| // Copyright 2011 the V8 project authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #ifndef V8_UNICODE_H_ |
| #define V8_UNICODE_H_ |
| |
| #include <sys/types.h> |
| #include "src/globals.h" |
| /** |
| * \file |
| * Definitions and convenience functions for working with unicode. |
| */ |
| |
| namespace unibrow { |
| |
| typedef unsigned int uchar; |
| typedef unsigned char byte; |
| |
| /** |
| * The max length of the result of converting the case of a single |
| * character. |
| */ |
| const int kMaxMappingSize = 4; |
| |
| template <class T, int size = 256> |
| class Predicate { |
| public: |
| inline Predicate() { } |
| inline bool get(uchar c); |
| private: |
| friend class Test; |
| bool CalculateValue(uchar c); |
| struct CacheEntry { |
| inline CacheEntry() : code_point_(0), value_(0) { } |
| inline CacheEntry(uchar code_point, bool value) |
| : code_point_(code_point), |
| value_(value) { } |
| uchar code_point_ : 21; |
| bool value_ : 1; |
| }; |
| static const int kSize = size; |
| static const int kMask = kSize - 1; |
| CacheEntry entries_[kSize]; |
| }; |
| |
| // A cache used in case conversion. It caches the value for characters |
| // that either have no mapping or map to a single character independent |
| // of context. Characters that map to more than one character or that |
| // map differently depending on context are always looked up. |
| template <class T, int size = 256> |
| class Mapping { |
| public: |
| inline Mapping() { } |
| inline int get(uchar c, uchar n, uchar* result); |
| private: |
| friend class Test; |
| int CalculateValue(uchar c, uchar n, uchar* result); |
| struct CacheEntry { |
| inline CacheEntry() : code_point_(kNoChar), offset_(0) { } |
| inline CacheEntry(uchar code_point, signed offset) |
| : code_point_(code_point), |
| offset_(offset) { } |
| uchar code_point_; |
| signed offset_; |
| static const int kNoChar = (1 << 21) - 1; |
| }; |
| static const int kSize = size; |
| static const int kMask = kSize - 1; |
| CacheEntry entries_[kSize]; |
| }; |
| |
| class UnicodeData { |
| private: |
| friend class Test; |
| static int GetByteCount(); |
| static const uchar kMaxCodePoint; |
| }; |
| |
| class Utf16 { |
| public: |
| static inline bool IsSurrogatePair(int lead, int trail) { |
| return IsLeadSurrogate(lead) && IsTrailSurrogate(trail); |
| } |
| static inline bool IsLeadSurrogate(int code) { |
| if (code == kNoPreviousCharacter) return false; |
| return (code & 0xfc00) == 0xd800; |
| } |
| static inline bool IsTrailSurrogate(int code) { |
| if (code == kNoPreviousCharacter) return false; |
| return (code & 0xfc00) == 0xdc00; |
| } |
| |
| static inline int CombineSurrogatePair(uchar lead, uchar trail) { |
| return 0x10000 + ((lead & 0x3ff) << 10) + (trail & 0x3ff); |
| } |
| static const int kNoPreviousCharacter = -1; |
| static const uchar kMaxNonSurrogateCharCode = 0xffff; |
| // Encoding a single UTF-16 code unit will produce 1, 2 or 3 bytes |
| // of UTF-8 data. The special case where the unit is a surrogate |
| // trail produces 1 byte net, because the encoding of the pair is |
| // 4 bytes and the 3 bytes that were used to encode the lead surrogate |
| // can be reclaimed. |
| static const int kMaxExtraUtf8BytesForOneUtf16CodeUnit = 3; |
| // One UTF-16 surrogate is endoded (illegally) as 3 UTF-8 bytes. |
| // The illegality stems from the surrogate not being part of a pair. |
| static const int kUtf8BytesToCodeASurrogate = 3; |
| static inline uint16_t LeadSurrogate(uint32_t char_code) { |
| return 0xd800 + (((char_code - 0x10000) >> 10) & 0x3ff); |
| } |
| static inline uint16_t TrailSurrogate(uint32_t char_code) { |
| return 0xdc00 + (char_code & 0x3ff); |
| } |
| }; |
| |
| class Latin1 { |
| public: |
| static const unsigned kMaxChar = 0xff; |
| // Returns 0 if character does not convert to single latin-1 character |
| // or if the character doesn't not convert back to latin-1 via inverse |
| // operation (upper to lower, etc). |
| static inline uint16_t ConvertNonLatin1ToLatin1(uint16_t); |
| }; |
| |
| class Utf8 { |
| public: |
| static inline uchar Length(uchar chr, int previous); |
| static inline unsigned EncodeOneByte(char* out, uint8_t c); |
| static inline unsigned Encode(char* out, |
| uchar c, |
| int previous, |
| bool replace_invalid = false); |
| static uchar CalculateValue(const byte* str, |
| unsigned length, |
| unsigned* cursor); |
| |
| // The unicode replacement character, used to signal invalid unicode |
| // sequences (e.g. an orphan surrogate) when converting to a UTF-8 encoding. |
| static const uchar kBadChar = 0xFFFD; |
| static const unsigned kMaxEncodedSize = 4; |
| static const unsigned kMaxOneByteChar = 0x7f; |
| static const unsigned kMaxTwoByteChar = 0x7ff; |
| static const unsigned kMaxThreeByteChar = 0xffff; |
| static const unsigned kMaxFourByteChar = 0x1fffff; |
| |
| // A single surrogate is coded as a 3 byte UTF-8 sequence, but two together |
| // that match are coded as a 4 byte UTF-8 sequence. |
| static const unsigned kBytesSavedByCombiningSurrogates = 2; |
| static const unsigned kSizeOfUnmatchedSurrogate = 3; |
| // The maximum size a single UTF-16 code unit may take up when encoded as |
| // UTF-8. |
| static const unsigned kMax16BitCodeUnitSize = 3; |
| static inline uchar ValueOf(const byte* str, |
| unsigned length, |
| unsigned* cursor); |
| }; |
| |
| |
| class Utf8DecoderBase { |
| public: |
| // Initialization done in subclass. |
| inline Utf8DecoderBase(); |
| inline Utf8DecoderBase(uint16_t* buffer, |
| unsigned buffer_length, |
| const uint8_t* stream, |
| unsigned stream_length); |
| inline unsigned Utf16Length() const { return utf16_length_; } |
| protected: |
| // This reads all characters and sets the utf16_length_. |
| // The first buffer_length utf16 chars are cached in the buffer. |
| void Reset(uint16_t* buffer, |
| unsigned buffer_length, |
| const uint8_t* stream, |
| unsigned stream_length); |
| static void WriteUtf16Slow(const uint8_t* stream, |
| uint16_t* data, |
| unsigned length); |
| const uint8_t* unbuffered_start_; |
| unsigned utf16_length_; |
| bool last_byte_of_buffer_unused_; |
| private: |
| DISALLOW_COPY_AND_ASSIGN(Utf8DecoderBase); |
| }; |
| |
| template <unsigned kBufferSize> |
| class Utf8Decoder : public Utf8DecoderBase { |
| public: |
| inline Utf8Decoder() {} |
| inline Utf8Decoder(const char* stream, unsigned length); |
| inline void Reset(const char* stream, unsigned length); |
| inline unsigned WriteUtf16(uint16_t* data, unsigned length) const; |
| private: |
| uint16_t buffer_[kBufferSize]; |
| }; |
| |
| |
| struct Uppercase { |
| static bool Is(uchar c); |
| }; |
| struct Lowercase { |
| static bool Is(uchar c); |
| }; |
| struct Letter { |
| static bool Is(uchar c); |
| }; |
| struct Number { |
| static bool Is(uchar c); |
| }; |
| struct WhiteSpace { |
| static bool Is(uchar c); |
| }; |
| struct LineTerminator { |
| static bool Is(uchar c); |
| }; |
| struct CombiningMark { |
| static bool Is(uchar c); |
| }; |
| struct ConnectorPunctuation { |
| static bool Is(uchar c); |
| }; |
| struct ToLowercase { |
| static const int kMaxWidth = 3; |
| static const bool kIsToLower = true; |
| static int Convert(uchar c, |
| uchar n, |
| uchar* result, |
| bool* allow_caching_ptr); |
| }; |
| struct ToUppercase { |
| static const int kMaxWidth = 3; |
| static const bool kIsToLower = false; |
| static int Convert(uchar c, |
| uchar n, |
| uchar* result, |
| bool* allow_caching_ptr); |
| }; |
| struct Ecma262Canonicalize { |
| static const int kMaxWidth = 1; |
| static int Convert(uchar c, |
| uchar n, |
| uchar* result, |
| bool* allow_caching_ptr); |
| }; |
| struct Ecma262UnCanonicalize { |
| static const int kMaxWidth = 4; |
| static int Convert(uchar c, |
| uchar n, |
| uchar* result, |
| bool* allow_caching_ptr); |
| }; |
| struct CanonicalizationRange { |
| static const int kMaxWidth = 1; |
| static int Convert(uchar c, |
| uchar n, |
| uchar* result, |
| bool* allow_caching_ptr); |
| }; |
| |
| } // namespace unibrow |
| |
| #endif // V8_UNICODE_H_ |