/*
 * HTMLTokenMarker.java - HTML token marker
 * Copyright (C) 1998, 1999 Slava Pestov
 * Portions Copyright (C) 2001 by Romain Guy
 * (this includes attributes colorizing)
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 */
package org.gjt.sp.jedit.syntax;

import javax.swing.text.Segment;

/**
 * HTML token marker.
 *
 * @author Slava Pestov
 * @version $Id: HTMLTokenMarker.java,v 1.3 2001/12/01 18:54:31 gfx Exp $
 */
public class HTMLTokenMarker extends TokenMarker
{
  public static final byte JAVASCRIPT = Token.INTERNAL_FIRST;
  public static final byte HTML_LITERAL_QUOTE = Token.INTERNAL_FIRST + 1;
  public static final byte HTML_LITERAL_NO_QUOTE = Token.INTERNAL_FIRST + 2;
  public static final byte INSIDE_TAG = Token.INTERNAL_FIRST + 3;

  public HTMLTokenMarker()
  {
    this(true);
  }

  public HTMLTokenMarker(boolean js)
  {
    this.js = js;
    keywords = JavaScriptTokenMarker.getKeywords();
  }

  public byte markTokensImpl(byte token, Segment line, int lineIndex)
  {
    char[] array = line.array;
    int offset = line.offset;
    lastOffset = offset;
    lastKeyword = offset;
    int length = line.count + offset;
    boolean backslash = false;
    lastWhitespace = offset - 1;

    loop:
    for (int i = offset; i < length; i++)
    {
      int i1 = (i + 1);

      char c = array[i];
      if (c == '\\')
      {
        backslash = !backslash;
        if (token == JAVASCRIPT)
          continue;
      }

      switch (token)
      {
        case Token.NULL: // HTML text
          backslash = false;
          switch (c)
          {
            case '\\':
              addToken(i - lastOffset, token);
              lastOffset = lastKeyword = i;
              token = Token.OPERATOR;
              break;
            case '<':
              addToken(i - lastOffset, token);
              lastOffset = lastKeyword = i;
              if (SyntaxUtilities.regionMatches(false, line, i1, "!--"))
              {
                i += 3;
                token = Token.COMMENT1;
              } else if (js && SyntaxUtilities.regionMatches(true, line, i1, "script")) {
                addToken(1, Token.KEYWORD1);
                //addToken(6, Token.METHOD);
                //lastOffset = lastKeyword = (i += 7);
                lastOffset = lastKeyword = i1;
                token = Token.METHOD;//JAVASCRIPT;
                javascript = true;
              } else {
                addToken(1, Token.KEYWORD1);
                lastOffset = lastKeyword = i1;
                token = Token.METHOD;
              }
              break;
            case '&':
              addToken(i - lastOffset, token);
              lastOffset = lastKeyword = i;
              token = Token.KEYWORD2;
              break;
          }
          break;
        case Token.OPERATOR:
          backslash = false;
          if (c != '<')
          {
            addToken(i1 - lastOffset, token);
            lastOffset = lastKeyword = i1;
            token = Token.NULL;
          }
          break;
        case Token.METHOD: // Inside a tag
          backslash = false;
          if (c == '>')
          {
            addToken(i - lastOffset, token);
            addToken(1, Token.KEYWORD1);
            lastOffset = lastKeyword = i1;
            if (!javascript)
              token = Token.NULL;
            else
            {
              javascript = false;
              lastWhitespace = i;
              token = JAVASCRIPT;
            }
          } else if (c == ':') {
            addToken(i1 - lastOffset, Token.LITERAL2);
            lastOffset = lastKeyword = i1;
          } else if (c == ' ' || c == '\t') {
            addToken(i1 - lastOffset, token);
            lastOffset = lastKeyword = i1;
            token = INSIDE_TAG;
          }
          break;
        case INSIDE_TAG:
          if (c == '>')
          {
            addToken(i - lastOffset, Token.METHOD);
            addToken(1, Token.KEYWORD1);
            lastOffset = lastKeyword = i1;
            if (!javascript)
              token = Token.NULL;
            else
            {
              javascript = false;
              token = JAVASCRIPT;
            }
          } else if (c == '/' || c == '?') {
            addToken(1, Token.METHOD);
            lastOffset = lastKeyword = i1;
            token = Token.METHOD;
          } else {//if (c != ' ' && c != '\t') {
            addToken(i - lastOffset, Token.NULL);
            lastOffset = lastKeyword = i;
            token = Token.KEYWORD3;
          }
          break;
        case Token.KEYWORD2: // Inside an entity
          backslash = false;
          if (c == ';')
          {
            addToken(i1 - lastOffset, token);
            lastOffset = lastKeyword = i1;
            token = Token.NULL;
          }
          break;
        case Token.KEYWORD3: // Inside an attribute
          if (c == '/' || c == '?')
          {
            addToken(i - lastOffset, token);
            addToken(1, Token.METHOD);
            lastOffset = lastKeyword = i1;
            //token = INSIDE_TAG;
          } else if (c == '=') {
            addToken(i - lastOffset, token);
            addToken(1, Token.LABEL);
            lastOffset = lastKeyword = i1;
            if (i1 < array.length && array[i1] == '"')
            {
              token = HTML_LITERAL_QUOTE;
              i++;
            } else {
              token = HTML_LITERAL_NO_QUOTE;
            }
          } else if (c == '>') {
            addToken(i - lastOffset, token);
            addToken(1, Token.KEYWORD1);
            lastOffset = lastKeyword = i1;
            token = Token.NULL;
          } else if (c == ' ' || c == '\t') {
            addToken(i1 - lastOffset, token);
            lastOffset = lastKeyword = i1;
            token = INSIDE_TAG;
          }
          break;
        case HTML_LITERAL_QUOTE:
          if (c == '"')
          {
            addToken(i1 - lastOffset, Token.LITERAL1);
            lastOffset = lastKeyword = i1;
            token = INSIDE_TAG;
          }
          break;
        case HTML_LITERAL_NO_QUOTE:
          if (c == ' ' || c == '\t')
          {
            addToken(i1 - lastOffset, Token.LITERAL1);
            lastOffset = lastKeyword = i1;
            token = INSIDE_TAG;
          } else if (c == '>') {
            addToken(i - lastOffset, Token.LITERAL1);
            addToken(1, Token.KEYWORD1);
            lastOffset = lastKeyword = i1;
            token = Token.NULL;
          }
          break;
        case Token.COMMENT1: // Inside a comment
          backslash = false;
          if (SyntaxUtilities.regionMatches(false, line, i, "-->"))
          {
            addToken((i + 3) - lastOffset, token);
            lastOffset = lastKeyword = i + 3;
            token = Token.NULL;
          }
          break;
        case JAVASCRIPT: // Inside a JavaScript
          switch (c)
          {
            case '<':
              backslash = false;
              doKeyword(line, i, c);
              if (SyntaxUtilities.regionMatches(true, line, i1, "/script>"))
              {
                addToken(i - lastOffset, Token.NULL);
                addToken(1, Token.KEYWORD1);
                addToken(7, Token.METHOD);
                addToken(1, Token.KEYWORD1);
                lastOffset = lastKeyword = (i += 9);
                token = Token.NULL;
              }
              break;
            case '(':
              if (backslash)
              {
                doKeyword(line, i, c);
                backslash = false;
              } else {
                if (doKeyword(line, i, c))
                  break;
                addToken(lastWhitespace - lastOffset + 1, Token.NULL);
                addToken(i - lastWhitespace - 1, Token.METHOD);
                addToken(1, Token.NULL);
                token = JAVASCRIPT;
                lastOffset = lastKeyword = i1;
                lastWhitespace = i;
              }
              break;
            case '"':
              if (backslash)
                backslash = false;
              else
              {
                doKeyword(line, i, c);
                addToken(i - lastOffset, Token.NULL);
                lastOffset = lastKeyword = i;
                token = Token.LITERAL1;
              }
              break;
            case '\'':
              if (backslash)
                backslash = false;
              else
              {
                doKeyword(line, i, c);
                addToken(i - lastOffset, Token.NULL);
                lastOffset = lastKeyword = i;
                token = Token.LITERAL2;
              }
              break;
            case '/':
              backslash = false;
              doKeyword(line, i, c);
              if (length - i > 1)
              {
                addToken(i - lastOffset, Token.NULL);
                lastOffset = lastKeyword = i;
                if (array[i1] == '/')
                {
                  addToken(length - i, Token.COMMENT2);
                  lastOffset = lastKeyword = length;
                  break loop;
                } else if (array[i1] == '*') {
                  token = Token.COMMENT2;
                }
              }
              break;
            default:
              backslash = false;
              if (!Character.isLetterOrDigit(c) && c != '_')
                doKeyword(line, i, c);
              if (CTokenMarker.METHOD_DELIMITERS.indexOf(c) != -1)
              {
                lastWhitespace = i;
              }
              break;
          }
          break;
        case Token.LITERAL1: // JavaScript "..."
          if (backslash)
            backslash = false;
          else if (c == '"')
          {
            addToken(i1 - lastOffset, Token.LITERAL1);
            lastOffset = lastKeyword = i1;
            token = JAVASCRIPT;
          }
          break;
        case Token.LITERAL2: // JavaScript '...'
          if (backslash)
            backslash = false;
          else if (c == '\'')
          {
            addToken(i1 - lastOffset, Token.LITERAL1);
            lastOffset = lastKeyword = i1;
            token = JAVASCRIPT;
          }
          break;
        case Token.COMMENT2: // Inside a JavaScript comment
          backslash = false;
          if (c == '*' && length - i > 1 && array[i1] == '/')
          {
            addToken((i += 2) - lastOffset, Token.COMMENT1);
            lastOffset = lastKeyword = i;
            token = JAVASCRIPT;
          }
          break;
        default:
          throw new InternalError("Invalid state: " + token);
      }
    }

    switch (token)
    {
      case Token.LITERAL1:
      case Token.LITERAL2:
        addToken(length - lastOffset, Token.INVALID);
        token = JAVASCRIPT;
        break;
      case Token.KEYWORD2:
        addToken(length - lastOffset, Token.INVALID);
        token = Token.NULL;
        break;
      case JAVASCRIPT:
        doKeyword(line, length, '\0');
        addToken(length - lastOffset, Token.NULL);
        break;
      case Token.COMMENT2:
        addToken(length - lastOffset, Token.COMMENT1);
        break;
      case INSIDE_TAG:
        break;
      case HTML_LITERAL_QUOTE: case HTML_LITERAL_NO_QUOTE:
        addToken(length - lastOffset, Token.LITERAL1);
        break;
      default:
        addToken(length - lastOffset, token);
        break;
    }

    return token;
  }

  // private members
  private KeywordMap keywords;
  private boolean js;
  private boolean javascript;
  private int lastOffset;
  private int lastKeyword;
  private int lastWhitespace;

  private boolean doKeyword(Segment line, int i, char c)
  {
    int i1 = i + 1;

    int len = i - lastKeyword;
    byte id = keywords.lookup(line, lastKeyword, len);
    if (id != Token.NULL)
    {
      if (lastKeyword != lastOffset)
        addToken(lastKeyword - lastOffset, Token.NULL);
      addToken(len, id);
      lastKeyword = i1;
      lastOffset = i;
      lastWhitespace = i;
      return true;
    }
    lastKeyword = i1;
    return false;
  }
}