[6a3a178] | 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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