100 lines
2.9 KiB
C++
100 lines
2.9 KiB
C++
/*
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* The contents of this file are subject to the Mozilla Public
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* License Version 1.1 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS
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* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
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* implied. See the License for the specific language governing
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* rights and limitations under the License.
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*
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* The Original Code is TransforMiiX XSLT processor.
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*
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* The Initial Developer of the Original Code is The MITRE Corporation.
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* Portions created by MITRE are Copyright (C) 1999 The MITRE Corporation.
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*
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* Portions created by Keith Visco as a Non MITRE employee,
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* (C) 1999 Keith Visco. All Rights Reserved.
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*
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* Contributor(s):
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* Keith Visco, kvisco@ziplink.net
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* -- original author.
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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:
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* + : addition
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* - : subtraction
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**/
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#include "Expr.h"
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#include "ExprResult.h"
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#include "primitives.h"
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#include "txIXPathContext.h"
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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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nsresult
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AdditiveExpr::evaluate(txIEvalContext* aContext, txAExprResult** aResult)
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{
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*aResult = nsnull;
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nsRefPtr<txAExprResult> exprRes;
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nsresult rv = rightExpr->evaluate(aContext, getter_AddRefs(exprRes));
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NS_ENSURE_SUCCESS(rv, rv);
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double rightDbl = exprRes->numberValue();
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rv = leftExpr->evaluate(aContext, getter_AddRefs(exprRes));
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NS_ENSURE_SUCCESS(rv, rv);
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double leftDbl = exprRes->numberValue();
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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 aContext->recycler()->getNumberResult(result, aResult);
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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(nsAString& str) {
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if ( leftExpr ) leftExpr->toString(str);
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else str.Append(NS_LITERAL_STRING("null"));
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switch ( op ) {
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case SUBTRACTION:
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str.Append(NS_LITERAL_STRING(" - "));
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break;
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default:
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str.Append(NS_LITERAL_STRING(" + "));
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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(NS_LITERAL_STRING("null"));
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} //-- toString
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