| // Copyright (c) 2014, the Dart project authors. Please see the AUTHORS file |
| // for details. All rights reserved. Use of this source code is governed by a |
| // BSD-style license that can be found in the LICENSE file. |
| |
| #ifndef RUNTIME_VM_UNIBROW_H_ |
| #define RUNTIME_VM_UNIBROW_H_ |
| |
| #include <sys/types.h> |
| |
| #include "vm/globals.h" |
| |
| /** |
| * \file |
| * Definitions and convenience functions for working with unicode. |
| */ |
| |
| namespace unibrow { |
| |
| // 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, intptr_t size = 256> |
| class Mapping { |
| public: |
| inline Mapping() {} |
| inline intptr_t get(int32_t c, int32_t n, int32_t* result); |
| |
| private: |
| friend class Test; |
| intptr_t CalculateValue(int32_t c, int32_t n, int32_t* result); |
| struct CacheEntry { |
| inline CacheEntry() : code_point_(kNoChar), offset_(0) {} |
| inline CacheEntry(int32_t code_point, signed offset) |
| : code_point_(code_point), offset_(offset) {} |
| int32_t code_point_; |
| signed offset_; |
| static constexpr intptr_t kNoChar = (1 << 21) - 1; |
| }; |
| static constexpr intptr_t kSize = size; |
| static constexpr intptr_t kMask = kSize - 1; |
| CacheEntry entries_[kSize]; |
| }; |
| |
| struct Letter { |
| static bool Is(int32_t c); |
| }; |
| struct Ecma262Canonicalize { |
| static constexpr intptr_t kMaxWidth = 1; |
| static intptr_t Convert(int32_t c, |
| int32_t n, |
| int32_t* result, |
| bool* allow_caching_ptr); |
| }; |
| struct Ecma262UnCanonicalize { |
| static constexpr intptr_t kMaxWidth = 4; |
| static intptr_t Convert(int32_t c, |
| int32_t n, |
| int32_t* result, |
| bool* allow_caching_ptr); |
| }; |
| struct CanonicalizationRange { |
| static constexpr intptr_t kMaxWidth = 1; |
| static intptr_t Convert(int32_t c, |
| int32_t n, |
| int32_t* result, |
| bool* allow_caching_ptr); |
| }; |
| |
| } // namespace unibrow |
| |
| #endif // RUNTIME_VM_UNIBROW_H_ |