91 lines
3.9 KiB
Plaintext
91 lines
3.9 KiB
Plaintext
/*
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* [The "BSD license"]
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* Copyright (c) 2011 Terence Parr
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* All rights reserved.
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*
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* Conversion to C#:
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* Copyright (c) 2011 Sam Harwell, Pixel Mine, Inc.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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tree grammar DebugTreeGrammar;
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options
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{
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language=CSharp3;
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tokenVocab=DebugGrammar;
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ASTLabelType=CommonTree;
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}
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// START:members
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@header
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{
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//import java.util.Map;
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//import java.util.HashMap;
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using BigInteger = System.Numerics.BigInteger;
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using Console = System.Console;
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}
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// END:members
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@namespace{Antlr3.Runtime.Test.BuildOptions}
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// START:rules
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prog: stat*
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;
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stat: expr { string result = $expr.value.ToString();
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Console.Out.WriteLine($expr.value + " (about " + result[0] + "*10^" + (result.Length-1) + ")");
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}
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| ^('=' ID expr) { globalMemory[$ID.text] = $expr.value; }
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| ^(FUNC .+) // ignore FUNCs - we added them to functionDefinitions already in parser.
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;
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expr returns [BigInteger value]
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: ^('+' a=expr b=expr) { $value = $a.value + $b.value; }
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| ^('-' a=expr b=expr) { $value = $a.value - $b.value; }
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| ^('*' a=expr b=expr) { $value = $a.value * $b.value; }
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| ^('/' a=expr b=expr) { $value = $a.value / $b.value; }
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| ^('%' a=expr b=expr) { $value = $a.value \% $b.value; }
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| ID { $value = getValue($ID.text); }
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| INT { $value = BigInteger.Parse($INT.text); }
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| call { $value = $call.value; }
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;
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call returns [BigInteger value]
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: ^(CALL ID expr) { BigInteger p = $expr.value;
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CommonTree funcRoot = findFunction($ID.text, p);
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if (funcRoot == null) {
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Console.Error.WriteLine("No match found for " + $ID.text + "(" + p + ")");
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} else {
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// Here we set up the local evaluator to run over the
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// function definition with the parameter value.
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// This re-reads a sub-AST of our input AST!
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DebugTreeGrammar e = new DebugTreeGrammar(funcRoot, functionDefinitions, globalMemory, p);
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$value = e.expr();
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}
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}
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;
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// END:rules
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