зеркало из https://github.com/mozilla/gecko-dev.git
153 строки
4.6 KiB
C++
153 строки
4.6 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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* NaN/Infinity code copied from the JS-library with permission from
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* Netscape Communications Corporation: http://www.mozilla.org/js
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* http://lxr.mozilla.org/seamonkey/source/js/src/jsinterp.c
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*
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*/
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/**
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* Represents a MultiplicativeExpr, an binary expression that
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* performs a multiplicative operation between it's lvalue and rvalue:
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* * : multiply
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* mod : modulus
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* div : divide
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**/
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#include "Expr.h"
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#include "ExprResult.h"
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#include <math.h>
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#include "primitives.h"
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/**
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* Creates a new MultiplicativeExpr using the given operator
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**/
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MultiplicativeExpr::MultiplicativeExpr(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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} //-- MultiplicativeExpr
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MultiplicativeExpr::~MultiplicativeExpr() {
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delete leftExpr;
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delete rightExpr;
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} //-- ~MultiplicativeExpr
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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* MultiplicativeExpr::evaluate(txIEvalContext* aContext)
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{
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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(aContext);
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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(aContext);
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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 DIVIDE:
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if (rightDbl == 0) {
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#ifdef XP_PC
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/* XXX MSVC miscompiles such that (NaN == 0) */
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if (Double::isNaN(rightDbl))
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result = Double::NaN;
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else
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#endif
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if (leftDbl == 0 || Double::isNaN(leftDbl))
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result = Double::NaN;
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else if (Double::isNeg(leftDbl) ^ Double::isNeg(rightDbl))
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result = Double::NEGATIVE_INFINITY;
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else
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result = Double::POSITIVE_INFINITY;
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}
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else
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result = leftDbl / rightDbl;
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break;
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case MODULUS:
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if (rightDbl == 0) {
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result = Double::NaN;
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}
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else {
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#ifdef XP_PC
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/* Workaround MS fmod bug where 42 % (1/0) => NaN, not 42. */
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if (!Double::isInfinite(leftDbl) && Double::isInfinite(rightDbl))
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result = leftDbl;
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else
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#endif
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result = fmod(leftDbl, rightDbl);
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}
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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 MultiplicativeExpr::toString(String& 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 DIVIDE:
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str.Append(NS_LITERAL_STRING(" div "));
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break;
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case MODULUS:
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str.Append(NS_LITERAL_STRING(" mod "));
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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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