/*
* gnu/regexp/RETokenStart.java
* Copyright (C) 1998 Wes Biggs
*
* This library is free software; you can redistribute it and/or modify
* it under the terms of the GNU Library 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 Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
package gnu.regexp;
class RETokenStart extends REToken {
private boolean newline; // matches after a newline
RETokenStart(int f_subIndex, boolean f_newline) {
super(f_subIndex);
newline = f_newline;
}
int[] match(CharIndexed input, int index, int eflags, REMatch mymatch) {
// charAt(index-1) may be unknown on an InputStream. FIXME
// Match after a newline if in multiline mode
if (newline && (mymatch.offset > 0) && (input.charAt(index - 1) == '\n'))
return next(input,index,eflags,mymatch);
// Don't match at all if REG_NOTBOL is set.
if ((eflags & RE.REG_NOTBOL) > 0) return null;
if ((eflags & RE.REG_ANCHORINDEX) > 0)
return (mymatch.anchor == mymatch.offset) ?
next(input,index,eflags,mymatch) : null;
else
return ((index == 0) && (mymatch.offset == 0)) ?
next(input,index,eflags,mymatch) : null;
}
void dump(StringBuffer os) {
os.append('^');
}
}