Diff: u32string.h

Revision:

0:b47c2a7920c2

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/u32string.h	Fri Mar 16 16:34:18 2018 +0000
@@ -0,0 +1,224 @@
+///\file
+
+/******************************************************************************
+The MIT License(MIT)
+
+Embedded Template Library.
+https://github.com/ETLCPP/etl
+http://www.etlcpp.com
+
+Copyright(c) 2016 jwellbelove
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files(the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and / or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions :
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+******************************************************************************/
+
+#ifndef __ETL_U32STRING__
+#define __ETL_U32STRING__
+
+#include "platform.h"
+#include "basic_string.h"
+#include "hash.h"
+
+#if defined(ETL_COMPILER_MICROSOFT)
+  #undef min
+#endif
+
+namespace etl
+{
+  typedef ibasic_string<char32_t> iu32string;
+
+  //***************************************************************************
+  /// A u32string implementation that uses a fixed size buffer.
+  ///\tparam MAX_SIZE_ The maximum number of elements that can be stored.
+  ///\ingroup u32string
+  //***************************************************************************
+  template <const size_t MAX_SIZE_>
+  class u32string : public iu32string
+  {
+  public:
+
+    typedef iu32string::value_type value_type;
+
+    static const size_t MAX_SIZE = MAX_SIZE_;
+
+    //*************************************************************************
+    /// Constructor.
+    //*************************************************************************
+    u32string()
+      : iu32string(reinterpret_cast<value_type*>(&buffer), MAX_SIZE)
+    {
+      iu32string::initialise();
+    }
+
+    //*************************************************************************
+    /// Copy constructor.
+    ///\param other The other string.
+    //*************************************************************************
+    u32string(const etl::u32string<MAX_SIZE_>& other)
+      : iu32string(reinterpret_cast<value_type*>(&buffer), MAX_SIZE)
+    {
+      iu32string::initialise();
+      iu32string::assign(other.begin(), other.end());
+    }
+
+    //*************************************************************************
+    /// From other string, position, length.
+    ///\param other The other string.
+    ///\param position The position of the first character.
+    ///\param length   The number of characters. Default = npos.
+    //*************************************************************************
+    u32string(const etl::u32string<MAX_SIZE_>& other, size_t position, size_t length_ = npos)
+      : iu32string(reinterpret_cast<value_type*>(&buffer), MAX_SIZE)
+    {
+      ETL_ASSERT(position < other.size(), ETL_ERROR(string_out_of_bounds));
+
+      // Set the length to the exact amount.
+      length_ = (length_ > MAX_SIZE_) ? MAX_SIZE_ : length_;
+
+      iu32string::initialise();
+      iu32string::assign(other.begin() + position, other.begin() + position + length_);
+    }
+
+    //*************************************************************************
+    /// Constructor, from null terminated text.
+    ///\param text The initial text of the u32string.
+    //*************************************************************************
+    u32string(const value_type* text)
+      : iu32string(reinterpret_cast<value_type*>(&buffer), MAX_SIZE)
+    {
+      iu32string::initialise();
+      iu32string::assign(text, text + etl::char_traits<value_type>::length(text));
+    }
+
+    //*************************************************************************
+    /// Constructor, from null terminated text and count.
+    ///\param text  The initial text of the u32string.
+    ///\param count The number of characters to copy.
+    //*************************************************************************
+    u32string(const value_type* text, size_t count)
+      : iu32string(reinterpret_cast<value_type*>(&buffer), MAX_SIZE)
+    {
+      iu32string::initialise();
+      iu32string::assign(text, text + count);
+    }
+
+    //*************************************************************************
+    /// Constructor, from initial size and value.
+    ///\param initialSize  The initial size of the u32string.
+    ///\param value        The value to fill the u32string with.
+    //*************************************************************************
+    u32string(size_t count, value_type c)
+      : iu32string(reinterpret_cast<value_type*>(&buffer), MAX_SIZE)
+    {
+      iu32string::initialise();
+      iu32string::resize(count, c);
+    }
+
+    //*************************************************************************
+    /// Constructor, from an iterator range.
+    ///\tparam TIterator The iterator type.
+    ///\param first The iterator to the first element.
+    ///\param last  The iterator to the last element + 1.
+    //*************************************************************************
+    template <typename TIterator>
+    u32string(TIterator first, TIterator last)
+      : iu32string(reinterpret_cast<value_type*>(&buffer), MAX_SIZE)
+    {
+      iu32string::assign(first, last);
+    }
+
+    //*************************************************************************
+    /// Returns a sub-string.
+    ///\param position The position of the first character. Default = 0.
+    ///\param length   The number of characters. Default = npos.
+    //*************************************************************************
+    etl::u32string<MAX_SIZE_> substr(size_t position = 0, size_t length_ = npos) const
+    {
+      etl::u32string<MAX_SIZE_> new_string;
+
+      if (position != size())
+      {
+        ETL_ASSERT(position < size(), ETL_ERROR(string_out_of_bounds));
+
+        length_ = std::min(length_, size() - position);
+
+        new_string.assign(buffer + position, buffer + position + length_);
+      }
+
+      return new_string;
+    }
+
+    //*************************************************************************
+    /// Assignment operator.
+    //*************************************************************************
+    u32string& operator = (const u32string& rhs)
+    {
+      if (&rhs != this)
+      {
+        iu32string::assign(rhs.cbegin(), rhs.cend());
+      }
+
+      return *this;
+    }
+
+    //*************************************************************************
+    /// Fix the internal pointers after a low level memory copy.
+    //*************************************************************************
+    void repair()
+    {
+      etl::iu32string::repair(buffer);
+    }
+
+  private:
+
+    value_type buffer[MAX_SIZE + 1];
+  };
+
+  //*************************************************************************
+  /// Hash function.
+  //*************************************************************************
+#if ETL_8BIT_SUPPORT
+  template <>
+  struct hash<etl::iu32string>
+  {
+    size_t operator()(const etl::iu32string& text) const
+    {
+      return etl::__private_hash__::generic_hash<size_t>(reinterpret_cast<const uint8_t*>(&text[0]),
+                                                         reinterpret_cast<const uint8_t*>(&text[text.size()]));
+    }
+  };
+
+  template <const size_t SIZE>
+  struct hash<etl::u32string<SIZE> >
+  {
+    size_t operator()(const etl::u32string<SIZE>& text) const
+    {
+      return etl::__private_hash__::generic_hash<size_t>(reinterpret_cast<const uint8_t*>(&text[0]),
+                                                         reinterpret_cast<const uint8_t*>(&text[text.size()]));
+    }
+  };
+#endif
+}
+
+#if defined(ETL_COMPILER_MICROSOFT)
+    #define min(a,b) (((a) < (b)) ? (a) : (b))
+#endif
+
+#endif
+