Adding float-no-zero branch hosted build

float-no-zero/closure-library/closure/goog/dom/pattern/sequence.js

@@ -0,0 +1,141 @@
+// 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 sequence of other patterns.
+ *
+ * @author robbyw@google.com (Robby Walker)
+ */
+
+goog.provide('goog.dom.pattern.Sequence');
+
+goog.require('goog.dom.NodeType');
+goog.require('goog.dom.pattern.AbstractPattern');
+goog.require('goog.dom.pattern.MatchType');
+
+
+
+/**
+ * Pattern object that matches a sequence of other patterns.
+ *
+ * @param {Array.<goog.dom.pattern.AbstractPattern>} patterns Ordered array of
+ *     patterns to match.
+ * @param {boolean=} opt_ignoreWhitespace Optional flag to ignore text nodes
+ *     consisting entirely of whitespace.  The default is to not ignore them.
+ * @constructor
+ * @extends {goog.dom.pattern.AbstractPattern}
+ */
+goog.dom.pattern.Sequence = function(patterns, opt_ignoreWhitespace) {
+  this.patterns = patterns;
+  this.ignoreWhitespace_ = !!opt_ignoreWhitespace;
+};
+goog.inherits(goog.dom.pattern.Sequence, goog.dom.pattern.AbstractPattern);
+
+
+/**
+ * Ordered array of patterns to match.
+ *
+ * @type {Array.<goog.dom.pattern.AbstractPattern>}
+ */
+goog.dom.pattern.Sequence.prototype.patterns;
+
+
+/**
+ * Position in the patterns array we have reached by successful matches.
+ *
+ * @type {number}
+ * @private
+ */
+goog.dom.pattern.Sequence.prototype.currentPosition_ = 0;
+
+
+/**
+ * Whether or not to ignore whitespace only Text nodes.
+ *
+ * @type {boolean}
+ * @private
+ */
+goog.dom.pattern.Sequence.prototype.ignoreWhitespace_ = false;
+
+
+/**
+ * Test whether the given token starts, continues, or finishes the sequence
+ * of patterns 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>MATCHING</code> if the pattern starts a match, and
+ *     <code>NO_MATCH</code> if the pattern does not match.
+ * @override
+ */
+goog.dom.pattern.Sequence.prototype.matchToken = function(token, type) {
+  // If the option is set, ignore any whitespace only text nodes
+  if (this.ignoreWhitespace_ && token.nodeType == goog.dom.NodeType.TEXT &&
+      goog.dom.pattern.BREAKING_TEXTNODE_RE.test(token.nodeValue)) {
+    return goog.dom.pattern.MatchType.MATCHING;
+  }
+
+  switch (this.patterns[this.currentPosition_].matchToken(token, type)) {
+    case goog.dom.pattern.MatchType.MATCH:
+      // Record the first token we match.
+      if (this.currentPosition_ == 0) {
+        this.matchedNode = token;
+      }
+
+      // Move forward one position.
+      this.currentPosition_++;
+
+      // Check if this is the last position.
+      if (this.currentPosition_ == this.patterns.length) {
+        this.reset();
+        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 means a repetitive match succeeded 1 token ago.
+      // TODO(robbyw): Backtrack further if necessary.
+      this.currentPosition_++;
+
+      if (this.currentPosition_ == this.patterns.length) {
+        this.reset();
+        return goog.dom.pattern.MatchType.BACKTRACK_MATCH;
+      } else {
+        // Retry the same token on the next pattern.
+        return this.matchToken(token, type);
+      }
+
+    default:
+      this.reset();
+      return goog.dom.pattern.MatchType.NO_MATCH;
+  }
+};
+
+
+/**
+ * Reset any internal state this pattern keeps.
+ * @override
+ */
+goog.dom.pattern.Sequence.prototype.reset = function() {
+  if (this.patterns[this.currentPosition_]) {
+    this.patterns[this.currentPosition_].reset();
+  }
+  this.currentPosition_ = 0;
+};