/*******************************************************************************
 * Copyright (c) 2000, 2007 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 
 *******************************************************************************/
package org.eclipse.dltk.debug.ui;

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

import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.Status;
import org.eclipse.jface.text.BadLocationException;
import org.eclipse.jface.text.IDocument;
import org.eclipse.jface.text.IRegion;
import org.eclipse.ui.console.TextConsole;

/**
 * A hyperlink from a stack trace line of the form "(file "*.*")"
 */
public class ScriptDebuggerConsoleToFileHyperlink extends
		ScriptDebugConsoleGenericHyperlink {
	private final Pattern pattern;

	public ScriptDebuggerConsoleToFileHyperlink(TextConsole console,
			Pattern pattern) {
		super(console);
		this.pattern = pattern;
	}

	protected String getFileName(String linkText) throws CoreException {

		Matcher m = pattern.matcher(linkText);
		if (m.find()) {
			String name = m.group(1);
			return name;
		}
		IStatus status = new Status(IStatus.ERROR, DLTKDebugUIPlugin.PLUGIN_ID,
				0, Messages.ScriptDebuggerConsoleToFileHyperlink_error, null);
		throw new CoreException(status);
	}

	protected int getLineNumber(String linkText) throws CoreException {

		Matcher m = pattern.matcher(linkText);
		if (m.find()) {
			String lineText = m.group(2);
			try {
				return Integer.parseInt(lineText);
			} catch (NumberFormatException e) {

			}
		}
		throw new CoreException(Status.CANCEL_STATUS);
	}

	public int computeOffset(int offset, int length, TextConsole console) {
		String linkText = null;

		IDocument document = console.getDocument();
		try {
			int lineNumber = document.getLineOfOffset(offset);
			IRegion lineInformation = document.getLineInformation(lineNumber);
			int lineOffset = lineInformation.getOffset();
			linkText = document.get(lineOffset, lineInformation.getLength());
		} catch (BadLocationException e) {
			return length;
		}
		Matcher m = pattern.matcher(linkText);
		if (m.find()) {
			int len = m.start(1);
			return offset + len;
		}
		return offset;
	}

	public int computeLength(int offset, int length, TextConsole console) {
		String linkText = null;

		IDocument document = console.getDocument();
		try {
			int lineNumber = document.getLineOfOffset(offset);
			IRegion lineInformation = document.getLineInformation(lineNumber);
			int lineOffset = lineInformation.getOffset();
			linkText = document.get(lineOffset, lineInformation.getLength());
		} catch (BadLocationException e) {
			return length;
		}
		Matcher m = pattern.matcher(linkText);
		if (m.find()) {
			int len = m.end(1) - m.start(1);
			return len;
		}
		return length;
	}
}