| <!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 `crates/syntax/src/fuzz.rs`."><title>fuzz.rs - source</title><script>if(window.location.protocol!=="file:")document.head.insertAdjacentHTML("beforeend","SourceSerif4-Regular-6b053e98.ttf.woff2,FiraSans-Italic-81dc35de.woff2,FiraSans-Regular-0fe48ade.woff2,FiraSans-MediumItalic-ccf7e434.woff2,FiraSans-Medium-e1aa3f0a.woff2,SourceCodePro-Regular-8badfe75.ttf.woff2,SourceCodePro-Semibold-aa29a496.ttf.woff2".split(",").map(f=>`<link rel="preload" as="font" type="font/woff2" crossorigin href="../../static.files/${f}">`).join(""))</script><link rel="stylesheet" href="../../static.files/normalize-9960930a.css"><link rel="stylesheet" href="../../static.files/rustdoc-84e720fa.css"><meta name="rustdoc-vars" data-root-path="../../" data-static-root-path="../../static.files/" data-current-crate="syntax" data-themes="" data-resource-suffix="" data-rustdoc-version="1.89.0 (29483883e 2025-08-04)" data-channel="1.89.0" data-search-js="search-92309212.js" data-settings-js="settings-5514c975.js" ><script src="../../static.files/storage-4e99c027.js"></script><script defer src="../../static.files/src-script-813739b1.js"></script><script defer src="../../src-files.js"></script><script defer src="../../static.files/main-fd3af306.js"></script><noscript><link rel="stylesheet" href="../../static.files/noscript-32bb7600.css"></noscript><link rel="alternate icon" type="image/png" href="../../static.files/favicon-32x32-6580c154.png"><link rel="icon" type="image/svg+xml" href="../../static.files/favicon-044be391.svg"></head><body class="rustdoc src"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><div class="src-sidebar-title"><h2>Files</h2></div></nav><div class="sidebar-resizer" title="Drag to resize sidebar"></div><main><rustdoc-search></rustdoc-search><section id="main-content" class="content"><div class="main-heading"><h1><div class="sub-heading">syntax/</div>fuzz.rs</h1><rustdoc-toolbar></rustdoc-toolbar></div><div class="example-wrap digits-2"><pre class="rust"><code><a href=#1 id=1 data-nosnippet>1</a><span class="doccomment">//! Some infrastructure for fuzzy testing. |
| <a href=#2 id=2 data-nosnippet>2</a>//! |
| <a href=#3 id=3 data-nosnippet>3</a>//! We don't normally run fuzzying, so this is hopelessly bitrotten :( |
| <a href=#4 id=4 data-nosnippet>4</a> |
| <a href=#5 id=5 data-nosnippet>5</a></span><span class="kw">use </span>std::str::{<span class="self">self</span>, FromStr}; |
| <a href=#6 id=6 data-nosnippet>6</a> |
| <a href=#7 id=7 data-nosnippet>7</a><span class="kw">use </span>parser::Edition; |
| <a href=#8 id=8 data-nosnippet>8</a> |
| <a href=#9 id=9 data-nosnippet>9</a><span class="kw">use crate</span>::{AstNode, SourceFile, TextRange, validation}; |
| <a href=#10 id=10 data-nosnippet>10</a> |
| <a href=#11 id=11 data-nosnippet>11</a><span class="kw">fn </span>check_file_invariants(file: <span class="kw-2">&</span>SourceFile) { |
| <a href=#12 id=12 data-nosnippet>12</a> <span class="kw">let </span>root = file.syntax(); |
| <a href=#13 id=13 data-nosnippet>13</a> validation::validate_block_structure(root); |
| <a href=#14 id=14 data-nosnippet>14</a>} |
| <a href=#15 id=15 data-nosnippet>15</a> |
| <a href=#16 id=16 data-nosnippet>16</a><span class="kw">pub fn </span>check_parser(text: <span class="kw-2">&</span>str) { |
| <a href=#17 id=17 data-nosnippet>17</a> <span class="kw">let </span>file = SourceFile::parse(text, Edition::CURRENT); |
| <a href=#18 id=18 data-nosnippet>18</a> check_file_invariants(<span class="kw-2">&</span>file.tree()); |
| <a href=#19 id=19 data-nosnippet>19</a>} |
| <a href=#20 id=20 data-nosnippet>20</a> |
| <a href=#21 id=21 data-nosnippet>21</a><span class="attr">#[derive(Debug, Clone)] |
| <a href=#22 id=22 data-nosnippet>22</a></span><span class="kw">pub struct </span>CheckReparse { |
| <a href=#23 id=23 data-nosnippet>23</a> text: String, |
| <a href=#24 id=24 data-nosnippet>24</a> delete: TextRange, |
| <a href=#25 id=25 data-nosnippet>25</a> insert: String, |
| <a href=#26 id=26 data-nosnippet>26</a> edited_text: String, |
| <a href=#27 id=27 data-nosnippet>27</a>} |
| <a href=#28 id=28 data-nosnippet>28</a> |
| <a href=#29 id=29 data-nosnippet>29</a><span class="kw">impl </span>CheckReparse { |
| <a href=#30 id=30 data-nosnippet>30</a> <span class="kw">pub fn </span>from_data(data: <span class="kw-2">&</span>[u8]) -> <span class="prelude-ty">Option</span><<span class="self">Self</span>> { |
| <a href=#31 id=31 data-nosnippet>31</a> <span class="kw">const </span>PREFIX: <span class="kw-2">&</span>str = <span class="string">"fn main(){\n\t"</span>; |
| <a href=#32 id=32 data-nosnippet>32</a> <span class="kw">const </span>SUFFIX: <span class="kw-2">&</span>str = <span class="string">"\n}"</span>; |
| <a href=#33 id=33 data-nosnippet>33</a> |
| <a href=#34 id=34 data-nosnippet>34</a> <span class="kw">let </span>data = str::from_utf8(data).ok()<span class="question-mark">?</span>; |
| <a href=#35 id=35 data-nosnippet>35</a> <span class="kw">let </span><span class="kw-2">mut </span>lines = data.lines(); |
| <a href=#36 id=36 data-nosnippet>36</a> <span class="kw">let </span>delete_start = usize::from_str(lines.next()<span class="question-mark">?</span>).ok()<span class="question-mark">? </span>+ PREFIX.len(); |
| <a href=#37 id=37 data-nosnippet>37</a> <span class="kw">let </span>delete_len = usize::from_str(lines.next()<span class="question-mark">?</span>).ok()<span class="question-mark">?</span>; |
| <a href=#38 id=38 data-nosnippet>38</a> <span class="kw">let </span>insert = lines.next()<span class="question-mark">?</span>.to_owned(); |
| <a href=#39 id=39 data-nosnippet>39</a> <span class="kw">let </span>text = lines.collect::<Vec<<span class="kw">_</span>>>().join(<span class="string">"\n"</span>); |
| <a href=#40 id=40 data-nosnippet>40</a> <span class="kw">let </span>text = <span class="macro">format!</span>(<span class="string">"{PREFIX}{text}{SUFFIX}"</span>); |
| <a href=#41 id=41 data-nosnippet>41</a> text.get(delete_start..delete_start.checked_add(delete_len)<span class="question-mark">?</span>)<span class="question-mark">?</span>; <span class="comment">// make sure delete is a valid range |
| <a href=#42 id=42 data-nosnippet>42</a> </span><span class="kw">let </span>delete = |
| <a href=#43 id=43 data-nosnippet>43</a> TextRange::at(delete_start.try_into().unwrap(), delete_len.try_into().unwrap()); |
| <a href=#44 id=44 data-nosnippet>44</a> <span class="kw">let </span>edited_text = |
| <a href=#45 id=45 data-nosnippet>45</a> <span class="macro">format!</span>(<span class="string">"{}{}{}"</span>, <span class="kw-2">&</span>text[..delete_start], <span class="kw-2">&</span>insert, <span class="kw-2">&</span>text[delete_start + delete_len..]); |
| <a href=#46 id=46 data-nosnippet>46</a> <span class="prelude-val">Some</span>(CheckReparse { text, insert, delete, edited_text }) |
| <a href=#47 id=47 data-nosnippet>47</a> } |
| <a href=#48 id=48 data-nosnippet>48</a> |
| <a href=#49 id=49 data-nosnippet>49</a> <span class="attr">#[allow(clippy::print_stderr)] |
| <a href=#50 id=50 data-nosnippet>50</a> </span><span class="kw">pub fn </span>run(<span class="kw-2">&</span><span class="self">self</span>) { |
| <a href=#51 id=51 data-nosnippet>51</a> <span class="kw">let </span>parse = SourceFile::parse(<span class="kw-2">&</span><span class="self">self</span>.text, Edition::CURRENT); |
| <a href=#52 id=52 data-nosnippet>52</a> <span class="kw">let </span>new_parse = parse.reparse(<span class="self">self</span>.delete, <span class="kw-2">&</span><span class="self">self</span>.insert, Edition::CURRENT); |
| <a href=#53 id=53 data-nosnippet>53</a> check_file_invariants(<span class="kw-2">&</span>new_parse.tree()); |
| <a href=#54 id=54 data-nosnippet>54</a> <span class="macro">assert_eq!</span>(<span class="kw-2">&</span>new_parse.tree().syntax().text().to_string(), <span class="kw-2">&</span><span class="self">self</span>.edited_text); |
| <a href=#55 id=55 data-nosnippet>55</a> <span class="kw">let </span>full_reparse = SourceFile::parse(<span class="kw-2">&</span><span class="self">self</span>.edited_text, Edition::CURRENT); |
| <a href=#56 id=56 data-nosnippet>56</a> <span class="kw">for </span>(a, b) <span class="kw">in |
| <a href=#57 id=57 data-nosnippet>57</a> </span>new_parse.tree().syntax().descendants().zip(full_reparse.tree().syntax().descendants()) |
| <a href=#58 id=58 data-nosnippet>58</a> { |
| <a href=#59 id=59 data-nosnippet>59</a> <span class="kw">if </span>(a.kind(), a.text_range()) != (b.kind(), b.text_range()) { |
| <a href=#60 id=60 data-nosnippet>60</a> <span class="macro">eprint!</span>(<span class="string">"original:\n{:#?}"</span>, parse.tree().syntax()); |
| <a href=#61 id=61 data-nosnippet>61</a> <span class="macro">eprint!</span>(<span class="string">"reparsed:\n{:#?}"</span>, new_parse.tree().syntax()); |
| <a href=#62 id=62 data-nosnippet>62</a> <span class="macro">eprint!</span>(<span class="string">"full reparse:\n{:#?}"</span>, full_reparse.tree().syntax()); |
| <a href=#63 id=63 data-nosnippet>63</a> <span class="macro">assert_eq!</span>( |
| <a href=#64 id=64 data-nosnippet>64</a> <span class="macro">format!</span>(<span class="string">"{a:?}"</span>), |
| <a href=#65 id=65 data-nosnippet>65</a> <span class="macro">format!</span>(<span class="string">"{b:?}"</span>), |
| <a href=#66 id=66 data-nosnippet>66</a> <span class="string">"different syntax tree produced by the full reparse" |
| <a href=#67 id=67 data-nosnippet>67</a> </span>); |
| <a href=#68 id=68 data-nosnippet>68</a> } |
| <a href=#69 id=69 data-nosnippet>69</a> } |
| <a href=#70 id=70 data-nosnippet>70</a> <span class="comment">// FIXME |
| <a href=#71 id=71 data-nosnippet>71</a> // assert_eq!(new_file.errors(), full_reparse.errors()); |
| <a href=#72 id=72 data-nosnippet>72</a> </span>} |
| <a href=#73 id=73 data-nosnippet>73</a>}</code></pre></div></section></main></body></html> |
