[antlr-interest] Is c# antlr slow

[altongoerby]

I ahve the following .g files. It all compiles well.
If i try to parse a short line like in the following c# main it 
takes more than 1 second to execute parser.expression(); which of 
course is inacceptable. I am not sure what antlr is doing so long???

class Test 
{
	public static void Main(string[] args) 
	{
	
		SimpleLexer lexer = new SimpleLexer(new StringReader
("trans1.Position [1 11   0   ](.hy \"hallo\" 12 [[1 2 3] [2 4 8 7] 
[3 0 1] [  4  9  876 12   ]   ]) "));
		SimpleParser parser = new SimpleParser(lexer);
		

		// Parse the input expression
		KernelServer ks = new KernelServer();
		Console.WriteLine(ks.TimeServer.Time);
		parser.expression();
		Console.WriteLine(ks.TimeServer.Time);
		CommonAST t = (CommonAST)parser.getAST();
			
		// Print the resulting tree out in LISP notation
		Console.Out.WriteLine(t.ToStringTree());
	}
}

Btw i use the following geramme:

options {
	language = "CSharp";
}


class SimpleParser extends Parser;
options {
	buildAST = true;	// uses CommonAST by default
	k=1;
}

expression	: 	assignment | command 			
						
		;
assignment	: 	VAR ASSIGN! (command | VAR | literal) 	
		;
command		: 	commandname (parameter)*  		
						
		;
commandname	: 	IDENT (DOT! IDENT)? | DOT! IDENT	
		;
parameter	: 	LPAREN! command RPAREN! | VAR | literal 
						
		;
literal		: 	affine | STRING | FLOAT			
						
		;
affine		: 	LBRACK! (matrix | vector)  RBRACK!
		;
matrix 		: 	LBRACK! vector RBRACK! LBRACK! vector 
RBRACK! LBRACK! vector RBRACK! (LBRACK! vector RBRACK!)?
		;
vector          :       FLOAT FLOAT FLOAT (FLOAT)?
		;
		
		

class SimpleLexer extends Lexer;
options {
	k=1;
}


WS		:	(' '|'\t'|'\r'|'\n')
			{ _ttype = Token.SKIP; }
		;

LPAREN		:	'('
		;

RPAREN		:	')'
		;
LBRACK		:	'['
		;

RBRACK		:	']'
		;
ASSIGN		:	'='
		;

DOT		:	'.'
		;
	
STRING		:	'"' (~('"'|'\\'))* '"'
		;

IDENT       	:	('a'..'z'|'A'..'Z'|'_') 
('a'..'z'|'A'..'Z'|'_'|'0'..'9')*
		;

VAR		:	'$' IDENT
		;
		
FLOAT		:	('0'..'9')+
		;

I hope someone can help me with that?

Also why does antlr generate such ugly code, at least in c# 
(horrible)?

Bye,

Alton



 

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