| <!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/parser.rs`."><title>parser.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="parser" 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">parser/</div>parser.rs</h1><rustdoc-toolbar></rustdoc-toolbar></div><div class="example-wrap digits-3"><pre class="rust"><code><a href=#1 id=1 data-nosnippet>1</a><span class="doccomment">//! See [`Parser`]. |
| <a href=#2 id=2 data-nosnippet>2</a> |
| <a href=#3 id=3 data-nosnippet>3</a></span><span class="kw">use </span>std::cell::Cell; |
| <a href=#4 id=4 data-nosnippet>4</a> |
| <a href=#5 id=5 data-nosnippet>5</a><span class="kw">use </span>drop_bomb::DropBomb; |
| <a href=#6 id=6 data-nosnippet>6</a> |
| <a href=#7 id=7 data-nosnippet>7</a><span class="kw">use crate</span>::{ |
| <a href=#8 id=8 data-nosnippet>8</a> Edition, |
| <a href=#9 id=9 data-nosnippet>9</a> SyntaxKind::{<span class="self">self</span>, EOF, ERROR, TOMBSTONE}, |
| <a href=#10 id=10 data-nosnippet>10</a> T, TokenSet, |
| <a href=#11 id=11 data-nosnippet>11</a> event::Event, |
| <a href=#12 id=12 data-nosnippet>12</a> input::Input, |
| <a href=#13 id=13 data-nosnippet>13</a>}; |
| <a href=#14 id=14 data-nosnippet>14</a> |
| <a href=#15 id=15 data-nosnippet>15</a><span class="doccomment">/// `Parser` struct provides the low-level API for |
| <a href=#16 id=16 data-nosnippet>16</a>/// navigating through the stream of tokens and |
| <a href=#17 id=17 data-nosnippet>17</a>/// constructing the parse tree. The actual parsing |
| <a href=#18 id=18 data-nosnippet>18</a>/// happens in the [`grammar`](super::grammar) module. |
| <a href=#19 id=19 data-nosnippet>19</a>/// |
| <a href=#20 id=20 data-nosnippet>20</a>/// However, the result of this `Parser` is not a real |
| <a href=#21 id=21 data-nosnippet>21</a>/// tree, but rather a flat stream of events of the form |
| <a href=#22 id=22 data-nosnippet>22</a>/// "start expression, consume number literal, |
| <a href=#23 id=23 data-nosnippet>23</a>/// finish expression". See `Event` docs for more. |
| <a href=#24 id=24 data-nosnippet>24</a></span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">struct </span>Parser<<span class="lifetime">'t</span>> { |
| <a href=#25 id=25 data-nosnippet>25</a> inp: <span class="kw-2">&</span><span class="lifetime">'t </span>Input, |
| <a href=#26 id=26 data-nosnippet>26</a> pos: usize, |
| <a href=#27 id=27 data-nosnippet>27</a> events: Vec<Event>, |
| <a href=#28 id=28 data-nosnippet>28</a> steps: Cell<u32>, |
| <a href=#29 id=29 data-nosnippet>29</a> edition: Edition, |
| <a href=#30 id=30 data-nosnippet>30</a>} |
| <a href=#31 id=31 data-nosnippet>31</a> |
| <a href=#32 id=32 data-nosnippet>32</a><span class="kw">const </span>PARSER_STEP_LIMIT: usize = <span class="kw">if </span><span class="macro">cfg!</span>(debug_assertions) { <span class="number">150_000 </span>} <span class="kw">else </span>{ <span class="number">15_000_000 </span>}; |
| <a href=#33 id=33 data-nosnippet>33</a> |
| <a href=#34 id=34 data-nosnippet>34</a><span class="kw">impl</span><<span class="lifetime">'t</span>> Parser<<span class="lifetime">'t</span>> { |
| <a href=#35 id=35 data-nosnippet>35</a> <span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>new(inp: <span class="kw-2">&</span><span class="lifetime">'t </span>Input, edition: Edition) -> Parser<<span class="lifetime">'t</span>> { |
| <a href=#36 id=36 data-nosnippet>36</a> Parser { inp, pos: <span class="number">0</span>, events: Vec::new(), steps: Cell::new(<span class="number">0</span>), edition } |
| <a href=#37 id=37 data-nosnippet>37</a> } |
| <a href=#38 id=38 data-nosnippet>38</a> |
| <a href=#39 id=39 data-nosnippet>39</a> <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>finish(<span class="self">self</span>) -> Vec<Event> { |
| <a href=#40 id=40 data-nosnippet>40</a> <span class="self">self</span>.events |
| <a href=#41 id=41 data-nosnippet>41</a> } |
| <a href=#42 id=42 data-nosnippet>42</a> |
| <a href=#43 id=43 data-nosnippet>43</a> <span class="doccomment">/// Returns the kind of the current token. |
| <a href=#44 id=44 data-nosnippet>44</a> /// If parser has already reached the end of input, |
| <a href=#45 id=45 data-nosnippet>45</a> /// the special `EOF` kind is returned. |
| <a href=#46 id=46 data-nosnippet>46</a> </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>current(<span class="kw-2">&</span><span class="self">self</span>) -> SyntaxKind { |
| <a href=#47 id=47 data-nosnippet>47</a> <span class="self">self</span>.nth(<span class="number">0</span>) |
| <a href=#48 id=48 data-nosnippet>48</a> } |
| <a href=#49 id=49 data-nosnippet>49</a> |
| <a href=#50 id=50 data-nosnippet>50</a> <span class="doccomment">/// Lookahead operation: returns the kind of the next nth |
| <a href=#51 id=51 data-nosnippet>51</a> /// token. |
| <a href=#52 id=52 data-nosnippet>52</a> </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>nth(<span class="kw-2">&</span><span class="self">self</span>, n: usize) -> SyntaxKind { |
| <a href=#53 id=53 data-nosnippet>53</a> <span class="macro">assert!</span>(n <= <span class="number">3</span>); |
| <a href=#54 id=54 data-nosnippet>54</a> |
| <a href=#55 id=55 data-nosnippet>55</a> <span class="kw">let </span>steps = <span class="self">self</span>.steps.get(); |
| <a href=#56 id=56 data-nosnippet>56</a> <span class="macro">assert!</span>((steps <span class="kw">as </span>usize) < PARSER_STEP_LIMIT, <span class="string">"the parser seems stuck"</span>); |
| <a href=#57 id=57 data-nosnippet>57</a> <span class="self">self</span>.steps.set(steps + <span class="number">1</span>); |
| <a href=#58 id=58 data-nosnippet>58</a> |
| <a href=#59 id=59 data-nosnippet>59</a> <span class="self">self</span>.inp.kind(<span class="self">self</span>.pos + n) |
| <a href=#60 id=60 data-nosnippet>60</a> } |
| <a href=#61 id=61 data-nosnippet>61</a> |
| <a href=#62 id=62 data-nosnippet>62</a> <span class="doccomment">/// Checks if the current token is `kind`. |
| <a href=#63 id=63 data-nosnippet>63</a> </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>at(<span class="kw-2">&</span><span class="self">self</span>, kind: SyntaxKind) -> bool { |
| <a href=#64 id=64 data-nosnippet>64</a> <span class="self">self</span>.nth_at(<span class="number">0</span>, kind) |
| <a href=#65 id=65 data-nosnippet>65</a> } |
| <a href=#66 id=66 data-nosnippet>66</a> |
| <a href=#67 id=67 data-nosnippet>67</a> <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>nth_at(<span class="kw-2">&</span><span class="self">self</span>, n: usize, kind: SyntaxKind) -> bool { |
| <a href=#68 id=68 data-nosnippet>68</a> <span class="kw">match </span>kind { |
| <a href=#69 id=69 data-nosnippet>69</a> <span class="macro">T!</span>[-=] => <span class="self">self</span>.at_composite2(n, <span class="macro">T!</span>[-], <span class="macro">T!</span>[=]), |
| <a href=#70 id=70 data-nosnippet>70</a> <span class="macro">T!</span>[->] => <span class="self">self</span>.at_composite2(n, <span class="macro">T!</span>[-], <span class="macro">T!</span>[>]), |
| <a href=#71 id=71 data-nosnippet>71</a> <span class="macro">T!</span>[::] => <span class="self">self</span>.at_composite2(n, <span class="macro">T!</span>[:], <span class="macro">T!</span>[:]), |
| <a href=#72 id=72 data-nosnippet>72</a> <span class="macro">T!</span>[!=] => <span class="self">self</span>.at_composite2(n, <span class="macro">T!</span>[!], <span class="macro">T!</span>[=]), |
| <a href=#73 id=73 data-nosnippet>73</a> <span class="macro">T!</span>[..] => <span class="self">self</span>.at_composite2(n, <span class="macro">T!</span>[.], <span class="macro">T!</span>[.]), |
| <a href=#74 id=74 data-nosnippet>74</a> <span class="macro">T!</span>[<span class="kw-2">*</span>=] => <span class="self">self</span>.at_composite2(n, <span class="macro">T!</span>[<span class="kw-2">*</span>], <span class="macro">T!</span>[=]), |
| <a href=#75 id=75 data-nosnippet>75</a> <span class="macro">T!</span>[/=] => <span class="self">self</span>.at_composite2(n, <span class="macro">T!</span>[/], <span class="macro">T!</span>[=]), |
| <a href=#76 id=76 data-nosnippet>76</a> <span class="macro">T!</span>[&&] => <span class="self">self</span>.at_composite2(n, <span class="macro">T!</span>[<span class="kw-2">&</span>], <span class="macro">T!</span>[<span class="kw-2">&</span>]), |
| <a href=#77 id=77 data-nosnippet>77</a> <span class="macro">T!</span>[&=] => <span class="self">self</span>.at_composite2(n, <span class="macro">T!</span>[<span class="kw-2">&</span>], <span class="macro">T!</span>[=]), |
| <a href=#78 id=78 data-nosnippet>78</a> <span class="macro">T!</span>[%=] => <span class="self">self</span>.at_composite2(n, <span class="macro">T!</span>[%], <span class="macro">T!</span>[=]), |
| <a href=#79 id=79 data-nosnippet>79</a> <span class="macro">T!</span>[^=] => <span class="self">self</span>.at_composite2(n, <span class="macro">T!</span>[^], <span class="macro">T!</span>[=]), |
| <a href=#80 id=80 data-nosnippet>80</a> <span class="macro">T!</span>[+=] => <span class="self">self</span>.at_composite2(n, <span class="macro">T!</span>[+], <span class="macro">T!</span>[=]), |
| <a href=#81 id=81 data-nosnippet>81</a> <span class="macro">T!</span>[<<] => <span class="self">self</span>.at_composite2(n, <span class="macro">T!</span>[<], <span class="macro">T!</span>[<]), |
| <a href=#82 id=82 data-nosnippet>82</a> <span class="macro">T!</span>[<=] => <span class="self">self</span>.at_composite2(n, <span class="macro">T!</span>[<], <span class="macro">T!</span>[=]), |
| <a href=#83 id=83 data-nosnippet>83</a> <span class="macro">T!</span>[==] => <span class="self">self</span>.at_composite2(n, <span class="macro">T!</span>[=], <span class="macro">T!</span>[=]), |
| <a href=#84 id=84 data-nosnippet>84</a> <span class="macro">T!</span>[=>] => <span class="self">self</span>.at_composite2(n, <span class="macro">T!</span>[=], <span class="macro">T!</span>[>]), |
| <a href=#85 id=85 data-nosnippet>85</a> <span class="macro">T!</span>[>=] => <span class="self">self</span>.at_composite2(n, <span class="macro">T!</span>[>], <span class="macro">T!</span>[=]), |
| <a href=#86 id=86 data-nosnippet>86</a> <span class="macro">T!</span>[>>] => <span class="self">self</span>.at_composite2(n, <span class="macro">T!</span>[>], <span class="macro">T!</span>[>]), |
| <a href=#87 id=87 data-nosnippet>87</a> <span class="macro">T!</span>[|=] => <span class="self">self</span>.at_composite2(n, <span class="macro">T!</span>[|], <span class="macro">T!</span>[=]), |
| <a href=#88 id=88 data-nosnippet>88</a> <span class="macro">T!</span>[||] => <span class="self">self</span>.at_composite2(n, <span class="macro">T!</span>[|], <span class="macro">T!</span>[|]), |
| <a href=#89 id=89 data-nosnippet>89</a> |
| <a href=#90 id=90 data-nosnippet>90</a> <span class="macro">T!</span>[...] => <span class="self">self</span>.at_composite3(n, <span class="macro">T!</span>[.], <span class="macro">T!</span>[.], <span class="macro">T!</span>[.]), |
| <a href=#91 id=91 data-nosnippet>91</a> <span class="macro">T!</span>[..=] => <span class="self">self</span>.at_composite3(n, <span class="macro">T!</span>[.], <span class="macro">T!</span>[.], <span class="macro">T!</span>[=]), |
| <a href=#92 id=92 data-nosnippet>92</a> <span class="macro">T!</span>[<<=] => <span class="self">self</span>.at_composite3(n, <span class="macro">T!</span>[<], <span class="macro">T!</span>[<], <span class="macro">T!</span>[=]), |
| <a href=#93 id=93 data-nosnippet>93</a> <span class="macro">T!</span>[>>=] => <span class="self">self</span>.at_composite3(n, <span class="macro">T!</span>[>], <span class="macro">T!</span>[>], <span class="macro">T!</span>[=]), |
| <a href=#94 id=94 data-nosnippet>94</a> |
| <a href=#95 id=95 data-nosnippet>95</a> <span class="kw">_ </span>=> <span class="self">self</span>.inp.kind(<span class="self">self</span>.pos + n) == kind, |
| <a href=#96 id=96 data-nosnippet>96</a> } |
| <a href=#97 id=97 data-nosnippet>97</a> } |
| <a href=#98 id=98 data-nosnippet>98</a> |
| <a href=#99 id=99 data-nosnippet>99</a> <span class="doccomment">/// Consume the next token if `kind` matches. |
| <a href=#100 id=100 data-nosnippet>100</a> </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>eat(<span class="kw-2">&mut </span><span class="self">self</span>, kind: SyntaxKind) -> bool { |
| <a href=#101 id=101 data-nosnippet>101</a> <span class="kw">if </span>!<span class="self">self</span>.at(kind) { |
| <a href=#102 id=102 data-nosnippet>102</a> <span class="kw">return </span><span class="bool-val">false</span>; |
| <a href=#103 id=103 data-nosnippet>103</a> } |
| <a href=#104 id=104 data-nosnippet>104</a> <span class="kw">let </span>n_raw_tokens = <span class="kw">match </span>kind { |
| <a href=#105 id=105 data-nosnippet>105</a> <span class="macro">T!</span>[-=] |
| <a href=#106 id=106 data-nosnippet>106</a> | <span class="macro">T!</span>[->] |
| <a href=#107 id=107 data-nosnippet>107</a> | <span class="macro">T!</span>[::] |
| <a href=#108 id=108 data-nosnippet>108</a> | <span class="macro">T!</span>[!=] |
| <a href=#109 id=109 data-nosnippet>109</a> | <span class="macro">T!</span>[..] |
| <a href=#110 id=110 data-nosnippet>110</a> | <span class="macro">T!</span>[<span class="kw-2">*</span>=] |
| <a href=#111 id=111 data-nosnippet>111</a> | <span class="macro">T!</span>[/=] |
| <a href=#112 id=112 data-nosnippet>112</a> | <span class="macro">T!</span>[&&] |
| <a href=#113 id=113 data-nosnippet>113</a> | <span class="macro">T!</span>[&=] |
| <a href=#114 id=114 data-nosnippet>114</a> | <span class="macro">T!</span>[%=] |
| <a href=#115 id=115 data-nosnippet>115</a> | <span class="macro">T!</span>[^=] |
| <a href=#116 id=116 data-nosnippet>116</a> | <span class="macro">T!</span>[+=] |
| <a href=#117 id=117 data-nosnippet>117</a> | <span class="macro">T!</span>[<<] |
| <a href=#118 id=118 data-nosnippet>118</a> | <span class="macro">T!</span>[<=] |
| <a href=#119 id=119 data-nosnippet>119</a> | <span class="macro">T!</span>[==] |
| <a href=#120 id=120 data-nosnippet>120</a> | <span class="macro">T!</span>[=>] |
| <a href=#121 id=121 data-nosnippet>121</a> | <span class="macro">T!</span>[>=] |
| <a href=#122 id=122 data-nosnippet>122</a> | <span class="macro">T!</span>[>>] |
| <a href=#123 id=123 data-nosnippet>123</a> | <span class="macro">T!</span>[|=] |
| <a href=#124 id=124 data-nosnippet>124</a> | <span class="macro">T!</span>[||] => <span class="number">2</span>, |
| <a href=#125 id=125 data-nosnippet>125</a> |
| <a href=#126 id=126 data-nosnippet>126</a> <span class="macro">T!</span>[...] | <span class="macro">T!</span>[..=] | <span class="macro">T!</span>[<<=] | <span class="macro">T!</span>[>>=] => <span class="number">3</span>, |
| <a href=#127 id=127 data-nosnippet>127</a> <span class="kw">_ </span>=> <span class="number">1</span>, |
| <a href=#128 id=128 data-nosnippet>128</a> }; |
| <a href=#129 id=129 data-nosnippet>129</a> <span class="self">self</span>.do_bump(kind, n_raw_tokens); |
| <a href=#130 id=130 data-nosnippet>130</a> <span class="bool-val">true |
| <a href=#131 id=131 data-nosnippet>131</a> </span>} |
| <a href=#132 id=132 data-nosnippet>132</a> |
| <a href=#133 id=133 data-nosnippet>133</a> <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>eat_contextual_kw(<span class="kw-2">&mut </span><span class="self">self</span>, kind: SyntaxKind) -> bool { |
| <a href=#134 id=134 data-nosnippet>134</a> <span class="kw">if </span>!<span class="self">self</span>.at_contextual_kw(kind) { |
| <a href=#135 id=135 data-nosnippet>135</a> <span class="kw">return </span><span class="bool-val">false</span>; |
| <a href=#136 id=136 data-nosnippet>136</a> } |
| <a href=#137 id=137 data-nosnippet>137</a> <span class="self">self</span>.bump_remap(kind); |
| <a href=#138 id=138 data-nosnippet>138</a> <span class="bool-val">true |
| <a href=#139 id=139 data-nosnippet>139</a> </span>} |
| <a href=#140 id=140 data-nosnippet>140</a> |
| <a href=#141 id=141 data-nosnippet>141</a> <span class="kw">fn </span>at_composite2(<span class="kw-2">&</span><span class="self">self</span>, n: usize, k1: SyntaxKind, k2: SyntaxKind) -> bool { |
| <a href=#142 id=142 data-nosnippet>142</a> <span class="self">self</span>.inp.kind(<span class="self">self</span>.pos + n) == k1 |
| <a href=#143 id=143 data-nosnippet>143</a> && <span class="self">self</span>.inp.kind(<span class="self">self</span>.pos + n + <span class="number">1</span>) == k2 |
| <a href=#144 id=144 data-nosnippet>144</a> && <span class="self">self</span>.inp.is_joint(<span class="self">self</span>.pos + n) |
| <a href=#145 id=145 data-nosnippet>145</a> } |
| <a href=#146 id=146 data-nosnippet>146</a> |
| <a href=#147 id=147 data-nosnippet>147</a> <span class="kw">fn </span>at_composite3(<span class="kw-2">&</span><span class="self">self</span>, n: usize, k1: SyntaxKind, k2: SyntaxKind, k3: SyntaxKind) -> bool { |
| <a href=#148 id=148 data-nosnippet>148</a> <span class="self">self</span>.inp.kind(<span class="self">self</span>.pos + n) == k1 |
| <a href=#149 id=149 data-nosnippet>149</a> && <span class="self">self</span>.inp.kind(<span class="self">self</span>.pos + n + <span class="number">1</span>) == k2 |
| <a href=#150 id=150 data-nosnippet>150</a> && <span class="self">self</span>.inp.kind(<span class="self">self</span>.pos + n + <span class="number">2</span>) == k3 |
| <a href=#151 id=151 data-nosnippet>151</a> && <span class="self">self</span>.inp.is_joint(<span class="self">self</span>.pos + n) |
| <a href=#152 id=152 data-nosnippet>152</a> && <span class="self">self</span>.inp.is_joint(<span class="self">self</span>.pos + n + <span class="number">1</span>) |
| <a href=#153 id=153 data-nosnippet>153</a> } |
| <a href=#154 id=154 data-nosnippet>154</a> |
| <a href=#155 id=155 data-nosnippet>155</a> <span class="doccomment">/// Checks if the current token is in `kinds`. |
| <a href=#156 id=156 data-nosnippet>156</a> </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>at_ts(<span class="kw-2">&</span><span class="self">self</span>, kinds: TokenSet) -> bool { |
| <a href=#157 id=157 data-nosnippet>157</a> kinds.contains(<span class="self">self</span>.current()) |
| <a href=#158 id=158 data-nosnippet>158</a> } |
| <a href=#159 id=159 data-nosnippet>159</a> |
| <a href=#160 id=160 data-nosnippet>160</a> <span class="doccomment">/// Checks if the current token is contextual keyword `kw`. |
| <a href=#161 id=161 data-nosnippet>161</a> </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>at_contextual_kw(<span class="kw-2">&</span><span class="self">self</span>, kw: SyntaxKind) -> bool { |
| <a href=#162 id=162 data-nosnippet>162</a> <span class="self">self</span>.inp.contextual_kind(<span class="self">self</span>.pos) == kw |
| <a href=#163 id=163 data-nosnippet>163</a> } |
| <a href=#164 id=164 data-nosnippet>164</a> |
| <a href=#165 id=165 data-nosnippet>165</a> <span class="doccomment">/// Checks if the nth token is contextual keyword `kw`. |
| <a href=#166 id=166 data-nosnippet>166</a> </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>nth_at_contextual_kw(<span class="kw-2">&</span><span class="self">self</span>, n: usize, kw: SyntaxKind) -> bool { |
| <a href=#167 id=167 data-nosnippet>167</a> <span class="self">self</span>.inp.contextual_kind(<span class="self">self</span>.pos + n) == kw |
| <a href=#168 id=168 data-nosnippet>168</a> } |
| <a href=#169 id=169 data-nosnippet>169</a> |
| <a href=#170 id=170 data-nosnippet>170</a> <span class="doccomment">/// Starts a new node in the syntax tree. All nodes and tokens |
| <a href=#171 id=171 data-nosnippet>171</a> /// consumed between the `start` and the corresponding `Marker::complete` |
| <a href=#172 id=172 data-nosnippet>172</a> /// belong to the same node. |
| <a href=#173 id=173 data-nosnippet>173</a> </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>start(<span class="kw-2">&mut </span><span class="self">self</span>) -> Marker { |
| <a href=#174 id=174 data-nosnippet>174</a> <span class="kw">let </span>pos = <span class="self">self</span>.events.len() <span class="kw">as </span>u32; |
| <a href=#175 id=175 data-nosnippet>175</a> <span class="self">self</span>.push_event(Event::tombstone()); |
| <a href=#176 id=176 data-nosnippet>176</a> Marker::new(pos) |
| <a href=#177 id=177 data-nosnippet>177</a> } |
| <a href=#178 id=178 data-nosnippet>178</a> |
| <a href=#179 id=179 data-nosnippet>179</a> <span class="doccomment">/// Consume the next token. Panics if the parser isn't currently at `kind`. |
| <a href=#180 id=180 data-nosnippet>180</a> </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>bump(<span class="kw-2">&mut </span><span class="self">self</span>, kind: SyntaxKind) { |
| <a href=#181 id=181 data-nosnippet>181</a> <span class="macro">assert!</span>(<span class="self">self</span>.eat(kind)); |
| <a href=#182 id=182 data-nosnippet>182</a> } |
| <a href=#183 id=183 data-nosnippet>183</a> |
| <a href=#184 id=184 data-nosnippet>184</a> <span class="doccomment">/// Advances the parser by one token |
| <a href=#185 id=185 data-nosnippet>185</a> </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>bump_any(<span class="kw-2">&mut </span><span class="self">self</span>) { |
| <a href=#186 id=186 data-nosnippet>186</a> <span class="kw">let </span>kind = <span class="self">self</span>.nth(<span class="number">0</span>); |
| <a href=#187 id=187 data-nosnippet>187</a> <span class="kw">if </span>kind == EOF { |
| <a href=#188 id=188 data-nosnippet>188</a> <span class="kw">return</span>; |
| <a href=#189 id=189 data-nosnippet>189</a> } |
| <a href=#190 id=190 data-nosnippet>190</a> <span class="self">self</span>.do_bump(kind, <span class="number">1</span>); |
| <a href=#191 id=191 data-nosnippet>191</a> } |
| <a href=#192 id=192 data-nosnippet>192</a> |
| <a href=#193 id=193 data-nosnippet>193</a> <span class="doccomment">/// Advances the parser by one token |
| <a href=#194 id=194 data-nosnippet>194</a> </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>split_float(<span class="kw-2">&mut </span><span class="self">self</span>, <span class="kw-2">mut </span>marker: Marker) -> (bool, Marker) { |
| <a href=#195 id=195 data-nosnippet>195</a> <span class="macro">assert!</span>(<span class="self">self</span>.at(SyntaxKind::FLOAT_NUMBER)); |
| <a href=#196 id=196 data-nosnippet>196</a> <span class="comment">// we have parse `<something>.` |
| <a href=#197 id=197 data-nosnippet>197</a> // `<something>`.0.1 |
| <a href=#198 id=198 data-nosnippet>198</a> // here we need to insert an extra event |
| <a href=#199 id=199 data-nosnippet>199</a> // |
| <a href=#200 id=200 data-nosnippet>200</a> // `<something>`. 0. 1; |
| <a href=#201 id=201 data-nosnippet>201</a> // here we need to change the follow up parse, the return value will cause us to emulate a dot |
| <a href=#202 id=202 data-nosnippet>202</a> // the actual splitting happens later |
| <a href=#203 id=203 data-nosnippet>203</a> </span><span class="kw">let </span>ends_in_dot = !<span class="self">self</span>.inp.is_joint(<span class="self">self</span>.pos); |
| <a href=#204 id=204 data-nosnippet>204</a> <span class="kw">if </span>!ends_in_dot { |
| <a href=#205 id=205 data-nosnippet>205</a> <span class="kw">let </span>new_marker = <span class="self">self</span>.start(); |
| <a href=#206 id=206 data-nosnippet>206</a> <span class="kw">let </span>idx = marker.pos <span class="kw">as </span>usize; |
| <a href=#207 id=207 data-nosnippet>207</a> <span class="kw">match </span><span class="kw-2">&mut </span><span class="self">self</span>.events[idx] { |
| <a href=#208 id=208 data-nosnippet>208</a> Event::Start { forward_parent, kind } => { |
| <a href=#209 id=209 data-nosnippet>209</a> <span class="kw-2">*</span>kind = SyntaxKind::FIELD_EXPR; |
| <a href=#210 id=210 data-nosnippet>210</a> <span class="kw-2">*</span>forward_parent = <span class="prelude-val">Some</span>(new_marker.pos - marker.pos); |
| <a href=#211 id=211 data-nosnippet>211</a> } |
| <a href=#212 id=212 data-nosnippet>212</a> <span class="kw">_ </span>=> <span class="macro">unreachable!</span>(), |
| <a href=#213 id=213 data-nosnippet>213</a> } |
| <a href=#214 id=214 data-nosnippet>214</a> marker.bomb.defuse(); |
| <a href=#215 id=215 data-nosnippet>215</a> marker = new_marker; |
| <a href=#216 id=216 data-nosnippet>216</a> }; |
| <a href=#217 id=217 data-nosnippet>217</a> <span class="self">self</span>.pos += <span class="number">1</span>; |
| <a href=#218 id=218 data-nosnippet>218</a> <span class="self">self</span>.push_event(Event::FloatSplitHack { ends_in_dot }); |
| <a href=#219 id=219 data-nosnippet>219</a> (ends_in_dot, marker) |
| <a href=#220 id=220 data-nosnippet>220</a> } |
| <a href=#221 id=221 data-nosnippet>221</a> |
| <a href=#222 id=222 data-nosnippet>222</a> <span class="doccomment">/// Advances the parser by one token, remapping its kind. |
| <a href=#223 id=223 data-nosnippet>223</a> /// This is useful to create contextual keywords from |
| <a href=#224 id=224 data-nosnippet>224</a> /// identifiers. For example, the lexer creates a `union` |
| <a href=#225 id=225 data-nosnippet>225</a> /// *identifier* token, but the parser remaps it to the |
| <a href=#226 id=226 data-nosnippet>226</a> /// `union` keyword, and keyword is what ends up in the |
| <a href=#227 id=227 data-nosnippet>227</a> /// final tree. |
| <a href=#228 id=228 data-nosnippet>228</a> </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>bump_remap(<span class="kw-2">&mut </span><span class="self">self</span>, kind: SyntaxKind) { |
| <a href=#229 id=229 data-nosnippet>229</a> <span class="kw">if </span><span class="self">self</span>.nth(<span class="number">0</span>) == EOF { |
| <a href=#230 id=230 data-nosnippet>230</a> <span class="comment">// FIXME: panic!? |
| <a href=#231 id=231 data-nosnippet>231</a> </span><span class="kw">return</span>; |
| <a href=#232 id=232 data-nosnippet>232</a> } |
| <a href=#233 id=233 data-nosnippet>233</a> <span class="self">self</span>.do_bump(kind, <span class="number">1</span>); |
| <a href=#234 id=234 data-nosnippet>234</a> } |
| <a href=#235 id=235 data-nosnippet>235</a> |
| <a href=#236 id=236 data-nosnippet>236</a> <span class="doccomment">/// Emit error with the `message` |
| <a href=#237 id=237 data-nosnippet>237</a> /// FIXME: this should be much more fancy and support |
| <a href=#238 id=238 data-nosnippet>238</a> /// structured errors with spans and notes, like rustc |
| <a href=#239 id=239 data-nosnippet>239</a> /// does. |
| <a href=#240 id=240 data-nosnippet>240</a> </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>error<T: Into<String>>(<span class="kw-2">&mut </span><span class="self">self</span>, message: T) { |
| <a href=#241 id=241 data-nosnippet>241</a> <span class="kw">let </span>msg = message.into(); |
| <a href=#242 id=242 data-nosnippet>242</a> <span class="self">self</span>.push_event(Event::Error { msg }); |
| <a href=#243 id=243 data-nosnippet>243</a> } |
| <a href=#244 id=244 data-nosnippet>244</a> |
| <a href=#245 id=245 data-nosnippet>245</a> <span class="doccomment">/// Consume the next token if it is `kind` or emit an error |
| <a href=#246 id=246 data-nosnippet>246</a> /// otherwise. |
| <a href=#247 id=247 data-nosnippet>247</a> </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>expect(<span class="kw-2">&mut </span><span class="self">self</span>, kind: SyntaxKind) -> bool { |
| <a href=#248 id=248 data-nosnippet>248</a> <span class="kw">if </span><span class="self">self</span>.eat(kind) { |
| <a href=#249 id=249 data-nosnippet>249</a> <span class="kw">return </span><span class="bool-val">true</span>; |
| <a href=#250 id=250 data-nosnippet>250</a> } |
| <a href=#251 id=251 data-nosnippet>251</a> <span class="self">self</span>.error(<span class="macro">format!</span>(<span class="string">"expected {kind:?}"</span>)); |
| <a href=#252 id=252 data-nosnippet>252</a> <span class="bool-val">false |
| <a href=#253 id=253 data-nosnippet>253</a> </span>} |
| <a href=#254 id=254 data-nosnippet>254</a> |
| <a href=#255 id=255 data-nosnippet>255</a> <span class="doccomment">/// Create an error node and consume the next token. |
| <a href=#256 id=256 data-nosnippet>256</a> </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>err_and_bump(<span class="kw-2">&mut </span><span class="self">self</span>, message: <span class="kw-2">&</span>str) { |
| <a href=#257 id=257 data-nosnippet>257</a> <span class="kw">let </span>m = <span class="self">self</span>.start(); |
| <a href=#258 id=258 data-nosnippet>258</a> <span class="self">self</span>.error(message); |
| <a href=#259 id=259 data-nosnippet>259</a> <span class="self">self</span>.bump_any(); |
| <a href=#260 id=260 data-nosnippet>260</a> m.complete(<span class="self">self</span>, ERROR); |
| <a href=#261 id=261 data-nosnippet>261</a> } |
| <a href=#262 id=262 data-nosnippet>262</a> |
| <a href=#263 id=263 data-nosnippet>263</a> <span class="doccomment">/// Create an error node and consume the next token unless it is in the recovery set. |
| <a href=#264 id=264 data-nosnippet>264</a> /// |
| <a href=#265 id=265 data-nosnippet>265</a> /// Returns true if recovery kicked in. |
| <a href=#266 id=266 data-nosnippet>266</a> </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>err_recover(<span class="kw-2">&mut </span><span class="self">self</span>, message: <span class="kw-2">&</span>str, recovery: TokenSet) -> bool { |
| <a href=#267 id=267 data-nosnippet>267</a> <span class="kw">if </span><span class="macro">matches!</span>(<span class="self">self</span>.current(), <span class="macro">T!</span>[<span class="string">'{'</span>] | <span class="macro">T!</span>[<span class="string">'}'</span>]) { |
| <a href=#268 id=268 data-nosnippet>268</a> <span class="self">self</span>.error(message); |
| <a href=#269 id=269 data-nosnippet>269</a> <span class="kw">return </span><span class="bool-val">true</span>; |
| <a href=#270 id=270 data-nosnippet>270</a> } |
| <a href=#271 id=271 data-nosnippet>271</a> |
| <a href=#272 id=272 data-nosnippet>272</a> <span class="kw">if </span><span class="self">self</span>.at_ts(recovery) { |
| <a href=#273 id=273 data-nosnippet>273</a> <span class="self">self</span>.error(message); |
| <a href=#274 id=274 data-nosnippet>274</a> <span class="kw">return </span><span class="bool-val">true</span>; |
| <a href=#275 id=275 data-nosnippet>275</a> } |
| <a href=#276 id=276 data-nosnippet>276</a> |
| <a href=#277 id=277 data-nosnippet>277</a> <span class="kw">let </span>m = <span class="self">self</span>.start(); |
| <a href=#278 id=278 data-nosnippet>278</a> <span class="self">self</span>.error(message); |
| <a href=#279 id=279 data-nosnippet>279</a> <span class="self">self</span>.bump_any(); |
| <a href=#280 id=280 data-nosnippet>280</a> m.complete(<span class="self">self</span>, ERROR); |
| <a href=#281 id=281 data-nosnippet>281</a> <span class="bool-val">false |
| <a href=#282 id=282 data-nosnippet>282</a> </span>} |
| <a href=#283 id=283 data-nosnippet>283</a> |
| <a href=#284 id=284 data-nosnippet>284</a> <span class="kw">fn </span>do_bump(<span class="kw-2">&mut </span><span class="self">self</span>, kind: SyntaxKind, n_raw_tokens: u8) { |
| <a href=#285 id=285 data-nosnippet>285</a> <span class="self">self</span>.pos += n_raw_tokens <span class="kw">as </span>usize; |
| <a href=#286 id=286 data-nosnippet>286</a> <span class="self">self</span>.steps.set(<span class="number">0</span>); |
| <a href=#287 id=287 data-nosnippet>287</a> <span class="self">self</span>.push_event(Event::Token { kind, n_raw_tokens }); |
| <a href=#288 id=288 data-nosnippet>288</a> } |
| <a href=#289 id=289 data-nosnippet>289</a> |
| <a href=#290 id=290 data-nosnippet>290</a> <span class="kw">fn </span>push_event(<span class="kw-2">&mut </span><span class="self">self</span>, event: Event) { |
| <a href=#291 id=291 data-nosnippet>291</a> <span class="self">self</span>.events.push(event); |
| <a href=#292 id=292 data-nosnippet>292</a> } |
| <a href=#293 id=293 data-nosnippet>293</a> |
| <a href=#294 id=294 data-nosnippet>294</a> <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>edition(<span class="kw-2">&</span><span class="self">self</span>) -> Edition { |
| <a href=#295 id=295 data-nosnippet>295</a> <span class="self">self</span>.edition |
| <a href=#296 id=296 data-nosnippet>296</a> } |
| <a href=#297 id=297 data-nosnippet>297</a>} |
| <a href=#298 id=298 data-nosnippet>298</a> |
| <a href=#299 id=299 data-nosnippet>299</a><span class="doccomment">/// See [`Parser::start`]. |
| <a href=#300 id=300 data-nosnippet>300</a></span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">struct </span>Marker { |
| <a href=#301 id=301 data-nosnippet>301</a> pos: u32, |
| <a href=#302 id=302 data-nosnippet>302</a> bomb: DropBomb, |
| <a href=#303 id=303 data-nosnippet>303</a>} |
| <a href=#304 id=304 data-nosnippet>304</a> |
| <a href=#305 id=305 data-nosnippet>305</a><span class="kw">impl </span>Marker { |
| <a href=#306 id=306 data-nosnippet>306</a> <span class="kw">fn </span>new(pos: u32) -> Marker { |
| <a href=#307 id=307 data-nosnippet>307</a> Marker { pos, bomb: DropBomb::new(<span class="string">"Marker must be either completed or abandoned"</span>) } |
| <a href=#308 id=308 data-nosnippet>308</a> } |
| <a href=#309 id=309 data-nosnippet>309</a> |
| <a href=#310 id=310 data-nosnippet>310</a> <span class="doccomment">/// Finishes the syntax tree node and assigns `kind` to it, |
| <a href=#311 id=311 data-nosnippet>311</a> /// and mark the create a `CompletedMarker` for possible future |
| <a href=#312 id=312 data-nosnippet>312</a> /// operation like `.precede()` to deal with forward_parent. |
| <a href=#313 id=313 data-nosnippet>313</a> </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>complete(<span class="kw-2">mut </span><span class="self">self</span>, p: <span class="kw-2">&mut </span>Parser<<span class="lifetime">'_</span>>, kind: SyntaxKind) -> CompletedMarker { |
| <a href=#314 id=314 data-nosnippet>314</a> <span class="self">self</span>.bomb.defuse(); |
| <a href=#315 id=315 data-nosnippet>315</a> <span class="kw">let </span>idx = <span class="self">self</span>.pos <span class="kw">as </span>usize; |
| <a href=#316 id=316 data-nosnippet>316</a> <span class="kw">match </span><span class="kw-2">&mut </span>p.events[idx] { |
| <a href=#317 id=317 data-nosnippet>317</a> Event::Start { kind: slot, .. } => { |
| <a href=#318 id=318 data-nosnippet>318</a> <span class="kw-2">*</span>slot = kind; |
| <a href=#319 id=319 data-nosnippet>319</a> } |
| <a href=#320 id=320 data-nosnippet>320</a> <span class="kw">_ </span>=> <span class="macro">unreachable!</span>(), |
| <a href=#321 id=321 data-nosnippet>321</a> } |
| <a href=#322 id=322 data-nosnippet>322</a> p.push_event(Event::Finish); |
| <a href=#323 id=323 data-nosnippet>323</a> <span class="kw">let </span>end_pos = p.events.len() <span class="kw">as </span>u32; |
| <a href=#324 id=324 data-nosnippet>324</a> CompletedMarker::new(<span class="self">self</span>.pos, end_pos, kind) |
| <a href=#325 id=325 data-nosnippet>325</a> } |
| <a href=#326 id=326 data-nosnippet>326</a> |
| <a href=#327 id=327 data-nosnippet>327</a> <span class="doccomment">/// Abandons the syntax tree node. All its children |
| <a href=#328 id=328 data-nosnippet>328</a> /// are attached to its parent instead. |
| <a href=#329 id=329 data-nosnippet>329</a> </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>abandon(<span class="kw-2">mut </span><span class="self">self</span>, p: <span class="kw-2">&mut </span>Parser<<span class="lifetime">'_</span>>) { |
| <a href=#330 id=330 data-nosnippet>330</a> <span class="self">self</span>.bomb.defuse(); |
| <a href=#331 id=331 data-nosnippet>331</a> <span class="kw">let </span>idx = <span class="self">self</span>.pos <span class="kw">as </span>usize; |
| <a href=#332 id=332 data-nosnippet>332</a> <span class="kw">if </span>idx == p.events.len() - <span class="number">1 </span>{ |
| <a href=#333 id=333 data-nosnippet>333</a> <span class="macro">assert!</span>(<span class="macro">matches!</span>( |
| <a href=#334 id=334 data-nosnippet>334</a> p.events.pop(), |
| <a href=#335 id=335 data-nosnippet>335</a> <span class="prelude-val">Some</span>(Event::Start { kind: TOMBSTONE, forward_parent: <span class="prelude-val">None </span>}) |
| <a href=#336 id=336 data-nosnippet>336</a> )); |
| <a href=#337 id=337 data-nosnippet>337</a> } |
| <a href=#338 id=338 data-nosnippet>338</a> } |
| <a href=#339 id=339 data-nosnippet>339</a>} |
| <a href=#340 id=340 data-nosnippet>340</a> |
| <a href=#341 id=341 data-nosnippet>341</a><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">struct </span>CompletedMarker { |
| <a href=#342 id=342 data-nosnippet>342</a> start_pos: u32, |
| <a href=#343 id=343 data-nosnippet>343</a> end_pos: u32, |
| <a href=#344 id=344 data-nosnippet>344</a> kind: SyntaxKind, |
| <a href=#345 id=345 data-nosnippet>345</a>} |
| <a href=#346 id=346 data-nosnippet>346</a> |
| <a href=#347 id=347 data-nosnippet>347</a><span class="kw">impl </span>CompletedMarker { |
| <a href=#348 id=348 data-nosnippet>348</a> <span class="kw">fn </span>new(start_pos: u32, end_pos: u32, kind: SyntaxKind) -> <span class="self">Self </span>{ |
| <a href=#349 id=349 data-nosnippet>349</a> CompletedMarker { start_pos, end_pos, kind } |
| <a href=#350 id=350 data-nosnippet>350</a> } |
| <a href=#351 id=351 data-nosnippet>351</a> |
| <a href=#352 id=352 data-nosnippet>352</a> <span class="doccomment">/// This method allows to create a new node which starts |
| <a href=#353 id=353 data-nosnippet>353</a> /// *before* the current one. That is, parser could start |
| <a href=#354 id=354 data-nosnippet>354</a> /// node `A`, then complete it, and then after parsing the |
| <a href=#355 id=355 data-nosnippet>355</a> /// whole `A`, decide that it should have started some node |
| <a href=#356 id=356 data-nosnippet>356</a> /// `B` before starting `A`. `precede` allows to do exactly |
| <a href=#357 id=357 data-nosnippet>357</a> /// that. See also docs about |
| <a href=#358 id=358 data-nosnippet>358</a> /// [`Event::Start::forward_parent`](crate::event::Event::Start::forward_parent). |
| <a href=#359 id=359 data-nosnippet>359</a> /// |
| <a href=#360 id=360 data-nosnippet>360</a> /// Given completed events `[START, FINISH]` and its corresponding |
| <a href=#361 id=361 data-nosnippet>361</a> /// `CompletedMarker(pos: 0, _)`. |
| <a href=#362 id=362 data-nosnippet>362</a> /// Append a new `START` events as `[START, FINISH, NEWSTART]`, |
| <a href=#363 id=363 data-nosnippet>363</a> /// then mark `NEWSTART` as `START`'s parent with saving its relative |
| <a href=#364 id=364 data-nosnippet>364</a> /// distance to `NEWSTART` into forward_parent(=2 in this case); |
| <a href=#365 id=365 data-nosnippet>365</a> </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>precede(<span class="self">self</span>, p: <span class="kw-2">&mut </span>Parser<<span class="lifetime">'_</span>>) -> Marker { |
| <a href=#366 id=366 data-nosnippet>366</a> <span class="kw">let </span>new_pos = p.start(); |
| <a href=#367 id=367 data-nosnippet>367</a> <span class="kw">let </span>idx = <span class="self">self</span>.start_pos <span class="kw">as </span>usize; |
| <a href=#368 id=368 data-nosnippet>368</a> <span class="kw">match </span><span class="kw-2">&mut </span>p.events[idx] { |
| <a href=#369 id=369 data-nosnippet>369</a> Event::Start { forward_parent, .. } => { |
| <a href=#370 id=370 data-nosnippet>370</a> <span class="kw-2">*</span>forward_parent = <span class="prelude-val">Some</span>(new_pos.pos - <span class="self">self</span>.start_pos); |
| <a href=#371 id=371 data-nosnippet>371</a> } |
| <a href=#372 id=372 data-nosnippet>372</a> <span class="kw">_ </span>=> <span class="macro">unreachable!</span>(), |
| <a href=#373 id=373 data-nosnippet>373</a> } |
| <a href=#374 id=374 data-nosnippet>374</a> new_pos |
| <a href=#375 id=375 data-nosnippet>375</a> } |
| <a href=#376 id=376 data-nosnippet>376</a> |
| <a href=#377 id=377 data-nosnippet>377</a> <span class="doccomment">/// Extends this completed marker *to the left* up to `m`. |
| <a href=#378 id=378 data-nosnippet>378</a> </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>extend_to(<span class="self">self</span>, p: <span class="kw-2">&mut </span>Parser<<span class="lifetime">'_</span>>, <span class="kw-2">mut </span>m: Marker) -> CompletedMarker { |
| <a href=#379 id=379 data-nosnippet>379</a> m.bomb.defuse(); |
| <a href=#380 id=380 data-nosnippet>380</a> <span class="kw">let </span>idx = m.pos <span class="kw">as </span>usize; |
| <a href=#381 id=381 data-nosnippet>381</a> <span class="kw">match </span><span class="kw-2">&mut </span>p.events[idx] { |
| <a href=#382 id=382 data-nosnippet>382</a> Event::Start { forward_parent, .. } => { |
| <a href=#383 id=383 data-nosnippet>383</a> <span class="kw-2">*</span>forward_parent = <span class="prelude-val">Some</span>(<span class="self">self</span>.start_pos - m.pos); |
| <a href=#384 id=384 data-nosnippet>384</a> } |
| <a href=#385 id=385 data-nosnippet>385</a> <span class="kw">_ </span>=> <span class="macro">unreachable!</span>(), |
| <a href=#386 id=386 data-nosnippet>386</a> } |
| <a href=#387 id=387 data-nosnippet>387</a> <span class="self">self |
| <a href=#388 id=388 data-nosnippet>388</a> </span>} |
| <a href=#389 id=389 data-nosnippet>389</a> |
| <a href=#390 id=390 data-nosnippet>390</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>) -> SyntaxKind { |
| <a href=#391 id=391 data-nosnippet>391</a> <span class="self">self</span>.kind |
| <a href=#392 id=392 data-nosnippet>392</a> } |
| <a href=#393 id=393 data-nosnippet>393</a> |
| <a href=#394 id=394 data-nosnippet>394</a> <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>last_token(<span class="kw-2">&</span><span class="self">self</span>, p: <span class="kw-2">&</span>Parser<<span class="lifetime">'_</span>>) -> <span class="prelude-ty">Option</span><SyntaxKind> { |
| <a href=#395 id=395 data-nosnippet>395</a> <span class="kw">let </span>end_pos = <span class="self">self</span>.end_pos <span class="kw">as </span>usize; |
| <a href=#396 id=396 data-nosnippet>396</a> <span class="macro">debug_assert_eq!</span>(p.events[end_pos - <span class="number">1</span>], Event::Finish); |
| <a href=#397 id=397 data-nosnippet>397</a> p.events[..end_pos].iter().rev().find_map(|event| <span class="kw">match </span>event { |
| <a href=#398 id=398 data-nosnippet>398</a> Event::Token { kind, .. } => <span class="prelude-val">Some</span>(<span class="kw-2">*</span>kind), |
| <a href=#399 id=399 data-nosnippet>399</a> <span class="kw">_ </span>=> <span class="prelude-val">None</span>, |
| <a href=#400 id=400 data-nosnippet>400</a> }) |
| <a href=#401 id=401 data-nosnippet>401</a> } |
| <a href=#402 id=402 data-nosnippet>402</a>}</code></pre></div></section></main></body></html> |
