mirror of
https://github.com/classilla/tenfourfox.git
synced 2024-09-10 11:54:40 +00:00
216 lines
5.7 KiB
C++
216 lines
5.7 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 "nsString.h"
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#include "txCore.h"
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#include "txXMLUtils.h"
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#include <math.h>
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#include <stdlib.h>
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#include <algorithm>
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#ifdef WIN32
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#include <float.h>
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#endif
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#include "prdtoa.h"
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/*
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* Utility class for doubles
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*/
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/*
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* Converts the given String to a double, if the String value does not
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* represent a double, NaN will be returned
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*/
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class txStringToDouble
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{
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public:
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typedef char16_t input_type;
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typedef char16_t value_type;
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txStringToDouble(): mState(eWhitestart), mSign(ePositive) {}
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void
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write(const input_type* aSource, uint32_t aSourceLength)
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{
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if (mState == eIllegal) {
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return;
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}
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uint32_t i = 0;
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char16_t c;
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for ( ; i < aSourceLength; ++i) {
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c = aSource[i];
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switch (mState) {
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case eWhitestart:
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if (c == '-') {
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mState = eDecimal;
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mSign = eNegative;
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}
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else if (c >= '0' && c <= '9') {
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mState = eDecimal;
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mBuffer.Append((char)c);
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}
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else if (c == '.') {
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mState = eMantissa;
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mBuffer.Append((char)c);
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}
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else if (!XMLUtils::isWhitespace(c)) {
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mState = eIllegal;
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return;
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}
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break;
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case eDecimal:
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if (c >= '0' && c <= '9') {
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mBuffer.Append((char)c);
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}
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else if (c == '.') {
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mState = eMantissa;
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mBuffer.Append((char)c);
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}
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else if (XMLUtils::isWhitespace(c)) {
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mState = eWhiteend;
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}
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else {
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mState = eIllegal;
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return;
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}
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break;
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case eMantissa:
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if (c >= '0' && c <= '9') {
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mBuffer.Append((char)c);
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}
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else if (XMLUtils::isWhitespace(c)) {
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mState = eWhiteend;
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}
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else {
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mState = eIllegal;
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return;
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}
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break;
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case eWhiteend:
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if (!XMLUtils::isWhitespace(c)) {
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mState = eIllegal;
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return;
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}
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break;
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default:
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break;
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}
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}
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}
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double
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getDouble()
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{
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if (mState == eIllegal || mBuffer.IsEmpty() ||
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(mBuffer.Length() == 1 && mBuffer[0] == '.')) {
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return mozilla::UnspecifiedNaN<double>();
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}
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return mSign*PR_strtod(mBuffer.get(), 0);
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}
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private:
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nsAutoCString mBuffer;
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enum {
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eWhitestart,
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eDecimal,
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eMantissa,
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eWhiteend,
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eIllegal
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} mState;
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enum {
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eNegative = -1,
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ePositive = 1
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} mSign;
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};
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double txDouble::toDouble(const nsAString& aSrc)
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{
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txStringToDouble sink;
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nsAString::const_iterator fromBegin, fromEnd;
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copy_string(aSrc.BeginReading(fromBegin), aSrc.EndReading(fromEnd), sink);
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return sink.getDouble();
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}
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/*
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* Converts the value of the given double to a String, and places
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* The result into the destination String.
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* @return the given dest string
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*/
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void txDouble::toString(double aValue, nsAString& aDest)
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{
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// check for special cases
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if (mozilla::IsNaN(aValue)) {
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aDest.AppendLiteral("NaN");
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return;
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}
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if (mozilla::IsInfinite(aValue)) {
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if (aValue < 0)
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aDest.Append(char16_t('-'));
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aDest.AppendLiteral("Infinity");
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return;
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}
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// Mantissa length is 17, so this is plenty
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const int buflen = 20;
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char buf[buflen];
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int intDigits, sign;
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char* endp;
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PR_dtoa(aValue, 0, 0, &intDigits, &sign, &endp, buf, buflen - 1);
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// compute length
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int32_t length = endp - buf;
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if (length > intDigits) {
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// decimal point needed
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++length;
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if (intDigits < 1) {
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// leading zeros, -intDigits + 1
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length += 1 - intDigits;
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}
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}
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else {
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// trailing zeros, total length given by intDigits
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length = intDigits;
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}
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if (aValue < 0)
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++length;
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// grow the string
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uint32_t oldlength = aDest.Length();
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if (!aDest.SetLength(oldlength + length, mozilla::fallible))
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return; // out of memory
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nsAString::iterator dest;
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aDest.BeginWriting(dest).advance(int32_t(oldlength));
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if (aValue < 0) {
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*dest = '-'; ++dest;
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}
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int i;
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// leading zeros
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if (intDigits < 1) {
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*dest = '0'; ++dest;
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*dest = '.'; ++dest;
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for (i = 0; i > intDigits; --i) {
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*dest = '0'; ++dest;
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}
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}
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// mantissa
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int firstlen = std::min<size_t>(intDigits, endp - buf);
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for (i = 0; i < firstlen; i++) {
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*dest = buf[i]; ++dest;
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}
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if (i < endp - buf) {
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if (i > 0) {
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*dest = '.'; ++dest;
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}
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for (; i < endp - buf; i++) {
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*dest = buf[i]; ++dest;
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}
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}
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// trailing zeros
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for (; i < intDigits; i++) {
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*dest = '0'; ++dest;
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}
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}
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