1/*
2 * [The "BSD licence"]
3 * Copyright (c) 2005-2008 Terence Parr
4 * All rights reserved.
5 *
6 * Conversion to C#:
7 * Copyright (c) 2008-2009 Sam Harwell, Pixel Mine, Inc.
8 * All rights reserved.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 * 3. The name of the author may not be used to endorse or promote products
19 *    derived from this software without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
22 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
23 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
24 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
26 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
27 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
28 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
29 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
30 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
31 */
32
33grammar SimpleExpression;
34
35options
36{
37	language=CSharp3;
38	output=AST;
39	ASTLabelType=CommonTree;
40}
41
42public
43expression
44	:	additive_expression
45		EOF
46	;
47
48additive_expression
49	:	multiplicative_expression
50		(	('+'^ | '-'^)
51			multiplicative_expression
52		)*
53	;
54
55multiplicative_expression
56	:	atom
57		(	('*'^ | '/'^ | '%'^)
58			atom
59		)*
60	;
61
62atom
63	:	IDENTIFIER
64	|	NUMBER
65	;
66
67//
68// LEXER
69//
70
71IDENTIFIER
72	:	('a'..'z' | 'A'..'Z' | '_')
73		('a'..'z' | 'A'..'Z' | '_' | '0'..'9')*
74	;
75
76NUMBER
77	:	'0'..'9'+
78	;
79
80WS
81	:	(' ' | '\t' | '\n' | '\r' | '\f')
82		{$channel = Hidden;}
83	;
84