diff options
Diffstat (limited to 'deps/icu-small/source/common/unicode/bytestrie.h')
-rw-r--r-- | deps/icu-small/source/common/unicode/bytestrie.h | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/deps/icu-small/source/common/unicode/bytestrie.h b/deps/icu-small/source/common/unicode/bytestrie.h index c57b8ccfeb..51405f64a1 100644 --- a/deps/icu-small/source/common/unicode/bytestrie.h +++ b/deps/icu-small/source/common/unicode/bytestrie.h @@ -23,6 +23,9 @@ */ #include "unicode/utypes.h" + +#if U_SHOW_CPLUSPLUS_API + #include "unicode/stringpiece.h" #include "unicode/uobject.h" #include "unicode/ustringtrie.h" @@ -94,6 +97,41 @@ public: return *this; } +#ifndef U_HIDE_DRAFT_API + /** + * Returns the state of this trie as a 64-bit integer. + * The state value is never 0. + * + * @return opaque state value + * @see resetToState64 + * @draft ICU 65 + */ + uint64_t getState64() const { + return (static_cast<uint64_t>(remainingMatchLength_ + 2) << kState64RemainingShift) | + (uint64_t)(pos_ - bytes_); + } + + /** + * Resets this trie to the saved state. + * Unlike resetToState(State), the 64-bit state value + * must be from getState64() from the same trie object or + * from one initialized the exact same way. + * Because of no validation, this method is faster. + * + * @param state The opaque trie state value from getState64(). + * @return *this + * @see getState64 + * @see resetToState + * @see reset + * @draft ICU 65 + */ + BytesTrie &resetToState64(uint64_t state) { + remainingMatchLength_ = static_cast<int32_t>(state >> kState64RemainingShift) - 2; + pos_ = bytes_ + (state & kState64PosMask); + return *this; + } +#endif /* U_HIDE_DRAFT_API */ + /** * BytesTrie state object, for saving a trie's current state * and resetting the trie back to this state later. @@ -502,6 +540,13 @@ private: static const int32_t kMaxTwoByteDelta=((kMinThreeByteDeltaLead-kMinTwoByteDeltaLead)<<8)-1; // 0x2fff static const int32_t kMaxThreeByteDelta=((kFourByteDeltaLead-kMinThreeByteDeltaLead)<<16)-1; // 0xdffff + // For getState64(): + // The remainingMatchLength_ is -1..14=(kMaxLinearMatchLength=0x10)-2 + // so we need at least 5 bits for that. + // We add 2 to store it as a positive value 1..16=kMaxLinearMatchLength. + static constexpr int32_t kState64RemainingShift = 59; + static constexpr uint64_t kState64PosMask = (UINT64_C(1) << kState64RemainingShift) - 1; + uint8_t *ownedArray_; // Fixed value referencing the BytesTrie bytes. @@ -517,4 +562,6 @@ private: U_NAMESPACE_END +#endif /* U_SHOW_CPLUSPLUS_API */ + #endif // __BYTESTRIE_H__ |