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gecko-dev/xpcom/string/nsTSubstring.h

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/* -*- 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/. */
// IWYU pragma: private, include "nsString.h"
#ifndef nsTSubstring_h
#define nsTSubstring_h
#include "mozilla/Casting.h"
#include "mozilla/IntegerPrintfMacros.h"
#include "mozilla/UniquePtr.h"
#include "mozilla/MemoryReporting.h"
#include "mozilla/IntegerTypeTraits.h"
#include "mozilla/Span.h"
#include "nsTStringRepr.h"
#ifndef MOZILLA_INTERNAL_API
#error "Using XPCOM strings is limited to code linked into libxul."
#endif
template <typename T> class nsTSubstringSplitter;
template <typename T> class nsTString;
/**
* nsTSubstring is an abstract string class. From an API perspective, this
* class is the root of the string class hierarchy. It represents a single
* contiguous array of characters, which may or may not be null-terminated.
* This type is not instantiated directly. A sub-class is instantiated
* instead. For example, see nsTString.
*
* NAMES:
* nsAString for wide characters
* nsACString for narrow characters
*
*/
template <typename T>
class nsTSubstring : public mozilla::detail::nsTStringRepr<T>
{
public:
typedef nsTSubstring<T> self_type;
typedef nsTString<T> string_type;
typedef typename mozilla::detail::nsTStringRepr<T> base_string_type;
typedef typename base_string_type::substring_type substring_type;
typedef typename base_string_type::literalstring_type literalstring_type;
typedef typename base_string_type::fallible_t fallible_t;
typedef typename base_string_type::char_type char_type;
typedef typename base_string_type::char_traits char_traits;
typedef typename base_string_type::incompatible_char_type incompatible_char_type;
typedef typename base_string_type::substring_tuple_type substring_tuple_type;
typedef typename base_string_type::const_iterator const_iterator;
typedef typename base_string_type::iterator iterator;
typedef typename base_string_type::comparator_type comparator_type;
typedef typename base_string_type::char_iterator char_iterator;
typedef typename base_string_type::const_char_iterator const_char_iterator;
typedef typename base_string_type::index_type index_type;
typedef typename base_string_type::size_type size_type;
// These are only for internal use within the string classes:
typedef typename base_string_type::DataFlags DataFlags;
typedef typename base_string_type::ClassFlags ClassFlags;
// this acts like a virtual destructor
~nsTSubstring()
{
Finalize();
}
/**
* writing iterators
*/
char_iterator BeginWriting()
{
if (!EnsureMutable()) {
AllocFailed(base_string_type::mLength);
}
return base_string_type::mData;
}
char_iterator BeginWriting(const fallible_t&)
{
return EnsureMutable() ? base_string_type::mData : char_iterator(0);
}
char_iterator EndWriting()
{
if (!EnsureMutable()) {
AllocFailed(base_string_type::mLength);
}
return base_string_type::mData + base_string_type::mLength;
}
char_iterator EndWriting(const fallible_t&)
{
return EnsureMutable() ? (base_string_type::mData + base_string_type::mLength) : char_iterator(0);
}
char_iterator& BeginWriting(char_iterator& aIter)
{
return aIter = BeginWriting();
}
char_iterator& BeginWriting(char_iterator& aIter, const fallible_t& aFallible)
{
return aIter = BeginWriting(aFallible);
}
char_iterator& EndWriting(char_iterator& aIter)
{
return aIter = EndWriting();
}
char_iterator& EndWriting(char_iterator& aIter, const fallible_t& aFallible)
{
return aIter = EndWriting(aFallible);
}
/**
* Perform string to int conversion.
* @param aErrorCode will contain error if one occurs
* @param aRadix is the radix to use. Only 10 and 16 are supported.
* @return int rep of string value, and possible (out) error code
*/
int32_t ToInteger(nsresult* aErrorCode, uint32_t aRadix = 10) const;
/**
* Perform string to 64-bit int conversion.
* @param aErrorCode will contain error if one occurs
* @param aRadix is the radix to use. Only 10 and 16 are supported.
* @return 64-bit int rep of string value, and possible (out) error code
*/
int64_t ToInteger64(nsresult* aErrorCode, uint32_t aRadix = 10) const;
/**
* deprecated writing iterators
*/
iterator& BeginWriting(iterator& aIter)
{
char_type* data = BeginWriting();
aIter.mStart = data;
aIter.mEnd = data + base_string_type::mLength;
aIter.mPosition = aIter.mStart;
return aIter;
}
iterator& EndWriting(iterator& aIter)
{
char_type* data = BeginWriting();
aIter.mStart = data;
aIter.mEnd = data + base_string_type::mLength;
aIter.mPosition = aIter.mEnd;
return aIter;
}
/**
* assignment
*/
void NS_FASTCALL Assign(char_type aChar);
MOZ_MUST_USE bool NS_FASTCALL Assign(char_type aChar, const fallible_t&);
void NS_FASTCALL Assign(const char_type* aData);
MOZ_MUST_USE bool NS_FASTCALL Assign(const char_type* aData,
const fallible_t&);
void NS_FASTCALL Assign(const char_type* aData, size_type aLength);
MOZ_MUST_USE bool NS_FASTCALL Assign(const char_type* aData,
size_type aLength, const fallible_t&);
void NS_FASTCALL Assign(const self_type&);
MOZ_MUST_USE bool NS_FASTCALL Assign(const self_type&, const fallible_t&);
void NS_FASTCALL Assign(self_type&&);
MOZ_MUST_USE bool NS_FASTCALL Assign(self_type&&, const fallible_t&);
// XXX(nika): GCC 4.9 doesn't correctly resolve calls to Assign a
// nsLiteralCString into a nsTSubstring, due to a frontend bug. This explcit
// Assign overload (and the corresponding constructor and operator= overloads)
// are used to avoid this bug. Once we stop supporting GCC 4.9 we can remove
// them.
void NS_FASTCALL Assign(const literalstring_type&);
void NS_FASTCALL Assign(const substring_tuple_type&);
MOZ_MUST_USE bool NS_FASTCALL Assign(const substring_tuple_type&,
const fallible_t&);
#if defined(MOZ_USE_CHAR16_WRAPPER)
template <typename Q = T, typename EnableIfChar16 = mozilla::Char16OnlyT<Q>>
void Assign(char16ptr_t aData)
{
Assign(static_cast<const char16_t*>(aData));
}
template <typename Q = T, typename EnableIfChar16 = mozilla::Char16OnlyT<Q>>
void Assign(char16ptr_t aData, size_type aLength)
{
Assign(static_cast<const char16_t*>(aData), aLength);
}
template <typename Q = T, typename EnableIfChar16 = mozilla::Char16OnlyT<Q>>
MOZ_MUST_USE bool Assign(char16ptr_t aData, size_type aLength,
const fallible_t& aFallible)
{
return Assign(static_cast<const char16_t*>(aData), aLength,
aFallible);
}
#endif
void NS_FASTCALL AssignASCII(const char* aData, size_type aLength);
MOZ_MUST_USE bool NS_FASTCALL AssignASCII(const char* aData,
size_type aLength,
const fallible_t&);
void NS_FASTCALL AssignASCII(const char* aData)
{
AssignASCII(aData, mozilla::AssertedCast<size_type, size_t>(strlen(aData)));
}
MOZ_MUST_USE bool NS_FASTCALL AssignASCII(const char* aData,
const fallible_t& aFallible)
{
return AssignASCII(aData,
mozilla::AssertedCast<size_type, size_t>(strlen(aData)),
aFallible);
}
// AssignLiteral must ONLY be applied to an actual literal string, or
// a char array *constant* declared without an explicit size.
// Do not attempt to use it with a regular char* pointer, or with a
// non-constant char array variable. Use AssignASCII for those.
// There are not fallible version of these methods because they only really
// apply to small allocations that we wouldn't want to check anyway.
template<int N>
void AssignLiteral(const char_type (&aStr)[N])
{
AssignLiteral(aStr, N - 1);
}
template<int N, typename Q = T, typename EnableIfChar16 = typename mozilla::Char16OnlyT<Q>>
void AssignLiteral(const incompatible_char_type (&aStr)[N])
{
AssignASCII(aStr, N - 1);
}
self_type& operator=(char_type aChar)
{
Assign(aChar);
return *this;
}
self_type& operator=(const char_type* aData)
{
Assign(aData);
return *this;
}
#if defined(MOZ_USE_CHAR16_WRAPPER)
template <typename Q = T, typename EnableIfChar16 = mozilla::Char16OnlyT<Q>>
self_type& operator=(char16ptr_t aData)
{
Assign(aData);
return *this;
}
#endif
self_type& operator=(const self_type& aStr)
{
Assign(aStr);
return *this;
}
self_type& operator=(self_type&& aStr)
{
Assign(mozilla::Move(aStr));
return *this;
}
// NOTE(nika): gcc 4.9 workaround. Remove when support is dropped.
self_type& operator=(const literalstring_type& aStr)
{
Assign(aStr);
return *this;
}
self_type& operator=(const substring_tuple_type& aTuple)
{
Assign(aTuple);
return *this;
}
// Adopt a heap-allocated char sequence for this string; is Voided if aData
// is null. Useful for e.g. converting an strdup'd C string into an
// nsCString. See also getter_Copies(), which is a useful wrapper.
void NS_FASTCALL Adopt(char_type* aData, size_type aLength = size_type(-1));
/**
* buffer manipulation
*/
void NS_FASTCALL Replace(index_type aCutStart, size_type aCutLength,
char_type aChar);
MOZ_MUST_USE bool NS_FASTCALL Replace(index_type aCutStart,
size_type aCutLength,
char_type aChar,
const fallible_t&);
void NS_FASTCALL Replace(index_type aCutStart, size_type aCutLength,
const char_type* aData,
size_type aLength = size_type(-1));
MOZ_MUST_USE bool NS_FASTCALL Replace(index_type aCutStart,
size_type aCutLength,
const char_type* aData,
size_type aLength,
const fallible_t&);
void Replace(index_type aCutStart, size_type aCutLength,
const self_type& aStr)
{
Replace(aCutStart, aCutLength, aStr.Data(), aStr.Length());
}
MOZ_MUST_USE bool Replace(index_type aCutStart,
size_type aCutLength,
const self_type& aStr,
const fallible_t& aFallible)
{
return Replace(aCutStart, aCutLength, aStr.Data(), aStr.Length(),
aFallible);
}
void NS_FASTCALL Replace(index_type aCutStart, size_type aCutLength,
const substring_tuple_type& aTuple);
void NS_FASTCALL ReplaceASCII(index_type aCutStart, size_type aCutLength,
const char* aData,
size_type aLength = size_type(-1));
MOZ_MUST_USE bool NS_FASTCALL ReplaceASCII(index_type aCutStart, size_type aCutLength,
const char* aData,
size_type aLength,
const fallible_t&);
// ReplaceLiteral must ONLY be applied to an actual literal string.
// Do not attempt to use it with a regular char* pointer, or with a char
// array variable. Use Replace or ReplaceASCII for those.
template<int N>
void ReplaceLiteral(index_type aCutStart, size_type aCutLength,
const char_type (&aStr)[N])
{
ReplaceLiteral(aCutStart, aCutLength, aStr, N - 1);
}
void Append(char_type aChar)
{
Replace(base_string_type::mLength, 0, aChar);
}
MOZ_MUST_USE bool Append(char_type aChar, const fallible_t& aFallible)
{
return Replace(base_string_type::mLength, 0, aChar, aFallible);
}
void Append(const char_type* aData, size_type aLength = size_type(-1))
{
Replace(base_string_type::mLength, 0, aData, aLength);
}
MOZ_MUST_USE bool Append(const char_type* aData, size_type aLength,
const fallible_t& aFallible)
{
return Replace(base_string_type::mLength, 0, aData, aLength, aFallible);
}
#if defined(MOZ_USE_CHAR16_WRAPPER)
template <typename Q = T, typename EnableIfChar16 = mozilla::Char16OnlyT<Q>>
void Append(char16ptr_t aData, size_type aLength = size_type(-1))
{
Append(static_cast<const char16_t*>(aData), aLength);
}
#endif
void Append(const self_type& aStr)
{
Replace(base_string_type::mLength, 0, aStr);
}
MOZ_MUST_USE bool Append(const self_type& aStr, const fallible_t& aFallible)
{
return Replace(base_string_type::mLength, 0, aStr, aFallible);
}
void Append(const substring_tuple_type& aTuple)
{
Replace(base_string_type::mLength, 0, aTuple);
}
void AppendASCII(const char* aData, size_type aLength = size_type(-1))
{
ReplaceASCII(base_string_type::mLength, 0, aData, aLength);
}
MOZ_MUST_USE bool AppendASCII(const char* aData, const fallible_t& aFallible)
{
return ReplaceASCII(base_string_type::mLength, 0, aData, size_type(-1), aFallible);
}
MOZ_MUST_USE bool AppendASCII(const char* aData, size_type aLength, const fallible_t& aFallible)
{
return ReplaceASCII(base_string_type::mLength, 0, aData, aLength, aFallible);
}
/**
* Append a formatted string to the current string. Uses the
* standard printf format codes. This uses NSPR formatting, which will be
* locale-aware for floating-point values. You probably don't want to use
* this with floating-point values as a result.
*/
void AppendPrintf(const char* aFormat, ...) MOZ_FORMAT_PRINTF(2, 3);
void AppendPrintf(const char* aFormat, va_list aAp) MOZ_FORMAT_PRINTF(2, 0);
void AppendInt(int32_t aInteger)
{
AppendPrintf("%" PRId32, aInteger);
}
void AppendInt(int32_t aInteger, int aRadix)
{
if (aRadix == 10) {
AppendPrintf("%" PRId32, aInteger);
} else {
AppendPrintf(aRadix == 8 ? "%" PRIo32 : "%" PRIx32,
static_cast<uint32_t>(aInteger));
}
}
void AppendInt(uint32_t aInteger)
{
AppendPrintf("%" PRIu32, aInteger);
}
void AppendInt(uint32_t aInteger, int aRadix)
{
AppendPrintf(aRadix == 10 ? "%" PRIu32 : aRadix == 8 ? "%" PRIo32 : "%" PRIx32,
aInteger);
}
void AppendInt(int64_t aInteger)
{
AppendPrintf("%" PRId64, aInteger);
}
void AppendInt(int64_t aInteger, int aRadix)
{
if (aRadix == 10) {
AppendPrintf("%" PRId64, aInteger);
} else {
AppendPrintf(aRadix == 8 ? "%" PRIo64 : "%" PRIx64,
static_cast<uint64_t>(aInteger));
}
}
void AppendInt(uint64_t aInteger)
{
AppendPrintf("%" PRIu64, aInteger);
}
void AppendInt(uint64_t aInteger, int aRadix)
{
AppendPrintf(aRadix == 10 ? "%" PRIu64 : aRadix == 8 ? "%" PRIo64 : "%" PRIx64,
aInteger);
}
/**
* Append the given float to this string
*/
void NS_FASTCALL AppendFloat(float aFloat);
void NS_FASTCALL AppendFloat(double aFloat);
public:
// AppendLiteral must ONLY be applied to an actual literal string.
// Do not attempt to use it with a regular char* pointer, or with a char
// array variable. Use Append or AppendASCII for those.
template<int N>
void AppendLiteral(const char_type (&aStr)[N])
{
ReplaceLiteral(base_string_type::mLength, 0, aStr, N - 1);
}
// Only enable for T = char16_t
template <int N, typename Q = T, typename EnableIfChar16 = mozilla::Char16OnlyT<Q>>
void AppendLiteral(const incompatible_char_type (&aStr)[N])
{
AppendASCII(aStr, N - 1);
}
// Only enable for T = char16_t
template <int N, typename Q = T, typename EnableIfChar16 = mozilla::Char16OnlyT<Q>>
MOZ_MUST_USE bool
AppendLiteral(const incompatible_char_type (&aStr)[N], const fallible_t& aFallible)
{
return AppendASCII(aStr, N - 1, aFallible);
}
self_type& operator+=(char_type aChar)
{
Append(aChar);
return *this;
}
self_type& operator+=(const char_type* aData)
{
Append(aData);
return *this;
}
#if defined(MOZ_USE_CHAR16_WRAPPER)
template <typename Q = T, typename EnableIfChar16 = mozilla::Char16OnlyT<Q>>
self_type& operator+=(char16ptr_t aData)
{
Append(aData);
return *this;
}
#endif
self_type& operator+=(const self_type& aStr)
{
Append(aStr);
return *this;
}
self_type& operator+=(const substring_tuple_type& aTuple)
{
Append(aTuple);
return *this;
}
void Insert(char_type aChar, index_type aPos)
{
Replace(aPos, 0, aChar);
}
void Insert(const char_type* aData, index_type aPos,
size_type aLength = size_type(-1))
{
Replace(aPos, 0, aData, aLength);
}
#if defined(MOZ_USE_CHAR16_WRAPPER)
template <typename Q = T, typename EnableIfChar16 = mozilla::Char16OnlyT<Q>>
void Insert(char16ptr_t aData, index_type aPos,
size_type aLength = size_type(-1))
{
Insert(static_cast<const char16_t*>(aData), aPos, aLength);
}
#endif
void Insert(const self_type& aStr, index_type aPos)
{
Replace(aPos, 0, aStr);
}
void Insert(const substring_tuple_type& aTuple, index_type aPos)
{
Replace(aPos, 0, aTuple);
}
// InsertLiteral must ONLY be applied to an actual literal string.
// Do not attempt to use it with a regular char* pointer, or with a char
// array variable. Use Insert for those.
template<int N>
void InsertLiteral(const char_type (&aStr)[N], index_type aPos)
{
ReplaceLiteral(aPos, 0, aStr, N - 1);
}
void Cut(index_type aCutStart, size_type aCutLength)
{
Replace(aCutStart, aCutLength, char_traits::sEmptyBuffer, 0);
}
nsTSubstringSplitter<T> Split(const char_type aChar) const;
/**
* buffer sizing
*/
/**
* Attempts to set the capacity to the given size in number of
* characters, without affecting the length of the string.
* There is no need to include room for the null terminator: it is
* the job of the string class.
* Also ensures that the buffer is mutable.
*/
void NS_FASTCALL SetCapacity(size_type aNewCapacity);
MOZ_MUST_USE bool NS_FASTCALL SetCapacity(size_type aNewCapacity,
const fallible_t&);
void NS_FASTCALL SetLength(size_type aNewLength);
MOZ_MUST_USE bool NS_FASTCALL SetLength(size_type aNewLength,
const fallible_t&);
void Truncate(size_type aNewLength = 0)
{
NS_ASSERTION(aNewLength <= base_string_type::mLength, "Truncate cannot make string longer");
SetLength(aNewLength);
}
/**
* buffer access
*/
/**
* Get a const pointer to the string's internal buffer. The caller
* MUST NOT modify the characters at the returned address.
*
* @returns The length of the buffer in characters.
*/
inline size_type GetData(const char_type** aData) const
{
*aData = base_string_type::mData;
return base_string_type::mLength;
}
/**
* Get a pointer to the string's internal buffer, optionally resizing
* the buffer first. If size_type(-1) is passed for newLen, then the
* current length of the string is used. The caller MAY modify the
* characters at the returned address (up to but not exceeding the
* length of the string).
*
* @returns The length of the buffer in characters or 0 if unable to
* satisfy the request due to low-memory conditions.
*/
size_type GetMutableData(char_type** aData, size_type aNewLen = size_type(-1))
{
if (!EnsureMutable(aNewLen)) {
AllocFailed(aNewLen == size_type(-1) ? base_string_type::mLength : aNewLen);
}
*aData = base_string_type::mData;
return base_string_type::mLength;
}
size_type GetMutableData(char_type** aData, size_type aNewLen, const fallible_t&)
{
if (!EnsureMutable(aNewLen)) {
*aData = nullptr;
return 0;
}
*aData = base_string_type::mData;
return base_string_type::mLength;
}
#if defined(MOZ_USE_CHAR16_WRAPPER)
template <typename Q = T, typename EnableIfChar16 = mozilla::Char16OnlyT<Q>>
size_type GetMutableData(wchar_t** aData, size_type aNewLen = size_type(-1))
{
return GetMutableData(reinterpret_cast<char16_t**>(aData), aNewLen);
}
template <typename Q = T, typename EnableIfChar16 = mozilla::Char16OnlyT<Q>>
size_type GetMutableData(wchar_t** aData, size_type aNewLen,
const fallible_t& aFallible)
{
return GetMutableData(reinterpret_cast<char16_t**>(aData), aNewLen,
aFallible);
}
#endif
/**
* Span integration
*/
operator mozilla::Span<char_type>()
{
return mozilla::MakeSpan(BeginWriting(), base_string_type::Length());
}
operator mozilla::Span<const char_type>() const
{
return mozilla::MakeSpan(base_string_type::BeginReading(), base_string_type::Length());
}
void Append(mozilla::Span<const char_type> aSpan)
{
auto len = aSpan.Length();
MOZ_RELEASE_ASSERT(len <= mozilla::MaxValue<size_type>::value);
Append(aSpan.Elements(), len);
}
MOZ_MUST_USE bool Append(mozilla::Span<const char_type> aSpan,
const fallible_t& aFallible)
{
auto len = aSpan.Length();
if (len > mozilla::MaxValue<size_type>::value) {
return false;
}
return Append(aSpan.Elements(), len, aFallible);
}
template <typename Q = T, typename EnableIfChar = mozilla::CharOnlyT<Q>>
operator mozilla::Span<uint8_t>()
{
return mozilla::MakeSpan(reinterpret_cast<uint8_t*>(BeginWriting()),
base_string_type::Length());
}
template <typename Q = T, typename EnableIfChar = mozilla::CharOnlyT<Q>>
operator mozilla::Span<const uint8_t>() const
{
return mozilla::MakeSpan(reinterpret_cast<const uint8_t*>(base_string_type::BeginReading()),
base_string_type::Length());
}
template <typename Q = T, typename EnableIfChar = mozilla::CharOnlyT<Q>>
void Append(mozilla::Span<const uint8_t> aSpan)
{
auto len = aSpan.Length();
MOZ_RELEASE_ASSERT(len <= mozilla::MaxValue<size_type>::value);
Append(reinterpret_cast<const char*>(aSpan.Elements()), len);
}
template <typename Q = T, typename EnableIfChar = mozilla::CharOnlyT<Q>>
MOZ_MUST_USE bool Append(mozilla::Span<const uint8_t> aSpan,
const fallible_t& aFallible)
{
auto len = aSpan.Length();
if (len > mozilla::MaxValue<size_type>::value) {
return false;
}
return Append(
reinterpret_cast<const char*>(aSpan.Elements()), len, aFallible);
}
/**
* string data is never null, but can be marked void. if true, the
* string will be truncated. @see nsTSubstring::IsVoid
*/
void NS_FASTCALL SetIsVoid(bool);
/**
* This method is used to remove all occurrences of aChar from this
* string.
*
* @param aChar -- char to be stripped
*/
void StripChar(char_type aChar);
/**
* This method is used to remove all occurrences of aChars from this
* string.
*
* @param aChars -- chars to be stripped
*/
void StripChars(const char_type* aChars);
/**
* This method is used to remove all occurrences of some characters this
* from this string. The characters removed have the corresponding
* entries in the bool array set to true; we retain all characters
* with code beyond 127.
* THE CALLER IS RESPONSIBLE for making sure the complete boolean
* array, 128 entries, is properly initialized.
*
* See also: ASCIIMask class.
*
* @param aToStrip -- Array where each entry is true if the
* corresponding ASCII character is to be stripped. All
* characters beyond code 127 are retained. Note that this
* parameter is of ASCIIMaskArray type, but we expand the typedef
* to avoid having to include nsASCIIMask.h in this include file
* as it brings other includes.
*/
void StripTaggedASCII(const std::array<bool, 128>& aToStrip);
/**
* A shortcut to strip \r and \n.
*/
void StripCRLF();
/**
* If the string uses a shared buffer, this method
* clears the pointer without releasing the buffer.
*/
void ForgetSharedBuffer()
{
if (base_string_type::mDataFlags & DataFlags::REFCOUNTED) {
SetToEmptyBuffer();
}
}
protected:
void AssertValid()
{
MOZ_ASSERT(!(this->mClassFlags & ClassFlags::NULL_TERMINATED) ||
(this->mDataFlags & DataFlags::TERMINATED),
"String classes whose static type guarantees a null-terminated "
"buffer must not be assigned a non-null-terminated buffer.");
}
public:
/**
* this is public to support automatic conversion of tuple to string
* base type, which helps avoid converting to nsTAString.
*/
MOZ_IMPLICIT nsTSubstring(const substring_tuple_type& aTuple)
: base_string_type(nullptr, 0, DataFlags(0), ClassFlags(0))
{
AssertValid();
Assign(aTuple);
}
size_t SizeOfExcludingThisIfUnshared(mozilla::MallocSizeOf aMallocSizeOf)
const;
size_t SizeOfIncludingThisIfUnshared(mozilla::MallocSizeOf aMallocSizeOf)
const;
/**
* WARNING: Only use these functions if you really know what you are
* doing, because they can easily lead to double-counting strings. If
* you do use them, please explain clearly in a comment why it's safe
* and won't lead to double-counting.
*/
size_t SizeOfExcludingThisEvenIfShared(mozilla::MallocSizeOf aMallocSizeOf)
const;
size_t SizeOfIncludingThisEvenIfShared(mozilla::MallocSizeOf aMallocSizeOf)
const;
template<class N>
void NS_ABORT_OOM(T)
{
struct never {}; // a compiler-friendly way to do static_assert(false)
static_assert(mozilla::IsSame<N, never>::value,
"In string classes, use AllocFailed to account for sizeof(char_type). "
"Use the global ::NS_ABORT_OOM if you really have a count of bytes.");
}
MOZ_ALWAYS_INLINE void AllocFailed(size_t aLength)
{
::NS_ABORT_OOM(aLength * sizeof(char_type));
}
protected:
// default initialization
nsTSubstring()
: base_string_type(char_traits::sEmptyBuffer, 0, DataFlags::TERMINATED,
ClassFlags(0))
{
AssertValid();
}
// copy-constructor, constructs as dependent on given object
// (NOTE: this is for internal use only)
nsTSubstring(const self_type& aStr)
: base_string_type(aStr.base_string_type::mData, aStr.base_string_type::mLength,
aStr.base_string_type::mDataFlags & (DataFlags::TERMINATED | DataFlags::VOIDED),
ClassFlags(0))
{
AssertValid();
}
// initialization with ClassFlags
explicit nsTSubstring(ClassFlags aClassFlags)
: base_string_type(char_traits::sEmptyBuffer, 0, DataFlags::TERMINATED,
aClassFlags)
{
AssertValid();
}
/**
* allows for direct initialization of a nsTSubstring object.
*/
nsTSubstring(char_type* aData, size_type aLength,
DataFlags aDataFlags, ClassFlags aClassFlags)
// XXXbz or can I just include nscore.h and use NS_BUILD_REFCNT_LOGGING?
#if defined(DEBUG) || defined(FORCE_BUILD_REFCNT_LOGGING)
#define XPCOM_STRING_CONSTRUCTOR_OUT_OF_LINE
;
#else
#undef XPCOM_STRING_CONSTRUCTOR_OUT_OF_LINE
: base_string_type(aData, aLength, aDataFlags, aClassFlags)
{
AssertValid();
MOZ_RELEASE_ASSERT(CheckCapacity(aLength), "String is too large.");
}
#endif /* DEBUG || FORCE_BUILD_REFCNT_LOGGING */
void SetToEmptyBuffer()
{
base_string_type::mData = char_traits::sEmptyBuffer;
base_string_type::mLength = 0;
base_string_type::mDataFlags = DataFlags::TERMINATED;
AssertValid();
}
void SetData(char_type* aData, size_type aLength, DataFlags aDataFlags)
{
base_string_type::mData = aData;
base_string_type::mLength = aLength;
base_string_type::mDataFlags = aDataFlags;
AssertValid();
}
/**
* this function releases mData and does not change the value of
* any of its member variables. in other words, this function acts
* like a destructor.
*/
void NS_FASTCALL Finalize();
/**
* this function prepares mData to be mutated.
*
* @param aCapacity specifies the required capacity of mData
* @param aOldData returns null or the old value of mData
* @param aOldFlags returns 0 or the old value of mDataFlags
*
* if mData is already mutable and of sufficient capacity, then this
* function will return immediately. otherwise, it will either resize
* mData or allocate a new shared buffer. if it needs to allocate a
* new buffer, then it will return the old buffer and the corresponding
* flags. this allows the caller to decide when to free the old data.
*
* this function returns false if is unable to allocate sufficient
* memory.
*
* XXX we should expose a way for subclasses to free old_data.
*/
bool NS_FASTCALL MutatePrep(size_type aCapacity,
char_type** aOldData, DataFlags* aOldDataFlags);
/**
* this function prepares a section of mData to be modified. if
* necessary, this function will reallocate mData and possibly move
* existing data to open up the specified section.
*
* @param aCutStart specifies the starting offset of the section
* @param aCutLength specifies the length of the section to be replaced
* @param aNewLength specifies the length of the new section
*
* for example, suppose mData contains the string "abcdef" then
*
* ReplacePrep(2, 3, 4);
*
* would cause mData to look like "ab____f" where the characters
* indicated by '_' have an unspecified value and can be freely
* modified. this function will null-terminate mData upon return.
*
* this function returns false if is unable to allocate sufficient
* memory.
*/
MOZ_MUST_USE bool ReplacePrep(index_type aCutStart,
size_type aCutLength,
size_type aNewLength);
MOZ_MUST_USE bool NS_FASTCALL ReplacePrepInternal(
index_type aCutStart,
size_type aCutLength,
size_type aNewFragLength,
size_type aNewTotalLength);
/**
* returns the number of writable storage units starting at mData.
* the value does not include space for the null-terminator character.
*
* NOTE: this function returns 0 if mData is immutable (or the buffer
* is 0-sized).
*/
size_type NS_FASTCALL Capacity() const;
/**
* this helper function can be called prior to directly manipulating
* the contents of mData. see, for example, BeginWriting.
*/
MOZ_MUST_USE bool NS_FASTCALL EnsureMutable(
size_type aNewLen = size_type(-1));
/**
* Checks if the given capacity is valid for this string type.
*/
static MOZ_MUST_USE bool CheckCapacity(size_type aCapacity) {
if (aCapacity > kMaxCapacity) {
// Also assert for |aCapacity| equal to |size_type(-1)|, since we used to
// use that value to flag immutability.
NS_ASSERTION(aCapacity != size_type(-1), "Bogus capacity");
return false;
}
return true;
}
void NS_FASTCALL ReplaceLiteral(index_type aCutStart, size_type aCutLength,
const char_type* aData, size_type aLength);
static const size_type kMaxCapacity;
public:
// NOTE: this method is declared public _only_ for convenience for
// callers who don't have access to the original nsLiteralString_CharT.
void NS_FASTCALL AssignLiteral(const char_type* aData, size_type aLength);
};
extern template class nsTSubstring<char>;
extern template class nsTSubstring<char16_t>;
static_assert(sizeof(nsTSubstring<char>) ==
sizeof(mozilla::detail::nsTStringRepr<char>),
"Don't add new data fields to nsTSubstring_CharT. "
"Add to nsTStringRepr<T> instead.");
// You should not need to instantiate this class directly.
// Use nsTSubstring::Split instead.
template <typename T>
class nsTSubstringSplitter
{
typedef typename nsTSubstring<T>::size_type size_type;
typedef typename nsTSubstring<T>::char_type char_type;
class nsTSubstringSplit_Iter
{
public:
nsTSubstringSplit_Iter(const nsTSubstringSplitter<T>& aObj,
size_type aPos)
: mObj(aObj)
, mPos(aPos)
{
}
bool operator!=(const nsTSubstringSplit_Iter& other) const
{
return mPos != other.mPos;
}
const nsTDependentSubstring<T>& operator*() const;
const nsTSubstringSplit_Iter& operator++()
{
++mPos;
return *this;
}
private:
const nsTSubstringSplitter<T>& mObj;
size_type mPos;
};
private:
const nsTSubstring<T>* const mStr;
mozilla::UniquePtr<nsTDependentSubstring<T>[]> mArray;
size_type mArraySize;
const char_type mDelim;
public:
nsTSubstringSplitter(const nsTSubstring<T>* aStr, char_type aDelim);
nsTSubstringSplit_Iter begin() const
{
return nsTSubstringSplit_Iter(*this, 0);
}
nsTSubstringSplit_Iter end() const
{
return nsTSubstringSplit_Iter(*this, mArraySize);
}
const nsTDependentSubstring<T>& Get(const size_type index) const
{
MOZ_ASSERT(index < mArraySize);
return mArray[index];
}
};
extern template class nsTSubstringSplitter<char>;
extern template class nsTSubstringSplitter<char16_t>;
/**
* Span integration
*/
namespace mozilla {
inline Span<char>
MakeSpan(nsTSubstring<char>& aString)
{
return aString;
}
inline Span<const char>
MakeSpan(const nsTSubstring<char>& aString)
{
return aString;
}
inline Span<char16_t>
MakeSpan(nsTSubstring<char16_t>& aString)
{
return aString;
}
inline Span<const char16_t>
MakeSpan(const nsTSubstring<char16_t>& aString)
{
return aString;
}
} // namespace mozilla
#endif
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