/*
 * [The "BSD licence"]
 * Copyright (c) 2005-2008 Terence Parr
 * All rights reserved.
 *
 * Conversion to C#:
 * Copyright (c) 2008-2009 Sam Harwell, Pixel Mine, Inc.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

grammar DebugGrammar;

options
{
	language=CSharp3;
	output=AST;
	ASTLabelType=CommonTree;
}

tokens
{
	// define pseudo-operations
	FUNC;
	CALL;
}

// START:stat
prog: ( stat )*
    ;

stat:   expr NEWLINE                    -> expr
    |   ID '=' expr NEWLINE             -> ^('=' ID expr)
    |   func NEWLINE                    -> func
    |   NEWLINE                         -> // ignore
    ;

func:   ID  '(' formalPar ')' '=' expr  -> ^(FUNC ID formalPar expr)
    ;
	finally {
	  functionDefinitions.Add($func.tree);
	}

formalPar
    :   ID
	|   INT
	;

// END:stat

// START:expr
expr:   multExpr (('+'^|'-'^) multExpr)*
    ;

multExpr
    :   atom (('*'|'/'|'%')^ atom)*
    ;

atom:   INT
    |   ID
    |   '(' expr ')'    -> expr
    |   ID '(' expr ')' -> ^(CALL ID expr)
    ;
// END:expr

// START:tokens
ID  :   ('a'..'z'|'A'..'Z')+
	;

INT :   '0'..'9'+
    ;

NEWLINE
    :	'\r'? '\n'
    ;

WS  :   (' '|'\t')+ { Skip(); }
    ;
// END:tokens