1 | "use strict";
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2 |
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3 | Object.defineProperty(exports, "__esModule", {
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4 | value: true
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5 | });
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6 | exports.default = convertFunctionRest;
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7 |
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8 | var _core = require("@babel/core");
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9 |
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10 | const buildRest = (0, _core.template)(`
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11 | for (var LEN = ARGUMENTS.length,
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12 | ARRAY = new Array(ARRAY_LEN),
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13 | KEY = START;
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14 | KEY < LEN;
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15 | KEY++) {
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16 | ARRAY[ARRAY_KEY] = ARGUMENTS[KEY];
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17 | }
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18 | `);
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19 | const restIndex = (0, _core.template)(`
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20 | (INDEX < OFFSET || ARGUMENTS.length <= INDEX) ? undefined : ARGUMENTS[INDEX]
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21 | `);
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22 | const restIndexImpure = (0, _core.template)(`
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23 | REF = INDEX, (REF < OFFSET || ARGUMENTS.length <= REF) ? undefined : ARGUMENTS[REF]
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24 | `);
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25 | const restLength = (0, _core.template)(`
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26 | ARGUMENTS.length <= OFFSET ? 0 : ARGUMENTS.length - OFFSET
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27 | `);
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28 |
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29 | function referencesRest(path, state) {
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30 | if (path.node.name === state.name) {
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31 | return path.scope.bindingIdentifierEquals(state.name, state.outerBinding);
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32 | }
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33 |
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34 | return false;
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35 | }
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36 |
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37 | const memberExpressionOptimisationVisitor = {
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38 | Scope(path, state) {
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39 | if (!path.scope.bindingIdentifierEquals(state.name, state.outerBinding)) {
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40 | path.skip();
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41 | }
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42 | },
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43 |
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44 | Flow(path) {
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45 | if (path.isTypeCastExpression()) return;
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46 | path.skip();
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47 | },
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48 |
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49 | Function(path, state) {
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50 | const oldNoOptimise = state.noOptimise;
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51 | state.noOptimise = true;
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52 | path.traverse(memberExpressionOptimisationVisitor, state);
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53 | state.noOptimise = oldNoOptimise;
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54 | path.skip();
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55 | },
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56 |
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57 | ReferencedIdentifier(path, state) {
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58 | const {
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59 | node
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60 | } = path;
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61 |
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62 | if (node.name === "arguments") {
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63 | state.deopted = true;
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64 | }
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65 |
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66 | if (!referencesRest(path, state)) return;
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67 |
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68 | if (state.noOptimise) {
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69 | state.deopted = true;
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70 | } else {
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71 | const {
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72 | parentPath
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73 | } = path;
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74 |
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75 | if (parentPath.listKey === "params" && parentPath.key < state.offset) {
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76 | return;
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77 | }
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78 |
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79 | if (parentPath.isMemberExpression({
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80 | object: node
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81 | })) {
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82 | const grandparentPath = parentPath.parentPath;
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83 | const argsOptEligible = !state.deopted && !(grandparentPath.isAssignmentExpression() && parentPath.node === grandparentPath.node.left || grandparentPath.isLVal() || grandparentPath.isForXStatement() || grandparentPath.isUpdateExpression() || grandparentPath.isUnaryExpression({
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84 | operator: "delete"
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85 | }) || (grandparentPath.isCallExpression() || grandparentPath.isNewExpression()) && parentPath.node === grandparentPath.node.callee);
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86 |
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87 | if (argsOptEligible) {
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88 | if (parentPath.node.computed) {
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89 | if (parentPath.get("property").isBaseType("number")) {
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90 | state.candidates.push({
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91 | cause: "indexGetter",
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92 | path
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93 | });
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94 | return;
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95 | }
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96 | } else if (parentPath.node.property.name === "length") {
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97 | state.candidates.push({
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98 | cause: "lengthGetter",
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99 | path
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100 | });
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101 | return;
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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 | if (state.offset === 0 && parentPath.isSpreadElement()) {
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107 | const call = parentPath.parentPath;
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108 |
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109 | if (call.isCallExpression() && call.node.arguments.length === 1) {
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110 | state.candidates.push({
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111 | cause: "argSpread",
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112 | path
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113 | });
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114 | return;
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115 | }
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116 | }
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117 |
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118 | state.references.push(path);
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119 | }
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120 | },
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121 |
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122 | BindingIdentifier(path, state) {
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123 | if (referencesRest(path, state)) {
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124 | state.deopted = true;
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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 | function getParamsCount(node) {
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131 | let count = node.params.length;
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132 |
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133 | if (count > 0 && _core.types.isIdentifier(node.params[0], {
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134 | name: "this"
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135 | })) {
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136 | count -= 1;
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137 | }
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138 |
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139 | return count;
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140 | }
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141 |
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142 | function hasRest(node) {
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143 | const length = node.params.length;
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144 | return length > 0 && _core.types.isRestElement(node.params[length - 1]);
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145 | }
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146 |
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147 | function optimiseIndexGetter(path, argsId, offset) {
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148 | const offsetLiteral = _core.types.numericLiteral(offset);
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149 |
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150 | let index;
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151 |
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152 | if (_core.types.isNumericLiteral(path.parent.property)) {
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153 | index = _core.types.numericLiteral(path.parent.property.value + offset);
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154 | } else if (offset === 0) {
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155 | index = path.parent.property;
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156 | } else {
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157 | index = _core.types.binaryExpression("+", path.parent.property, _core.types.cloneNode(offsetLiteral));
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158 | }
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159 |
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160 | const {
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161 | scope
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162 | } = path;
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163 |
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164 | if (!scope.isPure(index)) {
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165 | const temp = scope.generateUidIdentifierBasedOnNode(index);
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166 | scope.push({
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167 | id: temp,
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168 | kind: "var"
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169 | });
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170 | path.parentPath.replaceWith(restIndexImpure({
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171 | ARGUMENTS: argsId,
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172 | OFFSET: offsetLiteral,
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173 | INDEX: index,
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174 | REF: _core.types.cloneNode(temp)
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175 | }));
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176 | } else {
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177 | const parentPath = path.parentPath;
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178 | parentPath.replaceWith(restIndex({
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179 | ARGUMENTS: argsId,
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180 | OFFSET: offsetLiteral,
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181 | INDEX: index
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182 | }));
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183 | const offsetTestPath = parentPath.get("test").get("left");
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184 | const valRes = offsetTestPath.evaluate();
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185 |
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186 | if (valRes.confident) {
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187 | if (valRes.value === true) {
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188 | parentPath.replaceWith(parentPath.scope.buildUndefinedNode());
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189 | } else {
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190 | parentPath.get("test").replaceWith(parentPath.get("test").get("right"));
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191 | }
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192 | }
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193 | }
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194 | }
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195 |
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196 | function optimiseLengthGetter(path, argsId, offset) {
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197 | if (offset) {
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198 | path.parentPath.replaceWith(restLength({
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199 | ARGUMENTS: argsId,
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200 | OFFSET: _core.types.numericLiteral(offset)
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201 | }));
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202 | } else {
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203 | path.replaceWith(argsId);
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204 | }
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205 | }
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206 |
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207 | function convertFunctionRest(path) {
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208 | const {
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209 | node,
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210 | scope
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211 | } = path;
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212 | if (!hasRest(node)) return false;
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213 | let rest = node.params.pop().argument;
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214 |
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215 | const argsId = _core.types.identifier("arguments");
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216 |
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217 | if (_core.types.isPattern(rest)) {
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218 | const pattern = rest;
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219 | rest = scope.generateUidIdentifier("ref");
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220 |
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221 | const declar = _core.types.variableDeclaration("let", [_core.types.variableDeclarator(pattern, rest)]);
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222 |
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223 | node.body.body.unshift(declar);
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224 | }
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225 |
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226 | const paramsCount = getParamsCount(node);
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227 | const state = {
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228 | references: [],
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229 | offset: paramsCount,
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230 | argumentsNode: argsId,
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231 | outerBinding: scope.getBindingIdentifier(rest.name),
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232 | candidates: [],
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233 | name: rest.name,
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234 | deopted: false
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235 | };
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236 | path.traverse(memberExpressionOptimisationVisitor, state);
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237 |
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238 | if (!state.deopted && !state.references.length) {
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239 | for (const {
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240 | path,
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241 | cause
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242 | } of state.candidates) {
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243 | const clonedArgsId = _core.types.cloneNode(argsId);
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244 |
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245 | switch (cause) {
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246 | case "indexGetter":
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247 | optimiseIndexGetter(path, clonedArgsId, state.offset);
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248 | break;
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249 |
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250 | case "lengthGetter":
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251 | optimiseLengthGetter(path, clonedArgsId, state.offset);
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252 | break;
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253 |
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254 | default:
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255 | path.replaceWith(clonedArgsId);
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256 | }
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257 | }
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258 |
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259 | return true;
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260 | }
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261 |
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262 | state.references.push(...state.candidates.map(({
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263 | path
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264 | }) => path));
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265 |
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266 | const start = _core.types.numericLiteral(paramsCount);
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267 |
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268 | const key = scope.generateUidIdentifier("key");
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269 | const len = scope.generateUidIdentifier("len");
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270 | let arrKey, arrLen;
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271 |
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272 | if (paramsCount) {
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273 | arrKey = _core.types.binaryExpression("-", _core.types.cloneNode(key), _core.types.cloneNode(start));
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274 | arrLen = _core.types.conditionalExpression(_core.types.binaryExpression(">", _core.types.cloneNode(len), _core.types.cloneNode(start)), _core.types.binaryExpression("-", _core.types.cloneNode(len), _core.types.cloneNode(start)), _core.types.numericLiteral(0));
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275 | } else {
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276 | arrKey = _core.types.identifier(key.name);
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277 | arrLen = _core.types.identifier(len.name);
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278 | }
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279 |
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280 | const loop = buildRest({
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281 | ARGUMENTS: argsId,
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282 | ARRAY_KEY: arrKey,
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283 | ARRAY_LEN: arrLen,
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284 | START: start,
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285 | ARRAY: rest,
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286 | KEY: key,
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287 | LEN: len
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288 | });
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289 |
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290 | if (state.deopted) {
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291 | node.body.body.unshift(loop);
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292 | } else {
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293 | let target = path.getEarliestCommonAncestorFrom(state.references).getStatementParent();
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294 | target.findParent(path => {
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295 | if (path.isLoop()) {
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296 | target = path;
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297 | } else {
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298 | return path.isFunction();
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299 | }
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300 | });
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301 | target.insertBefore(loop);
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302 | }
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303 |
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304 | return true;
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305 | } |
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