1 /* 2 * Permission is hereby granted, free of charge, to any person obtaining a copy of 3 * this software and associated documentation files (the "Software"), to deal in 4 * the Software without restriction, including without limitation the rights to 5 * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies 6 * of the Software, and to permit persons to whom the Software is furnished to do 7 * so, subject to the following conditions: 8 * 9 * The above copyright notice and this permission notice shall be included in all 10 * copies or substantial portions of the Software. 11 * 12 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 13 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 14 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 15 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 16 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 17 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 18 * SOFTWARE. 19 */ 20 package jdk.nashorn.internal.runtime.regexp.joni.ast; 21 22 import jdk.nashorn.internal.runtime.regexp.joni.ScanEnvironment; 23 24 @SuppressWarnings("javadoc") 25 public final class BackRefNode extends StateNode { 26 public final int backRef; 27 28 public BackRefNode(final int backRef, final ScanEnvironment env) { 29 this.backRef = backRef; 30 31 if (backRef <= env.numMem && env.memNodes[backRef] == null) { 32 setRecursion(); /* /...(\1).../ */ 33 } 34 } 35 36 @Override 37 public int getType() { 38 return BREF; 39 } 40 41 @Override 42 public String getName() { 43 return "Back Ref"; 44 } 45 46 @Override 47 public String toString(final int level) { 48 final StringBuilder value = new StringBuilder(super.toString(level)); 49 value.append("\n back: ").append(backRef); 50 return value.toString(); 51 } 52 }