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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 and all of its children.
*
* @author robbyw@google.com (Robby Walker)
*/
goog.provide('goog.dom.pattern.Repeat');
goog.require('goog.dom.NodeType');
goog.require('goog.dom.pattern.AbstractPattern');
goog.require('goog.dom.pattern.MatchType');
/**
* Pattern object that matches a repetition of another pattern.
* @param {goog.dom.pattern.AbstractPattern} pattern The pattern to
* repetitively match.
* @param {number=} opt_minimum The minimum number of times to match. Defaults
* to 0.
* @param {number=} opt_maximum The maximum number of times to match. Defaults
* to unlimited.
* @constructor
* @extends {goog.dom.pattern.AbstractPattern}
*/
goog.dom.pattern.Repeat = function(pattern,
opt_minimum,
opt_maximum) {
this.pattern_ = pattern;
this.minimum_ = opt_minimum || 0;
this.maximum_ = opt_maximum || null;
this.matches = [];
};
goog.inherits(goog.dom.pattern.Repeat, goog.dom.pattern.AbstractPattern);
/**
* Pattern to repetitively match.
*
* @type {goog.dom.pattern.AbstractPattern}
* @private
*/
goog.dom.pattern.Repeat.prototype.pattern_;
/**
* Minimum number of times to match the pattern.
*
* @private
*/
goog.dom.pattern.Repeat.prototype.minimum_ = 0;
/**
* Optional maximum number of times to match the pattern. A {@code null} value
* will be treated as infinity.
*
* @type {?number}
* @private
*/
goog.dom.pattern.Repeat.prototype.maximum_ = 0;
/**
* Number of times the pattern has matched.
*
* @type {number}
*/
goog.dom.pattern.Repeat.prototype.count = 0;
/**
* Whether the pattern has recently matched or failed to match and will need to
* be reset when starting a new round of matches.
*
* @type {boolean}
* @private
*/
goog.dom.pattern.Repeat.prototype.needsReset_ = false;
/**
* The matched nodes.
*
* @type {Array.<Node>}
*/
goog.dom.pattern.Repeat.prototype.matches;
/**
* Test whether the given token continues a repeated series of matches of the
* pattern given 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>BACKTRACK_MATCH</code> if the pattern does not match
* but already had accumulated matches, <code>MATCHING</code> if the pattern
* starts a match, and <code>NO_MATCH</code> if the pattern does not match.
* @suppress {missingProperties} See the broken line below.
* @override
*/
goog.dom.pattern.Repeat.prototype.matchToken = function(token, type) {
// Reset if we're starting a new match
if (this.needsReset_) {
this.reset();
}
// If the option is set, ignore any whitespace only text nodes
if (token.nodeType == goog.dom.NodeType.TEXT &&
token.nodeValue.match(/^\s+$/)) {
return goog.dom.pattern.MatchType.MATCHING;
}
switch (this.pattern_.matchToken(token, type)) {
case goog.dom.pattern.MatchType.MATCH:
// Record the first token we match.
if (this.count == 0) {
this.matchedNode = token;
}
// Mark the match
this.count++;
// Add to the list
this.matches.push(this.pattern_.matchedNode);
// Check if this match hits our maximum
if (this.maximum_ !== null && this.count == this.maximum_) {
this.needsReset_ = true;
return goog.dom.pattern.MatchType.MATCH;
} else {
return goog.dom.pattern.MatchType.MATCHING;
}
case goog.dom.pattern.MatchType.MATCHING:
// This can happen when our child pattern is a sequence or a repetition.
return goog.dom.pattern.MatchType.MATCHING;
case goog.dom.pattern.MatchType.BACKTRACK_MATCH:
// This happens if our child pattern is repetitive too.
// TODO(robbyw): Backtrack further if necessary.
this.count++;
// NOTE(nicksantos): This line of code is broken. this.patterns_ doesn't
// exist, and this.currentPosition_ doesn't exit. When this is fixed,
// remove the missingProperties suppression above.
if (this.currentPosition_ == this.patterns_.length) {
this.needsReset_ = true;
return goog.dom.pattern.MatchType.BACKTRACK_MATCH;
} else {
// Retry the same token on the next iteration of the child pattern.
return this.matchToken(token, type);
}
default:
this.needsReset_ = true;
if (this.count >= this.minimum_) {
return goog.dom.pattern.MatchType.BACKTRACK_MATCH;
} else {
return goog.dom.pattern.MatchType.NO_MATCH;
}
}
};
/**
* Reset any internal state this pattern keeps.
* @override
*/
goog.dom.pattern.Repeat.prototype.reset = function() {
this.pattern_.reset();
this.count = 0;
this.needsReset_ = false;
this.matches.length = 0;
};
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