mirror of https://github.com/webpack/webpack.git
1896 lines
59 KiB
JavaScript
1896 lines
59 KiB
JavaScript
/*
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MIT License http://www.opensource.org/licenses/mit-license.php
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Author Tobias Koppers @sokra
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*/
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"use strict";
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// Syntax: https://developer.mozilla.org/en/SpiderMonkey/Parser_API
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const acorn = require("acorn-dynamic-import").default;
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const Tapable = require("tapable").Tapable;
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const SyncBailHook = require("tapable").SyncBailHook;
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const HookMap = require("tapable/lib/HookMap");
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const vm = require("vm");
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const BasicEvaluatedExpression = require("./BasicEvaluatedExpression");
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const StackedSetMap = require("./util/StackedSetMap");
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const TrackingSet = require("./util/TrackingSet");
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const joinRanges = (startRange, endRange) => {
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if(!endRange) return startRange;
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if(!startRange) return endRange;
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return [startRange[0], endRange[1]];
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};
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const defaultParserOptions = {
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ranges: true,
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locations: true,
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ecmaVersion: 2017,
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sourceType: "module",
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onComment: null,
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plugins: {
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dynamicImport: true
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}
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};
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class Parser extends Tapable {
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constructor(options, sourceType = "auto") {
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super();
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this.hooks = {
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evaluateTypeof: new HookMap(() => new SyncBailHook(["expression"])),
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evaluate: new HookMap(() => new SyncBailHook(["expression"])),
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evaluateIdentifier: new HookMap(() => new SyncBailHook(["expression"])),
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evaluateDefinedIdentifier: new HookMap(() => new SyncBailHook(["expression"])),
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evaluateCallExpressionMember: new HookMap(() => new SyncBailHook(["expression", "param"])),
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statement: new SyncBailHook(["statement"]),
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statementIf: new SyncBailHook(["statement"]),
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label: new HookMap(() => new SyncBailHook(["statement"])),
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import: new SyncBailHook(["statement", "source"]),
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importSpecifier: new SyncBailHook(["statement", "source", "exportName", "identifierName"]),
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export: new SyncBailHook(["statement"]),
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exportImport: new SyncBailHook(["statement", "source"]),
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exportDeclaration: new SyncBailHook(["statement", "declaration"]),
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exportExpression: new SyncBailHook(["statement", "declaration"]),
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exportSpecifier: new SyncBailHook(["statement", "identifierName", "exportName", "index"]),
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exportImportSpecifier: new SyncBailHook(["statement", "source", "identifierName", "exportName", "index"]),
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varDeclaration: new HookMap(() => new SyncBailHook(["declaration"])),
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varDeclarationLet: new HookMap(() => new SyncBailHook(["declaration"])),
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varDeclarationConst: new HookMap(() => new SyncBailHook(["declaration"])),
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varDeclarationVar: new HookMap(() => new SyncBailHook(["declaration"])),
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canRename: new HookMap(() => new SyncBailHook(["initExpression"])),
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rename: new HookMap(() => new SyncBailHook(["initExpression"])),
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assigned: new HookMap(() => new SyncBailHook(["expression"])),
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assign: new HookMap(() => new SyncBailHook(["expression"])),
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typeof: new HookMap(() => new SyncBailHook(["expression"])),
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importCall: new SyncBailHook(["expression"]),
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call: new HookMap(() => new SyncBailHook(["expression"])),
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callAnyMember: new HookMap(() => new SyncBailHook(["expression"])),
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new: new HookMap(() => new SyncBailHook(["expression"])),
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expression: new HookMap(() => new SyncBailHook(["expression"])),
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expressionAnyMember: new HookMap(() => new SyncBailHook(["expression"])),
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expressionConditionalOperator: new SyncBailHook(["expression"]),
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program: new SyncBailHook(["ast", "comments"]),
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};
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const HOOK_MAP_COMPAT_CONFIG = {
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evaluateTypeof: /^evaluate typeof (.+)$/,
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evaluateIdentifier: /^evaluate Identifier (.+)$/,
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evaluateDefinedIdentifier: /^evaluate defined Identifier (.+)$/,
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evaluateCallExpressionMember: /^evaluate CallExpression .(.+)$/,
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evaluate: /^evaluate (.+)$/,
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label: /^label (.+)$/,
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varDeclarationLet: /^var-let (.+)$/,
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varDeclarationConst: /^var-const (.+)$/,
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varDeclarationVar: /^var-var (.+)$/,
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varDeclaration: /^var (.+)$/,
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canRename: /^can-rename (.+)$/,
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rename: /^rename (.+)$/,
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typeof: /^typeof (.+)$/,
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assigned: /^assigned (.+)$/,
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assign: /^assign (.+)$/,
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callAnyMember: /^call (.+)\.\*$/,
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call: /^call (.+)$/,
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new: /^new (.+)$/,
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expressionConditionalOperator: /^expression \?:$/,
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expressionAnyMember: /^expression (.+)\.\*$/,
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expression: /^expression (.+)$/,
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};
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this._pluginCompat.tap("Parser", options => {
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for(const name of Object.keys(HOOK_MAP_COMPAT_CONFIG)) {
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const regexp = HOOK_MAP_COMPAT_CONFIG[name];
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const match = regexp.exec(options.name);
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if(match) {
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if(match[1])
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this.hooks[name].tap(match[1], options.fn.name || "unnamed compat plugin", options.fn.bind(this));
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else
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this.hooks[name].tap(options.fn.name || "unnamed compat plugin", options.fn.bind(this));
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return true;
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}
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}
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});
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this.options = options;
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this.sourceType = sourceType;
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this.scope = undefined;
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this.state = undefined;
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this.comments = undefined;
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this.initializeEvaluating();
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}
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initializeEvaluating() {
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this.hooks.evaluate.for("Literal").tap("Parser", expr => {
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switch(typeof expr.value) {
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case "number":
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return new BasicEvaluatedExpression().setNumber(expr.value).setRange(expr.range);
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case "string":
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return new BasicEvaluatedExpression().setString(expr.value).setRange(expr.range);
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case "boolean":
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return new BasicEvaluatedExpression().setBoolean(expr.value).setRange(expr.range);
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}
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if(expr.value === null)
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return new BasicEvaluatedExpression().setNull().setRange(expr.range);
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if(expr.value instanceof RegExp)
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return new BasicEvaluatedExpression().setRegExp(expr.value).setRange(expr.range);
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});
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this.hooks.evaluate.for("LogicalExpression").tap("Parser", expr => {
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let left;
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let leftAsBool;
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let right;
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if(expr.operator === "&&") {
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left = this.evaluateExpression(expr.left);
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leftAsBool = left && left.asBool();
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if(leftAsBool === false) return left.setRange(expr.range);
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if(leftAsBool !== true) return;
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right = this.evaluateExpression(expr.right);
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return right.setRange(expr.range);
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} else if(expr.operator === "||") {
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left = this.evaluateExpression(expr.left);
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leftAsBool = left && left.asBool();
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if(leftAsBool === true) return left.setRange(expr.range);
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if(leftAsBool !== false) return;
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right = this.evaluateExpression(expr.right);
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return right.setRange(expr.range);
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}
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});
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this.hooks.evaluate.for("BinaryExpression").tap("Parser", expr => {
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let left;
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let right;
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let res;
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if(expr.operator === "+") {
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left = this.evaluateExpression(expr.left);
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right = this.evaluateExpression(expr.right);
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if(!left || !right) return;
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res = new BasicEvaluatedExpression();
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if(left.isString()) {
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if(right.isString()) {
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res.setString(left.string + right.string);
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} else if(right.isNumber()) {
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res.setString(left.string + right.number);
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} else if(right.isWrapped() && right.prefix && right.prefix.isString()) {
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res.setWrapped(
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new BasicEvaluatedExpression()
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.setString(left.string + right.prefix.string)
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.setRange(joinRanges(left.range, right.prefix.range)),
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right.postfix);
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} else if(right.isWrapped()) {
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res.setWrapped(
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new BasicEvaluatedExpression()
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.setString(left.string)
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.setRange(left.range),
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right.postfix);
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} else {
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res.setWrapped(left, null);
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}
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} else if(left.isNumber()) {
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if(right.isString()) {
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res.setString(left.number + right.string);
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} else if(right.isNumber()) {
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res.setNumber(left.number + right.number);
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}
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} else if(left.isWrapped()) {
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if(left.postfix && left.postfix.isString() && right.isString()) {
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res.setWrapped(left.prefix,
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new BasicEvaluatedExpression()
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.setString(left.postfix.string + right.string)
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.setRange(joinRanges(left.postfix.range, right.range))
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);
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} else if(left.postfix && left.postfix.isString() && right.isNumber()) {
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res.setWrapped(left.prefix,
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new BasicEvaluatedExpression()
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.setString(left.postfix.string + right.number)
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.setRange(joinRanges(left.postfix.range, right.range))
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);
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} else if(right.isString()) {
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res.setWrapped(left.prefix, right);
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} else if(right.isNumber()) {
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res.setWrapped(left.prefix,
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new BasicEvaluatedExpression()
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.setString(right.number + "")
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.setRange(right.range));
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} else {
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res.setWrapped(left.prefix, new BasicEvaluatedExpression());
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}
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} else {
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if(right.isString()) {
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res.setWrapped(null, right);
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}
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}
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res.setRange(expr.range);
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return res;
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} else if(expr.operator === "-") {
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left = this.evaluateExpression(expr.left);
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right = this.evaluateExpression(expr.right);
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if(!left || !right) return;
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if(!left.isNumber() || !right.isNumber()) return;
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res = new BasicEvaluatedExpression();
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res.setNumber(left.number - right.number);
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res.setRange(expr.range);
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return res;
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} else if(expr.operator === "*") {
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left = this.evaluateExpression(expr.left);
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right = this.evaluateExpression(expr.right);
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if(!left || !right) return;
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if(!left.isNumber() || !right.isNumber()) return;
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res = new BasicEvaluatedExpression();
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res.setNumber(left.number * right.number);
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res.setRange(expr.range);
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return res;
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} else if(expr.operator === "/") {
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left = this.evaluateExpression(expr.left);
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right = this.evaluateExpression(expr.right);
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if(!left || !right) return;
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if(!left.isNumber() || !right.isNumber()) return;
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res = new BasicEvaluatedExpression();
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res.setNumber(left.number / right.number);
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res.setRange(expr.range);
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return res;
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} else if(expr.operator === "**") {
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left = this.evaluateExpression(expr.left);
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right = this.evaluateExpression(expr.right);
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if(!left || !right) return;
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if(!left.isNumber() || !right.isNumber()) return;
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res = new BasicEvaluatedExpression();
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res.setNumber(Math.pow(left.number, right.number));
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res.setRange(expr.range);
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return res;
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} else if(expr.operator === "==" || expr.operator === "===") {
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left = this.evaluateExpression(expr.left);
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right = this.evaluateExpression(expr.right);
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if(!left || !right) return;
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res = new BasicEvaluatedExpression();
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res.setRange(expr.range);
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if(left.isString() && right.isString()) {
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return res.setBoolean(left.string === right.string);
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} else if(left.isNumber() && right.isNumber()) {
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return res.setBoolean(left.number === right.number);
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} else if(left.isBoolean() && right.isBoolean()) {
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return res.setBoolean(left.bool === right.bool);
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}
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} else if(expr.operator === "!=" || expr.operator === "!==") {
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left = this.evaluateExpression(expr.left);
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right = this.evaluateExpression(expr.right);
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if(!left || !right) return;
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res = new BasicEvaluatedExpression();
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res.setRange(expr.range);
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if(left.isString() && right.isString()) {
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return res.setBoolean(left.string !== right.string);
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} else if(left.isNumber() && right.isNumber()) {
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return res.setBoolean(left.number !== right.number);
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} else if(left.isBoolean() && right.isBoolean()) {
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return res.setBoolean(left.bool !== right.bool);
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}
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} else if(expr.operator === "&") {
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left = this.evaluateExpression(expr.left);
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right = this.evaluateExpression(expr.right);
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if(!left || !right) return;
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if(!left.isNumber() || !right.isNumber()) return;
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res = new BasicEvaluatedExpression();
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res.setNumber(left.number & right.number);
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res.setRange(expr.range);
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return res;
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} else if(expr.operator === "|") {
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left = this.evaluateExpression(expr.left);
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right = this.evaluateExpression(expr.right);
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if(!left || !right) return;
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if(!left.isNumber() || !right.isNumber()) return;
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res = new BasicEvaluatedExpression();
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res.setNumber(left.number | right.number);
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res.setRange(expr.range);
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return res;
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} else if(expr.operator === "^") {
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left = this.evaluateExpression(expr.left);
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right = this.evaluateExpression(expr.right);
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if(!left || !right) return;
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if(!left.isNumber() || !right.isNumber()) return;
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res = new BasicEvaluatedExpression();
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res.setNumber(left.number ^ right.number);
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res.setRange(expr.range);
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return res;
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} else if(expr.operator === ">>>") {
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left = this.evaluateExpression(expr.left);
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right = this.evaluateExpression(expr.right);
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if(!left || !right) return;
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if(!left.isNumber() || !right.isNumber()) return;
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res = new BasicEvaluatedExpression();
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res.setNumber(left.number >>> right.number);
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res.setRange(expr.range);
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return res;
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} else if(expr.operator === ">>") {
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left = this.evaluateExpression(expr.left);
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right = this.evaluateExpression(expr.right);
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if(!left || !right) return;
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if(!left.isNumber() || !right.isNumber()) return;
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res = new BasicEvaluatedExpression();
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res.setNumber(left.number >> right.number);
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res.setRange(expr.range);
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return res;
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} else if(expr.operator === "<<") {
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left = this.evaluateExpression(expr.left);
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right = this.evaluateExpression(expr.right);
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if(!left || !right) return;
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if(!left.isNumber() || !right.isNumber()) return;
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res = new BasicEvaluatedExpression();
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res.setNumber(left.number << right.number);
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res.setRange(expr.range);
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return res;
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}
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});
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this.hooks.evaluate.for("UnaryExpression").tap("Parser", expr => {
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if(expr.operator === "typeof") {
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let res;
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let name;
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if(expr.argument.type === "Identifier") {
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name = this.scope.renames.get(expr.argument.name) || expr.argument.name;
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if(!this.scope.definitions.has(name)) {
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const hook = this.hooks.evaluateTypeof.get(name);
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if(hook !== undefined) {
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res = hook.call(expr);
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if(res !== undefined) return res;
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}
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}
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}
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if(expr.argument.type === "MemberExpression") {
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const exprName = this.getNameForExpression(expr.argument);
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if(exprName && exprName.free) {
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const hook = this.hooks.evaluateTypeof.get(exprName.name);
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if(hook !== undefined) {
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res = hook.call(expr);
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if(res !== undefined) return res;
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}
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}
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}
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if(expr.argument.type === "FunctionExpression") {
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return new BasicEvaluatedExpression().setString("function").setRange(expr.range);
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}
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const arg = this.evaluateExpression(expr.argument);
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if(arg.isString() || arg.isWrapped()) return new BasicEvaluatedExpression().setString("string").setRange(expr.range);
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else if(arg.isNumber()) return new BasicEvaluatedExpression().setString("number").setRange(expr.range);
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else if(arg.isBoolean()) return new BasicEvaluatedExpression().setString("boolean").setRange(expr.range);
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else if(arg.isArray() || arg.isConstArray() || arg.isRegExp()) return new BasicEvaluatedExpression().setString("object").setRange(expr.range);
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} else if(expr.operator === "!") {
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const argument = this.evaluateExpression(expr.argument);
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if(!argument) return;
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if(argument.isBoolean()) {
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return new BasicEvaluatedExpression().setBoolean(!argument.bool).setRange(expr.range);
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} else if(argument.isTruthy()) {
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return new BasicEvaluatedExpression().setBoolean(false).setRange(expr.range);
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} else if(argument.isFalsy()) {
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return new BasicEvaluatedExpression().setBoolean(true).setRange(expr.range);
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} else if(argument.isString()) {
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return new BasicEvaluatedExpression().setBoolean(!argument.string).setRange(expr.range);
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} else if(argument.isNumber()) {
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return new BasicEvaluatedExpression().setBoolean(!argument.number).setRange(expr.range);
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}
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} else if(expr.operator === "~") {
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const argument = this.evaluateExpression(expr.argument);
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if(!argument) return;
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if(!argument.isNumber()) return;
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const res = new BasicEvaluatedExpression();
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res.setNumber(~argument.number);
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res.setRange(expr.range);
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return res;
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}
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});
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this.hooks.evaluateTypeof.for("undefined").tap("Parser", expr => {
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return new BasicEvaluatedExpression().setString("undefined").setRange(expr.range);
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});
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this.hooks.evaluate.for("Identifier").tap("Parser", expr => {
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const name = this.scope.renames.get(expr.name) || expr.name;
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if(!this.scope.definitions.has(expr.name)) {
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const hook = this.hooks.evaluateIdentifier.get(name);
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if(hook !== undefined) {
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const result = hook.call(expr);
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if(result) return result;
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}
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return new BasicEvaluatedExpression().setIdentifier(name).setRange(expr.range);
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} else {
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const hook = this.hooks.evaluateDefinedIdentifier.get(name);
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if(hook !== undefined) {
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return hook.call(expr);
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}
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}
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});
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this.hooks.evaluate.for("ThisExpression").tap("Parser", expr => {
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const name = this.scope.renames.get("this");
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if(name) {
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const hook = this.hooks.evaluateIdentifier.get(name);
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if(hook !== undefined) {
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const result = hook.call(expr);
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if(result) return result;
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}
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return new BasicEvaluatedExpression().setIdentifier(name).setRange(expr.range);
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}
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});
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this.hooks.evaluate.for("MemberExpression").tap("Parser", expression => {
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let exprName = this.getNameForExpression(expression);
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if(exprName) {
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if(exprName.free) {
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const hook = this.hooks.evaluateIdentifier.get(exprName.name);
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if(hook !== undefined) {
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const result = hook.call(expression);
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if(result) return result;
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}
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return new BasicEvaluatedExpression().setIdentifier(exprName.name).setRange(expression.range);
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} else {
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const hook = this.hooks.evaluateDefinedIdentifier.get(exprName.name);
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if(hook !== undefined) {
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return hook.call(expression);
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}
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}
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}
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});
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this.hooks.evaluate.for("CallExpression").tap("Parser", expr => {
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|
if(expr.callee.type !== "MemberExpression") return;
|
|
if(expr.callee.property.type !== (expr.callee.computed ? "Literal" : "Identifier")) return;
|
|
const param = this.evaluateExpression(expr.callee.object);
|
|
if(!param) return;
|
|
const property = expr.callee.property.name || expr.callee.property.value;
|
|
const hook = this.hooks.evaluateCallExpressionMember.get(property);
|
|
if(hook !== undefined) {
|
|
return hook.call(expr, param);
|
|
}
|
|
});
|
|
this.hooks.evaluateCallExpressionMember.for("replace").tap("Parser", (expr, param) => {
|
|
if(!param.isString()) return;
|
|
if(expr.arguments.length !== 2) return;
|
|
let arg1 = this.evaluateExpression(expr.arguments[0]);
|
|
let arg2 = this.evaluateExpression(expr.arguments[1]);
|
|
if(!arg1.isString() && !arg1.isRegExp()) return;
|
|
arg1 = arg1.regExp || arg1.string;
|
|
if(!arg2.isString()) return;
|
|
arg2 = arg2.string;
|
|
return new BasicEvaluatedExpression().setString(param.string.replace(arg1, arg2)).setRange(expr.range);
|
|
});
|
|
["substr", "substring"].forEach(fn => {
|
|
this.hooks.evaluateCallExpressionMember.for(fn).tap("Parser", (expr, param) => {
|
|
if(!param.isString()) return;
|
|
let arg1;
|
|
let result, str = param.string;
|
|
switch(expr.arguments.length) {
|
|
case 1:
|
|
arg1 = this.evaluateExpression(expr.arguments[0]);
|
|
if(!arg1.isNumber()) return;
|
|
result = str[fn](arg1.number);
|
|
break;
|
|
case 2:
|
|
{
|
|
arg1 = this.evaluateExpression(expr.arguments[0]);
|
|
const arg2 = this.evaluateExpression(expr.arguments[1]);
|
|
if(!arg1.isNumber()) return;
|
|
if(!arg2.isNumber()) return;
|
|
result = str[fn](arg1.number, arg2.number);
|
|
break;
|
|
}
|
|
default:
|
|
return;
|
|
}
|
|
return new BasicEvaluatedExpression().setString(result).setRange(expr.range);
|
|
});
|
|
});
|
|
|
|
/**
|
|
* @param {string} kind "cooked" | "raw"
|
|
* @param {any[]} quasis quasis
|
|
* @param {any[]} expressions expressions
|
|
* @return {BasicEvaluatedExpression[]} Simplified template
|
|
*/
|
|
const getSimplifiedTemplateResult = (kind, quasis, expressions) => {
|
|
const parts = [];
|
|
|
|
for(let i = 0; i < quasis.length; i++) {
|
|
parts.push(new BasicEvaluatedExpression().setString(quasis[i].value[kind]).setRange(quasis[i].range));
|
|
|
|
if(i > 0) {
|
|
const prevExpr = parts[parts.length - 2],
|
|
lastExpr = parts[parts.length - 1];
|
|
const expr = this.evaluateExpression(expressions[i - 1]);
|
|
if(!(expr.isString() || expr.isNumber())) continue;
|
|
|
|
prevExpr.setString(prevExpr.string + (expr.isString() ? expr.string : expr.number) + lastExpr.string);
|
|
prevExpr.setRange([prevExpr.range[0], lastExpr.range[1]]);
|
|
parts.pop();
|
|
}
|
|
}
|
|
return parts;
|
|
};
|
|
|
|
this.hooks.evaluate.for("TemplateLiteral").tap("Parser", node => {
|
|
const parts = getSimplifiedTemplateResult.call(this, "cooked", node.quasis, node.expressions);
|
|
if(parts.length === 1) {
|
|
return parts[0].setRange(node.range);
|
|
}
|
|
return new BasicEvaluatedExpression().setTemplateString(parts).setRange(node.range);
|
|
});
|
|
this.hooks.evaluate.for("TaggedTemplateExpression").tap("Parser", node => {
|
|
if(this.evaluateExpression(node.tag).identifier !== "String.raw") return;
|
|
const parts = getSimplifiedTemplateResult.call(this, "raw", node.quasi.quasis, node.quasi.expressions);
|
|
return new BasicEvaluatedExpression().setTemplateString(parts).setRange(node.range);
|
|
});
|
|
|
|
this.hooks.evaluateCallExpressionMember.for("concat").tap("Parser", (expr, param) => {
|
|
if(!param.isString() && !param.isWrapped()) return;
|
|
|
|
let stringSuffix = null;
|
|
let hasUnknownParams = false;
|
|
for(let i = expr.arguments.length - 1; i >= 0; i--) {
|
|
const argExpr = this.evaluateExpression(expr.arguments[i]);
|
|
if(!argExpr.isString() && !argExpr.isNumber()) {
|
|
hasUnknownParams = true;
|
|
break;
|
|
}
|
|
|
|
const value = argExpr.isString() ? argExpr.string : "" + argExpr.number;
|
|
|
|
const newString = value + (stringSuffix ? stringSuffix.string : "");
|
|
const newRange = [argExpr.range[0], (stringSuffix || argExpr).range[1]];
|
|
stringSuffix = new BasicEvaluatedExpression().setString(newString).setRange(newRange);
|
|
}
|
|
|
|
if(hasUnknownParams) {
|
|
const prefix = param.isString() ? param : param.prefix;
|
|
return new BasicEvaluatedExpression().setWrapped(prefix, stringSuffix).setRange(expr.range);
|
|
} else if(param.isWrapped()) {
|
|
const postfix = stringSuffix || param.postfix;
|
|
return new BasicEvaluatedExpression().setWrapped(param.prefix, postfix).setRange(expr.range);
|
|
} else {
|
|
const newString = param.string + (stringSuffix ? stringSuffix.string : "");
|
|
return new BasicEvaluatedExpression().setString(newString).setRange(expr.range);
|
|
}
|
|
});
|
|
this.hooks.evaluateCallExpressionMember.for("split").tap("Parser", (expr, param) => {
|
|
if(!param.isString()) return;
|
|
if(expr.arguments.length !== 1) return;
|
|
let result;
|
|
const arg = this.evaluateExpression(expr.arguments[0]);
|
|
if(arg.isString()) {
|
|
result = param.string.split(arg.string);
|
|
} else if(arg.isRegExp()) {
|
|
result = param.string.split(arg.regExp);
|
|
} else return;
|
|
return new BasicEvaluatedExpression().setArray(result).setRange(expr.range);
|
|
});
|
|
this.hooks.evaluate.for("ConditionalExpression").tap("Parser", expr => {
|
|
const condition = this.evaluateExpression(expr.test);
|
|
const conditionValue = condition.asBool();
|
|
let res;
|
|
if(conditionValue === undefined) {
|
|
const consequent = this.evaluateExpression(expr.consequent);
|
|
const alternate = this.evaluateExpression(expr.alternate);
|
|
if(!consequent || !alternate) return;
|
|
res = new BasicEvaluatedExpression();
|
|
if(consequent.isConditional())
|
|
res.setOptions(consequent.options);
|
|
else
|
|
res.setOptions([consequent]);
|
|
if(alternate.isConditional())
|
|
res.addOptions(alternate.options);
|
|
else
|
|
res.addOptions([alternate]);
|
|
} else {
|
|
res = this.evaluateExpression(conditionValue ? expr.consequent : expr.alternate);
|
|
}
|
|
res.setRange(expr.range);
|
|
return res;
|
|
});
|
|
this.hooks.evaluate.for("ArrayExpression").tap("Parser", expr => {
|
|
const items = expr.elements.map(element => {
|
|
return element !== null && this.evaluateExpression(element);
|
|
});
|
|
if(!items.every(Boolean)) return;
|
|
return new BasicEvaluatedExpression().setItems(items).setRange(expr.range);
|
|
});
|
|
}
|
|
|
|
getRenameIdentifier(expr) {
|
|
const result = this.evaluateExpression(expr);
|
|
if(!result) return;
|
|
if(result.isIdentifier()) return result.identifier;
|
|
return;
|
|
}
|
|
|
|
walkClass(classy) {
|
|
if(classy.superClass)
|
|
this.walkExpression(classy.superClass);
|
|
if(classy.body && classy.body.type === "ClassBody") {
|
|
const wasTopLevel = this.scope.topLevelScope;
|
|
this.scope.topLevelScope = false;
|
|
for(const methodDefinition of classy.body.body) {
|
|
if(methodDefinition.type === "MethodDefinition")
|
|
this.walkMethodDefinition(methodDefinition);
|
|
}
|
|
this.scope.topLevelScope = wasTopLevel;
|
|
}
|
|
}
|
|
|
|
walkMethodDefinition(methodDefinition) {
|
|
if(methodDefinition.computed && methodDefinition.key)
|
|
this.walkExpression(methodDefinition.key);
|
|
if(methodDefinition.value)
|
|
this.walkExpression(methodDefinition.value);
|
|
}
|
|
|
|
// Prewalking iterates the scope for variable declarations
|
|
prewalkStatements(statements) {
|
|
for(let index = 0, len = statements.length; index < len; index++) {
|
|
const statement = statements[index];
|
|
this.prewalkStatement(statement);
|
|
}
|
|
}
|
|
|
|
// Walking iterates the statements and expressions and processes them
|
|
walkStatements(statements) {
|
|
for(let index = 0, len = statements.length; index < len; index++) {
|
|
const statement = statements[index];
|
|
this.walkStatement(statement);
|
|
}
|
|
}
|
|
|
|
prewalkStatement(statement) {
|
|
switch(statement.type) {
|
|
case "BlockStatement":
|
|
this.prewalkBlockStatement(statement);
|
|
break;
|
|
case "ClassDeclaration":
|
|
this.prewalkClassDeclaration(statement);
|
|
break;
|
|
case "DoWhileStatement":
|
|
this.prewalkDoWhileStatement(statement);
|
|
break;
|
|
case "ExportAllDeclaration":
|
|
this.prewalkExportAllDeclaration(statement);
|
|
break;
|
|
case "ExportDefaultDeclaration":
|
|
this.prewalkExportDefaultDeclaration(statement);
|
|
break;
|
|
case "ExportNamedDeclaration":
|
|
this.prewalkExportNamedDeclaration(statement);
|
|
break;
|
|
case "ForInStatement":
|
|
this.prewalkForInStatement(statement);
|
|
break;
|
|
case "ForOfStatement":
|
|
this.prewalkForOfStatement(statement);
|
|
break;
|
|
case "ForStatement":
|
|
this.prewalkForStatement(statement);
|
|
break;
|
|
case "FunctionDeclaration":
|
|
this.prewalkFunctionDeclaration(statement);
|
|
break;
|
|
case "IfStatement":
|
|
this.prewalkIfStatement(statement);
|
|
break;
|
|
case "ImportDeclaration":
|
|
this.prewalkImportDeclaration(statement);
|
|
break;
|
|
case "LabeledStatement":
|
|
this.prewalkLabeledStatement(statement);
|
|
break;
|
|
case "SwitchStatement":
|
|
this.prewalkSwitchStatement(statement);
|
|
break;
|
|
case "TryStatement":
|
|
this.prewalkTryStatement(statement);
|
|
break;
|
|
case "VariableDeclaration":
|
|
this.prewalkVariableDeclaration(statement);
|
|
break;
|
|
case "WhileStatement":
|
|
this.prewalkWhileStatement(statement);
|
|
break;
|
|
case "WithStatement":
|
|
this.prewalkWithStatement(statement);
|
|
break;
|
|
}
|
|
}
|
|
|
|
walkStatement(statement) {
|
|
if(this.hooks.statement.call(statement) !== undefined) return;
|
|
switch(statement.type) {
|
|
case "BlockStatement":
|
|
this.walkBlockStatement(statement);
|
|
break;
|
|
case "ClassDeclaration":
|
|
this.walkClassDeclaration(statement);
|
|
break;
|
|
case "DoWhileStatement":
|
|
this.walkDoWhileStatement(statement);
|
|
break;
|
|
case "ExportDefaultDeclaration":
|
|
this.walkExportDefaultDeclaration(statement);
|
|
break;
|
|
case "ExportNamedDeclaration":
|
|
this.walkExportNamedDeclaration(statement);
|
|
break;
|
|
case "ExpressionStatement":
|
|
this.walkExpressionStatement(statement);
|
|
break;
|
|
case "ForInStatement":
|
|
this.walkForInStatement(statement);
|
|
break;
|
|
case "ForOfStatement":
|
|
this.walkForOfStatement(statement);
|
|
break;
|
|
case "ForStatement":
|
|
this.walkForStatement(statement);
|
|
break;
|
|
case "FunctionDeclaration":
|
|
this.walkFunctionDeclaration(statement);
|
|
break;
|
|
case "IfStatement":
|
|
this.walkIfStatement(statement);
|
|
break;
|
|
case "LabeledStatement":
|
|
this.walkLabeledStatement(statement);
|
|
break;
|
|
case "ReturnStatement":
|
|
this.walkReturnStatement(statement);
|
|
break;
|
|
case "SwitchStatement":
|
|
this.walkSwitchStatement(statement);
|
|
break;
|
|
case "ThrowStatement":
|
|
this.walkThrowStatement(statement);
|
|
break;
|
|
case "TryStatement":
|
|
this.walkTryStatement(statement);
|
|
break;
|
|
case "VariableDeclaration":
|
|
this.walkVariableDeclaration(statement);
|
|
break;
|
|
case "WhileStatement":
|
|
this.walkWhileStatement(statement);
|
|
break;
|
|
case "WithStatement":
|
|
this.walkWithStatement(statement);
|
|
break;
|
|
}
|
|
}
|
|
|
|
// Real Statements
|
|
prewalkBlockStatement(statement) {
|
|
this.prewalkStatements(statement.body);
|
|
}
|
|
|
|
walkBlockStatement(statement) {
|
|
this.walkStatements(statement.body);
|
|
}
|
|
|
|
walkExpressionStatement(statement) {
|
|
this.walkExpression(statement.expression);
|
|
}
|
|
|
|
prewalkIfStatement(statement) {
|
|
this.prewalkStatement(statement.consequent);
|
|
if(statement.alternate)
|
|
this.prewalkStatement(statement.alternate);
|
|
}
|
|
|
|
walkIfStatement(statement) {
|
|
const result = this.hooks.statementIf.call(statement);
|
|
if(result === undefined) {
|
|
this.walkExpression(statement.test);
|
|
this.walkStatement(statement.consequent);
|
|
if(statement.alternate)
|
|
this.walkStatement(statement.alternate);
|
|
} else {
|
|
if(result)
|
|
this.walkStatement(statement.consequent);
|
|
else if(statement.alternate)
|
|
this.walkStatement(statement.alternate);
|
|
}
|
|
}
|
|
|
|
prewalkLabeledStatement(statement) {
|
|
this.prewalkStatement(statement.body);
|
|
}
|
|
|
|
walkLabeledStatement(statement) {
|
|
const hook = this.hooks.label.get(statement.label.name);
|
|
if(hook !== undefined) {
|
|
const result = hook.call(statement);
|
|
if(result === true)
|
|
return;
|
|
}
|
|
this.walkStatement(statement.body);
|
|
}
|
|
|
|
prewalkWithStatement(statement) {
|
|
this.prewalkStatement(statement.body);
|
|
}
|
|
|
|
walkWithStatement(statement) {
|
|
this.walkExpression(statement.object);
|
|
this.walkStatement(statement.body);
|
|
}
|
|
|
|
prewalkSwitchStatement(statement) {
|
|
this.prewalkSwitchCases(statement.cases);
|
|
}
|
|
|
|
walkSwitchStatement(statement) {
|
|
this.walkExpression(statement.discriminant);
|
|
this.walkSwitchCases(statement.cases);
|
|
}
|
|
|
|
walkTerminatingStatement(statement) {
|
|
if(statement.argument)
|
|
this.walkExpression(statement.argument);
|
|
}
|
|
|
|
walkReturnStatement(statement) {
|
|
this.walkTerminatingStatement(statement);
|
|
}
|
|
|
|
walkThrowStatement(statement) {
|
|
this.walkTerminatingStatement(statement);
|
|
}
|
|
|
|
prewalkTryStatement(statement) {
|
|
this.prewalkStatement(statement.block);
|
|
}
|
|
|
|
walkTryStatement(statement) {
|
|
if(this.scope.inTry) {
|
|
this.walkStatement(statement.block);
|
|
} else {
|
|
this.scope.inTry = true;
|
|
this.walkStatement(statement.block);
|
|
this.scope.inTry = false;
|
|
}
|
|
if(statement.handler)
|
|
this.walkCatchClause(statement.handler);
|
|
if(statement.finalizer)
|
|
this.walkStatement(statement.finalizer);
|
|
}
|
|
|
|
prewalkWhileStatement(statement) {
|
|
this.prewalkStatement(statement.body);
|
|
}
|
|
|
|
walkWhileStatement(statement) {
|
|
this.walkExpression(statement.test);
|
|
this.walkStatement(statement.body);
|
|
}
|
|
|
|
prewalkDoWhileStatement(statement) {
|
|
this.prewalkStatement(statement.body);
|
|
}
|
|
|
|
walkDoWhileStatement(statement) {
|
|
this.walkStatement(statement.body);
|
|
this.walkExpression(statement.test);
|
|
}
|
|
|
|
prewalkForStatement(statement) {
|
|
if(statement.init) {
|
|
if(statement.init.type === "VariableDeclaration")
|
|
this.prewalkStatement(statement.init);
|
|
}
|
|
this.prewalkStatement(statement.body);
|
|
}
|
|
|
|
walkForStatement(statement) {
|
|
if(statement.init) {
|
|
if(statement.init.type === "VariableDeclaration")
|
|
this.walkStatement(statement.init);
|
|
else
|
|
this.walkExpression(statement.init);
|
|
}
|
|
if(statement.test)
|
|
this.walkExpression(statement.test);
|
|
if(statement.update)
|
|
this.walkExpression(statement.update);
|
|
this.walkStatement(statement.body);
|
|
}
|
|
|
|
prewalkForInStatement(statement) {
|
|
if(statement.left.type === "VariableDeclaration")
|
|
this.prewalkVariableDeclaration(statement.left);
|
|
this.prewalkStatement(statement.body);
|
|
}
|
|
|
|
walkForInStatement(statement) {
|
|
if(statement.left.type === "VariableDeclaration")
|
|
this.walkVariableDeclaration(statement.left);
|
|
else
|
|
this.walkPattern(statement.left);
|
|
this.walkExpression(statement.right);
|
|
this.walkStatement(statement.body);
|
|
}
|
|
|
|
prewalkForOfStatement(statement) {
|
|
if(statement.left.type === "VariableDeclaration")
|
|
this.prewalkVariableDeclaration(statement.left);
|
|
this.prewalkStatement(statement.body);
|
|
}
|
|
|
|
walkForOfStatement(statement) {
|
|
if(statement.left.type === "VariableDeclaration")
|
|
this.walkVariableDeclaration(statement.left);
|
|
else
|
|
this.walkPattern(statement.left);
|
|
this.walkExpression(statement.right);
|
|
this.walkStatement(statement.body);
|
|
}
|
|
|
|
// Declarations
|
|
prewalkFunctionDeclaration(statement) {
|
|
if(statement.id) {
|
|
this.scope.renames.set(statement.id.name, null);
|
|
this.scope.definitions.add(statement.id.name);
|
|
}
|
|
}
|
|
|
|
walkFunctionDeclaration(statement) {
|
|
for(const param of statement.params)
|
|
this.walkPattern(param);
|
|
this.inScope(statement.params, () => {
|
|
this.scope.topLevelScope = false;
|
|
if(statement.body.type === "BlockStatement") {
|
|
this.detectStrictMode(statement.body.body);
|
|
this.prewalkStatement(statement.body);
|
|
this.walkStatement(statement.body);
|
|
} else {
|
|
this.walkExpression(statement.body);
|
|
}
|
|
});
|
|
}
|
|
|
|
prewalkImportDeclaration(statement) {
|
|
const source = statement.source.value;
|
|
this.hooks.import.call(statement, source);
|
|
for(const specifier of statement.specifiers) {
|
|
const name = specifier.local.name;
|
|
this.scope.renames.set(name, null);
|
|
this.scope.definitions.add(name);
|
|
switch(specifier.type) {
|
|
case "ImportDefaultSpecifier":
|
|
this.hooks.importSpecifier.call(statement, source, "default", name);
|
|
break;
|
|
case "ImportSpecifier":
|
|
this.hooks.importSpecifier.call(statement, source, specifier.imported.name, name);
|
|
break;
|
|
case "ImportNamespaceSpecifier":
|
|
this.hooks.importSpecifier.call(statement, source, null, name);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
prewalkExportNamedDeclaration(statement) {
|
|
let source;
|
|
if(statement.source) {
|
|
source = statement.source.value;
|
|
this.hooks.exportImport.call(statement, source);
|
|
} else {
|
|
this.hooks.export.call(statement);
|
|
}
|
|
if(statement.declaration) {
|
|
if(!this.hooks.exportDeclaration.call(statement, statement.declaration)) {
|
|
const originalDefinitions = this.scope.definitions;
|
|
const tracker = new TrackingSet(this.scope.definitions);
|
|
this.scope.definitions = tracker;
|
|
this.prewalkStatement(statement.declaration);
|
|
const newDefs = Array.from(tracker.getAddedItems());
|
|
this.scope.definitions = originalDefinitions;
|
|
for(let index = newDefs.length - 1; index >= 0; index--) {
|
|
const def = newDefs[index];
|
|
this.hooks.exportSpecifier.call(statement, def, def, index);
|
|
}
|
|
}
|
|
}
|
|
if(statement.specifiers) {
|
|
for(let specifierIndex = 0; specifierIndex < statement.specifiers.length; specifierIndex++) {
|
|
const specifier = statement.specifiers[specifierIndex];
|
|
switch(specifier.type) {
|
|
case "ExportSpecifier":
|
|
{
|
|
const name = specifier.exported.name;
|
|
if(source)
|
|
this.hooks.exportImportSpecifier.call(statement, source, specifier.local.name, name, specifierIndex);
|
|
else
|
|
this.hooks.exportSpecifier.call(statement, specifier.local.name, name, specifierIndex);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
walkExportNamedDeclaration(statement) {
|
|
if(statement.declaration) {
|
|
this.walkStatement(statement.declaration);
|
|
}
|
|
}
|
|
|
|
prewalkExportDefaultDeclaration(statement) {
|
|
if(statement.declaration.id) {
|
|
const originalDefinitions = this.scope.definitions;
|
|
const tracker = new TrackingSet(this.scope.definitions);
|
|
this.scope.definitions = tracker;
|
|
this.prewalkStatement(statement.declaration);
|
|
const newDefs = Array.from(tracker.getAddedItems());
|
|
this.scope.definitions = originalDefinitions;
|
|
for(let index = 0, len = newDefs.length; index < len; index++) {
|
|
const def = newDefs[index];
|
|
this.hooks.exportSpecifier.call(statement, def, "default");
|
|
}
|
|
}
|
|
}
|
|
|
|
walkExportDefaultDeclaration(statement) {
|
|
this.hooks.export.call(statement);
|
|
if(statement.declaration.id) {
|
|
if(!this.hooks.exportDeclaration.call(statement, statement.declaration)) {
|
|
this.walkStatement(statement.declaration);
|
|
}
|
|
} else {
|
|
// Acorn parses `export default function() {}` as `FunctionDeclaration` and
|
|
// `export default class {}` as `ClassDeclaration`, both with `id = null`.
|
|
// These nodes must be treated as expressions.
|
|
if(statement.declaration.type === "FunctionDeclaration") {
|
|
this.walkFunctionDeclaration(statement.declaration);
|
|
} else if(statement.declaration.type === "ClassDeclaration") {
|
|
this.walkClassDeclaration(statement.declaration);
|
|
} else {
|
|
this.walkExpression(statement.declaration);
|
|
}
|
|
if(!this.hooks.exportExpression.call(statement, statement.declaration)) {
|
|
this.hooks.exportSpecifier.call(statement, statement.declaration, "default");
|
|
}
|
|
}
|
|
}
|
|
|
|
prewalkExportAllDeclaration(statement) {
|
|
const source = statement.source.value;
|
|
this.hooks.exportImport.call(statement, source);
|
|
this.hooks.exportImportSpecifier.call(statement, source, null, null, 0);
|
|
}
|
|
|
|
prewalkVariableDeclaration(statement) {
|
|
const hookMap = statement.kind === "const" ? this.hooks.varDeclarationConst :
|
|
statement.kind === "let" ? this.hooks.varDeclarationLet :
|
|
this.hooks.varDeclarationVar;
|
|
for(const declarator of statement.declarations) {
|
|
switch(declarator.type) {
|
|
case "VariableDeclarator":
|
|
{
|
|
this.enterPattern(declarator.id, (name, decl) => {
|
|
let hook = hookMap.get(name);
|
|
if(hook === undefined || !hook.call(decl)) {
|
|
hook = this.hooks.varDeclaration.get(name);
|
|
if(hook === undefined || !hook.call(decl)) {
|
|
this.scope.renames.set(name, null);
|
|
this.scope.definitions.add(name);
|
|
}
|
|
}
|
|
});
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
walkVariableDeclaration(statement) {
|
|
for(const declarator of statement.declarations) {
|
|
switch(declarator.type) {
|
|
case "VariableDeclarator":
|
|
{
|
|
const renameIdentifier = declarator.init && this.getRenameIdentifier(declarator.init);
|
|
if(renameIdentifier && declarator.id.type === "Identifier") {
|
|
const hook = this.hooks.canRename.get(renameIdentifier);
|
|
if(hook !== undefined && hook.call(declarator.init)) {
|
|
// renaming with "var a = b;"
|
|
const hook = this.hooks.rename.get(renameIdentifier);
|
|
if(hook === undefined || !hook.call(declarator.init)) {
|
|
this.scope.renames.set(declarator.id.name, this.scope.renames.get(renameIdentifier) || renameIdentifier);
|
|
this.scope.definitions.delete(declarator.id.name);
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
this.walkPattern(declarator.id);
|
|
if(declarator.init)
|
|
this.walkExpression(declarator.init);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
prewalkClassDeclaration(statement) {
|
|
if(statement.id) {
|
|
this.scope.renames.set(statement.id.name, null);
|
|
this.scope.definitions.add(statement.id.name);
|
|
}
|
|
}
|
|
|
|
walkClassDeclaration(statement) {
|
|
this.walkClass(statement);
|
|
}
|
|
|
|
prewalkSwitchCases(switchCases) {
|
|
for(let index = 0, len = switchCases.length; index < len; index++) {
|
|
const switchCase = switchCases[index];
|
|
this.prewalkStatements(switchCase.consequent);
|
|
}
|
|
}
|
|
|
|
walkSwitchCases(switchCases) {
|
|
for(let index = 0, len = switchCases.length; index < len; index++) {
|
|
const switchCase = switchCases[index];
|
|
|
|
if(switchCase.test) {
|
|
this.walkExpression(switchCase.test);
|
|
}
|
|
this.walkStatements(switchCase.consequent);
|
|
}
|
|
}
|
|
|
|
walkCatchClause(catchClause) {
|
|
this.inScope([catchClause.param], () => {
|
|
this.prewalkStatement(catchClause.body);
|
|
this.walkStatement(catchClause.body);
|
|
});
|
|
}
|
|
|
|
walkPattern(pattern) {
|
|
switch(pattern.type) {
|
|
case "ArrayPattern":
|
|
this.walkArrayPattern(pattern);
|
|
break;
|
|
case "AssignmentPattern":
|
|
this.walkAssignmentPattern(pattern);
|
|
break;
|
|
case "MemberExpression":
|
|
this.walkMemberExpression(pattern);
|
|
break;
|
|
case "ObjectPattern":
|
|
this.walkObjectPattern(pattern);
|
|
break;
|
|
case "RestElement":
|
|
this.walkRestElement(pattern);
|
|
break;
|
|
}
|
|
}
|
|
|
|
walkAssignmentPattern(pattern) {
|
|
this.walkExpression(pattern.right);
|
|
this.walkPattern(pattern.left);
|
|
}
|
|
|
|
walkObjectPattern(pattern) {
|
|
for(let i = 0, len = pattern.properties.length; i < len; i++) {
|
|
const prop = pattern.properties[i];
|
|
if(prop) {
|
|
if(prop.computed)
|
|
this.walkExpression(prop.key);
|
|
if(prop.value)
|
|
this.walkPattern(prop.value);
|
|
}
|
|
}
|
|
}
|
|
|
|
walkArrayPattern(pattern) {
|
|
for(let i = 0, len = pattern.elements.length; i < len; i++) {
|
|
const element = pattern.elements[i];
|
|
if(element)
|
|
this.walkPattern(element);
|
|
}
|
|
}
|
|
|
|
walkRestElement(pattern) {
|
|
this.walkPattern(pattern.argument);
|
|
}
|
|
|
|
walkExpressions(expressions) {
|
|
for(let expressionsIndex = 0, len = expressions.length; expressionsIndex < len; expressionsIndex++) {
|
|
const expression = expressions[expressionsIndex];
|
|
if(expression)
|
|
this.walkExpression(expression);
|
|
}
|
|
}
|
|
|
|
walkExpression(expression) {
|
|
switch(expression.type) {
|
|
case "ArrayExpression":
|
|
this.walkArrayExpression(expression);
|
|
break;
|
|
case "ArrowFunctionExpression":
|
|
this.walkArrowFunctionExpression(expression);
|
|
break;
|
|
case "AssignmentExpression":
|
|
this.walkAssignmentExpression(expression);
|
|
break;
|
|
case "AwaitExpression":
|
|
this.walkAwaitExpression(expression);
|
|
break;
|
|
case "BinaryExpression":
|
|
this.walkBinaryExpression(expression);
|
|
break;
|
|
case "CallExpression":
|
|
this.walkCallExpression(expression);
|
|
break;
|
|
case "ClassExpression":
|
|
this.walkClassExpression(expression);
|
|
break;
|
|
case "ConditionalExpression":
|
|
this.walkConditionalExpression(expression);
|
|
break;
|
|
case "FunctionExpression":
|
|
this.walkFunctionExpression(expression);
|
|
break;
|
|
case "Identifier":
|
|
this.walkIdentifier(expression);
|
|
break;
|
|
case "LogicalExpression":
|
|
this.walkLogicalExpression(expression);
|
|
break;
|
|
case "MemberExpression":
|
|
this.walkMemberExpression(expression);
|
|
break;
|
|
case "NewExpression":
|
|
this.walkNewExpression(expression);
|
|
break;
|
|
case "ObjectExpression":
|
|
this.walkObjectExpression(expression);
|
|
break;
|
|
case "SequenceExpression":
|
|
this.walkSequenceExpression(expression);
|
|
break;
|
|
case "SpreadElement":
|
|
this.walkSpreadElement(expression);
|
|
break;
|
|
case "TaggedTemplateExpression":
|
|
this.walkTaggedTemplateExpression(expression);
|
|
break;
|
|
case "TemplateLiteral":
|
|
this.walkTemplateLiteral(expression);
|
|
break;
|
|
case "ThisExpression":
|
|
this.walkThisExpression(expression);
|
|
break;
|
|
case "UnaryExpression":
|
|
this.walkUnaryExpression(expression);
|
|
break;
|
|
case "UpdateExpression":
|
|
this.walkUpdateExpression(expression);
|
|
break;
|
|
case "YieldExpression":
|
|
this.walkYieldExpression(expression);
|
|
break;
|
|
}
|
|
}
|
|
|
|
walkAwaitExpression(expression) {
|
|
this.walkExpression(expression.argument);
|
|
}
|
|
|
|
walkArrayExpression(expression) {
|
|
if(expression.elements)
|
|
this.walkExpressions(expression.elements);
|
|
}
|
|
|
|
walkSpreadElement(expression) {
|
|
if(expression.argument)
|
|
this.walkExpression(expression.argument);
|
|
}
|
|
|
|
walkObjectExpression(expression) {
|
|
for(let propIndex = 0, len = expression.properties.length; propIndex < len; propIndex++) {
|
|
const prop = expression.properties[propIndex];
|
|
if(prop.computed)
|
|
this.walkExpression(prop.key);
|
|
if(prop.shorthand)
|
|
this.scope.inShorthand = true;
|
|
this.walkExpression(prop.value);
|
|
if(prop.shorthand)
|
|
this.scope.inShorthand = false;
|
|
}
|
|
}
|
|
|
|
walkFunctionExpression(expression) {
|
|
for(const param of expression.params)
|
|
this.walkPattern(param);
|
|
this.inScope(expression.params, () => {
|
|
this.scope.topLevelScope = false;
|
|
if(expression.body.type === "BlockStatement") {
|
|
this.detectStrictMode(expression.body.body);
|
|
this.prewalkStatement(expression.body);
|
|
this.walkStatement(expression.body);
|
|
} else {
|
|
this.walkExpression(expression.body);
|
|
}
|
|
});
|
|
}
|
|
|
|
walkArrowFunctionExpression(expression) {
|
|
for(const param of expression.params)
|
|
this.walkPattern(param);
|
|
this.inScope(expression.params, () => {
|
|
if(expression.body.type === "BlockStatement") {
|
|
this.detectStrictMode(expression.body.body);
|
|
this.prewalkStatement(expression.body);
|
|
this.walkStatement(expression.body);
|
|
} else {
|
|
this.walkExpression(expression.body);
|
|
}
|
|
});
|
|
}
|
|
|
|
walkSequenceExpression(expression) {
|
|
if(expression.expressions)
|
|
this.walkExpressions(expression.expressions);
|
|
}
|
|
|
|
walkUpdateExpression(expression) {
|
|
this.walkExpression(expression.argument);
|
|
}
|
|
|
|
walkUnaryExpression(expression) {
|
|
if(expression.operator === "typeof") {
|
|
const exprName = this.getNameForExpression(expression.argument);
|
|
if(exprName && exprName.free) {
|
|
const hook = this.hooks.typeof.get(exprName.name);
|
|
if(hook !== undefined) {
|
|
const result = hook.call(expression);
|
|
if(result === true)
|
|
return;
|
|
}
|
|
}
|
|
}
|
|
this.walkExpression(expression.argument);
|
|
}
|
|
|
|
walkLeftRightExpression(expression) {
|
|
this.walkExpression(expression.left);
|
|
this.walkExpression(expression.right);
|
|
}
|
|
|
|
walkBinaryExpression(expression) {
|
|
this.walkLeftRightExpression(expression);
|
|
}
|
|
|
|
walkLogicalExpression(expression) {
|
|
this.walkLeftRightExpression(expression);
|
|
}
|
|
|
|
walkAssignmentExpression(expression) {
|
|
const renameIdentifier = this.getRenameIdentifier(expression.right);
|
|
if(expression.left.type === "Identifier" && renameIdentifier) {
|
|
const hook = this.hooks.canRename.get(renameIdentifier);
|
|
if(hook !== undefined && hook.call(expression.right)) {
|
|
// renaming "a = b;"
|
|
const hook = this.hooks.rename.get(renameIdentifier);
|
|
if(hook === undefined || !hook.call(expression.right)) {
|
|
this.scope.renames.set(expression.left.name, renameIdentifier);
|
|
this.scope.definitions.delete(expression.left.name);
|
|
}
|
|
return;
|
|
}
|
|
}
|
|
if(expression.left.type === "Identifier") {
|
|
const assignedHook = this.hooks.assigned.get(expression.left.name);
|
|
if(assignedHook === undefined || !assignedHook.call(expression)) {
|
|
this.walkExpression(expression.right);
|
|
}
|
|
this.scope.renames.set(expression.left.name, null);
|
|
const assignHook = this.hooks.assign.get(expression.left.name);
|
|
if(assignHook === undefined || !assignHook.call(expression)) {
|
|
this.walkExpression(expression.left);
|
|
}
|
|
return;
|
|
}
|
|
this.walkExpression(expression.right);
|
|
this.walkPattern(expression.left);
|
|
this.enterPattern(expression.left, (name, decl) => {
|
|
this.scope.renames.set(name, null);
|
|
});
|
|
}
|
|
|
|
walkConditionalExpression(expression) {
|
|
const result = this.hooks.expressionConditionalOperator.call(expression);
|
|
if(result === undefined) {
|
|
this.walkExpression(expression.test);
|
|
this.walkExpression(expression.consequent);
|
|
if(expression.alternate)
|
|
this.walkExpression(expression.alternate);
|
|
} else {
|
|
if(result)
|
|
this.walkExpression(expression.consequent);
|
|
else if(expression.alternate)
|
|
this.walkExpression(expression.alternate);
|
|
}
|
|
}
|
|
|
|
walkNewExpression(expression) {
|
|
const callee = this.evaluateExpression(expression.callee);
|
|
if(callee.isIdentifier()) {
|
|
const hook = this.hooks.new.get(callee.identifier);
|
|
if(hook !== undefined) {
|
|
const result = hook.call(expression);
|
|
if(result === true) {
|
|
return;
|
|
}
|
|
}
|
|
}
|
|
|
|
this.walkExpression(expression.callee);
|
|
if(expression.arguments)
|
|
this.walkExpressions(expression.arguments);
|
|
}
|
|
|
|
walkYieldExpression(expression) {
|
|
if(expression.argument)
|
|
this.walkExpression(expression.argument);
|
|
}
|
|
|
|
walkTemplateLiteral(expression) {
|
|
if(expression.expressions)
|
|
this.walkExpressions(expression.expressions);
|
|
}
|
|
|
|
walkTaggedTemplateExpression(expression) {
|
|
if(expression.tag)
|
|
this.walkExpression(expression.tag);
|
|
if(expression.quasi && expression.quasi.expressions)
|
|
this.walkExpressions(expression.quasi.expressions);
|
|
}
|
|
|
|
walkClassExpression(expression) {
|
|
this.walkClass(expression);
|
|
}
|
|
|
|
walkCallExpression(expression) {
|
|
let result;
|
|
|
|
const walkIIFE = (functionExpression, options, currentThis) => {
|
|
const renameArgOrThis = argOrThis => {
|
|
const renameIdentifier = this.getRenameIdentifier(argOrThis);
|
|
if(renameIdentifier) {
|
|
const hook = this.hooks.canRename.get(renameIdentifier);
|
|
if(hook !== undefined && hook.call(argOrThis)) {
|
|
const hook = this.hooks.rename.get(renameIdentifier);
|
|
if(hook === undefined || !hook.call(argOrThis))
|
|
return renameIdentifier;
|
|
}
|
|
}
|
|
this.walkExpression(argOrThis);
|
|
};
|
|
const params = functionExpression.params;
|
|
const renameThis = currentThis ? renameArgOrThis.call(this, currentThis) : null;
|
|
const args = options.map(renameArgOrThis);
|
|
this.inScope(params.filter((identifier, idx) => !args[idx]), () => {
|
|
if(renameThis) {
|
|
this.scope.renames.set("this", renameThis);
|
|
}
|
|
for(let i = 0; i < args.length; i++) {
|
|
const param = args[i];
|
|
if(!param) continue;
|
|
if(!params[i] || params[i].type !== "Identifier") continue;
|
|
this.scope.renames.set(params[i].name, param);
|
|
}
|
|
if(functionExpression.body.type === "BlockStatement") {
|
|
this.prewalkStatement(functionExpression.body);
|
|
this.walkStatement(functionExpression.body);
|
|
} else
|
|
this.walkExpression(functionExpression.body);
|
|
});
|
|
};
|
|
if(expression.callee.type === "MemberExpression" &&
|
|
expression.callee.object.type === "FunctionExpression" &&
|
|
!expression.callee.computed &&
|
|
(expression.callee.property.name === "call" || expression.callee.property.name === "bind") &&
|
|
expression.arguments &&
|
|
expression.arguments.length > 0
|
|
) {
|
|
// (function(...) { }.call/bind(?, ...))
|
|
walkIIFE.call(this, expression.callee.object, expression.arguments.slice(1), expression.arguments[0]);
|
|
} else if(expression.callee.type === "FunctionExpression" && expression.arguments) {
|
|
// (function(...) { }(...))
|
|
walkIIFE.call(this, expression.callee, expression.arguments);
|
|
} else if(expression.callee.type === "Import") {
|
|
result = this.hooks.importCall.call(expression);
|
|
if(result === true)
|
|
return;
|
|
|
|
if(expression.arguments)
|
|
this.walkExpressions(expression.arguments);
|
|
} else {
|
|
|
|
const callee = this.evaluateExpression(expression.callee);
|
|
if(callee.isIdentifier()) {
|
|
const callHook = this.hooks.call.get(callee.identifier);
|
|
if(callHook !== undefined) {
|
|
result = callHook.call(expression);
|
|
if(result === true)
|
|
return;
|
|
}
|
|
let identifier = callee.identifier.replace(/\.[^.]+$/, "");
|
|
if(identifier !== callee.identifier) {
|
|
const callAnyHook = this.hooks.callAnyMember.get(identifier);
|
|
if(callAnyHook !== undefined) {
|
|
result = callAnyHook.call(expression);
|
|
if(result === true)
|
|
return;
|
|
}
|
|
}
|
|
}
|
|
|
|
if(expression.callee)
|
|
this.walkExpression(expression.callee);
|
|
if(expression.arguments)
|
|
this.walkExpressions(expression.arguments);
|
|
}
|
|
}
|
|
|
|
walkMemberExpression(expression) {
|
|
const exprName = this.getNameForExpression(expression);
|
|
if(exprName && exprName.free) {
|
|
const expressionHook = this.hooks.expression.get(exprName.name);
|
|
if(expressionHook !== undefined) {
|
|
const result = expressionHook.call(expression);
|
|
if(result === true)
|
|
return;
|
|
}
|
|
const expressionAnyMemberHook = this.hooks.expressionAnyMember.get(exprName.nameGeneral);
|
|
if(expressionAnyMemberHook !== undefined) {
|
|
const result = expressionAnyMemberHook.call(expression);
|
|
if(result === true)
|
|
return;
|
|
}
|
|
}
|
|
this.walkExpression(expression.object);
|
|
if(expression.computed === true)
|
|
this.walkExpression(expression.property);
|
|
}
|
|
|
|
walkThisExpression(expression) {
|
|
const expressionHook = this.hooks.expression.get("this");
|
|
if(expressionHook !== undefined) {
|
|
expressionHook.call(expression);
|
|
}
|
|
}
|
|
|
|
walkIdentifier(expression) {
|
|
if(!this.scope.definitions.has(expression.name)) {
|
|
const hook = this.hooks.expression.get(this.scope.renames.get(expression.name) || expression.name);
|
|
if(hook !== undefined) {
|
|
const result = hook.call(expression);
|
|
if(result === true)
|
|
return;
|
|
}
|
|
}
|
|
}
|
|
|
|
inScope(params, fn) {
|
|
const oldScope = this.scope;
|
|
this.scope = {
|
|
topLevelScope: oldScope.topLevelScope,
|
|
inTry: false,
|
|
inShorthand: false,
|
|
isStrict: oldScope.isStrict,
|
|
definitions: oldScope.definitions.createChild(),
|
|
renames: oldScope.renames.createChild()
|
|
};
|
|
|
|
this.scope.renames.set("this", null);
|
|
|
|
for(let paramIndex = 0, len = params.length; paramIndex < len; paramIndex++) {
|
|
const param = params[paramIndex];
|
|
|
|
if(typeof param !== "string") {
|
|
this.enterPattern(param, param => {
|
|
this.scope.renames.set(param, null);
|
|
this.scope.definitions.add(param);
|
|
});
|
|
} else if(param) {
|
|
this.scope.renames.set(param, null);
|
|
this.scope.definitions.add(param);
|
|
}
|
|
}
|
|
|
|
fn();
|
|
this.scope = oldScope;
|
|
}
|
|
|
|
detectStrictMode(statements) {
|
|
const isStrict = statements.length >= 1 &&
|
|
statements[0].type === "ExpressionStatement" &&
|
|
statements[0].expression.type === "Literal" &&
|
|
statements[0].expression.value === "use strict";
|
|
if(isStrict) {
|
|
this.scope.isStrict = true;
|
|
}
|
|
}
|
|
|
|
enterPattern(pattern, onIdent) {
|
|
if(!pattern) return;
|
|
switch(pattern.type) {
|
|
case "ArrayPattern":
|
|
this.enterArrayPattern(pattern, onIdent);
|
|
break;
|
|
case "AssignmentPattern":
|
|
this.enterAssignmentPattern(pattern, onIdent);
|
|
break;
|
|
case "Identifier":
|
|
this.enterIdentifier(pattern, onIdent);
|
|
break;
|
|
case "ObjectPattern":
|
|
this.enterObjectPattern(pattern, onIdent);
|
|
break;
|
|
case "RestElement":
|
|
this.enterRestElement(pattern, onIdent);
|
|
break;
|
|
}
|
|
}
|
|
|
|
enterIdentifier(pattern, onIdent) {
|
|
onIdent(pattern.name, pattern);
|
|
}
|
|
|
|
enterObjectPattern(pattern, onIdent) {
|
|
for(let propIndex = 0, len = pattern.properties.length; propIndex < len; propIndex++) {
|
|
const prop = pattern.properties[propIndex];
|
|
this.enterPattern(prop.value, onIdent);
|
|
}
|
|
}
|
|
|
|
enterArrayPattern(pattern, onIdent) {
|
|
for(let elementIndex = 0, len = pattern.elements.length; elementIndex < len; elementIndex++) {
|
|
const element = pattern.elements[elementIndex];
|
|
this.enterPattern(element, onIdent);
|
|
}
|
|
}
|
|
|
|
enterRestElement(pattern, onIdent) {
|
|
this.enterPattern(pattern.argument, onIdent);
|
|
}
|
|
|
|
enterAssignmentPattern(pattern, onIdent) {
|
|
this.enterPattern(pattern.left, onIdent);
|
|
}
|
|
|
|
evaluateExpression(expression) {
|
|
try {
|
|
const hook = this.hooks.evaluate.get(expression.type);
|
|
if(hook !== undefined) {
|
|
const result = hook.call(expression);
|
|
if(result !== undefined)
|
|
return result;
|
|
}
|
|
} catch(e) {
|
|
console.warn(e);
|
|
// ignore error
|
|
}
|
|
return new BasicEvaluatedExpression().setRange(expression.range);
|
|
}
|
|
|
|
parseString(expression) {
|
|
switch(expression.type) {
|
|
case "BinaryExpression":
|
|
if(expression.operator === "+")
|
|
return this.parseString(expression.left) + this.parseString(expression.right);
|
|
break;
|
|
case "Literal":
|
|
return expression.value + "";
|
|
}
|
|
throw new Error(expression.type + " is not supported as parameter for require");
|
|
}
|
|
|
|
parseCalculatedString(expression) {
|
|
switch(expression.type) {
|
|
case "BinaryExpression":
|
|
if(expression.operator === "+") {
|
|
const left = this.parseCalculatedString(expression.left);
|
|
const right = this.parseCalculatedString(expression.right);
|
|
if(left.code) {
|
|
return {
|
|
range: left.range,
|
|
value: left.value,
|
|
code: true
|
|
};
|
|
} else if(right.code) {
|
|
return {
|
|
range: [left.range[0], right.range ? right.range[1] : left.range[1]],
|
|
value: left.value + right.value,
|
|
code: true
|
|
};
|
|
} else {
|
|
return {
|
|
range: [left.range[0], right.range[1]],
|
|
value: left.value + right.value
|
|
};
|
|
}
|
|
}
|
|
break;
|
|
case "ConditionalExpression":
|
|
{
|
|
const consequent = this.parseCalculatedString(expression.consequent);
|
|
const alternate = this.parseCalculatedString(expression.alternate);
|
|
const items = [];
|
|
if(consequent.conditional)
|
|
items.push(...consequent.conditional);
|
|
else if(!consequent.code)
|
|
items.push(consequent);
|
|
else break;
|
|
if(alternate.conditional)
|
|
items.push(...alternate.conditional);
|
|
else if(!alternate.code)
|
|
items.push(alternate);
|
|
else break;
|
|
return {
|
|
value: "",
|
|
code: true,
|
|
conditional: items
|
|
};
|
|
}
|
|
case "Literal":
|
|
return {
|
|
range: expression.range,
|
|
value: expression.value + ""
|
|
};
|
|
}
|
|
return {
|
|
value: "",
|
|
code: true
|
|
};
|
|
}
|
|
|
|
parse(source, initialState) {
|
|
let ast;
|
|
let comments;
|
|
if(typeof source === "object" && source !== null) {
|
|
ast = source;
|
|
comments = source.comments;
|
|
} else {
|
|
comments = [];
|
|
ast = Parser.parse(source, {
|
|
sourceType: this.sourceType,
|
|
onComment: comments
|
|
});
|
|
}
|
|
|
|
const oldScope = this.scope;
|
|
const oldState = this.state;
|
|
const oldComments = this.comments;
|
|
this.scope = {
|
|
topLevelScope: true,
|
|
inTry: false,
|
|
inShorthand: false,
|
|
isStrict: false,
|
|
definitions: new StackedSetMap(),
|
|
renames: new StackedSetMap()
|
|
};
|
|
const state = this.state = initialState || {};
|
|
this.comments = comments;
|
|
if(this.hooks.program.call(ast, comments) === undefined) {
|
|
this.detectStrictMode(ast.body);
|
|
this.prewalkStatements(ast.body);
|
|
this.walkStatements(ast.body);
|
|
}
|
|
this.scope = oldScope;
|
|
this.state = oldState;
|
|
this.comments = oldComments;
|
|
return state;
|
|
}
|
|
|
|
evaluate(source) {
|
|
const ast = Parser.parse("(" + source + ")", {
|
|
sourceType: this.sourceType,
|
|
locations: false,
|
|
});
|
|
if(ast.body.length !== 1 || ast.body[0].type !== "ExpressionStatement")
|
|
throw new Error("evaluate: Source is not a expression");
|
|
return this.evaluateExpression(ast.body[0].expression);
|
|
}
|
|
|
|
getComments(range) {
|
|
return this.comments.filter(comment => comment.range[0] >= range[0] && comment.range[1] <= range[1]);
|
|
}
|
|
|
|
getCommentOptions(range) {
|
|
const comments = this.getComments(range);
|
|
if(comments.length === 0) return null;
|
|
const options = comments.map(comment => {
|
|
try {
|
|
let val = vm.runInNewContext(`(function(){return {${comment.value}};})()`);
|
|
return val;
|
|
} catch(e) {
|
|
return {};
|
|
}
|
|
});
|
|
return options.reduce((o, i) => Object.assign(o, i), {});
|
|
}
|
|
|
|
getNameForExpression(expression) {
|
|
let expr = expression;
|
|
const exprName = [];
|
|
while(expr.type === "MemberExpression" && expr.property.type === (expr.computed ? "Literal" : "Identifier")) {
|
|
exprName.push(expr.computed ? expr.property.value : expr.property.name);
|
|
expr = expr.object;
|
|
}
|
|
let free;
|
|
if(expr.type === "Identifier") {
|
|
free = !this.scope.definitions.has(expr.name);
|
|
exprName.push(this.scope.renames.get(expr.name) || expr.name);
|
|
} else if(expr.type === "ThisExpression" && this.scope.renames.get("this")) {
|
|
free = true;
|
|
exprName.push(this.scope.renames.get("this"));
|
|
} else if(expr.type === "ThisExpression") {
|
|
free = false;
|
|
exprName.push("this");
|
|
} else {
|
|
return null;
|
|
}
|
|
let prefix = "";
|
|
for(let i = exprName.length - 1; i >= 2; i--)
|
|
prefix += exprName[i] + ".";
|
|
if(exprName.length > 1)
|
|
prefix += exprName[1];
|
|
const name = prefix ? prefix + "." + exprName[0] : exprName[0];
|
|
const nameGeneral = prefix;
|
|
return {
|
|
name,
|
|
nameGeneral,
|
|
free
|
|
};
|
|
}
|
|
|
|
static parse(code, options) {
|
|
const type = options.sourceType;
|
|
const parserOptions = Object.assign(Object.create(null), defaultParserOptions, options);
|
|
|
|
if(type === "auto") {
|
|
parserOptions.sourceType = "module";
|
|
}
|
|
|
|
let ast;
|
|
let error;
|
|
let threw = false;
|
|
try {
|
|
ast = acorn.parse(code, parserOptions);
|
|
} catch(e) {
|
|
error = e;
|
|
threw = true;
|
|
}
|
|
|
|
if(threw && type === "auto") {
|
|
parserOptions.sourceType = "script";
|
|
if(Array.isArray(parserOptions.onComment)) {
|
|
parserOptions.onComment.length = 0;
|
|
}
|
|
try {
|
|
ast = acorn.parse(code, parserOptions);
|
|
threw = false;
|
|
} catch(e) {}
|
|
}
|
|
|
|
if(threw) {
|
|
throw error;
|
|
}
|
|
|
|
return ast;
|
|
}
|
|
}
|
|
|
|
module.exports = Parser;
|