1 /* 2 * Copyright (C) 2012 Apple Inc. All Rights Reserved. 3 * Copyright (C) 2012 Patrick Gansterer <paroga (at) paroga.com> 4 * 5 * This library is free software; you can redistribute it and/or 6 * modify it under the terms of the GNU Library General Public 7 * License as published by the Free Software Foundation; either 8 * version 2 of the License, or (at your option) any later version. 9 * 10 * This library is distributed in the hope that it will be useful, 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 13 * Library General Public License for more details. 14 * 15 * You should have received a copy of the GNU Library General Public License 16 * along with this library; see the file COPYING.LIB. If not, write to 17 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, 18 * Boston, MA 02110-1301, USA. 19 * 20 */ 21 22 #ifndef IntegerToStringConversion_h 23 #define IntegerToStringConversion_h 24 25 #include "wtf/text/StringBuilder.h" 26 #include "wtf/text/StringImpl.h" 27 28 namespace WTF { 29 30 enum PositiveOrNegativeNumber { 31 PositiveNumber, 32 NegativeNumber 33 }; 34 35 template<typename T> struct ConversionTrait; 36 37 template<> struct ConversionTrait<String> { 38 typedef PassRefPtr<StringImpl> ReturnType; 39 typedef void AdditionalArgumentType; 40 static inline ReturnType flush(LChar* characters, unsigned length, void*) { return StringImpl::create(characters, length); } 41 }; 42 template<> struct ConversionTrait<StringBuilder> { 43 typedef void ReturnType; 44 typedef StringBuilder AdditionalArgumentType; 45 static inline ReturnType flush(LChar* characters, unsigned length, StringBuilder* stringBuilder) { stringBuilder->append(characters, length); } 46 }; 47 48 template<typename T> struct UnsignedIntegerTrait; 49 50 template<> struct UnsignedIntegerTrait<int> { 51 typedef unsigned int Type; 52 }; 53 template<> struct UnsignedIntegerTrait<long> { 54 typedef unsigned long Type; 55 }; 56 template<> struct UnsignedIntegerTrait<long long> { 57 typedef unsigned long long Type; 58 }; 59 60 template<typename T, typename UnsignedIntegerType, PositiveOrNegativeNumber NumberType> 61 static typename ConversionTrait<T>::ReturnType numberToStringImpl(UnsignedIntegerType number, typename ConversionTrait<T>::AdditionalArgumentType* additionalArgument) 62 { 63 LChar buf[sizeof(UnsignedIntegerType) * 3 + 1]; 64 LChar* end = buf + WTF_ARRAY_LENGTH(buf); 65 LChar* p = end; 66 67 do { 68 *--p = static_cast<LChar>((number % 10) + '0'); 69 number /= 10; 70 } while (number); 71 72 if (NumberType == NegativeNumber) 73 *--p = '-'; 74 75 return ConversionTrait<T>::flush(p, static_cast<unsigned>(end - p), additionalArgument); 76 } 77 78 template<typename T, typename SignedIntegerType> 79 inline typename ConversionTrait<T>::ReturnType numberToStringSigned(SignedIntegerType number, typename ConversionTrait<T>::AdditionalArgumentType* additionalArgument = 0) 80 { 81 if (number < 0) 82 return numberToStringImpl<T, typename UnsignedIntegerTrait<SignedIntegerType>::Type, NegativeNumber>(-number, additionalArgument); 83 return numberToStringImpl<T, typename UnsignedIntegerTrait<SignedIntegerType>::Type, PositiveNumber>(number, additionalArgument); 84 } 85 86 template<typename T, typename UnsignedIntegerType> 87 inline typename ConversionTrait<T>::ReturnType numberToStringUnsigned(UnsignedIntegerType number, typename ConversionTrait<T>::AdditionalArgumentType* additionalArgument = 0) 88 { 89 return numberToStringImpl<T, UnsignedIntegerType, PositiveNumber>(number, additionalArgument); 90 } 91 92 } // namespace WTF 93 94 #endif // IntegerToStringConversion_h 95
