mirror of https://github.com/webpack/webpack.git
784 lines
28 KiB
JavaScript
784 lines
28 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 esprima = require("esprima");
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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.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 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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if(expr.operator == "&&") {
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var left = this.evaluateExpression(expr.left);
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var leftAsBool = left && left.asBool();
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if(leftAsBool === false) return new BasicEvaluatedExpression().setBoolean(false).setRange(expr.range);
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if(leftAsBool !== true) return;
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var right = this.evaluateExpression(expr.right);
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var rightAsBool = right && right.asBool();
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if(typeof rightAsBool === "boolean")
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return new BasicEvaluatedExpression().setBoolean(rightAsBool).setRange(expr.range);
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} else if(expr.operator == "||") {
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var left = this.evaluateExpression(expr.left);
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var leftAsBool = left && left.asBool();
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if(leftAsBool === true) return new BasicEvaluatedExpression().setBoolean(true).setRange(expr.range);
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if(leftAsBool !== false) return;
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var right = this.evaluateExpression(expr.right);
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var rightAsBool = right && right.asBool();
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if(typeof rightAsBool === "boolean")
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return new BasicEvaluatedExpression().setBoolean(rightAsBool).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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if(expr.operator == "+") {
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var left = this.evaluateExpression(expr.left);
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var right = this.evaluateExpression(expr.right);
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if(!left || !right) return;
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var 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.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, new BasicEvaluatedExpression().setString(""))
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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() && left.postfix.isString()) {
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if(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(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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}
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} else {
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if(right.isString()) {
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res.setWrapped(new BasicEvaluatedExpression().setString(""), 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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var left = this.evaluateExpression(expr.left);
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var 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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var 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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var left = this.evaluateExpression(expr.left);
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var 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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var 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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var left = this.evaluateExpression(expr.left);
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var 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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var 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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var left = this.evaluateExpression(expr.left);
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var right = this.evaluateExpression(expr.right);
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if(!left || !right) return;
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var 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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var left = this.evaluateExpression(expr.left);
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var right = this.evaluateExpression(expr.right);
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if(!left || !right) return;
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var 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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if(expr.argument.type == "Identifier") {
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var res = this.applyPluginsBailResult("evaluate typeof " + expr.argument.name, expr);
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if(res !== undefined) return res;
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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.property.type == "Identifier") {
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exprName.unshift(expression.property.name);
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expression = expression.object;
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}
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if(expression.type == "Identifier" && this.scope.definitions.indexOf(expression.name) == -1) {
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exprName.unshift(this.scope.renames["$"+expression.name] || expression.name);
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exprName = exprName.join(".");
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var res = this.applyPluginsBailResult("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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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 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.applyPluginsBailResult("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.applyPluginsBailResult("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" && expr.property.type == "Identifier") {
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exprName.unshift(expr.property.name);
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expr = expr.object;
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}
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if(expr.type == "Identifier") {
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exprName.unshift(this.scope.renames["$"+expr.name] || expr.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.applyPluginsBailResult("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.applyPluginsBailResult("evaluate defined Identifier " + exprName, expression);
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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 != "Identifier") return;
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var param = this.evaluateExpression(expr.callee.object);
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if(!param) return;
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return this.applyPluginsBailResult("evaluate CallExpression ." + expr.callee.property.name, 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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this.plugin("evaluate CallExpression .substr", function(expr, param) {
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if(!param.isString()) return;
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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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var arg1 = this.evaluateExpression(expr.arguments[0]);
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if(!arg1.isNumber()) return;
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result = str.substr(arg1.number);
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break;
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case 2:
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var arg1 = this.evaluateExpression(expr.arguments[0]);
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var arg2 = this.evaluateExpression(expr.arguments[0]);
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if(!arg1.isNumber()) return;
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if(!arg2.isNumber()) return;
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result = str.substr(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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this.plugin("evaluate CallExpression .substring", function(expr, param) {
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if(!param.isString()) return;
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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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var arg1 = this.evaluateExpression(expr.arguments[0]);
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if(!arg1.isNumber()) return;
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result = str.substring(arg1.number);
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break;
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case 2:
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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.isNumber()) return;
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if(!arg2.isNumber()) return;
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result = str.substring(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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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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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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var 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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var 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 this.evaluateExpression(element);
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}, this);
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if(items.filter(function(i) { return !i; }).length > 0) 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.walkStatements = function walkStatements(statements) {
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statements.forEach(function(statement) {
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this.walkStatement(statement);
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}, this);
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}
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Parser.prototype.walkStatement = function walkStatement(statement) {
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if(this.applyPluginsBailResult("statement", statement) !== undefined) return;
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switch(statement.type) {
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// Real Statements
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case "BlockStatement":
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this.walkStatements(statement.body);
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break;
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case "ExpressionStatement":
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this.walkExpression(statement.expression);
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break;
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case "IfStatement":
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var result = this.applyPluginsBailResult("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);
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else if(statement.alternate)
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this.walkStatement(statement.alternate);
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}
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break;
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case "LabeledStatement":
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var result = this.applyPluginsBailResult("label " + statement.label.name, statement);
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if(result === true)
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break;
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this.walkStatement(statement.body);
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break;
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case "WithStatement":
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this.walkExpression(statement.object);
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this.walkStatement(statement.body);
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break;
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case "SwitchStatement":
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this.walkExpression(statement.discriminant);
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this.walkSwitchCases(statement.cases);
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break;
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case "ReturnStatement":
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case "ThrowStatement":
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if(statement.argument)
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this.walkExpression(statement.argument);
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break;
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case "TryStatement":
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if(this.scope.inTry) {
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this.walkStatement(statement.block);
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} else {
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this.scope.inTry = true;
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this.walkStatement(statement.block);
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this.scope.inTry = false;
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}
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this.walkCatchClauses(statement.handlers);
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if(statement.finalizer)
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this.walkStatement(statement.finalizer);
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break;
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case "WhileStatement":
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case "DoWhileStatement":
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this.walkExpression(statement.test);
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this.walkStatement(statement.body);
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break;
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case "ForStatement":
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if(statement.init) {
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if(statement.init.type === "VariableDeclaration")
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this.walkStatement(statement.init);
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else
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this.walkExpression(statement.init);
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}
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if(statement.test)
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this.walkExpression(statement.test);
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if(statement.update)
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this.walkExpression(statement.update);
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this.walkStatement(statement.body);
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break;
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case "ForInStatement":
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if(statement.left.type === "VariableDeclaration")
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this.walkStatement(statement.left);
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else
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this.walkExpression(statement.left);
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this.walkExpression(statement.right);
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this.walkStatement(statement.body);
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break;
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// Declarations
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case "FunctionDeclaration":
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this.scope.renames["$"+statement.id.name] = undefined;
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this.scope.definitions.push(statement.id.name);
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this.inScope(statement.params, function() {
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if(statement.body.type === "BlockStatement")
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this.walkStatement(statement.body);
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else
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this.walkExpression(statement.body);
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}.bind(this));
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break;
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case "VariableDeclaration":
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if(statement.declarations)
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this.walkVariableDeclarators(statement.declarations);
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break;
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}
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}
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Parser.prototype.walkSwitchCases = function walkSwitchCases(switchCases) {
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switchCases.forEach(function(switchCase) {
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if(switchCase.test)
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this.walkExpression(switchCase.test);
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this.walkStatements(switchCase.consequent);
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}, this);
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}
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Parser.prototype.walkCatchClauses = function walkCatchClauses(catchClauses) {
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catchClauses.forEach(function(catchClause) {
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if(catchClause.guard)
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this.walkExpression(catchClause.guard);
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this.inScope([catchClause.param], function() {
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this.walkStatement(catchClause.body);
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}.bind(this));
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}, this);
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}
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Parser.prototype.walkVariableDeclarators = function walkVariableDeclarators(declarators) {
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declarators.forEach(function(declarator) {
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switch(declarator.type) {
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case "VariableDeclarator":
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var initToIdentifier = declarator.init && declarator.init.type === "Identifier";
|
|
if(initToIdentifier && declarator.id.type === "Identifier" && !this.applyPluginsBailResult("rename " + declarator.init.name, declarator.init)) {
|
|
// renaming with "var a = b;"
|
|
this.scope.renames["$"+declarator.id.name] = this.scope.renames["$"+declarator.init.name] || declarator.init.name;
|
|
var idx = this.scope.definitions.indexOf(declarator.id.name);
|
|
if(idx >= 0) this.scope.definitions.splice(idx, 1);
|
|
} else if(declarator.id.type === "Identifier" && !this.applyPluginsBailResult("var " + declarator.id.name, declarator)) {
|
|
this.scope.renames["$"+declarator.id.name] = undefined;
|
|
this.scope.definitions.push(declarator.id.name);
|
|
if(declarator.init)
|
|
this.walkExpression(declarator.init);
|
|
} else {
|
|
this.walkExpression(declarator.id);
|
|
if(declarator.init)
|
|
this.walkExpression(declarator.init);
|
|
}
|
|
break;
|
|
}
|
|
}, this);
|
|
}
|
|
|
|
Parser.prototype.walkExpressions = function walkExpressions(expressions) {
|
|
expressions.forEach(function(expression) {
|
|
if(expression)
|
|
this.walkExpression(expression);
|
|
}, this);
|
|
}
|
|
|
|
Parser.prototype.walkExpression = function walkExpression(expression) {
|
|
switch(expression.type) {
|
|
case "ArrayExpression":
|
|
if(expression.elements)
|
|
this.walkExpressions(expression.elements);
|
|
break;
|
|
case "ObjectExpression":
|
|
expression.properties.forEach(function(prop) {
|
|
this.walkExpression(prop.value);
|
|
}, this);
|
|
break;
|
|
case "FunctionExpression":
|
|
this.inScope(expression.params, function() {
|
|
if(expression.body.type === "BlockStatement")
|
|
this.walkStatement(expression.body);
|
|
else
|
|
this.walkExpression(expression.body);
|
|
}.bind(this));
|
|
break;
|
|
case "SequenceExpression":
|
|
if(expression.expressions)
|
|
this.walkExpressions(expression.expressions);
|
|
break;
|
|
case "UpdateExpression":
|
|
this.walkExpression(expression.argument);
|
|
break;
|
|
case "UnaryExpression":
|
|
if(expression.operator === "typeof") {
|
|
var expr = expression.argument;
|
|
var exprName = [];
|
|
while(expr.type == "MemberExpression" && expr.property.type == "Identifier") {
|
|
exprName.unshift(expr.property.name);
|
|
expr = expr.object;
|
|
}
|
|
if(expr.type == "Identifier" && this.scope.definitions.indexOf(expr.name) == -1) {
|
|
exprName.unshift(this.scope.renames["$"+expr.name] || expr.name);
|
|
exprName = exprName.join(".");
|
|
var result = this.applyPluginsBailResult("typeof " + exprName, expression);
|
|
if(result === true)
|
|
break;
|
|
}
|
|
}
|
|
this.walkExpression(expression.argument);
|
|
break;
|
|
case "BinaryExpression":
|
|
case "LogicalExpression":
|
|
this.walkExpression(expression.left);
|
|
this.walkExpression(expression.right);
|
|
break;
|
|
case "AssignmentExpression":
|
|
if(expression.left.type === "Identifier" && expression.right.type === "Identifier" && !this.applyPluginsBailResult("rename " + expression.right.name, expression.right)) {
|
|
// renaming "a = b;"
|
|
this.scope.renames["$"+expression.left.name] = expression.right.name;
|
|
var idx = this.scope.definitions.indexOf(expression.left.name);
|
|
if(idx >= 0) this.scope.definitions.splice(idx, 1);
|
|
} else if(expression.left.type === "Identifier") {
|
|
if(!this.applyPluginsBailResult("assigned " + expression.left.name, expression)) {
|
|
this.walkExpression(expression.right);
|
|
}
|
|
this.scope.renames["$"+expression.left.name] = undefined;
|
|
if(!this.applyPluginsBailResult("assign " + expression.left.name, expression)) {
|
|
this.walkExpression(expression.left);
|
|
}
|
|
} else {
|
|
this.walkExpression(expression.right);
|
|
this.scope.renames["$"+expression.left.name] = undefined;
|
|
this.walkExpression(expression.left);
|
|
}
|
|
break;
|
|
case "ConditionalExpression":
|
|
var result = this.applyPluginsBailResult("expression ?:", expression);
|
|
if(result === undefined) {
|
|
this.walkExpression(expression.test);
|
|
this.walkExpression(expression.consequent);
|
|
if(expression.alternate)
|
|
this.walkExpression(expression.alternate);
|
|
} else {
|
|
if(result)
|
|
this.walkExpression(expression.consequent);
|
|
else if(expression.alternate)
|
|
this.walkExpression(expression.alternate);
|
|
}
|
|
break;
|
|
case "NewExpression":
|
|
this.walkExpression(expression.callee);
|
|
if(expression.arguments)
|
|
this.walkExpressions(expression.arguments);
|
|
break;
|
|
case "CallExpression":
|
|
function walkIIFE(functionExpression, args) {
|
|
var params = functionExpression.params;
|
|
var args = args.map(function(arg, idx) {
|
|
var result = this.evaluateExpression(arg);
|
|
if(result && !result.isIdentifier()) result = undefined;
|
|
if(!result) {
|
|
this.walkExpression(arg);
|
|
return;
|
|
} else if(this.applyPluginsBailResult("rename " + result.identifier, arg)) {
|
|
return;
|
|
}
|
|
return result.identifier;
|
|
}, this);
|
|
this.inScope(params.filter(function(identifier, idx) {
|
|
return !args[idx];
|
|
}), function() {
|
|
args.forEach(function(arg, idx) {
|
|
if(!arg) return;
|
|
if(params[idx].type !== "Identifier") return;
|
|
this.scope.renames["$"+params[idx].name] = arg;
|
|
}, this);
|
|
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.property.type === "Identifier" && ["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 {
|
|
|
|
var callee = this.evaluateExpression(expression.callee);
|
|
if(callee.isIdentifier()) {
|
|
var result = this.applyPluginsBailResult("call " + callee.identifier, expression);
|
|
if(result === true)
|
|
break;
|
|
}
|
|
|
|
if(expression.callee)
|
|
this.walkExpression(expression.callee);
|
|
if(expression.arguments)
|
|
this.walkExpressions(expression.arguments);
|
|
}
|
|
break;
|
|
case "MemberExpression":
|
|
var expr = expression;
|
|
var exprName = [];
|
|
while(expr.type == "MemberExpression" && expr.property.type == "Identifier") {
|
|
exprName.unshift(expr.property.name);
|
|
expr = expr.object;
|
|
}
|
|
if(expr.type == "Identifier" && this.scope.definitions.indexOf(expr.name) == -1) {
|
|
exprName.unshift(this.scope.renames["$"+expr.name] || expr.name);
|
|
exprName = exprName.join(".");
|
|
var result = this.applyPluginsBailResult("expression " + exprName, expression);
|
|
if(result === true)
|
|
break;
|
|
}
|
|
this.walkExpression(expression.object);
|
|
if(expression.property.type !== "Identifier")
|
|
this.walkExpression(expression.property);
|
|
break;
|
|
case "Identifier":
|
|
if(this.scope.definitions.indexOf(expression.name) == -1) {
|
|
var result = this.applyPluginsBailResult("expression " + (this.scope.renames["$"+expression.name] || expression.name), expression);
|
|
if(result === true)
|
|
break;
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
|
|
Parser.prototype.inScope = function inScope(params, fn) {
|
|
var oldScope = this.scope;
|
|
this.scope = {
|
|
inTry: false,
|
|
definitions: oldScope.definitions.slice(),
|
|
renames: Object.create(oldScope.renames)
|
|
};
|
|
params.forEach(function(param) {
|
|
if(typeof param !== "string") {
|
|
if(param.type !== "Identifier")
|
|
return;
|
|
param = param.name;
|
|
}
|
|
this.scope.renames["$"+param] = undefined;
|
|
this.scope.definitions.push(param);
|
|
}, this);
|
|
fn();
|
|
this.scope = oldScope;
|
|
}
|
|
|
|
Parser.prototype.evaluateExpression = function evaluateExpression(expression) {
|
|
var result = this.applyPluginsBailResult("evaluate " + expression.type, expression);
|
|
if(result !== undefined)
|
|
return result;
|
|
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+""};
|
|
break;
|
|
}
|
|
return {value: "", code: true};
|
|
}
|
|
|
|
Parser.prototype.parseStringArray = function parseStringArray(expression) {
|
|
switch(expression.type) {
|
|
case "ArrayExpression":
|
|
var arr = [];
|
|
if(expression.elements)
|
|
expression.elements.forEach(function(expr) {
|
|
arr.push(this.parseString(expr));
|
|
}, this);
|
|
return arr;
|
|
}
|
|
return [this.parseString(expression)];
|
|
}
|
|
|
|
Parser.prototype.parseCalculatedStringArray = function parseCalculatedStringArray(expression) {
|
|
switch(expression.type) {
|
|
case "ArrayExpression":
|
|
var arr = [];
|
|
if(expression.elements)
|
|
expression.elements.forEach(function(expr) {
|
|
arr.push(this.parseCalculatedString(expr));
|
|
}, this);
|
|
return arr;
|
|
}
|
|
return [this.parseCalculatedString(expression)];
|
|
}
|
|
|
|
Parser.prototype.parse = function parse(source, initialState) {
|
|
var ast = esprima.parse(source, {range: true, loc: true, raw: true});
|
|
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) === undefined)
|
|
this.walkStatements(ast.body);
|
|
this.scope = oldScope;
|
|
this.state = oldState;
|
|
return state;
|
|
}
|
|
|
|
Parser.prototype.evaluate = function evaluate(source) {
|
|
var ast = esprima.parse("("+source+")", {range: true, loc: true, raw: 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);
|
|
};
|