text: /*
   * Copyright (C) 2017 Apple Inc. All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in the
   *    documentation and/or other materials provided with the distribution.
   *
   * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
   * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
   * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
   * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
   * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
   * THE POSSIBILITY OF SUCH DAMAGE.
   */
  
  #pragma once
  
  #include <wtf/dtoa.h>
  #include <wtf/text/IntegerToStringConversion.h>
  #include <wtf/text/StringConcatenate.h>
  
  namespace WTF {
  
  template<typename SignedInt>
  class StringTypeAdapter<SignedInt, typename std::enable_if_t<std::is_integral<SignedInt>::value && std::is_signed<SignedInt>::value>> {
  public:
      StringTypeAdapter(SignedInt number)
          : m_number { number }
      {
      }
  
      unsigned length() const { return lengthOfNumberAsStringSigned(m_number); }
      bool is8Bit() const { return true; }
      template<typename CharacterType> void writeTo(CharacterType* destination) const { writeNumberToBufferSigned(m_number, destination); }
  
  private:
      SignedInt m_number;
  };
  
  template<typename UnsignedInt>
  class StringTypeAdapter<UnsignedInt, typename std::enable_if_t<std::is_integral<UnsignedInt>::value && !std::is_signed<UnsignedInt>::value>> {
  public:
      StringTypeAdapter(UnsignedInt number)
          : m_number { number }
      {
      }
  
      unsigned length() const { return lengthOfNumberAsStringUnsigned(m_number); }
      bool is8Bit() const { return true; }
      template<typename CharacterType> void writeTo(CharacterType* destination) const { writeNumberToBufferUnsigned(m_number, destination); }
  
  private:
      UnsignedInt m_number;
  };
  
  template<typename FloatingPoint>
  class StringTypeAdapter<FloatingPoint, typename std::enable_if_t<std::is_floating_point<FloatingPoint>::value>> {
  public:
      StringTypeAdapter(FloatingPoint number)
      {
          numberToString(number, m_buffer);
          m_length = std::strlen(&m_buffer[0]);
      }
  
      unsigned length() const { return m_length; }
      bool is8Bit() const { return true; }
      template<typename CharacterType> void writeTo(CharacterType* destination) const { StringImpl::copyCharacters(destination, buffer(), m_length); }
  
  private:
      const LChar* buffer() const { return reinterpret_cast<const LChar*>(&m_buffer[0]); }
  
      NumberToStringBuffer m_buffer;
      unsigned m_length;
  };
  
  class FormattedNumber {
  public:
      static FormattedNumber fixedPrecision(double number, unsigned significantFigures = 6, TrailingZerosTruncatingPolicy trailingZerosTruncatingPolicy = TruncateTrailingZeros)
      {
          FormattedNumber numberFormatter;
          numberToFixedPrecisionString(number, significantFigures, numberFormatter.m_buffer, trailingZerosTruncatingPolicy == TruncateTrailingZeros);
          numberFormatter.m_length = std::strlen(&numberFormatter.m_buffer[0]);
          return numberFormatter;
      }
  
      static FormattedNumber fixedWidth(double number, unsigned decimalPlaces)
      {
          FormattedNumber numberFormatter;
          numberToFixedWidthString(number, decimalPlaces, numberFormatter.m_buffer);
          numberFormatter.m_length = std::strlen(&numberFormatter.m_buffer[0]);
          return numberFormatter;
      }
  
      unsigned length() const { return m_length; }
      const LChar* buffer() const { return reinterpret_cast<const LChar*>(&m_buffer[0]); }
  
  private:
      NumberToStringBuffer m_buffer;
      unsigned m_length;
  };
  
  template<> class StringTypeAdapter<FormattedNumber> {
  public:
      StringTypeAdapter(const FormattedNumber& number)
          : m_number { number }
      {
      }
  
      unsigned length() const { return m_number.length(); }
      bool is8Bit() const { return true; }
      template<typename CharacterType> void writeTo(CharacterType* destination) const { StringImpl::copyCharacters(destination, m_number.buffer(), m_number.length()); }
  
  private:
      const FormattedNumber& m_number;
  };
  
  }
  
  using WTF::FormattedNumber;
  