/*******************************************************************************
 * Copyright (c) 2000, 2003 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials 
 * are made available under the terms of the Common Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/cpl-v10.html
 * 
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.ant.internal.ui.console;


import org.eclipse.core.resources.IFile;
import org.eclipse.core.resources.ResourcesPlugin;
import org.eclipse.core.runtime.IPath;
import org.eclipse.core.runtime.Path;
import org.eclipse.debug.ui.console.FileLink;
import org.eclipse.debug.ui.console.IConsole;
import org.eclipse.debug.ui.console.IConsoleLineTracker;
import org.eclipse.jface.text.BadLocationException;
import org.eclipse.jface.text.IRegion;
import org.eclipse.ui.externaltools.internal.model.StringMatcher;

/**
 * Generates hyperlinks for javac output
 */
public class JavacLineTracker implements IConsoleLineTracker {
	
	private IConsole fConsole;
	private IFile fLastFile;
	private StringMatcher fEclipseCompilerMatcher;
	private StringMatcher fJavacMatcher;
	private StringMatcher fJikesMatcher;
	
	// trolling for errors after a Jikes error header was found
	private boolean fTrolling = false;

	/**
	 * Constructor for JavacLineTracker.
	 */
	public JavacLineTracker() {
		super();
	}

	/**
	 * @see org.eclipse.debug.ui.console.IConsoleLineTracker#init(org.eclipse.debug.ui.console.IConsole)
	 */
	public void init(IConsole console) {
		fConsole = console;
		fEclipseCompilerMatcher = new StringMatcher("*[javac]*ERROR in*.java*(at line*)*",false, false); //$NON-NLS-1$
		fJavacMatcher = new StringMatcher("*[javac] *.java:*:*",false, false); //$NON-NLS-1$
		fJikesMatcher = new StringMatcher("*[javac] *\"*.java\":", false, false); //$NON-NLS-1$
	}

	/**
	 * @see org.eclipse.debug.ui.console.IConsoleLineTracker#lineAppended(org.eclipse.jface.text.IRegion)
	 */
	public void lineAppended(IRegion line) {
		try {
			int lineOffset = line.getOffset();
			int lineLength = line.getLength();
			String text = fConsole.getDocument().get(lineOffset, lineLength);
			String fileName = null;
			String lineNumber = ""; //$NON-NLS-1$
			int fileStart = -1;
			if (fEclipseCompilerMatcher.match(text)) {
				fTrolling = false;
				int index = text.indexOf("ERROR in"); //$NON-NLS-1$
				if (index > 0) {
					fileStart = index + 9;
					index = text.lastIndexOf("(at line "); //$NON-NLS-1$
					if (index > 0) {
						int fileEnd = index - 1;
						int numberStart = index + 9;
						index = text.lastIndexOf(')');
						if (index > 0) {
							int numberEnd = index;
							fileName = text.substring(fileStart, fileEnd).trim();
							lineNumber = text.substring(numberStart, numberEnd).trim();
						}
					}
				}
			} else if (fJavacMatcher.match(text)) {
				fTrolling = false;
				fileStart = text.indexOf("[javac] "); //$NON-NLS-1$
				fileStart += 8;
				int index = text.indexOf(".java:", fileStart); //$NON-NLS-1$
				if (index > 0) {
					int numberStart = index + 6;
					fileName = text.substring(fileStart, numberStart - 1).trim();
					index = text.indexOf(":", numberStart); //$NON-NLS-1$
					if (index > numberStart) {
						lineNumber = text.substring(numberStart, index);
					}
				}
			} else if (fJikesMatcher.match(text)) {
				fileStart = text.indexOf('"');
				fileStart++;
				int index = text.indexOf(".java\"", fileStart); //$NON-NLS-1$
				if (index > 0) {
					index += 5;
					fileName = text.substring(fileStart, index).trim();
					fTrolling = true;
				}
			} else if (fTrolling) {
				int index = text.indexOf("[javac]"); //$NON-NLS-1$
				if (index > 0) {
					// look for a line number
					index+=7; 
					int numEnd = text.indexOf(".", index); //$NON-NLS-1$
					if (numEnd > 0) {
						String number = text.substring(index, numEnd).trim();
						try {
							int num = Integer.parseInt(number);
							int numStart = text.indexOf(number, index);
							if (fLastFile != null && fLastFile.exists()) {
								FileLink link = new FileLink(fLastFile, null, -1, -1, num);
								fConsole.addLink(link, lineOffset + numStart, lineLength - numStart);
							}
						} catch (NumberFormatException e) {
							// not a line number
						}
					}
				} else {
					fTrolling = false;
				}
			}
			if (fileName != null) {
				int num = -1;
				try {
					num = Integer.parseInt(lineNumber);
				} catch (NumberFormatException e) {
				}
				IFile file= null;
				IPath filePath= new Path(fileName);
				//first check if in the same file...faster
				if (fLastFile != null && fLastFile.getLocation().equals(filePath)) {
					file= fLastFile;
				} else {
					IFile[] files = ResourcesPlugin.getWorkspace().getRoot().findFilesForLocation(filePath);
					if (files.length != 0) {
						file= files[0];
					}
				}
				fLastFile = file;
				if (file != null && file.exists()) {
					FileLink link = new FileLink(file, null, -1, -1, num);
					fConsole.addLink(link, lineOffset + fileStart, lineLength - fileStart);
				}
			}
		} catch (BadLocationException e) {
		}
	}

	/**
	 * @see org.eclipse.debug.ui.console.IConsoleLineTracker#dispose()
	 */
	public void dispose() {
		fConsole = null;
	}

}