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13 |
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14 | import {zwitch} from 'zwitch'
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15 | import {nest} from './nest.js'
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16 | import {pseudo} from './pseudo.js'
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17 | import {test} from './test.js'
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18 | import {root} from './util.js'
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19 |
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20 | const type = zwitch('type', {
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21 |
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22 | unknown: unknownType,
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23 | invalid: invalidType,
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24 |
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25 | handlers: {selectors, ruleSet, rule}
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26 | })
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27 |
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28 |
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29 |
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30 |
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31 |
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32 |
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33 |
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34 | export function any(query, node, state) {
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35 |
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36 | return query && node ? type(query, node, state) : []
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37 | }
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38 |
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39 |
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40 |
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41 |
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42 |
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43 |
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44 | function selectors(query, node, state) {
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45 | const collect = collector(state.one)
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46 | let index = -1
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47 |
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48 | while (++index < query.selectors.length) {
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49 | collect(ruleSet(query.selectors[index], node, state))
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50 | }
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51 |
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52 | return collect.result
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53 | }
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54 |
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55 |
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56 |
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57 |
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58 |
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59 |
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60 | function ruleSet(query, node, state) {
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61 | return rule(query.rule, node, state)
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62 | }
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63 |
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64 |
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65 |
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66 |
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67 |
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68 |
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69 | function rule(query, tree, state) {
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70 | const collect = collector(state.one)
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71 |
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72 | if (state.shallow && query.rule) {
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73 | throw new Error('Expected selector without nesting')
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74 | }
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75 |
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76 | nest(
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77 | query,
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78 | tree,
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79 | 0,
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80 | null,
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81 | configure(query, {
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82 | scopeNodes: root(tree) ? tree.children : [tree],
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83 | index: false,
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84 | iterator,
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85 | one: state.one,
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86 | shallow: state.shallow,
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87 | any: state.any
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88 | })
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89 | )
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90 |
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91 | return collect.result
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92 |
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93 |
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94 | function iterator(query, node, index, parent, state) {
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95 | if (test(query, node, index, parent, state)) {
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96 | if (query.rule) {
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97 | nest(query.rule, node, index, parent, configure(query.rule, state))
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98 | } else {
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99 | collect(node)
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100 | state.found = true
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101 | }
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102 | }
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103 | }
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104 | }
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105 |
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106 |
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107 |
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108 |
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109 |
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110 |
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111 |
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112 | function configure(query, state) {
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113 | const pseudos = query.pseudos || []
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114 | let index = -1
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115 |
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116 | while (++index < pseudos.length) {
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117 | if (pseudo.needsIndex.includes(pseudos[index].name)) {
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118 | state.index = true
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119 | break
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120 | }
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121 | }
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122 |
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123 | return state
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124 | }
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125 |
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126 |
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127 |
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128 |
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129 |
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130 |
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131 | function unknownType(query) {
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132 | throw new Error('Unknown type `' + query.type + '`')
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133 | }
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134 |
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135 |
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136 |
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137 | function invalidType() {
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138 | throw new Error('Invalid type')
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139 | }
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140 |
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141 |
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142 |
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143 |
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144 | function collector(one) {
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145 |
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146 | const result = []
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147 |
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148 | let found
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149 |
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150 | collect.result = result
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151 |
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152 | return collect
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153 |
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154 | |
155 |
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156 |
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157 |
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158 |
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159 | function collect(node) {
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160 | let index = -1
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161 |
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162 | if ('length' in node) {
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163 | while (++index < node.length) {
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164 | collectOne(node[index])
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165 | }
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166 | } else {
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167 | collectOne(node)
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168 | }
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169 | }
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170 |
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171 | |
172 |
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173 |
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174 | function collectOne(node) {
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175 | if (one) {
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176 |
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177 |
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178 | if (found) throw new Error('Cannot collect multiple nodes')
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179 |
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180 | found = true
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181 | }
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182 |
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183 | if (!result.includes(node)) result.push(node)
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184 | }
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185 | }
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