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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 Useful callback functions for the DOM matcher.
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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.callback');
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goog.require('goog.dom');
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goog.require('goog.dom.TagWalkType');
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goog.require('goog.iter');
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/**
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 * Callback function for use in {@link goog.dom.pattern.Matcher.addPattern}
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 * that removes the matched node from the tree.  Should be used in conjunciton
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 * with a {@link goog.dom.pattern.StartTag} pattern.
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 *
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 * @param {Node} node The node matched by the pattern.
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 * @param {goog.dom.TagIterator} position The position where the match
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 *     finished.
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 * @return {boolean} Returns true to indicate tree changes were made.
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 */
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goog.dom.pattern.callback.removeNode = function(node, position) {
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  // Find out which position would be next.
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  position.setPosition(node, goog.dom.TagWalkType.END_TAG);
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  goog.iter.nextOrValue(position, null);
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  // Remove the node.
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  goog.dom.removeNode(node);
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  // Correct for the depth change.
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  position.depth -= 1;
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  // Indicate that we made position/tree changes.
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  return true;
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};
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/**
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 * Callback function for use in {@link goog.dom.pattern.Matcher.addPattern}
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 * that removes the matched node from the tree and replaces it with its
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 * children.  Should be used in conjunction with a
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 * {@link goog.dom.pattern.StartTag} pattern.
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 *
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 * @param {Element} node The node matched by the pattern.
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 * @param {goog.dom.TagIterator} position The position where the match
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 *     finished.
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 * @return {boolean} Returns true to indicate tree changes were made.
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 */
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goog.dom.pattern.callback.flattenElement = function(node, position) {
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  // Find out which position would be next.
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  position.setPosition(
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      node, node.firstChild ? goog.dom.TagWalkType.START_TAG :
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                              goog.dom.TagWalkType.END_TAG);
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  goog.iter.nextOrValue(position, null);
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  // Flatten the node.
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  goog.dom.flattenElement(node);
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  // Correct for the depth change.
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  position.depth -= 1;
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  // Indicate that we made position/tree changes.
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  return true;
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};
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