134 lines
3.7 KiB
C++
134 lines
3.7 KiB
C++
/*
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* (C) Copyright The MITRE Corporation 1999 All rights reserved.
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*
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* The contents of this file are subject to the Mozilla Public License
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* Version 1.0 (the "License"); you may not use this file except in
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* compliance with the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* The program provided "as is" without any warranty express or
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* implied, including the warranty of non-infringement and the implied
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* warranties of merchantibility and fitness for a particular purpose.
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* The Copyright owner will not be liable for any damages suffered by
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* you as a result of using the Program. In no event will the Copyright
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* owner be liable for any special, indirect or consequential damages or
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* lost profits even if the Copyright owner has been advised of the
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* possibility of their occurrence.
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*
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* Please see release.txt distributed with this file for more information.
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*
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*/
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/**
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* Represents a AdditiveExpr, an binary expression that
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* performs an additive operation between it's lvalue and rvalue:<BR/>
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* + : addition
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* - : substraction
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* @author <a href="mailto:kvisco@mitre.org">Keith Visco</a>
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**/
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#include "Expr.h"
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/**
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* Creates a new AdditiveExpr using the default operator (ADDITION)
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**/
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AdditiveExpr::AdditiveExpr() {
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this->op = ADDITION;
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this->leftExpr = 0;
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this->rightExpr = 0;
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} //-- AdditiveExpr
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/**
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* Creates a new AdditiveExpr using the given operator
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**/
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AdditiveExpr::AdditiveExpr(Expr* leftExpr, Expr* rightExpr, short op) {
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this->op = op;
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this->leftExpr = leftExpr;
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this->rightExpr = rightExpr;
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} //-- AdditiveExpr
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AdditiveExpr::~AdditiveExpr() {
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delete leftExpr;
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delete rightExpr;
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} //-- ~AdditiveExpr
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/**
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* Sets the left side of this AdditiveExpr
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**/
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void AdditiveExpr::setLeftExpr(Expr* leftExpr) {
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this->leftExpr = leftExpr;
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} //-- setLeftExpr
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/**
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* Sets the right side of this AdditiveExpr
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**/
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void AdditiveExpr::setRightExpr(Expr* rightExpr) {
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this->rightExpr = rightExpr;
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} //-- setRightExpr
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/**
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* Evaluates this Expr based on the given context node and processor state
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* @param context the context node for evaluation of this Expr
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* @param ps the ContextState containing the stack information needed
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* for evaluation
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* @return the result of the evaluation
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**/
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ExprResult* AdditiveExpr::evaluate(Node* context, ContextState* cs) {
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double rightDbl = Double::NaN;
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ExprResult* exprRes = 0;
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if ( rightExpr ) {
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exprRes = rightExpr->evaluate(context, cs);
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if ( exprRes ) rightDbl = exprRes->numberValue();
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delete exprRes;
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}
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double leftDbl = Double::NaN;
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if ( leftExpr ) {
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exprRes = leftExpr->evaluate(context, cs);
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if ( exprRes ) leftDbl = exprRes->numberValue();
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delete exprRes;
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}
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double result = 0;
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switch ( op ) {
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case SUBTRACTION:
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result = leftDbl - rightDbl;
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break;
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default:
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result = leftDbl + rightDbl;
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break;
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}
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return new NumberResult(result);
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} //-- evaluate
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/**
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* Returns the String representation of this Expr.
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* @param dest the String to use when creating the String
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* representation. The String representation will be appended to
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* any data in the destination String, to allow cascading calls to
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* other #toString() methods for Expressions.
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* @return the String representation of this Expr.
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**/
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void AdditiveExpr::toString(String& str) {
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if ( leftExpr ) leftExpr->toString(str);
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else str.append("null");
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switch ( op ) {
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case SUBTRACTION:
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str.append(" - ");
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break;
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default:
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str.append(" + ");
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break;
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}
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if ( rightExpr ) rightExpr->toString(str);
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else str.append("null");
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} //-- toString
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