pjs/extensions/transformiix/source/xpath/AdditiveExpr.cpp

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/*
* The contents of this file are subject to the Mozilla Public
* License Version 1.1 (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/
*
* Software distributed under the License is distributed on an "AS
* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
* implied. See the License for the specific language governing
* rights and limitations under the License.
*
* The Original Code is TransforMiiX XSLT processor.
*
* The Initial Developer of the Original Code is The MITRE Corporation.
* Portions created by MITRE are Copyright (C) 1999 The MITRE Corporation.
*
* Portions created by Keith Visco as a Non MITRE employee,
* (C) 1999 Keith Visco. All Rights Reserved.
*
* Contributor(s):
* Keith Visco, kvisco@ziplink.net
* -- original author.
*
* $Id: AdditiveExpr.cpp,v 1.1 2000-04-06 07:44:37 kvisco%ziplink.net Exp $
*/
/**
* Represents a AdditiveExpr, an binary expression that
* performs an additive operation between it's lvalue and rvalue:<BR/>
* + : addition
* - : subtraction
* @author <A HREF="mailto:kvisco@ziplink.net">Keith Visco</A>
* @version $Revision: 1.1 $ $Date: 2000-04-06 07:44:37 $
**/
#include "Expr.h"
/**
* Creates a new AdditiveExpr using the default operator (ADDITION)
**/
AdditiveExpr::AdditiveExpr() {
this->op = ADDITION;
this->leftExpr = 0;
this->rightExpr = 0;
} //-- AdditiveExpr
/**
* Creates a new AdditiveExpr using the given operator
**/
AdditiveExpr::AdditiveExpr(Expr* leftExpr, Expr* rightExpr, short op) {
this->op = op;
this->leftExpr = leftExpr;
this->rightExpr = rightExpr;
} //-- AdditiveExpr
AdditiveExpr::~AdditiveExpr() {
delete leftExpr;
delete rightExpr;
} //-- ~AdditiveExpr
/**
* Sets the left side of this AdditiveExpr
**/
void AdditiveExpr::setLeftExpr(Expr* leftExpr) {
this->leftExpr = leftExpr;
} //-- setLeftExpr
/**
* Sets the right side of this AdditiveExpr
**/
void AdditiveExpr::setRightExpr(Expr* rightExpr) {
this->rightExpr = rightExpr;
} //-- setRightExpr
/**
* 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* AdditiveExpr::evaluate(Node* context, ContextState* cs) {
double rightDbl = Double::NaN;
ExprResult* exprRes = 0;
if ( rightExpr ) {
exprRes = rightExpr->evaluate(context, cs);
if ( exprRes ) rightDbl = exprRes->numberValue();
delete exprRes;
}
double leftDbl = Double::NaN;
if ( leftExpr ) {
exprRes = leftExpr->evaluate(context, cs);
if ( exprRes ) leftDbl = exprRes->numberValue();
delete exprRes;
}
double result = 0;
switch ( op ) {
case SUBTRACTION:
result = leftDbl - rightDbl;
break;
default:
result = leftDbl + rightDbl;
break;
}
return new NumberResult(result);
} //-- 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 AdditiveExpr::toString(String& str) {
if ( leftExpr ) leftExpr->toString(str);
else str.append("null");
switch ( op ) {
case SUBTRACTION:
str.append(" - ");
break;
default:
str.append(" + ");
break;
}
if ( rightExpr ) rightExpr->toString(str);
else str.append("null");
} //-- toString