/*
* TeXTokenMarker.java - TeX/LaTeX/AMS-TeX token marker
* Copyright (C) 1998 Slava Pestov
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*/
package textarea.syntax;
import javax.swing.text.Segment;
/**
* TeX token marker.
*
* @author Slava Pestov
* @version $Id$
*/
public class TeXTokenMarker extends TokenMarker
{
// public members
public static final byte BDFORMULA = Token.INTERNAL_FIRST;
public static final byte EDFORMULA = (byte)(Token.INTERNAL_FIRST + 1);
public byte markTokensImpl(byte token, Segment line, int lineIndex)
{
char[] array = line.array;
int offset = line.offset;
int lastOffset = offset;
int length = line.count + offset;
boolean backslash = false;
loop: for(int i = offset; i < length; i++)
{
int i1 = (i+1);
char c = array[i];
// if a backslash is followed immediately
// by a non-alpha character, the command at
// the non-alpha char. If we have a backslash,
// some text, and then a non-alpha char,
// the command ends before the non-alpha char.
if(Character.isLetter(c))
{
backslash = false;
}
else
{
if(backslash)
{
// \<non alpha>
// we skip over this character,
// hence the `continue'
backslash = false;
if(token == Token.KEYWORD2 || token == EDFORMULA)
token = Token.KEYWORD2;
addToken(i1 - lastOffset,token);
lastOffset = i1;
if(token == Token.KEYWORD1)
token = Token.NULL;
continue;
}
else
{
//\blah<non alpha>
// we leave the character in
// the stream, and it's not
// part of the command token
if(token == BDFORMULA || token == EDFORMULA)
token = Token.KEYWORD2;
addToken(i - lastOffset,token);
if(token == Token.KEYWORD1)
token = Token.NULL;
lastOffset = i;
}
}
switch(c)
{
case '%':
if(backslash)
{
backslash = false;
break;
}
addToken(i - lastOffset,token);
addToken(length - i,Token.COMMENT1);
lastOffset = length;
break loop;
case '\\':
backslash = true;
if(token == Token.NULL)
{
token = Token.KEYWORD1;
addToken(i - lastOffset,Token.NULL);
lastOffset = i;
}
break;
case '$':
backslash = false;
if(token == Token.NULL) // singe $
{
token = Token.KEYWORD2;
addToken(i - lastOffset,Token.NULL);
lastOffset = i;
}
else if(token == Token.KEYWORD1) // \...$
{
token = Token.KEYWORD2;
addToken(i - lastOffset,Token.KEYWORD1);
lastOffset = i;
}
else if(token == Token.KEYWORD2) // $$aaa
{
if(i - lastOffset == 1 && array[i-1] == '$')
{
token = BDFORMULA;
break;
}
token = Token.NULL;
addToken(i1 - lastOffset,Token.KEYWORD2);
lastOffset = i1;
}
else if(token == BDFORMULA) // $$aaa$
{
token = EDFORMULA;
}
else if(token == EDFORMULA) // $$aaa$$
{
token = Token.NULL;
addToken(i1 - lastOffset,Token.KEYWORD2);
lastOffset = i1;
}
break;
}
}
if(lastOffset != length)
addToken(length - lastOffset,token == BDFORMULA
|| token == EDFORMULA ? Token.KEYWORD2 :
token);
return (token != Token.KEYWORD1 ? token : Token.NULL);
}
}
/*
* ChangeLog:
* $Log$
* Revision 1.1 2001/09/07 02:47:52 davidmartinez
* Initial revision
*
* Revision 1.1.1.1 1999/10/20 00:09:24 david
* Initial Import
*
* Revision 1.2 1999/10/20 00:09:24 david
* Ran Dos2Unix on all the .java files within the textarea package.
*
* Revision 1.1.1.1 1999/10/18 15:00:24 david
* Initial Check-in
*
* Revision 1.15 1999/06/05 00:22:58 sp
* LGPL'd syntax package
*
* Revision 1.14 1999/06/03 08:24:14 sp
* Fixing broken CVS
*
* Revision 1.15 1999/05/31 08:11:10 sp
* Syntax coloring updates, expand abbrev bug fix
*
* Revision 1.14 1999/05/31 04:38:51 sp
* Syntax optimizations, HyperSearch for Selection added (Mike Dillon)
*
* Revision 1.13 1999/04/19 05:38:20 sp
* Syntax API changes
*
* Revision 1.12 1999/04/01 04:13:00 sp
* Bug fixing for 1.5final
*
* Revision 1.11 1999/03/27 00:44:15 sp
* Documentation updates, various bug fixes
*
* Revision 1.10 1999/03/13 00:09:07 sp
* Console updates, uncomment removed cos it's too buggy, cvs log tags added
*
* Revision 1.9 1999/03/12 23:51:00 sp
* Console updates, uncomment removed cos it's too buggy, cvs log tags added
*
*/