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authorruki <waruqi@gmail.com>2018-11-08 00:43:05 +0800
committerruki <waruqi@gmail.com>2018-11-07 22:18:30 +0800
commit89e95b3f143682ed9a006991bacf45c9dcba4818 (patch)
tree4f44cf41b828577d583890bdd5a1c31e8491a6ba /node_modules/@babel/plugin-transform-parameters/lib/rest.js
parentaa7f0199255277949790b41c56e8ec97dd4f0da4 (diff)
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Diffstat (limited to 'node_modules/@babel/plugin-transform-parameters/lib/rest.js')
-rw-r--r--node_modules/@babel/plugin-transform-parameters/lib/rest.js286
1 files changed, 0 insertions, 286 deletions
diff --git a/node_modules/@babel/plugin-transform-parameters/lib/rest.js b/node_modules/@babel/plugin-transform-parameters/lib/rest.js
deleted file mode 100644
index 82238e81..00000000
--- a/node_modules/@babel/plugin-transform-parameters/lib/rest.js
+++ /dev/null
@@ -1,286 +0,0 @@
-"use strict";
-
-Object.defineProperty(exports, "__esModule", {
- value: true
-});
-exports.default = convertFunctionRest;
-
-function _core() {
- const data = require("@babel/core");
-
- _core = function _core() {
- return data;
- };
-
- return data;
-}
-
-const buildRest = (0, _core().template)(`
- for (var LEN = ARGUMENTS.length,
- ARRAY = new Array(ARRAY_LEN),
- KEY = START;
- KEY < LEN;
- KEY++) {
- ARRAY[ARRAY_KEY] = ARGUMENTS[KEY];
- }
-`);
-const restIndex = (0, _core().template)(`
- (INDEX < OFFSET || ARGUMENTS.length <= INDEX) ? undefined : ARGUMENTS[INDEX]
-`);
-const restIndexImpure = (0, _core().template)(`
- REF = INDEX, (REF < OFFSET || ARGUMENTS.length <= REF) ? undefined : ARGUMENTS[REF]
-`);
-const restLength = (0, _core().template)(`
- ARGUMENTS.length <= OFFSET ? 0 : ARGUMENTS.length - OFFSET
-`);
-
-function referencesRest(path, state) {
- if (path.node.name === state.name) {
- return path.scope.bindingIdentifierEquals(state.name, state.outerBinding);
- }
-
- return false;
-}
-
-const memberExpressionOptimisationVisitor = {
- Scope(path, state) {
- if (!path.scope.bindingIdentifierEquals(state.name, state.outerBinding)) {
- path.skip();
- }
- },
-
- Flow(path) {
- if (path.isTypeCastExpression()) return;
- path.skip();
- },
-
- Function(path, state) {
- const oldNoOptimise = state.noOptimise;
- state.noOptimise = true;
- path.traverse(memberExpressionOptimisationVisitor, state);
- state.noOptimise = oldNoOptimise;
- path.skip();
- },
-
- ReferencedIdentifier(path, state) {
- const node = path.node;
-
- if (node.name === "arguments") {
- state.deopted = true;
- }
-
- if (!referencesRest(path, state)) return;
-
- if (state.noOptimise) {
- state.deopted = true;
- } else {
- const parentPath = path.parentPath;
-
- if (parentPath.listKey === "params" && parentPath.key < state.offset) {
- return;
- }
-
- if (parentPath.isMemberExpression({
- object: node
- })) {
- const grandparentPath = parentPath.parentPath;
- const argsOptEligible = !state.deopted && !(grandparentPath.isAssignmentExpression() && parentPath.node === grandparentPath.node.left || grandparentPath.isLVal() || grandparentPath.isForXStatement() || grandparentPath.isUpdateExpression() || grandparentPath.isUnaryExpression({
- operator: "delete"
- }) || (grandparentPath.isCallExpression() || grandparentPath.isNewExpression()) && parentPath.node === grandparentPath.node.callee);
-
- if (argsOptEligible) {
- if (parentPath.node.computed) {
- if (parentPath.get("property").isBaseType("number")) {
- state.candidates.push({
- cause: "indexGetter",
- path
- });
- return;
- }
- } else if (parentPath.node.property.name === "length") {
- state.candidates.push({
- cause: "lengthGetter",
- path
- });
- return;
- }
- }
- }
-
- if (state.offset === 0 && parentPath.isSpreadElement()) {
- const call = parentPath.parentPath;
-
- if (call.isCallExpression() && call.node.arguments.length === 1) {
- state.candidates.push({
- cause: "argSpread",
- path
- });
- return;
- }
- }
-
- state.references.push(path);
- }
- },
-
- BindingIdentifier(path, state) {
- if (referencesRest(path, state)) {
- state.deopted = true;
- }
- }
-
-};
-
-function hasRest(node) {
- const length = node.params.length;
- return length > 0 && _core().types.isRestElement(node.params[length - 1]);
-}
-
-function optimiseIndexGetter(path, argsId, offset) {
- const offsetLiteral = _core().types.numericLiteral(offset);
-
- let index;
-
- if (_core().types.isNumericLiteral(path.parent.property)) {
- index = _core().types.numericLiteral(path.parent.property.value + offset);
- } else if (offset === 0) {
- index = path.parent.property;
- } else {
- index = _core().types.binaryExpression("+", path.parent.property, _core().types.cloneNode(offsetLiteral));
- }
-
- const scope = path.scope;
-
- if (!scope.isPure(index)) {
- const temp = scope.generateUidIdentifierBasedOnNode(index);
- scope.push({
- id: temp,
- kind: "var"
- });
- path.parentPath.replaceWith(restIndexImpure({
- ARGUMENTS: argsId,
- OFFSET: offsetLiteral,
- INDEX: index,
- REF: _core().types.cloneNode(temp)
- }));
- } else {
- const parentPath = path.parentPath;
- parentPath.replaceWith(restIndex({
- ARGUMENTS: argsId,
- OFFSET: offsetLiteral,
- INDEX: index
- }));
- const offsetTestPath = parentPath.get("test").get("left");
- const valRes = offsetTestPath.evaluate();
-
- if (valRes.confident) {
- if (valRes.value === true) {
- parentPath.replaceWith(parentPath.scope.buildUndefinedNode());
- } else {
- parentPath.get("test").replaceWith(parentPath.get("test").get("right"));
- }
- }
- }
-}
-
-function optimiseLengthGetter(path, argsId, offset) {
- if (offset) {
- path.parentPath.replaceWith(restLength({
- ARGUMENTS: argsId,
- OFFSET: _core().types.numericLiteral(offset)
- }));
- } else {
- path.replaceWith(argsId);
- }
-}
-
-function convertFunctionRest(path) {
- const node = path.node,
- scope = path.scope;
- if (!hasRest(node)) return false;
- const rest = node.params.pop().argument;
-
- const argsId = _core().types.identifier("arguments");
-
- const state = {
- references: [],
- offset: node.params.length,
- argumentsNode: argsId,
- outerBinding: scope.getBindingIdentifier(rest.name),
- candidates: [],
- name: rest.name,
- deopted: false
- };
- path.traverse(memberExpressionOptimisationVisitor, state);
-
- if (!state.deopted && !state.references.length) {
- var _arr = state.candidates;
-
- for (var _i = 0; _i < _arr.length; _i++) {
- const _ref = _arr[_i];
- const path = _ref.path,
- cause = _ref.cause;
-
- const clonedArgsId = _core().types.cloneNode(argsId);
-
- switch (cause) {
- case "indexGetter":
- optimiseIndexGetter(path, clonedArgsId, state.offset);
- break;
-
- case "lengthGetter":
- optimiseLengthGetter(path, clonedArgsId, state.offset);
- break;
-
- default:
- path.replaceWith(clonedArgsId);
- }
- }
-
- return true;
- }
-
- state.references = state.references.concat(state.candidates.map(({
- path
- }) => path));
-
- const start = _core().types.numericLiteral(node.params.length);
-
- const key = scope.generateUidIdentifier("key");
- const len = scope.generateUidIdentifier("len");
- let arrKey, arrLen;
-
- if (node.params.length) {
- arrKey = _core().types.binaryExpression("-", _core().types.cloneNode(key), _core().types.cloneNode(start));
- 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));
- } else {
- arrKey = _core().types.identifier(key.name);
- arrLen = _core().types.identifier(len.name);
- }
-
- const loop = buildRest({
- ARGUMENTS: argsId,
- ARRAY_KEY: arrKey,
- ARRAY_LEN: arrLen,
- START: start,
- ARRAY: rest,
- KEY: key,
- LEN: len
- });
-
- if (state.deopted) {
- node.body.body.unshift(loop);
- } else {
- let target = path.getEarliestCommonAncestorFrom(state.references).getStatementParent();
- target.findParent(path => {
- if (path.isLoop()) {
- target = path;
- } else {
- return path.isFunction();
- }
- });
- target.insertBefore(loop);
- }
-
- return true;
-} \ No newline at end of file