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 33 grammar SimpleExpression; 34 35 options 36 { 37 language=CSharp3; 38 output=AST; 39 ASTLabelType=CommonTree; 40 } 41 42 public 43 expression 44 : additive_expression 45 EOF 46 ; 47 48 additive_expression 49 : multiplicative_expression 50 ( ('+'^ | '-'^) 51 multiplicative_expression 52 )* 53 ; 54 55 multiplicative_expression 56 : atom 57 ( ('*'^ | '/'^ | '%'^) 58 atom 59 )* 60 ; 61 62 atom 63 : IDENTIFIER 64 | NUMBER 65 ; 66 67 // 68 // LEXER 69 // 70 71 IDENTIFIER 72 : ('a'..'z' | 'A'..'Z' | '_') 73 ('a'..'z' | 'A'..'Z' | '_' | '0'..'9')* 74 ; 75 76 NUMBER 77 : '0'..'9'+ 78 ; 79 80 WS 81 : (' ' | '\t' | '\n' | '\r' | '\f') 82 {$channel = Hidden;} 83 ; 84
