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BackRefNode.java

/*
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 * this software and associated documentation files (the "Software"), to deal in 
 * the Software without restriction, including without limitation the rights to 
 * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies 
 * of the Software, and to permit persons to whom the Software is furnished to do
 * so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 
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package org.joni.ast;

import org.joni.ScanEnvironment;
import org.joni.exception.ErrorMessages;
import org.joni.exception.ValueException;

00026 public final class BackRefNode extends StateNode {
    //private static int NODE_BACKREFS_SIZE = 6; 
    
    //int state;
    public int backNum;
    public int back[];
    
    public int nestLevel;
    
    public BackRefNode(int backNum, int[]backRefs, boolean byName, ScanEnvironment env) {
        this.backNum = backNum;
        if (byName) setNameRef();
        
        for (int i=0; i<backNum; i++) {
            if (backRefs[i] <= env.numMem && env.memNodes[backRefs[i]] == null) {
                setRecursion(); /* /...(\1).../ */
                break;
            }
        }
        
        back = new int[backNum];
        System.arraycopy(backRefs, 0, back, 0, backNum); // shall we really dup it ???
    }
    
    // #ifdef USE_BACKREF_AT_LEVEL
    public BackRefNode(int backNum, int[]backRefs, boolean byName, boolean existLevel, int nestLevel, ScanEnvironment env) {
        this(backNum, backRefs, byName, env);
        
        if (existLevel) {
            //state |= NST_NEST_LEVEL;
            setNestLevel();
            this.nestLevel = nestLevel;
        }
    }
    
    @Override
    public int getType() {
        return BREF;
    }   
    
    @Override
    public String getName() {
        return "Back Ref";
    }   

    @Override
    public String toString(int level) {
        StringBuilder value = new StringBuilder(super.toString(level));
        value.append("\n  backNum: " + backNum);
        String backs = "";
        for (int i=0; i<back.length; i++) backs += back[i] + ", ";
        value.append("\n  back: " + backs);
        value.append("\n  nextLevel: " + nestLevel);
        return value.toString();
    }
    
    public void renumber(int[]map) {
        if (!isNameRef()) throw new ValueException(ErrorMessages.ERR_NUMBERED_BACKREF_OR_CALL_NOT_ALLOWED);
        
        int oldNum = backNum;
        
        int pos = 0;
        for (int i=0; i<oldNum; i++) {
            int n = map[back[i]];
            if (n > 0) {
                back[pos] = n;
                pos++;
            }
        }
        backNum = pos;
    }
    
}

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