114 lines
3.6 KiB
C++
114 lines
3.6 KiB
C++
/*
|
|
* (C) Copyright The MITRE Corporation 1999 All rights reserved.
|
|
*
|
|
* The contents of this file are subject to the Mozilla Public License
|
|
* Version 1.0 (the "License"); you may not use this file except in
|
|
* compliance with the License. You may obtain a copy of the License at
|
|
* http://www.mozilla.org/MPL/
|
|
*
|
|
* The program provided "as is" without any warranty express or
|
|
* implied, including the warranty of non-infringement and the implied
|
|
* warranties of merchantibility and fitness for a particular purpose.
|
|
* The Copyright owner will not be liable for any damages suffered by
|
|
* you as a result of using the Program. In no event will the Copyright
|
|
* owner be liable for any special, indirect or consequential damages or
|
|
* lost profits even if the Copyright owner has been advised of the
|
|
* possibility of their occurrence.
|
|
*
|
|
* Please see release.txt distributed with this file for more information.
|
|
*
|
|
*/
|
|
|
|
#include "Expr.h"
|
|
|
|
//-------------------/
|
|
//- VariableRefExpr -/
|
|
//-------------------/
|
|
|
|
/**
|
|
* Default constructor
|
|
**/
|
|
VariableRefExpr::VariableRefExpr() {
|
|
} //-- VariableRefExpr
|
|
|
|
/**
|
|
* Creates a VariableRefExpr with the given variable name
|
|
**/
|
|
VariableRefExpr::VariableRefExpr(const String& name) {
|
|
this->name = name;
|
|
} //-- VariableRefExpr
|
|
|
|
/**
|
|
* Creates a VariableRefExpr with the given variable name
|
|
**/
|
|
VariableRefExpr::VariableRefExpr(String& name) {
|
|
this->name = name;
|
|
} //-- VariableRefExpr
|
|
|
|
/**
|
|
* Default destructor
|
|
**/
|
|
VariableRefExpr::~VariableRefExpr() {
|
|
} //-- ~VariableRefExpr
|
|
|
|
/**
|
|
* Evaluates this Expr based on the given context node and processor state
|
|
* @param context the context node for evaluation of this Expr
|
|
* @param ps the ContextState containing the stack information needed
|
|
* for evaluation
|
|
* @return the result of the evaluation
|
|
**/
|
|
ExprResult* VariableRefExpr::evaluate(Node* context, ContextState* cs) {
|
|
|
|
ExprResult* exprResult = cs->getVariable(name);
|
|
//-- make copy to prevent deletetion
|
|
//-- I know, I should add a #copy method to ExprResult, I will
|
|
ExprResult* copyOfResult = 0;
|
|
|
|
if ( exprResult ) {
|
|
switch ( exprResult->getResultType() ) {
|
|
//-- BooleanResult
|
|
case ExprResult::BOOLEAN :
|
|
copyOfResult = new BooleanResult(exprResult->booleanValue());
|
|
break;
|
|
//-- NodeSet
|
|
case ExprResult::NODESET :
|
|
{
|
|
NodeSet* src = (NodeSet*)exprResult;
|
|
NodeSet* dest = new NodeSet(src->size());
|
|
for ( int i = 0; i < src->size(); i++)
|
|
dest->add(src->get(i));
|
|
copyOfResult = dest;
|
|
break;
|
|
}
|
|
//-- NumberResult
|
|
case ExprResult::NUMBER :
|
|
copyOfResult = new NumberResult(exprResult->numberValue());
|
|
break;
|
|
//-- StringResult
|
|
default:
|
|
StringResult* strResult = new StringResult();
|
|
exprResult->stringValue(strResult->getValue());
|
|
copyOfResult = strResult;
|
|
break;
|
|
}
|
|
}
|
|
else copyOfResult = new StringResult();
|
|
|
|
return copyOfResult;
|
|
} //-- evaluate
|
|
|
|
/**
|
|
* Returns the String representation of this Expr.
|
|
* @param dest the String to use when creating the String
|
|
* representation. The String representation will be appended to
|
|
* any data in the destination String, to allow cascading calls to
|
|
* other #toString() methods for Expressions.
|
|
* @return the String representation of this Expr.
|
|
**/
|
|
void VariableRefExpr::toString(String& str) {
|
|
str.append('$');
|
|
str.append(name);
|
|
} //-- toString
|
|
|