| /* |
| * [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 FastSimpleExpression; |
| |
| options |
| { |
| language=CSharp3; |
| //slim=true; |
| output=AST; |
| ASTLabelType=CommonTree; |
| } |
| |
| @lexer::superClass{Antlr.Runtime.SlimLexer} |
| |
| public |
| expression |
| : additive_expression |
| EOF |
| ; |
| |
| additive_expression |
| : multiplicative_expression |
| ( ('+'^ | '-'^) |
| multiplicative_expression |
| )* |
| ; |
| |
| multiplicative_expression |
| : atom |
| ( ('*'^ | '/'^ | '%'^) |
| atom |
| )* |
| ; |
| |
| atom |
| : IDENTIFIER |
| | NUMBER |
| ; |
| |
| // |
| // LEXER |
| // |
| |
| IDENTIFIER |
| : ('a'..'z' | 'A'..'Z' | '_') |
| ('a'..'z' | 'A'..'Z' | '_' | '0'..'9')* |
| ; |
| |
| NUMBER |
| : '0'..'9'+ |
| ; |
| |
| WS |
| : (' ' | '\t' | '\n' | '\r' | '\f') |
| {$channel = Hidden;} |
| ; |