gecko-dev/xpcom/string/nsString.h

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#ifndef nsString_h___
#define nsString_h___

#include "mozilla/Attributes.h"

#include "nsSubstring.h"
#include "nsDependentSubstring.h"
#include "nsReadableUtils.h"

#include <new>

// enable support for the obsolete string API if not explicitly disabled
#ifndef MOZ_STRING_WITH_OBSOLETE_API
#define MOZ_STRING_WITH_OBSOLETE_API 1
#endif

#if MOZ_STRING_WITH_OBSOLETE_API
// radix values for ToInteger/AppendInt
#define kRadix10        (10)
#define kRadix16        (16)
#define kAutoDetect     (100)
#endif


// declare nsString, et. al.
#include "string-template-def-unichar.h"
#include "nsTString.h"
#include "string-template-undef.h"

// declare nsCString, et. al.
#include "string-template-def-char.h"
#include "nsTString.h"
#include "string-template-undef.h"

static_assert(sizeof(char16_t) == 2, "size of char16_t must be 2");
static_assert(sizeof(nsString::char_type) == 2,
              "size of nsString::char_type must be 2");
static_assert(nsString::char_type(-1) > nsString::char_type(0),
              "nsString::char_type must be unsigned");
static_assert(sizeof(nsCString::char_type) == 1,
              "size of nsCString::char_type must be 1");


/**
 * A helper class that converts a UTF-16 string to ASCII in a lossy manner
 */
class NS_LossyConvertUTF16toASCII : public nsAutoCString
{
public:
  explicit NS_LossyConvertUTF16toASCII(const char16ptr_t aString)
  {
    LossyAppendUTF16toASCII(aString, *this);
  }

  NS_LossyConvertUTF16toASCII(const char16ptr_t aString, uint32_t aLength)
  {
    LossyAppendUTF16toASCII(Substring(aString, aLength), *this);
  }

  explicit NS_LossyConvertUTF16toASCII(const nsAString& aString)
  {
    LossyAppendUTF16toASCII(aString, *this);
  }

private:
  // NOT TO BE IMPLEMENTED
  NS_LossyConvertUTF16toASCII(char) = delete;
};


class NS_ConvertASCIItoUTF16 : public nsAutoString
{
public:
  explicit NS_ConvertASCIItoUTF16(const char* aCString)
  {
    AppendASCIItoUTF16(aCString, *this);
  }

  NS_ConvertASCIItoUTF16(const char* aCString, uint32_t aLength)
  {
    AppendASCIItoUTF16(Substring(aCString, aLength), *this);
  }

  explicit NS_ConvertASCIItoUTF16(const nsACString& aCString)
  {
    AppendASCIItoUTF16(aCString, *this);
  }

private:
  // NOT TO BE IMPLEMENTED
  NS_ConvertASCIItoUTF16(char16_t) = delete;
};


/**
 * A helper class that converts a UTF-16 string to UTF-8
 */
class NS_ConvertUTF16toUTF8 : public nsAutoCString
{
public:
  explicit NS_ConvertUTF16toUTF8(const char16ptr_t aString)
  {
    AppendUTF16toUTF8(aString, *this);
  }

  NS_ConvertUTF16toUTF8(const char16ptr_t aString, uint32_t aLength)
  {
    AppendUTF16toUTF8(Substring(aString, aLength), *this);
  }

  explicit NS_ConvertUTF16toUTF8(const nsAString& aString)
  {
    AppendUTF16toUTF8(aString, *this);
  }

private:
  // NOT TO BE IMPLEMENTED
  NS_ConvertUTF16toUTF8(char) = delete;
};


class NS_ConvertUTF8toUTF16 : public nsAutoString
{
public:
  explicit NS_ConvertUTF8toUTF16(const char* aCString)
  {
    AppendUTF8toUTF16(aCString, *this);
  }

  NS_ConvertUTF8toUTF16(const char* aCString, uint32_t aLength)
  {
    AppendUTF8toUTF16(Substring(aCString, aLength), *this);
  }

  explicit NS_ConvertUTF8toUTF16(const nsACString& aCString)
  {
    AppendUTF8toUTF16(aCString, *this);
  }

private:
  // NOT TO BE IMPLEMENTED
  NS_ConvertUTF8toUTF16(char16_t) = delete;
};


#ifdef MOZ_USE_CHAR16_WRAPPER

inline char16_t*
wwc(wchar_t* aStr)
{
  return reinterpret_cast<char16_t*>(aStr);
}

inline wchar_t*
wwc(char16_t* aStr)
{
  return reinterpret_cast<wchar_t*>(aStr);
}

inline const char16_t*
wwc(const wchar_t* aStr)
{
  return reinterpret_cast<const char16_t*>(aStr);
}

inline const wchar_t*
wwc(const char16_t* aStr)
{
  return reinterpret_cast<const wchar_t*>(aStr);
}

#else

inline char16_t*
wwc(char16_t* aStr)
{
  return aStr;
}

inline const char16_t*
wwc(const char16_t* aStr)
{
  return aStr;
}

#endif

// the following are included/declared for backwards compatibility
typedef nsAutoString nsVoidableString;

#include "nsDependentString.h"
#include "nsLiteralString.h"
#include "nsPromiseFlatString.h"

// need to include these for backwards compatibility
#include "nsMemory.h"
#include <string.h>
#include <stdio.h>
#include "plhash.h"

#endif // !defined(nsString_h___)