| <!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/ide-db/src/syntax_helpers/node_ext.rs`."><title>node_ext.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-ca0dd0c4.css"><meta name="rustdoc-vars" data-root-path="../../../" data-static-root-path="../../../static.files/" data-current-crate="ide_db" data-themes="" data-resource-suffix="" data-rustdoc-version="1.92.0 (ded5c06cf 2025-12-08)" data-channel="1.92.0" data-search-js="search-d69d8955.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-ce535bd0.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">ide_db/syntax_helpers/</div>node_ext.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">//! Various helper functions to work with SyntaxNodes. |
| <a href=#2 id=2 data-nosnippet>2</a></span><span class="kw">use </span>std::ops::ControlFlow; |
| <a href=#3 id=3 data-nosnippet>3</a> |
| <a href=#4 id=4 data-nosnippet>4</a><span class="kw">use </span>itertools::Itertools; |
| <a href=#5 id=5 data-nosnippet>5</a><span class="kw">use </span>parser::T; |
| <a href=#6 id=6 data-nosnippet>6</a><span class="kw">use </span>span::Edition; |
| <a href=#7 id=7 data-nosnippet>7</a><span class="kw">use </span>syntax::{ |
| <a href=#8 id=8 data-nosnippet>8</a> AstNode, AstToken, Preorder, RustLanguage, WalkEvent, |
| <a href=#9 id=9 data-nosnippet>9</a> ast::{<span class="self">self</span>, HasLoopBody, MacroCall, PathSegmentKind, VisibilityKind}, |
| <a href=#10 id=10 data-nosnippet>10</a>}; |
| <a href=#11 id=11 data-nosnippet>11</a> |
| <a href=#12 id=12 data-nosnippet>12</a><span class="kw">pub fn </span>expr_as_name_ref(expr: <span class="kw-2">&</span>ast::Expr) -> <span class="prelude-ty">Option</span><ast::NameRef> { |
| <a href=#13 id=13 data-nosnippet>13</a> <span class="kw">if let </span>ast::Expr::PathExpr(expr) = expr { |
| <a href=#14 id=14 data-nosnippet>14</a> <span class="kw">let </span>path = expr.path()<span class="question-mark">?</span>; |
| <a href=#15 id=15 data-nosnippet>15</a> path.as_single_name_ref() |
| <a href=#16 id=16 data-nosnippet>16</a> } <span class="kw">else </span>{ |
| <a href=#17 id=17 data-nosnippet>17</a> <span class="prelude-val">None |
| <a href=#18 id=18 data-nosnippet>18</a> </span>} |
| <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="kw">pub fn </span>full_path_of_name_ref(name_ref: <span class="kw-2">&</span>ast::NameRef) -> <span class="prelude-ty">Option</span><ast::Path> { |
| <a href=#22 id=22 data-nosnippet>22</a> <span class="kw">let </span><span class="kw-2">mut </span>ancestors = name_ref.syntax().ancestors(); |
| <a href=#23 id=23 data-nosnippet>23</a> <span class="kw">let _ </span>= ancestors.next()<span class="question-mark">?</span>; <span class="comment">// skip self |
| <a href=#24 id=24 data-nosnippet>24</a> </span><span class="kw">let _ </span>= ancestors.next().filter(|it| ast::PathSegment::can_cast(it.kind()))<span class="question-mark">?</span>; <span class="comment">// skip self |
| <a href=#25 id=25 data-nosnippet>25</a> </span>ancestors.take_while(|it| ast::Path::can_cast(it.kind())).last().and_then(ast::Path::cast) |
| <a href=#26 id=26 data-nosnippet>26</a>} |
| <a href=#27 id=27 data-nosnippet>27</a> |
| <a href=#28 id=28 data-nosnippet>28</a><span class="kw">pub fn </span>block_as_lone_tail(block: <span class="kw-2">&</span>ast::BlockExpr) -> <span class="prelude-ty">Option</span><ast::Expr> { |
| <a href=#29 id=29 data-nosnippet>29</a> block.statements().next().is_none().then(|| block.tail_expr()).flatten() |
| <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="doccomment">/// Preorder walk all the expression's child expressions. |
| <a href=#33 id=33 data-nosnippet>33</a></span><span class="kw">pub fn </span>walk_expr(expr: <span class="kw-2">&</span>ast::Expr, cb: <span class="kw-2">&mut </span><span class="kw">dyn </span>FnMut(ast::Expr)) { |
| <a href=#34 id=34 data-nosnippet>34</a> preorder_expr(expr, <span class="kw-2">&mut </span>|ev| { |
| <a href=#35 id=35 data-nosnippet>35</a> <span class="kw">if let </span>WalkEvent::Enter(expr) = ev { |
| <a href=#36 id=36 data-nosnippet>36</a> cb(expr); |
| <a href=#37 id=37 data-nosnippet>37</a> } |
| <a href=#38 id=38 data-nosnippet>38</a> <span class="bool-val">false |
| <a href=#39 id=39 data-nosnippet>39</a> </span>}) |
| <a href=#40 id=40 data-nosnippet>40</a>} |
| <a href=#41 id=41 data-nosnippet>41</a> |
| <a href=#42 id=42 data-nosnippet>42</a><span class="kw">pub fn </span>is_closure_or_blk_with_modif(expr: <span class="kw-2">&</span>ast::Expr) -> bool { |
| <a href=#43 id=43 data-nosnippet>43</a> <span class="kw">match </span>expr { |
| <a href=#44 id=44 data-nosnippet>44</a> ast::Expr::BlockExpr(block_expr) => { |
| <a href=#45 id=45 data-nosnippet>45</a> <span class="macro">matches!</span>( |
| <a href=#46 id=46 data-nosnippet>46</a> block_expr.modifier(), |
| <a href=#47 id=47 data-nosnippet>47</a> <span class="prelude-val">Some</span>( |
| <a href=#48 id=48 data-nosnippet>48</a> ast::BlockModifier::Async(<span class="kw">_</span>) |
| <a href=#49 id=49 data-nosnippet>49</a> | ast::BlockModifier::Try(<span class="kw">_</span>) |
| <a href=#50 id=50 data-nosnippet>50</a> | ast::BlockModifier::Const(<span class="kw">_</span>) |
| <a href=#51 id=51 data-nosnippet>51</a> ) |
| <a href=#52 id=52 data-nosnippet>52</a> ) |
| <a href=#53 id=53 data-nosnippet>53</a> } |
| <a href=#54 id=54 data-nosnippet>54</a> ast::Expr::ClosureExpr(<span class="kw">_</span>) => <span class="bool-val">true</span>, |
| <a href=#55 id=55 data-nosnippet>55</a> <span class="kw">_ </span>=> <span class="bool-val">false</span>, |
| <a href=#56 id=56 data-nosnippet>56</a> } |
| <a href=#57 id=57 data-nosnippet>57</a>} |
| <a href=#58 id=58 data-nosnippet>58</a> |
| <a href=#59 id=59 data-nosnippet>59</a><span class="doccomment">/// Preorder walk all the expression's child expressions preserving events. |
| <a href=#60 id=60 data-nosnippet>60</a>/// If the callback returns true on an [`WalkEvent::Enter`], the subtree of the expression will be skipped. |
| <a href=#61 id=61 data-nosnippet>61</a>/// Note that the subtree may already be skipped due to the context analysis this function does. |
| <a href=#62 id=62 data-nosnippet>62</a></span><span class="kw">pub fn </span>preorder_expr(start: <span class="kw-2">&</span>ast::Expr, cb: <span class="kw-2">&mut </span><span class="kw">dyn </span>FnMut(WalkEvent<ast::Expr>) -> bool) { |
| <a href=#63 id=63 data-nosnippet>63</a> preorder_expr_with_ctx_checker(start, <span class="kw-2">&</span>is_closure_or_blk_with_modif, cb); |
| <a href=#64 id=64 data-nosnippet>64</a>} |
| <a href=#65 id=65 data-nosnippet>65</a> |
| <a href=#66 id=66 data-nosnippet>66</a><span class="kw">pub fn </span>preorder_expr_with_ctx_checker( |
| <a href=#67 id=67 data-nosnippet>67</a> start: <span class="kw-2">&</span>ast::Expr, |
| <a href=#68 id=68 data-nosnippet>68</a> check_ctx: <span class="kw-2">&</span><span class="kw">dyn </span>Fn(<span class="kw-2">&</span>ast::Expr) -> bool, |
| <a href=#69 id=69 data-nosnippet>69</a> cb: <span class="kw-2">&mut </span><span class="kw">dyn </span>FnMut(WalkEvent<ast::Expr>) -> bool, |
| <a href=#70 id=70 data-nosnippet>70</a>) { |
| <a href=#71 id=71 data-nosnippet>71</a> <span class="kw">let </span><span class="kw-2">mut </span>preorder = start.syntax().preorder(); |
| <a href=#72 id=72 data-nosnippet>72</a> <span class="kw">while let </span><span class="prelude-val">Some</span>(event) = preorder.next() { |
| <a href=#73 id=73 data-nosnippet>73</a> <span class="kw">let </span>node = <span class="kw">match </span>event { |
| <a href=#74 id=74 data-nosnippet>74</a> WalkEvent::Enter(node) => node, |
| <a href=#75 id=75 data-nosnippet>75</a> WalkEvent::Leave(node) => { |
| <a href=#76 id=76 data-nosnippet>76</a> <span class="kw">if let </span><span class="prelude-val">Some</span>(expr) = ast::Expr::cast(node) { |
| <a href=#77 id=77 data-nosnippet>77</a> cb(WalkEvent::Leave(expr)); |
| <a href=#78 id=78 data-nosnippet>78</a> } |
| <a href=#79 id=79 data-nosnippet>79</a> <span class="kw">continue</span>; |
| <a href=#80 id=80 data-nosnippet>80</a> } |
| <a href=#81 id=81 data-nosnippet>81</a> }; |
| <a href=#82 id=82 data-nosnippet>82</a> <span class="kw">if let </span><span class="prelude-val">Some</span>(let_stmt) = node.parent().and_then(ast::LetStmt::cast) |
| <a href=#83 id=83 data-nosnippet>83</a> && let_stmt.initializer().map(|it| it.syntax() != <span class="kw-2">&</span>node).unwrap_or(<span class="bool-val">true</span>) |
| <a href=#84 id=84 data-nosnippet>84</a> && let_stmt.let_else().map(|it| it.syntax() != <span class="kw-2">&</span>node).unwrap_or(<span class="bool-val">true</span>) |
| <a href=#85 id=85 data-nosnippet>85</a> { |
| <a href=#86 id=86 data-nosnippet>86</a> <span class="comment">// skipping potential const pat expressions in let statements |
| <a href=#87 id=87 data-nosnippet>87</a> </span>preorder.skip_subtree(); |
| <a href=#88 id=88 data-nosnippet>88</a> <span class="kw">continue</span>; |
| <a href=#89 id=89 data-nosnippet>89</a> } |
| <a href=#90 id=90 data-nosnippet>90</a> |
| <a href=#91 id=91 data-nosnippet>91</a> <span class="kw">match </span>ast::Stmt::cast(node.clone()) { |
| <a href=#92 id=92 data-nosnippet>92</a> <span class="comment">// Don't skip subtree since we want to process the expression child next |
| <a href=#93 id=93 data-nosnippet>93</a> </span><span class="prelude-val">Some</span>(ast::Stmt::ExprStmt(<span class="kw">_</span>)) | <span class="prelude-val">Some</span>(ast::Stmt::LetStmt(<span class="kw">_</span>)) => (), |
| <a href=#94 id=94 data-nosnippet>94</a> <span class="comment">// skip inner items which might have their own expressions |
| <a href=#95 id=95 data-nosnippet>95</a> </span><span class="prelude-val">Some</span>(ast::Stmt::Item(<span class="kw">_</span>)) => preorder.skip_subtree(), |
| <a href=#96 id=96 data-nosnippet>96</a> <span class="prelude-val">None </span>=> { |
| <a href=#97 id=97 data-nosnippet>97</a> <span class="comment">// skip const args, those expressions are a different context |
| <a href=#98 id=98 data-nosnippet>98</a> </span><span class="kw">if </span>ast::GenericArg::can_cast(node.kind()) { |
| <a href=#99 id=99 data-nosnippet>99</a> preorder.skip_subtree(); |
| <a href=#100 id=100 data-nosnippet>100</a> } <span class="kw">else if let </span><span class="prelude-val">Some</span>(expr) = ast::Expr::cast(node) { |
| <a href=#101 id=101 data-nosnippet>101</a> <span class="kw">let </span>is_different_context = check_ctx(<span class="kw-2">&</span>expr) && expr.syntax() != start.syntax(); |
| <a href=#102 id=102 data-nosnippet>102</a> <span class="kw">let </span>skip = cb(WalkEvent::Enter(expr)); |
| <a href=#103 id=103 data-nosnippet>103</a> <span class="kw">if </span>skip || is_different_context { |
| <a href=#104 id=104 data-nosnippet>104</a> preorder.skip_subtree(); |
| <a href=#105 id=105 data-nosnippet>105</a> } |
| <a href=#106 id=106 data-nosnippet>106</a> } |
| <a href=#107 id=107 data-nosnippet>107</a> } |
| <a href=#108 id=108 data-nosnippet>108</a> } |
| <a href=#109 id=109 data-nosnippet>109</a> } |
| <a href=#110 id=110 data-nosnippet>110</a>} |
| <a href=#111 id=111 data-nosnippet>111</a> |
| <a href=#112 id=112 data-nosnippet>112</a><span class="doccomment">/// Preorder walk all the expression's child patterns. |
| <a href=#113 id=113 data-nosnippet>113</a></span><span class="kw">pub fn </span>walk_patterns_in_expr(start: <span class="kw-2">&</span>ast::Expr, cb: <span class="kw-2">&mut </span><span class="kw">dyn </span>FnMut(ast::Pat)) { |
| <a href=#114 id=114 data-nosnippet>114</a> <span class="kw">let </span><span class="kw-2">mut </span>preorder = start.syntax().preorder(); |
| <a href=#115 id=115 data-nosnippet>115</a> <span class="kw">while let </span><span class="prelude-val">Some</span>(event) = preorder.next() { |
| <a href=#116 id=116 data-nosnippet>116</a> <span class="kw">let </span>node = <span class="kw">match </span>event { |
| <a href=#117 id=117 data-nosnippet>117</a> WalkEvent::Enter(node) => node, |
| <a href=#118 id=118 data-nosnippet>118</a> WalkEvent::Leave(<span class="kw">_</span>) => <span class="kw">continue</span>, |
| <a href=#119 id=119 data-nosnippet>119</a> }; |
| <a href=#120 id=120 data-nosnippet>120</a> <span class="kw">match </span>ast::Stmt::cast(node.clone()) { |
| <a href=#121 id=121 data-nosnippet>121</a> <span class="prelude-val">Some</span>(ast::Stmt::LetStmt(l)) => { |
| <a href=#122 id=122 data-nosnippet>122</a> <span class="kw">if let </span><span class="prelude-val">Some</span>(pat) = l.pat() { |
| <a href=#123 id=123 data-nosnippet>123</a> <span class="kw">_ </span>= walk_pat(<span class="kw-2">&</span>pat, <span class="kw-2">&mut </span>|pat| { |
| <a href=#124 id=124 data-nosnippet>124</a> cb(pat); |
| <a href=#125 id=125 data-nosnippet>125</a> ControlFlow::<(), ()>::Continue(()) |
| <a href=#126 id=126 data-nosnippet>126</a> }); |
| <a href=#127 id=127 data-nosnippet>127</a> } |
| <a href=#128 id=128 data-nosnippet>128</a> <span class="kw">if let </span><span class="prelude-val">Some</span>(expr) = l.initializer() { |
| <a href=#129 id=129 data-nosnippet>129</a> walk_patterns_in_expr(<span class="kw-2">&</span>expr, cb); |
| <a href=#130 id=130 data-nosnippet>130</a> } |
| <a href=#131 id=131 data-nosnippet>131</a> preorder.skip_subtree(); |
| <a href=#132 id=132 data-nosnippet>132</a> } |
| <a href=#133 id=133 data-nosnippet>133</a> <span class="comment">// Don't skip subtree since we want to process the expression child next |
| <a href=#134 id=134 data-nosnippet>134</a> </span><span class="prelude-val">Some</span>(ast::Stmt::ExprStmt(<span class="kw">_</span>)) => (), |
| <a href=#135 id=135 data-nosnippet>135</a> <span class="comment">// skip inner items which might have their own patterns |
| <a href=#136 id=136 data-nosnippet>136</a> </span><span class="prelude-val">Some</span>(ast::Stmt::Item(<span class="kw">_</span>)) => preorder.skip_subtree(), |
| <a href=#137 id=137 data-nosnippet>137</a> <span class="prelude-val">None </span>=> { |
| <a href=#138 id=138 data-nosnippet>138</a> <span class="comment">// skip const args, those are a different context |
| <a href=#139 id=139 data-nosnippet>139</a> </span><span class="kw">if </span>ast::GenericArg::can_cast(node.kind()) { |
| <a href=#140 id=140 data-nosnippet>140</a> preorder.skip_subtree(); |
| <a href=#141 id=141 data-nosnippet>141</a> } <span class="kw">else if let </span><span class="prelude-val">Some</span>(expr) = ast::Expr::cast(node.clone()) { |
| <a href=#142 id=142 data-nosnippet>142</a> <span class="kw">let </span>is_different_context = <span class="kw">match </span><span class="kw-2">&</span>expr { |
| <a href=#143 id=143 data-nosnippet>143</a> ast::Expr::BlockExpr(block_expr) => { |
| <a href=#144 id=144 data-nosnippet>144</a> <span class="macro">matches!</span>( |
| <a href=#145 id=145 data-nosnippet>145</a> block_expr.modifier(), |
| <a href=#146 id=146 data-nosnippet>146</a> <span class="prelude-val">Some</span>( |
| <a href=#147 id=147 data-nosnippet>147</a> ast::BlockModifier::Async(<span class="kw">_</span>) |
| <a href=#148 id=148 data-nosnippet>148</a> | ast::BlockModifier::Try(<span class="kw">_</span>) |
| <a href=#149 id=149 data-nosnippet>149</a> | ast::BlockModifier::Const(<span class="kw">_</span>) |
| <a href=#150 id=150 data-nosnippet>150</a> ) |
| <a href=#151 id=151 data-nosnippet>151</a> ) |
| <a href=#152 id=152 data-nosnippet>152</a> } |
| <a href=#153 id=153 data-nosnippet>153</a> ast::Expr::ClosureExpr(<span class="kw">_</span>) => <span class="bool-val">true</span>, |
| <a href=#154 id=154 data-nosnippet>154</a> <span class="kw">_ </span>=> <span class="bool-val">false</span>, |
| <a href=#155 id=155 data-nosnippet>155</a> } && expr.syntax() != start.syntax(); |
| <a href=#156 id=156 data-nosnippet>156</a> <span class="kw">if </span>is_different_context { |
| <a href=#157 id=157 data-nosnippet>157</a> preorder.skip_subtree(); |
| <a href=#158 id=158 data-nosnippet>158</a> } |
| <a href=#159 id=159 data-nosnippet>159</a> } <span class="kw">else if let </span><span class="prelude-val">Some</span>(pat) = ast::Pat::cast(node) { |
| <a href=#160 id=160 data-nosnippet>160</a> preorder.skip_subtree(); |
| <a href=#161 id=161 data-nosnippet>161</a> <span class="kw">_ </span>= walk_pat(<span class="kw-2">&</span>pat, <span class="kw-2">&mut </span>|pat| { |
| <a href=#162 id=162 data-nosnippet>162</a> cb(pat); |
| <a href=#163 id=163 data-nosnippet>163</a> ControlFlow::<(), ()>::Continue(()) |
| <a href=#164 id=164 data-nosnippet>164</a> }); |
| <a href=#165 id=165 data-nosnippet>165</a> } |
| <a href=#166 id=166 data-nosnippet>166</a> } |
| <a href=#167 id=167 data-nosnippet>167</a> } |
| <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> |
| <a href=#171 id=171 data-nosnippet>171</a><span class="doccomment">/// Preorder walk all the pattern's sub patterns. |
| <a href=#172 id=172 data-nosnippet>172</a></span><span class="kw">pub fn </span>walk_pat<T>( |
| <a href=#173 id=173 data-nosnippet>173</a> pat: <span class="kw-2">&</span>ast::Pat, |
| <a href=#174 id=174 data-nosnippet>174</a> cb: <span class="kw-2">&mut </span><span class="kw">dyn </span>FnMut(ast::Pat) -> ControlFlow<T>, |
| <a href=#175 id=175 data-nosnippet>175</a>) -> ControlFlow<T> { |
| <a href=#176 id=176 data-nosnippet>176</a> <span class="kw">let </span><span class="kw-2">mut </span>preorder = pat.syntax().preorder(); |
| <a href=#177 id=177 data-nosnippet>177</a> <span class="kw">while let </span><span class="prelude-val">Some</span>(event) = preorder.next() { |
| <a href=#178 id=178 data-nosnippet>178</a> <span class="kw">let </span>node = <span class="kw">match </span>event { |
| <a href=#179 id=179 data-nosnippet>179</a> WalkEvent::Enter(node) => node, |
| <a href=#180 id=180 data-nosnippet>180</a> WalkEvent::Leave(<span class="kw">_</span>) => <span class="kw">continue</span>, |
| <a href=#181 id=181 data-nosnippet>181</a> }; |
| <a href=#182 id=182 data-nosnippet>182</a> <span class="kw">let </span>kind = node.kind(); |
| <a href=#183 id=183 data-nosnippet>183</a> <span class="kw">match </span>ast::Pat::cast(node) { |
| <a href=#184 id=184 data-nosnippet>184</a> <span class="prelude-val">Some</span>(pat @ ast::Pat::ConstBlockPat(<span class="kw">_</span>)) => { |
| <a href=#185 id=185 data-nosnippet>185</a> preorder.skip_subtree(); |
| <a href=#186 id=186 data-nosnippet>186</a> cb(pat)<span class="question-mark">?</span>; |
| <a href=#187 id=187 data-nosnippet>187</a> } |
| <a href=#188 id=188 data-nosnippet>188</a> <span class="prelude-val">Some</span>(pat) => { |
| <a href=#189 id=189 data-nosnippet>189</a> cb(pat)<span class="question-mark">?</span>; |
| <a href=#190 id=190 data-nosnippet>190</a> } |
| <a href=#191 id=191 data-nosnippet>191</a> <span class="comment">// skip const args |
| <a href=#192 id=192 data-nosnippet>192</a> </span><span class="prelude-val">None </span><span class="kw">if </span>ast::GenericArg::can_cast(kind) => { |
| <a href=#193 id=193 data-nosnippet>193</a> preorder.skip_subtree(); |
| <a href=#194 id=194 data-nosnippet>194</a> } |
| <a href=#195 id=195 data-nosnippet>195</a> <span class="prelude-val">None </span>=> (), |
| <a href=#196 id=196 data-nosnippet>196</a> } |
| <a href=#197 id=197 data-nosnippet>197</a> } |
| <a href=#198 id=198 data-nosnippet>198</a> ControlFlow::Continue(()) |
| <a href=#199 id=199 data-nosnippet>199</a>} |
| <a href=#200 id=200 data-nosnippet>200</a> |
| <a href=#201 id=201 data-nosnippet>201</a><span class="doccomment">/// Preorder walk all the type's sub types. |
| <a href=#202 id=202 data-nosnippet>202</a></span><span class="comment">// FIXME: Make the control flow more proper |
| <a href=#203 id=203 data-nosnippet>203</a></span><span class="kw">pub fn </span>walk_ty(ty: <span class="kw-2">&</span>ast::Type, cb: <span class="kw-2">&mut </span><span class="kw">dyn </span>FnMut(ast::Type) -> bool) { |
| <a href=#204 id=204 data-nosnippet>204</a> <span class="kw">let </span><span class="kw-2">mut </span>preorder = ty.syntax().preorder(); |
| <a href=#205 id=205 data-nosnippet>205</a> <span class="kw">while let </span><span class="prelude-val">Some</span>(event) = preorder.next() { |
| <a href=#206 id=206 data-nosnippet>206</a> <span class="kw">let </span>node = <span class="kw">match </span>event { |
| <a href=#207 id=207 data-nosnippet>207</a> WalkEvent::Enter(node) => node, |
| <a href=#208 id=208 data-nosnippet>208</a> WalkEvent::Leave(<span class="kw">_</span>) => <span class="kw">continue</span>, |
| <a href=#209 id=209 data-nosnippet>209</a> }; |
| <a href=#210 id=210 data-nosnippet>210</a> <span class="kw">let </span>kind = node.kind(); |
| <a href=#211 id=211 data-nosnippet>211</a> <span class="kw">match </span>ast::Type::cast(node) { |
| <a href=#212 id=212 data-nosnippet>212</a> <span class="prelude-val">Some</span>(ty @ ast::Type::MacroType(<span class="kw">_</span>)) => { |
| <a href=#213 id=213 data-nosnippet>213</a> preorder.skip_subtree(); |
| <a href=#214 id=214 data-nosnippet>214</a> cb(ty); |
| <a href=#215 id=215 data-nosnippet>215</a> } |
| <a href=#216 id=216 data-nosnippet>216</a> <span class="prelude-val">Some</span>(ty) => { |
| <a href=#217 id=217 data-nosnippet>217</a> <span class="kw">if </span>cb(ty) { |
| <a href=#218 id=218 data-nosnippet>218</a> preorder.skip_subtree(); |
| <a href=#219 id=219 data-nosnippet>219</a> } |
| <a href=#220 id=220 data-nosnippet>220</a> } |
| <a href=#221 id=221 data-nosnippet>221</a> <span class="comment">// skip const args |
| <a href=#222 id=222 data-nosnippet>222</a> </span><span class="prelude-val">None </span><span class="kw">if </span>ast::ConstArg::can_cast(kind) => { |
| <a href=#223 id=223 data-nosnippet>223</a> preorder.skip_subtree(); |
| <a href=#224 id=224 data-nosnippet>224</a> } |
| <a href=#225 id=225 data-nosnippet>225</a> <span class="prelude-val">None </span>=> (), |
| <a href=#226 id=226 data-nosnippet>226</a> } |
| <a href=#227 id=227 data-nosnippet>227</a> } |
| <a href=#228 id=228 data-nosnippet>228</a>} |
| <a href=#229 id=229 data-nosnippet>229</a> |
| <a href=#230 id=230 data-nosnippet>230</a><span class="kw">pub fn </span>vis_eq(this: <span class="kw-2">&</span>ast::Visibility, other: <span class="kw-2">&</span>ast::Visibility) -> bool { |
| <a href=#231 id=231 data-nosnippet>231</a> <span class="kw">match </span>(this.kind(), other.kind()) { |
| <a href=#232 id=232 data-nosnippet>232</a> (VisibilityKind::In(this), VisibilityKind::In(other)) => { |
| <a href=#233 id=233 data-nosnippet>233</a> stdx::iter_eq_by(this.segments(), other.segments(), |lhs, rhs| { |
| <a href=#234 id=234 data-nosnippet>234</a> lhs.kind().zip(rhs.kind()).is_some_and(|it| <span class="kw">match </span>it { |
| <a href=#235 id=235 data-nosnippet>235</a> (PathSegmentKind::CrateKw, PathSegmentKind::CrateKw) |
| <a href=#236 id=236 data-nosnippet>236</a> | (PathSegmentKind::SelfKw, PathSegmentKind::SelfKw) |
| <a href=#237 id=237 data-nosnippet>237</a> | (PathSegmentKind::SuperKw, PathSegmentKind::SuperKw) => <span class="bool-val">true</span>, |
| <a href=#238 id=238 data-nosnippet>238</a> (PathSegmentKind::Name(lhs), PathSegmentKind::Name(rhs)) => { |
| <a href=#239 id=239 data-nosnippet>239</a> lhs.text() == rhs.text() |
| <a href=#240 id=240 data-nosnippet>240</a> } |
| <a href=#241 id=241 data-nosnippet>241</a> <span class="kw">_ </span>=> <span class="bool-val">false</span>, |
| <a href=#242 id=242 data-nosnippet>242</a> }) |
| <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> (VisibilityKind::PubSelf, VisibilityKind::PubSelf) |
| <a href=#246 id=246 data-nosnippet>246</a> | (VisibilityKind::PubSuper, VisibilityKind::PubSuper) |
| <a href=#247 id=247 data-nosnippet>247</a> | (VisibilityKind::PubCrate, VisibilityKind::PubCrate) |
| <a href=#248 id=248 data-nosnippet>248</a> | (VisibilityKind::Pub, VisibilityKind::Pub) => <span class="bool-val">true</span>, |
| <a href=#249 id=249 data-nosnippet>249</a> <span class="kw">_ </span>=> <span class="bool-val">false</span>, |
| <a href=#250 id=250 data-nosnippet>250</a> } |
| <a href=#251 id=251 data-nosnippet>251</a>} |
| <a href=#252 id=252 data-nosnippet>252</a> |
| <a href=#253 id=253 data-nosnippet>253</a><span class="doccomment">/// Returns the `let` only if there is exactly one (that is, `let pat = expr` |
| <a href=#254 id=254 data-nosnippet>254</a>/// or `((let pat = expr))`, but not `let pat = expr && expr` or `non_let_expr`). |
| <a href=#255 id=255 data-nosnippet>255</a></span><span class="kw">pub fn </span>single_let(expr: ast::Expr) -> <span class="prelude-ty">Option</span><ast::LetExpr> { |
| <a href=#256 id=256 data-nosnippet>256</a> <span class="kw">match </span>expr { |
| <a href=#257 id=257 data-nosnippet>257</a> ast::Expr::ParenExpr(expr) => expr.expr().and_then(single_let), |
| <a href=#258 id=258 data-nosnippet>258</a> ast::Expr::LetExpr(expr) => <span class="prelude-val">Some</span>(expr), |
| <a href=#259 id=259 data-nosnippet>259</a> <span class="kw">_ </span>=> <span class="prelude-val">None</span>, |
| <a href=#260 id=260 data-nosnippet>260</a> } |
| <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="kw">pub fn </span>is_pattern_cond(expr: ast::Expr) -> bool { |
| <a href=#264 id=264 data-nosnippet>264</a> <span class="kw">match </span>expr { |
| <a href=#265 id=265 data-nosnippet>265</a> ast::Expr::BinExpr(expr) |
| <a href=#266 id=266 data-nosnippet>266</a> <span class="kw">if </span>expr.op_kind() == <span class="prelude-val">Some</span>(ast::BinaryOp::LogicOp(ast::LogicOp::And)) => |
| <a href=#267 id=267 data-nosnippet>267</a> { |
| <a href=#268 id=268 data-nosnippet>268</a> expr.lhs().map_or(<span class="bool-val">false</span>, is_pattern_cond) || expr.rhs().map_or(<span class="bool-val">false</span>, is_pattern_cond) |
| <a href=#269 id=269 data-nosnippet>269</a> } |
| <a href=#270 id=270 data-nosnippet>270</a> ast::Expr::ParenExpr(expr) => expr.expr().is_some_and(is_pattern_cond), |
| <a href=#271 id=271 data-nosnippet>271</a> ast::Expr::LetExpr(<span class="kw">_</span>) => <span class="bool-val">true</span>, |
| <a href=#272 id=272 data-nosnippet>272</a> <span class="kw">_ </span>=> <span class="bool-val">false</span>, |
| <a href=#273 id=273 data-nosnippet>273</a> } |
| <a href=#274 id=274 data-nosnippet>274</a>} |
| <a href=#275 id=275 data-nosnippet>275</a> |
| <a href=#276 id=276 data-nosnippet>276</a><span class="doccomment">/// Calls `cb` on each expression inside `expr` that is at "tail position". |
| <a href=#277 id=277 data-nosnippet>277</a>/// Does not walk into `break` or `return` expressions. |
| <a href=#278 id=278 data-nosnippet>278</a>/// Note that modifying the tree while iterating it will cause undefined iteration which might |
| <a href=#279 id=279 data-nosnippet>279</a>/// potentially results in an out of bounds panic. |
| <a href=#280 id=280 data-nosnippet>280</a></span><span class="kw">pub fn </span>for_each_tail_expr(expr: <span class="kw-2">&</span>ast::Expr, cb: <span class="kw-2">&mut </span><span class="kw">dyn </span>FnMut(<span class="kw-2">&</span>ast::Expr)) { |
| <a href=#281 id=281 data-nosnippet>281</a> <span class="kw">let </span>walk_loop = |cb: <span class="kw-2">&mut </span><span class="kw">dyn </span>FnMut(<span class="kw-2">&</span>ast::Expr), label, body: <span class="prelude-ty">Option</span><ast::BlockExpr>| { |
| <a href=#282 id=282 data-nosnippet>282</a> for_each_break_expr(label, body.and_then(|it| it.stmt_list()), <span class="kw-2">&mut </span>|b| { |
| <a href=#283 id=283 data-nosnippet>283</a> cb(<span class="kw-2">&</span>ast::Expr::BreakExpr(b)) |
| <a href=#284 id=284 data-nosnippet>284</a> }) |
| <a href=#285 id=285 data-nosnippet>285</a> }; |
| <a href=#286 id=286 data-nosnippet>286</a> <span class="kw">match </span>expr { |
| <a href=#287 id=287 data-nosnippet>287</a> ast::Expr::BlockExpr(b) => { |
| <a href=#288 id=288 data-nosnippet>288</a> <span class="kw">match </span>b.modifier() { |
| <a href=#289 id=289 data-nosnippet>289</a> <span class="prelude-val">Some</span>( |
| <a href=#290 id=290 data-nosnippet>290</a> ast::BlockModifier::Async(<span class="kw">_</span>) |
| <a href=#291 id=291 data-nosnippet>291</a> | ast::BlockModifier::Try(<span class="kw">_</span>) |
| <a href=#292 id=292 data-nosnippet>292</a> | ast::BlockModifier::Const(<span class="kw">_</span>), |
| <a href=#293 id=293 data-nosnippet>293</a> ) => <span class="kw">return </span>cb(expr), |
| <a href=#294 id=294 data-nosnippet>294</a> |
| <a href=#295 id=295 data-nosnippet>295</a> <span class="prelude-val">Some</span>(ast::BlockModifier::Label(label)) => { |
| <a href=#296 id=296 data-nosnippet>296</a> for_each_break_expr(<span class="prelude-val">Some</span>(label), b.stmt_list(), <span class="kw-2">&mut </span>|b| { |
| <a href=#297 id=297 data-nosnippet>297</a> cb(<span class="kw-2">&</span>ast::Expr::BreakExpr(b)) |
| <a href=#298 id=298 data-nosnippet>298</a> }); |
| <a href=#299 id=299 data-nosnippet>299</a> } |
| <a href=#300 id=300 data-nosnippet>300</a> <span class="prelude-val">Some</span>(ast::BlockModifier::Unsafe(<span class="kw">_</span>)) => (), |
| <a href=#301 id=301 data-nosnippet>301</a> <span class="prelude-val">Some</span>(ast::BlockModifier::Gen(<span class="kw">_</span>)) => (), |
| <a href=#302 id=302 data-nosnippet>302</a> <span class="prelude-val">Some</span>(ast::BlockModifier::AsyncGen(<span class="kw">_</span>)) => (), |
| <a href=#303 id=303 data-nosnippet>303</a> <span class="prelude-val">None </span>=> (), |
| <a href=#304 id=304 data-nosnippet>304</a> } |
| <a href=#305 id=305 data-nosnippet>305</a> <span class="kw">if let </span><span class="prelude-val">Some</span>(stmt_list) = b.stmt_list() |
| <a href=#306 id=306 data-nosnippet>306</a> && <span class="kw">let </span><span class="prelude-val">Some</span>(e) = stmt_list.tail_expr() |
| <a href=#307 id=307 data-nosnippet>307</a> { |
| <a href=#308 id=308 data-nosnippet>308</a> for_each_tail_expr(<span class="kw-2">&</span>e, cb); |
| <a href=#309 id=309 data-nosnippet>309</a> } |
| <a href=#310 id=310 data-nosnippet>310</a> } |
| <a href=#311 id=311 data-nosnippet>311</a> ast::Expr::IfExpr(if_) => { |
| <a href=#312 id=312 data-nosnippet>312</a> <span class="kw">let </span><span class="kw-2">mut </span>if_ = if_.clone(); |
| <a href=#313 id=313 data-nosnippet>313</a> <span class="kw">loop </span>{ |
| <a href=#314 id=314 data-nosnippet>314</a> <span class="kw">if let </span><span class="prelude-val">Some</span>(block) = if_.then_branch() { |
| <a href=#315 id=315 data-nosnippet>315</a> for_each_tail_expr(<span class="kw-2">&</span>ast::Expr::BlockExpr(block), cb); |
| <a href=#316 id=316 data-nosnippet>316</a> } |
| <a href=#317 id=317 data-nosnippet>317</a> <span class="kw">match </span>if_.else_branch() { |
| <a href=#318 id=318 data-nosnippet>318</a> <span class="prelude-val">Some</span>(ast::ElseBranch::IfExpr(it)) => if_ = it, |
| <a href=#319 id=319 data-nosnippet>319</a> <span class="prelude-val">Some</span>(ast::ElseBranch::Block(block)) => { |
| <a href=#320 id=320 data-nosnippet>320</a> for_each_tail_expr(<span class="kw-2">&</span>ast::Expr::BlockExpr(block), cb); |
| <a href=#321 id=321 data-nosnippet>321</a> <span class="kw">break</span>; |
| <a href=#322 id=322 data-nosnippet>322</a> } |
| <a href=#323 id=323 data-nosnippet>323</a> <span class="prelude-val">None </span>=> <span class="kw">break</span>, |
| <a href=#324 id=324 data-nosnippet>324</a> } |
| <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> ast::Expr::LoopExpr(l) => walk_loop(cb, l.label(), l.loop_body()), |
| <a href=#328 id=328 data-nosnippet>328</a> ast::Expr::WhileExpr(w) => walk_loop(cb, w.label(), w.loop_body()), |
| <a href=#329 id=329 data-nosnippet>329</a> ast::Expr::ForExpr(f) => walk_loop(cb, f.label(), f.loop_body()), |
| <a href=#330 id=330 data-nosnippet>330</a> ast::Expr::MatchExpr(m) => { |
| <a href=#331 id=331 data-nosnippet>331</a> <span class="kw">if let </span><span class="prelude-val">Some</span>(arms) = m.match_arm_list() { |
| <a href=#332 id=332 data-nosnippet>332</a> arms.arms().filter_map(|arm| arm.expr()).for_each(|e| for_each_tail_expr(<span class="kw-2">&</span>e, cb)); |
| <a href=#333 id=333 data-nosnippet>333</a> } |
| <a href=#334 id=334 data-nosnippet>334</a> } |
| <a href=#335 id=335 data-nosnippet>335</a> ast::Expr::ArrayExpr(<span class="kw">_</span>) |
| <a href=#336 id=336 data-nosnippet>336</a> | ast::Expr::AwaitExpr(<span class="kw">_</span>) |
| <a href=#337 id=337 data-nosnippet>337</a> | ast::Expr::BinExpr(<span class="kw">_</span>) |
| <a href=#338 id=338 data-nosnippet>338</a> | ast::Expr::BreakExpr(<span class="kw">_</span>) |
| <a href=#339 id=339 data-nosnippet>339</a> | ast::Expr::CallExpr(<span class="kw">_</span>) |
| <a href=#340 id=340 data-nosnippet>340</a> | ast::Expr::CastExpr(<span class="kw">_</span>) |
| <a href=#341 id=341 data-nosnippet>341</a> | ast::Expr::ClosureExpr(<span class="kw">_</span>) |
| <a href=#342 id=342 data-nosnippet>342</a> | ast::Expr::ContinueExpr(<span class="kw">_</span>) |
| <a href=#343 id=343 data-nosnippet>343</a> | ast::Expr::FieldExpr(<span class="kw">_</span>) |
| <a href=#344 id=344 data-nosnippet>344</a> | ast::Expr::IndexExpr(<span class="kw">_</span>) |
| <a href=#345 id=345 data-nosnippet>345</a> | ast::Expr::Literal(<span class="kw">_</span>) |
| <a href=#346 id=346 data-nosnippet>346</a> | ast::Expr::MacroExpr(<span class="kw">_</span>) |
| <a href=#347 id=347 data-nosnippet>347</a> | ast::Expr::MethodCallExpr(<span class="kw">_</span>) |
| <a href=#348 id=348 data-nosnippet>348</a> | ast::Expr::ParenExpr(<span class="kw">_</span>) |
| <a href=#349 id=349 data-nosnippet>349</a> | ast::Expr::PathExpr(<span class="kw">_</span>) |
| <a href=#350 id=350 data-nosnippet>350</a> | ast::Expr::PrefixExpr(<span class="kw">_</span>) |
| <a href=#351 id=351 data-nosnippet>351</a> | ast::Expr::RangeExpr(<span class="kw">_</span>) |
| <a href=#352 id=352 data-nosnippet>352</a> | ast::Expr::RecordExpr(<span class="kw">_</span>) |
| <a href=#353 id=353 data-nosnippet>353</a> | ast::Expr::RefExpr(<span class="kw">_</span>) |
| <a href=#354 id=354 data-nosnippet>354</a> | ast::Expr::ReturnExpr(<span class="kw">_</span>) |
| <a href=#355 id=355 data-nosnippet>355</a> | ast::Expr::BecomeExpr(<span class="kw">_</span>) |
| <a href=#356 id=356 data-nosnippet>356</a> | ast::Expr::TryExpr(<span class="kw">_</span>) |
| <a href=#357 id=357 data-nosnippet>357</a> | ast::Expr::TupleExpr(<span class="kw">_</span>) |
| <a href=#358 id=358 data-nosnippet>358</a> | ast::Expr::LetExpr(<span class="kw">_</span>) |
| <a href=#359 id=359 data-nosnippet>359</a> | ast::Expr::UnderscoreExpr(<span class="kw">_</span>) |
| <a href=#360 id=360 data-nosnippet>360</a> | ast::Expr::YieldExpr(<span class="kw">_</span>) |
| <a href=#361 id=361 data-nosnippet>361</a> | ast::Expr::YeetExpr(<span class="kw">_</span>) |
| <a href=#362 id=362 data-nosnippet>362</a> | ast::Expr::OffsetOfExpr(<span class="kw">_</span>) |
| <a href=#363 id=363 data-nosnippet>363</a> | ast::Expr::FormatArgsExpr(<span class="kw">_</span>) |
| <a href=#364 id=364 data-nosnippet>364</a> | ast::Expr::AsmExpr(<span class="kw">_</span>) => cb(expr), |
| <a href=#365 id=365 data-nosnippet>365</a> } |
| <a href=#366 id=366 data-nosnippet>366</a>} |
| <a href=#367 id=367 data-nosnippet>367</a> |
| <a href=#368 id=368 data-nosnippet>368</a><span class="kw">pub fn </span>for_each_break_and_continue_expr( |
| <a href=#369 id=369 data-nosnippet>369</a> label: <span class="prelude-ty">Option</span><ast::Label>, |
| <a href=#370 id=370 data-nosnippet>370</a> body: <span class="prelude-ty">Option</span><ast::StmtList>, |
| <a href=#371 id=371 data-nosnippet>371</a> cb: <span class="kw-2">&mut </span><span class="kw">dyn </span>FnMut(ast::Expr), |
| <a href=#372 id=372 data-nosnippet>372</a>) { |
| <a href=#373 id=373 data-nosnippet>373</a> <span class="kw">let </span>label = label.and_then(|lbl| lbl.lifetime()); |
| <a href=#374 id=374 data-nosnippet>374</a> <span class="kw">if let </span><span class="prelude-val">Some</span>(b) = body { |
| <a href=#375 id=375 data-nosnippet>375</a> <span class="kw">let </span>tree_depth_iterator = TreeWithDepthIterator::new(b); |
| <a href=#376 id=376 data-nosnippet>376</a> <span class="kw">for </span>(expr, depth) <span class="kw">in </span>tree_depth_iterator { |
| <a href=#377 id=377 data-nosnippet>377</a> <span class="kw">match </span>expr { |
| <a href=#378 id=378 data-nosnippet>378</a> ast::Expr::BreakExpr(b) |
| <a href=#379 id=379 data-nosnippet>379</a> <span class="kw">if </span>(depth == <span class="number">0 </span>&& b.lifetime().is_none()) |
| <a href=#380 id=380 data-nosnippet>380</a> || eq_label_lt(<span class="kw-2">&</span>label, <span class="kw-2">&</span>b.lifetime()) => |
| <a href=#381 id=381 data-nosnippet>381</a> { |
| <a href=#382 id=382 data-nosnippet>382</a> cb(ast::Expr::BreakExpr(b)); |
| <a href=#383 id=383 data-nosnippet>383</a> } |
| <a href=#384 id=384 data-nosnippet>384</a> ast::Expr::ContinueExpr(c) |
| <a href=#385 id=385 data-nosnippet>385</a> <span class="kw">if </span>(depth == <span class="number">0 </span>&& c.lifetime().is_none()) |
| <a href=#386 id=386 data-nosnippet>386</a> || eq_label_lt(<span class="kw-2">&</span>label, <span class="kw-2">&</span>c.lifetime()) => |
| <a href=#387 id=387 data-nosnippet>387</a> { |
| <a href=#388 id=388 data-nosnippet>388</a> cb(ast::Expr::ContinueExpr(c)); |
| <a href=#389 id=389 data-nosnippet>389</a> } |
| <a href=#390 id=390 data-nosnippet>390</a> <span class="kw">_ </span>=> (), |
| <a href=#391 id=391 data-nosnippet>391</a> } |
| <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>} |
| <a href=#395 id=395 data-nosnippet>395</a> |
| <a href=#396 id=396 data-nosnippet>396</a><span class="kw">fn </span>for_each_break_expr( |
| <a href=#397 id=397 data-nosnippet>397</a> label: <span class="prelude-ty">Option</span><ast::Label>, |
| <a href=#398 id=398 data-nosnippet>398</a> body: <span class="prelude-ty">Option</span><ast::StmtList>, |
| <a href=#399 id=399 data-nosnippet>399</a> cb: <span class="kw-2">&mut </span><span class="kw">dyn </span>FnMut(ast::BreakExpr), |
| <a href=#400 id=400 data-nosnippet>400</a>) { |
| <a href=#401 id=401 data-nosnippet>401</a> <span class="kw">let </span>label = label.and_then(|lbl| lbl.lifetime()); |
| <a href=#402 id=402 data-nosnippet>402</a> <span class="kw">if let </span><span class="prelude-val">Some</span>(b) = body { |
| <a href=#403 id=403 data-nosnippet>403</a> <span class="kw">let </span>tree_depth_iterator = TreeWithDepthIterator::new(b); |
| <a href=#404 id=404 data-nosnippet>404</a> <span class="kw">for </span>(expr, depth) <span class="kw">in </span>tree_depth_iterator { |
| <a href=#405 id=405 data-nosnippet>405</a> <span class="kw">match </span>expr { |
| <a href=#406 id=406 data-nosnippet>406</a> ast::Expr::BreakExpr(b) |
| <a href=#407 id=407 data-nosnippet>407</a> <span class="kw">if </span>(depth == <span class="number">0 </span>&& b.lifetime().is_none()) |
| <a href=#408 id=408 data-nosnippet>408</a> || eq_label_lt(<span class="kw-2">&</span>label, <span class="kw-2">&</span>b.lifetime()) => |
| <a href=#409 id=409 data-nosnippet>409</a> { |
| <a href=#410 id=410 data-nosnippet>410</a> cb(b); |
| <a href=#411 id=411 data-nosnippet>411</a> } |
| <a href=#412 id=412 data-nosnippet>412</a> <span class="kw">_ </span>=> (), |
| <a href=#413 id=413 data-nosnippet>413</a> } |
| <a href=#414 id=414 data-nosnippet>414</a> } |
| <a href=#415 id=415 data-nosnippet>415</a> } |
| <a href=#416 id=416 data-nosnippet>416</a>} |
| <a href=#417 id=417 data-nosnippet>417</a> |
| <a href=#418 id=418 data-nosnippet>418</a><span class="kw">pub fn </span>eq_label_lt(lt1: <span class="kw-2">&</span><span class="prelude-ty">Option</span><ast::Lifetime>, lt2: <span class="kw-2">&</span><span class="prelude-ty">Option</span><ast::Lifetime>) -> bool { |
| <a href=#419 id=419 data-nosnippet>419</a> lt1.as_ref().zip(lt2.as_ref()).is_some_and(|(lt, lbl)| lt.text() == lbl.text()) |
| <a href=#420 id=420 data-nosnippet>420</a>} |
| <a href=#421 id=421 data-nosnippet>421</a> |
| <a href=#422 id=422 data-nosnippet>422</a><span class="kw">struct </span>TreeWithDepthIterator { |
| <a href=#423 id=423 data-nosnippet>423</a> preorder: Preorder<RustLanguage>, |
| <a href=#424 id=424 data-nosnippet>424</a> depth: u32, |
| <a href=#425 id=425 data-nosnippet>425</a>} |
| <a href=#426 id=426 data-nosnippet>426</a> |
| <a href=#427 id=427 data-nosnippet>427</a><span class="kw">impl </span>TreeWithDepthIterator { |
| <a href=#428 id=428 data-nosnippet>428</a> <span class="kw">fn </span>new(body: ast::StmtList) -> <span class="self">Self </span>{ |
| <a href=#429 id=429 data-nosnippet>429</a> <span class="kw">let </span>preorder = body.syntax().preorder(); |
| <a href=#430 id=430 data-nosnippet>430</a> <span class="self">Self </span>{ preorder, depth: <span class="number">0 </span>} |
| <a href=#431 id=431 data-nosnippet>431</a> } |
| <a href=#432 id=432 data-nosnippet>432</a>} |
| <a href=#433 id=433 data-nosnippet>433</a> |
| <a href=#434 id=434 data-nosnippet>434</a><span class="kw">impl </span>Iterator <span class="kw">for </span>TreeWithDepthIterator { |
| <a href=#435 id=435 data-nosnippet>435</a> <span class="kw">type </span>Item = (ast::Expr, u32); |
| <a href=#436 id=436 data-nosnippet>436</a> |
| <a href=#437 id=437 data-nosnippet>437</a> <span class="kw">fn </span>next(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><<span class="self">Self</span>::Item> { |
| <a href=#438 id=438 data-nosnippet>438</a> <span class="kw">while let </span><span class="prelude-val">Some</span>(event) = <span class="self">self</span>.preorder.find_map(|ev| <span class="kw">match </span>ev { |
| <a href=#439 id=439 data-nosnippet>439</a> WalkEvent::Enter(it) => ast::Expr::cast(it).map(WalkEvent::Enter), |
| <a href=#440 id=440 data-nosnippet>440</a> WalkEvent::Leave(it) => ast::Expr::cast(it).map(WalkEvent::Leave), |
| <a href=#441 id=441 data-nosnippet>441</a> }) { |
| <a href=#442 id=442 data-nosnippet>442</a> <span class="kw">match </span>event { |
| <a href=#443 id=443 data-nosnippet>443</a> WalkEvent::Enter( |
| <a href=#444 id=444 data-nosnippet>444</a> ast::Expr::LoopExpr(<span class="kw">_</span>) | ast::Expr::WhileExpr(<span class="kw">_</span>) | ast::Expr::ForExpr(<span class="kw">_</span>), |
| <a href=#445 id=445 data-nosnippet>445</a> ) => { |
| <a href=#446 id=446 data-nosnippet>446</a> <span class="self">self</span>.depth += <span class="number">1</span>; |
| <a href=#447 id=447 data-nosnippet>447</a> } |
| <a href=#448 id=448 data-nosnippet>448</a> WalkEvent::Leave( |
| <a href=#449 id=449 data-nosnippet>449</a> ast::Expr::LoopExpr(<span class="kw">_</span>) | ast::Expr::WhileExpr(<span class="kw">_</span>) | ast::Expr::ForExpr(<span class="kw">_</span>), |
| <a href=#450 id=450 data-nosnippet>450</a> ) => { |
| <a href=#451 id=451 data-nosnippet>451</a> <span class="self">self</span>.depth -= <span class="number">1</span>; |
| <a href=#452 id=452 data-nosnippet>452</a> } |
| <a href=#453 id=453 data-nosnippet>453</a> WalkEvent::Enter(ast::Expr::BlockExpr(e)) <span class="kw">if </span>e.label().is_some() => { |
| <a href=#454 id=454 data-nosnippet>454</a> <span class="self">self</span>.depth += <span class="number">1</span>; |
| <a href=#455 id=455 data-nosnippet>455</a> } |
| <a href=#456 id=456 data-nosnippet>456</a> WalkEvent::Leave(ast::Expr::BlockExpr(e)) <span class="kw">if </span>e.label().is_some() => { |
| <a href=#457 id=457 data-nosnippet>457</a> <span class="self">self</span>.depth -= <span class="number">1</span>; |
| <a href=#458 id=458 data-nosnippet>458</a> } |
| <a href=#459 id=459 data-nosnippet>459</a> WalkEvent::Enter(expr) => <span class="kw">return </span><span class="prelude-val">Some</span>((expr, <span class="self">self</span>.depth)), |
| <a href=#460 id=460 data-nosnippet>460</a> <span class="kw">_ </span>=> (), |
| <a href=#461 id=461 data-nosnippet>461</a> } |
| <a href=#462 id=462 data-nosnippet>462</a> } |
| <a href=#463 id=463 data-nosnippet>463</a> <span class="prelude-val">None |
| <a href=#464 id=464 data-nosnippet>464</a> </span>} |
| <a href=#465 id=465 data-nosnippet>465</a>} |
| <a href=#466 id=466 data-nosnippet>466</a> |
| <a href=#467 id=467 data-nosnippet>467</a><span class="doccomment">/// Parses the input token tree as comma separated plain paths. |
| <a href=#468 id=468 data-nosnippet>468</a></span><span class="kw">pub fn </span>parse_tt_as_comma_sep_paths( |
| <a href=#469 id=469 data-nosnippet>469</a> input: ast::TokenTree, |
| <a href=#470 id=470 data-nosnippet>470</a> edition: Edition, |
| <a href=#471 id=471 data-nosnippet>471</a>) -> <span class="prelude-ty">Option</span><Vec<ast::Path>> { |
| <a href=#472 id=472 data-nosnippet>472</a> <span class="kw">let </span>r_paren = input.r_paren_token(); |
| <a href=#473 id=473 data-nosnippet>473</a> <span class="kw">let </span>tokens = |
| <a href=#474 id=474 data-nosnippet>474</a> input.syntax().children_with_tokens().skip(<span class="number">1</span>).map_while(|it| <span class="kw">match </span>it.into_token() { |
| <a href=#475 id=475 data-nosnippet>475</a> <span class="comment">// seeing a keyword means the attribute is unclosed so stop parsing here |
| <a href=#476 id=476 data-nosnippet>476</a> </span><span class="prelude-val">Some</span>(tok) <span class="kw">if </span>tok.kind().is_keyword(edition) => <span class="prelude-val">None</span>, |
| <a href=#477 id=477 data-nosnippet>477</a> <span class="comment">// don't include the right token tree parenthesis if it exists |
| <a href=#478 id=478 data-nosnippet>478</a> </span>tok @ <span class="prelude-val">Some</span>(<span class="kw">_</span>) <span class="kw">if </span>tok == r_paren => <span class="prelude-val">None</span>, |
| <a href=#479 id=479 data-nosnippet>479</a> <span class="comment">// only nodes that we can find are other TokenTrees, those are unexpected in this parse though |
| <a href=#480 id=480 data-nosnippet>480</a> </span><span class="prelude-val">None </span>=> <span class="prelude-val">None</span>, |
| <a href=#481 id=481 data-nosnippet>481</a> <span class="prelude-val">Some</span>(tok) => <span class="prelude-val">Some</span>(tok), |
| <a href=#482 id=482 data-nosnippet>482</a> }); |
| <a href=#483 id=483 data-nosnippet>483</a> <span class="kw">let </span>input_expressions = tokens.chunk_by(|tok| tok.kind() == <span class="macro">T!</span>[,]); |
| <a href=#484 id=484 data-nosnippet>484</a> <span class="kw">let </span>paths = input_expressions |
| <a href=#485 id=485 data-nosnippet>485</a> .into_iter() |
| <a href=#486 id=486 data-nosnippet>486</a> .filter_map(|(is_sep, group)| (!is_sep).then_some(group)) |
| <a href=#487 id=487 data-nosnippet>487</a> .filter_map(|<span class="kw-2">mut </span>tokens| { |
| <a href=#488 id=488 data-nosnippet>488</a> syntax::hacks::parse_expr_from_str(<span class="kw-2">&</span>tokens.join(<span class="string">""</span>), Edition::CURRENT).and_then( |
| <a href=#489 id=489 data-nosnippet>489</a> |expr| <span class="kw">match </span>expr { |
| <a href=#490 id=490 data-nosnippet>490</a> ast::Expr::PathExpr(it) => it.path(), |
| <a href=#491 id=491 data-nosnippet>491</a> <span class="kw">_ </span>=> <span class="prelude-val">None</span>, |
| <a href=#492 id=492 data-nosnippet>492</a> }, |
| <a href=#493 id=493 data-nosnippet>493</a> ) |
| <a href=#494 id=494 data-nosnippet>494</a> }) |
| <a href=#495 id=495 data-nosnippet>495</a> .collect(); |
| <a href=#496 id=496 data-nosnippet>496</a> <span class="prelude-val">Some</span>(paths) |
| <a href=#497 id=497 data-nosnippet>497</a>} |
| <a href=#498 id=498 data-nosnippet>498</a> |
| <a href=#499 id=499 data-nosnippet>499</a><span class="kw">pub fn </span>macro_call_for_string_token(string: <span class="kw-2">&</span>ast::String) -> <span class="prelude-ty">Option</span><MacroCall> { |
| <a href=#500 id=500 data-nosnippet>500</a> <span class="kw">let </span>macro_call = string.syntax().parent_ancestors().find_map(ast::MacroCall::cast)<span class="question-mark">?</span>; |
| <a href=#501 id=501 data-nosnippet>501</a> <span class="prelude-val">Some</span>(macro_call) |
| <a href=#502 id=502 data-nosnippet>502</a>}</code></pre></div></section></main></body></html> |
