Demo/bin/Debug/front_end/script_formatter_worker/ESTreeWalker.js

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// Copyright (c) 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

/**
 * @constructor
 * @param {function(!ESTree.Node)} beforeVisit
 * @param {function(!ESTree.Node)} afterVisit
 */
FormatterWorker.ESTreeWalker = function(beforeVisit, afterVisit)
{
    this._beforeVisit = beforeVisit;
    this._afterVisit = afterVisit;
}

FormatterWorker.ESTreeWalker.prototype = {
    /**
     * @param {!ESTree.Node} ast
     */
    walk: function(ast)
    {
        this._innerWalk(ast, null);
    },

    /**
     * @param {!ESTree.Node} node
     * @param {?ESTree.Node} parent
     */
    _innerWalk: function(node, parent)
    {
        if (!node)
            return;
        node.parent = parent;

        this._beforeVisit.call(null, node);

        var walkOrder = FormatterWorker.ESTreeWalker._walkOrder[node.type];
        if (!walkOrder) {
            console.error("Walk order not defined for " + node.type);
            return;
        }

        if (node.type === "TemplateLiteral") {
            var templateLiteral = /** @type {!ESTree.TemplateLiteralNode} */ (node);
            var expressionsLength = templateLiteral.expressions.length;
            for (var i = 0; i < expressionsLength; ++i) {
                this._innerWalk(templateLiteral.quasis[i], templateLiteral);
                this._innerWalk(templateLiteral.expressions[i], templateLiteral);
            }
            this._innerWalk(templateLiteral.quasis[expressionsLength], templateLiteral);
        } else {
            for (var i = 0; i < walkOrder.length; ++i) {
                var entity = node[walkOrder[i]];
                if (Array.isArray(entity))
                    this._walkArray(entity, node);
                else
                    this._innerWalk(entity, node);
            }
        }