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/*
* Copyright (C) 1999 Lars Knoll (knoll@kde.org)
* Copyright (C) 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
* Copyright (C) 2009 Google Inc. All rights reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*
*/
#ifndef StringImpl_h
#define StringImpl_h
#include <limits.h>
#include <wtf/ASCIICType.h>
#include <wtf/CrossThreadRefCounted.h>
#include <wtf/Noncopyable.h>
#include <wtf/OwnFastMallocPtr.h>
#include <wtf/RefCounted.h>
#include <wtf/StringHashFunctions.h>
#include <wtf/Vector.h>
#include <wtf/unicode/Unicode.h>
#if PLATFORM(CF)
typedef const struct __CFString * CFStringRef;
#endif
#ifdef __OBJC__
@class NSString;
#endif
namespace JSC {
class UString;
}
namespace WebCore {
class StringBuffer;
struct CStringTranslator;
struct HashAndCharactersTranslator;
struct StringHash;
struct UCharBufferTranslator;
enum TextCaseSensitivity { TextCaseSensitive, TextCaseInsensitive };
typedef bool (*CharacterMatchFunctionPtr)(UChar);
class StringImpl : public Noncopyable {
friend struct CStringTranslator;
friend struct HashAndCharactersTranslator;
friend struct UCharBufferTranslator;
private:
friend class ThreadGlobalData;
enum BufferOwnership {
BufferInternal,
BufferOwned,
BufferShared,
};
typedef CrossThreadRefCounted<OwnFastMallocPtr<UChar> > SharedUChar;
// Used to create the empty string (""), automatically hashes.
StringImpl();
// Create a StringImpl with internal storage (BufferInternal)
StringImpl(unsigned length);
// Create a StringImpl adopting ownership of the provided buffer (BufferOwned)
StringImpl(const UChar*, unsigned length);
// Create a StringImpl using a shared buffer (BufferShared)
StringImpl(const UChar*, unsigned length, PassRefPtr<SharedUChar>);
// For use only by AtomicString's XXXTranslator helpers.
void setHash(unsigned hash) { ASSERT(!m_hash); m_hash = hash; }
public:
~StringImpl();
static PassRefPtr<StringImpl> create(const UChar*, unsigned length);
static PassRefPtr<StringImpl> create(const char*, unsigned length);
static PassRefPtr<StringImpl> create(const char*);
static PassRefPtr<StringImpl> createUninitialized(unsigned length, UChar*& data);
static PassRefPtr<StringImpl> createWithTerminatingNullCharacter(const StringImpl&);
static PassRefPtr<StringImpl> createStrippingNullCharacters(const UChar*, unsigned length);
static PassRefPtr<StringImpl> adopt(StringBuffer&);
static PassRefPtr<StringImpl> adopt(Vector<UChar>&);
#if USE(JSC)
static PassRefPtr<StringImpl> create(const JSC::UString&);
JSC::UString ustring();
#endif
SharedUChar* sharedBuffer();
const UChar* characters() { return m_data; }
unsigned length() { return m_length; }
bool hasTerminatingNullCharacter() const { return m_refCountAndFlags & s_refCountFlagHasTerminatingNullCharacter; }
bool inTable() const { return m_refCountAndFlags & s_refCountFlagInTable; }
void setInTable() { m_refCountAndFlags |= s_refCountFlagInTable; }
unsigned hash() { if (m_hash == 0) m_hash = computeHash(m_data, m_length); return m_hash; }
unsigned existingHash() const { ASSERT(m_hash); return m_hash; }
inline static unsigned computeHash(const UChar* data, unsigned length) { return WTF::stringHash(data, length); }
inline static unsigned computeHash(const char* data) { return WTF::stringHash(data); }
StringImpl* ref() { m_refCountAndFlags += s_refCountIncrement; return this; }
ALWAYS_INLINE void deref() { m_refCountAndFlags -= s_refCountIncrement; if (!(m_refCountAndFlags & s_refCountMask)) delete this; }
ALWAYS_INLINE bool hasOneRef() const { return (m_refCountAndFlags & s_refCountMask) == s_refCountIncrement; }
// Returns a StringImpl suitable for use on another thread.
PassRefPtr<StringImpl> crossThreadString();
// Makes a deep copy. Helpful only if you need to use a String on another thread
// (use crossThreadString if the method call doesn't need to be threadsafe).
// Since StringImpl objects are immutable, there's no other reason to make a copy.
PassRefPtr<StringImpl> threadsafeCopy() const;
PassRefPtr<StringImpl> substring(unsigned pos, unsigned len = UINT_MAX);
UChar operator[](unsigned i) { ASSERT(i < m_length); return m_data[i]; }
UChar32 characterStartingAt(unsigned);
bool containsOnlyWhitespace();
int toIntStrict(bool* ok = 0, int base = 10);
unsigned toUIntStrict(bool* ok = 0, int base = 10);
int64_t toInt64Strict(bool* ok = 0, int base = 10);
uint64_t toUInt64Strict(bool* ok = 0, int base = 10);
intptr_t toIntPtrStrict(bool* ok = 0, int base = 10);
int toInt(bool* ok = 0); // ignores trailing garbage
unsigned toUInt(bool* ok = 0); // ignores trailing garbage
int64_t toInt64(bool* ok = 0); // ignores trailing garbage
uint64_t toUInt64(bool* ok = 0); // ignores trailing garbage
intptr_t toIntPtr(bool* ok = 0); // ignores trailing garbage
double toDouble(bool* ok = 0);
float toFloat(bool* ok = 0);
PassRefPtr<StringImpl> lower();
PassRefPtr<StringImpl> upper();
PassRefPtr<StringImpl> secure(UChar aChar);
PassRefPtr<StringImpl> capitalize(UChar previousCharacter);
PassRefPtr<StringImpl> foldCase();
PassRefPtr<StringImpl> stripWhiteSpace();
PassRefPtr<StringImpl> simplifyWhiteSpace();
PassRefPtr<StringImpl> removeCharacters(CharacterMatchFunctionPtr);
int find(const char*, int index = 0, bool caseSensitive = true);
int find(UChar, int index = 0);
int find(CharacterMatchFunctionPtr, int index = 0);
int find(StringImpl*, int index, bool caseSensitive = true);
int reverseFind(UChar, int index);
int reverseFind(StringImpl*, int index, bool caseSensitive = true);
bool startsWith(StringImpl* str, bool caseSensitive = true) { return reverseFind(str, 0, caseSensitive) == 0; }
bool endsWith(StringImpl*, bool caseSensitive = true);
PassRefPtr<StringImpl> replace(UChar, UChar);
PassRefPtr<StringImpl> replace(UChar, StringImpl*);
PassRefPtr<StringImpl> replace(StringImpl*, StringImpl*);
PassRefPtr<StringImpl> replace(unsigned index, unsigned len, StringImpl*);
static StringImpl* empty();
Vector<char> ascii();
WTF::Unicode::Direction defaultWritingDirection();
#if PLATFORM(CF)
CFStringRef createCFString();
#endif
#ifdef __OBJC__
operator NSString*();
#endif
private:
using Noncopyable::operator new;
void* operator new(size_t, void* inPlace) { ASSERT(inPlace); return inPlace; }
static PassRefPtr<StringImpl> createStrippingNullCharactersSlowCase(const UChar*, unsigned length);
// The StringImpl struct and its data may be allocated within a single heap block.
// In this case, the m_data pointer is an "internal buffer", and does not need to be deallocated.
BufferOwnership bufferOwnership() const { return static_cast<BufferOwnership>(m_refCountAndFlags & s_refCountMaskBufferOwnership); }
static const unsigned s_refCountMask = 0xFFFFFFF0;
static const unsigned s_refCountIncrement = 0x10;
static const unsigned s_refCountFlagHasTerminatingNullCharacter = 0x8;
static const unsigned s_refCountFlagInTable = 0x4;
static const unsigned s_refCountMaskBufferOwnership = 0x3;
const UChar* m_data;
SharedUChar* m_sharedBuffer;
unsigned m_length;
unsigned m_refCountAndFlags;
mutable unsigned m_hash;
};
bool equal(StringImpl*, StringImpl*);
bool equal(StringImpl*, const char*);
inline bool equal(const char* a, StringImpl* b) { return equal(b, a); }
bool equalIgnoringCase(StringImpl*, StringImpl*);
bool equalIgnoringCase(StringImpl*, const char*);
inline bool equalIgnoringCase(const char* a, StringImpl* b) { return equalIgnoringCase(b, a); }
bool equalIgnoringCase(const UChar* a, const char* b, unsigned length);
inline bool equalIgnoringCase(const char* a, const UChar* b, unsigned length) { return equalIgnoringCase(b, a, length); }
bool equalIgnoringNullity(StringImpl*, StringImpl*);
static inline bool isSpaceOrNewline(UChar c)
{
// Use isASCIISpace() for basic Latin-1.
// This will include newlines, which aren't included in Unicode DirWS.
return c <= 0x7F ? WTF::isASCIISpace(c) : WTF::Unicode::direction(c) == WTF::Unicode::WhiteSpaceNeutral;
}
// This is a hot function because it's used when parsing HTML.
inline PassRefPtr<StringImpl> StringImpl::createStrippingNullCharacters(const UChar* characters, unsigned length)
{
ASSERT(characters);
ASSERT(length);
// Optimize for the case where there are no Null characters by quickly
// searching for nulls, and then using StringImpl::create, which will
// memcpy the whole buffer. This is faster than assigning character by
// character during the loop.
// Fast case.
int foundNull = 0;
for (unsigned i = 0; !foundNull && i < length; i++) {
int c = characters[i]; // more efficient than using UChar here (at least on Intel Mac OS)
foundNull |= !c;
}
if (!foundNull)
return StringImpl::create(characters, length);
return StringImpl::createStrippingNullCharactersSlowCase(characters, length);
}
}
namespace WTF {
// WebCore::StringHash is the default hash for StringImpl* and RefPtr<StringImpl>
template<typename T> struct DefaultHash;
template<> struct DefaultHash<WebCore::StringImpl*> {
typedef WebCore::StringHash Hash;
};
template<> struct DefaultHash<RefPtr<WebCore::StringImpl> > {
typedef WebCore::StringHash Hash;
};
}
#endif
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