mirror of
https://github.com/mozilla/gecko-dev.git
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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 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "mozilla/FloatingPoint.h"
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#include "txExpr.h"
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#include <math.h>
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#include "txIXPathContext.h"
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nsresult
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txNumberExpr::evaluate(txIEvalContext* aContext, txAExprResult** aResult)
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{
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*aResult = nullptr;
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nsRefPtr<txAExprResult> exprRes;
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nsresult rv = mRightExpr->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 = mLeftExpr->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 (mOp) {
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case ADD:
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result = leftDbl + rightDbl;
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break;
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case SUBTRACT:
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result = leftDbl - rightDbl;
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break;
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case DIVIDE:
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if (rightDbl == 0) {
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#if defined(XP_WIN)
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/* XXX MSVC miscompiles such that (NaN == 0) */
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if (mozilla::IsNaN(rightDbl))
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result = mozilla::UnspecifiedNaN<double>();
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else
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#endif
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if (leftDbl == 0 || mozilla::IsNaN(leftDbl))
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result = mozilla::UnspecifiedNaN<double>();
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else if (mozilla::IsNegative(leftDbl) != mozilla::IsNegative(rightDbl))
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result = mozilla::NegativeInfinity<double>();
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else
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result = mozilla::PositiveInfinity<double>();
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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 = mozilla::UnspecifiedNaN<double>();
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}
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else {
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#if defined(XP_WIN)
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/* Workaround MS fmod bug where 42 % (1/0) => NaN, not 42. */
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if (!mozilla::IsInfinite(leftDbl) && mozilla::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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case MULTIPLY:
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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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TX_IMPL_EXPR_STUBS_2(txNumberExpr, NUMBER_RESULT, mLeftExpr, mRightExpr)
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bool
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txNumberExpr::isSensitiveTo(ContextSensitivity aContext)
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{
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return mLeftExpr->isSensitiveTo(aContext) ||
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mRightExpr->isSensitiveTo(aContext);
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}
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#ifdef TX_TO_STRING
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void
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txNumberExpr::toString(nsAString& str)
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{
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mLeftExpr->toString(str);
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switch (mOp) {
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case ADD:
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str.AppendLiteral(" + ");
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break;
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case SUBTRACT:
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str.AppendLiteral(" - ");
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break;
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case DIVIDE:
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str.AppendLiteral(" div ");
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break;
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case MODULUS:
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str.AppendLiteral(" mod ");
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break;
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case MULTIPLY:
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str.AppendLiteral(" * ");
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break;
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}
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mRightExpr->toString(str);
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}
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#endif
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