mirror of https://github.com/webpack/webpack.git
1183 lines
40 KiB
JavaScript
1183 lines
40 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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var acorn = require("acorn-dynamic-import").default;
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var Tapable = require("tapable");
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var BasicEvaluatedExpression = require("./BasicEvaluatedExpression");
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function Parser(options) {
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Tapable.call(this);
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this.options = options;
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this.initializeEvaluating();
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}
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module.exports = Parser;
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// Syntax: https://developer.mozilla.org/en/SpiderMonkey/Parser_API
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Parser.prototype = Object.create(Tapable.prototype);
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Parser.prototype.constructor = Parser;
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Parser.prototype.initializeEvaluating = function() {
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function 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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this.plugin("evaluate Literal", function(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.plugin("evaluate LogicalExpression", function(expr) {
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var left;
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var leftAsBool;
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var 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.plugin("evaluate BinaryExpression", function(expr) {
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var left;
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var right;
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var 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 {
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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 === "==" || 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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}
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});
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this.plugin("evaluate UnaryExpression", function(expr) {
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if(expr.operator === "typeof") {
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var res;
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if(expr.argument.type === "Identifier") {
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var name = this.scope.renames["$" + expr.argument.name] || expr.argument.name;
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if(this.scope.definitions.indexOf(name) === -1) {
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res = this.applyPluginsBailResult1("evaluate typeof " + name, expr);
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if(res !== undefined) return res;
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}
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}
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if(expr.argument.type === "MemberExpression") {
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var expression = expr.argument;
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var exprName = [];
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while(expression.type === "MemberExpression" && !expression.computed) {
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exprName.unshift(this.scope.renames["$" + expression.property.name] || expression.property.name);
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expression = expression.object;
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}
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if(expression.type === "Identifier") {
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exprName.unshift(this.scope.renames["$" + expression.name] || expression.name);
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if(this.scope.definitions.indexOf(name) === -1) {
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exprName = exprName.join(".");
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res = this.applyPluginsBailResult1("evaluate typeof " + exprName, 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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var 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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var 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.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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}
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});
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this.plugin("evaluate typeof undefined", function(expr) {
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return new BasicEvaluatedExpression().setString("undefined").setRange(expr.range);
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});
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this.plugin("evaluate Identifier", function(expr) {
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var name = this.scope.renames["$" + expr.name] || expr.name;
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if(this.scope.definitions.indexOf(expr.name) === -1) {
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var result = this.applyPluginsBailResult1("evaluate Identifier " + name, expr);
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if(result) return result;
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return new BasicEvaluatedExpression().setIdentifier(name).setRange(expr.range);
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} else {
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return this.applyPluginsBailResult1("evaluate defined Identifier " + name, expr);
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}
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});
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this.plugin("evaluate MemberExpression", function(expression) {
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var expr = expression;
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var exprName = [];
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while(expr.type === "MemberExpression" &&
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expr.property.type === (expr.computed ? "Literal" : "Identifier")
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) {
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exprName.unshift(expr.property.name || expr.property.value);
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expr = expr.object;
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}
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if(expr.type === "Identifier") {
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var name = this.scope.renames["$" + expr.name] || expr.name;
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if(this.scope.definitions.indexOf(name) === -1) {
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exprName.unshift(name);
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exprName = exprName.join(".");
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if(this.scope.definitions.indexOf(expr.name) === -1) {
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var result = this.applyPluginsBailResult1("evaluate Identifier " + exprName, expression);
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if(result) return result;
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return new BasicEvaluatedExpression().setIdentifier(exprName).setRange(expression.range);
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} else {
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return this.applyPluginsBailResult1("evaluate defined Identifier " + exprName, expression);
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}
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}
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}
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});
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this.plugin("evaluate CallExpression", function(expr) {
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if(expr.callee.type !== "MemberExpression") return;
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if(expr.callee.property.type !== (expr.callee.computed ? "Literal" : "Identifier")) return;
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var param = this.evaluateExpression(expr.callee.object);
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if(!param) return;
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var property = expr.callee.property.name || expr.callee.property.value;
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return this.applyPluginsBailResult("evaluate CallExpression ." + property, expr, param);
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});
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this.plugin("evaluate CallExpression .replace", function(expr, param) {
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if(!param.isString()) return;
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if(expr.arguments.length !== 2) return;
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var arg1 = this.evaluateExpression(expr.arguments[0]);
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var arg2 = this.evaluateExpression(expr.arguments[1]);
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if(!arg1.isString() && !arg1.isRegExp()) return;
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arg1 = arg1.regExp || arg1.string;
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if(!arg2.isString()) return;
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arg2 = arg2.string;
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return new BasicEvaluatedExpression().setString(param.string.replace(arg1, arg2)).setRange(expr.range);
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});
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["substr", "substring"].forEach(function(fn) {
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this.plugin("evaluate CallExpression ." + fn, function(expr, param) {
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if(!param.isString()) return;
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var arg1;
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var result, str = param.string;
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switch(expr.arguments.length) {
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case 1:
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arg1 = this.evaluateExpression(expr.arguments[0]);
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if(!arg1.isNumber()) return;
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result = str[fn](arg1.number);
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break;
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case 2:
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arg1 = this.evaluateExpression(expr.arguments[0]);
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var arg2 = this.evaluateExpression(expr.arguments[1]);
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if(!arg1.isNumber()) return;
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if(!arg2.isNumber()) return;
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result = str[fn](arg1.number, arg2.number);
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break;
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default:
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return;
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}
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return new BasicEvaluatedExpression().setString(result).setRange(expr.range);
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});
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/**
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* @param {string} kind "cooked" | "raw"
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* @param {any[]} quasis quasis
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* @param {any[]} expressions expressions
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* @return {BasicEvaluatedExpression[]} Simplified template
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*/
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function getSimplifiedTemplateResult(kind, quasis, expressions) {
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var i = 0;
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var parts = [];
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for(i = 0; i < quasis.length; i++) {
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parts.push(new BasicEvaluatedExpression().setString(quasis[i].value[kind]).setRange(quasis[i].range));
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if(i > 0) {
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var prevExpr = parts[parts.length - 2],
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lastExpr = parts[parts.length - 1];
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var expr = this.evaluateExpression(expressions[i - 1]);
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if(!(expr.isString() || expr.isNumber())) continue;
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prevExpr.setString(prevExpr.string + (expr.isString() ? expr.string : expr.number) + lastExpr.string);
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prevExpr.setRange([prevExpr.range[0], lastExpr.range[1]]);
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parts.pop();
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}
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}
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return parts;
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}
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this.plugin("evaluate TemplateLiteral", function(node) {
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var parts = getSimplifiedTemplateResult.call(this, "cooked", node.quasis, node.expressions);
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if(parts.length === 1) {
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return parts[0].setRange(node.range);
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}
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return new BasicEvaluatedExpression().setTemplateString(parts).setRange(node.range);
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});
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this.plugin("evaluate TaggedTemplateExpression", function(node) {
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if(this.evaluateExpression(node.tag).identifier !== "String.raw") return;
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var parts = getSimplifiedTemplateResult.call(this, "raw", node.quasi.quasis, node.quasi.expressions);
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return new BasicEvaluatedExpression().setTemplateString(parts).setRange(node.range);
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});
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}, this);
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this.plugin("evaluate CallExpression .split", function(expr, param) {
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if(!param.isString()) return;
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if(expr.arguments.length !== 1) return;
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var result;
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var arg = this.evaluateExpression(expr.arguments[0]);
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if(arg.isString()) {
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result = param.string.split(arg.string);
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} else if(arg.isRegExp()) {
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result = param.string.split(arg.regExp);
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} else return;
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return new BasicEvaluatedExpression().setArray(result).setRange(expr.range);
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});
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this.plugin("evaluate ConditionalExpression", function(expr) {
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var condition = this.evaluateExpression(expr.test);
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var conditionValue = condition.asBool();
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var res;
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if(conditionValue === undefined) {
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var consequent = this.evaluateExpression(expr.consequent);
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var alternate = this.evaluateExpression(expr.alternate);
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if(!consequent || !alternate) return;
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res = new BasicEvaluatedExpression();
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if(consequent.isConditional())
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res.setOptions(consequent.options);
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else
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res.setOptions([consequent]);
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if(alternate.isConditional())
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res.addOptions(alternate.options);
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else
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res.addOptions([alternate]);
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} else {
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res = this.evaluateExpression(conditionValue ? expr.consequent : expr.alternate);
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}
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res.setRange(expr.range);
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return res;
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});
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this.plugin("evaluate ArrayExpression", function(expr) {
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var items = expr.elements.map(function(element) {
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return element !== null && this.evaluateExpression(element);
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}, this);
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if(!items.every(Boolean)) return;
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return new BasicEvaluatedExpression().setItems(items).setRange(expr.range);
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});
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};
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Parser.prototype.getRenameIdentifier = function getRenameIdentifier(expr) {
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var result = this.evaluateExpression(expr);
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if(!result) return;
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if(result.isIdentifier()) return result.identifier;
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return;
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};
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Parser.prototype.walkClass = function walkClass(classy) {
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if(classy.superClass)
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this.walkExpression(classy.superClass);
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if(classy.body && classy.body.type === "ClassBody") {
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classy.body.body.forEach(function(methodDefinition) {
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if(methodDefinition.type === "MethodDefinition")
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this.walkMethodDefinition(methodDefinition);
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}, this);
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}
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};
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Parser.prototype.walkMethodDefinition = function walkMethodDefinition(methodDefinition) {
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if(methodDefinition.computed && methodDefinition.key)
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this.walkExpression(methodDefinition.key);
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if(methodDefinition.value)
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this.walkExpression(methodDefinition.value);
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};
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Parser.prototype.walkStatements = function walkStatements(statements) {
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for(var indexA = 0, lenA = statements.length; indexA < lenA; indexA++) {
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var statementA = statements[indexA];
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if(this.isHoistedStatement(statementA))
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this.walkStatement(statementA);
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}
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for(var indexB = 0, lenB = statements.length; indexB < lenB; indexB++) {
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var statementB = statements[indexB];
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if(!this.isHoistedStatement(statementB))
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this.walkStatement(statementB);
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}
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};
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Parser.prototype.isHoistedStatement = function isHoistedStatement(statement) {
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switch(statement.type) {
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case "ImportDeclaration":
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case "ExportAllDeclaration":
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case "ExportNamedDeclaration":
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return true;
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}
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return false;
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};
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|
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Parser.prototype.walkStatement = function walkStatement(statement) {
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if(this.applyPluginsBailResult1("statement", statement) !== undefined) return;
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if(this["walk" + statement.type])
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this["walk" + statement.type](statement);
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};
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// Real Statements
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Parser.prototype.walkBlockStatement = function walkBlockStatement(statement) {
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this.walkStatements(statement.body);
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};
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Parser.prototype.walkExpressionStatement = function walkExpressionStatement(statement) {
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this.walkExpression(statement.expression);
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};
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Parser.prototype.walkIfStatement = function walkIfStatement(statement) {
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var result = this.applyPluginsBailResult1("statement if", statement);
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if(result === undefined) {
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this.walkExpression(statement.test);
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this.walkStatement(statement.consequent);
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if(statement.alternate)
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this.walkStatement(statement.alternate);
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} else {
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if(result)
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this.walkStatement(statement.consequent);
|
|
else if(statement.alternate)
|
|
this.walkStatement(statement.alternate);
|
|
}
|
|
};
|
|
|
|
Parser.prototype.walkLabeledStatement = function walkLabeledStatement(statement) {
|
|
var result = this.applyPluginsBailResult1("label " + statement.label.name, statement);
|
|
if(result !== true)
|
|
this.walkStatement(statement.body);
|
|
};
|
|
|
|
Parser.prototype.walkWithStatement = function walkWithStatement(statement) {
|
|
this.walkExpression(statement.object);
|
|
this.walkStatement(statement.body);
|
|
};
|
|
|
|
Parser.prototype.walkSwitchStatement = function walkSwitchStatement(statement) {
|
|
this.walkExpression(statement.discriminant);
|
|
this.walkSwitchCases(statement.cases);
|
|
};
|
|
|
|
Parser.prototype.walkReturnStatement =
|
|
Parser.prototype.walkThrowStatement = function walkArgumentStatement(statement) {
|
|
if(statement.argument)
|
|
this.walkExpression(statement.argument);
|
|
};
|
|
|
|
Parser.prototype.walkTryStatement = function 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);
|
|
};
|
|
|
|
Parser.prototype.walkWhileStatement =
|
|
Parser.prototype.walkDoWhileStatement = function walkLoopStatement(statement) {
|
|
this.walkExpression(statement.test);
|
|
this.walkStatement(statement.body);
|
|
};
|
|
|
|
Parser.prototype.walkForStatement = function 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);
|
|
};
|
|
|
|
Parser.prototype.walkForInStatement = function walkForInStatement(statement) {
|
|
if(statement.left.type === "VariableDeclaration")
|
|
this.walkStatement(statement.left);
|
|
else
|
|
this.walkExpression(statement.left);
|
|
this.walkExpression(statement.right);
|
|
this.walkStatement(statement.body);
|
|
};
|
|
|
|
Parser.prototype.walkForOfStatement = function walkForOfStatement(statement) {
|
|
if(statement.left.type === "VariableDeclaration")
|
|
this.walkStatement(statement.left);
|
|
else
|
|
this.walkExpression(statement.left);
|
|
this.walkExpression(statement.right);
|
|
this.walkStatement(statement.body);
|
|
};
|
|
|
|
// Declarations
|
|
Parser.prototype.walkFunctionDeclaration = function walkFunctionDeclaration(statement) {
|
|
this.scope.renames["$" + statement.id.name] = undefined;
|
|
this.scope.definitions.push(statement.id.name);
|
|
this.inScope(statement.params, function() {
|
|
if(statement.body.type === "BlockStatement")
|
|
this.walkStatement(statement.body);
|
|
else
|
|
this.walkExpression(statement.body);
|
|
}.bind(this));
|
|
};
|
|
|
|
Parser.prototype.walkImportDeclaration = function walkImportDeclaration(statement) {
|
|
var source = statement.source.value;
|
|
this.applyPluginsBailResult("import", statement, source);
|
|
statement.specifiers.forEach(function(specifier) {
|
|
var name = specifier.local.name;
|
|
this.scope.renames["$" + name] = undefined;
|
|
this.scope.definitions.push(name);
|
|
switch(specifier.type) {
|
|
case "ImportDefaultSpecifier":
|
|
this.applyPluginsBailResult("import specifier", statement, source, "default", name);
|
|
break;
|
|
case "ImportSpecifier":
|
|
this.applyPluginsBailResult("import specifier", statement, source, specifier.imported.name, name);
|
|
break;
|
|
case "ImportNamespaceSpecifier":
|
|
this.applyPluginsBailResult("import specifier", statement, source, null, name);
|
|
break;
|
|
}
|
|
}, this);
|
|
};
|
|
|
|
Parser.prototype.walkExportNamedDeclaration = function walkExportNamedDeclaration(statement) {
|
|
if(statement.source) {
|
|
var source = statement.source.value;
|
|
this.applyPluginsBailResult("export import", statement, source);
|
|
} else {
|
|
this.applyPluginsBailResult1("export", statement);
|
|
}
|
|
if(statement.declaration) {
|
|
if(/Expression$/.test(statement.declaration.type)) {
|
|
throw new Error("Doesn't occur?");
|
|
} else {
|
|
if(!this.applyPluginsBailResult("export declaration", statement, statement.declaration)) {
|
|
var pos = this.scope.definitions.length;
|
|
this.walkStatement(statement.declaration);
|
|
var newDefs = this.scope.definitions.slice(pos);
|
|
for(var index = newDefs.length - 1; index >= 0; index--) {
|
|
var def = newDefs[index];
|
|
this.applyPluginsBailResult("export specifier", statement, def, def, index);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
if(statement.specifiers) {
|
|
for(var specifierIndex = 0; specifierIndex < statement.specifiers.length; specifierIndex++) {
|
|
var specifier = statement.specifiers[specifierIndex];
|
|
switch(specifier.type) {
|
|
case "ExportSpecifier":
|
|
var name = specifier.exported.name;
|
|
if(source)
|
|
this.applyPluginsBailResult("export import specifier", statement, source, specifier.local.name, name, specifierIndex);
|
|
else
|
|
this.applyPluginsBailResult("export specifier", statement, specifier.local.name, name, specifierIndex);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
};
|
|
|
|
Parser.prototype.walkExportDefaultDeclaration = function walkExportDefaultDeclaration(statement) {
|
|
this.applyPluginsBailResult1("export", statement);
|
|
if(/Declaration$/.test(statement.declaration.type)) {
|
|
if(!this.applyPluginsBailResult("export declaration", statement, statement.declaration)) {
|
|
var pos = this.scope.definitions.length;
|
|
this.walkStatement(statement.declaration);
|
|
var newDefs = this.scope.definitions.slice(pos);
|
|
for(var index = 0, len = newDefs.length; index < len; index++) {
|
|
var def = newDefs[index];
|
|
this.applyPluginsBailResult("export specifier", statement, def, "default");
|
|
}
|
|
}
|
|
} else {
|
|
this.walkExpression(statement.declaration);
|
|
if(!this.applyPluginsBailResult("export expression", statement, statement.declaration)) {
|
|
this.applyPluginsBailResult("export specifier", statement, statement.declaration, "default");
|
|
}
|
|
}
|
|
};
|
|
|
|
Parser.prototype.walkExportAllDeclaration = function walkExportAllDeclaration(statement) {
|
|
var source = statement.source.value;
|
|
this.applyPluginsBailResult("export import", statement, source);
|
|
this.applyPluginsBailResult("export import specifier", statement, source, null, null, 0);
|
|
};
|
|
|
|
Parser.prototype.walkVariableDeclaration = function walkVariableDeclaration(statement) {
|
|
if(statement.declarations)
|
|
this.walkVariableDeclarators(statement.declarations);
|
|
};
|
|
|
|
Parser.prototype.walkClassDeclaration = function walkClassDeclaration(statement) {
|
|
this.scope.renames["$" + statement.id.name] = undefined;
|
|
this.scope.definitions.push(statement.id.name);
|
|
this.walkClass(statement);
|
|
};
|
|
|
|
Parser.prototype.walkSwitchCases = function walkSwitchCases(switchCases) {
|
|
for(var index = 0, len = switchCases.length; index < len; index++) {
|
|
var switchCase = switchCases[index];
|
|
|
|
if(switchCase.test) {
|
|
this.walkExpression(switchCase.test);
|
|
}
|
|
this.walkStatements(switchCase.consequent);
|
|
}
|
|
};
|
|
|
|
Parser.prototype.walkCatchClause = function walkCatchClause(catchClause) {
|
|
if(catchClause.guard)
|
|
this.walkExpression(catchClause.guard);
|
|
this.inScope([catchClause.param], function() {
|
|
this.walkStatement(catchClause.body);
|
|
}.bind(this));
|
|
};
|
|
|
|
Parser.prototype.walkVariableDeclarators = function walkVariableDeclarators(declarators) {
|
|
var _this = this;
|
|
declarators.forEach(function(declarator) {
|
|
switch(declarator.type) {
|
|
case "VariableDeclarator":
|
|
var renameIdentifier = declarator.init && _this.getRenameIdentifier(declarator.init);
|
|
if(renameIdentifier && declarator.id.type === "Identifier" && _this.applyPluginsBailResult1("can-rename " + renameIdentifier, declarator.init)) {
|
|
// renaming with "var a = b;"
|
|
if(!_this.applyPluginsBailResult1("rename " + renameIdentifier, declarator.init)) {
|
|
_this.scope.renames["$" + declarator.id.name] = _this.scope.renames["$" + renameIdentifier] || renameIdentifier;
|
|
var idx = _this.scope.definitions.indexOf(declarator.id.name);
|
|
if(idx >= 0) _this.scope.definitions.splice(idx, 1);
|
|
}
|
|
} else {
|
|
_this.enterPattern(declarator.id, function(name, decl) {
|
|
if(!_this.applyPluginsBailResult1("var " + name, decl)) {
|
|
_this.scope.renames["$" + name] = undefined;
|
|
_this.scope.definitions.push(name);
|
|
}
|
|
});
|
|
if(declarator.init)
|
|
_this.walkExpression(declarator.init);
|
|
}
|
|
break;
|
|
}
|
|
});
|
|
};
|
|
|
|
Parser.prototype.walkExpressions = function walkExpressions(expressions) {
|
|
for(var expressionsIndex = 0, len = expressions.length; expressionsIndex < len; expressionsIndex++) {
|
|
var expression = expressions[expressionsIndex];
|
|
if(expression)
|
|
this.walkExpression(expression);
|
|
}
|
|
};
|
|
|
|
Parser.prototype.walkExpression = function walkExpression(expression) {
|
|
if(this["walk" + expression.type])
|
|
return this["walk" + expression.type](expression);
|
|
};
|
|
|
|
Parser.prototype.walkAwaitExpression = function walkAwaitExpression(expression) {
|
|
var argument = expression.argument;
|
|
if(this["walk" + argument.type])
|
|
return this["walk" + argument.type](argument);
|
|
};
|
|
|
|
Parser.prototype.walkArrayExpression = function walkArrayExpression(expression) {
|
|
if(expression.elements)
|
|
this.walkExpressions(expression.elements);
|
|
};
|
|
|
|
Parser.prototype.walkSpreadElement = function walkSpreadElement(expression) {
|
|
if(expression.argument)
|
|
this.walkExpression(expression.argument);
|
|
};
|
|
|
|
Parser.prototype.walkObjectExpression = function walkObjectExpression(expression) {
|
|
for(var propIndex = 0, len = expression.properties.length; propIndex < len; propIndex++) {
|
|
var 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;
|
|
}
|
|
};
|
|
|
|
Parser.prototype.walkFunctionExpression = function walkFunctionExpression(expression) {
|
|
this.inScope(expression.params, function() {
|
|
if(expression.body.type === "BlockStatement")
|
|
this.walkStatement(expression.body);
|
|
else
|
|
this.walkExpression(expression.body);
|
|
}.bind(this));
|
|
};
|
|
|
|
Parser.prototype.walkArrowFunctionExpression = function walkArrowFunctionExpression(expression) {
|
|
this.inScope(expression.params, function() {
|
|
if(expression.body.type === "BlockStatement")
|
|
this.walkStatement(expression.body);
|
|
else
|
|
this.walkExpression(expression.body);
|
|
}.bind(this));
|
|
};
|
|
|
|
Parser.prototype.walkSequenceExpression = function walkSequenceExpression(expression) {
|
|
if(expression.expressions)
|
|
this.walkExpressions(expression.expressions);
|
|
};
|
|
|
|
Parser.prototype.walkUpdateExpression = function walkUpdateExpression(expression) {
|
|
this.walkExpression(expression.argument);
|
|
};
|
|
|
|
Parser.prototype.walkUnaryExpression = function walkUnaryExpression(expression) {
|
|
if(expression.operator === "typeof") {
|
|
var expr = expression.argument;
|
|
var exprName = [];
|
|
while(expr.type === "MemberExpression" &&
|
|
expr.property.type === (expr.computed ? "Literal" : "Identifier")
|
|
) {
|
|
exprName.unshift(expr.property.name || expr.property.value);
|
|
expr = expr.object;
|
|
}
|
|
if(expr.type === "Identifier" && this.scope.definitions.indexOf(expr.name) === -1) {
|
|
exprName.unshift(this.scope.renames["$" + expr.name] || expr.name);
|
|
exprName = exprName.join(".");
|
|
var result = this.applyPluginsBailResult1("typeof " + exprName, expression);
|
|
if(result === true)
|
|
return;
|
|
}
|
|
}
|
|
this.walkExpression(expression.argument);
|
|
};
|
|
|
|
Parser.prototype.walkBinaryExpression =
|
|
Parser.prototype.walkLogicalExpression = function walkLeftRightExpression(expression) {
|
|
this.walkExpression(expression.left);
|
|
this.walkExpression(expression.right);
|
|
};
|
|
|
|
Parser.prototype.walkAssignmentExpression = function walkAssignmentExpression(expression) {
|
|
var renameIdentifier = this.getRenameIdentifier(expression.right);
|
|
if(expression.left.type === "Identifier" && renameIdentifier && this.applyPluginsBailResult1("can-rename " + renameIdentifier, expression.right)) {
|
|
// renaming "a = b;"
|
|
if(!this.applyPluginsBailResult1("rename " + renameIdentifier, expression.right)) {
|
|
this.scope.renames["$" + expression.left.name] = renameIdentifier;
|
|
var idx = this.scope.definitions.indexOf(expression.left.name);
|
|
if(idx >= 0) this.scope.definitions.splice(idx, 1);
|
|
}
|
|
} else if(expression.left.type === "Identifier") {
|
|
if(!this.applyPluginsBailResult1("assigned " + expression.left.name, expression)) {
|
|
this.walkExpression(expression.right);
|
|
}
|
|
this.scope.renames["$" + expression.left.name] = undefined;
|
|
if(!this.applyPluginsBailResult1("assign " + expression.left.name, expression)) {
|
|
this.walkExpression(expression.left);
|
|
}
|
|
} else {
|
|
this.walkExpression(expression.right);
|
|
this.scope.renames["$" + expression.left.name] = undefined;
|
|
this.walkExpression(expression.left);
|
|
}
|
|
};
|
|
|
|
Parser.prototype.walkConditionalExpression = function walkConditionalExpression(expression) {
|
|
var result = this.applyPluginsBailResult1("expression ?:", 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);
|
|
}
|
|
};
|
|
|
|
Parser.prototype.walkNewExpression = function walkNewExpression(expression) {
|
|
this.walkExpression(expression.callee);
|
|
if(expression.arguments)
|
|
this.walkExpressions(expression.arguments);
|
|
};
|
|
|
|
Parser.prototype.walkYieldExpression = function walkYieldExpression(expression) {
|
|
if(expression.argument)
|
|
this.walkExpression(expression.argument);
|
|
};
|
|
|
|
Parser.prototype.walkTemplateLiteral = function walkTemplateLiteral(expression) {
|
|
if(expression.expressions)
|
|
this.walkExpressions(expression.expressions);
|
|
};
|
|
|
|
Parser.prototype.walkTaggedTemplateExpression = function walkTaggedTemplateExpression(expression) {
|
|
if(expression.tag)
|
|
this.walkExpression(expression.tag);
|
|
if(expression.quasi && expression.quasi.expressions)
|
|
this.walkExpressions(expression.quasi.expressions);
|
|
};
|
|
|
|
Parser.prototype.walkClassExpression = function walkClassExpression(expression) {
|
|
this.walkClass(expression);
|
|
};
|
|
|
|
Parser.prototype.walkCallExpression = function walkCallExpression(expression) {
|
|
var result;
|
|
|
|
function walkIIFE(functionExpression, options) {
|
|
var params = functionExpression.params;
|
|
var args = options.map(function(arg) {
|
|
var renameIdentifier = this.getRenameIdentifier(arg);
|
|
if(renameIdentifier && this.applyPluginsBailResult1("can-rename " + renameIdentifier, arg)) {
|
|
if(!this.applyPluginsBailResult1("rename " + renameIdentifier, arg))
|
|
return renameIdentifier;
|
|
}
|
|
this.walkExpression(arg);
|
|
}, this);
|
|
this.inScope(params.filter(function(identifier, idx) {
|
|
return !args[idx];
|
|
}), function() {
|
|
for(var i = 0; i < args.length; i++) {
|
|
var param = args[i];
|
|
if(!param) continue;
|
|
if(!params[i] || params[i].type !== "Identifier") continue;
|
|
this.scope.renames["$" + params[i].name] = param;
|
|
}
|
|
if(functionExpression.body.type === "BlockStatement")
|
|
this.walkStatement(functionExpression.body);
|
|
else
|
|
this.walkExpression(functionExpression.body);
|
|
}.bind(this));
|
|
}
|
|
if(expression.callee.type === "MemberExpression" &&
|
|
expression.callee.object.type === "FunctionExpression" &&
|
|
!expression.callee.computed &&
|
|
(["call", "bind"]).indexOf(expression.callee.property.name) >= 0 &&
|
|
expression.arguments &&
|
|
expression.arguments.length > 1
|
|
) {
|
|
// (function(...) { }.call/bind(?, ...))
|
|
walkIIFE.call(this, expression.callee.object, expression.arguments.slice(1));
|
|
this.walkExpression(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.applyPluginsBailResult1("import-call", expression);
|
|
if(result === true)
|
|
return;
|
|
|
|
if(expression.arguments)
|
|
this.walkExpressions(expression.arguments);
|
|
} else {
|
|
|
|
var callee = this.evaluateExpression(expression.callee);
|
|
if(callee.isIdentifier()) {
|
|
result = this.applyPluginsBailResult1("call " + callee.identifier, expression);
|
|
if(result === true)
|
|
return;
|
|
}
|
|
|
|
if(expression.callee)
|
|
this.walkExpression(expression.callee);
|
|
if(expression.arguments)
|
|
this.walkExpressions(expression.arguments);
|
|
}
|
|
};
|
|
|
|
Parser.prototype.walkMemberExpression = function walkMemberExpression(expression) {
|
|
var expr = expression;
|
|
var exprName = [];
|
|
while(expr.type === "MemberExpression" &&
|
|
expr.property.type === (expr.computed ? "Literal" : "Identifier")
|
|
) {
|
|
exprName.unshift(expr.property.name || expr.property.value);
|
|
expr = expr.object;
|
|
}
|
|
if(expr.type === "Identifier" && this.scope.definitions.indexOf(expr.name) === -1) {
|
|
exprName.unshift(this.scope.renames["$" + expr.name] || expr.name);
|
|
var result = this.applyPluginsBailResult1("expression " + exprName.join("."), expression);
|
|
if(result === true)
|
|
return;
|
|
exprName[exprName.length - 1] = "*";
|
|
result = this.applyPluginsBailResult1("expression " + exprName.join("."), expression);
|
|
if(result === true)
|
|
return;
|
|
}
|
|
this.walkExpression(expression.object);
|
|
if(expression.computed === true)
|
|
this.walkExpression(expression.property);
|
|
};
|
|
|
|
Parser.prototype.walkIdentifier = function walkIdentifier(expression) {
|
|
if(this.scope.definitions.indexOf(expression.name) === -1) {
|
|
var result = this.applyPluginsBailResult1("expression " + (this.scope.renames["$" + expression.name] || expression.name), expression);
|
|
if(result === true)
|
|
return;
|
|
}
|
|
};
|
|
|
|
Parser.prototype.inScope = function inScope(params, fn) {
|
|
var oldScope = this.scope;
|
|
var _this = this;
|
|
this.scope = {
|
|
inTry: false,
|
|
inShorthand: false,
|
|
definitions: oldScope.definitions.slice(),
|
|
renames: Object.create(oldScope.renames)
|
|
};
|
|
|
|
for(var paramIndex = 0, len = params.length; paramIndex < len; paramIndex++) {
|
|
var param = params[paramIndex];
|
|
|
|
if(typeof param !== "string") {
|
|
param = _this.enterPattern(param, function(param) {
|
|
_this.scope.renames["$" + param] = undefined;
|
|
_this.scope.definitions.push(param);
|
|
});
|
|
} else {
|
|
_this.scope.renames["$" + param] = undefined;
|
|
_this.scope.definitions.push(param);
|
|
}
|
|
}
|
|
|
|
fn();
|
|
_this.scope = oldScope;
|
|
};
|
|
|
|
Parser.prototype.enterPattern = function enterPattern(pattern, onIdent) {
|
|
if(pattern && this["enter" + pattern.type])
|
|
return this["enter" + pattern.type](pattern, onIdent);
|
|
};
|
|
|
|
Parser.prototype.enterIdentifier = function enterIdentifier(pattern, onIdent) {
|
|
onIdent(pattern.name, pattern);
|
|
};
|
|
|
|
Parser.prototype.enterObjectPattern = function enterObjectPattern(pattern, onIdent) {
|
|
for(var propIndex = 0, len = pattern.properties.length; propIndex < len; propIndex++) {
|
|
var prop = pattern.properties[propIndex];
|
|
this.enterPattern(prop.value, onIdent);
|
|
}
|
|
};
|
|
|
|
Parser.prototype.enterArrayPattern = function enterArrayPattern(pattern, onIdent) {
|
|
for(var elementIndex = 0, len = pattern.elements.length; elementIndex < len; elementIndex++) {
|
|
var element = pattern.elements[elementIndex];
|
|
this.enterPattern(element, onIdent);
|
|
}
|
|
};
|
|
|
|
Parser.prototype.enterRestElement = function enterRestElement(pattern, onIdent) {
|
|
this.enterPattern(pattern.argument, onIdent);
|
|
};
|
|
|
|
Parser.prototype.enterAssignmentPattern = function enterAssignmentPattern(pattern, onIdent) {
|
|
this.enterPattern(pattern.left, onIdent);
|
|
this.walkExpression(pattern.right);
|
|
};
|
|
|
|
Parser.prototype.evaluateExpression = function evaluateExpression(expression) {
|
|
try {
|
|
var result = this.applyPluginsBailResult1("evaluate " + expression.type, expression);
|
|
if(result !== undefined)
|
|
return result;
|
|
} catch(e) {
|
|
console.warn(e);
|
|
// ignore error
|
|
}
|
|
return new BasicEvaluatedExpression().setRange(expression.range);
|
|
};
|
|
|
|
Parser.prototype.parseString = function 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");
|
|
};
|
|
|
|
Parser.prototype.parseCalculatedString = function parseCalculatedString(expression) {
|
|
switch(expression.type) {
|
|
case "BinaryExpression":
|
|
if(expression.operator === "+") {
|
|
var left = this.parseCalculatedString(expression.left);
|
|
var 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":
|
|
var consequent = this.parseCalculatedString(expression.consequent);
|
|
var alternate = this.parseCalculatedString(expression.alternate);
|
|
var items = [];
|
|
if(consequent.conditional)
|
|
Array.prototype.push.apply(items, consequent.conditional);
|
|
else if(!consequent.code)
|
|
items.push(consequent);
|
|
else break;
|
|
if(alternate.conditional)
|
|
Array.prototype.push.apply(items, 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
|
|
};
|
|
};
|
|
|
|
["parseString", "parseCalculatedString"].forEach(function(fn) {
|
|
Parser.prototype[fn + "Array"] = function parseXXXArray(expression) {
|
|
switch(expression.type) {
|
|
case "ArrayExpression":
|
|
var arr = [];
|
|
if(expression.elements)
|
|
expression.elements.forEach(function(expr) {
|
|
arr.push(this[fn](expr));
|
|
}, this);
|
|
return arr;
|
|
}
|
|
return [this[fn](expression)];
|
|
};
|
|
});
|
|
|
|
var POSSIBLE_AST_OPTIONS = [{
|
|
ranges: true,
|
|
locations: true,
|
|
ecmaVersion: 2017,
|
|
sourceType: "module",
|
|
plugins: {
|
|
dynamicImport: true
|
|
}
|
|
}, {
|
|
ranges: true,
|
|
locations: true,
|
|
ecmaVersion: 2017,
|
|
sourceType: "script",
|
|
plugins: {
|
|
dynamicImport: true
|
|
}
|
|
}];
|
|
|
|
Parser.prototype.parse = function parse(source, initialState) {
|
|
var ast, comments = [];
|
|
for(var i = 0, len = POSSIBLE_AST_OPTIONS.length; i < len; i++) {
|
|
if(!ast) {
|
|
try {
|
|
comments.length = 0;
|
|
POSSIBLE_AST_OPTIONS[i].onComment = comments;
|
|
ast = acorn.parse(source, POSSIBLE_AST_OPTIONS[i]);
|
|
} catch(e) {
|
|
// ignore the error
|
|
}
|
|
}
|
|
}
|
|
if(!ast) {
|
|
// for the error
|
|
ast = acorn.parse(source, {
|
|
ranges: true,
|
|
locations: true,
|
|
ecmaVersion: 2017,
|
|
sourceType: "module",
|
|
plugins: {
|
|
dynamicImport: true
|
|
},
|
|
onComment: comments
|
|
});
|
|
}
|
|
if(!ast || typeof ast !== "object")
|
|
throw new Error("Source couldn't be parsed");
|
|
var oldScope = this.scope;
|
|
var oldState = this.state;
|
|
this.scope = {
|
|
inTry: false,
|
|
definitions: [],
|
|
renames: {}
|
|
};
|
|
var state = this.state = initialState || {};
|
|
if(this.applyPluginsBailResult("program", ast, comments) === undefined)
|
|
this.walkStatements(ast.body);
|
|
this.scope = oldScope;
|
|
this.state = oldState;
|
|
return state;
|
|
};
|
|
|
|
Parser.prototype.evaluate = function evaluate(source) {
|
|
var ast = acorn.parse("(" + source + ")", {
|
|
ranges: true,
|
|
locations: true,
|
|
ecmaVersion: 2017,
|
|
sourceType: "module",
|
|
plugins: {
|
|
dynamicImport: true
|
|
}
|
|
});
|
|
if(!ast || typeof ast !== "object" || ast.type !== "Program")
|
|
throw new Error("evaluate: Source couldn't be parsed");
|
|
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);
|
|
};
|