third_party/WebKit/Source/wtf/dtoa.h

   1 /*
   2  *  Copyright (C) 2003, 2008, 2012 Apple Inc. All rights reserved.
   3  *
   4  *  This library is free software; you can redistribute it and/or
   5  *  modify it under the terms of the GNU Library General Public
   6  *  License as published by the Free Software Foundation; either
   7  *  version 2 of the License, or (at your option) any later version.
   8  *
   9  *  This library is distributed in the hope that it will be useful,
  10  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  *  Library General Public License for more details.
  13  *
  14  *  You should have received a copy of the GNU Library General Public License
  15  *  along with this library; see the file COPYING.LIB.  If not, write to
  16  *  the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  17  *  Boston, MA 02110-1301, USA.
  18  *
  19  */
  20
  21 #ifndef WTF_dtoa_h
  22 #define WTF_dtoa_h
  23
  24 #include "wtf/ASCIICType.h"
  25 #include "wtf/WTFExport.h"
  26 #include "wtf/dtoa/double-conversion.h"
  27 #include "wtf/text/Unicode.h"
  28
  29 namespace WTF {
  30
  31 class Mutex;
  32
  33 extern Mutex* s_dtoaP5Mutex;
  34
  35 typedef char DtoaBuffer[80];
  36
  37 WTF_EXPORT void dtoa(DtoaBuffer result, double dd, bool& sign, int& exponent, unsigned& precision);
  38 WTF_EXPORT void dtoaRoundSF(DtoaBuffer result, double dd, int ndigits, bool& sign, int& exponent, unsigned& precision);
  39 WTF_EXPORT void dtoaRoundDP(DtoaBuffer result, double dd, int ndigits, bool& sign, int& exponent, unsigned& precision);
  40
  41 // Size = 80 for sizeof(DtoaBuffer) + some sign bits, decimal point, 'e', exponent digits.
  42 const unsigned NumberToStringBufferLength = 96;
  43 typedef char NumberToStringBuffer[NumberToStringBufferLength];
  44 typedef LChar NumberToLStringBuffer[NumberToStringBufferLength];
  45
  46 WTF_EXPORT const char* numberToString(double, NumberToStringBuffer);
  47 WTF_EXPORT const char* numberToFixedPrecisionString(double, unsigned significantFigures, NumberToStringBuffer, bool truncateTrailingZeros = false);
  48 WTF_EXPORT const char* numberToFixedWidthString(double, unsigned decimalPlaces, NumberToStringBuffer);
  49
  50 WTF_EXPORT double parseDouble(const LChar* string, size_t length, size_t& parsedLength);
  51 WTF_EXPORT double parseDouble(const UChar* string, size_t length, size_t& parsedLength);
  52
  53 namespace Internal {
  54     double parseDoubleFromLongString(const UChar* string, size_t length, size_t& parsedLength);
  55 }
  56
  57 inline double parseDouble(const LChar* string, size_t length, size_t& parsedLength)
  58 {
  59     return double_conversion::StringToDoubleConverter::StringToDouble(reinterpret_cast<const char*>(string), length, &parsedLength);
  60 }
  61
  62 inline double parseDouble(const UChar* string, size_t length, size_t& parsedLength)
  63 {
  64     const size_t conversionBufferSize = 64;
  65     if (length > conversionBufferSize)
  66         return Internal::parseDoubleFromLongString(string, length, parsedLength);
  67     LChar conversionBuffer[conversionBufferSize];
  68     for (size_t i = 0; i < length; ++i)
  69         conversionBuffer[i] = isASCII(string[i]) ? static_cast<LChar>(string[i]) : 0;
  70     return parseDouble(conversionBuffer, length, parsedLength);
  71 }
  72
  73 } // namespace WTF
  74
  75 using WTF::NumberToStringBuffer;
  76 using WTF::NumberToLStringBuffer;
  77 using WTF::numberToString;
  78 using WTF::numberToFixedPrecisionString;
  79 using WTF::numberToFixedWidthString;
  80 using WTF::parseDouble;
  81
  82 #endif // WTF_dtoa_h