| <!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Source of the Rust file `/root/.cargo/registry/src/github.com-1ecc6299db9ec823/prost-derive-0.9.0/src/field/mod.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>mod.rs - source</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceCodePro-Semibold.ttf.woff2"><link rel="stylesheet" href="../../../normalize.css"><link rel="stylesheet" href="../../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" href="../../../ayu.css" disabled><link rel="stylesheet" href="../../../dark.css" disabled><link rel="stylesheet" href="../../../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../../../storage.js"></script><script defer src="../../../source-script.js"></script><script defer src="../../../source-files.js"></script><script defer src="../../../main.js"></script><noscript><link rel="stylesheet" href="../../../noscript.css"></noscript><link rel="alternate icon" type="image/png" href="../../../favicon-16x16.png"><link rel="alternate icon" type="image/png" href="../../../favicon-32x32.png"><link rel="icon" type="image/svg+xml" href="../../../favicon.svg"></head><body class="rustdoc source"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><a class="sidebar-logo" href="../../../prost_derive/index.html"><div class="logo-container"><img class="rust-logo" src="../../../rust-logo.svg" alt="logo"></div></a></nav><main><div class="width-limiter"><nav class="sub"><a class="sub-logo-container" href="../../../prost_derive/index.html"><img class="rust-logo" src="../../../rust-logo.svg" alt="logo"></a><form class="search-form"><div class="search-container"><span></span><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" title="help" tabindex="-1"><a href="../../../help.html">?</a></div><div id="settings-menu" tabindex="-1"><a href="../../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../../wheel.svg"></a></div></div></form></nav><section id="main-content" class="content"><div class="example-wrap"><pre class="src-line-numbers"><span id="1">1</span> |
| <span id="2">2</span> |
| <span id="3">3</span> |
| <span id="4">4</span> |
| <span id="5">5</span> |
| <span id="6">6</span> |
| <span id="7">7</span> |
| <span id="8">8</span> |
| <span id="9">9</span> |
| <span id="10">10</span> |
| <span id="11">11</span> |
| <span id="12">12</span> |
| <span id="13">13</span> |
| <span id="14">14</span> |
| <span id="15">15</span> |
| <span id="16">16</span> |
| <span id="17">17</span> |
| <span id="18">18</span> |
| <span id="19">19</span> |
| <span id="20">20</span> |
| <span id="21">21</span> |
| <span id="22">22</span> |
| <span id="23">23</span> |
| <span id="24">24</span> |
| <span id="25">25</span> |
| <span id="26">26</span> |
| <span id="27">27</span> |
| <span id="28">28</span> |
| <span id="29">29</span> |
| <span id="30">30</span> |
| <span id="31">31</span> |
| <span id="32">32</span> |
| <span id="33">33</span> |
| <span id="34">34</span> |
| <span id="35">35</span> |
| <span id="36">36</span> |
| <span id="37">37</span> |
| <span id="38">38</span> |
| <span id="39">39</span> |
| <span id="40">40</span> |
| <span id="41">41</span> |
| <span id="42">42</span> |
| <span id="43">43</span> |
| <span id="44">44</span> |
| <span id="45">45</span> |
| <span id="46">46</span> |
| <span id="47">47</span> |
| <span id="48">48</span> |
| <span id="49">49</span> |
| <span id="50">50</span> |
| <span id="51">51</span> |
| <span id="52">52</span> |
| <span id="53">53</span> |
| <span id="54">54</span> |
| <span id="55">55</span> |
| <span id="56">56</span> |
| <span id="57">57</span> |
| <span id="58">58</span> |
| <span id="59">59</span> |
| <span id="60">60</span> |
| <span id="61">61</span> |
| <span id="62">62</span> |
| <span id="63">63</span> |
| <span id="64">64</span> |
| <span id="65">65</span> |
| <span id="66">66</span> |
| <span id="67">67</span> |
| <span id="68">68</span> |
| <span id="69">69</span> |
| <span id="70">70</span> |
| <span id="71">71</span> |
| <span id="72">72</span> |
| <span id="73">73</span> |
| <span id="74">74</span> |
| <span id="75">75</span> |
| <span id="76">76</span> |
| <span id="77">77</span> |
| <span id="78">78</span> |
| <span id="79">79</span> |
| <span id="80">80</span> |
| <span id="81">81</span> |
| <span id="82">82</span> |
| <span id="83">83</span> |
| <span id="84">84</span> |
| <span id="85">85</span> |
| <span id="86">86</span> |
| <span id="87">87</span> |
| <span id="88">88</span> |
| <span id="89">89</span> |
| <span id="90">90</span> |
| <span id="91">91</span> |
| <span id="92">92</span> |
| <span id="93">93</span> |
| <span id="94">94</span> |
| <span id="95">95</span> |
| <span id="96">96</span> |
| <span id="97">97</span> |
| <span id="98">98</span> |
| <span id="99">99</span> |
| <span id="100">100</span> |
| <span id="101">101</span> |
| <span id="102">102</span> |
| <span id="103">103</span> |
| <span id="104">104</span> |
| <span id="105">105</span> |
| <span id="106">106</span> |
| <span id="107">107</span> |
| <span id="108">108</span> |
| <span id="109">109</span> |
| <span id="110">110</span> |
| <span id="111">111</span> |
| <span id="112">112</span> |
| <span id="113">113</span> |
| <span id="114">114</span> |
| <span id="115">115</span> |
| <span id="116">116</span> |
| <span id="117">117</span> |
| <span id="118">118</span> |
| <span id="119">119</span> |
| <span id="120">120</span> |
| <span id="121">121</span> |
| <span id="122">122</span> |
| <span id="123">123</span> |
| <span id="124">124</span> |
| <span id="125">125</span> |
| <span id="126">126</span> |
| <span id="127">127</span> |
| <span id="128">128</span> |
| <span id="129">129</span> |
| <span id="130">130</span> |
| <span id="131">131</span> |
| <span id="132">132</span> |
| <span id="133">133</span> |
| <span id="134">134</span> |
| <span id="135">135</span> |
| <span id="136">136</span> |
| <span id="137">137</span> |
| <span id="138">138</span> |
| <span id="139">139</span> |
| <span id="140">140</span> |
| <span id="141">141</span> |
| <span id="142">142</span> |
| <span id="143">143</span> |
| <span id="144">144</span> |
| <span id="145">145</span> |
| <span id="146">146</span> |
| <span id="147">147</span> |
| <span id="148">148</span> |
| <span id="149">149</span> |
| <span id="150">150</span> |
| <span id="151">151</span> |
| <span id="152">152</span> |
| <span id="153">153</span> |
| <span id="154">154</span> |
| <span id="155">155</span> |
| <span id="156">156</span> |
| <span id="157">157</span> |
| <span id="158">158</span> |
| <span id="159">159</span> |
| <span id="160">160</span> |
| <span id="161">161</span> |
| <span id="162">162</span> |
| <span id="163">163</span> |
| <span id="164">164</span> |
| <span id="165">165</span> |
| <span id="166">166</span> |
| <span id="167">167</span> |
| <span id="168">168</span> |
| <span id="169">169</span> |
| <span id="170">170</span> |
| <span id="171">171</span> |
| <span id="172">172</span> |
| <span id="173">173</span> |
| <span id="174">174</span> |
| <span id="175">175</span> |
| <span id="176">176</span> |
| <span id="177">177</span> |
| <span id="178">178</span> |
| <span id="179">179</span> |
| <span id="180">180</span> |
| <span id="181">181</span> |
| <span id="182">182</span> |
| <span id="183">183</span> |
| <span id="184">184</span> |
| <span id="185">185</span> |
| <span id="186">186</span> |
| <span id="187">187</span> |
| <span id="188">188</span> |
| <span id="189">189</span> |
| <span id="190">190</span> |
| <span id="191">191</span> |
| <span id="192">192</span> |
| <span id="193">193</span> |
| <span id="194">194</span> |
| <span id="195">195</span> |
| <span id="196">196</span> |
| <span id="197">197</span> |
| <span id="198">198</span> |
| <span id="199">199</span> |
| <span id="200">200</span> |
| <span id="201">201</span> |
| <span id="202">202</span> |
| <span id="203">203</span> |
| <span id="204">204</span> |
| <span id="205">205</span> |
| <span id="206">206</span> |
| <span id="207">207</span> |
| <span id="208">208</span> |
| <span id="209">209</span> |
| <span id="210">210</span> |
| <span id="211">211</span> |
| <span id="212">212</span> |
| <span id="213">213</span> |
| <span id="214">214</span> |
| <span id="215">215</span> |
| <span id="216">216</span> |
| <span id="217">217</span> |
| <span id="218">218</span> |
| <span id="219">219</span> |
| <span id="220">220</span> |
| <span id="221">221</span> |
| <span id="222">222</span> |
| <span id="223">223</span> |
| <span id="224">224</span> |
| <span id="225">225</span> |
| <span id="226">226</span> |
| <span id="227">227</span> |
| <span id="228">228</span> |
| <span id="229">229</span> |
| <span id="230">230</span> |
| <span id="231">231</span> |
| <span id="232">232</span> |
| <span id="233">233</span> |
| <span id="234">234</span> |
| <span id="235">235</span> |
| <span id="236">236</span> |
| <span id="237">237</span> |
| <span id="238">238</span> |
| <span id="239">239</span> |
| <span id="240">240</span> |
| <span id="241">241</span> |
| <span id="242">242</span> |
| <span id="243">243</span> |
| <span id="244">244</span> |
| <span id="245">245</span> |
| <span id="246">246</span> |
| <span id="247">247</span> |
| <span id="248">248</span> |
| <span id="249">249</span> |
| <span id="250">250</span> |
| <span id="251">251</span> |
| <span id="252">252</span> |
| <span id="253">253</span> |
| <span id="254">254</span> |
| <span id="255">255</span> |
| <span id="256">256</span> |
| <span id="257">257</span> |
| <span id="258">258</span> |
| <span id="259">259</span> |
| <span id="260">260</span> |
| <span id="261">261</span> |
| <span id="262">262</span> |
| <span id="263">263</span> |
| <span id="264">264</span> |
| <span id="265">265</span> |
| <span id="266">266</span> |
| <span id="267">267</span> |
| <span id="268">268</span> |
| <span id="269">269</span> |
| <span id="270">270</span> |
| <span id="271">271</span> |
| <span id="272">272</span> |
| <span id="273">273</span> |
| <span id="274">274</span> |
| <span id="275">275</span> |
| <span id="276">276</span> |
| <span id="277">277</span> |
| <span id="278">278</span> |
| <span id="279">279</span> |
| <span id="280">280</span> |
| <span id="281">281</span> |
| <span id="282">282</span> |
| <span id="283">283</span> |
| <span id="284">284</span> |
| <span id="285">285</span> |
| <span id="286">286</span> |
| <span id="287">287</span> |
| <span id="288">288</span> |
| <span id="289">289</span> |
| <span id="290">290</span> |
| <span id="291">291</span> |
| <span id="292">292</span> |
| <span id="293">293</span> |
| <span id="294">294</span> |
| <span id="295">295</span> |
| <span id="296">296</span> |
| <span id="297">297</span> |
| <span id="298">298</span> |
| <span id="299">299</span> |
| <span id="300">300</span> |
| <span id="301">301</span> |
| <span id="302">302</span> |
| <span id="303">303</span> |
| <span id="304">304</span> |
| <span id="305">305</span> |
| <span id="306">306</span> |
| <span id="307">307</span> |
| <span id="308">308</span> |
| <span id="309">309</span> |
| <span id="310">310</span> |
| <span id="311">311</span> |
| <span id="312">312</span> |
| <span id="313">313</span> |
| <span id="314">314</span> |
| <span id="315">315</span> |
| <span id="316">316</span> |
| <span id="317">317</span> |
| <span id="318">318</span> |
| <span id="319">319</span> |
| <span id="320">320</span> |
| <span id="321">321</span> |
| <span id="322">322</span> |
| <span id="323">323</span> |
| <span id="324">324</span> |
| <span id="325">325</span> |
| <span id="326">326</span> |
| <span id="327">327</span> |
| <span id="328">328</span> |
| <span id="329">329</span> |
| <span id="330">330</span> |
| <span id="331">331</span> |
| <span id="332">332</span> |
| <span id="333">333</span> |
| <span id="334">334</span> |
| <span id="335">335</span> |
| <span id="336">336</span> |
| <span id="337">337</span> |
| <span id="338">338</span> |
| <span id="339">339</span> |
| <span id="340">340</span> |
| <span id="341">341</span> |
| <span id="342">342</span> |
| <span id="343">343</span> |
| <span id="344">344</span> |
| <span id="345">345</span> |
| <span id="346">346</span> |
| <span id="347">347</span> |
| <span id="348">348</span> |
| <span id="349">349</span> |
| <span id="350">350</span> |
| <span id="351">351</span> |
| <span id="352">352</span> |
| <span id="353">353</span> |
| <span id="354">354</span> |
| <span id="355">355</span> |
| <span id="356">356</span> |
| <span id="357">357</span> |
| <span id="358">358</span> |
| <span id="359">359</span> |
| <span id="360">360</span> |
| <span id="361">361</span> |
| <span id="362">362</span> |
| <span id="363">363</span> |
| <span id="364">364</span> |
| <span id="365">365</span> |
| <span id="366">366</span> |
| </pre><pre class="rust"><code><span class="kw">mod </span>group; |
| <span class="kw">mod </span>map; |
| <span class="kw">mod </span>message; |
| <span class="kw">mod </span>oneof; |
| <span class="kw">mod </span>scalar; |
| |
| <span class="kw">use </span>std::fmt; |
| <span class="kw">use </span>std::slice; |
| |
| <span class="kw">use </span>anyhow::{bail, Error}; |
| <span class="kw">use </span>proc_macro2::TokenStream; |
| <span class="kw">use </span>quote::quote; |
| <span class="kw">use </span>syn::{Attribute, Ident, Lit, LitBool, Meta, MetaList, MetaNameValue, NestedMeta}; |
| |
| <span class="attribute">#[derive(Clone)] |
| </span><span class="kw">pub enum </span>Field { |
| <span class="doccomment">/// A scalar field. |
| </span>Scalar(scalar::Field), |
| <span class="doccomment">/// A message field. |
| </span>Message(message::Field), |
| <span class="doccomment">/// A map field. |
| </span>Map(map::Field), |
| <span class="doccomment">/// A oneof field. |
| </span>Oneof(oneof::Field), |
| <span class="doccomment">/// A group field. |
| </span>Group(group::Field), |
| } |
| |
| <span class="kw">impl </span>Field { |
| <span class="doccomment">/// Creates a new `Field` from an iterator of field attributes. |
| /// |
| /// If the meta items are invalid, an error will be returned. |
| /// If the field should be ignored, `None` is returned. |
| </span><span class="kw">pub fn </span>new(attrs: Vec<Attribute>, inferred_tag: <span class="prelude-ty">Option</span><u32>) -> <span class="prelude-ty">Result</span><<span class="prelude-ty">Option</span><Field>, Error> { |
| <span class="kw">let </span>attrs = prost_attrs(attrs); |
| |
| <span class="comment">// TODO: check for ignore attribute. |
| |
| </span><span class="kw">let </span>field = <span class="kw">if let </span><span class="prelude-val">Some</span>(field) = scalar::Field::new(<span class="kw-2">&</span>attrs, inferred_tag)<span class="question-mark">? </span>{ |
| Field::Scalar(field) |
| } <span class="kw">else if let </span><span class="prelude-val">Some</span>(field) = message::Field::new(<span class="kw-2">&</span>attrs, inferred_tag)<span class="question-mark">? </span>{ |
| Field::Message(field) |
| } <span class="kw">else if let </span><span class="prelude-val">Some</span>(field) = map::Field::new(<span class="kw-2">&</span>attrs, inferred_tag)<span class="question-mark">? </span>{ |
| Field::Map(field) |
| } <span class="kw">else if let </span><span class="prelude-val">Some</span>(field) = oneof::Field::new(<span class="kw-2">&</span>attrs)<span class="question-mark">? </span>{ |
| Field::Oneof(field) |
| } <span class="kw">else if let </span><span class="prelude-val">Some</span>(field) = group::Field::new(<span class="kw-2">&</span>attrs, inferred_tag)<span class="question-mark">? </span>{ |
| Field::Group(field) |
| } <span class="kw">else </span>{ |
| <span class="macro">bail!</span>(<span class="string">"no type attribute"</span>); |
| }; |
| |
| <span class="prelude-val">Ok</span>(<span class="prelude-val">Some</span>(field)) |
| } |
| |
| <span class="doccomment">/// Creates a new oneof `Field` from an iterator of field attributes. |
| /// |
| /// If the meta items are invalid, an error will be returned. |
| /// If the field should be ignored, `None` is returned. |
| </span><span class="kw">pub fn </span>new_oneof(attrs: Vec<Attribute>) -> <span class="prelude-ty">Result</span><<span class="prelude-ty">Option</span><Field>, Error> { |
| <span class="kw">let </span>attrs = prost_attrs(attrs); |
| |
| <span class="comment">// TODO: check for ignore attribute. |
| |
| </span><span class="kw">let </span>field = <span class="kw">if let </span><span class="prelude-val">Some</span>(field) = scalar::Field::new_oneof(<span class="kw-2">&</span>attrs)<span class="question-mark">? </span>{ |
| Field::Scalar(field) |
| } <span class="kw">else if let </span><span class="prelude-val">Some</span>(field) = message::Field::new_oneof(<span class="kw-2">&</span>attrs)<span class="question-mark">? </span>{ |
| Field::Message(field) |
| } <span class="kw">else if let </span><span class="prelude-val">Some</span>(field) = map::Field::new_oneof(<span class="kw-2">&</span>attrs)<span class="question-mark">? </span>{ |
| Field::Map(field) |
| } <span class="kw">else if let </span><span class="prelude-val">Some</span>(field) = group::Field::new_oneof(<span class="kw-2">&</span>attrs)<span class="question-mark">? </span>{ |
| Field::Group(field) |
| } <span class="kw">else </span>{ |
| <span class="macro">bail!</span>(<span class="string">"no type attribute for oneof field"</span>); |
| }; |
| |
| <span class="prelude-val">Ok</span>(<span class="prelude-val">Some</span>(field)) |
| } |
| |
| <span class="kw">pub fn </span>tags(<span class="kw-2">&</span><span class="self">self</span>) -> Vec<u32> { |
| <span class="kw">match </span><span class="kw-2">*</span><span class="self">self </span>{ |
| Field::Scalar(<span class="kw-2">ref </span>scalar) => <span class="macro">vec!</span>[scalar.tag], |
| Field::Message(<span class="kw-2">ref </span>message) => <span class="macro">vec!</span>[message.tag], |
| Field::Map(<span class="kw-2">ref </span>map) => <span class="macro">vec!</span>[map.tag], |
| Field::Oneof(<span class="kw-2">ref </span>oneof) => oneof.tags.clone(), |
| Field::Group(<span class="kw-2">ref </span>group) => <span class="macro">vec!</span>[group.tag], |
| } |
| } |
| |
| <span class="doccomment">/// Returns a statement which encodes the field. |
| </span><span class="kw">pub fn </span>encode(<span class="kw-2">&</span><span class="self">self</span>, ident: TokenStream) -> TokenStream { |
| <span class="kw">match </span><span class="kw-2">*</span><span class="self">self </span>{ |
| Field::Scalar(<span class="kw-2">ref </span>scalar) => scalar.encode(ident), |
| Field::Message(<span class="kw-2">ref </span>message) => message.encode(ident), |
| Field::Map(<span class="kw-2">ref </span>map) => map.encode(ident), |
| Field::Oneof(<span class="kw-2">ref </span>oneof) => oneof.encode(ident), |
| Field::Group(<span class="kw-2">ref </span>group) => group.encode(ident), |
| } |
| } |
| |
| <span class="doccomment">/// Returns an expression which evaluates to the result of merging a decoded |
| /// value into the field. |
| </span><span class="kw">pub fn </span>merge(<span class="kw-2">&</span><span class="self">self</span>, ident: TokenStream) -> TokenStream { |
| <span class="kw">match </span><span class="kw-2">*</span><span class="self">self </span>{ |
| Field::Scalar(<span class="kw-2">ref </span>scalar) => scalar.merge(ident), |
| Field::Message(<span class="kw-2">ref </span>message) => message.merge(ident), |
| Field::Map(<span class="kw-2">ref </span>map) => map.merge(ident), |
| Field::Oneof(<span class="kw-2">ref </span>oneof) => oneof.merge(ident), |
| Field::Group(<span class="kw-2">ref </span>group) => group.merge(ident), |
| } |
| } |
| |
| <span class="doccomment">/// Returns an expression which evaluates to the encoded length of the field. |
| </span><span class="kw">pub fn </span>encoded_len(<span class="kw-2">&</span><span class="self">self</span>, ident: TokenStream) -> TokenStream { |
| <span class="kw">match </span><span class="kw-2">*</span><span class="self">self </span>{ |
| Field::Scalar(<span class="kw-2">ref </span>scalar) => scalar.encoded_len(ident), |
| Field::Map(<span class="kw-2">ref </span>map) => map.encoded_len(ident), |
| Field::Message(<span class="kw-2">ref </span>msg) => msg.encoded_len(ident), |
| Field::Oneof(<span class="kw-2">ref </span>oneof) => oneof.encoded_len(ident), |
| Field::Group(<span class="kw-2">ref </span>group) => group.encoded_len(ident), |
| } |
| } |
| |
| <span class="doccomment">/// Returns a statement which clears the field. |
| </span><span class="kw">pub fn </span>clear(<span class="kw-2">&</span><span class="self">self</span>, ident: TokenStream) -> TokenStream { |
| <span class="kw">match </span><span class="kw-2">*</span><span class="self">self </span>{ |
| Field::Scalar(<span class="kw-2">ref </span>scalar) => scalar.clear(ident), |
| Field::Message(<span class="kw-2">ref </span>message) => message.clear(ident), |
| Field::Map(<span class="kw-2">ref </span>map) => map.clear(ident), |
| Field::Oneof(<span class="kw-2">ref </span>oneof) => oneof.clear(ident), |
| Field::Group(<span class="kw-2">ref </span>group) => group.clear(ident), |
| } |
| } |
| |
| <span class="kw">pub fn </span>default(<span class="kw-2">&</span><span class="self">self</span>) -> TokenStream { |
| <span class="kw">match </span><span class="kw-2">*</span><span class="self">self </span>{ |
| Field::Scalar(<span class="kw-2">ref </span>scalar) => scalar.default(), |
| <span class="kw">_ </span>=> <span class="macro">quote!</span>(::core::default::Default::default()), |
| } |
| } |
| |
| <span class="doccomment">/// Produces the fragment implementing debug for the given field. |
| </span><span class="kw">pub fn </span>debug(<span class="kw-2">&</span><span class="self">self</span>, ident: TokenStream) -> TokenStream { |
| <span class="kw">match </span><span class="kw-2">*</span><span class="self">self </span>{ |
| Field::Scalar(<span class="kw-2">ref </span>scalar) => { |
| <span class="kw">let </span>wrapper = scalar.debug(<span class="macro">quote!</span>(ScalarWrapper)); |
| <span class="macro">quote! </span>{ |
| { |
| #wrapper |
| ScalarWrapper(<span class="kw-2">&</span>#ident) |
| } |
| } |
| } |
| Field::Map(<span class="kw-2">ref </span>map) => { |
| <span class="kw">let </span>wrapper = map.debug(<span class="macro">quote!</span>(MapWrapper)); |
| <span class="macro">quote! </span>{ |
| { |
| #wrapper |
| MapWrapper(<span class="kw-2">&</span>#ident) |
| } |
| } |
| } |
| <span class="kw">_ </span>=> <span class="macro">quote!</span>(<span class="kw-2">&</span>#ident), |
| } |
| } |
| |
| <span class="kw">pub fn </span>methods(<span class="kw-2">&</span><span class="self">self</span>, ident: <span class="kw-2">&</span>Ident) -> <span class="prelude-ty">Option</span><TokenStream> { |
| <span class="kw">match </span><span class="kw-2">*</span><span class="self">self </span>{ |
| Field::Scalar(<span class="kw-2">ref </span>scalar) => scalar.methods(ident), |
| Field::Map(<span class="kw-2">ref </span>map) => map.methods(ident), |
| <span class="kw">_ </span>=> <span class="prelude-val">None</span>, |
| } |
| } |
| } |
| |
| <span class="attribute">#[derive(Clone, Copy, PartialEq, Eq)] |
| </span><span class="kw">pub enum </span>Label { |
| <span class="doccomment">/// An optional field. |
| </span>Optional, |
| <span class="doccomment">/// A required field. |
| </span>Required, |
| <span class="doccomment">/// A repeated field. |
| </span>Repeated, |
| } |
| |
| <span class="kw">impl </span>Label { |
| <span class="kw">fn </span>as_str(<span class="self">self</span>) -> <span class="kw-2">&</span><span class="lifetime">'static </span>str { |
| <span class="kw">match </span><span class="self">self </span>{ |
| Label::Optional => <span class="string">"optional"</span>, |
| Label::Required => <span class="string">"required"</span>, |
| Label::Repeated => <span class="string">"repeated"</span>, |
| } |
| } |
| |
| <span class="kw">fn </span>variants() -> slice::Iter<<span class="lifetime">'static</span>, Label> { |
| <span class="kw">const </span>VARIANTS: <span class="kw-2">&</span>[Label] = <span class="kw-2">&</span>[Label::Optional, Label::Required, Label::Repeated]; |
| VARIANTS.iter() |
| } |
| |
| <span class="doccomment">/// Parses a string into a field label. |
| /// If the string doesn't match a field label, `None` is returned. |
| </span><span class="kw">fn </span>from_attr(attr: <span class="kw-2">&</span>Meta) -> <span class="prelude-ty">Option</span><Label> { |
| <span class="kw">if let </span>Meta::Path(<span class="kw-2">ref </span>path) = <span class="kw-2">*</span>attr { |
| <span class="kw">for </span><span class="kw-2">&</span>label <span class="kw">in </span>Label::variants() { |
| <span class="kw">if </span>path.is_ident(label.as_str()) { |
| <span class="kw">return </span><span class="prelude-val">Some</span>(label); |
| } |
| } |
| } |
| <span class="prelude-val">None |
| </span>} |
| } |
| |
| <span class="kw">impl </span>fmt::Debug <span class="kw">for </span>Label { |
| <span class="kw">fn </span>fmt(<span class="kw-2">&</span><span class="self">self</span>, f: <span class="kw-2">&mut </span>fmt::Formatter<<span class="lifetime">'_</span>>) -> fmt::Result { |
| f.write_str(<span class="self">self</span>.as_str()) |
| } |
| } |
| |
| <span class="kw">impl </span>fmt::Display <span class="kw">for </span>Label { |
| <span class="kw">fn </span>fmt(<span class="kw-2">&</span><span class="self">self</span>, f: <span class="kw-2">&mut </span>fmt::Formatter<<span class="lifetime">'_</span>>) -> fmt::Result { |
| f.write_str(<span class="self">self</span>.as_str()) |
| } |
| } |
| |
| <span class="doccomment">/// Get the items belonging to the 'prost' list attribute, e.g. `#[prost(foo, bar="baz")]`. |
| </span><span class="kw">fn </span>prost_attrs(attrs: Vec<Attribute>) -> Vec<Meta> { |
| attrs |
| .iter() |
| .flat_map(Attribute::parse_meta) |
| .flat_map(|meta| <span class="kw">match </span>meta { |
| Meta::List(MetaList { path, nested, .. }) => { |
| <span class="kw">if </span>path.is_ident(<span class="string">"prost"</span>) { |
| nested.into_iter().collect() |
| } <span class="kw">else </span>{ |
| Vec::new() |
| } |
| } |
| <span class="kw">_ </span>=> Vec::new(), |
| }) |
| .flat_map(|attr| -> <span class="prelude-ty">Result</span><<span class="kw">_</span>, <span class="kw">_</span>> { |
| <span class="kw">match </span>attr { |
| NestedMeta::Meta(attr) => <span class="prelude-val">Ok</span>(attr), |
| NestedMeta::Lit(lit) => <span class="macro">bail!</span>(<span class="string">"invalid prost attribute: {:?}"</span>, lit), |
| } |
| }) |
| .collect() |
| } |
| |
| <span class="kw">pub fn </span>set_option<T>(option: <span class="kw-2">&mut </span><span class="prelude-ty">Option</span><T>, value: T, message: <span class="kw-2">&</span>str) -> <span class="prelude-ty">Result</span><(), Error> |
| <span class="kw">where |
| </span>T: fmt::Debug, |
| { |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(<span class="kw-2">ref </span>existing) = <span class="kw-2">*</span>option { |
| <span class="macro">bail!</span>(<span class="string">"{}: {:?} and {:?}"</span>, message, existing, value); |
| } |
| <span class="kw-2">*</span>option = <span class="prelude-val">Some</span>(value); |
| <span class="prelude-val">Ok</span>(()) |
| } |
| |
| <span class="kw">pub fn </span>set_bool(b: <span class="kw-2">&mut </span>bool, message: <span class="kw-2">&</span>str) -> <span class="prelude-ty">Result</span><(), Error> { |
| <span class="kw">if </span><span class="kw-2">*</span>b { |
| <span class="macro">bail!</span>(<span class="string">"{}"</span>, message); |
| } <span class="kw">else </span>{ |
| <span class="kw-2">*</span>b = <span class="bool-val">true</span>; |
| <span class="prelude-val">Ok</span>(()) |
| } |
| } |
| |
| <span class="doccomment">/// Unpacks an attribute into a (key, boolean) pair, returning the boolean value. |
| /// If the key doesn't match the attribute, `None` is returned. |
| </span><span class="kw">fn </span>bool_attr(key: <span class="kw-2">&</span>str, attr: <span class="kw-2">&</span>Meta) -> <span class="prelude-ty">Result</span><<span class="prelude-ty">Option</span><bool>, Error> { |
| <span class="kw">if </span>!attr.path().is_ident(key) { |
| <span class="kw">return </span><span class="prelude-val">Ok</span>(<span class="prelude-val">None</span>); |
| } |
| <span class="kw">match </span><span class="kw-2">*</span>attr { |
| Meta::Path(..) => <span class="prelude-val">Ok</span>(<span class="prelude-val">Some</span>(<span class="bool-val">true</span>)), |
| Meta::List(<span class="kw-2">ref </span>meta_list) => { |
| <span class="comment">// TODO(rustlang/rust#23121): slice pattern matching would make this much nicer. |
| </span><span class="kw">if </span>meta_list.nested.len() == <span class="number">1 </span>{ |
| <span class="kw">if let </span>NestedMeta::Lit(Lit::Bool(LitBool { value, .. })) = meta_list.nested[<span class="number">0</span>] { |
| <span class="kw">return </span><span class="prelude-val">Ok</span>(<span class="prelude-val">Some</span>(value)); |
| } |
| } |
| <span class="macro">bail!</span>(<span class="string">"invalid {} attribute"</span>, key); |
| } |
| Meta::NameValue(MetaNameValue { |
| lit: Lit::Str(<span class="kw-2">ref </span>lit), |
| .. |
| }) => lit |
| .value() |
| .parse::<bool>() |
| .map_err(Error::from) |
| .map(Option::Some), |
| Meta::NameValue(MetaNameValue { |
| lit: Lit::Bool(LitBool { value, .. }), |
| .. |
| }) => <span class="prelude-val">Ok</span>(<span class="prelude-val">Some</span>(value)), |
| <span class="kw">_ </span>=> <span class="macro">bail!</span>(<span class="string">"invalid {} attribute"</span>, key), |
| } |
| } |
| |
| <span class="doccomment">/// Checks if an attribute matches a word. |
| </span><span class="kw">fn </span>word_attr(key: <span class="kw-2">&</span>str, attr: <span class="kw-2">&</span>Meta) -> bool { |
| <span class="kw">if let </span>Meta::Path(<span class="kw-2">ref </span>path) = <span class="kw-2">*</span>attr { |
| path.is_ident(key) |
| } <span class="kw">else </span>{ |
| <span class="bool-val">false |
| </span>} |
| } |
| |
| <span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>tag_attr(attr: <span class="kw-2">&</span>Meta) -> <span class="prelude-ty">Result</span><<span class="prelude-ty">Option</span><u32>, Error> { |
| <span class="kw">if </span>!attr.path().is_ident(<span class="string">"tag"</span>) { |
| <span class="kw">return </span><span class="prelude-val">Ok</span>(<span class="prelude-val">None</span>); |
| } |
| <span class="kw">match </span><span class="kw-2">*</span>attr { |
| Meta::List(<span class="kw-2">ref </span>meta_list) => { |
| <span class="comment">// TODO(rustlang/rust#23121): slice pattern matching would make this much nicer. |
| </span><span class="kw">if </span>meta_list.nested.len() == <span class="number">1 </span>{ |
| <span class="kw">if let </span>NestedMeta::Lit(Lit::Int(<span class="kw-2">ref </span>lit)) = meta_list.nested[<span class="number">0</span>] { |
| <span class="kw">return </span><span class="prelude-val">Ok</span>(<span class="prelude-val">Some</span>(lit.base10_parse()<span class="question-mark">?</span>)); |
| } |
| } |
| <span class="macro">bail!</span>(<span class="string">"invalid tag attribute: {:?}"</span>, attr); |
| } |
| Meta::NameValue(<span class="kw-2">ref </span>meta_name_value) => <span class="kw">match </span>meta_name_value.lit { |
| Lit::Str(<span class="kw-2">ref </span>lit) => lit |
| .value() |
| .parse::<u32>() |
| .map_err(Error::from) |
| .map(Option::Some), |
| Lit::Int(<span class="kw-2">ref </span>lit) => <span class="prelude-val">Ok</span>(<span class="prelude-val">Some</span>(lit.base10_parse()<span class="question-mark">?</span>)), |
| <span class="kw">_ </span>=> <span class="macro">bail!</span>(<span class="string">"invalid tag attribute: {:?}"</span>, attr), |
| }, |
| <span class="kw">_ </span>=> <span class="macro">bail!</span>(<span class="string">"invalid tag attribute: {:?}"</span>, attr), |
| } |
| } |
| |
| <span class="kw">fn </span>tags_attr(attr: <span class="kw-2">&</span>Meta) -> <span class="prelude-ty">Result</span><<span class="prelude-ty">Option</span><Vec<u32>>, Error> { |
| <span class="kw">if </span>!attr.path().is_ident(<span class="string">"tags"</span>) { |
| <span class="kw">return </span><span class="prelude-val">Ok</span>(<span class="prelude-val">None</span>); |
| } |
| <span class="kw">match </span><span class="kw-2">*</span>attr { |
| Meta::List(<span class="kw-2">ref </span>meta_list) => { |
| <span class="kw">let </span><span class="kw-2">mut </span>tags = Vec::with_capacity(meta_list.nested.len()); |
| <span class="kw">for </span>item <span class="kw">in </span><span class="kw-2">&</span>meta_list.nested { |
| <span class="kw">if let </span>NestedMeta::Lit(Lit::Int(<span class="kw-2">ref </span>lit)) = <span class="kw-2">*</span>item { |
| tags.push(lit.base10_parse()<span class="question-mark">?</span>); |
| } <span class="kw">else </span>{ |
| <span class="macro">bail!</span>(<span class="string">"invalid tag attribute: {:?}"</span>, attr); |
| } |
| } |
| <span class="prelude-val">Ok</span>(<span class="prelude-val">Some</span>(tags)) |
| } |
| Meta::NameValue(MetaNameValue { |
| lit: Lit::Str(<span class="kw-2">ref </span>lit), |
| .. |
| }) => lit |
| .value() |
| .split(<span class="string">','</span>) |
| .map(|s| s.trim().parse::<u32>().map_err(Error::from)) |
| .collect::<<span class="prelude-ty">Result</span><Vec<u32>, <span class="kw">_</span>>>() |
| .map(<span class="prelude-val">Some</span>), |
| <span class="kw">_ </span>=> <span class="macro">bail!</span>(<span class="string">"invalid tag attribute: {:?}"</span>, attr), |
| } |
| } |
| </code></pre></div> |
| </section></div></main><div id="rustdoc-vars" data-root-path="../../../" data-current-crate="prost_derive" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |