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/dtoa/double-conversion.h"
26 #include "wtf/unicode/Unicode.h"
27 #include "wtf/WTFExport.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
parseDouble(const LChar * string,size_t length,size_t & parsedLength)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
parseDouble(const UChar * string,size_t length,size_t & parsedLength)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 (int i = 0; i < static_cast<int>(length); ++i)
69 conversionBuffer[i] = isASCII(string[i]) ? 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
83