u8string.h

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/******************************************************************************
The MIT License(MIT)
 
Embedded Template Library.
https://github.com/ETLCPP/etl
https://www.etlcpp.com
 
Copyright(c) 2023 John Wellbelove
 
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files(the "Software"), to deal
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******************************************************************************/
 
#ifndef ETL_U8STRING_INCLUDED
#define ETL_U8STRING_INCLUDED
 
#include "platform.h"
#include "basic_string.h"
#include "string_view.h"
#include "hash.h"
#include "initializer_list.h"
 
#include <ctype.h>
 
#include "private/minmax_push.h"
 
#if ETL_HAS_CHAR8_T
namespace etl
{
#if ETL_USING_CPP11 && ETL_HAS_NATIVE_CHAR8_T
  inline namespace literals
  {
    inline namespace string_literals
    {
      inline constexpr etl::u8string_view operator ""_sv(const char8_t* str, size_t length) ETL_NOEXCEPT
      {
        return etl::u8string_view{ str, length };
      }
    }
  }
#endif
 
  typedef etl::ibasic_string<char8_t> iu8string;
 
  //***************************************************************************
  //***************************************************************************
  template <size_t MAX_SIZE_>
  class u8string : public iu8string
  {
  public:
 
    typedef iu8string base_type;
    typedef iu8string interface_type;
 
    typedef iu8string::value_type value_type;
 
    static ETL_CONSTANT size_t MAX_SIZE = MAX_SIZE_;
 
    //*************************************************************************
    //*************************************************************************
    u8string()
      : iu8string(reinterpret_cast<value_type*>(&buffer), MAX_SIZE)
    {
      this->initialise();
    }
 
    //*************************************************************************
    //*************************************************************************
    u8string(const etl::u8string<MAX_SIZE_>& other)
      : iu8string(reinterpret_cast<value_type*>(&buffer), MAX_SIZE)
    {
      this->initialise();
      this->assign(other);
    }
 
    //*************************************************************************
    //*************************************************************************
    u8string(const etl::iu8string& other)
      : iu8string(reinterpret_cast<value_type*>(&buffer), MAX_SIZE)
    {
      this->initialise();
      this->assign(other);
    }
 
    //*************************************************************************
    //*************************************************************************
    u8string(const etl::iu8string& other, size_t position, size_t length = npos)
      : iu8string(reinterpret_cast<value_type*>(&buffer), MAX_SIZE)
    {
      ETL_ASSERT(position < other.size(), ETL_ERROR(string_out_of_bounds));
 
      this->initialise();
      this->assign(other, position, length);
    }
 
    //*************************************************************************
    //*************************************************************************
    ETL_EXPLICIT_STRING_FROM_CHAR u8string(const value_type* text)
      : iu8string(reinterpret_cast<value_type*>(&buffer), MAX_SIZE)
    {
      this->initialise();
      this->assign(text);
    }
 
    //*************************************************************************
    //*************************************************************************
    u8string(const value_type* text, size_t count)
      : iu8string(reinterpret_cast<value_type*>(&buffer), MAX_SIZE)
    {
      this->initialise();
      this->assign(text, text + count);
    }
 
    //*************************************************************************
    //*************************************************************************
    u8string(size_type count, value_type c)
      : iu8string(reinterpret_cast<value_type*>(&buffer), MAX_SIZE)
    {
      this->initialise();
      this->resize(count, c);
    }
 
    //*************************************************************************
    //*************************************************************************
    template <typename TIterator>
    u8string(TIterator first, TIterator last, typename etl::enable_if<!etl::is_integral<TIterator>::value, int>::type = 0)
      : iu8string(reinterpret_cast<value_type*>(&buffer), MAX_SIZE)
    {
      this->initialise();
      this->assign(first, last);
    }
 
#if ETL_HAS_INITIALIZER_LIST
    //*************************************************************************
    //*************************************************************************
    u8string(std::initializer_list<value_type> init)
      : iu8string(reinterpret_cast<value_type*>(&buffer), MAX_SIZE)
    {
      this->initialise();
      this->assign(init.begin(), init.end());
    }
#endif
 
    //*************************************************************************
    //*************************************************************************
    explicit u8string(const etl::u8string_view& view)
      : iu8string(reinterpret_cast<value_type*>(&buffer), MAX_SIZE)
    {
      this->initialise();
      this->assign(view.begin(), view.end());
    }
 
    //*************************************************************************
    //*************************************************************************
    etl::u8string<MAX_SIZE_> substr(size_type position = 0, size_type length_ = npos) const
    {
      etl::u8string<MAX_SIZE_> new_string;
 
      if (position != this->size())
      {
        ETL_ASSERT(position < this->size(), ETL_ERROR(string_out_of_bounds));
 
        length_ = etl::min(length_, this->size() - position);
 
        new_string.assign(buffer + position, buffer + position + length_);
      }
 
      return new_string;
    }
 
    //*************************************************************************
    //*************************************************************************
    u8string& operator = (const u8string& rhs)
    {
      if (&rhs != this)
      {
        this->assign(rhs);
      }
 
      return *this;
    }
 
 
    //*************************************************************************
    //*************************************************************************
    u8string& operator = (const iu8string& rhs)
    {
      if (&rhs != this)
      {
        this->assign(rhs);
      }
 
      return *this;
    }
 
    //*************************************************************************
    //*************************************************************************
    u8string& operator = (const value_type* text)
    {
      this->assign(text);
 
      return *this;
    }
 
    //*************************************************************************
    //*************************************************************************
    u8string& operator = (const etl::u8string_view& view)
    {
      this->assign(view);
 
      return *this;
    }
 
    //*************************************************************************
    //*************************************************************************
#if ETL_HAS_ISTRING_REPAIR
    virtual void repair() ETL_OVERRIDE
#else
    void repair()
#endif
    {
      etl::iu8string::repair_buffer(buffer);
    }
 
  private:
 
    value_type buffer[MAX_SIZE + 1];
  };
 
  template <size_t MAX_SIZE_>
  ETL_CONSTANT size_t u8string<MAX_SIZE_>::MAX_SIZE;
 
  //***************************************************************************
  //***************************************************************************
  class u8string_ext : public iu8string
  {
  public:
 
    typedef iu8string base_type;
    typedef iu8string interface_type;
 
    typedef iu8string::value_type value_type;
    typedef iu8string::size_type size_type;
 
    //*************************************************************************
    //*************************************************************************
    u8string_ext(value_type* buffer, size_type buffer_size)
      : iu8string(buffer, buffer_size - 1U)
    {
      this->initialise();
    }
 
    //*************************************************************************
    //*************************************************************************
    u8string_ext(const etl::u8string_ext& other, value_type* buffer, size_type buffer_size)
      : iu8string(buffer, buffer_size - 1U)
    {
      if (this->is_within_buffer(other.data()))
      {
        this->current_size = other.size();
      }
      else
      {
        this->initialise();
        this->assign(other);
      }
    }
 
    //*************************************************************************
    //*************************************************************************
    u8string_ext(const etl::iu8string& other, value_type* buffer, size_type buffer_size)
      : iu8string(buffer, buffer_size - 1U)
    {
      if (this->is_within_buffer(other.data()))
      {
        this->current_size = other.size();
      }
      else
      {
        this->initialise();
        this->assign(other);
      }
    }
 
    //*************************************************************************
    //*************************************************************************
    u8string_ext(const etl::iu8string& other, value_type* buffer, size_type buffer_size, size_type position, size_type length = npos)
      : iu8string(buffer, buffer_size - 1U)
    {
      ETL_ASSERT(position < other.size(), ETL_ERROR(string_out_of_bounds));
 
      if (this->is_within_buffer(other.data()))
      {
        this->current_size = other.size();
      }
      else
      {
        this->initialise();
        this->assign(other, position, length);
      }
    }
 
    //*************************************************************************
    //*************************************************************************
    template <typename TPointer>
    u8string_ext(TPointer text, value_type* buffer, size_type buffer_size,
                 typename etl::enable_if<etl::is_same<const value_type*, TPointer>::value, int>::type* = ETL_NULLPTR)
      : iu8string(buffer, buffer_size - 1U)
    {
      if (this->is_within_buffer(text))
      {
        this->current_size = etl::strlen(buffer);
      }
      else
      {
        this->initialise();
        this->assign(text, text + etl::strlen(text));
      }
    }
 
    //*************************************************************************
    //*************************************************************************
    template <size_t Size>
    u8string_ext(const value_type (&literal)[Size], value_type* buffer, size_type buffer_size)
      : iu8string(buffer, buffer_size - 1U)
    {
      if (this->is_within_buffer(literal))
      {
        this->current_size = etl::strlen(literal);
      }
      else
      {
        this->initialise();
        this->assign(literal);
      }
    }
 
    //*************************************************************************
    //*************************************************************************
    u8string_ext(const value_type* text, size_type count, value_type* buffer, size_type buffer_size)
      : iu8string(buffer, buffer_size - 1U)
    {
      if (this->is_within_buffer(text))
      {
        this->current_size = count;
      }
      else
      {
        this->initialise();
        this->assign(text, text + count);
      }
    }
 
    //*************************************************************************
    //*************************************************************************
    u8string_ext(size_type count, value_type c, value_type* buffer, size_type buffer_size)
      : iu8string(buffer, buffer_size - 1U)
    {
      this->initialise();
      this->resize(count, c);
    }
 
    //*************************************************************************
    //*************************************************************************
    explicit u8string_ext(const etl::u8string_view& view, value_type* buffer, size_type buffer_size)
      : iu8string(buffer, buffer_size - 1U)
    {
      if (this->is_within_buffer(view.data()))
      {
        this->current_size = view.size();
      }
      else
      {
        this->initialise();
        this->assign(view.begin(), view.end());
      }
    }
 
    //*************************************************************************
    //*************************************************************************
    template <typename TIterator>
    u8string_ext(TIterator first, TIterator last, value_type* buffer, size_type buffer_size, typename etl::enable_if<!etl::is_integral<TIterator>::value, int>::type = 0)
      : iu8string(buffer, buffer_size - 1U)
    {
      if (this->is_within_buffer(etl::addressof(*first)))
      {
        this->current_size = etl::distance(first, last);
      }
      else
      {
        this->initialise();
        this->assign(first, last);
      }     
    }
 
#if ETL_HAS_INITIALIZER_LIST
    //*************************************************************************
    //*************************************************************************
    u8string_ext(std::initializer_list<value_type> init, value_type* buffer, size_type buffer_size)
      : iu8string(buffer, buffer_size - 1U)
    {
      this->initialise();
      this->assign(init.begin(), init.end());
    }
#endif
 
    //*************************************************************************
    //*************************************************************************
    u8string_ext& operator = (const u8string_ext& rhs)
    {
      if (&rhs != this)
      {
        this->assign(rhs);
      }
 
      return *this;
    }
 
    //*************************************************************************
    //*************************************************************************
    u8string_ext& operator = (const iu8string& rhs)
    {
      if (&rhs != this)
      {
        this->assign(rhs);
      }
 
      return *this;
    }
 
    //*************************************************************************
    //*************************************************************************
    u8string_ext& operator = (const value_type* text)
    {
      this->assign(text);
 
      return *this;
    }
 
    //*************************************************************************
    //*************************************************************************
    u8string_ext& operator = (const etl::u8string_view& view)
    {
      this->assign(view);
 
      return *this;
    }
 
    //*************************************************************************
    //*************************************************************************
#if ETL_HAS_ISTRING_REPAIR
    virtual void repair() ETL_OVERRIDE
#else
    void repair()
#endif
    {
    }
 
  private:
 
    //*************************************************************************
    //*************************************************************************
    u8string_ext(const u8string_ext& other) ETL_DELETE;
  };
 
  //*************************************************************************
  //*************************************************************************
#if ETL_USING_8BIT_TYPES
#include "private/diagnostic_useless_cast_push.h"
  template <>
  struct hash<etl::iu8string>
  {
    size_t operator()(const etl::iu8string& text) const
    {
      return etl::private_hash::generic_hash<size_t>(reinterpret_cast<const uint8_t*>(text.data()),
                                                     reinterpret_cast<const uint8_t*>(text.data() + text.size()));
    }
  };
 
  template <size_t SIZE>
  struct hash<etl::u8string<SIZE> >
  {
    size_t operator()(const etl::u8string<SIZE>& text) const
    {
      return etl::private_hash::generic_hash<size_t>(reinterpret_cast<const uint8_t*>(text.data()),
                                                     reinterpret_cast<const uint8_t*>(text.data() + text.size()));
    }
  };
 
  template <>
  struct hash<etl::u8string_ext>
  {
    size_t operator()(const etl::u8string_ext& text) const
    {
      return etl::private_hash::generic_hash<size_t>(reinterpret_cast<const uint8_t*>(text.data()),
                                                     reinterpret_cast<const uint8_t*>(text.data() + text.size()));
    }
  };
#include "private/diagnostic_pop.h"
#endif
 
  //***************************************************************************
  //***************************************************************************
  template<size_t Array_Size>
  etl::u8string<Array_Size - 1U> make_string(const char(&text)[Array_Size])
  {
    return etl::u8string<Array_Size - 1U>(text, etl::strlen(text, Array_Size - 1));
  }
 
  //***************************************************************************
  //***************************************************************************
  template<size_t MAX_SIZE, size_t SIZE>
  etl::u8string<MAX_SIZE> make_string_with_capacity(const char(&text)[SIZE])
  {
    return etl::u8string<MAX_SIZE>(text, etl::strlen(text, SIZE));
  }
}
#endif
 
#include "private/minmax_pop.h"
 
#endif