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// Copyright 2007 The Closure Library Authors. All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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//      http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS-IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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/**
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 * @fileoverview DOM pattern to match any children of a tag.
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 *
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 * @author [email protected] (Robby Walker)
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 */
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goog.provide('goog.dom.pattern.AllChildren');
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goog.require('goog.dom.pattern.AbstractPattern');
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goog.require('goog.dom.pattern.MatchType');
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/**
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 * Pattern object that matches any nodes at or below the current tree depth.
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 *
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 * @constructor
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 * @extends {goog.dom.pattern.AbstractPattern}
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 */
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goog.dom.pattern.AllChildren = function() {
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  /**
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   * Tracks the matcher's depth to detect the end of the tag.
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   *
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   * @private {number}
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   */
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  this.depth_ = 0;
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};
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goog.inherits(goog.dom.pattern.AllChildren, goog.dom.pattern.AbstractPattern);
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/**
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 * Test whether the given token is on the same level.
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 *
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 * @param {Node} token Token to match against.
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 * @param {goog.dom.TagWalkType} type The type of token.
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 * @return {goog.dom.pattern.MatchType} {@code MATCHING} if the token is on the
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 *     same level or deeper and {@code BACKTRACK_MATCH} if not.
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 * @override
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 */
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goog.dom.pattern.AllChildren.prototype.matchToken = function(token, type) {
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  this.depth_ += type;
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  if (this.depth_ >= 0) {
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    return goog.dom.pattern.MatchType.MATCHING;
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  } else {
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    this.depth_ = 0;
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    return goog.dom.pattern.MatchType.BACKTRACK_MATCH;
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  }
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};
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/**
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 * Reset any internal state this pattern keeps.
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 * @override
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 */
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goog.dom.pattern.AllChildren.prototype.reset = function() {
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  this.depth_ = 0;
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};
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