| <!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/parser/src/input.rs`."><title>input.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"href="../../static.files/${f}">`).join(""))</script><link rel="stylesheet" href="../../static.files/normalize-9960930a.css"><link rel="stylesheet" href="../../static.files/rustdoc-e56847b5.css"><meta name="rustdoc-vars" data-root-path="../../" data-static-root-path="../../static.files/" data-current-crate="parser" data-themes="" data-resource-suffix="" data-rustdoc-version="1.91.0 (f8297e351 2025-10-28)" data-channel="1.91.0" data-search-js="search-e256b49e.js" data-stringdex-js="stringdex-c3e638e9.js" data-settings-js="settings-c38705f0.js" ><script src="../../static.files/storage-e2aeef58.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-6dc2a7f3.js"></script><noscript><link rel="stylesheet" href="../../static.files/noscript-263c88ec.css"></noscript><link rel="alternate icon" type="image/png" href="../../static.files/favicon-32x32-eab170b8.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><section id="main-content" class="content"><div class="main-heading"><h1><div class="sub-heading">parser/</div>input.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">//! See [`Input`]. |
| <a href=#2 id=2 data-nosnippet>2</a> |
| <a href=#3 id=3 data-nosnippet>3</a></span><span class="kw">use </span><span class="kw">crate</span>::SyntaxKind; |
| <a href=#4 id=4 data-nosnippet>4</a> |
| <a href=#5 id=5 data-nosnippet>5</a><span class="attr">#[allow(non_camel_case_types)] |
| <a href=#6 id=6 data-nosnippet>6</a></span><span class="kw">type </span>bits = u64; |
| <a href=#7 id=7 data-nosnippet>7</a> |
| <a href=#8 id=8 data-nosnippet>8</a><span class="doccomment">/// Input for the parser -- a sequence of tokens. |
| <a href=#9 id=9 data-nosnippet>9</a>/// |
| <a href=#10 id=10 data-nosnippet>10</a>/// As of now, parser doesn't have access to the *text* of the tokens, and makes |
| <a href=#11 id=11 data-nosnippet>11</a>/// decisions based solely on their classification. Unlike `LexerToken`, the |
| <a href=#12 id=12 data-nosnippet>12</a>/// `Tokens` doesn't include whitespace and comments. Main input to the parser. |
| <a href=#13 id=13 data-nosnippet>13</a>/// |
| <a href=#14 id=14 data-nosnippet>14</a>/// Struct of arrays internally, but this shouldn't really matter. |
| <a href=#15 id=15 data-nosnippet>15</a></span><span class="kw">pub struct </span>Input { |
| <a href=#16 id=16 data-nosnippet>16</a> kind: Vec<SyntaxKind>, |
| <a href=#17 id=17 data-nosnippet>17</a> joint: Vec<bits>, |
| <a href=#18 id=18 data-nosnippet>18</a> contextual_kind: Vec<SyntaxKind>, |
| <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="doccomment">/// `pub` impl used by callers to create `Tokens`. |
| <a href=#22 id=22 data-nosnippet>22</a></span><span class="kw">impl </span>Input { |
| <a href=#23 id=23 data-nosnippet>23</a> <span class="attr">#[inline] |
| <a href=#24 id=24 data-nosnippet>24</a> </span><span class="kw">pub fn </span>with_capacity(capacity: usize) -> <span class="self">Self </span>{ |
| <a href=#25 id=25 data-nosnippet>25</a> <span class="self">Self </span>{ |
| <a href=#26 id=26 data-nosnippet>26</a> kind: Vec::with_capacity(capacity), |
| <a href=#27 id=27 data-nosnippet>27</a> joint: Vec::with_capacity(capacity / size_of::<bits>()), |
| <a href=#28 id=28 data-nosnippet>28</a> contextual_kind: Vec::with_capacity(capacity), |
| <a href=#29 id=29 data-nosnippet>29</a> } |
| <a href=#30 id=30 data-nosnippet>30</a> } |
| <a href=#31 id=31 data-nosnippet>31</a> <span class="attr">#[inline] |
| <a href=#32 id=32 data-nosnippet>32</a> </span><span class="kw">pub fn </span>push(<span class="kw-2">&mut </span><span class="self">self</span>, kind: SyntaxKind) { |
| <a href=#33 id=33 data-nosnippet>33</a> <span class="self">self</span>.push_impl(kind, SyntaxKind::EOF) |
| <a href=#34 id=34 data-nosnippet>34</a> } |
| <a href=#35 id=35 data-nosnippet>35</a> <span class="attr">#[inline] |
| <a href=#36 id=36 data-nosnippet>36</a> </span><span class="kw">pub fn </span>push_ident(<span class="kw-2">&mut </span><span class="self">self</span>, contextual_kind: SyntaxKind) { |
| <a href=#37 id=37 data-nosnippet>37</a> <span class="self">self</span>.push_impl(SyntaxKind::IDENT, contextual_kind) |
| <a href=#38 id=38 data-nosnippet>38</a> } |
| <a href=#39 id=39 data-nosnippet>39</a> <span class="doccomment">/// Sets jointness for the last token we've pushed. |
| <a href=#40 id=40 data-nosnippet>40</a> /// |
| <a href=#41 id=41 data-nosnippet>41</a> /// This is a separate API rather than an argument to the `push` to make it |
| <a href=#42 id=42 data-nosnippet>42</a> /// convenient both for textual and mbe tokens. With text, you know whether |
| <a href=#43 id=43 data-nosnippet>43</a> /// the *previous* token was joint, with mbe, you know whether the *current* |
| <a href=#44 id=44 data-nosnippet>44</a> /// one is joint. This API allows for styles of usage: |
| <a href=#45 id=45 data-nosnippet>45</a> /// |
| <a href=#46 id=46 data-nosnippet>46</a> /// ```ignore |
| <a href=#47 id=47 data-nosnippet>47</a> /// // In text: |
| <a href=#48 id=48 data-nosnippet>48</a> /// tokens.was_joint(prev_joint); |
| <a href=#49 id=49 data-nosnippet>49</a> /// tokens.push(curr); |
| <a href=#50 id=50 data-nosnippet>50</a> /// |
| <a href=#51 id=51 data-nosnippet>51</a> /// // In MBE: |
| <a href=#52 id=52 data-nosnippet>52</a> /// token.push(curr); |
| <a href=#53 id=53 data-nosnippet>53</a> /// tokens.push(curr_joint) |
| <a href=#54 id=54 data-nosnippet>54</a> /// ``` |
| <a href=#55 id=55 data-nosnippet>55</a> </span><span class="attr">#[inline] |
| <a href=#56 id=56 data-nosnippet>56</a> </span><span class="kw">pub fn </span>was_joint(<span class="kw-2">&mut </span><span class="self">self</span>) { |
| <a href=#57 id=57 data-nosnippet>57</a> <span class="kw">let </span>n = <span class="self">self</span>.len() - <span class="number">1</span>; |
| <a href=#58 id=58 data-nosnippet>58</a> <span class="kw">let </span>(idx, b_idx) = <span class="self">self</span>.bit_index(n); |
| <a href=#59 id=59 data-nosnippet>59</a> <span class="self">self</span>.joint[idx] |= <span class="number">1 </span><< b_idx; |
| <a href=#60 id=60 data-nosnippet>60</a> } |
| <a href=#61 id=61 data-nosnippet>61</a> <span class="attr">#[inline] |
| <a href=#62 id=62 data-nosnippet>62</a> </span><span class="kw">fn </span>push_impl(<span class="kw-2">&mut </span><span class="self">self</span>, kind: SyntaxKind, contextual_kind: SyntaxKind) { |
| <a href=#63 id=63 data-nosnippet>63</a> <span class="kw">let </span>idx = <span class="self">self</span>.len(); |
| <a href=#64 id=64 data-nosnippet>64</a> <span class="kw">if </span>idx.is_multiple_of(bits::BITS <span class="kw">as </span>usize) { |
| <a href=#65 id=65 data-nosnippet>65</a> <span class="self">self</span>.joint.push(<span class="number">0</span>); |
| <a href=#66 id=66 data-nosnippet>66</a> } |
| <a href=#67 id=67 data-nosnippet>67</a> <span class="self">self</span>.kind.push(kind); |
| <a href=#68 id=68 data-nosnippet>68</a> <span class="self">self</span>.contextual_kind.push(contextual_kind); |
| <a href=#69 id=69 data-nosnippet>69</a> } |
| <a href=#70 id=70 data-nosnippet>70</a>} |
| <a href=#71 id=71 data-nosnippet>71</a> |
| <a href=#72 id=72 data-nosnippet>72</a><span class="doccomment">/// pub(crate) impl used by the parser to consume `Tokens`. |
| <a href=#73 id=73 data-nosnippet>73</a></span><span class="kw">impl </span>Input { |
| <a href=#74 id=74 data-nosnippet>74</a> <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>kind(<span class="kw-2">&</span><span class="self">self</span>, idx: usize) -> SyntaxKind { |
| <a href=#75 id=75 data-nosnippet>75</a> <span class="self">self</span>.kind.get(idx).copied().unwrap_or(SyntaxKind::EOF) |
| <a href=#76 id=76 data-nosnippet>76</a> } |
| <a href=#77 id=77 data-nosnippet>77</a> <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>contextual_kind(<span class="kw-2">&</span><span class="self">self</span>, idx: usize) -> SyntaxKind { |
| <a href=#78 id=78 data-nosnippet>78</a> <span class="self">self</span>.contextual_kind.get(idx).copied().unwrap_or(SyntaxKind::EOF) |
| <a href=#79 id=79 data-nosnippet>79</a> } |
| <a href=#80 id=80 data-nosnippet>80</a> <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>is_joint(<span class="kw-2">&</span><span class="self">self</span>, n: usize) -> bool { |
| <a href=#81 id=81 data-nosnippet>81</a> <span class="kw">let </span>(idx, b_idx) = <span class="self">self</span>.bit_index(n); |
| <a href=#82 id=82 data-nosnippet>82</a> <span class="self">self</span>.joint[idx] & (<span class="number">1 </span><< b_idx) != <span class="number">0 |
| <a href=#83 id=83 data-nosnippet>83</a> </span>} |
| <a href=#84 id=84 data-nosnippet>84</a>} |
| <a href=#85 id=85 data-nosnippet>85</a> |
| <a href=#86 id=86 data-nosnippet>86</a><span class="kw">impl </span>Input { |
| <a href=#87 id=87 data-nosnippet>87</a> <span class="kw">fn </span>bit_index(<span class="kw-2">&</span><span class="self">self</span>, n: usize) -> (usize, usize) { |
| <a href=#88 id=88 data-nosnippet>88</a> <span class="kw">let </span>idx = n / (bits::BITS <span class="kw">as </span>usize); |
| <a href=#89 id=89 data-nosnippet>89</a> <span class="kw">let </span>b_idx = n % (bits::BITS <span class="kw">as </span>usize); |
| <a href=#90 id=90 data-nosnippet>90</a> (idx, b_idx) |
| <a href=#91 id=91 data-nosnippet>91</a> } |
| <a href=#92 id=92 data-nosnippet>92</a> <span class="kw">fn </span>len(<span class="kw-2">&</span><span class="self">self</span>) -> usize { |
| <a href=#93 id=93 data-nosnippet>93</a> <span class="self">self</span>.kind.len() |
| <a href=#94 id=94 data-nosnippet>94</a> } |
| <a href=#95 id=95 data-nosnippet>95</a>}</code></pre></div></section></main></body></html> |
