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// Copyright 2020 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
/**
* @fileoverview Variables mutator.
*/
'use strict';
const babelTypes = require('@babel/types');
const common = require('./common.js');
const random = require('../random.js');
const mutator = require('./mutator.js');
function _isInFunctionParam(path) {
const child = path.find(p => p.parent && babelTypes.isFunction(p.parent));
return child && child.parentKey === 'params';
}
class VariableMutator extends mutator.Mutator {
constructor(settings) {
super();
this.settings = settings;
}
get visitor() {
const thisMutator = this;
return {
Identifier(path) {
if (!random.choose(thisMutator.settings.MUTATE_VARIABLES)) {
return;
}
if (!common.isVariableIdentifier(path.node.name)) {
return;
}
// Don't mutate variables that are being declared.
if (babelTypes.isVariableDeclarator(path.parent)) {
return;
}
// Don't mutate function params.
if (_isInFunctionParam(path)) {
return;
}
if (common.isInForLoopCondition(path) ||
common.isInWhileLoop(path)) {
return;
}
const randVar = common.randomVariable(path);
if (!randVar) {
return;
}
const newName = randVar.name;
thisMutator.annotate(
path.node,
`Replaced ${path.node.name} with ${newName}`);
path.node.name = newName;
}
};
}
}
module.exports = {
VariableMutator: VariableMutator,
};
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