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.Add; 
    19  import org.as2lib.regexp.node.TreeInfo;
    20   
    21  /**
    22   * {@code Sub} is a class represented an object added to the tree when a 
    23   * character class has a range or single subtracted from it.
    24   * 
    25   * @author Igor Sadovskiy
    26   */
    27   
    28  class org.as2lib.regexp.node.Sub extends Add  {
    29  	
    30      public function Sub(lhs:Node, rhs:Node) {
    31          super(lhs, rhs);
    32      }
    33      
    34      public function match(matcher:Object, i:Number, seq:String):Boolean {
    35          if (i < matcher.to)
    36              return !rhs.match(matcher, i, seq)
    37                  && lhs.match(matcher, i, seq)
    38                  && next.match(matcher, matcher.last, seq);
    39          return false;
    40      }
    41      
    42      public function study(info:TreeInfo):Boolean {
    43          lhs.study(info);
    44          return next.study(info);
    45      }
    46  }
    47  
    48
as2api