<!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 to the Rust file `/home/jule/.cargo/registry/src/github.com-1ecc6299db9ec823/serde_derive_internals-0.15.1/src/attr.rs`."> <meta name="keywords" content="rust, rustlang, rust-lang"> <title>attr.rs.html -- source</title> <link rel="stylesheet" type="text/css" href="../../normalize.css"> <link rel="stylesheet" type="text/css" href="../../rustdoc.css"> <link rel="stylesheet" type="text/css" href="../../main.css"> </head> <body class="rustdoc source"> <!--[if lte IE 8]> <div class="warning"> This old browser is unsupported and will most likely display funky things. </div> <![endif]--> <nav class="sidebar"> </nav> <nav class="sub"> <form class="search-form js-only"> <div class="search-container"> <input class="search-input" name="search" autocomplete="off" placeholder="Click or 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743</span> <span id="744"> 744</span> <span id="745"> 745</span> <span id="746"> 746</span> <span id="747"> 747</span> <span id="748"> 748</span> <span id="749"> 749</span> <span id="750"> 750</span> <span id="751"> 751</span> <span id="752"> 752</span> <span id="753"> 753</span> <span id="754"> 754</span> <span id="755"> 755</span> <span id="756"> 756</span> <span id="757"> 757</span> <span id="758"> 758</span> <span id="759"> 759</span> <span id="760"> 760</span> <span id="761"> 761</span> <span id="762"> 762</span> <span id="763"> 763</span> <span id="764"> 764</span> <span id="765"> 765</span> <span id="766"> 766</span> <span id="767"> 767</span> <span id="768"> 768</span> <span id="769"> 769</span> <span id="770"> 770</span> <span id="771"> 771</span> <span id="772"> 772</span> <span id="773"> 773</span> <span id="774"> 774</span> <span id="775"> 775</span> <span id="776"> 776</span> <span id="777"> 777</span> <span id="778"> 778</span> <span id="779"> 779</span> <span id="780"> 780</span> <span id="781"> 781</span> <span id="782"> 782</span> <span id="783"> 783</span> <span id="784"> 784</span> <span id="785"> 785</span> <span id="786"> 786</span> <span id="787"> 787</span> <span id="788"> 788</span> <span id="789"> 789</span> <span id="790"> 790</span> <span id="791"> 791</span> <span id="792"> 792</span> <span id="793"> 793</span> <span id="794"> 794</span> <span id="795"> 795</span> <span id="796"> 796</span> <span id="797"> 797</span> <span id="798"> 798</span> <span id="799"> 799</span> <span id="800"> 800</span> <span id="801"> 801</span> <span id="802"> 802</span> <span id="803"> 803</span> <span id="804"> 804</span> <span id="805"> 805</span> <span id="806"> 806</span> <span id="807"> 807</span> <span id="808"> 808</span> <span id="809"> 809</span> <span id="810"> 810</span> <span id="811"> 811</span> <span id="812"> 812</span> <span id="813"> 813</span> <span id="814"> 814</span> <span id="815"> 815</span> <span id="816"> 816</span> <span id="817"> 817</span> <span id="818"> 818</span> <span id="819"> 819</span> <span id="820"> 820</span> <span id="821"> 821</span> <span id="822"> 822</span> <span id="823"> 823</span> <span id="824"> 824</span> <span id="825"> 825</span> <span id="826"> 826</span> <span id="827"> 827</span> <span id="828"> 828</span> <span id="829"> 829</span> <span id="830"> 830</span> <span id="831"> 831</span> <span id="832"> 832</span> <span id="833"> 833</span> <span id="834"> 834</span> <span id="835"> 835</span> <span id="836"> 836</span> <span id="837"> 837</span> <span id="838"> 838</span> <span id="839"> 839</span> <span id="840"> 840</span> <span id="841"> 841</span> <span id="842"> 842</span> <span id="843"> 843</span> <span id="844"> 844</span> <span id="845"> 845</span> <span id="846"> 846</span> <span id="847"> 847</span> <span id="848"> 848</span> <span id="849"> 849</span> <span id="850"> 850</span> <span id="851"> 851</span> <span id="852"> 852</span> <span id="853"> 853</span> <span id="854"> 854</span> <span id="855"> 855</span> <span id="856"> 856</span> <span id="857"> 857</span> <span id="858"> 858</span> <span id="859"> 859</span> <span id="860"> 860</span> <span id="861"> 861</span> <span id="862"> 862</span> <span id="863"> 863</span> <span id="864"> 864</span> <span id="865"> 865</span> <span id="866"> 866</span> <span id="867"> 867</span> <span id="868"> 868</span> <span id="869"> 869</span> <span id="870"> 870</span> <span id="871"> 871</span> <span id="872"> 872</span> <span id="873"> 873</span> <span id="874"> 874</span> <span id="875"> 875</span> <span id="876"> 876</span> <span id="877"> 877</span> <span id="878"> 878</span> <span id="879"> 879</span> <span id="880"> 880</span> <span id="881"> 881</span> <span id="882"> 882</span> <span id="883"> 883</span> <span id="884"> 884</span> <span id="885"> 885</span> <span id="886"> 886</span> <span id="887"> 887</span> <span id="888"> 888</span> <span id="889"> 889</span> <span id="890"> 890</span> <span id="891"> 891</span> <span id="892"> 892</span> <span id="893"> 893</span> <span id="894"> 894</span> <span id="895"> 895</span> <span id="896"> 896</span> <span id="897"> 897</span> <span id="898"> 898</span> <span id="899"> 899</span> <span id="900"> 900</span> <span id="901"> 901</span> <span id="902"> 902</span> <span id="903"> 903</span> <span id="904"> 904</span> <span id="905"> 905</span> <span id="906"> 906</span> <span id="907"> 907</span> <span id="908"> 908</span> <span id="909"> 909</span> <span id="910"> 910</span> <span id="911"> 911</span> <span id="912"> 912</span> <span id="913"> 913</span> <span id="914"> 914</span> <span id="915"> 915</span> <span id="916"> 916</span> <span id="917"> 917</span> <span id="918"> 918</span> <span id="919"> 919</span> <span id="920"> 920</span> <span id="921"> 921</span> <span id="922"> 922</span> <span id="923"> 923</span> <span id="924"> 924</span> <span id="925"> 925</span> <span id="926"> 926</span> <span id="927"> 927</span> <span id="928"> 928</span> <span id="929"> 929</span> <span id="930"> 930</span> <span id="931"> 931</span> <span id="932"> 932</span> <span id="933"> 933</span> <span id="934"> 934</span> <span id="935"> 935</span> <span id="936"> 936</span> <span id="937"> 937</span> <span id="938"> 938</span> <span id="939"> 939</span> <span id="940"> 940</span> <span id="941"> 941</span> <span id="942"> 942</span> <span id="943"> 943</span> <span id="944"> 944</span> <span id="945"> 945</span> <span id="946"> 946</span> <span id="947"> 947</span> <span id="948"> 948</span> <span id="949"> 949</span> <span id="950"> 950</span> <span id="951"> 951</span> <span id="952"> 952</span> <span id="953"> 953</span> <span id="954"> 954</span> <span id="955"> 955</span> <span id="956"> 956</span> <span id="957"> 957</span> <span id="958"> 958</span> <span id="959"> 959</span> <span id="960"> 960</span> <span id="961"> 961</span> <span id="962"> 962</span> <span id="963"> 963</span> <span id="964"> 964</span> <span id="965"> 965</span> <span id="966"> 966</span> <span id="967"> 967</span> <span id="968"> 968</span> <span id="969"> 969</span> <span id="970"> 970</span> <span id="971"> 971</span> <span id="972"> 972</span> <span id="973"> 973</span> <span id="974"> 974</span> <span id="975"> 975</span> <span id="976"> 976</span> <span id="977"> 977</span> <span id="978"> 978</span> <span id="979"> 979</span> <span id="980"> 980</span> <span id="981"> 981</span> <span id="982"> 982</span> <span id="983"> 983</span> <span id="984"> 984</span> <span id="985"> 985</span> <span id="986"> 986</span> <span id="987"> 987</span> <span id="988"> 988</span> <span id="989"> 989</span> <span id="990"> 990</span> <span id="991"> 991</span> <span id="992"> 992</span> <span id="993"> 993</span> <span id="994"> 994</span> <span id="995"> 995</span> <span id="996"> 996</span> <span id="997"> 997</span> <span id="998"> 998</span> <span id="999"> 999</span> <span id="1000">1000</span> <span id="1001">1001</span> <span id="1002">1002</span> <span id="1003">1003</span> <span id="1004">1004</span> <span id="1005">1005</span> <span id="1006">1006</span> <span id="1007">1007</span> <span id="1008">1008</span> <span id="1009">1009</span> <span id="1010">1010</span> <span id="1011">1011</span> <span id="1012">1012</span> <span id="1013">1013</span> <span id="1014">1014</span> <span id="1015">1015</span> <span id="1016">1016</span> <span id="1017">1017</span> <span id="1018">1018</span> <span id="1019">1019</span> <span id="1020">1020</span> <span id="1021">1021</span> <span id="1022">1022</span> <span id="1023">1023</span> <span id="1024">1024</span> <span id="1025">1025</span> <span id="1026">1026</span> <span id="1027">1027</span> <span id="1028">1028</span> <span id="1029">1029</span> <span id="1030">1030</span> <span id="1031">1031</span> <span id="1032">1032</span> <span id="1033">1033</span> <span id="1034">1034</span> <span id="1035">1035</span> <span id="1036">1036</span> <span id="1037">1037</span> <span id="1038">1038</span> <span id="1039">1039</span> <span id="1040">1040</span> <span id="1041">1041</span> <span id="1042">1042</span> <span id="1043">1043</span> <span id="1044">1044</span> <span id="1045">1045</span> <span id="1046">1046</span> <span id="1047">1047</span> <span id="1048">1048</span> <span id="1049">1049</span> <span id="1050">1050</span> <span id="1051">1051</span> <span id="1052">1052</span> <span id="1053">1053</span> <span id="1054">1054</span> <span id="1055">1055</span> <span id="1056">1056</span> <span id="1057">1057</span> <span id="1058">1058</span> <span id="1059">1059</span> <span id="1060">1060</span> <span id="1061">1061</span> <span id="1062">1062</span> <span id="1063">1063</span> <span id="1064">1064</span> <span id="1065">1065</span> <span id="1066">1066</span> <span id="1067">1067</span> <span id="1068">1068</span> <span id="1069">1069</span> <span id="1070">1070</span> <span id="1071">1071</span> <span id="1072">1072</span> <span id="1073">1073</span> <span id="1074">1074</span> <span id="1075">1075</span> <span id="1076">1076</span> <span id="1077">1077</span> <span id="1078">1078</span> <span id="1079">1079</span> <span id="1080">1080</span> <span id="1081">1081</span> <span id="1082">1082</span> <span id="1083">1083</span> <span id="1084">1084</span> <span id="1085">1085</span> <span id="1086">1086</span> <span id="1087">1087</span> <span id="1088">1088</span> <span id="1089">1089</span> <span id="1090">1090</span> <span id="1091">1091</span> <span id="1092">1092</span> <span id="1093">1093</span> <span id="1094">1094</span> <span id="1095">1095</span> <span id="1096">1096</span> <span id="1097">1097</span> <span id="1098">1098</span> <span id="1099">1099</span> <span id="1100">1100</span> <span id="1101">1101</span> <span id="1102">1102</span> <span id="1103">1103</span> <span id="1104">1104</span> <span id="1105">1105</span> <span id="1106">1106</span> <span id="1107">1107</span> <span id="1108">1108</span> <span id="1109">1109</span> <span id="1110">1110</span> <span id="1111">1111</span> <span id="1112">1112</span> <span id="1113">1113</span> <span id="1114">1114</span> <span id="1115">1115</span> <span id="1116">1116</span> <span id="1117">1117</span> <span id="1118">1118</span> <span id="1119">1119</span> <span id="1120">1120</span> <span id="1121">1121</span> <span id="1122">1122</span> <span id="1123">1123</span> <span id="1124">1124</span> <span id="1125">1125</span> <span id="1126">1126</span> <span id="1127">1127</span> <span id="1128">1128</span> <span id="1129">1129</span> <span id="1130">1130</span> <span id="1131">1131</span> <span id="1132">1132</span> <span id="1133">1133</span> <span id="1134">1134</span> <span id="1135">1135</span> <span id="1136">1136</span> <span id="1137">1137</span> <span id="1138">1138</span> <span id="1139">1139</span> <span id="1140">1140</span> <span id="1141">1141</span> <span id="1142">1142</span> <span id="1143">1143</span> <span id="1144">1144</span> <span id="1145">1145</span> <span id="1146">1146</span> <span id="1147">1147</span> <span id="1148">1148</span> <span id="1149">1149</span> <span id="1150">1150</span> <span id="1151">1151</span> <span id="1152">1152</span> <span id="1153">1153</span> <span id="1154">1154</span> <span id="1155">1155</span> <span id="1156">1156</span> <span id="1157">1157</span> <span id="1158">1158</span> <span id="1159">1159</span> <span id="1160">1160</span> <span id="1161">1161</span> <span id="1162">1162</span> <span id="1163">1163</span> <span id="1164">1164</span> <span id="1165">1165</span> <span id="1166">1166</span> <span id="1167">1167</span> <span id="1168">1168</span> <span id="1169">1169</span> <span id="1170">1170</span> <span id="1171">1171</span> <span id="1172">1172</span> <span id="1173">1173</span> <span id="1174">1174</span> <span id="1175">1175</span> <span id="1176">1176</span> <span id="1177">1177</span> <span id="1178">1178</span> <span id="1179">1179</span> <span id="1180">1180</span> <span id="1181">1181</span> <span id="1182">1182</span> <span id="1183">1183</span> <span id="1184">1184</span> <span id="1185">1185</span> <span id="1186">1186</span> <span id="1187">1187</span> <span id="1188">1188</span> <span id="1189">1189</span> <span id="1190">1190</span> <span id="1191">1191</span> <span id="1192">1192</span> <span id="1193">1193</span> <span id="1194">1194</span> <span id="1195">1195</span> <span id="1196">1196</span> <span id="1197">1197</span> <span id="1198">1198</span> <span id="1199">1199</span> <span id="1200">1200</span> <span id="1201">1201</span> <span id="1202">1202</span> <span id="1203">1203</span> <span id="1204">1204</span> <span id="1205">1205</span> <span id="1206">1206</span> <span id="1207">1207</span> <span id="1208">1208</span> <span id="1209">1209</span> <span id="1210">1210</span> <span id="1211">1211</span> <span id="1212">1212</span> <span id="1213">1213</span> <span id="1214">1214</span> <span id="1215">1215</span> </pre><pre class="rust "> <span class="comment">// Copyright 2017 Serde Developers</span> <span class="comment">//</span> <span class="comment">// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or</span> <span class="comment">// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license</span> <span class="comment">// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your</span> <span class="comment">// option. This file may not be copied, modified, or distributed</span> <span class="comment">// except according to those terms.</span> <span class="kw">use</span> <span class="ident">Ctxt</span>; <span class="kw">use</span> <span class="ident">syn</span>; <span class="kw">use</span> <span class="ident">syn</span>::<span class="ident">MetaItem</span>::{<span class="ident">List</span>, <span class="ident">NameValue</span>, <span class="ident">Word</span>}; <span class="kw">use</span> <span class="ident">syn</span>::<span class="ident">NestedMetaItem</span>::{<span class="ident">Literal</span>, <span class="ident">MetaItem</span>}; <span class="kw">use</span> <span class="ident">synom</span>::<span class="ident">IResult</span>; <span class="kw">use</span> <span class="ident">std</span>::<span class="ident">collections</span>::<span class="ident">BTreeSet</span>; <span class="kw">use</span> <span class="ident">std</span>::<span class="ident">str</span>::<span class="ident">FromStr</span>; <span class="comment">// This module handles parsing of `#[serde(...)]` attributes. The entrypoints</span> <span class="comment">// are `attr::Container::from_ast`, `attr::Variant::from_ast`, and</span> <span class="comment">// `attr::Field::from_ast`. Each returns an instance of the corresponding</span> <span class="comment">// struct. Note that none of them return a Result. Unrecognized, malformed, or</span> <span class="comment">// duplicated attributes result in a span_err but otherwise are ignored. The</span> <span class="comment">// user will see errors simultaneously for all bad attributes in the crate</span> <span class="comment">// rather than just the first.</span> <span class="kw">pub</span> <span class="kw">use</span> <span class="ident">case</span>::<span class="ident">RenameRule</span>; <span class="kw">struct</span> <span class="ident">Attr</span><span class="op"><</span><span class="lifetime">'c</span>, <span class="ident">T</span><span class="op">></span> { <span class="ident">cx</span>: <span class="kw-2">&</span><span class="lifetime">'c</span> <span class="ident">Ctxt</span>, <span class="ident">name</span>: <span class="kw-2">&</span><span class="lifetime">'static</span> <span class="ident">str</span>, <span class="ident">value</span>: <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>, } <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'c</span>, <span class="ident">T</span><span class="op">></span> <span class="ident">Attr</span><span class="op"><</span><span class="lifetime">'c</span>, <span class="ident">T</span><span class="op">></span> { <span class="kw">fn</span> <span class="ident">none</span>(<span class="ident">cx</span>: <span class="kw-2">&</span><span class="lifetime">'c</span> <span class="ident">Ctxt</span>, <span class="ident">name</span>: <span class="kw-2">&</span><span class="lifetime">'static</span> <span class="ident">str</span>) <span class="op">-></span> <span class="self">Self</span> { <span class="ident">Attr</span> { <span class="ident">cx</span>: <span class="ident">cx</span>, <span class="ident">name</span>: <span class="ident">name</span>, <span class="ident">value</span>: <span class="prelude-val">None</span>, } } <span class="kw">fn</span> <span class="ident">set</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">value</span>: <span class="ident">T</span>) { <span class="kw">if</span> <span class="self">self</span>.<span class="ident">value</span>.<span class="ident">is_some</span>() { <span class="self">self</span>.<span class="ident">cx</span> .<span class="ident">error</span>(<span class="macro">format</span><span class="macro">!</span>(<span class="string">"duplicate serde attribute `{}`"</span>, <span class="self">self</span>.<span class="ident">name</span>)); } <span class="kw">else</span> { <span class="self">self</span>.<span class="ident">value</span> <span class="op">=</span> <span class="prelude-val">Some</span>(<span class="ident">value</span>); } } <span class="kw">fn</span> <span class="ident">set_opt</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">value</span>: <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>) { <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">value</span>) <span class="op">=</span> <span class="ident">value</span> { <span class="self">self</span>.<span class="ident">set</span>(<span class="ident">value</span>); } } <span class="kw">fn</span> <span class="ident">set_if_none</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">value</span>: <span class="ident">T</span>) { <span class="kw">if</span> <span class="self">self</span>.<span class="ident">value</span>.<span class="ident">is_none</span>() { <span class="self">self</span>.<span class="ident">value</span> <span class="op">=</span> <span class="prelude-val">Some</span>(<span class="ident">value</span>); } } <span class="kw">fn</span> <span class="ident">get</span>(<span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> { <span class="self">self</span>.<span class="ident">value</span> } } <span class="kw">struct</span> <span class="ident">BoolAttr</span><span class="op"><</span><span class="lifetime">'c</span><span class="op">></span>(<span class="ident">Attr</span><span class="op"><</span><span class="lifetime">'c</span>, ()<span class="op">></span>); <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'c</span><span class="op">></span> <span class="ident">BoolAttr</span><span class="op"><</span><span class="lifetime">'c</span><span class="op">></span> { <span class="kw">fn</span> <span class="ident">none</span>(<span class="ident">cx</span>: <span class="kw-2">&</span><span class="lifetime">'c</span> <span class="ident">Ctxt</span>, <span class="ident">name</span>: <span class="kw-2">&</span><span class="lifetime">'static</span> <span class="ident">str</span>) <span class="op">-></span> <span class="self">Self</span> { <span class="ident">BoolAttr</span>(<span class="ident">Attr</span>::<span class="ident">none</span>(<span class="ident">cx</span>, <span class="ident">name</span>)) } <span class="kw">fn</span> <span class="ident">set_true</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) { <span class="self">self</span>.<span class="number">0</span>.<span class="ident">set</span>(()); } <span class="kw">fn</span> <span class="ident">get</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">bool</span> { <span class="self">self</span>.<span class="number">0</span>.<span class="ident">value</span>.<span class="ident">is_some</span>() } } <span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>)]</span> <span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Name</span> { <span class="ident">serialize</span>: <span class="ident">String</span>, <span class="ident">deserialize</span>: <span class="ident">String</span>, } <span class="kw">impl</span> <span class="ident">Name</span> { <span class="doccomment">/// Return the container name for the container when serializing.</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">serialize_name</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">String</span> { <span class="self">self</span>.<span class="ident">serialize</span>.<span class="ident">clone</span>() } <span class="doccomment">/// Return the container name for the container when deserializing.</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">deserialize_name</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">String</span> { <span class="self">self</span>.<span class="ident">deserialize</span>.<span class="ident">clone</span>() } } <span class="doccomment">/// Represents container (e.g. struct) attribute information</span> <span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>)]</span> <span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Container</span> { <span class="ident">name</span>: <span class="ident">Name</span>, <span class="ident">deny_unknown_fields</span>: <span class="ident">bool</span>, <span class="ident">default</span>: <span class="ident">Default</span>, <span class="ident">rename_all</span>: <span class="ident">RenameRule</span>, <span class="ident">ser_bound</span>: <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">Vec</span><span class="op"><</span><span class="ident">syn</span>::<span class="ident">WherePredicate</span><span class="op">>></span>, <span class="ident">de_bound</span>: <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">Vec</span><span class="op"><</span><span class="ident">syn</span>::<span class="ident">WherePredicate</span><span class="op">>></span>, <span class="ident">tag</span>: <span class="ident">EnumTag</span>, <span class="ident">from_type</span>: <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">syn</span>::<span class="ident">Ty</span><span class="op">></span>, <span class="ident">into_type</span>: <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">syn</span>::<span class="ident">Ty</span><span class="op">></span>, <span class="ident">remote</span>: <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">syn</span>::<span class="ident">Path</span><span class="op">></span>, <span class="ident">identifier</span>: <span class="ident">Identifier</span>, } <span class="doccomment">/// Styles of representing an enum.</span> <span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>)]</span> <span class="kw">pub</span> <span class="kw">enum</span> <span class="ident">EnumTag</span> { <span class="doccomment">/// The default.</span> <span class="doccomment">///</span> <span class="doccomment">/// ```json</span> <span class="doccomment">/// {"variant1": {"key1": "value1", "key2": "value2"}}</span> <span class="doccomment">/// ```</span> <span class="ident">External</span>, <span class="doccomment">/// `#[serde(tag = "type")]`</span> <span class="doccomment">///</span> <span class="doccomment">/// ```json</span> <span class="doccomment">/// {"type": "variant1", "key1": "value1", "key2": "value2"}</span> <span class="doccomment">/// ```</span> <span class="ident">Internal</span> { <span class="ident">tag</span>: <span class="ident">String</span> }, <span class="doccomment">/// `#[serde(tag = "t", content = "c")]`</span> <span class="doccomment">///</span> <span class="doccomment">/// ```json</span> <span class="doccomment">/// {"t": "variant1", "c": {"key1": "value1", "key2": "value2"}}</span> <span class="doccomment">/// ```</span> <span class="ident">Adjacent</span> { <span class="ident">tag</span>: <span class="ident">String</span>, <span class="ident">content</span>: <span class="ident">String</span> }, <span class="doccomment">/// `#[serde(untagged)]`</span> <span class="doccomment">///</span> <span class="doccomment">/// ```json</span> <span class="doccomment">/// {"key1": "value1", "key2": "value2"}</span> <span class="doccomment">/// ```</span> <span class="prelude-val">None</span>, } <span class="doccomment">/// Whether this enum represents the fields of a struct or the variants of an</span> <span class="doccomment">/// enum.</span> <span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Copy</span>, <span class="ident">Clone</span>, <span class="ident">Debug</span>)]</span> <span class="kw">pub</span> <span class="kw">enum</span> <span class="ident">Identifier</span> { <span class="doccomment">/// It does not.</span> <span class="ident">No</span>, <span class="doccomment">/// This enum represents the fields of a struct. All of the variants must be</span> <span class="doccomment">/// unit variants, except possibly one which is annotated with</span> <span class="doccomment">/// `#[serde(other)]` and is a newtype variant.</span> <span class="ident">Field</span>, <span class="doccomment">/// This enum represents the variants of an enum. All of the variants must</span> <span class="doccomment">/// be unit variants.</span> <span class="ident">Variant</span>, } <span class="kw">impl</span> <span class="ident">Container</span> { <span class="doccomment">/// Extract out the `#[serde(...)]` attributes from an item.</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">from_ast</span>(<span class="ident">cx</span>: <span class="kw-2">&</span><span class="ident">Ctxt</span>, <span class="ident">item</span>: <span class="kw-2">&</span><span class="ident">syn</span>::<span class="ident">DeriveInput</span>) <span class="op">-></span> <span class="self">Self</span> { <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">ser_name</span> <span class="op">=</span> <span class="ident">Attr</span>::<span class="ident">none</span>(<span class="ident">cx</span>, <span class="string">"rename"</span>); <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">de_name</span> <span class="op">=</span> <span class="ident">Attr</span>::<span class="ident">none</span>(<span class="ident">cx</span>, <span class="string">"rename"</span>); <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">deny_unknown_fields</span> <span class="op">=</span> <span class="ident">BoolAttr</span>::<span class="ident">none</span>(<span class="ident">cx</span>, <span class="string">"deny_unknown_fields"</span>); <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">default</span> <span class="op">=</span> <span class="ident">Attr</span>::<span class="ident">none</span>(<span class="ident">cx</span>, <span class="string">"default"</span>); <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">rename_all</span> <span class="op">=</span> <span class="ident">Attr</span>::<span class="ident">none</span>(<span class="ident">cx</span>, <span class="string">"rename_all"</span>); <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">ser_bound</span> <span class="op">=</span> <span class="ident">Attr</span>::<span class="ident">none</span>(<span class="ident">cx</span>, <span class="string">"bound"</span>); <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">de_bound</span> <span class="op">=</span> <span class="ident">Attr</span>::<span class="ident">none</span>(<span class="ident">cx</span>, <span class="string">"bound"</span>); <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">untagged</span> <span class="op">=</span> <span class="ident">BoolAttr</span>::<span class="ident">none</span>(<span class="ident">cx</span>, <span class="string">"untagged"</span>); <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">internal_tag</span> <span class="op">=</span> <span class="ident">Attr</span>::<span class="ident">none</span>(<span class="ident">cx</span>, <span class="string">"tag"</span>); <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">content</span> <span class="op">=</span> <span class="ident">Attr</span>::<span class="ident">none</span>(<span class="ident">cx</span>, <span class="string">"content"</span>); <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">from_type</span> <span class="op">=</span> <span class="ident">Attr</span>::<span class="ident">none</span>(<span class="ident">cx</span>, <span class="string">"from"</span>); <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">into_type</span> <span class="op">=</span> <span class="ident">Attr</span>::<span class="ident">none</span>(<span class="ident">cx</span>, <span class="string">"into"</span>); <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">remote</span> <span class="op">=</span> <span class="ident">Attr</span>::<span class="ident">none</span>(<span class="ident">cx</span>, <span class="string">"remote"</span>); <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">field_identifier</span> <span class="op">=</span> <span class="ident">BoolAttr</span>::<span class="ident">none</span>(<span class="ident">cx</span>, <span class="string">"field_identifier"</span>); <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">variant_identifier</span> <span class="op">=</span> <span class="ident">BoolAttr</span>::<span class="ident">none</span>(<span class="ident">cx</span>, <span class="string">"variant_identifier"</span>); <span class="kw">for</span> <span class="ident">meta_items</span> <span class="kw">in</span> <span class="ident">item</span>.<span class="ident">attrs</span>.<span class="ident">iter</span>().<span class="ident">filter_map</span>(<span class="ident">get_serde_meta_items</span>) { <span class="kw">for</span> <span class="ident">meta_item</span> <span class="kw">in</span> <span class="ident">meta_items</span> { <span class="kw">match</span> <span class="ident">meta_item</span> { <span class="comment">// Parse `#[serde(rename = "foo")]`</span> <span class="ident">MetaItem</span>(<span class="ident">NameValue</span>(<span class="kw-2">ref</span> <span class="ident">name</span>, <span class="kw-2">ref</span> <span class="ident">lit</span>)) <span class="kw">if</span> <span class="ident">name</span> <span class="op">==</span> <span class="string">"rename"</span> <span class="op">=></span> { <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Ok</span>(<span class="ident">s</span>) <span class="op">=</span> <span class="ident">get_string_from_lit</span>(<span class="ident">cx</span>, <span class="ident">name</span>.<span class="ident">as_ref</span>(), <span class="ident">name</span>.<span class="ident">as_ref</span>(), <span class="ident">lit</span>) { <span class="ident">ser_name</span>.<span class="ident">set</span>(<span class="ident">s</span>.<span class="ident">clone</span>()); <span class="ident">de_name</span>.<span class="ident">set</span>(<span class="ident">s</span>); } } <span class="comment">// Parse `#[serde(rename(serialize = "foo", deserialize = "bar"))]`</span> <span class="ident">MetaItem</span>(<span class="ident">List</span>(<span class="kw-2">ref</span> <span class="ident">name</span>, <span class="kw-2">ref</span> <span class="ident">meta_items</span>)) <span class="kw">if</span> <span class="ident">name</span> <span class="op">==</span> <span class="string">"rename"</span> <span class="op">=></span> { <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Ok</span>((<span class="ident">ser</span>, <span class="ident">de</span>)) <span class="op">=</span> <span class="ident">get_renames</span>(<span class="ident">cx</span>, <span class="ident">meta_items</span>) { <span class="ident">ser_name</span>.<span class="ident">set_opt</span>(<span class="ident">ser</span>); <span class="ident">de_name</span>.<span class="ident">set_opt</span>(<span class="ident">de</span>); } } <span class="comment">// Parse `#[serde(rename_all = "foo")]`</span> <span class="ident">MetaItem</span>(<span class="ident">NameValue</span>(<span class="kw-2">ref</span> <span class="ident">name</span>, <span class="kw-2">ref</span> <span class="ident">lit</span>)) <span class="kw">if</span> <span class="ident">name</span> <span class="op">==</span> <span class="string">"rename_all"</span> <span class="op">=></span> { <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Ok</span>(<span class="ident">s</span>) <span class="op">=</span> <span class="ident">get_string_from_lit</span>(<span class="ident">cx</span>, <span class="ident">name</span>.<span class="ident">as_ref</span>(), <span class="ident">name</span>.<span class="ident">as_ref</span>(), <span class="ident">lit</span>) { <span class="kw">match</span> <span class="ident">RenameRule</span>::<span class="ident">from_str</span>(<span class="kw-2">&</span><span class="ident">s</span>) { <span class="prelude-val">Ok</span>(<span class="ident">rename_rule</span>) <span class="op">=></span> <span class="ident">rename_all</span>.<span class="ident">set</span>(<span class="ident">rename_rule</span>), <span class="prelude-val">Err</span>(()) <span class="op">=></span> { <span class="ident">cx</span>.<span class="ident">error</span>(<span class="macro">format</span><span class="macro">!</span>(<span class="string">"unknown rename rule for #[serde(rename_all \ = {:?})]"</span>, <span class="ident">s</span>)) } } } } <span class="comment">// Parse `#[serde(deny_unknown_fields)]`</span> <span class="ident">MetaItem</span>(<span class="ident">Word</span>(<span class="kw-2">ref</span> <span class="ident">name</span>)) <span class="kw">if</span> <span class="ident">name</span> <span class="op">==</span> <span class="string">"deny_unknown_fields"</span> <span class="op">=></span> { <span class="ident">deny_unknown_fields</span>.<span class="ident">set_true</span>(); } <span class="comment">// Parse `#[serde(default)]`</span> <span class="ident">MetaItem</span>(<span class="ident">Word</span>(<span class="kw-2">ref</span> <span class="ident">name</span>)) <span class="kw">if</span> <span class="ident">name</span> <span class="op">==</span> <span class="string">"default"</span> <span class="op">=></span> { <span class="kw">match</span> <span class="ident">item</span>.<span class="ident">body</span> { <span class="ident">syn</span>::<span class="ident">Body</span>::<span class="ident">Struct</span>(<span class="ident">syn</span>::<span class="ident">VariantData</span>::<span class="ident">Struct</span>(_)) <span class="op">=></span> { <span class="ident">default</span>.<span class="ident">set</span>(<span class="ident">Default</span>::<span class="ident">Default</span>); } _ <span class="op">=></span> { <span class="ident">cx</span>.<span class="ident">error</span>( <span class="string">"#[serde(default)] can only be used on structs \ with named fields"</span>, ) } } } <span class="comment">// Parse `#[serde(default = "...")]`</span> <span class="ident">MetaItem</span>(<span class="ident">NameValue</span>(<span class="kw-2">ref</span> <span class="ident">name</span>, <span class="kw-2">ref</span> <span class="ident">lit</span>)) <span class="kw">if</span> <span class="ident">name</span> <span class="op">==</span> <span class="string">"default"</span> <span class="op">=></span> { <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Ok</span>(<span class="ident">path</span>) <span class="op">=</span> <span class="ident">parse_lit_into_path</span>(<span class="ident">cx</span>, <span class="ident">name</span>.<span class="ident">as_ref</span>(), <span class="ident">lit</span>) { <span class="kw">match</span> <span class="ident">item</span>.<span class="ident">body</span> { <span class="ident">syn</span>::<span class="ident">Body</span>::<span class="ident">Struct</span>(<span class="ident">syn</span>::<span class="ident">VariantData</span>::<span class="ident">Struct</span>(_)) <span class="op">=></span> { <span class="ident">default</span>.<span class="ident">set</span>(<span class="ident">Default</span>::<span class="ident">Path</span>(<span class="ident">path</span>)); } _ <span class="op">=></span> { <span class="ident">cx</span>.<span class="ident">error</span>( <span class="string">"#[serde(default = \"...\")] can only be used \ on structs with named fields"</span>, ) } } } } <span class="comment">// Parse `#[serde(bound = "D: Serialize")]`</span> <span class="ident">MetaItem</span>(<span class="ident">NameValue</span>(<span class="kw-2">ref</span> <span class="ident">name</span>, <span class="kw-2">ref</span> <span class="ident">lit</span>)) <span class="kw">if</span> <span class="ident">name</span> <span class="op">==</span> <span class="string">"bound"</span> <span class="op">=></span> { <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Ok</span>(<span class="ident">where_predicates</span>) <span class="op">=</span> <span class="ident">parse_lit_into_where</span>(<span class="ident">cx</span>, <span class="ident">name</span>.<span class="ident">as_ref</span>(), <span class="ident">name</span>.<span class="ident">as_ref</span>(), <span class="ident">lit</span>) { <span class="ident">ser_bound</span>.<span class="ident">set</span>(<span class="ident">where_predicates</span>.<span class="ident">clone</span>()); <span class="ident">de_bound</span>.<span class="ident">set</span>(<span class="ident">where_predicates</span>); } } <span class="comment">// Parse `#[serde(bound(serialize = "D: Serialize", deserialize = "D: Deserialize"))]`</span> <span class="ident">MetaItem</span>(<span class="ident">List</span>(<span class="kw-2">ref</span> <span class="ident">name</span>, <span class="kw-2">ref</span> <span class="ident">meta_items</span>)) <span class="kw">if</span> <span class="ident">name</span> <span class="op">==</span> <span class="string">"bound"</span> <span class="op">=></span> { <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Ok</span>((<span class="ident">ser</span>, <span class="ident">de</span>)) <span class="op">=</span> <span class="ident">get_where_predicates</span>(<span class="ident">cx</span>, <span class="ident">meta_items</span>) { <span class="ident">ser_bound</span>.<span class="ident">set_opt</span>(<span class="ident">ser</span>); <span class="ident">de_bound</span>.<span class="ident">set_opt</span>(<span class="ident">de</span>); } } <span class="comment">// Parse `#[serde(untagged)]`</span> <span class="ident">MetaItem</span>(<span class="ident">Word</span>(<span class="kw-2">ref</span> <span class="ident">name</span>)) <span class="kw">if</span> <span class="ident">name</span> <span class="op">==</span> <span class="string">"untagged"</span> <span class="op">=></span> { <span class="kw">match</span> <span class="ident">item</span>.<span class="ident">body</span> { <span class="ident">syn</span>::<span class="ident">Body</span>::<span class="ident">Enum</span>(_) <span class="op">=></span> { <span class="ident">untagged</span>.<span class="ident">set_true</span>(); } <span class="ident">syn</span>::<span class="ident">Body</span>::<span class="ident">Struct</span>(_) <span class="op">=></span> { <span class="ident">cx</span>.<span class="ident">error</span>(<span class="string">"#[serde(untagged)] can only be used on enums"</span>) } } } <span class="comment">// Parse `#[serde(tag = "type")]`</span> <span class="ident">MetaItem</span>(<span class="ident">NameValue</span>(<span class="kw-2">ref</span> <span class="ident">name</span>, <span class="kw-2">ref</span> <span class="ident">lit</span>)) <span class="kw">if</span> <span class="ident">name</span> <span class="op">==</span> <span class="string">"tag"</span> <span class="op">=></span> { <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Ok</span>(<span class="ident">s</span>) <span class="op">=</span> <span class="ident">get_string_from_lit</span>(<span class="ident">cx</span>, <span class="ident">name</span>.<span class="ident">as_ref</span>(), <span class="ident">name</span>.<span class="ident">as_ref</span>(), <span class="ident">lit</span>) { <span class="kw">match</span> <span class="ident">item</span>.<span class="ident">body</span> { <span class="ident">syn</span>::<span class="ident">Body</span>::<span class="ident">Enum</span>(_) <span class="op">=></span> { <span class="ident">internal_tag</span>.<span class="ident">set</span>(<span class="ident">s</span>); } <span class="ident">syn</span>::<span class="ident">Body</span>::<span class="ident">Struct</span>(_) <span class="op">=></span> { <span class="ident">cx</span>.<span class="ident">error</span>(<span class="string">"#[serde(tag = \"...\")] can only be used on enums"</span>) } } } } <span class="comment">// Parse `#[serde(content = "c")]`</span> <span class="ident">MetaItem</span>(<span class="ident">NameValue</span>(<span class="kw-2">ref</span> <span class="ident">name</span>, <span class="kw-2">ref</span> <span class="ident">lit</span>)) <span class="kw">if</span> <span class="ident">name</span> <span class="op">==</span> <span class="string">"content"</span> <span class="op">=></span> { <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Ok</span>(<span class="ident">s</span>) <span class="op">=</span> <span class="ident">get_string_from_lit</span>(<span class="ident">cx</span>, <span class="ident">name</span>.<span class="ident">as_ref</span>(), <span class="ident">name</span>.<span class="ident">as_ref</span>(), <span class="ident">lit</span>) { <span class="kw">match</span> <span class="ident">item</span>.<span class="ident">body</span> { <span class="ident">syn</span>::<span class="ident">Body</span>::<span class="ident">Enum</span>(_) <span class="op">=></span> { <span class="ident">content</span>.<span class="ident">set</span>(<span class="ident">s</span>); } <span class="ident">syn</span>::<span class="ident">Body</span>::<span class="ident">Struct</span>(_) <span class="op">=></span> { <span class="ident">cx</span>.<span class="ident">error</span>( <span class="string">"#[serde(content = \"...\")] can only be used on \ enums"</span>, ) } } } } <span class="comment">// Parse `#[serde(from = "Type")]</span> <span class="ident">MetaItem</span>(<span class="ident">NameValue</span>(<span class="kw-2">ref</span> <span class="ident">name</span>, <span class="kw-2">ref</span> <span class="ident">lit</span>)) <span class="kw">if</span> <span class="ident">name</span> <span class="op">==</span> <span class="string">"from"</span> <span class="op">=></span> { <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Ok</span>(<span class="ident">from_ty</span>) <span class="op">=</span> <span class="ident">parse_lit_into_ty</span>(<span class="ident">cx</span>, <span class="ident">name</span>.<span class="ident">as_ref</span>(), <span class="ident">lit</span>) { <span class="ident">from_type</span>.<span class="ident">set_opt</span>(<span class="prelude-val">Some</span>(<span class="ident">from_ty</span>)); } } <span class="comment">// Parse `#[serde(into = "Type")]</span> <span class="ident">MetaItem</span>(<span class="ident">NameValue</span>(<span class="kw-2">ref</span> <span class="ident">name</span>, <span class="kw-2">ref</span> <span class="ident">lit</span>)) <span class="kw">if</span> <span class="ident">name</span> <span class="op">==</span> <span class="string">"into"</span> <span class="op">=></span> { <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Ok</span>(<span class="ident">into_ty</span>) <span class="op">=</span> <span class="ident">parse_lit_into_ty</span>(<span class="ident">cx</span>, <span class="ident">name</span>.<span class="ident">as_ref</span>(), <span class="ident">lit</span>) { <span class="ident">into_type</span>.<span class="ident">set_opt</span>(<span class="prelude-val">Some</span>(<span class="ident">into_ty</span>)); } } <span class="comment">// Parse `#[serde(remote = "...")]`</span> <span class="ident">MetaItem</span>(<span class="ident">NameValue</span>(<span class="kw-2">ref</span> <span class="ident">name</span>, <span class="kw-2">ref</span> <span class="ident">lit</span>)) <span class="kw">if</span> <span class="ident">name</span> <span class="op">==</span> <span class="string">"remote"</span> <span class="op">=></span> { <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Ok</span>(<span class="ident">path</span>) <span class="op">=</span> <span class="ident">parse_lit_into_path</span>(<span class="ident">cx</span>, <span class="ident">name</span>.<span class="ident">as_ref</span>(), <span class="ident">lit</span>) { <span class="ident">remote</span>.<span class="ident">set</span>(<span class="ident">path</span>); } } <span class="comment">// Parse `#[serde(field_identifier)]`</span> <span class="ident">MetaItem</span>(<span class="ident">Word</span>(<span class="kw-2">ref</span> <span class="ident">name</span>)) <span class="kw">if</span> <span class="ident">name</span> <span class="op">==</span> <span class="string">"field_identifier"</span> <span class="op">=></span> { <span class="ident">field_identifier</span>.<span class="ident">set_true</span>(); } <span class="comment">// Parse `#[serde(variant_identifier)]`</span> <span class="ident">MetaItem</span>(<span class="ident">Word</span>(<span class="kw-2">ref</span> <span class="ident">name</span>)) <span class="kw">if</span> <span class="ident">name</span> <span class="op">==</span> <span class="string">"variant_identifier"</span> <span class="op">=></span> { <span class="ident">variant_identifier</span>.<span class="ident">set_true</span>(); } <span class="ident">MetaItem</span>(<span class="kw-2">ref</span> <span class="ident">meta_item</span>) <span class="op">=></span> { <span class="ident">cx</span>.<span class="ident">error</span>(<span class="macro">format</span><span class="macro">!</span>(<span class="string">"unknown serde container attribute `{}`"</span>, <span class="ident">meta_item</span>.<span class="ident">name</span>())); } <span class="ident">Literal</span>(_) <span class="op">=></span> { <span class="ident">cx</span>.<span class="ident">error</span>(<span class="string">"unexpected literal in serde container attribute"</span>); } } } } <span class="ident">Container</span> { <span class="ident">name</span>: <span class="ident">Name</span> { <span class="ident">serialize</span>: <span class="ident">ser_name</span>.<span class="ident">get</span>().<span class="ident">unwrap_or_else</span>(<span class="op">||</span> <span class="ident">item</span>.<span class="ident">ident</span>.<span class="ident">to_string</span>()), <span class="ident">deserialize</span>: <span class="ident">de_name</span>.<span class="ident">get</span>().<span class="ident">unwrap_or_else</span>(<span class="op">||</span> <span class="ident">item</span>.<span class="ident">ident</span>.<span class="ident">to_string</span>()), }, <span class="ident">deny_unknown_fields</span>: <span class="ident">deny_unknown_fields</span>.<span class="ident">get</span>(), <span class="ident">default</span>: <span class="ident">default</span>.<span class="ident">get</span>().<span class="ident">unwrap_or</span>(<span class="ident">Default</span>::<span class="prelude-val">None</span>), <span class="ident">rename_all</span>: <span class="ident">rename_all</span>.<span class="ident">get</span>().<span class="ident">unwrap_or</span>(<span class="ident">RenameRule</span>::<span class="prelude-val">None</span>), <span class="ident">ser_bound</span>: <span class="ident">ser_bound</span>.<span class="ident">get</span>(), <span class="ident">de_bound</span>: <span class="ident">de_bound</span>.<span class="ident">get</span>(), <span class="ident">tag</span>: <span class="ident">decide_tag</span>(<span class="ident">cx</span>, <span class="ident">item</span>, <span class="ident">untagged</span>, <span class="ident">internal_tag</span>, <span class="ident">content</span>), <span class="ident">from_type</span>: <span class="ident">from_type</span>.<span class="ident">get</span>(), <span class="ident">into_type</span>: <span class="ident">into_type</span>.<span class="ident">get</span>(), <span class="ident">remote</span>: <span class="ident">remote</span>.<span class="ident">get</span>(), <span class="ident">identifier</span>: <span class="ident">decide_identifier</span>(<span class="ident">cx</span>, <span class="ident">item</span>, <span class="ident">field_identifier</span>, <span class="ident">variant_identifier</span>), } } <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">name</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="ident">Name</span> { <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">name</span> } <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">rename_all</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="ident">RenameRule</span> { <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">rename_all</span> } <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">deny_unknown_fields</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">bool</span> { <span class="self">self</span>.<span class="ident">deny_unknown_fields</span> } <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">default</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="ident">Default</span> { <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">default</span> } <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">ser_bound</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span>[<span class="ident">syn</span>::<span class="ident">WherePredicate</span>]<span class="op">></span> { <span class="self">self</span>.<span class="ident">ser_bound</span>.<span class="ident">as_ref</span>().<span class="ident">map</span>(<span class="op">|</span><span class="ident">vec</span><span class="op">|</span> <span class="kw-2">&</span><span class="ident">vec</span>[..]) } <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">de_bound</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span>[<span class="ident">syn</span>::<span class="ident">WherePredicate</span>]<span class="op">></span> { <span class="self">self</span>.<span class="ident">de_bound</span>.<span class="ident">as_ref</span>().<span class="ident">map</span>(<span class="op">|</span><span class="ident">vec</span><span class="op">|</span> <span class="kw-2">&</span><span class="ident">vec</span>[..]) } <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">tag</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="ident">EnumTag</span> { <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">tag</span> } <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">from_type</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="ident">syn</span>::<span class="ident">Ty</span><span class="op">></span> { <span class="self">self</span>.<span class="ident">from_type</span>.<span class="ident">as_ref</span>() } <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">into_type</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="ident">syn</span>::<span class="ident">Ty</span><span class="op">></span> { <span class="self">self</span>.<span class="ident">into_type</span>.<span class="ident">as_ref</span>() } <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">remote</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="ident">syn</span>::<span class="ident">Path</span><span class="op">></span> { <span class="self">self</span>.<span class="ident">remote</span>.<span class="ident">as_ref</span>() } <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">identifier</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">Identifier</span> { <span class="self">self</span>.<span class="ident">identifier</span> } } <span class="kw">fn</span> <span class="ident">decide_tag</span>( <span class="ident">cx</span>: <span class="kw-2">&</span><span class="ident">Ctxt</span>, <span class="ident">item</span>: <span class="kw-2">&</span><span class="ident">syn</span>::<span class="ident">DeriveInput</span>, <span class="ident">untagged</span>: <span class="ident">BoolAttr</span>, <span class="ident">internal_tag</span>: <span class="ident">Attr</span><span class="op"><</span><span class="ident">String</span><span class="op">></span>, <span class="ident">content</span>: <span class="ident">Attr</span><span class="op"><</span><span class="ident">String</span><span class="op">></span>, ) <span class="op">-></span> <span class="ident">EnumTag</span> { <span class="kw">match</span> (<span class="ident">untagged</span>.<span class="ident">get</span>(), <span class="ident">internal_tag</span>.<span class="ident">get</span>(), <span class="ident">content</span>.<span class="ident">get</span>()) { (<span class="bool-val">false</span>, <span class="prelude-val">None</span>, <span class="prelude-val">None</span>) <span class="op">=></span> <span class="ident">EnumTag</span>::<span class="ident">External</span>, (<span class="bool-val">true</span>, <span class="prelude-val">None</span>, <span class="prelude-val">None</span>) <span class="op">=></span> <span class="ident">EnumTag</span>::<span class="prelude-val">None</span>, (<span class="bool-val">false</span>, <span class="prelude-val">Some</span>(<span class="ident">tag</span>), <span class="prelude-val">None</span>) <span class="op">=></span> { <span class="comment">// Check that there are no tuple variants.</span> <span class="kw">if</span> <span class="kw">let</span> <span class="ident">syn</span>::<span class="ident">Body</span>::<span class="ident">Enum</span>(<span class="kw-2">ref</span> <span class="ident">variants</span>) <span class="op">=</span> <span class="ident">item</span>.<span class="ident">body</span> { <span class="kw">for</span> <span class="ident">variant</span> <span class="kw">in</span> <span class="ident">variants</span> { <span class="kw">match</span> <span class="ident">variant</span>.<span class="ident">data</span> { <span class="ident">syn</span>::<span class="ident">VariantData</span>::<span class="ident">Struct</span>(_) <span class="op">|</span> <span class="ident">syn</span>::<span class="ident">VariantData</span>::<span class="ident">Unit</span> <span class="op">=></span> {} <span class="ident">syn</span>::<span class="ident">VariantData</span>::<span class="ident">Tuple</span>(<span class="kw-2">ref</span> <span class="ident">fields</span>) <span class="op">=></span> { <span class="kw">if</span> <span class="ident">fields</span>.<span class="ident">len</span>() <span class="op">!=</span> <span class="number">1</span> { <span class="ident">cx</span>.<span class="ident">error</span>( <span class="string">"#[serde(tag = \"...\")] cannot be used with tuple \ variants"</span>, ); <span class="kw">break</span>; } } } } } <span class="ident">EnumTag</span>::<span class="ident">Internal</span> { <span class="ident">tag</span>: <span class="ident">tag</span> } } (<span class="bool-val">true</span>, <span class="prelude-val">Some</span>(_), <span class="prelude-val">None</span>) <span class="op">=></span> { <span class="ident">cx</span>.<span class="ident">error</span>(<span class="string">"enum cannot be both untagged and internally tagged"</span>); <span class="ident">EnumTag</span>::<span class="ident">External</span> <span class="comment">// doesn't matter, will error</span> } (<span class="bool-val">false</span>, <span class="prelude-val">None</span>, <span class="prelude-val">Some</span>(_)) <span class="op">=></span> { <span class="ident">cx</span>.<span class="ident">error</span>(<span class="string">"#[serde(tag = \"...\", content = \"...\")] must be used together"</span>,); <span class="ident">EnumTag</span>::<span class="ident">External</span> } (<span class="bool-val">true</span>, <span class="prelude-val">None</span>, <span class="prelude-val">Some</span>(_)) <span class="op">=></span> { <span class="ident">cx</span>.<span class="ident">error</span>(<span class="string">"untagged enum cannot have #[serde(content = \"...\")]"</span>); <span class="ident">EnumTag</span>::<span class="ident">External</span> } (<span class="bool-val">false</span>, <span class="prelude-val">Some</span>(<span class="ident">tag</span>), <span class="prelude-val">Some</span>(<span class="ident">content</span>)) <span class="op">=></span> { <span class="ident">EnumTag</span>::<span class="ident">Adjacent</span> { <span class="ident">tag</span>: <span class="ident">tag</span>, <span class="ident">content</span>: <span class="ident">content</span>, } } (<span class="bool-val">true</span>, <span class="prelude-val">Some</span>(_), <span class="prelude-val">Some</span>(_)) <span class="op">=></span> { <span class="ident">cx</span>.<span class="ident">error</span>(<span class="string">"untagged enum cannot have #[serde(tag = \"...\", content = \"...\")]"</span>,); <span class="ident">EnumTag</span>::<span class="ident">External</span> } } } <span class="kw">fn</span> <span class="ident">decide_identifier</span>( <span class="ident">cx</span>: <span class="kw-2">&</span><span class="ident">Ctxt</span>, <span class="ident">item</span>: <span class="kw-2">&</span><span class="ident">syn</span>::<span class="ident">DeriveInput</span>, <span class="ident">field_identifier</span>: <span class="ident">BoolAttr</span>, <span class="ident">variant_identifier</span>: <span class="ident">BoolAttr</span>, ) <span class="op">-></span> <span class="ident">Identifier</span> { <span class="kw">match</span> (<span class="kw-2">&</span><span class="ident">item</span>.<span class="ident">body</span>, <span class="ident">field_identifier</span>.<span class="ident">get</span>(), <span class="ident">variant_identifier</span>.<span class="ident">get</span>()) { (_, <span class="bool-val">false</span>, <span class="bool-val">false</span>) <span class="op">=></span> <span class="ident">Identifier</span>::<span class="ident">No</span>, (_, <span class="bool-val">true</span>, <span class="bool-val">true</span>) <span class="op">=></span> { <span class="ident">cx</span>.<span class="ident">error</span>(<span class="string">"`field_identifier` and `variant_identifier` cannot both be set"</span>,); <span class="ident">Identifier</span>::<span class="ident">No</span> } (<span class="kw-2">&</span><span class="ident">syn</span>::<span class="ident">Body</span>::<span class="ident">Struct</span>(_), <span class="bool-val">true</span>, <span class="bool-val">false</span>) <span class="op">=></span> { <span class="ident">cx</span>.<span class="ident">error</span>(<span class="string">"`field_identifier` can only be used on an enum"</span>); <span class="ident">Identifier</span>::<span class="ident">No</span> } (<span class="kw-2">&</span><span class="ident">syn</span>::<span class="ident">Body</span>::<span class="ident">Struct</span>(_), <span class="bool-val">false</span>, <span class="bool-val">true</span>) <span class="op">=></span> { <span class="ident">cx</span>.<span class="ident">error</span>(<span class="string">"`variant_identifier` can only be used on an enum"</span>); <span class="ident">Identifier</span>::<span class="ident">No</span> } (<span class="kw-2">&</span><span class="ident">syn</span>::<span class="ident">Body</span>::<span class="ident">Enum</span>(_), <span class="bool-val">true</span>, <span class="bool-val">false</span>) <span class="op">=></span> <span class="ident">Identifier</span>::<span class="ident">Field</span>, (<span class="kw-2">&</span><span class="ident">syn</span>::<span class="ident">Body</span>::<span class="ident">Enum</span>(_), <span class="bool-val">false</span>, <span class="bool-val">true</span>) <span class="op">=></span> <span class="ident">Identifier</span>::<span class="ident">Variant</span>, } } <span class="doccomment">/// Represents variant attribute information</span> <span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>)]</span> <span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Variant</span> { <span class="ident">name</span>: <span class="ident">Name</span>, <span class="ident">ser_renamed</span>: <span class="ident">bool</span>, <span class="ident">de_renamed</span>: <span class="ident">bool</span>, <span class="ident">rename_all</span>: <span class="ident">RenameRule</span>, <span class="ident">skip_deserializing</span>: <span class="ident">bool</span>, <span class="ident">skip_serializing</span>: <span class="ident">bool</span>, <span class="ident">other</span>: <span class="ident">bool</span>, } <span class="kw">impl</span> <span class="ident">Variant</span> { <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">from_ast</span>(<span class="ident">cx</span>: <span class="kw-2">&</span><span class="ident">Ctxt</span>, <span class="ident">variant</span>: <span class="kw-2">&</span><span class="ident">syn</span>::<span class="ident">Variant</span>) <span class="op">-></span> <span class="self">Self</span> { <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">ser_name</span> <span class="op">=</span> <span class="ident">Attr</span>::<span class="ident">none</span>(<span class="ident">cx</span>, <span class="string">"rename"</span>); <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">de_name</span> <span class="op">=</span> <span class="ident">Attr</span>::<span class="ident">none</span>(<span class="ident">cx</span>, <span class="string">"rename"</span>); <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">skip_deserializing</span> <span class="op">=</span> <span class="ident">BoolAttr</span>::<span class="ident">none</span>(<span class="ident">cx</span>, <span class="string">"skip_deserializing"</span>); <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">skip_serializing</span> <span class="op">=</span> <span class="ident">BoolAttr</span>::<span class="ident">none</span>(<span class="ident">cx</span>, <span class="string">"skip_serializing"</span>); <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">rename_all</span> <span class="op">=</span> <span class="ident">Attr</span>::<span class="ident">none</span>(<span class="ident">cx</span>, <span class="string">"rename_all"</span>); <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">other</span> <span class="op">=</span> <span class="ident">BoolAttr</span>::<span class="ident">none</span>(<span class="ident">cx</span>, <span class="string">"other"</span>); <span class="kw">for</span> <span class="ident">meta_items</span> <span class="kw">in</span> <span class="ident">variant</span>.<span class="ident">attrs</span>.<span class="ident">iter</span>().<span class="ident">filter_map</span>(<span class="ident">get_serde_meta_items</span>) { <span class="kw">for</span> <span class="ident">meta_item</span> <span class="kw">in</span> <span class="ident">meta_items</span> { <span class="kw">match</span> <span class="ident">meta_item</span> { <span class="comment">// Parse `#[serde(rename = "foo")]`</span> <span class="ident">MetaItem</span>(<span class="ident">NameValue</span>(<span class="kw-2">ref</span> <span class="ident">name</span>, <span class="kw-2">ref</span> <span class="ident">lit</span>)) <span class="kw">if</span> <span class="ident">name</span> <span class="op">==</span> <span class="string">"rename"</span> <span class="op">=></span> { <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Ok</span>(<span class="ident">s</span>) <span class="op">=</span> <span class="ident">get_string_from_lit</span>(<span class="ident">cx</span>, <span class="ident">name</span>.<span class="ident">as_ref</span>(), <span class="ident">name</span>.<span class="ident">as_ref</span>(), <span class="ident">lit</span>) { <span class="ident">ser_name</span>.<span class="ident">set</span>(<span class="ident">s</span>.<span class="ident">clone</span>()); <span class="ident">de_name</span>.<span class="ident">set</span>(<span class="ident">s</span>); } } <span class="comment">// Parse `#[serde(rename(serialize = "foo", deserialize = "bar"))]`</span> <span class="ident">MetaItem</span>(<span class="ident">List</span>(<span class="kw-2">ref</span> <span class="ident">name</span>, <span class="kw-2">ref</span> <span class="ident">meta_items</span>)) <span class="kw">if</span> <span class="ident">name</span> <span class="op">==</span> <span class="string">"rename"</span> <span class="op">=></span> { <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Ok</span>((<span class="ident">ser</span>, <span class="ident">de</span>)) <span class="op">=</span> <span class="ident">get_renames</span>(<span class="ident">cx</span>, <span class="ident">meta_items</span>) { <span class="ident">ser_name</span>.<span class="ident">set_opt</span>(<span class="ident">ser</span>); <span class="ident">de_name</span>.<span class="ident">set_opt</span>(<span class="ident">de</span>); } } <span class="comment">// Parse `#[serde(rename_all = "foo")]`</span> <span class="ident">MetaItem</span>(<span class="ident">NameValue</span>(<span class="kw-2">ref</span> <span class="ident">name</span>, <span class="kw-2">ref</span> <span class="ident">lit</span>)) <span class="kw">if</span> <span class="ident">name</span> <span class="op">==</span> <span class="string">"rename_all"</span> <span class="op">=></span> { <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Ok</span>(<span class="ident">s</span>) <span class="op">=</span> <span class="ident">get_string_from_lit</span>(<span class="ident">cx</span>, <span class="ident">name</span>.<span class="ident">as_ref</span>(), <span class="ident">name</span>.<span class="ident">as_ref</span>(), <span class="ident">lit</span>) { <span class="kw">match</span> <span class="ident">RenameRule</span>::<span class="ident">from_str</span>(<span class="kw-2">&</span><span class="ident">s</span>) { <span class="prelude-val">Ok</span>(<span class="ident">rename_rule</span>) <span class="op">=></span> <span class="ident">rename_all</span>.<span class="ident">set</span>(<span class="ident">rename_rule</span>), <span class="prelude-val">Err</span>(()) <span class="op">=></span> { <span class="ident">cx</span>.<span class="ident">error</span>(<span class="macro">format</span><span class="macro">!</span>(<span class="string">"unknown rename rule for #[serde(rename_all \ = {:?})]"</span>, <span class="ident">s</span>)) } } } } <span class="comment">// Parse `#[serde(skip_deserializing)]`</span> <span class="ident">MetaItem</span>(<span class="ident">Word</span>(<span class="kw-2">ref</span> <span class="ident">name</span>)) <span class="kw">if</span> <span class="ident">name</span> <span class="op">==</span> <span class="string">"skip_deserializing"</span> <span class="op">=></span> { <span class="ident">skip_deserializing</span>.<span class="ident">set_true</span>(); } <span class="comment">// Parse `#[serde(skip_serializing)]`</span> <span class="ident">MetaItem</span>(<span class="ident">Word</span>(<span class="kw-2">ref</span> <span class="ident">name</span>)) <span class="kw">if</span> <span class="ident">name</span> <span class="op">==</span> <span class="string">"skip_serializing"</span> <span class="op">=></span> { <span class="ident">skip_serializing</span>.<span class="ident">set_true</span>(); } <span class="comment">// Parse `#[serde(other)]`</span> <span class="ident">MetaItem</span>(<span class="ident">Word</span>(<span class="kw-2">ref</span> <span class="ident">name</span>)) <span class="kw">if</span> <span class="ident">name</span> <span class="op">==</span> <span class="string">"other"</span> <span class="op">=></span> { <span class="ident">other</span>.<span class="ident">set_true</span>(); } <span class="ident">MetaItem</span>(<span class="kw-2">ref</span> <span class="ident">meta_item</span>) <span class="op">=></span> { <span class="ident">cx</span>.<span class="ident">error</span>(<span class="macro">format</span><span class="macro">!</span>(<span class="string">"unknown serde variant attribute `{}`"</span>, <span class="ident">meta_item</span>.<span class="ident">name</span>())); } <span class="ident">Literal</span>(_) <span class="op">=></span> { <span class="ident">cx</span>.<span class="ident">error</span>(<span class="string">"unexpected literal in serde variant attribute"</span>); } } } } <span class="kw">let</span> <span class="ident">ser_name</span> <span class="op">=</span> <span class="ident">ser_name</span>.<span class="ident">get</span>(); <span class="kw">let</span> <span class="ident">ser_renamed</span> <span class="op">=</span> <span class="ident">ser_name</span>.<span class="ident">is_some</span>(); <span class="kw">let</span> <span class="ident">de_name</span> <span class="op">=</span> <span class="ident">de_name</span>.<span class="ident">get</span>(); <span class="kw">let</span> <span class="ident">de_renamed</span> <span class="op">=</span> <span class="ident">de_name</span>.<span class="ident">is_some</span>(); <span class="ident">Variant</span> { <span class="ident">name</span>: <span class="ident">Name</span> { <span class="ident">serialize</span>: <span class="ident">ser_name</span>.<span class="ident">unwrap_or_else</span>(<span class="op">||</span> <span class="ident">variant</span>.<span class="ident">ident</span>.<span class="ident">to_string</span>()), <span class="ident">deserialize</span>: <span class="ident">de_name</span>.<span class="ident">unwrap_or_else</span>(<span class="op">||</span> <span class="ident">variant</span>.<span class="ident">ident</span>.<span class="ident">to_string</span>()), }, <span class="ident">ser_renamed</span>: <span class="ident">ser_renamed</span>, <span class="ident">de_renamed</span>: <span class="ident">de_renamed</span>, <span class="ident">rename_all</span>: <span class="ident">rename_all</span>.<span class="ident">get</span>().<span class="ident">unwrap_or</span>(<span class="ident">RenameRule</span>::<span class="prelude-val">None</span>), <span class="ident">skip_deserializing</span>: <span class="ident">skip_deserializing</span>.<span class="ident">get</span>(), <span class="ident">skip_serializing</span>: <span class="ident">skip_serializing</span>.<span class="ident">get</span>(), <span class="ident">other</span>: <span class="ident">other</span>.<span class="ident">get</span>(), } } <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">name</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="ident">Name</span> { <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">name</span> } <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">rename_by_rule</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">rule</span>: <span class="kw-2">&</span><span class="ident">RenameRule</span>) { <span class="kw">if</span> <span class="op">!</span><span class="self">self</span>.<span class="ident">ser_renamed</span> { <span class="self">self</span>.<span class="ident">name</span>.<span class="ident">serialize</span> <span class="op">=</span> <span class="ident">rule</span>.<span class="ident">apply_to_variant</span>(<span class="kw-2">&</span><span class="self">self</span>.<span class="ident">name</span>.<span class="ident">serialize</span>); } <span class="kw">if</span> <span class="op">!</span><span class="self">self</span>.<span class="ident">de_renamed</span> { <span class="self">self</span>.<span class="ident">name</span>.<span class="ident">deserialize</span> <span class="op">=</span> <span class="ident">rule</span>.<span class="ident">apply_to_variant</span>(<span class="kw-2">&</span><span class="self">self</span>.<span class="ident">name</span>.<span class="ident">deserialize</span>); } } <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">rename_all</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="ident">RenameRule</span> { <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">rename_all</span> } <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">skip_deserializing</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">bool</span> { <span class="self">self</span>.<span class="ident">skip_deserializing</span> } <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">skip_serializing</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">bool</span> { <span class="self">self</span>.<span class="ident">skip_serializing</span> } <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">other</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">bool</span> { <span class="self">self</span>.<span class="ident">other</span> } } <span class="doccomment">/// Represents field attribute information</span> <span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>)]</span> <span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Field</span> { <span class="ident">name</span>: <span class="ident">Name</span>, <span class="ident">ser_renamed</span>: <span class="ident">bool</span>, <span class="ident">de_renamed</span>: <span class="ident">bool</span>, <span class="ident">skip_serializing</span>: <span class="ident">bool</span>, <span class="ident">skip_deserializing</span>: <span class="ident">bool</span>, <span class="ident">skip_serializing_if</span>: <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">syn</span>::<span class="ident">Path</span><span class="op">></span>, <span class="ident">default</span>: <span class="ident">Default</span>, <span class="ident">serialize_with</span>: <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">syn</span>::<span class="ident">Path</span><span class="op">></span>, <span class="ident">deserialize_with</span>: <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">syn</span>::<span class="ident">Path</span><span class="op">></span>, <span class="ident">ser_bound</span>: <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">Vec</span><span class="op"><</span><span class="ident">syn</span>::<span class="ident">WherePredicate</span><span class="op">>></span>, <span class="ident">de_bound</span>: <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">Vec</span><span class="op"><</span><span class="ident">syn</span>::<span class="ident">WherePredicate</span><span class="op">>></span>, <span class="ident">borrowed_lifetimes</span>: <span class="ident">BTreeSet</span><span class="op"><</span><span class="ident">syn</span>::<span class="ident">Lifetime</span><span class="op">></span>, <span class="ident">getter</span>: <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">syn</span>::<span class="ident">Path</span><span class="op">></span>, } <span class="doccomment">/// Represents the default to use for a field when deserializing.</span> <span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>, <span class="ident">PartialEq</span>)]</span> <span class="kw">pub</span> <span class="kw">enum</span> <span class="ident">Default</span> { <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> <span class="ident">Default</span>, <span class="doccomment">/// The default is given by this function.</span> <span class="ident">Path</span>(<span class="ident">syn</span>::<span class="ident">Path</span>), } <span class="kw">impl</span> <span class="ident">Field</span> { <span class="doccomment">/// Extract out the `#[serde(...)]` attributes from a struct field.</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">from_ast</span>(<span class="ident">cx</span>: <span class="kw-2">&</span><span class="ident">Ctxt</span>, <span class="ident">index</span>: <span class="ident">usize</span>, <span class="ident">field</span>: <span class="kw-2">&</span><span class="ident">syn</span>::<span class="ident">Field</span>) <span class="op">-></span> <span class="self">Self</span> { <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">ser_name</span> <span class="op">=</span> <span class="ident">Attr</span>::<span class="ident">none</span>(<span class="ident">cx</span>, <span class="string">"rename"</span>); <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">de_name</span> <span class="op">=</span> <span class="ident">Attr</span>::<span class="ident">none</span>(<span class="ident">cx</span>, <span class="string">"rename"</span>); <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">skip_serializing</span> <span class="op">=</span> <span class="ident">BoolAttr</span>::<span class="ident">none</span>(<span class="ident">cx</span>, <span class="string">"skip_serializing"</span>); <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">skip_deserializing</span> <span class="op">=</span> <span class="ident">BoolAttr</span>::<span class="ident">none</span>(<span class="ident">cx</span>, <span class="string">"skip_deserializing"</span>); <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">skip_serializing_if</span> <span class="op">=</span> <span class="ident">Attr</span>::<span class="ident">none</span>(<span class="ident">cx</span>, <span class="string">"skip_serializing_if"</span>); <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">default</span> <span class="op">=</span> <span class="ident">Attr</span>::<span class="ident">none</span>(<span class="ident">cx</span>, <span class="string">"default"</span>); <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">serialize_with</span> <span class="op">=</span> <span class="ident">Attr</span>::<span class="ident">none</span>(<span class="ident">cx</span>, <span class="string">"serialize_with"</span>); <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">deserialize_with</span> <span class="op">=</span> <span class="ident">Attr</span>::<span class="ident">none</span>(<span class="ident">cx</span>, <span class="string">"deserialize_with"</span>); <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">ser_bound</span> <span class="op">=</span> <span class="ident">Attr</span>::<span class="ident">none</span>(<span class="ident">cx</span>, <span class="string">"bound"</span>); <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">de_bound</span> <span class="op">=</span> <span class="ident">Attr</span>::<span class="ident">none</span>(<span class="ident">cx</span>, <span class="string">"bound"</span>); <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">borrowed_lifetimes</span> <span class="op">=</span> <span class="ident">Attr</span>::<span class="ident">none</span>(<span class="ident">cx</span>, <span class="string">"borrow"</span>); <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">getter</span> <span class="op">=</span> <span class="ident">Attr</span>::<span class="ident">none</span>(<span class="ident">cx</span>, <span class="string">"getter"</span>); <span class="kw">let</span> <span class="ident">ident</span> <span class="op">=</span> <span class="kw">match</span> <span class="ident">field</span>.<span class="ident">ident</span> { <span class="prelude-val">Some</span>(<span class="kw-2">ref</span> <span class="ident">ident</span>) <span class="op">=></span> <span class="ident">ident</span>.<span class="ident">to_string</span>(), <span class="prelude-val">None</span> <span class="op">=></span> <span class="ident">index</span>.<span class="ident">to_string</span>(), }; <span class="kw">for</span> <span class="ident">meta_items</span> <span class="kw">in</span> <span class="ident">field</span>.<span class="ident">attrs</span>.<span class="ident">iter</span>().<span class="ident">filter_map</span>(<span class="ident">get_serde_meta_items</span>) { <span class="kw">for</span> <span class="ident">meta_item</span> <span class="kw">in</span> <span class="ident">meta_items</span> { <span class="kw">match</span> <span class="ident">meta_item</span> { <span class="comment">// Parse `#[serde(rename = "foo")]`</span> <span class="ident">MetaItem</span>(<span class="ident">NameValue</span>(<span class="kw-2">ref</span> <span class="ident">name</span>, <span class="kw-2">ref</span> <span class="ident">lit</span>)) <span class="kw">if</span> <span class="ident">name</span> <span class="op">==</span> <span class="string">"rename"</span> <span class="op">=></span> { <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Ok</span>(<span class="ident">s</span>) <span class="op">=</span> <span class="ident">get_string_from_lit</span>(<span class="ident">cx</span>, <span class="ident">name</span>.<span class="ident">as_ref</span>(), <span class="ident">name</span>.<span class="ident">as_ref</span>(), <span class="ident">lit</span>) { <span class="ident">ser_name</span>.<span class="ident">set</span>(<span class="ident">s</span>.<span class="ident">clone</span>()); <span class="ident">de_name</span>.<span class="ident">set</span>(<span class="ident">s</span>); } } <span class="comment">// Parse `#[serde(rename(serialize = "foo", deserialize = "bar"))]`</span> <span class="ident">MetaItem</span>(<span class="ident">List</span>(<span class="kw-2">ref</span> <span class="ident">name</span>, <span class="kw-2">ref</span> <span class="ident">meta_items</span>)) <span class="kw">if</span> <span class="ident">name</span> <span class="op">==</span> <span class="string">"rename"</span> <span class="op">=></span> { <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Ok</span>((<span class="ident">ser</span>, <span class="ident">de</span>)) <span class="op">=</span> <span class="ident">get_renames</span>(<span class="ident">cx</span>, <span class="ident">meta_items</span>) { <span class="ident">ser_name</span>.<span class="ident">set_opt</span>(<span class="ident">ser</span>); <span class="ident">de_name</span>.<span class="ident">set_opt</span>(<span class="ident">de</span>); } } <span class="comment">// Parse `#[serde(default)]`</span> <span class="ident">MetaItem</span>(<span class="ident">Word</span>(<span class="kw-2">ref</span> <span class="ident">name</span>)) <span class="kw">if</span> <span class="ident">name</span> <span class="op">==</span> <span class="string">"default"</span> <span class="op">=></span> { <span class="ident">default</span>.<span class="ident">set</span>(<span class="ident">Default</span>::<span class="ident">Default</span>); } <span class="comment">// Parse `#[serde(default = "...")]`</span> <span class="ident">MetaItem</span>(<span class="ident">NameValue</span>(<span class="kw-2">ref</span> <span class="ident">name</span>, <span class="kw-2">ref</span> <span class="ident">lit</span>)) <span class="kw">if</span> <span class="ident">name</span> <span class="op">==</span> <span class="string">"default"</span> <span class="op">=></span> { <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Ok</span>(<span class="ident">path</span>) <span class="op">=</span> <span class="ident">parse_lit_into_path</span>(<span class="ident">cx</span>, <span class="ident">name</span>.<span class="ident">as_ref</span>(), <span class="ident">lit</span>) { <span class="ident">default</span>.<span class="ident">set</span>(<span class="ident">Default</span>::<span class="ident">Path</span>(<span class="ident">path</span>)); } } <span class="comment">// Parse `#[serde(skip_serializing)]`</span> <span class="ident">MetaItem</span>(<span class="ident">Word</span>(<span class="kw-2">ref</span> <span class="ident">name</span>)) <span class="kw">if</span> <span class="ident">name</span> <span class="op">==</span> <span class="string">"skip_serializing"</span> <span class="op">=></span> { <span class="ident">skip_serializing</span>.<span class="ident">set_true</span>(); } <span class="comment">// Parse `#[serde(skip_deserializing)]`</span> <span class="ident">MetaItem</span>(<span class="ident">Word</span>(<span class="kw-2">ref</span> <span class="ident">name</span>)) <span class="kw">if</span> <span class="ident">name</span> <span class="op">==</span> <span class="string">"skip_deserializing"</span> <span class="op">=></span> { <span class="ident">skip_deserializing</span>.<span class="ident">set_true</span>(); } <span class="comment">// Parse `#[serde(skip)]`</span> <span class="ident">MetaItem</span>(<span class="ident">Word</span>(<span class="kw-2">ref</span> <span class="ident">name</span>)) <span class="kw">if</span> <span class="ident">name</span> <span class="op">==</span> <span class="string">"skip"</span> <span class="op">=></span> { <span class="ident">skip_serializing</span>.<span class="ident">set_true</span>(); <span class="ident">skip_deserializing</span>.<span class="ident">set_true</span>(); }, <span class="comment">// Parse `#[serde(skip_serializing_if = "...")]`</span> <span class="ident">MetaItem</span>(<span class="ident">NameValue</span>(<span class="kw-2">ref</span> <span class="ident">name</span>, <span class="kw-2">ref</span> <span class="ident">lit</span>)) <span class="kw">if</span> <span class="ident">name</span> <span class="op">==</span> <span class="string">"skip_serializing_if"</span> <span class="op">=></span> { <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Ok</span>(<span class="ident">path</span>) <span class="op">=</span> <span class="ident">parse_lit_into_path</span>(<span class="ident">cx</span>, <span class="ident">name</span>.<span class="ident">as_ref</span>(), <span class="ident">lit</span>) { <span class="ident">skip_serializing_if</span>.<span class="ident">set</span>(<span class="ident">path</span>); } } <span class="comment">// Parse `#[serde(serialize_with = "...")]`</span> <span class="ident">MetaItem</span>(<span class="ident">NameValue</span>(<span class="kw-2">ref</span> <span class="ident">name</span>, <span class="kw-2">ref</span> <span class="ident">lit</span>)) <span class="kw">if</span> <span class="ident">name</span> <span class="op">==</span> <span class="string">"serialize_with"</span> <span class="op">=></span> { <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Ok</span>(<span class="ident">path</span>) <span class="op">=</span> <span class="ident">parse_lit_into_path</span>(<span class="ident">cx</span>, <span class="ident">name</span>.<span class="ident">as_ref</span>(), <span class="ident">lit</span>) { <span class="ident">serialize_with</span>.<span class="ident">set</span>(<span class="ident">path</span>); } } <span class="comment">// Parse `#[serde(deserialize_with = "...")]`</span> <span class="ident">MetaItem</span>(<span class="ident">NameValue</span>(<span class="kw-2">ref</span> <span class="ident">name</span>, <span class="kw-2">ref</span> <span class="ident">lit</span>)) <span class="kw">if</span> <span class="ident">name</span> <span class="op">==</span> <span class="string">"deserialize_with"</span> <span class="op">=></span> { <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Ok</span>(<span class="ident">path</span>) <span class="op">=</span> <span class="ident">parse_lit_into_path</span>(<span class="ident">cx</span>, <span class="ident">name</span>.<span class="ident">as_ref</span>(), <span class="ident">lit</span>) { <span class="ident">deserialize_with</span>.<span class="ident">set</span>(<span class="ident">path</span>); } } <span class="comment">// Parse `#[serde(with = "...")]`</span> <span class="ident">MetaItem</span>(<span class="ident">NameValue</span>(<span class="kw-2">ref</span> <span class="ident">name</span>, <span class="kw-2">ref</span> <span class="ident">lit</span>)) <span class="kw">if</span> <span class="ident">name</span> <span class="op">==</span> <span class="string">"with"</span> <span class="op">=></span> { <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Ok</span>(<span class="ident">path</span>) <span class="op">=</span> <span class="ident">parse_lit_into_path</span>(<span class="ident">cx</span>, <span class="ident">name</span>.<span class="ident">as_ref</span>(), <span class="ident">lit</span>) { <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">ser_path</span> <span class="op">=</span> <span class="ident">path</span>.<span class="ident">clone</span>(); <span class="ident">ser_path</span>.<span class="ident">segments</span>.<span class="ident">push</span>(<span class="string">"serialize"</span>.<span class="ident">into</span>()); <span class="ident">serialize_with</span>.<span class="ident">set</span>(<span class="ident">ser_path</span>); <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">de_path</span> <span class="op">=</span> <span class="ident">path</span>; <span class="ident">de_path</span>.<span class="ident">segments</span>.<span class="ident">push</span>(<span class="string">"deserialize"</span>.<span class="ident">into</span>()); <span class="ident">deserialize_with</span>.<span class="ident">set</span>(<span class="ident">de_path</span>); } } <span class="comment">// Parse `#[serde(bound = "D: Serialize")]`</span> <span class="ident">MetaItem</span>(<span class="ident">NameValue</span>(<span class="kw-2">ref</span> <span class="ident">name</span>, <span class="kw-2">ref</span> <span class="ident">lit</span>)) <span class="kw">if</span> <span class="ident">name</span> <span class="op">==</span> <span class="string">"bound"</span> <span class="op">=></span> { <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Ok</span>(<span class="ident">where_predicates</span>) <span class="op">=</span> <span class="ident">parse_lit_into_where</span>(<span class="ident">cx</span>, <span class="ident">name</span>.<span class="ident">as_ref</span>(), <span class="ident">name</span>.<span class="ident">as_ref</span>(), <span class="ident">lit</span>) { <span class="ident">ser_bound</span>.<span class="ident">set</span>(<span class="ident">where_predicates</span>.<span class="ident">clone</span>()); <span class="ident">de_bound</span>.<span class="ident">set</span>(<span class="ident">where_predicates</span>); } } <span class="comment">// Parse `#[serde(bound(serialize = "D: Serialize", deserialize = "D: Deserialize"))]`</span> <span class="ident">MetaItem</span>(<span class="ident">List</span>(<span class="kw-2">ref</span> <span class="ident">name</span>, <span class="kw-2">ref</span> <span class="ident">meta_items</span>)) <span class="kw">if</span> <span class="ident">name</span> <span class="op">==</span> <span class="string">"bound"</span> <span class="op">=></span> { <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Ok</span>((<span class="ident">ser</span>, <span class="ident">de</span>)) <span class="op">=</span> <span class="ident">get_where_predicates</span>(<span class="ident">cx</span>, <span class="ident">meta_items</span>) { <span class="ident">ser_bound</span>.<span class="ident">set_opt</span>(<span class="ident">ser</span>); <span class="ident">de_bound</span>.<span class="ident">set_opt</span>(<span class="ident">de</span>); } } <span class="comment">// Parse `#[serde(borrow)]`</span> <span class="ident">MetaItem</span>(<span class="ident">Word</span>(<span class="kw-2">ref</span> <span class="ident">name</span>)) <span class="kw">if</span> <span class="ident">name</span> <span class="op">==</span> <span class="string">"borrow"</span> <span class="op">=></span> { <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Ok</span>(<span class="ident">borrowable</span>) <span class="op">=</span> <span class="ident">borrowable_lifetimes</span>(<span class="ident">cx</span>, <span class="kw-2">&</span><span class="ident">ident</span>, <span class="kw-2">&</span><span class="ident">field</span>.<span class="ident">ty</span>) { <span class="ident">borrowed_lifetimes</span>.<span class="ident">set</span>(<span class="ident">borrowable</span>); } } <span class="comment">// Parse `#[serde(borrow = "'a + 'b")]`</span> <span class="ident">MetaItem</span>(<span class="ident">NameValue</span>(<span class="kw-2">ref</span> <span class="ident">name</span>, <span class="kw-2">ref</span> <span class="ident">lit</span>)) <span class="kw">if</span> <span class="ident">name</span> <span class="op">==</span> <span class="string">"borrow"</span> <span class="op">=></span> { <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Ok</span>(<span class="ident">lifetimes</span>) <span class="op">=</span> <span class="ident">parse_lit_into_lifetimes</span>(<span class="ident">cx</span>, <span class="ident">name</span>.<span class="ident">as_ref</span>(), <span class="ident">lit</span>) { <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Ok</span>(<span class="ident">borrowable</span>) <span class="op">=</span> <span class="ident">borrowable_lifetimes</span>(<span class="ident">cx</span>, <span class="kw-2">&</span><span class="ident">ident</span>, <span class="kw-2">&</span><span class="ident">field</span>.<span class="ident">ty</span>) { <span class="kw">for</span> <span class="ident">lifetime</span> <span class="kw">in</span> <span class="kw-2">&</span><span class="ident">lifetimes</span> { <span class="kw">if</span> <span class="op">!</span><span class="ident">borrowable</span>.<span class="ident">contains</span>(<span class="ident">lifetime</span>) { <span class="ident">cx</span>.<span class="ident">error</span>( <span class="macro">format</span><span class="macro">!</span>( <span class="string">"field `{}` does not have lifetime {}"</span>, <span class="ident">ident</span>, <span class="ident">lifetime</span>.<span class="ident">ident</span> ), ); } } <span class="ident">borrowed_lifetimes</span>.<span class="ident">set</span>(<span class="ident">lifetimes</span>); } } } <span class="comment">// Parse `#[serde(getter = "...")]`</span> <span class="ident">MetaItem</span>(<span class="ident">NameValue</span>(<span class="kw-2">ref</span> <span class="ident">name</span>, <span class="kw-2">ref</span> <span class="ident">lit</span>)) <span class="kw">if</span> <span class="ident">name</span> <span class="op">==</span> <span class="string">"getter"</span> <span class="op">=></span> { <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Ok</span>(<span class="ident">path</span>) <span class="op">=</span> <span class="ident">parse_lit_into_path</span>(<span class="ident">cx</span>, <span class="ident">name</span>.<span class="ident">as_ref</span>(), <span class="ident">lit</span>) { <span class="ident">getter</span>.<span class="ident">set</span>(<span class="ident">path</span>); } } <span class="ident">MetaItem</span>(<span class="kw-2">ref</span> <span class="ident">meta_item</span>) <span class="op">=></span> { <span class="ident">cx</span>.<span class="ident">error</span>(<span class="macro">format</span><span class="macro">!</span>(<span class="string">"unknown serde field attribute `{}`"</span>, <span class="ident">meta_item</span>.<span class="ident">name</span>()),); } <span class="ident">Literal</span>(_) <span class="op">=></span> { <span class="ident">cx</span>.<span class="ident">error</span>(<span class="string">"unexpected literal in serde field attribute"</span>); } } } } <span class="comment">// Is skip_deserializing, initialize the field to Default::default()</span> <span class="comment">// unless a different default is specified by `#[serde(default = "...")]`</span> <span class="kw">if</span> <span class="ident">skip_deserializing</span>.<span class="number">0</span>.<span class="ident">value</span>.<span class="ident">is_some</span>() { <span class="ident">default</span>.<span class="ident">set_if_none</span>(<span class="ident">Default</span>::<span class="ident">Default</span>); } <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">borrowed_lifetimes</span> <span class="op">=</span> <span class="ident">borrowed_lifetimes</span>.<span class="ident">get</span>().<span class="ident">unwrap_or_default</span>(); <span class="kw">if</span> <span class="op">!</span><span class="ident">borrowed_lifetimes</span>.<span class="ident">is_empty</span>() { <span class="comment">// Cow<str> and Cow<[u8]> never borrow by default:</span> <span class="comment">//</span> <span class="comment">// impl<'de, 'a, T: ?Sized> Deserialize<'de> for Cow<'a, T></span> <span class="comment">//</span> <span class="comment">// A #[serde(borrow)] attribute enables borrowing that corresponds</span> <span class="comment">// roughly to these impls:</span> <span class="comment">//</span> <span class="comment">// impl<'de: 'a, 'a> Deserialize<'de> for Cow<'a, str></span> <span class="comment">// impl<'de: 'a, 'a> Deserialize<'de> for Cow<'a, [u8]></span> <span class="kw">if</span> <span class="ident">is_cow</span>(<span class="kw-2">&</span><span class="ident">field</span>.<span class="ident">ty</span>, <span class="string">"str"</span>) { <span class="kw">let</span> <span class="ident">path</span> <span class="op">=</span> <span class="ident">syn</span>::<span class="ident">parse_path</span>(<span class="string">"_serde::private::de::borrow_cow_str"</span>).<span class="ident">unwrap</span>(); <span class="ident">deserialize_with</span>.<span class="ident">set_if_none</span>(<span class="ident">path</span>); } <span class="kw">else</span> <span class="kw">if</span> <span class="ident">is_cow</span>(<span class="kw-2">&</span><span class="ident">field</span>.<span class="ident">ty</span>, <span class="string">"[u8]"</span>) { <span class="kw">let</span> <span class="ident">path</span> <span class="op">=</span> <span class="ident">syn</span>::<span class="ident">parse_path</span>(<span class="string">"_serde::private::de::borrow_cow_bytes"</span>).<span class="ident">unwrap</span>(); <span class="ident">deserialize_with</span>.<span class="ident">set_if_none</span>(<span class="ident">path</span>); } } <span class="kw">else</span> <span class="kw">if</span> <span class="ident">is_rptr</span>(<span class="kw-2">&</span><span class="ident">field</span>.<span class="ident">ty</span>, <span class="string">"str"</span>) <span class="op">||</span> <span class="ident">is_rptr</span>(<span class="kw-2">&</span><span class="ident">field</span>.<span class="ident">ty</span>, <span class="string">"[u8]"</span>) { <span class="comment">// Types &str and &[u8] are always implicitly borrowed. No need for</span> <span class="comment">// a #[serde(borrow)].</span> <span class="ident">borrowed_lifetimes</span> <span class="op">=</span> <span class="ident">borrowable_lifetimes</span>(<span class="ident">cx</span>, <span class="kw-2">&</span><span class="ident">ident</span>, <span class="kw-2">&</span><span class="ident">field</span>.<span class="ident">ty</span>).<span class="ident">unwrap</span>(); } <span class="kw">let</span> <span class="ident">ser_name</span> <span class="op">=</span> <span class="ident">ser_name</span>.<span class="ident">get</span>(); <span class="kw">let</span> <span class="ident">ser_renamed</span> <span class="op">=</span> <span class="ident">ser_name</span>.<span class="ident">is_some</span>(); <span class="kw">let</span> <span class="ident">de_name</span> <span class="op">=</span> <span class="ident">de_name</span>.<span class="ident">get</span>(); <span class="kw">let</span> <span class="ident">de_renamed</span> <span class="op">=</span> <span class="ident">de_name</span>.<span class="ident">is_some</span>(); <span class="ident">Field</span> { <span class="ident">name</span>: <span class="ident">Name</span> { <span class="ident">serialize</span>: <span class="ident">ser_name</span>.<span class="ident">unwrap_or_else</span>(<span class="op">||</span> <span class="ident">ident</span>.<span class="ident">clone</span>()), <span class="ident">deserialize</span>: <span class="ident">de_name</span>.<span class="ident">unwrap_or</span>(<span class="ident">ident</span>), }, <span class="ident">ser_renamed</span>: <span class="ident">ser_renamed</span>, <span class="ident">de_renamed</span>: <span class="ident">de_renamed</span>, <span class="ident">skip_serializing</span>: <span class="ident">skip_serializing</span>.<span class="ident">get</span>(), <span class="ident">skip_deserializing</span>: <span class="ident">skip_deserializing</span>.<span class="ident">get</span>(), <span class="ident">skip_serializing_if</span>: <span class="ident">skip_serializing_if</span>.<span class="ident">get</span>(), <span class="ident">default</span>: <span class="ident">default</span>.<span class="ident">get</span>().<span class="ident">unwrap_or</span>(<span class="ident">Default</span>::<span class="prelude-val">None</span>), <span class="ident">serialize_with</span>: <span class="ident">serialize_with</span>.<span class="ident">get</span>(), <span class="ident">deserialize_with</span>: <span class="ident">deserialize_with</span>.<span class="ident">get</span>(), <span class="ident">ser_bound</span>: <span class="ident">ser_bound</span>.<span class="ident">get</span>(), <span class="ident">de_bound</span>: <span class="ident">de_bound</span>.<span class="ident">get</span>(), <span class="ident">borrowed_lifetimes</span>: <span class="ident">borrowed_lifetimes</span>, <span class="ident">getter</span>: <span class="ident">getter</span>.<span class="ident">get</span>(), } } <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">name</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="ident">Name</span> { <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">name</span> } <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">rename_by_rule</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">rule</span>: <span class="kw-2">&</span><span class="ident">RenameRule</span>) { <span class="kw">if</span> <span class="op">!</span><span class="self">self</span>.<span class="ident">ser_renamed</span> { <span class="self">self</span>.<span class="ident">name</span>.<span class="ident">serialize</span> <span class="op">=</span> <span class="ident">rule</span>.<span class="ident">apply_to_field</span>(<span class="kw-2">&</span><span class="self">self</span>.<span class="ident">name</span>.<span class="ident">serialize</span>); } <span class="kw">if</span> <span class="op">!</span><span class="self">self</span>.<span class="ident">de_renamed</span> { <span class="self">self</span>.<span class="ident">name</span>.<span class="ident">deserialize</span> <span class="op">=</span> <span class="ident">rule</span>.<span class="ident">apply_to_field</span>(<span class="kw-2">&</span><span class="self">self</span>.<span class="ident">name</span>.<span class="ident">deserialize</span>); } } <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">skip_serializing</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">bool</span> { <span class="self">self</span>.<span class="ident">skip_serializing</span> } <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">skip_deserializing</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">bool</span> { <span class="self">self</span>.<span class="ident">skip_deserializing</span> } <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">skip_serializing_if</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="ident">syn</span>::<span class="ident">Path</span><span class="op">></span> { <span class="self">self</span>.<span class="ident">skip_serializing_if</span>.<span class="ident">as_ref</span>() } <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">default</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="ident">Default</span> { <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">default</span> } <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">serialize_with</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="ident">syn</span>::<span class="ident">Path</span><span class="op">></span> { <span class="self">self</span>.<span class="ident">serialize_with</span>.<span class="ident">as_ref</span>() } <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">deserialize_with</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="ident">syn</span>::<span class="ident">Path</span><span class="op">></span> { <span class="self">self</span>.<span class="ident">deserialize_with</span>.<span class="ident">as_ref</span>() } <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">ser_bound</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span>[<span class="ident">syn</span>::<span class="ident">WherePredicate</span>]<span class="op">></span> { <span class="self">self</span>.<span class="ident">ser_bound</span>.<span class="ident">as_ref</span>().<span class="ident">map</span>(<span class="op">|</span><span class="ident">vec</span><span class="op">|</span> <span class="kw-2">&</span><span class="ident">vec</span>[..]) } <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">de_bound</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span>[<span class="ident">syn</span>::<span class="ident">WherePredicate</span>]<span class="op">></span> { <span class="self">self</span>.<span class="ident">de_bound</span>.<span class="ident">as_ref</span>().<span class="ident">map</span>(<span class="op">|</span><span class="ident">vec</span><span class="op">|</span> <span class="kw-2">&</span><span class="ident">vec</span>[..]) } <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">borrowed_lifetimes</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="ident">BTreeSet</span><span class="op"><</span><span class="ident">syn</span>::<span class="ident">Lifetime</span><span class="op">></span> { <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">borrowed_lifetimes</span> } <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">getter</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="ident">syn</span>::<span class="ident">Path</span><span class="op">></span> { <span class="self">self</span>.<span class="ident">getter</span>.<span class="ident">as_ref</span>() } } <span class="kw">type</span> <span class="ident">SerAndDe</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="op">=</span> (<span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>, <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>); <span class="kw">fn</span> <span class="ident">get_ser_and_de</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">F</span><span class="op">></span>( <span class="ident">cx</span>: <span class="kw-2">&</span><span class="ident">Ctxt</span>, <span class="ident">attr_name</span>: <span class="kw-2">&</span><span class="lifetime">'static</span> <span class="ident">str</span>, <span class="ident">items</span>: <span class="kw-2">&</span>[<span class="ident">syn</span>::<span class="ident">NestedMetaItem</span>], <span class="ident">f</span>: <span class="ident">F</span>, ) <span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">SerAndDe</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>, ()<span class="op">></span> <span class="kw">where</span> <span class="ident">F</span>: <span class="ident">Fn</span>(<span class="kw-2">&</span><span class="ident">Ctxt</span>, <span class="kw-2">&</span><span class="ident">str</span>, <span class="kw-2">&</span><span class="ident">str</span>, <span class="kw-2">&</span><span class="ident">syn</span>::<span class="ident">Lit</span>) <span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">T</span>, ()<span class="op">></span>, { <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">ser_item</span> <span class="op">=</span> <span class="ident">Attr</span>::<span class="ident">none</span>(<span class="ident">cx</span>, <span class="ident">attr_name</span>); <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">de_item</span> <span class="op">=</span> <span class="ident">Attr</span>::<span class="ident">none</span>(<span class="ident">cx</span>, <span class="ident">attr_name</span>); <span class="kw">for</span> <span class="ident">item</span> <span class="kw">in</span> <span class="ident">items</span> { <span class="kw">match</span> <span class="kw-2">*</span><span class="ident">item</span> { <span class="ident">MetaItem</span>(<span class="ident">NameValue</span>(<span class="kw-2">ref</span> <span class="ident">name</span>, <span class="kw-2">ref</span> <span class="ident">lit</span>)) <span class="kw">if</span> <span class="ident">name</span> <span class="op">==</span> <span class="string">"serialize"</span> <span class="op">=></span> { <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Ok</span>(<span class="ident">v</span>) <span class="op">=</span> <span class="ident">f</span>(<span class="ident">cx</span>, <span class="ident">attr_name</span>, <span class="ident">name</span>.<span class="ident">as_ref</span>(), <span class="ident">lit</span>) { <span class="ident">ser_item</span>.<span class="ident">set</span>(<span class="ident">v</span>); } } <span class="ident">MetaItem</span>(<span class="ident">NameValue</span>(<span class="kw-2">ref</span> <span class="ident">name</span>, <span class="kw-2">ref</span> <span class="ident">lit</span>)) <span class="kw">if</span> <span class="ident">name</span> <span class="op">==</span> <span class="string">"deserialize"</span> <span class="op">=></span> { <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Ok</span>(<span class="ident">v</span>) <span class="op">=</span> <span class="ident">f</span>(<span class="ident">cx</span>, <span class="ident">attr_name</span>, <span class="ident">name</span>.<span class="ident">as_ref</span>(), <span class="ident">lit</span>) { <span class="ident">de_item</span>.<span class="ident">set</span>(<span class="ident">v</span>); } } _ <span class="op">=></span> { <span class="ident">cx</span>.<span class="ident">error</span>( <span class="macro">format</span><span class="macro">!</span>( <span class="string">"malformed {0} attribute, expected `{0}(serialize = ..., \ deserialize = ...)`"</span>, <span class="ident">attr_name</span> ), ); <span class="kw">return</span> <span class="prelude-val">Err</span>(()); } } } <span class="prelude-val">Ok</span>((<span class="ident">ser_item</span>.<span class="ident">get</span>(), <span class="ident">de_item</span>.<span class="ident">get</span>())) } <span class="kw">fn</span> <span class="ident">get_renames</span>(<span class="ident">cx</span>: <span class="kw-2">&</span><span class="ident">Ctxt</span>, <span class="ident">items</span>: <span class="kw-2">&</span>[<span class="ident">syn</span>::<span class="ident">NestedMetaItem</span>]) <span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">SerAndDe</span><span class="op"><</span><span class="ident">String</span><span class="op">></span>, ()<span class="op">></span> { <span class="ident">get_ser_and_de</span>(<span class="ident">cx</span>, <span class="string">"rename"</span>, <span class="ident">items</span>, <span class="ident">get_string_from_lit</span>) } <span class="kw">fn</span> <span class="ident">get_where_predicates</span>( <span class="ident">cx</span>: <span class="kw-2">&</span><span class="ident">Ctxt</span>, <span class="ident">items</span>: <span class="kw-2">&</span>[<span class="ident">syn</span>::<span class="ident">NestedMetaItem</span>], ) <span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">SerAndDe</span><span class="op"><</span><span class="ident">Vec</span><span class="op"><</span><span class="ident">syn</span>::<span class="ident">WherePredicate</span><span class="op">>></span>, ()<span class="op">></span> { <span class="ident">get_ser_and_de</span>(<span class="ident">cx</span>, <span class="string">"bound"</span>, <span class="ident">items</span>, <span class="ident">parse_lit_into_where</span>) } <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">get_serde_meta_items</span>(<span class="ident">attr</span>: <span class="kw-2">&</span><span class="ident">syn</span>::<span class="ident">Attribute</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">Vec</span><span class="op"><</span><span class="ident">syn</span>::<span class="ident">NestedMetaItem</span><span class="op">>></span> { <span class="kw">match</span> <span class="ident">attr</span>.<span class="ident">value</span> { <span class="ident">List</span>(<span class="kw-2">ref</span> <span class="ident">name</span>, <span class="kw-2">ref</span> <span class="ident">items</span>) <span class="kw">if</span> <span class="ident">name</span> <span class="op">==</span> <span class="string">"serde"</span> <span class="op">=></span> <span class="prelude-val">Some</span>(<span class="ident">items</span>.<span class="ident">iter</span>().<span class="ident">cloned</span>().<span class="ident">collect</span>()), _ <span class="op">=></span> <span class="prelude-val">None</span>, } } <span class="kw">fn</span> <span class="ident">get_string_from_lit</span>( <span class="ident">cx</span>: <span class="kw-2">&</span><span class="ident">Ctxt</span>, <span class="ident">attr_name</span>: <span class="kw-2">&</span><span class="ident">str</span>, <span class="ident">meta_item_name</span>: <span class="kw-2">&</span><span class="ident">str</span>, <span class="ident">lit</span>: <span class="kw-2">&</span><span class="ident">syn</span>::<span class="ident">Lit</span>, ) <span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">String</span>, ()<span class="op">></span> { <span class="kw">if</span> <span class="kw">let</span> <span class="ident">syn</span>::<span class="ident">Lit</span>::<span class="ident">Str</span>(<span class="kw-2">ref</span> <span class="ident">s</span>, _) <span class="op">=</span> <span class="kw-2">*</span><span class="ident">lit</span> { <span class="prelude-val">Ok</span>(<span class="ident">s</span>.<span class="ident">clone</span>()) } <span class="kw">else</span> { <span class="ident">cx</span>.<span class="ident">error</span>( <span class="macro">format</span><span class="macro">!</span>( <span class="string">"expected serde {} attribute to be a string: `{} = \"...\"`"</span>, <span class="ident">attr_name</span>, <span class="ident">meta_item_name</span> ), ); <span class="prelude-val">Err</span>(()) } } <span class="kw">fn</span> <span class="ident">parse_lit_into_path</span>(<span class="ident">cx</span>: <span class="kw-2">&</span><span class="ident">Ctxt</span>, <span class="ident">attr_name</span>: <span class="kw-2">&</span><span class="ident">str</span>, <span class="ident">lit</span>: <span class="kw-2">&</span><span class="ident">syn</span>::<span class="ident">Lit</span>) <span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">syn</span>::<span class="ident">Path</span>, ()<span class="op">></span> { <span class="kw">let</span> <span class="ident">string</span> <span class="op">=</span> <span class="macro">try</span><span class="macro">!</span>(<span class="ident">get_string_from_lit</span>(<span class="ident">cx</span>, <span class="ident">attr_name</span>, <span class="ident">attr_name</span>, <span class="ident">lit</span>)); <span class="ident">syn</span>::<span class="ident">parse_path</span>(<span class="kw-2">&</span><span class="ident">string</span>).<span class="ident">map_err</span>(<span class="op">|</span><span class="ident">err</span><span class="op">|</span> <span class="ident">cx</span>.<span class="ident">error</span>(<span class="ident">err</span>)) } <span class="kw">fn</span> <span class="ident">parse_lit_into_where</span>( <span class="ident">cx</span>: <span class="kw-2">&</span><span class="ident">Ctxt</span>, <span class="ident">attr_name</span>: <span class="kw-2">&</span><span class="ident">str</span>, <span class="ident">meta_item_name</span>: <span class="kw-2">&</span><span class="ident">str</span>, <span class="ident">lit</span>: <span class="kw-2">&</span><span class="ident">syn</span>::<span class="ident">Lit</span>, ) <span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">Vec</span><span class="op"><</span><span class="ident">syn</span>::<span class="ident">WherePredicate</span><span class="op">></span>, ()<span class="op">></span> { <span class="kw">let</span> <span class="ident">string</span> <span class="op">=</span> <span class="macro">try</span><span class="macro">!</span>(<span class="ident">get_string_from_lit</span>(<span class="ident">cx</span>, <span class="ident">attr_name</span>, <span class="ident">meta_item_name</span>, <span class="ident">lit</span>)); <span class="kw">if</span> <span class="ident">string</span>.<span class="ident">is_empty</span>() { <span class="kw">return</span> <span class="prelude-val">Ok</span>(<span class="ident">Vec</span>::<span class="ident">new</span>()); } <span class="kw">let</span> <span class="ident">where_string</span> <span class="op">=</span> <span class="macro">format</span><span class="macro">!</span>(<span class="string">"where {}"</span>, <span class="ident">string</span>); <span class="ident">syn</span>::<span class="ident">parse_where_clause</span>(<span class="kw-2">&</span><span class="ident">where_string</span>) .<span class="ident">map</span>(<span class="op">|</span><span class="ident">wh</span><span class="op">|</span> <span class="ident">wh</span>.<span class="ident">predicates</span>) .<span class="ident">map_err</span>(<span class="op">|</span><span class="ident">err</span><span class="op">|</span> <span class="ident">cx</span>.<span class="ident">error</span>(<span class="ident">err</span>)) } <span class="kw">fn</span> <span class="ident">parse_lit_into_ty</span>(<span class="ident">cx</span>: <span class="kw-2">&</span><span class="ident">Ctxt</span>, <span class="ident">attr_name</span>: <span class="kw-2">&</span><span class="ident">str</span>, <span class="ident">lit</span>: <span class="kw-2">&</span><span class="ident">syn</span>::<span class="ident">Lit</span>) <span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">syn</span>::<span class="ident">Ty</span>, ()<span class="op">></span> { <span class="kw">let</span> <span class="ident">string</span> <span class="op">=</span> <span class="macro">try</span><span class="macro">!</span>(<span class="ident">get_string_from_lit</span>(<span class="ident">cx</span>, <span class="ident">attr_name</span>, <span class="ident">attr_name</span>, <span class="ident">lit</span>)); <span class="ident">syn</span>::<span class="ident">parse_type</span>(<span class="kw-2">&</span><span class="ident">string</span>).<span class="ident">map_err</span>( <span class="op">|</span>_<span class="op">|</span> { <span class="ident">cx</span>.<span class="ident">error</span>(<span class="macro">format</span><span class="macro">!</span>(<span class="string">"failed to parse type: {} = {:?}"</span>, <span class="ident">attr_name</span>, <span class="ident">string</span>),) }, ) } <span class="comment">// Parses a string literal like "'a + 'b + 'c" containing a nonempty list of</span> <span class="comment">// lifetimes separated by `+`.</span> <span class="kw">fn</span> <span class="ident">parse_lit_into_lifetimes</span>( <span class="ident">cx</span>: <span class="kw-2">&</span><span class="ident">Ctxt</span>, <span class="ident">attr_name</span>: <span class="kw-2">&</span><span class="ident">str</span>, <span class="ident">lit</span>: <span class="kw-2">&</span><span class="ident">syn</span>::<span class="ident">Lit</span>, ) <span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">BTreeSet</span><span class="op"><</span><span class="ident">syn</span>::<span class="ident">Lifetime</span><span class="op">></span>, ()<span class="op">></span> { <span class="kw">let</span> <span class="ident">string</span> <span class="op">=</span> <span class="macro">try</span><span class="macro">!</span>(<span class="ident">get_string_from_lit</span>(<span class="ident">cx</span>, <span class="ident">attr_name</span>, <span class="ident">attr_name</span>, <span class="ident">lit</span>)); <span class="kw">if</span> <span class="ident">string</span>.<span class="ident">is_empty</span>() { <span class="ident">cx</span>.<span class="ident">error</span>(<span class="string">"at least one lifetime must be borrowed"</span>); <span class="kw">return</span> <span class="prelude-val">Err</span>(()); } <span class="macro">named</span><span class="macro">!</span>(<span class="ident">lifetimes</span> <span class="op">-></span> <span class="ident">Vec</span><span class="op"><</span><span class="ident">syn</span>::<span class="ident">Lifetime</span><span class="op">></span>, <span class="macro">separated_nonempty_list</span><span class="macro">!</span>(<span class="macro">punct</span><span class="macro">!</span>(<span class="string">"+"</span>), <span class="ident">syn</span>::<span class="ident">parse</span>::<span class="ident">lifetime</span>) ); <span class="kw">if</span> <span class="kw">let</span> <span class="ident">IResult</span>::<span class="ident">Done</span>(<span class="ident">rest</span>, <span class="ident">o</span>) <span class="op">=</span> <span class="ident">lifetimes</span>(<span class="kw-2">&</span><span class="ident">string</span>) { <span class="kw">if</span> <span class="ident">rest</span>.<span class="ident">trim</span>().<span class="ident">is_empty</span>() { <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">set</span> <span class="op">=</span> <span class="ident">BTreeSet</span>::<span class="ident">new</span>(); <span class="kw">for</span> <span class="ident">lifetime</span> <span class="kw">in</span> <span class="ident">o</span> { <span class="kw">if</span> <span class="op">!</span><span class="ident">set</span>.<span class="ident">insert</span>(<span class="ident">lifetime</span>.<span class="ident">clone</span>()) { <span class="ident">cx</span>.<span class="ident">error</span>(<span class="macro">format</span><span class="macro">!</span>(<span class="string">"duplicate borrowed lifetime `{}`"</span>, <span class="ident">lifetime</span>.<span class="ident">ident</span>)); } } <span class="kw">return</span> <span class="prelude-val">Ok</span>(<span class="ident">set</span>); } } <span class="prelude-val">Err</span>(<span class="ident">cx</span>.<span class="ident">error</span>(<span class="macro">format</span><span class="macro">!</span>(<span class="string">"failed to parse borrowed lifetimes: {:?}"</span>, <span class="ident">string</span>)),) } <span class="comment">// Whether the type looks like it might be `std::borrow::Cow<T>` where elem="T".</span> <span class="comment">// This can have false negatives and false positives.</span> <span class="comment">//</span> <span class="comment">// False negative:</span> <span class="comment">//</span> <span class="comment">// use std::borrow::Cow as Pig;</span> <span class="comment">//</span> <span class="comment">// #[derive(Deserialize)]</span> <span class="comment">// struct S<'a> {</span> <span class="comment">// #[serde(borrow)]</span> <span class="comment">// pig: Pig<'a, str>,</span> <span class="comment">// }</span> <span class="comment">//</span> <span class="comment">// False positive:</span> <span class="comment">//</span> <span class="comment">// type str = [i16];</span> <span class="comment">//</span> <span class="comment">// #[derive(Deserialize)]</span> <span class="comment">// struct S<'a> {</span> <span class="comment">// #[serde(borrow)]</span> <span class="comment">// cow: Cow<'a, str>,</span> <span class="comment">// }</span> <span class="kw">fn</span> <span class="ident">is_cow</span>(<span class="ident">ty</span>: <span class="kw-2">&</span><span class="ident">syn</span>::<span class="ident">Ty</span>, <span class="ident">elem</span>: <span class="kw-2">&</span><span class="ident">str</span>) <span class="op">-></span> <span class="ident">bool</span> { <span class="kw">let</span> <span class="ident">path</span> <span class="op">=</span> <span class="kw">match</span> <span class="kw-2">*</span><span class="ident">ty</span> { <span class="ident">syn</span>::<span class="ident">Ty</span>::<span class="ident">Path</span>(<span class="prelude-val">None</span>, <span class="kw-2">ref</span> <span class="ident">path</span>) <span class="op">=></span> <span class="ident">path</span>, _ <span class="op">=></span> { <span class="kw">return</span> <span class="bool-val">false</span>; } }; <span class="kw">let</span> <span class="ident">seg</span> <span class="op">=</span> <span class="kw">match</span> <span class="ident">path</span>.<span class="ident">segments</span>.<span class="ident">last</span>() { <span class="prelude-val">Some</span>(<span class="ident">seg</span>) <span class="op">=></span> <span class="ident">seg</span>, <span class="prelude-val">None</span> <span class="op">=></span> { <span class="kw">return</span> <span class="bool-val">false</span>; } }; <span class="kw">let</span> <span class="ident">params</span> <span class="op">=</span> <span class="kw">match</span> <span class="ident">seg</span>.<span class="ident">parameters</span> { <span class="ident">syn</span>::<span class="ident">PathParameters</span>::<span class="ident">AngleBracketed</span>(<span class="kw-2">ref</span> <span class="ident">params</span>) <span class="op">=></span> <span class="ident">params</span>, _ <span class="op">=></span> { <span class="kw">return</span> <span class="bool-val">false</span>; } }; <span class="ident">seg</span>.<span class="ident">ident</span> <span class="op">==</span> <span class="string">"Cow"</span> <span class="op">&&</span> <span class="ident">params</span>.<span class="ident">lifetimes</span>.<span class="ident">len</span>() <span class="op">==</span> <span class="number">1</span> <span class="op">&&</span> <span class="ident">params</span>.<span class="ident">types</span> <span class="op">==</span> <span class="macro">vec</span><span class="macro">!</span>[<span class="ident">syn</span>::<span class="ident">parse_type</span>(<span class="ident">elem</span>).<span class="ident">unwrap</span>()] <span class="op">&&</span> <span class="ident">params</span>.<span class="ident">bindings</span>.<span class="ident">is_empty</span>() } <span class="comment">// Whether the type looks like it might be `&T` where elem="T". This can have</span> <span class="comment">// false negatives and false positives.</span> <span class="comment">//</span> <span class="comment">// False negative:</span> <span class="comment">//</span> <span class="comment">// type Yarn = str;</span> <span class="comment">//</span> <span class="comment">// #[derive(Deserialize)]</span> <span class="comment">// struct S<'a> {</span> <span class="comment">// r: &'a Yarn,</span> <span class="comment">// }</span> <span class="comment">//</span> <span class="comment">// False positive:</span> <span class="comment">//</span> <span class="comment">// type str = [i16];</span> <span class="comment">//</span> <span class="comment">// #[derive(Deserialize)]</span> <span class="comment">// struct S<'a> {</span> <span class="comment">// r: &'a str,</span> <span class="comment">// }</span> <span class="kw">fn</span> <span class="ident">is_rptr</span>(<span class="ident">ty</span>: <span class="kw-2">&</span><span class="ident">syn</span>::<span class="ident">Ty</span>, <span class="ident">elem</span>: <span class="kw-2">&</span><span class="ident">str</span>) <span class="op">-></span> <span class="ident">bool</span> { <span class="kw">match</span> <span class="kw-2">*</span><span class="ident">ty</span> { <span class="ident">syn</span>::<span class="ident">Ty</span>::<span class="ident">Rptr</span>(<span class="prelude-val">Some</span>(_), <span class="kw-2">ref</span> <span class="ident">mut_ty</span>) <span class="op">=></span> { <span class="ident">mut_ty</span>.<span class="ident">mutability</span> <span class="op">==</span> <span class="ident">syn</span>::<span class="ident">Mutability</span>::<span class="ident">Immutable</span> <span class="op">&&</span> <span class="ident">mut_ty</span>.<span class="ident">ty</span> <span class="op">==</span> <span class="ident">syn</span>::<span class="ident">parse_type</span>(<span class="ident">elem</span>).<span class="ident">unwrap</span>() } _ <span class="op">=></span> <span class="bool-val">false</span>, } } <span class="comment">// All lifetimes that this type could borrow from a Deserializer.</span> <span class="comment">//</span> <span class="comment">// For example a type `S<'a, 'b>` could borrow `'a` and `'b`. On the other hand</span> <span class="comment">// a type `for<'a> fn(&'a str)` could not borrow `'a` from the Deserializer.</span> <span class="comment">//</span> <span class="comment">// This is used when there is an explicit or implicit `#[serde(borrow)]`</span> <span class="comment">// attribute on the field so there must be at least one borrowable lifetime.</span> <span class="kw">fn</span> <span class="ident">borrowable_lifetimes</span>( <span class="ident">cx</span>: <span class="kw-2">&</span><span class="ident">Ctxt</span>, <span class="ident">name</span>: <span class="kw-2">&</span><span class="ident">str</span>, <span class="ident">ty</span>: <span class="kw-2">&</span><span class="ident">syn</span>::<span class="ident">Ty</span>, ) <span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">BTreeSet</span><span class="op"><</span><span class="ident">syn</span>::<span class="ident">Lifetime</span><span class="op">></span>, ()<span class="op">></span> { <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">lifetimes</span> <span class="op">=</span> <span class="ident">BTreeSet</span>::<span class="ident">new</span>(); <span class="ident">collect_lifetimes</span>(<span class="ident">ty</span>, <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">lifetimes</span>); <span class="kw">if</span> <span class="ident">lifetimes</span>.<span class="ident">is_empty</span>() { <span class="prelude-val">Err</span>(<span class="ident">cx</span>.<span class="ident">error</span>(<span class="macro">format</span><span class="macro">!</span>(<span class="string">"field `{}` has no lifetimes to borrow"</span>, <span class="ident">name</span>)),) } <span class="kw">else</span> { <span class="prelude-val">Ok</span>(<span class="ident">lifetimes</span>) } } <span class="kw">fn</span> <span class="ident">collect_lifetimes</span>(<span class="ident">ty</span>: <span class="kw-2">&</span><span class="ident">syn</span>::<span class="ident">Ty</span>, <span class="ident">out</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">BTreeSet</span><span class="op"><</span><span class="ident">syn</span>::<span class="ident">Lifetime</span><span class="op">></span>) { <span class="kw">match</span> <span class="kw-2">*</span><span class="ident">ty</span> { <span class="ident">syn</span>::<span class="ident">Ty</span>::<span class="ident">Slice</span>(<span class="kw-2">ref</span> <span class="ident">elem</span>) <span class="op">|</span> <span class="ident">syn</span>::<span class="ident">Ty</span>::<span class="ident">Array</span>(<span class="kw-2">ref</span> <span class="ident">elem</span>, _) <span class="op">|</span> <span class="ident">syn</span>::<span class="ident">Ty</span>::<span class="ident">Paren</span>(<span class="kw-2">ref</span> <span class="ident">elem</span>) <span class="op">=></span> { <span class="ident">collect_lifetimes</span>(<span class="ident">elem</span>, <span class="ident">out</span>); } <span class="ident">syn</span>::<span class="ident">Ty</span>::<span class="ident">Ptr</span>(<span class="kw-2">ref</span> <span class="ident">elem</span>) <span class="op">=></span> { <span class="ident">collect_lifetimes</span>(<span class="kw-2">&</span><span class="ident">elem</span>.<span class="ident">ty</span>, <span class="ident">out</span>); } <span class="ident">syn</span>::<span class="ident">Ty</span>::<span class="ident">Rptr</span>(<span class="kw-2">ref</span> <span class="ident">lifetime</span>, <span class="kw-2">ref</span> <span class="ident">elem</span>) <span class="op">=></span> { <span class="ident">out</span>.<span class="ident">extend</span>(<span class="ident">lifetime</span>.<span class="ident">iter</span>().<span class="ident">cloned</span>()); <span class="ident">collect_lifetimes</span>(<span class="kw-2">&</span><span class="ident">elem</span>.<span class="ident">ty</span>, <span class="ident">out</span>); } <span class="ident">syn</span>::<span class="ident">Ty</span>::<span class="ident">Tup</span>(<span class="kw-2">ref</span> <span class="ident">elems</span>) <span class="op">=></span> { <span class="kw">for</span> <span class="ident">elem</span> <span class="kw">in</span> <span class="ident">elems</span> { <span class="ident">collect_lifetimes</span>(<span class="ident">elem</span>, <span class="ident">out</span>); } } <span class="ident">syn</span>::<span class="ident">Ty</span>::<span class="ident">Path</span>(<span class="kw-2">ref</span> <span class="ident">qself</span>, <span class="kw-2">ref</span> <span class="ident">path</span>) <span class="op">=></span> { <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="kw-2">ref</span> <span class="ident">qself</span>) <span class="op">=</span> <span class="kw-2">*</span><span class="ident">qself</span> { <span class="ident">collect_lifetimes</span>(<span class="kw-2">&</span><span class="ident">qself</span>.<span class="ident">ty</span>, <span class="ident">out</span>); } <span class="kw">for</span> <span class="ident">seg</span> <span class="kw">in</span> <span class="kw-2">&</span><span class="ident">path</span>.<span class="ident">segments</span> { <span class="kw">if</span> <span class="kw">let</span> <span class="ident">syn</span>::<span class="ident">PathParameters</span>::<span class="ident">AngleBracketed</span>(<span class="kw-2">ref</span> <span class="ident">params</span>) <span class="op">=</span> <span class="ident">seg</span>.<span class="ident">parameters</span> { <span class="ident">out</span>.<span class="ident">extend</span>(<span class="ident">params</span>.<span class="ident">lifetimes</span>.<span class="ident">iter</span>().<span class="ident">cloned</span>()); <span class="kw">for</span> <span class="ident">ty</span> <span class="kw">in</span> <span class="kw-2">&</span><span class="ident">params</span>.<span class="ident">types</span> { <span class="ident">collect_lifetimes</span>(<span class="ident">ty</span>, <span class="ident">out</span>); } <span class="kw">for</span> <span class="ident">binding</span> <span class="kw">in</span> <span class="kw-2">&</span><span class="ident">params</span>.<span class="ident">bindings</span> { <span class="ident">collect_lifetimes</span>(<span class="kw-2">&</span><span class="ident">binding</span>.<span class="ident">ty</span>, <span class="ident">out</span>); } } } } <span class="ident">syn</span>::<span class="ident">Ty</span>::<span class="ident">BareFn</span>(_) <span class="op">|</span> <span class="ident">syn</span>::<span class="ident">Ty</span>::<span class="ident">Never</span> <span class="op">|</span> <span class="ident">syn</span>::<span class="ident">Ty</span>::<span class="ident">TraitObject</span>(_) <span class="op">|</span> <span class="ident">syn</span>::<span class="ident">Ty</span>::<span class="ident">ImplTrait</span>(_) <span class="op">|</span> <span class="ident">syn</span>::<span class="ident">Ty</span>::<span class="ident">Infer</span> <span class="op">|</span> <span class="ident">syn</span>::<span class="ident">Ty</span>::<span class="ident">Mac</span>(_) <span class="op">=></span> {} } } </pre> </section> <section id='search' class="content hidden"></section> <section class="footer"></section> <aside id="help" class="hidden"> <div> <h1 class="hidden">Help</h1> <div class="shortcuts"> <h2>Keyboard Shortcuts</h2> <dl> <dt>?</dt> <dd>Show this help dialog</dd> <dt>S</dt> <dd>Focus the search field</dd> <dt>⇤</dt> <dd>Move up in search results</dd> <dt>⇥</dt> <dd>Move down in search results</dd> <dt>⏎</dt> <dd>Go to active search result</dd> <dt>+</dt> <dd>Collapse/expand all sections</dd> </dl> </div> <div class="infos"> <h2>Search Tricks</h2> <p> Prefix searches with a type followed by a colon (e.g. <code>fn:</code>) to restrict the search to a given type. </p> <p> Accepted types are: <code>fn</code>, <code>mod</code>, <code>struct</code>, <code>enum</code>, <code>trait</code>, <code>type</code>, <code>macro</code>, and <code>const</code>. </p> <p> Search functions by type signature (e.g. <code>vec -> usize</code> or <code>* -> vec</code>) </p> </div> </div> </aside> <script> window.rootPath = "../../"; 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