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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 Mutator
*/
'use strict';
const babelTraverse = require('@babel/traverse').default;
const babelTypes = require('@babel/types');
class Mutator {
get visitor() {
return null;
}
_traverse(ast, visitor) {
let oldEnter = null;
if (Object.prototype.hasOwnProperty.call(visitor, 'enter')) {
oldEnter = visitor['enter'];
}
// Transparently skip nodes that are marked.
visitor['enter'] = (path) => {
if (this.shouldSkip(path.node)) {
path.skip();
return;
}
if (oldEnter) {
oldEnter(path);
}
}
babelTraverse(ast, visitor);
}
mutate(source) {
if (Array.isArray(this.visitor)) {
for (const visitor of this.visitor) {
this._traverse(source.ast, visitor);
}
} else {
this._traverse(source.ast, this.visitor);
}
}
get _skipPropertyName() {
return '__skip' + this.constructor.name;
}
shouldSkip(node) {
return Boolean(node[this._skipPropertyName]);
}
skipMutations(node) {
// Mark a node to skip further mutations of the same kind.
if (Array.isArray(node)) {
for (const item of node) {
item[this._skipPropertyName] = true;
}
} else {
node[this._skipPropertyName] = true;
}
return node;
}
insertBeforeSkip(path, node) {
this.skipMutations(node);
path.insertBefore(node);
}
insertAfterSkip(path, node) {
this.skipMutations(node);
path.insertAfter(node);
}
replaceWithSkip(path, node) {
this.skipMutations(node);
path.replaceWith(node);
}
replaceWithMultipleSkip(path, node) {
this.skipMutations(node);
path.replaceWithMultiple(node);
}
annotate(node, message) {
babelTypes.addComment(
node, 'leading', ` ${this.constructor.name}: ${message} `);
}
}
module.exports = {
Mutator: Mutator,
}
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