>(path) => <span class="prelude-val">Some</span>(path), |
| <span class="prelude-val">Err</span>(<span class="kw">_</span>) => { |
| cx.error_spanned_by( |
| <span class="kw-2">&</span>string, |
| <span class="macro">format!</span>(<span class="string">"failed to parse path: {:?}"</span>, string.value()), |
| ); |
| <span class="prelude-val">None |
| </span>} |
| }) |
| } |
| |
| <span class="kw">fn </span>parse_lit_into_expr_path( |
| cx: <span class="kw-2">&</span>Ctxt, |
| attr_name: Symbol, |
| meta: <span class="kw-2">&</span>ParseNestedMeta, |
| ) -> syn::Result<<span class="prelude-ty">Option</span><syn::ExprPath>> { |
| <span class="kw">let </span>string = <span class="kw">match </span>get_lit_str(cx, attr_name, meta)<span class="question-mark">? </span>{ |
| <span class="prelude-val">Some</span>(string) => string, |
| <span class="prelude-val">None </span>=> <span class="kw">return </span><span class="prelude-val">Ok</span>(<span class="prelude-val">None</span>), |
| }; |
| |
| <span class="prelude-val">Ok</span>(<span class="kw">match </span>string.parse() { |
| <span class="prelude-val">Ok</span>(expr) => <span class="prelude-val">Some</span>(expr), |
| <span class="prelude-val">Err</span>(<span class="kw">_</span>) => { |
| cx.error_spanned_by( |
| <span class="kw-2">&</span>string, |
| <span class="macro">format!</span>(<span class="string">"failed to parse path: {:?}"</span>, string.value()), |
| ); |
| <span class="prelude-val">None |
| </span>} |
| }) |
| } |
| |
| <span class="kw">fn </span>parse_lit_into_where( |
| cx: <span class="kw-2">&</span>Ctxt, |
| attr_name: Symbol, |
| meta_item_name: Symbol, |
| meta: <span class="kw-2">&</span>ParseNestedMeta, |
| ) -> syn::Result<Vec<syn::WherePredicate>> { |
| <span class="kw">let </span>string = <span class="kw">match </span>get_lit_str2(cx, attr_name, meta_item_name, meta)<span class="question-mark">? </span>{ |
| <span class="prelude-val">Some</span>(string) => string, |
| <span class="prelude-val">None </span>=> <span class="kw">return </span><span class="prelude-val">Ok</span>(Vec::new()), |
| }; |
| |
| <span class="prelude-val">Ok</span>( |
| <span class="kw">match </span>string.parse_with(Punctuated::<syn::WherePredicate, <span class="macro">Token!</span>[,]>::parse_terminated) { |
| <span class="prelude-val">Ok</span>(predicates) => Vec::from_iter(predicates), |
| <span class="prelude-val">Err</span>(err) => { |
| cx.error_spanned_by(string, err); |
| Vec::new() |
| } |
| }, |
| ) |
| } |
| |
| <span class="kw">fn </span>parse_lit_into_ty( |
| cx: <span class="kw-2">&</span>Ctxt, |
| attr_name: Symbol, |
| meta: <span class="kw-2">&</span>ParseNestedMeta, |
| ) -> syn::Result<<span class="prelude-ty">Option</span><syn::Type>> { |
| <span class="kw">let </span>string = <span class="kw">match </span>get_lit_str(cx, attr_name, meta)<span class="question-mark">? </span>{ |
| <span class="prelude-val">Some</span>(string) => string, |
| <span class="prelude-val">None </span>=> <span class="kw">return </span><span class="prelude-val">Ok</span>(<span class="prelude-val">None</span>), |
| }; |
| |
| <span class="prelude-val">Ok</span>(<span class="kw">match </span>string.parse() { |
| <span class="prelude-val">Ok</span>(ty) => <span class="prelude-val">Some</span>(ty), |
| <span class="prelude-val">Err</span>(<span class="kw">_</span>) => { |
| cx.error_spanned_by( |
| <span class="kw-2">&</span>string, |
| <span class="macro">format!</span>(<span class="string">"failed to parse type: {} = {:?}"</span>, attr_name, string.value()), |
| ); |
| <span class="prelude-val">None |
| </span>} |
| }) |
| } |
| |
| <span class="comment">// Parses a string literal like "'a + 'b + 'c" containing a nonempty list of |
| // lifetimes separated by `+`. |
| </span><span class="kw">fn </span>parse_lit_into_lifetimes( |
| cx: <span class="kw-2">&</span>Ctxt, |
| meta: <span class="kw-2">&</span>ParseNestedMeta, |
| ) -> syn::Result<BTreeSet<syn::Lifetime>> { |
| <span class="kw">let </span>string = <span class="kw">match </span>get_lit_str(cx, BORROW, meta)<span class="question-mark">? </span>{ |
| <span class="prelude-val">Some</span>(string) => string, |
| <span class="prelude-val">None </span>=> <span class="kw">return </span><span class="prelude-val">Ok</span>(BTreeSet::new()), |
| }; |
| |
| <span class="kw">if let </span><span class="prelude-val">Ok</span>(lifetimes) = string.parse_with(|input: ParseStream| { |
| <span class="kw">let </span><span class="kw-2">mut </span>set = BTreeSet::new(); |
| <span class="kw">while </span>!input.is_empty() { |
| <span class="kw">let </span>lifetime: Lifetime = input.parse()<span class="question-mark">?</span>; |
| <span class="kw">if </span>!set.insert(lifetime.clone()) { |
| cx.error_spanned_by( |
| <span class="kw-2">&</span>string, |
| <span class="macro">format!</span>(<span class="string">"duplicate borrowed lifetime `{}`"</span>, lifetime), |
| ); |
| } |
| <span class="kw">if </span>input.is_empty() { |
| <span class="kw">break</span>; |
| } |
| input.parse::<<span class="macro">Token!</span>[+]>()<span class="question-mark">?</span>; |
| } |
| <span class="prelude-val">Ok</span>(set) |
| }) { |
| <span class="kw">if </span>lifetimes.is_empty() { |
| cx.error_spanned_by(string, <span class="string">"at least one lifetime must be borrowed"</span>); |
| } |
| <span class="kw">return </span><span class="prelude-val">Ok</span>(lifetimes); |
| } |
| |
| cx.error_spanned_by( |
| <span class="kw-2">&</span>string, |
| <span class="macro">format!</span>(<span class="string">"failed to parse borrowed lifetimes: {:?}"</span>, string.value()), |
| ); |
| <span class="prelude-val">Ok</span>(BTreeSet::new()) |
| } |
| |
| <span class="kw">fn </span>is_implicitly_borrowed(ty: <span class="kw-2">&</span>syn::Type) -> bool { |
| is_implicitly_borrowed_reference(ty) || is_option(ty, is_implicitly_borrowed_reference) |
| } |
| |
| <span class="kw">fn </span>is_implicitly_borrowed_reference(ty: <span class="kw-2">&</span>syn::Type) -> bool { |
| is_reference(ty, is_str) || is_reference(ty, is_slice_u8) |
| } |
| |
| <span class="comment">// Whether the type looks like it might be `std::borrow::Cow<T>` where elem="T". |
| // This can have false negatives and false positives. |
| // |
| // False negative: |
| // |
| // use std::borrow::Cow as Pig; |
| // |
| // #[derive(Deserialize)] |
| // struct S<'a> { |
| // #[serde(borrow)] |
| // pig: Pig<'a, str>, |
| // } |
| // |
| // False positive: |
| // |
| // type str = [i16]; |
| // |
| // #[derive(Deserialize)] |
| // struct S<'a> { |
| // #[serde(borrow)] |
| // cow: Cow<'a, str>, |
| // } |
| </span><span class="kw">fn </span>is_cow(ty: <span class="kw-2">&</span>syn::Type, elem: <span class="kw">fn</span>(<span class="kw-2">&</span>syn::Type) -> bool) -> bool { |
| <span class="kw">let </span>path = <span class="kw">match </span>ungroup(ty) { |
| syn::Type::Path(ty) => <span class="kw-2">&</span>ty.path, |
| <span class="kw">_ </span>=> { |
| <span class="kw">return </span><span class="bool-val">false</span>; |
| } |
| }; |
| <span class="kw">let </span>seg = <span class="kw">match </span>path.segments.last() { |
| <span class="prelude-val">Some</span>(seg) => seg, |
| <span class="prelude-val">None </span>=> { |
| <span class="kw">return </span><span class="bool-val">false</span>; |
| } |
| }; |
| <span class="kw">let </span>args = <span class="kw">match </span><span class="kw-2">&</span>seg.arguments { |
| syn::PathArguments::AngleBracketed(bracketed) => <span class="kw-2">&</span>bracketed.args, |
| <span class="kw">_ </span>=> { |
| <span class="kw">return </span><span class="bool-val">false</span>; |
| } |
| }; |
| seg.ident == <span class="string">"Cow" |
| </span>&& args.len() == <span class="number">2 |
| </span>&& <span class="kw">match </span>(<span class="kw-2">&</span>args[<span class="number">0</span>], <span class="kw-2">&</span>args[<span class="number">1</span>]) { |
| (syn::GenericArgument::Lifetime(<span class="kw">_</span>), syn::GenericArgument::Type(arg)) => elem(arg), |
| <span class="kw">_ </span>=> <span class="bool-val">false</span>, |
| } |
| } |
| |
| <span class="kw">fn </span>is_option(ty: <span class="kw-2">&</span>syn::Type, elem: <span class="kw">fn</span>(<span class="kw-2">&</span>syn::Type) -> bool) -> bool { |
| <span class="kw">let </span>path = <span class="kw">match </span>ungroup(ty) { |
| syn::Type::Path(ty) => <span class="kw-2">&</span>ty.path, |
| <span class="kw">_ </span>=> { |
| <span class="kw">return </span><span class="bool-val">false</span>; |
| } |
| }; |
| <span class="kw">let </span>seg = <span class="kw">match </span>path.segments.last() { |
| <span class="prelude-val">Some</span>(seg) => seg, |
| <span class="prelude-val">None </span>=> { |
| <span class="kw">return </span><span class="bool-val">false</span>; |
| } |
| }; |
| <span class="kw">let </span>args = <span class="kw">match </span><span class="kw-2">&</span>seg.arguments { |
| syn::PathArguments::AngleBracketed(bracketed) => <span class="kw-2">&</span>bracketed.args, |
| <span class="kw">_ </span>=> { |
| <span class="kw">return </span><span class="bool-val">false</span>; |
| } |
| }; |
| seg.ident == <span class="string">"Option" |
| </span>&& args.len() == <span class="number">1 |
| </span>&& <span class="kw">match </span><span class="kw-2">&</span>args[<span class="number">0</span>] { |
| syn::GenericArgument::Type(arg) => elem(arg), |
| <span class="kw">_ </span>=> <span class="bool-val">false</span>, |
| } |
| } |
| |
| <span class="comment">// Whether the type looks like it might be `&T` where elem="T". This can have |
| // false negatives and false positives. |
| // |
| // False negative: |
| // |
| // type Yarn = str; |
| // |
| // #[derive(Deserialize)] |
| // struct S<'a> { |
| // r: &'a Yarn, |
| // } |
| // |
| // False positive: |
| // |
| // type str = [i16]; |
| // |
| // #[derive(Deserialize)] |
| // struct S<'a> { |
| // r: &'a str, |
| // } |
| </span><span class="kw">fn </span>is_reference(ty: <span class="kw-2">&</span>syn::Type, elem: <span class="kw">fn</span>(<span class="kw-2">&</span>syn::Type) -> bool) -> bool { |
| <span class="kw">match </span>ungroup(ty) { |
| syn::Type::Reference(ty) => ty.mutability.is_none() && elem(<span class="kw-2">&</span>ty.elem), |
| <span class="kw">_ </span>=> <span class="bool-val">false</span>, |
| } |
| } |
| |
| <span class="kw">fn </span>is_str(ty: <span class="kw-2">&</span>syn::Type) -> bool { |
| is_primitive_type(ty, <span class="string">"str"</span>) |
| } |
| |
| <span class="kw">fn </span>is_slice_u8(ty: <span class="kw-2">&</span>syn::Type) -> bool { |
| <span class="kw">match </span>ungroup(ty) { |
| syn::Type::Slice(ty) => is_primitive_type(<span class="kw-2">&</span>ty.elem, <span class="string">"u8"</span>), |
| <span class="kw">_ </span>=> <span class="bool-val">false</span>, |
| } |
| } |
| |
| <span class="kw">fn </span>is_primitive_type(ty: <span class="kw-2">&</span>syn::Type, primitive: <span class="kw-2">&</span>str) -> bool { |
| <span class="kw">match </span>ungroup(ty) { |
| syn::Type::Path(ty) => ty.qself.is_none() && is_primitive_path(<span class="kw-2">&</span>ty.path, primitive), |
| <span class="kw">_ </span>=> <span class="bool-val">false</span>, |
| } |
| } |
| |
| <span class="kw">fn </span>is_primitive_path(path: <span class="kw-2">&</span>syn::Path, primitive: <span class="kw-2">&</span>str) -> bool { |
| path.leading_colon.is_none() |
| && path.segments.len() == <span class="number">1 |
| </span>&& path.segments[<span class="number">0</span>].ident == primitive |
| && path.segments[<span class="number">0</span>].arguments.is_empty() |
| } |
| |
| <span class="comment">// All lifetimes that this type could borrow from a Deserializer. |
| // |
| // For example a type `S<'a, 'b>` could borrow `'a` and `'b`. On the other hand |
| // a type `for<'a> fn(&'a str)` could not borrow `'a` from the Deserializer. |
| // |
| // This is used when there is an explicit or implicit `#[serde(borrow)]` |
| // attribute on the field so there must be at least one borrowable lifetime. |
| </span><span class="kw">fn </span>borrowable_lifetimes( |
| cx: <span class="kw-2">&</span>Ctxt, |
| name: <span class="kw-2">&</span>str, |
| field: <span class="kw-2">&</span>syn::Field, |
| ) -> <span class="prelude-ty">Result</span><BTreeSet<syn::Lifetime>, ()> { |
| <span class="kw">let </span><span class="kw-2">mut </span>lifetimes = BTreeSet::new(); |
| collect_lifetimes(<span class="kw-2">&</span>field.ty, <span class="kw-2">&mut </span>lifetimes); |
| <span class="kw">if </span>lifetimes.is_empty() { |
| <span class="kw">let </span>msg = <span class="macro">format!</span>(<span class="string">"field `{}` has no lifetimes to borrow"</span>, name); |
| cx.error_spanned_by(field, msg); |
| <span class="prelude-val">Err</span>(()) |
| } <span class="kw">else </span>{ |
| <span class="prelude-val">Ok</span>(lifetimes) |
| } |
| } |
| |
| <span class="kw">fn </span>collect_lifetimes(ty: <span class="kw-2">&</span>syn::Type, out: <span class="kw-2">&mut </span>BTreeSet<syn::Lifetime>) { |
| <span class="kw">match </span>ty { |
| syn::Type::Slice(ty) => { |
| collect_lifetimes(<span class="kw-2">&</span>ty.elem, out); |
| } |
| syn::Type::Array(ty) => { |
| collect_lifetimes(<span class="kw-2">&</span>ty.elem, out); |
| } |
| syn::Type::Ptr(ty) => { |
| collect_lifetimes(<span class="kw-2">&</span>ty.elem, out); |
| } |
| syn::Type::Reference(ty) => { |
| out.extend(ty.lifetime.iter().cloned()); |
| collect_lifetimes(<span class="kw-2">&</span>ty.elem, out); |
| } |
| syn::Type::Tuple(ty) => { |
| <span class="kw">for </span>elem <span class="kw">in </span><span class="kw-2">&</span>ty.elems { |
| collect_lifetimes(elem, out); |
| } |
| } |
| syn::Type::Path(ty) => { |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(qself) = <span class="kw-2">&</span>ty.qself { |
| collect_lifetimes(<span class="kw-2">&</span>qself.ty, out); |
| } |
| <span class="kw">for </span>seg <span class="kw">in </span><span class="kw-2">&</span>ty.path.segments { |
| <span class="kw">if let </span>syn::PathArguments::AngleBracketed(bracketed) = <span class="kw-2">&</span>seg.arguments { |
| <span class="kw">for </span>arg <span class="kw">in </span><span class="kw-2">&</span>bracketed.args { |
| <span class="kw">match </span>arg { |
| syn::GenericArgument::Lifetime(lifetime) => { |
| out.insert(lifetime.clone()); |
| } |
| syn::GenericArgument::Type(ty) => { |
| collect_lifetimes(ty, out); |
| } |
| syn::GenericArgument::AssocType(binding) => { |
| collect_lifetimes(<span class="kw-2">&</span>binding.ty, out); |
| } |
| <span class="kw">_ </span>=> {} |
| } |
| } |
| } |
| } |
| } |
| syn::Type::Paren(ty) => { |
| collect_lifetimes(<span class="kw-2">&</span>ty.elem, out); |
| } |
| syn::Type::Group(ty) => { |
| collect_lifetimes(<span class="kw-2">&</span>ty.elem, out); |
| } |
| syn::Type::Macro(ty) => { |
| collect_lifetimes_from_tokens(ty.mac.tokens.clone(), out); |
| } |
| syn::Type::BareFn(<span class="kw">_</span>) |
| | syn::Type::Never(<span class="kw">_</span>) |
| | syn::Type::TraitObject(<span class="kw">_</span>) |
| | syn::Type::ImplTrait(<span class="kw">_</span>) |
| | syn::Type::Infer(<span class="kw">_</span>) |
| | syn::Type::Verbatim(<span class="kw">_</span>) => {} |
| |
| <span class="attribute">#[cfg_attr(all(test, exhaustive), deny(non_exhaustive_omitted_patterns))] |
| </span><span class="kw">_ </span>=> {} |
| } |
| } |
| |
| <span class="kw">fn </span>collect_lifetimes_from_tokens(tokens: TokenStream, out: <span class="kw-2">&mut </span>BTreeSet<syn::Lifetime>) { |
| <span class="kw">let </span><span class="kw-2">mut </span>iter = tokens.into_iter(); |
| <span class="kw">while let </span><span class="prelude-val">Some</span>(tt) = iter.next() { |
| <span class="kw">match </span><span class="kw-2">&</span>tt { |
| TokenTree::Punct(op) <span class="kw">if </span>op.as_char() == <span class="string">'\'' </span>&& op.spacing() == Spacing::Joint => { |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(TokenTree::Ident(ident)) = iter.next() { |
| out.insert(syn::Lifetime { |
| apostrophe: op.span(), |
| ident, |
| }); |
| } |
| } |
| TokenTree::Group(group) => { |
| <span class="kw">let </span>tokens = group.stream(); |
| collect_lifetimes_from_tokens(tokens, out); |
| } |
| <span class="kw">_ </span>=> {} |
| } |
| } |
| } |
| </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> |
