mirror of
https://github.com/classilla/tenfourfox.git
synced 2024-09-10 11:54:40 +00:00
117 lines
3.2 KiB
C++
117 lines
3.2 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
|
|
/* This Source Code Form is subject to the terms of the Mozilla Public
|
|
* License, v. 2.0. If a copy of the MPL was not distributed with this
|
|
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
|
|
|
|
#include "mozilla/FloatingPoint.h"
|
|
|
|
#include "txExpr.h"
|
|
#include <math.h>
|
|
#include "txIXPathContext.h"
|
|
|
|
nsresult
|
|
txNumberExpr::evaluate(txIEvalContext* aContext, txAExprResult** aResult)
|
|
{
|
|
*aResult = nullptr;
|
|
|
|
RefPtr<txAExprResult> exprRes;
|
|
nsresult rv = mRightExpr->evaluate(aContext, getter_AddRefs(exprRes));
|
|
NS_ENSURE_SUCCESS(rv, rv);
|
|
|
|
double rightDbl = exprRes->numberValue();
|
|
|
|
rv = mLeftExpr->evaluate(aContext, getter_AddRefs(exprRes));
|
|
NS_ENSURE_SUCCESS(rv, rv);
|
|
|
|
double leftDbl = exprRes->numberValue();
|
|
double result = 0;
|
|
|
|
switch (mOp) {
|
|
case ADD:
|
|
result = leftDbl + rightDbl;
|
|
break;
|
|
|
|
case SUBTRACT:
|
|
result = leftDbl - rightDbl;
|
|
break;
|
|
|
|
case DIVIDE:
|
|
if (rightDbl == 0) {
|
|
#if defined(XP_WIN)
|
|
/* XXX MSVC miscompiles such that (NaN == 0) */
|
|
if (mozilla::IsNaN(rightDbl))
|
|
result = mozilla::UnspecifiedNaN<double>();
|
|
else
|
|
#endif
|
|
if (leftDbl == 0 || mozilla::IsNaN(leftDbl))
|
|
result = mozilla::UnspecifiedNaN<double>();
|
|
else if (mozilla::IsNegative(leftDbl) != mozilla::IsNegative(rightDbl))
|
|
result = mozilla::NegativeInfinity<double>();
|
|
else
|
|
result = mozilla::PositiveInfinity<double>();
|
|
}
|
|
else
|
|
result = leftDbl / rightDbl;
|
|
break;
|
|
|
|
case MODULUS:
|
|
if (rightDbl == 0) {
|
|
result = mozilla::UnspecifiedNaN<double>();
|
|
}
|
|
else {
|
|
#if defined(XP_WIN)
|
|
/* Workaround MS fmod bug where 42 % (1/0) => NaN, not 42. */
|
|
if (!mozilla::IsInfinite(leftDbl) && mozilla::IsInfinite(rightDbl))
|
|
result = leftDbl;
|
|
else
|
|
#endif
|
|
result = fmod(leftDbl, rightDbl);
|
|
}
|
|
break;
|
|
|
|
case MULTIPLY:
|
|
result = leftDbl * rightDbl;
|
|
break;
|
|
}
|
|
|
|
return aContext->recycler()->getNumberResult(result, aResult);
|
|
} //-- evaluate
|
|
|
|
TX_IMPL_EXPR_STUBS_2(txNumberExpr, NUMBER_RESULT, mLeftExpr, mRightExpr)
|
|
|
|
bool
|
|
txNumberExpr::isSensitiveTo(ContextSensitivity aContext)
|
|
{
|
|
return mLeftExpr->isSensitiveTo(aContext) ||
|
|
mRightExpr->isSensitiveTo(aContext);
|
|
}
|
|
|
|
#ifdef TX_TO_STRING
|
|
void
|
|
txNumberExpr::toString(nsAString& str)
|
|
{
|
|
mLeftExpr->toString(str);
|
|
|
|
switch (mOp) {
|
|
case ADD:
|
|
str.AppendLiteral(" + ");
|
|
break;
|
|
case SUBTRACT:
|
|
str.AppendLiteral(" - ");
|
|
break;
|
|
case DIVIDE:
|
|
str.AppendLiteral(" div ");
|
|
break;
|
|
case MODULUS:
|
|
str.AppendLiteral(" mod ");
|
|
break;
|
|
case MULTIPLY:
|
|
str.AppendLiteral(" * ");
|
|
break;
|
|
}
|
|
|
|
mRightExpr->toString(str);
|
|
|
|
}
|
|
#endif
|