xpcom/string/nsString.h
author Eric Rahm <erahm@mozilla.com>
Mon, 14 Aug 2017 14:22:50 -0700
changeset 428973 8b18f545fd6f7dd341010b041bd248a1e726bc13
parent 412542 a9f6111bc6d0abfa5199a7e8d3549bfed8ff29ba
child 429045 7e21f710ecec4a16f1f23e7489bbb0eb3e45e462
permissions -rw-r--r--
Bug 1393230 - Part 3: Convert the xpcom string classes to be templated on char type. r=njn, r=fitzgen, r=sfink This removes the double-include macro hackery that we use to define two separate string types (nsAString and nsACString) in favor of a templated solution. Annotations for Valgrind and the JS hazard analysis are updated as well as the rust binding generations for string code.

/* -*- 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 "nsStringFwd.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

#include "nsTString.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");

static_assert(sizeof(nsTLiteralString<char>) == sizeof(nsTString<char>),
              "nsLiteralCString can masquerade as nsCString, "
              "so they must have identical layout");

static_assert(sizeof(nsTLiteralString<char16_t>) == sizeof(nsTString<char16_t>),
              "nsTLiteralString can masquerade as nsString, "
              "so they must have identical layout");


/**
 * 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(static_cast<const char16_t*>(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(static_cast<const char16_t*>(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;
};

// 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___)