| /* |
| * [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 |