Hello,
The following code yields an "end of file" error:
import net.percederberg.grammatica.parser.Parser;
import java.io.FileReader;
public class ProductionGrammar {
public static void main(String[] args) {
// Check for command line errors
if (args.length != 1)
{
System.out.println("Usage: ProductionGrammar <input filename>");
System.exit(1);
}
try
{
Parser parser = new GrammarParser(new FileReader(args[0]));
parser.parse();
}
catch (Exception ex)
{
System.out.println(ex);
}
}
}
Here is my grammar file:
%header%
GRAMMARTYPE = "LL"
DESCRIPTION = "A grammar for the grammar file format. The grammar is LL(1),
meaning that it is best read with a recursive descent parser.
The grammar file format is used for describing grammars."
AUTHOR = "Per Cederberg, <per at percederberg dot net>"
VERSION = "1.2"
DATE = "10 June 2003"
LICENSE = "This work 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 (at your option) any later version.
This work 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
As a special exception, the copyright holders of this library give
you permission to link this library with independent modules to
produce an executable, regardless of the license terms of these
independent modules, and to copy and distribute the resulting
executable under terms of your choice, provided that you also meet,
for each linked independent module, the terms and conditions of the
license of that module. An independent module is a module which is
not derived from or based on this library. If you modify this
library, you may extend this exception to your version of the
library, but you are not obligated to do so. If you do not wish to
do so, delete this exception statement from your version."
COPYRIGHT = "Copyright (c) 2003 Per Cederberg. All rights reserved."
%tokens%
IDENTIFIER = <<[A-Za-z][A-Za-z0-9_]*>>
QUOTED_STRING = <<("[^"]*")|('[^']*')>>
WHITESPACE = <<[ \t\n\r]+>> %ignore%
EQUALS = "="
OR = "|"
PRODUCTION_EQUALS = ":="
SEMICOLON = ";"
QUESTION = "?"
ASTERISK = "*"
PLUS = "+"
LEFT_PAREN = "("
RIGHT_PAREN = ")"
PERCENT = "%"
%productions%
// Start production
Grammar = (TokenDeclaration | ProductionDeclaration)+ ;
TokenDeclaration = IDENTIFIER EQUALS OR LEFT_PAREN PERCENT LEFT_PAREN
QUOTED_STRING RIGHT_PAREN
(PERCENT LEFT_PAREN QUOTED_STRING RIGHT_PAREN)* RIGHT_PAREN SEMICOLON ;
ProductionDeclaration = IDENTIFIER PRODUCTION_EQUALS PERCENT LEFT_PAREN
Production+ RIGHT_PAREN SEMICOLON ;
Production = (QUESTION|ASTERISK|PLUS|PERCENT) LEFT_PAREN IDENTIFIER
RIGHT_PAREN
| (QUESTION|ASTERISK|PLUS|PERCENT) LEFT_PAREN Production RIGHT_PAREN
| OR LEFT_PAREN Production+ RIGHT_PAREN
;
Finally, here is my test data:
DIGITS = |(%("1") %("2") %("3"));
NZDIGITS = |(%("1") %("2"));
NUMBER := %(%(NZDIGITS) *(|(+(NZDIGITS) %(DIGITS))));
Any ideas?
Thanks,
Craig
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