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// Copyright 2007 The Closure Library Authors. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS-IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
/**
* @fileoverview DOM pattern to match a tag.
*
* @author robbyw@google.com (Robby Walker)
*/
goog.provide('goog.dom.pattern.Tag');
goog.require('goog.dom.pattern');
goog.require('goog.dom.pattern.AbstractPattern');
goog.require('goog.dom.pattern.MatchType');
goog.require('goog.object');
/**
* Pattern object that matches an tag.
*
* @param {string|RegExp} tag Name of the tag. Also will accept a regular
* expression to match against the tag name.
* @param {goog.dom.TagWalkType} type Type of token to match.
* @param {Object=} opt_attrs Optional map of attribute names to desired values.
* This pattern will only match when all attributes are present and match
* the string or regular expression value provided here.
* @param {Object=} opt_styles Optional map of CSS style names to desired
* values. This pattern will only match when all styles are present and
* match the string or regular expression value provided here.
* @param {Function=} opt_test Optional function that takes the element as a
* parameter and returns true if this pattern should match it.
* @constructor
* @extends {goog.dom.pattern.AbstractPattern}
*/
goog.dom.pattern.Tag = function(tag, type, opt_attrs, opt_styles, opt_test) {
if (goog.isString(tag)) {
this.tag_ = tag.toUpperCase();
} else {
this.tag_ = tag;
}
this.type_ = type;
this.attrs_ = opt_attrs || null;
this.styles_ = opt_styles || null;
this.test_ = opt_test || null;
};
goog.inherits(goog.dom.pattern.Tag, goog.dom.pattern.AbstractPattern);
/**
* The tag to match.
*
* @type {string|RegExp}
* @private
*/
goog.dom.pattern.Tag.prototype.tag_;
/**
* The type of token to match.
*
* @type {goog.dom.TagWalkType}
* @private
*/
goog.dom.pattern.Tag.prototype.type_;
/**
* The attributes to test for.
*
* @type {Object}
* @private
*/
goog.dom.pattern.Tag.prototype.attrs_ = null;
/**
* The styles to test for.
*
* @type {Object}
* @private
*/
goog.dom.pattern.Tag.prototype.styles_ = null;
/**
* Function that takes the element as a parameter and returns true if this
* pattern should match it.
*
* @type {Function}
* @private
*/
goog.dom.pattern.Tag.prototype.test_ = null;
/**
* Test whether the given token is a tag token which matches the tag name,
* style, and attributes provided in the constructor.
*
* @param {Node} token Token to match against.
* @param {goog.dom.TagWalkType} type The type of token.
* @return {goog.dom.pattern.MatchType} <code>MATCH</code> if the pattern
* matches, <code>NO_MATCH</code> otherwise.
* @override
*/
goog.dom.pattern.Tag.prototype.matchToken = function(token, type) {
// Check the direction and tag name.
if (type == this.type_ &&
goog.dom.pattern.matchStringOrRegex(this.tag_, token.nodeName)) {
// Check the attributes.
if (this.attrs_ &&
!goog.object.every(
this.attrs_,
goog.dom.pattern.matchStringOrRegexMap,
token)) {
return goog.dom.pattern.MatchType.NO_MATCH;
}
// Check the styles.
if (this.styles_ &&
!goog.object.every(
this.styles_,
goog.dom.pattern.matchStringOrRegexMap,
token.style)) {
return goog.dom.pattern.MatchType.NO_MATCH;
}
if (this.test_ && !this.test_(token)) {
return goog.dom.pattern.MatchType.NO_MATCH;
}
// If we reach this point, we have a match and should save it.
this.matchedNode = token;
return goog.dom.pattern.MatchType.MATCH;
}
return goog.dom.pattern.MatchType.NO_MATCH;
};
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