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72 lines
2.1 KiB
C++
72 lines
2.1 KiB
C++
// Copyright (c) 2014, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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#ifndef RUNTIME_VM_UNIBROW_H_
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#define RUNTIME_VM_UNIBROW_H_
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#include <sys/types.h>
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#include "vm/globals.h"
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/**
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* \file
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* Definitions and convenience functions for working with unicode.
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*/
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namespace unibrow {
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// A cache used in case conversion. It caches the value for characters
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// that either have no mapping or map to a single character independent
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// of context. Characters that map to more than one character or that
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// map differently depending on context are always looked up.
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template <class T, intptr_t size = 256>
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class Mapping {
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public:
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inline Mapping() {}
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inline intptr_t get(int32_t c, int32_t n, int32_t* result);
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private:
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friend class Test;
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intptr_t CalculateValue(int32_t c, int32_t n, int32_t* result);
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struct CacheEntry {
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inline CacheEntry() : code_point_(kNoChar), offset_(0) {}
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inline CacheEntry(int32_t code_point, signed offset)
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: code_point_(code_point), offset_(offset) {}
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int32_t code_point_;
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signed offset_;
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static const intptr_t kNoChar = (1 << 21) - 1;
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};
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static const intptr_t kSize = size;
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static const intptr_t kMask = kSize - 1;
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CacheEntry entries_[kSize];
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};
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struct Letter {
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static bool Is(int32_t c);
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};
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struct Ecma262Canonicalize {
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static const intptr_t kMaxWidth = 1;
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static intptr_t Convert(int32_t c,
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int32_t n,
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int32_t* result,
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bool* allow_caching_ptr);
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};
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struct Ecma262UnCanonicalize {
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static const intptr_t kMaxWidth = 4;
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static intptr_t Convert(int32_t c,
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int32_t n,
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int32_t* result,
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bool* allow_caching_ptr);
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};
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struct CanonicalizationRange {
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static const intptr_t kMaxWidth = 1;
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static intptr_t Convert(int32_t c,
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int32_t n,
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int32_t* result,
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bool* allow_caching_ptr);
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};
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} // namespace unibrow
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#endif // RUNTIME_VM_UNIBROW_H_
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