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  
    19  /**
    20   * {@code Behind} is used for zero-width positive lookbehind.
    21   * 
    22   * @author Igor Sadovskiy
    23   */
    24  
    25   
    26  class org.as2lib.regexp.node.Behind extends Node {
    27  	
    28      private var cond:Node;
    29      private var rmax, rmin:Number;
    30      
    31      public function Behind(cond:Node, rmax:Number, rmin:Number) {
    32          this.cond = cond;
    33          this.rmax = rmax;
    34          this.rmin = rmin;
    35      }
    36      
    37      public function match(matcher:Object, i:Number, seq:String):Boolean {
    38          var from:Number = Math.max(i - rmax, matcher.from);
    39          for (var j:Number = i - rmin; j >= from; j--) {
    40              if (cond.match(matcher, j, seq) && matcher.last == i) {
    41                  return next.match(matcher, i, seq);
    42              }
    43          }
    44          return false;
    45      }
    46  }
    47  
    48
as2api