/*
 *
 *  Licensed to the Apache Software Foundation (ASF) under one or more
 *  contributor license agreements.  See the NOTICE file distributed with
 *  this work for additional information regarding copyright ownership.
 *  The ASF licenses this file to You under the Apache License, Version 2.0
 *  (the "License"); you may not use this file except in compliance with
 *  the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 *
 */

package org.apache.flex.compiler.internal.mxml;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

import org.apache.flex.compiler.mxml.IMXMLInstructionData;
import org.apache.flex.compiler.parsing.IMXMLToken;

public class MXMLInstructionData extends MXMLUnitData implements
        IMXMLInstructionData
{
    private static Pattern WHITESPACE = Pattern.compile("[ \t\r\n]+");
    
    /**
     * Constructor.
     */
    MXMLInstructionData(IMXMLToken token)
    {
        instructionText = token.getText();
        
        Matcher m = WHITESPACE.matcher(instructionText);
        if (m.find())
        {
            targetEndIndex = m.start();
            contentStartIndex = m.end();
        }
        else
        {
            targetEndIndex = instructionText.length() - 2;
            contentStartIndex = instructionText.length() - 2;
        }
        

        setOffsets(token.getStart(), token.getEnd());
        setColumn(token.getColumn());
        setLine(token.getLine());
    }

    private String instructionText;
    
    private int targetEndIndex;
    
    private int contentStartIndex;

    //
    // Object overrides
    //

    // For debugging only. This format is nice in the Eclipse debugger.
    @Override
    public String toString()
    {
        StringBuilder sb = new StringBuilder();

        sb.append('|');
        sb.append(getInstructionText());
        sb.append('|');

        sb.append(' ');

        // Display line, column, start, and end as "17:5 160-188".
        sb.append(super.toString());

        return sb.toString();
    }

    //
    // MXMLUnitData overrides
    //

    // For debugging only. This format is nice in a text file.
    @Override
    public String toDumpString()
    {
        StringBuilder sb = new StringBuilder();

        sb.append(super.toDumpString());

        sb.append('\t');

        sb.append('"');
        sb.append(getInstructionText());
        sb.append('"');

        return sb.toString();
    }

    //
    // IMXMLInstructionData implementations
    //

    /**
     * Returns the raw processing instruction. It is up to clients to parse
     * this.
     */
    public String getInstructionText()
    {
        return instructionText;
    }
    
    public String getTarget()
    {
        return instructionText.substring(2, targetEndIndex);
    }
    
    public String getContent()
    {
        return instructionText.substring(contentStartIndex, instructionText.length() - 2);
    }
}