/**********************************************************************
Copyright (c) 2000, 2002 IBM Corp. 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 implementation
    Klaus Hartlage - www.eclipseproject.de
**********************************************************************/
package net.sourceforge.phpeclipse.phpeditor.php;

import java.util.ArrayList;
import java.util.List;

import net.sourceforge.phpeclipse.phpeditor.util.HTMLWordDetector;
import net.sourceforge.phpeclipse.phpeditor.util.PHPColorProvider;
import net.sourceforge.phpeclipse.phpeditor.util.PHPWhitespaceDetector;
import org.eclipse.jface.text.BadLocationException;
import org.eclipse.jface.text.TextAttribute;
import org.eclipse.jface.text.rules.ICharacterScanner;
import org.eclipse.jface.text.rules.IRule;
import org.eclipse.jface.text.rules.IToken;
import org.eclipse.jface.text.rules.IWordDetector;
import org.eclipse.jface.text.rules.RuleBasedScanner;
import org.eclipse.jface.text.rules.SingleLineRule;
import org.eclipse.jface.text.rules.Token;
import org.eclipse.jface.text.rules.WhitespaceRule;
import org.eclipse.jface.text.rules.WordRule;

/**
 * A Java code scanner.
 */
public class HTMLCodeScanner extends RuleBasedScanner {

  private static String[] fgKeywords = {
  };

  private static String[] fgTypes = {
  };

  private IToken keyword;

  private class HTMLWordRule extends WordRule {
    private StringBuffer fBuffer = new StringBuffer();

    public HTMLWordRule(IWordDetector detector) {
      super(detector, Token.UNDEFINED);
    }

    public HTMLWordRule(IWordDetector detector, IToken defaultToken) {
      super(detector, defaultToken);
    }

    public IToken evaluate(ICharacterScanner scanner) {
      int c = scanner.read();
      boolean tagBegin = false;
      if (fDetector.isWordStart((char) c)) {
        if (c == '<') {
          tagBegin = true;
        }
        if (fColumn == UNDEFINED || (fColumn == scanner.getColumn() - 1)) {

          fBuffer.setLength(0);
          do {
            fBuffer.append((char) c);
            c = scanner.read();
            if (c == '>') {
              fBuffer.append((char) c);
              c = scanner.read();
              break;
            }
            if (c == '/' && (fBuffer.length() > 2) ) {
              break;
            }
          } while (c != scanner.EOF && fDetector.isWordPart((char) c));
          scanner.unread();

          if (tagBegin) {
            return keyword;
          }
          IToken token = (IToken) fWords.get(fBuffer.toString());
          if (token != null)
            return token;

          if (fDefaultToken.isUndefined())
            unreadBuffer(scanner);

          return fDefaultToken;
        }
      }

      scanner.unread();
      return Token.UNDEFINED;
    }

  }

  //private static String[] fgConstants = { "__LINE__", "__FILE__", "true", "false" };
  private TextAttribute fComment;
  private TextAttribute fKeyword;
  private TextAttribute fType;
  private TextAttribute fString;
  private PHPColorProvider fColorProvider;

  /**
   * Creates a Java code scanner
   */
  public HTMLCodeScanner(PHPColorProvider provider) {

    keyword = new Token(new TextAttribute(provider.getColor(PHPColorProvider.KEYWORD)));
    IToken type = new Token(new TextAttribute(provider.getColor(PHPColorProvider.TYPE)));
    IToken string = new Token(new TextAttribute(provider.getColor(PHPColorProvider.STRING)));
    IToken comment = new Token(new TextAttribute(provider.getColor(PHPColorProvider.SINGLE_LINE_COMMENT)));
    IToken multi_comment = new Token(new TextAttribute(provider.getColor(PHPColorProvider.MULTI_LINE_COMMENT)));
    IToken other = new Token(new TextAttribute(provider.getColor(PHPColorProvider.DEFAULT)));

    //variable = new Token(new TextAttribute(provider.getColor(PHPColorProvider.VARIABLE)));

    List rules = new ArrayList();

    // Add rule for single line comments.
    //rules.add(new EndOfLineRule("//", comment)); //$NON-NLS-1$
    //rules.add(new EndOfLineRule("#", comment));

    // Add rule for strings and character constants.
    rules.add(new SingleLineRule("\"", "\"", string)); //$NON-NLS-2$ //$NON-NLS-1$
    // rules.add(new SingleLineRule("'", "'", string, '\\')); //$NON-NLS-2$ //$NON-NLS-1$

    // rules.add(new SingleLineRule("//", "//", php_comment));
    // rules.add(new MultiLineRule("/*", "*/", multi_comment));

    // Add generic whitespace rule.
    rules.add(new WhitespaceRule(new PHPWhitespaceDetector()));

    // Add word rule for keywords, types, and constants.
    HTMLWordRule wordRule = new HTMLWordRule(new HTMLWordDetector(), other);
    for (int i = 0; i < fgKeywords.length; i++)
      wordRule.addWord(fgKeywords[i], keyword);
    for (int i = 0; i < fgTypes.length; i++)
      wordRule.addWord(fgTypes[i], type);
    //   for (int i = 0; i < fgConstants.length; i++)
    //     wordRule.addWord(fgConstants[i], type);
    rules.add(wordRule);

    IRule[] result = new IRule[rules.size()];
    rules.toArray(result);
    setRules(result);
  }

}