1  /*
     2   * Copyright the original author or authors.
     3   * 
     4   * Licensed under the MOZILLA PUBLIC LICENSE, Version 1.1 (the "License");
     5   * you may not use this file except in compliance with the License.
     6   * You may obtain a copy of the License at
     7   * 
     8   *      http://www.mozilla.org/MPL/MPL-1.1.html
     9   * 
    10   * Unless required by applicable law or agreed to in writing, software
    11   * distributed under the License is distributed on an "AS IS" BASIS,
    12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13   * See the License for the specific language governing permissions and
    14   * limitations under the License.
    15   */
    16   
    17  import org.as2lib.regexp.node.Node; 
    18  import org.as2lib.regexp.node.GroupHead;
    19  import org.as2lib.regexp.node.TreeInfo;
    20  
    21  /**
    22   * {@code GroupRef}  is a recursive reference to a group in the regular 
    23   * expression. It calls matchRef because if the reference fails to match 
    24   * we would not unset the group.
    25   * 
    26   * @author Igor Sadovskiy
    27   */
    28   
    29  class org.as2lib.regexp.node.GroupRef extends Node {
    30  	
    31      private var head:GroupHead;
    32      
    33      public function GroupRef(head:GroupHead) {
    34          this.head = head;
    35      }
    36      
    37      public function match(matcher:Object, i:Number, seq:String):Boolean {
    38          return head.matchRef(matcher, i, seq)
    39              && next.match(matcher, matcher.last, seq);
    40      }
    41      
    42      public function study(info:TreeInfo):Boolean {
    43          info.maxValid = false;
    44          info.deterministic = false;
    45          return next.study(info);
    46      }
    47  }
    48  
    49
as2api