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.NotRange;
    19  import org.as2lib.regexp.node.TreeInfo;
    20  
    21  /**
    22   * {@code Range} is anode class for matching characters within an explicit 
    23   * value range.
    24   * 
    25   * @author Igor Sadovskiy
    26   */
    27   
    28  class org.as2lib.regexp.node.Range extends Node {
    29  	
    30      private var lower, upper:Number;
    31      
    32      public function Range(n:Number) {
    33      	if (n != null) {
    34  	        lower = n >>> 16;
    35  	        upper = n & 0xFFFF;
    36      	}
    37      }
    38      
    39      public function dup(flag:Boolean):Node {
    40          return (flag) ? 
    41          	new NotRange((lower << 16) + upper) :
    42              new Range((lower << 16) + upper);
    43      }
    44      
    45      public function match(matcher:Object, i:Number, seq:String):Boolean {
    46          if (i < matcher.to) {
    47              var ch:Number = seq.charCodeAt(i);
    48              return ((ch-lower)|(upper-ch)) >= 0 && next.match(matcher, i+1, seq);
    49          }
    50          return false;
    51      }
    52      
    53      public function study(info:TreeInfo):Boolean {
    54          info.minLength++;
    55          info.maxLength++;
    56          return next.study(info);
    57      }
    58  }
    59  
    60
as2api