| /* |
| * Copyright (C) 1999 Lars Knoll (knoll@kde.org) |
| * Copyright (C) 2005-2017 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 <unicode/uchar.h> |
| #include <unicode/ustring.h> |
| #include <wtf/ASCIICType.h> |
| #include <wtf/CheckedArithmetic.h> |
| #include <wtf/Forward.h> |
| #include <wtf/Hasher.h> |
| #include <wtf/MathExtras.h> |
| #include <wtf/StdLibExtras.h> |
| #include <wtf/Vector.h> |
| #include <wtf/text/ConversionMode.h> |
| #include <wtf/text/StringCommon.h> |
| |
| #if USE(CF) |
| typedef const struct __CFString * CFStringRef; |
| #endif |
| |
| #ifdef __OBJC__ |
| @class NSString; |
| #endif |
| |
| namespace JSC { |
| namespace LLInt { class Data; } |
| class LLIntOffsetsExtractor; |
| } |
| |
| namespace WTF { |
| |
| class SymbolImpl; |
| class SymbolRegistry; |
| |
| struct CStringTranslator; |
| template<typename> struct BufferFromStaticDataTranslator; |
| struct HashAndUTF8CharactersTranslator; |
| struct LCharBufferTranslator; |
| struct StringHash; |
| struct SubstringTranslator; |
| struct UCharBufferTranslator; |
| |
| template<typename> class RetainPtr; |
| |
| template<typename> struct HashAndCharactersTranslator; |
| |
| enum TextCaseSensitivity { |
| TextCaseSensitive, |
| TextCaseInsensitive |
| }; |
| |
| typedef bool (*CharacterMatchFunctionPtr)(UChar); |
| typedef bool (*IsWhiteSpaceFunctionPtr)(UChar); |
| |
| // Define STRING_STATS to 1 turn on run time statistics of string sizes and memory usage |
| #define STRING_STATS 0 |
| |
| #if STRING_STATS |
| struct StringStats { |
| inline void add8BitString(unsigned length, bool isSubString = false) |
| { |
| ++m_totalNumberStrings; |
| ++m_number8BitStrings; |
| if (!isSubString) |
| m_total8BitData += length; |
| } |
| |
| inline void add16BitString(unsigned length, bool isSubString = false) |
| { |
| ++m_totalNumberStrings; |
| ++m_number16BitStrings; |
| if (!isSubString) |
| m_total16BitData += length; |
| } |
| |
| void removeString(StringImpl&); |
| void printStats(); |
| |
| static const unsigned s_printStringStatsFrequency = 5000; |
| static std::atomic<unsigned> s_stringRemovesTillPrintStats; |
| |
| std::atomic<unsigned> m_refCalls; |
| std::atomic<unsigned> m_derefCalls; |
| |
| std::atomic<unsigned> m_totalNumberStrings; |
| std::atomic<unsigned> m_number8BitStrings; |
| std::atomic<unsigned> m_number16BitStrings; |
| std::atomic<unsigned long long> m_total8BitData; |
| std::atomic<unsigned long long> m_total16BitData; |
| }; |
| |
| #define STRING_STATS_ADD_8BIT_STRING(length) StringImpl::stringStats().add8BitString(length) |
| #define STRING_STATS_ADD_8BIT_STRING2(length, isSubString) StringImpl::stringStats().add8BitString(length, isSubString) |
| #define STRING_STATS_ADD_16BIT_STRING(length) StringImpl::stringStats().add16BitString(length) |
| #define STRING_STATS_ADD_16BIT_STRING2(length, isSubString) StringImpl::stringStats().add16BitString(length, isSubString) |
| #define STRING_STATS_REMOVE_STRING(string) StringImpl::stringStats().removeString(string) |
| #define STRING_STATS_REF_STRING(string) ++StringImpl::stringStats().m_refCalls; |
| #define STRING_STATS_DEREF_STRING(string) ++StringImpl::stringStats().m_derefCalls; |
| #else |
| #define STRING_STATS_ADD_8BIT_STRING(length) ((void)0) |
| #define STRING_STATS_ADD_8BIT_STRING2(length, isSubString) ((void)0) |
| #define STRING_STATS_ADD_16BIT_STRING(length) ((void)0) |
| #define STRING_STATS_ADD_16BIT_STRING2(length, isSubString) ((void)0) |
| #define STRING_STATS_ADD_UPCONVERTED_STRING(length) ((void)0) |
| #define STRING_STATS_REMOVE_STRING(string) ((void)0) |
| #define STRING_STATS_REF_STRING(string) ((void)0) |
| #define STRING_STATS_DEREF_STRING(string) ((void)0) |
| #endif |
| |
| class StringImplShape { |
| WTF_MAKE_NONCOPYABLE(StringImplShape); |
| protected: |
| StringImplShape(unsigned refCount, unsigned length, const LChar* data8, unsigned hashAndFlags) |
| : m_refCount(refCount) |
| , m_length(length) |
| , m_data8(data8) |
| , m_hashAndFlags(hashAndFlags) |
| { } |
| |
| StringImplShape(unsigned refCount, unsigned length, const UChar* data16, unsigned hashAndFlags) |
| : m_refCount(refCount) |
| , m_length(length) |
| , m_data16(data16) |
| , m_hashAndFlags(hashAndFlags) |
| { } |
| |
| enum ConstructWithConstExprTag { ConstructWithConstExpr }; |
| |
| template<unsigned characterCount> |
| constexpr StringImplShape(unsigned refCount, unsigned length, const char (&characters)[characterCount], unsigned hashAndFlags, ConstructWithConstExprTag) |
| : m_refCount(refCount) |
| , m_length(length) |
| , m_data8Char(characters) |
| , m_hashAndFlags(hashAndFlags) |
| { } |
| |
| template<unsigned characterCount> |
| constexpr StringImplShape(unsigned refCount, unsigned length, const char16_t (&characters)[characterCount], unsigned hashAndFlags, ConstructWithConstExprTag) |
| : m_refCount(refCount) |
| , m_length(length) |
| , m_data16Char(characters) |
| , m_hashAndFlags(hashAndFlags) |
| { } |
| |
| unsigned m_refCount; |
| unsigned m_length; |
| union { |
| const LChar* m_data8; |
| const UChar* m_data16; |
| // It seems that reinterpret_cast prevents constexpr's compile time initialization in VC++. |
| // These are needed to avoid reinterpret_cast. |
| const char* m_data8Char; |
| const char16_t* m_data16Char; |
| }; |
| mutable unsigned m_hashAndFlags; |
| }; |
| |
| class StringImpl : private StringImplShape { |
| WTF_MAKE_NONCOPYABLE(StringImpl); WTF_MAKE_FAST_ALLOCATED; |
| friend struct WTF::CStringTranslator; |
| template<typename CharacterType> friend struct WTF::HashAndCharactersTranslator; |
| friend struct WTF::HashAndUTF8CharactersTranslator; |
| template<typename CharacterType> friend struct WTF::BufferFromStaticDataTranslator; |
| friend struct WTF::LCharBufferTranslator; |
| friend struct WTF::SubstringTranslator; |
| friend struct WTF::UCharBufferTranslator; |
| friend class JSC::LLInt::Data; |
| friend class JSC::LLIntOffsetsExtractor; |
| friend class AtomicStringImpl; |
| friend class SymbolImpl; |
| friend class PrivateSymbolImpl; |
| friend class RegisteredSymbolImpl; |
| |
| private: |
| enum BufferOwnership { |
| BufferInternal, |
| BufferOwned, |
| BufferSubstring, |
| }; |
| |
| // The bottom 6 bits in the hash are flags. |
| public: |
| static constexpr const unsigned s_flagCount = 6; |
| private: |
| static constexpr const unsigned s_flagMask = (1u << s_flagCount) - 1; |
| static_assert(s_flagCount <= StringHasher::flagCount, "StringHasher reserves enough bits for StringImpl flags"); |
| static constexpr const unsigned s_flagStringKindCount = 4; |
| |
| static constexpr const unsigned s_hashFlagStringKindIsAtomic = 1u << (s_flagStringKindCount); |
| static constexpr const unsigned s_hashFlagStringKindIsSymbol = 1u << (s_flagStringKindCount + 1); |
| static constexpr const unsigned s_hashMaskStringKind = s_hashFlagStringKindIsAtomic | s_hashFlagStringKindIsSymbol; |
| static constexpr const unsigned s_hashFlag8BitBuffer = 1u << 3; |
| static constexpr const unsigned s_hashFlagDidReportCost = 1u << 2; |
| static constexpr const unsigned s_hashMaskBufferOwnership = (1u << 0) | (1u << 1); |
| |
| enum StringKind { |
| StringNormal = 0u, // non-symbol, non-atomic |
| StringAtomic = s_hashFlagStringKindIsAtomic, // non-symbol, atomic |
| StringSymbol = s_hashFlagStringKindIsSymbol, // symbol, non-atomic |
| }; |
| |
| // FIXME: there has to be a less hacky way to do this. |
| enum Force8Bit { Force8BitConstructor }; |
| // Create a normal 8-bit string with internal storage (BufferInternal) |
| StringImpl(unsigned length, Force8Bit) |
| : StringImplShape(s_refCountIncrement, length, tailPointer<LChar>(), s_hashFlag8BitBuffer | StringNormal | BufferInternal) |
| { |
| ASSERT(m_data8); |
| ASSERT(m_length); |
| |
| STRING_STATS_ADD_8BIT_STRING(m_length); |
| } |
| |
| // Create a normal 16-bit string with internal storage (BufferInternal) |
| StringImpl(unsigned length) |
| : StringImplShape(s_refCountIncrement, length, tailPointer<UChar>(), StringNormal | BufferInternal) |
| { |
| ASSERT(m_data16); |
| ASSERT(m_length); |
| |
| STRING_STATS_ADD_16BIT_STRING(m_length); |
| } |
| |
| // Create a StringImpl adopting ownership of the provided buffer (BufferOwned) |
| StringImpl(MallocPtr<LChar> characters, unsigned length) |
| : StringImplShape(s_refCountIncrement, length, characters.leakPtr(), s_hashFlag8BitBuffer | StringNormal | BufferOwned) |
| { |
| ASSERT(m_data8); |
| ASSERT(m_length); |
| |
| STRING_STATS_ADD_8BIT_STRING(m_length); |
| } |
| |
| enum ConstructWithoutCopyingTag { ConstructWithoutCopying }; |
| StringImpl(const UChar* characters, unsigned length, ConstructWithoutCopyingTag) |
| : StringImplShape(s_refCountIncrement, length, characters, StringNormal | BufferInternal) |
| { |
| ASSERT(m_data16); |
| ASSERT(m_length); |
| |
| STRING_STATS_ADD_16BIT_STRING(m_length); |
| } |
| |
| StringImpl(const LChar* characters, unsigned length, ConstructWithoutCopyingTag) |
| : StringImplShape(s_refCountIncrement, length, characters, s_hashFlag8BitBuffer | StringNormal | BufferInternal) |
| { |
| ASSERT(m_data8); |
| ASSERT(m_length); |
| |
| STRING_STATS_ADD_8BIT_STRING(m_length); |
| } |
| |
| // Create a StringImpl adopting ownership of the provided buffer (BufferOwned) |
| StringImpl(MallocPtr<UChar> characters, unsigned length) |
| : StringImplShape(s_refCountIncrement, length, characters.leakPtr(), StringNormal | BufferOwned) |
| { |
| ASSERT(m_data16); |
| ASSERT(m_length); |
| |
| STRING_STATS_ADD_16BIT_STRING(m_length); |
| } |
| |
| // Used to create new strings that are a substring of an existing 8-bit StringImpl (BufferSubstring) |
| StringImpl(const LChar* characters, unsigned length, Ref<StringImpl>&& base) |
| : StringImplShape(s_refCountIncrement, length, characters, s_hashFlag8BitBuffer | StringNormal | BufferSubstring) |
| { |
| ASSERT(is8Bit()); |
| ASSERT(m_data8); |
| ASSERT(m_length); |
| ASSERT(base->bufferOwnership() != BufferSubstring); |
| |
| substringBuffer() = &base.leakRef(); |
| |
| STRING_STATS_ADD_8BIT_STRING2(m_length, true); |
| } |
| |
| // Used to create new strings that are a substring of an existing 16-bit StringImpl (BufferSubstring) |
| StringImpl(const UChar* characters, unsigned length, Ref<StringImpl>&& base) |
| : StringImplShape(s_refCountIncrement, length, characters, StringNormal | BufferSubstring) |
| { |
| ASSERT(!is8Bit()); |
| ASSERT(m_data16); |
| ASSERT(m_length); |
| ASSERT(base->bufferOwnership() != BufferSubstring); |
| |
| substringBuffer() = &base.leakRef(); |
| |
| STRING_STATS_ADD_16BIT_STRING2(m_length, true); |
| } |
| |
| public: |
| WTF_EXPORT_STRING_API static void destroy(StringImpl*); |
| |
| WTF_EXPORT_STRING_API static Ref<StringImpl> create(const UChar*, unsigned length); |
| WTF_EXPORT_STRING_API static Ref<StringImpl> create(const LChar*, unsigned length); |
| WTF_EXPORT_STRING_API static Ref<StringImpl> create8BitIfPossible(const UChar*, unsigned length); |
| template<size_t inlineCapacity> |
| static Ref<StringImpl> create8BitIfPossible(const Vector<UChar, inlineCapacity>& vector) |
| { |
| return create8BitIfPossible(vector.data(), vector.size()); |
| } |
| WTF_EXPORT_STRING_API static Ref<StringImpl> create8BitIfPossible(const UChar*); |
| |
| ALWAYS_INLINE static Ref<StringImpl> create(const char* s, unsigned length) { return create(reinterpret_cast<const LChar*>(s), length); } |
| WTF_EXPORT_STRING_API static Ref<StringImpl> create(const LChar*); |
| ALWAYS_INLINE static Ref<StringImpl> create(const char* s) { return create(reinterpret_cast<const LChar*>(s)); } |
| |
| static ALWAYS_INLINE Ref<StringImpl> createSubstringSharingImpl(StringImpl& rep, unsigned offset, unsigned length) |
| { |
| ASSERT(length <= rep.length()); |
| |
| if (!length) |
| return *empty(); |
| |
| auto* ownerRep = ((rep.bufferOwnership() == BufferSubstring) ? rep.substringBuffer() : &rep); |
| |
| // We allocate a buffer that contains both the StringImpl struct as well as the pointer to the owner string. |
| auto* stringImpl = static_cast<StringImpl*>(fastMalloc(allocationSize<StringImpl*>(1))); |
| if (rep.is8Bit()) |
| return adoptRef(*new (NotNull, stringImpl) StringImpl(rep.m_data8 + offset, length, *ownerRep)); |
| return adoptRef(*new (NotNull, stringImpl) StringImpl(rep.m_data16 + offset, length, *ownerRep)); |
| } |
| |
| template<unsigned characterCount> |
| ALWAYS_INLINE static Ref<StringImpl> createFromLiteral(const char (&characters)[characterCount]) |
| { |
| COMPILE_ASSERT(characterCount > 1, StringImplFromLiteralNotEmpty); |
| COMPILE_ASSERT((characterCount - 1 <= ((unsigned(~0) - sizeof(StringImpl)) / sizeof(LChar))), StringImplFromLiteralCannotOverflow); |
| |
| return createWithoutCopying(reinterpret_cast<const LChar*>(characters), characterCount - 1); |
| } |
| |
| // FIXME: Transition off of these functions to createWithoutCopying instead. |
| WTF_EXPORT_STRING_API static Ref<StringImpl> createFromLiteral(const char* characters, unsigned length); |
| WTF_EXPORT_STRING_API static Ref<StringImpl> createFromLiteral(const char* characters); |
| |
| WTF_EXPORT_STRING_API static Ref<StringImpl> createWithoutCopying(const UChar* characters, unsigned length); |
| WTF_EXPORT_STRING_API static Ref<StringImpl> createWithoutCopying(const LChar* characters, unsigned length); |
| |
| WTF_EXPORT_STRING_API static Ref<StringImpl> createUninitialized(unsigned length, LChar*& data); |
| WTF_EXPORT_STRING_API static Ref<StringImpl> createUninitialized(unsigned length, UChar*& data); |
| template <typename T> static ALWAYS_INLINE RefPtr<StringImpl> tryCreateUninitialized(unsigned length, T*& output) |
| { |
| if (!length) { |
| output = nullptr; |
| return empty(); |
| } |
| |
| if (length > ((std::numeric_limits<unsigned>::max() - sizeof(StringImpl)) / sizeof(T))) { |
| output = nullptr; |
| return nullptr; |
| } |
| StringImpl* resultImpl; |
| if (!tryFastMalloc(allocationSize<T>(length)).getValue(resultImpl)) { |
| output = nullptr; |
| return nullptr; |
| } |
| output = resultImpl->tailPointer<T>(); |
| |
| return constructInternal<T>(resultImpl, length); |
| } |
| |
| // Reallocate the StringImpl. The originalString must be only owned by the Ref, |
| // and the buffer ownership must be BufferInternal. Just like the input pointer of realloc(), |
| // the originalString can't be used after this function. |
| static Ref<StringImpl> reallocate(Ref<StringImpl>&& originalString, unsigned length, LChar*& data); |
| static Ref<StringImpl> reallocate(Ref<StringImpl>&& originalString, unsigned length, UChar*& data); |
| |
| static unsigned flagsOffset() { return OBJECT_OFFSETOF(StringImpl, m_hashAndFlags); } |
| static unsigned flagIs8Bit() { return s_hashFlag8BitBuffer; } |
| static unsigned flagIsAtomic() { return s_hashFlagStringKindIsAtomic; } |
| static unsigned flagIsSymbol() { return s_hashFlagStringKindIsSymbol; } |
| static unsigned maskStringKind() { return s_hashMaskStringKind; } |
| static unsigned dataOffset() { return OBJECT_OFFSETOF(StringImpl, m_data8); } |
| |
| template<typename CharType, size_t inlineCapacity, typename OverflowHandler> |
| static Ref<StringImpl> adopt(Vector<CharType, inlineCapacity, OverflowHandler>&& vector) |
| { |
| if (size_t size = vector.size()) { |
| ASSERT(vector.data()); |
| if (size > std::numeric_limits<unsigned>::max()) |
| CRASH(); |
| return adoptRef(*new StringImpl(vector.releaseBuffer(), size)); |
| } |
| return *empty(); |
| } |
| |
| WTF_EXPORT_STRING_API static Ref<StringImpl> adopt(StringBuffer<UChar>&&); |
| WTF_EXPORT_STRING_API static Ref<StringImpl> adopt(StringBuffer<LChar>&&); |
| |
| unsigned length() const { return m_length; } |
| static ptrdiff_t lengthMemoryOffset() { return OBJECT_OFFSETOF(StringImpl, m_length); } |
| bool is8Bit() const { return m_hashAndFlags & s_hashFlag8BitBuffer; } |
| |
| ALWAYS_INLINE const LChar* characters8() const { ASSERT(is8Bit()); return m_data8; } |
| ALWAYS_INLINE const UChar* characters16() const { ASSERT(!is8Bit()); return m_data16; } |
| |
| template <typename CharType> |
| ALWAYS_INLINE const CharType *characters() const; |
| |
| size_t cost() const |
| { |
| // For substrings, return the cost of the base string. |
| if (bufferOwnership() == BufferSubstring) |
| return substringBuffer()->cost(); |
| |
| // Note: we must not alter the m_hashAndFlags field in instances of StaticStringImpl. |
| // We ensure this by pre-setting the s_hashFlagDidReportCost bit in all instances of |
| // StaticStringImpl. As a result, StaticStringImpl instances will always return a cost of |
| // 0 here and avoid modifying m_hashAndFlags. |
| if (m_hashAndFlags & s_hashFlagDidReportCost) |
| return 0; |
| |
| m_hashAndFlags |= s_hashFlagDidReportCost; |
| size_t result = m_length; |
| if (!is8Bit()) |
| result <<= 1; |
| return result; |
| } |
| |
| size_t costDuringGC() |
| { |
| if (isStatic()) |
| return 0; |
| |
| if (bufferOwnership() == BufferSubstring) |
| return divideRoundedUp(substringBuffer()->costDuringGC(), refCount()); |
| |
| size_t result = m_length; |
| if (!is8Bit()) |
| result <<= 1; |
| return divideRoundedUp(result, refCount()); |
| } |
| |
| WTF_EXPORT_STRING_API size_t sizeInBytes() const; |
| |
| StringKind stringKind() const { return static_cast<StringKind>(m_hashAndFlags & s_hashMaskStringKind); } |
| bool isSymbol() const { return m_hashAndFlags & s_hashFlagStringKindIsSymbol; } |
| bool isAtomic() const { return m_hashAndFlags & s_hashFlagStringKindIsAtomic; } |
| |
| void setIsAtomic(bool isAtomic) |
| { |
| ASSERT(!isStatic()); |
| ASSERT(!isSymbol()); |
| if (isAtomic) { |
| m_hashAndFlags |= s_hashFlagStringKindIsAtomic; |
| ASSERT(stringKind() == StringAtomic); |
| } else { |
| m_hashAndFlags &= ~s_hashFlagStringKindIsAtomic; |
| ASSERT(stringKind() == StringNormal); |
| } |
| } |
| |
| #if STRING_STATS |
| bool isSubString() const { return bufferOwnership() == BufferSubstring; } |
| #endif |
| |
| static WTF_EXPORT_STRING_API CString utf8ForCharacters(const LChar* characters, unsigned length); |
| static WTF_EXPORT_STRING_API CString utf8ForCharacters(const UChar* characters, unsigned length, ConversionMode = LenientConversion); |
| WTF_EXPORT_STRING_API CString utf8ForRange(unsigned offset, unsigned length, ConversionMode = LenientConversion) const; |
| WTF_EXPORT_STRING_API CString utf8(ConversionMode = LenientConversion) const; |
| |
| private: |
| static WTF_EXPORT_STRING_API bool utf8Impl(const UChar* characters, unsigned length, char*& buffer, size_t bufferSize, ConversionMode); |
| |
| // The high bits of 'hash' are always empty, but we prefer to store our flags |
| // in the low bits because it makes them slightly more efficient to access. |
| // So, we shift left and right when setting and getting our hash code. |
| void setHash(unsigned hash) const |
| { |
| ASSERT(!hasHash()); |
| ASSERT(!isStatic()); |
| // Multiple clients assume that StringHasher is the canonical string hash function. |
| ASSERT(hash == (is8Bit() ? StringHasher::computeHashAndMaskTop8Bits(m_data8, m_length) : StringHasher::computeHashAndMaskTop8Bits(m_data16, m_length))); |
| ASSERT(!(hash & (s_flagMask << (8 * sizeof(hash) - s_flagCount)))); // Verify that enough high bits are empty. |
| |
| hash <<= s_flagCount; |
| ASSERT(!(hash & m_hashAndFlags)); // Verify that enough low bits are empty after shift. |
| ASSERT(hash); // Verify that 0 is a valid sentinel hash value. |
| |
| m_hashAndFlags |= hash; // Store hash with flags in low bits. |
| } |
| |
| unsigned rawHash() const |
| { |
| return m_hashAndFlags >> s_flagCount; |
| } |
| |
| public: |
| bool hasHash() const |
| { |
| return rawHash() != 0; |
| } |
| |
| unsigned existingHash() const |
| { |
| ASSERT(hasHash()); |
| return rawHash(); |
| } |
| |
| unsigned hash() const |
| { |
| if (hasHash()) |
| return existingHash(); |
| return hashSlowCase(); |
| } |
| |
| WTF_EXPORT_PRIVATE unsigned concurrentHash() const; |
| |
| unsigned symbolAwareHash() const; |
| unsigned existingSymbolAwareHash() const; |
| |
| bool isStatic() const { return m_refCount & s_refCountFlagIsStaticString; } |
| |
| inline size_t refCount() const |
| { |
| return m_refCount / s_refCountIncrement; |
| } |
| |
| inline bool hasOneRef() const |
| { |
| return m_refCount == s_refCountIncrement; |
| } |
| |
| // This method is useful for assertions. |
| inline bool hasAtLeastOneRef() const |
| { |
| return !!m_refCount; |
| } |
| |
| inline void ref() |
| { |
| STRING_STATS_REF_STRING(*this); |
| |
| m_refCount += s_refCountIncrement; |
| } |
| |
| inline void deref() |
| { |
| STRING_STATS_DEREF_STRING(*this); |
| |
| unsigned tempRefCount = m_refCount - s_refCountIncrement; |
| if (!tempRefCount) { |
| StringImpl::destroy(this); |
| return; |
| } |
| m_refCount = tempRefCount; |
| } |
| |
| class StaticStringImpl : private StringImplShape { |
| WTF_MAKE_NONCOPYABLE(StaticStringImpl); |
| public: |
| // Used to construct static strings, which have an special refCount that can never hit zero. |
| // This means that the static string will never be destroyed, which is important because |
| // static strings will be shared across threads & ref-counted in a non-threadsafe manner. |
| // |
| // In order to make StaticStringImpl thread safe, we also need to ensure that the rest of |
| // the fields are never mutated by threads. We have this guarantee because: |
| // |
| // 1. m_length is only set on construction and never mutated thereafter. |
| // |
| // 2. m_data8 and m_data16 are only set on construction and never mutated thereafter. |
| // We also know that a StringImpl never changes from 8 bit to 16 bit because there |
| // is no way to set/clear the s_hashFlag8BitBuffer flag other than at construction. |
| // |
| // 3. m_hashAndFlags will not be mutated by different threads because: |
| // |
| // a. StaticStringImpl's constructor sets the s_hashFlagDidReportCost flag to ensure |
| // that StringImpl::cost() returns early. |
| // This means StaticStringImpl costs are not counted. But since there should only |
| // be a finite set of StaticStringImpls, their cost can be aggregated into a single |
| // system cost if needed. |
| // b. setIsAtomic() is never called on a StaticStringImpl. |
| // setIsAtomic() asserts !isStatic(). |
| // c. setHash() is never called on a StaticStringImpl. |
| // StaticStringImpl's constructor sets the hash on construction. |
| // StringImpl::hash() only sets a new hash iff !hasHash(). |
| // Additionally, StringImpl::setHash() asserts hasHash() and !isStatic(). |
| |
| template<unsigned characterCount> |
| constexpr StaticStringImpl(const char (&characters)[characterCount], StringKind stringKind = StringNormal) |
| : StringImplShape(s_refCountFlagIsStaticString, characterCount - 1, characters, |
| s_hashFlag8BitBuffer | s_hashFlagDidReportCost | stringKind | BufferInternal | (StringHasher::computeLiteralHashAndMaskTop8Bits(characters) << s_flagCount), ConstructWithConstExpr) |
| { |
| } |
| |
| template<unsigned characterCount> |
| constexpr StaticStringImpl(const char16_t (&characters)[characterCount], StringKind stringKind = StringNormal) |
| : StringImplShape(s_refCountFlagIsStaticString, characterCount - 1, characters, |
| s_hashFlagDidReportCost | stringKind | BufferInternal | (StringHasher::computeLiteralHashAndMaskTop8Bits(characters) << s_flagCount), ConstructWithConstExpr) |
| { |
| } |
| |
| operator StringImpl&() |
| { |
| return *reinterpret_cast<StringImpl*>(this); |
| } |
| }; |
| |
| WTF_EXPORTDATA static StaticStringImpl s_atomicEmptyString; |
| ALWAYS_INLINE static StringImpl* empty() { return reinterpret_cast<StringImpl*>(&s_atomicEmptyString); } |
| |
| // FIXME: Does this really belong in StringImpl? |
| template <typename T> static void copyChars(T* destination, const T* source, unsigned numCharacters) |
| { |
| if (numCharacters == 1) { |
| *destination = *source; |
| return; |
| } |
| memcpy(destination, source, numCharacters * sizeof(T)); |
| } |
| |
| ALWAYS_INLINE static void copyChars(UChar* destination, const LChar* source, unsigned numCharacters) |
| { |
| for (unsigned i = 0; i < numCharacters; ++i) |
| destination[i] = source[i]; |
| } |
| |
| // Some string features, like refcounting and the atomicity flag, are not |
| // thread-safe. We achieve thread safety by isolation, giving each thread |
| // its own copy of the string. |
| Ref<StringImpl> isolatedCopy() const; |
| |
| WTF_EXPORT_STRING_API Ref<StringImpl> substring(unsigned pos, unsigned len = UINT_MAX); |
| |
| UChar at(unsigned i) const |
| { |
| ASSERT_WITH_SECURITY_IMPLICATION(i < m_length); |
| if (is8Bit()) |
| return m_data8[i]; |
| return m_data16[i]; |
| } |
| UChar operator[](unsigned i) const { return at(i); } |
| WTF_EXPORT_STRING_API UChar32 characterStartingAt(unsigned); |
| |
| WTF_EXPORT_STRING_API 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); |
| |
| WTF_EXPORT_STRING_API 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 |
| |
| // FIXME: Like the strict functions above, these give false for "ok" when there is trailing garbage. |
| // Like the non-strict functions above, these return the value when there is trailing garbage. |
| // It would be better if these were more consistent with the above functions instead. |
| double toDouble(bool* ok = 0); |
| float toFloat(bool* ok = 0); |
| |
| WTF_EXPORT_STRING_API Ref<StringImpl> convertToASCIILowercase(); |
| WTF_EXPORT_STRING_API Ref<StringImpl> convertToASCIIUppercase(); |
| WTF_EXPORT_STRING_API Ref<StringImpl> convertToLowercaseWithoutLocale(); |
| WTF_EXPORT_STRING_API Ref<StringImpl> convertToLowercaseWithoutLocaleStartingAtFailingIndex8Bit(unsigned); |
| WTF_EXPORT_STRING_API Ref<StringImpl> convertToUppercaseWithoutLocale(); |
| WTF_EXPORT_STRING_API Ref<StringImpl> convertToLowercaseWithLocale(const AtomicString& localeIdentifier); |
| WTF_EXPORT_STRING_API Ref<StringImpl> convertToUppercaseWithLocale(const AtomicString& localeIdentifier); |
| |
| Ref<StringImpl> foldCase(); |
| |
| Ref<StringImpl> stripWhiteSpace(); |
| Ref<StringImpl> stripWhiteSpace(IsWhiteSpaceFunctionPtr); |
| WTF_EXPORT_STRING_API Ref<StringImpl> simplifyWhiteSpace(); |
| Ref<StringImpl> simplifyWhiteSpace(IsWhiteSpaceFunctionPtr); |
| |
| Ref<StringImpl> removeCharacters(CharacterMatchFunctionPtr); |
| template <typename CharType> |
| ALWAYS_INLINE Ref<StringImpl> removeCharacters(const CharType* characters, CharacterMatchFunctionPtr); |
| |
| size_t find(LChar character, unsigned start = 0); |
| size_t find(char character, unsigned start = 0); |
| size_t find(UChar character, unsigned start = 0); |
| WTF_EXPORT_STRING_API size_t find(CharacterMatchFunctionPtr, unsigned index = 0); |
| size_t find(const LChar*, unsigned index = 0); |
| ALWAYS_INLINE size_t find(const char* s, unsigned index = 0) { return find(reinterpret_cast<const LChar*>(s), index); } |
| WTF_EXPORT_STRING_API size_t find(StringImpl*); |
| WTF_EXPORT_STRING_API size_t find(StringImpl*, unsigned index); |
| size_t findIgnoringCase(const LChar*, unsigned index = 0); |
| ALWAYS_INLINE size_t findIgnoringCase(const char* s, unsigned index = 0) { return findIgnoringCase(reinterpret_cast<const LChar*>(s), index); } |
| WTF_EXPORT_STRING_API size_t findIgnoringCase(StringImpl*, unsigned index = 0); |
| WTF_EXPORT_STRING_API size_t findIgnoringASCIICase(const StringImpl&) const; |
| WTF_EXPORT_STRING_API size_t findIgnoringASCIICase(const StringImpl&, unsigned startOffset) const; |
| WTF_EXPORT_STRING_API size_t findIgnoringASCIICase(const StringImpl*) const; |
| WTF_EXPORT_STRING_API size_t findIgnoringASCIICase(const StringImpl*, unsigned startOffset) const; |
| |
| WTF_EXPORT_STRING_API size_t reverseFind(UChar, unsigned index = UINT_MAX); |
| WTF_EXPORT_STRING_API size_t reverseFind(StringImpl*, unsigned index = UINT_MAX); |
| WTF_EXPORT_STRING_API size_t reverseFindIgnoringCase(StringImpl*, unsigned index = UINT_MAX); |
| |
| WTF_EXPORT_STRING_API bool startsWith(const StringImpl*) const; |
| WTF_EXPORT_STRING_API bool startsWith(const StringImpl&) const; |
| WTF_EXPORT_STRING_API bool startsWithIgnoringASCIICase(const StringImpl*) const; |
| WTF_EXPORT_STRING_API bool startsWithIgnoringASCIICase(const StringImpl&) const; |
| bool startsWith(StringImpl* str, bool caseSensitive) { return caseSensitive ? startsWith(str) : (reverseFindIgnoringCase(str, 0) == 0); } |
| WTF_EXPORT_STRING_API bool startsWith(UChar) const; |
| WTF_EXPORT_STRING_API bool startsWith(const char*, unsigned matchLength, bool caseSensitive) const; |
| template<unsigned matchLength> |
| bool startsWith(const char (&prefix)[matchLength], bool caseSensitive = true) const { return startsWith(prefix, matchLength - 1, caseSensitive); } |
| WTF_EXPORT_STRING_API bool hasInfixStartingAt(const StringImpl&, unsigned startOffset) const; |
| |
| WTF_EXPORT_STRING_API bool endsWith(StringImpl*); |
| WTF_EXPORT_STRING_API bool endsWith(StringImpl&); |
| WTF_EXPORT_STRING_API bool endsWithIgnoringASCIICase(const StringImpl*) const; |
| WTF_EXPORT_STRING_API bool endsWithIgnoringASCIICase(const StringImpl&) const; |
| WTF_EXPORT_STRING_API bool endsWith(StringImpl*, bool caseSensitive); |
| WTF_EXPORT_STRING_API bool endsWith(UChar) const; |
| WTF_EXPORT_STRING_API bool endsWith(const char*, unsigned matchLength, bool caseSensitive) const; |
| template<unsigned matchLength> |
| bool endsWith(const char (&prefix)[matchLength], bool caseSensitive = true) const { return endsWith(prefix, matchLength - 1, caseSensitive); } |
| WTF_EXPORT_STRING_API bool hasInfixEndingAt(const StringImpl&, unsigned endOffset) const; |
| |
| WTF_EXPORT_STRING_API Ref<StringImpl> replace(UChar, UChar); |
| WTF_EXPORT_STRING_API Ref<StringImpl> replace(UChar, StringImpl*); |
| ALWAYS_INLINE Ref<StringImpl> replace(UChar pattern, const char* replacement, unsigned replacementLength) { return replace(pattern, reinterpret_cast<const LChar*>(replacement), replacementLength); } |
| WTF_EXPORT_STRING_API Ref<StringImpl> replace(UChar, const LChar*, unsigned replacementLength); |
| Ref<StringImpl> replace(UChar, const UChar*, unsigned replacementLength); |
| WTF_EXPORT_STRING_API Ref<StringImpl> replace(StringImpl*, StringImpl*); |
| WTF_EXPORT_STRING_API Ref<StringImpl> replace(unsigned index, unsigned len, StringImpl*); |
| |
| WTF_EXPORT_STRING_API UCharDirection defaultWritingDirection(bool* hasStrongDirectionality = nullptr); |
| |
| #if USE(CF) |
| RetainPtr<CFStringRef> createCFString(); |
| #endif |
| #ifdef __OBJC__ |
| WTF_EXPORT_STRING_API operator NSString *(); |
| #endif |
| |
| #if STRING_STATS |
| ALWAYS_INLINE static StringStats& stringStats() { return m_stringStats; } |
| #endif |
| |
| protected: |
| ~StringImpl(); |
| |
| enum CreateSymbolTag { CreateSymbol }; |
| |
| // Used to create new symbol strings that holds existing 8-bit [[Description]] string as a substring buffer (BufferSubstring). |
| StringImpl(CreateSymbolTag, const LChar* characters, unsigned length) |
| : StringImplShape(s_refCountIncrement, length, characters, s_hashFlag8BitBuffer | StringSymbol | BufferSubstring) |
| { |
| ASSERT(is8Bit()); |
| ASSERT(m_data8); |
| STRING_STATS_ADD_8BIT_STRING2(m_length, true); |
| } |
| |
| // Used to create new symbol strings that holds existing 16-bit [[Description]] string as a substring buffer (BufferSubstring). |
| StringImpl(CreateSymbolTag, const UChar* characters, unsigned length) |
| : StringImplShape(s_refCountIncrement, length, characters, StringSymbol | BufferSubstring) |
| { |
| ASSERT(!is8Bit()); |
| ASSERT(m_data16); |
| STRING_STATS_ADD_16BIT_STRING2(m_length, true); |
| } |
| |
| // Null symbol. |
| StringImpl(CreateSymbolTag) |
| : StringImplShape(s_refCountIncrement, 0, empty()->characters8(), s_hashFlag8BitBuffer | StringSymbol | BufferSubstring) |
| { |
| ASSERT(is8Bit()); |
| ASSERT(m_data8); |
| STRING_STATS_ADD_8BIT_STRING2(m_length, true); |
| } |
| |
| template<typename T> |
| static size_t allocationSize(Checked<size_t> tailElementCount) |
| { |
| return (tailOffset<T>() + tailElementCount * sizeof(T)).unsafeGet(); |
| } |
| |
| template<typename T> |
| static size_t tailOffset() |
| { |
| #if COMPILER(MSVC) |
| // MSVC doesn't support alignof yet. |
| return roundUpToMultipleOf<sizeof(T)>(sizeof(StringImpl)); |
| #else |
| return roundUpToMultipleOf<alignof(T)>(offsetof(StringImpl, m_hashAndFlags) + sizeof(StringImpl::m_hashAndFlags)); |
| #endif |
| } |
| |
| private: |
| bool requiresCopy() const |
| { |
| if (bufferOwnership() != BufferInternal) |
| return true; |
| |
| if (is8Bit()) |
| return m_data8 == tailPointer<LChar>(); |
| return m_data16 == tailPointer<UChar>(); |
| } |
| |
| template<typename T> |
| const T* tailPointer() const |
| { |
| return reinterpret_cast_ptr<const T*>(reinterpret_cast<const uint8_t*>(this) + tailOffset<T>()); |
| } |
| |
| template<typename T> |
| T* tailPointer() |
| { |
| return reinterpret_cast_ptr<T*>(reinterpret_cast<uint8_t*>(this) + tailOffset<T>()); |
| } |
| |
| StringImpl* const& substringBuffer() const |
| { |
| ASSERT(bufferOwnership() == BufferSubstring); |
| |
| return *tailPointer<StringImpl*>(); |
| } |
| |
| StringImpl*& substringBuffer() |
| { |
| ASSERT(bufferOwnership() == BufferSubstring); |
| |
| return *tailPointer<StringImpl*>(); |
| } |
| |
| enum class CaseConvertType { Upper, Lower }; |
| template<CaseConvertType type, typename CharacterType> static Ref<StringImpl> convertASCIICase(StringImpl&, const CharacterType*, unsigned); |
| |
| BufferOwnership bufferOwnership() const { return static_cast<BufferOwnership>(m_hashAndFlags & s_hashMaskBufferOwnership); } |
| template <class UCharPredicate> Ref<StringImpl> stripMatchedCharacters(UCharPredicate); |
| template <typename CharType, class UCharPredicate> Ref<StringImpl> simplifyMatchedCharactersToSpace(UCharPredicate); |
| template <typename CharType> static Ref<StringImpl> constructInternal(StringImpl*, unsigned); |
| template <typename CharType> static Ref<StringImpl> createUninitializedInternal(unsigned, CharType*&); |
| template <typename CharType> static Ref<StringImpl> createUninitializedInternalNonEmpty(unsigned, CharType*&); |
| template <typename CharType> static Ref<StringImpl> reallocateInternal(Ref<StringImpl>&&, unsigned, CharType*&); |
| template <typename CharType> static Ref<StringImpl> createInternal(const CharType*, unsigned); |
| WTF_EXPORT_PRIVATE NEVER_INLINE unsigned hashSlowCase() const; |
| |
| // The bottom bit in the ref count indicates a static (immortal) string. |
| static const unsigned s_refCountFlagIsStaticString = 0x1; |
| static const unsigned s_refCountIncrement = 0x2; // This allows us to ref / deref without disturbing the static string flag. |
| |
| #if STRING_STATS |
| WTF_EXPORTDATA static StringStats m_stringStats; |
| #endif |
| |
| public: |
| #ifndef NDEBUG |
| void assertHashIsCorrect() |
| { |
| ASSERT(hasHash()); |
| ASSERT(existingHash() == StringHasher::computeHashAndMaskTop8Bits(characters8(), length())); |
| } |
| #endif |
| }; |
| |
| using StaticStringImpl = StringImpl::StaticStringImpl; |
| |
| static_assert(sizeof(StringImpl) == sizeof(StaticStringImpl), ""); |
| |
| #if ASSERT_ENABLED |
| // StringImpls created from StaticStringImpl will ASSERT |
| // in the generic ValueCheck<T>::checkConsistency |
| // as they are not allocated by fastMalloc. |
| // We don't currently have any way to detect that case |
| // so we ignore the consistency check for all StringImpl*. |
| template<> struct |
| ValueCheck<StringImpl*> { |
| static void checkConsistency(const StringImpl*) { } |
| }; |
| #endif |
| |
| template <> |
| ALWAYS_INLINE Ref<StringImpl> StringImpl::constructInternal<LChar>(StringImpl* impl, unsigned length) { return adoptRef(*new (NotNull, impl) StringImpl(length, Force8BitConstructor)); } |
| template <> |
| ALWAYS_INLINE Ref<StringImpl> StringImpl::constructInternal<UChar>(StringImpl* impl, unsigned length) { return adoptRef(*new (NotNull, impl) StringImpl(length)); } |
| |
| template <> |
| ALWAYS_INLINE const LChar* StringImpl::characters<LChar>() const { return characters8(); } |
| |
| template <> |
| ALWAYS_INLINE const UChar* StringImpl::characters<UChar>() const { return characters16(); } |
| |
| WTF_EXPORT_STRING_API bool equal(const StringImpl*, const StringImpl*); |
| WTF_EXPORT_STRING_API bool equal(const StringImpl*, const LChar*); |
| inline bool equal(const StringImpl* a, const char* b) { return equal(a, reinterpret_cast<const LChar*>(b)); } |
| WTF_EXPORT_STRING_API bool equal(const StringImpl*, const LChar*, unsigned); |
| WTF_EXPORT_STRING_API bool equal(const StringImpl*, const UChar*, unsigned); |
| inline bool equal(const StringImpl* a, const char* b, unsigned length) { return equal(a, reinterpret_cast<const LChar*>(b), length); } |
| inline bool equal(const LChar* a, StringImpl* b) { return equal(b, a); } |
| inline bool equal(const char* a, StringImpl* b) { return equal(b, reinterpret_cast<const LChar*>(a)); } |
| WTF_EXPORT_STRING_API bool equal(const StringImpl& a, const StringImpl& b); |
| |
| WTF_EXPORT_STRING_API bool equalIgnoringNullity(StringImpl*, StringImpl*); |
| WTF_EXPORT_STRING_API bool equalIgnoringNullity(const UChar*, size_t length, StringImpl*); |
| |
| bool equalIgnoringASCIICase(const StringImpl&, const StringImpl&); |
| WTF_EXPORT_STRING_API bool equalIgnoringASCIICase(const StringImpl*, const StringImpl*); |
| bool equalIgnoringASCIICase(const StringImpl&, const char*); |
| bool equalIgnoringASCIICase(const StringImpl*, const char*); |
| |
| WTF_EXPORT_STRING_API bool equalIgnoringASCIICaseNonNull(const StringImpl*, const StringImpl*); |
| |
| template<unsigned length> bool equalLettersIgnoringASCIICase(const StringImpl&, const char (&lowercaseLetters)[length]); |
| template<unsigned length> bool equalLettersIgnoringASCIICase(const StringImpl*, const char (&lowercaseLetters)[length]); |
| |
| inline size_t find(const LChar* characters, unsigned length, CharacterMatchFunctionPtr matchFunction, unsigned index = 0) |
| { |
| while (index < length) { |
| if (matchFunction(characters[index])) |
| return index; |
| ++index; |
| } |
| return notFound; |
| } |
| |
| inline size_t find(const UChar* characters, unsigned length, CharacterMatchFunctionPtr matchFunction, unsigned index = 0) |
| { |
| while (index < length) { |
| if (matchFunction(characters[index])) |
| return index; |
| ++index; |
| } |
| return notFound; |
| } |
| |
| template<typename CharacterType> |
| inline size_t reverseFindLineTerminator(const CharacterType* characters, unsigned length, unsigned index = UINT_MAX) |
| { |
| if (!length) |
| return notFound; |
| if (index >= length) |
| index = length - 1; |
| CharacterType c = characters[index]; |
| while ((c != '\n') && (c != '\r')) { |
| if (!index--) |
| return notFound; |
| c = characters[index]; |
| } |
| return index; |
| } |
| |
| template<typename CharacterType> |
| inline size_t reverseFind(const CharacterType* characters, unsigned length, CharacterType matchCharacter, unsigned index = UINT_MAX) |
| { |
| if (!length) |
| return notFound; |
| if (index >= length) |
| index = length - 1; |
| while (characters[index] != matchCharacter) { |
| if (!index--) |
| return notFound; |
| } |
| return index; |
| } |
| |
| ALWAYS_INLINE size_t reverseFind(const UChar* characters, unsigned length, LChar matchCharacter, unsigned index = UINT_MAX) |
| { |
| return reverseFind(characters, length, static_cast<UChar>(matchCharacter), index); |
| } |
| |
| inline size_t reverseFind(const LChar* characters, unsigned length, UChar matchCharacter, unsigned index = UINT_MAX) |
| { |
| if (matchCharacter & ~0xFF) |
| return notFound; |
| return reverseFind(characters, length, static_cast<LChar>(matchCharacter), index); |
| } |
| |
| inline size_t StringImpl::find(LChar character, unsigned start) |
| { |
| if (is8Bit()) |
| return WTF::find(characters8(), m_length, character, start); |
| return WTF::find(characters16(), m_length, character, start); |
| } |
| |
| ALWAYS_INLINE size_t StringImpl::find(char character, unsigned start) |
| { |
| return find(static_cast<LChar>(character), start); |
| } |
| |
| inline size_t StringImpl::find(UChar character, unsigned start) |
| { |
| if (is8Bit()) |
| return WTF::find(characters8(), m_length, character, start); |
| return WTF::find(characters16(), m_length, character, start); |
| } |
| |
| template<size_t inlineCapacity> inline bool equalIgnoringNullity(const Vector<UChar, inlineCapacity>& a, StringImpl* b) |
| { |
| return equalIgnoringNullity(a.data(), a.size(), b); |
| } |
| |
| template<typename CharacterType1, typename CharacterType2> |
| inline int codePointCompare(unsigned l1, unsigned l2, const CharacterType1* c1, const CharacterType2* c2) |
| { |
| const unsigned lmin = l1 < l2 ? l1 : l2; |
| unsigned pos = 0; |
| while (pos < lmin && *c1 == *c2) { |
| ++c1; |
| ++c2; |
| ++pos; |
| } |
| |
| if (pos < lmin) |
| return (c1[0] > c2[0]) ? 1 : -1; |
| |
| if (l1 == l2) |
| return 0; |
| |
| return (l1 > l2) ? 1 : -1; |
| } |
| |
| inline int codePointCompare8(const StringImpl* string1, const StringImpl* string2) |
| { |
| return codePointCompare(string1->length(), string2->length(), string1->characters8(), string2->characters8()); |
| } |
| |
| inline int codePointCompare16(const StringImpl* string1, const StringImpl* string2) |
| { |
| return codePointCompare(string1->length(), string2->length(), string1->characters16(), string2->characters16()); |
| } |
| |
| inline int codePointCompare8To16(const StringImpl* string1, const StringImpl* string2) |
| { |
| return codePointCompare(string1->length(), string2->length(), string1->characters8(), string2->characters16()); |
| } |
| |
| inline int codePointCompare(const StringImpl* string1, const StringImpl* string2) |
| { |
| if (!string1) |
| return (string2 && string2->length()) ? -1 : 0; |
| |
| if (!string2) |
| return string1->length() ? 1 : 0; |
| |
| bool string1Is8Bit = string1->is8Bit(); |
| bool string2Is8Bit = string2->is8Bit(); |
| if (string1Is8Bit) { |
| if (string2Is8Bit) |
| return codePointCompare8(string1, string2); |
| return codePointCompare8To16(string1, string2); |
| } |
| if (string2Is8Bit) |
| return -codePointCompare8To16(string2, string1); |
| return codePointCompare16(string1, string2); |
| } |
| |
| inline bool isSpaceOrNewline(UChar32 c) |
| { |
| // Use isASCIISpace() for basic Latin-1. |
| // This will include newlines, which aren't included in Unicode DirWS. |
| return c <= 0x7F ? isASCIISpace(c) : u_charDirection(c) == U_WHITE_SPACE_NEUTRAL; |
| } |
| |
| template<typename CharacterType> |
| inline unsigned lengthOfNullTerminatedString(const CharacterType* string) |
| { |
| ASSERT(string); |
| size_t length = 0; |
| while (string[length]) |
| ++length; |
| |
| RELEASE_ASSERT(length < std::numeric_limits<unsigned>::max()); |
| return static_cast<unsigned>(length); |
| } |
| |
| inline Ref<StringImpl> StringImpl::isolatedCopy() const |
| { |
| if (!requiresCopy()) { |
| if (is8Bit()) |
| return StringImpl::createWithoutCopying(m_data8, m_length); |
| return StringImpl::createWithoutCopying(m_data16, m_length); |
| } |
| |
| if (is8Bit()) |
| return create(m_data8, m_length); |
| return create(m_data16, m_length); |
| } |
| |
| // StringHash is the default hash for StringImpl* and RefPtr<StringImpl> |
| template<typename T> struct DefaultHash; |
| template<> struct DefaultHash<StringImpl*> { |
| typedef StringHash Hash; |
| }; |
| template<> struct DefaultHash<RefPtr<StringImpl>> { |
| typedef StringHash Hash; |
| }; |
| |
| inline bool equalIgnoringASCIICase(const StringImpl& a, const StringImpl& b) |
| { |
| return equalIgnoringASCIICaseCommon(a, b); |
| } |
| |
| inline bool equalIgnoringASCIICase(const StringImpl& a, const char* b) |
| { |
| return equalIgnoringASCIICaseCommon(a, b); |
| } |
| |
| inline bool equalIgnoringASCIICase(const StringImpl* a, const char* b) |
| { |
| return a && equalIgnoringASCIICase(*a, b); |
| } |
| |
| template<unsigned length> inline bool startsWithLettersIgnoringASCIICase(const StringImpl& string, const char (&lowercaseLetters)[length]) |
| { |
| return startsWithLettersIgnoringASCIICaseCommon(string, lowercaseLetters); |
| } |
| |
| template<unsigned length> inline bool startsWithLettersIgnoringASCIICase(const StringImpl* string, const char (&lowercaseLetters)[length]) |
| { |
| return string && startsWithLettersIgnoringASCIICase(*string, lowercaseLetters); |
| } |
| |
| template<unsigned length> inline bool equalLettersIgnoringASCIICase(const StringImpl& string, const char (&lowercaseLetters)[length]) |
| { |
| return equalLettersIgnoringASCIICaseCommon(string, lowercaseLetters); |
| } |
| |
| template<unsigned length> inline bool equalLettersIgnoringASCIICase(const StringImpl* string, const char (&lowercaseLetters)[length]) |
| { |
| return string && equalLettersIgnoringASCIICase(*string, lowercaseLetters); |
| } |
| |
| #define MAKE_STATIC_STRING_IMPL(characters) ([] { \ |
| static StaticStringImpl impl(characters); \ |
| return &impl; \ |
| }()) |
| |
| |
| } // namespace WTF |
| |
| using WTF::StringImpl; |
| using WTF::StaticStringImpl; |
| using WTF::equal; |
| using WTF::TextCaseSensitivity; |
| using WTF::TextCaseSensitive; |
| using WTF::TextCaseInsensitive; |
| |
| #endif |