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/*
* [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.
*/
using System.Collections.Generic;
using Antlr.Runtime.Tree;
using BigInteger = java.math.BigInteger;
using Console = System.Console;
partial class DebugTreeGrammar
{
/** Points to functions tracked by tree builder. */
private List<CommonTree> functionDefinitions;
/** Remember local variables. Currently, this is only the function parameter.
*/
private readonly IDictionary<string, BigInteger> localMemory = new Dictionary<string, BigInteger>();
/** Remember global variables set by =. */
private IDictionary<string, BigInteger> globalMemory = new Dictionary<string, BigInteger>();
/** Set up an evaluator with a node stream; and a set of function definition ASTs. */
public DebugTreeGrammar( CommonTreeNodeStream nodes, List<CommonTree> functionDefinitions )
: this( nodes )
{
this.functionDefinitions = functionDefinitions;
}
/** Set up a local evaluator for a nested function call. The evaluator gets the definition
* tree of the function; the set of all defined functions (to find locally called ones); a
* pointer to the global variable memory; and the value of the function parameter to be
* added to the local memory.
*/
private DebugTreeGrammar( CommonTree function,
List<CommonTree> functionDefinitions,
IDictionary<string, BigInteger> globalMemory,
BigInteger paramValue )
// Expected tree for function: ^(FUNC ID ( INT | ID ) expr)
: this( new CommonTreeNodeStream( function.GetChild( 2 ) ), functionDefinitions )
{
this.globalMemory = globalMemory;
localMemory[function.GetChild( 1 ).Text] = paramValue;
}
/** Find matching function definition for a function name and parameter
* value. The first definition is returned where (a) the name matches
* and (b) the formal parameter agrees if it is defined as constant.
*/
private CommonTree findFunction( string name, BigInteger paramValue )
{
foreach ( CommonTree f in functionDefinitions )
{
// Expected tree for f: ^(FUNC ID (ID | INT) expr)
if ( f.GetChild( 0 ).Text.Equals( name ) )
{
// Check whether parameter matches
CommonTree formalPar = (CommonTree)f.GetChild( 1 );
if ( formalPar.Token.Type == INT
&& !new BigInteger( formalPar.Token.Text ).Equals( paramValue ) )
{
// Constant in formalPar list does not match actual value -> no match.
continue;
}
// Parameter (value for INT formal arg) as well as fct name agrees!
return f;
}
}
return null;
}
/** Get value of name up call stack. */
internal BigInteger getValue( string name )
{
BigInteger value;
if ( localMemory.TryGetValue( name, out value ) && value != null )
{
return value;
}
if ( globalMemory.TryGetValue( name, out value ) && value != null )
{
return value;
}
// not found in local memory or global memory
Console.Error.WriteLine( "undefined variable " + name );
return new BigInteger( "0" );
}
}
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