cshapiro@google.com
f52039f03c
BUG=5425968 Review URL: http://codereview.chromium.org//8333001 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@616 260f80e4-7a28-3924-810f-c04153c831b5
103 lines
3.0 KiB
C++
103 lines
3.0 KiB
C++
// Copyright (c) 2011, 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 VM_UNICODE_H_
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#define VM_UNICODE_H_
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#include "vm/allocation.h"
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#include "vm/globals.h"
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namespace dart {
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class String;
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class Utf8 : AllStatic {
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public:
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static const intptr_t kMaxOneByteChar = 0x7F;
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static const intptr_t kMaxTwoByteChar = 0x7FF;
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static const intptr_t kMaxThreeByteChar = 0xFFFF;
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static const intptr_t kMaxFourByteChar = 0x10FFFF;
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static intptr_t CodePointCount(const char* str, intptr_t* width);
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static intptr_t Length(int32_t ch);
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static intptr_t Length(const String& str);
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static void Encode(int32_t ch, char* dst);
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static intptr_t Encode(const String& src, char* dst, intptr_t len);
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static intptr_t Decode(const char*, int32_t* ch);
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static bool Decode(const char* src, uint8_t* dst, intptr_t len);
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static bool Decode(const char* src, uint16_t* dst, intptr_t len);
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static bool Decode(const char* src, uint32_t* dst, intptr_t len);
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};
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class CaseMapping : AllStatic {
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public:
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// Maps a code point to uppercase.
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static int32_t ToUpper(int32_t code_point) {
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return Convert(code_point, kUppercase);
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}
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// Maps a code point to lowercase.
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static int32_t ToLower(int32_t code_point) {
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return Convert(code_point, kLowercase);
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}
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private:
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// Property is a delta to the uppercase mapping.
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static const int32_t kUppercase = 1;
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// Property is a delta to the uppercase mapping.
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static const int32_t kLowercase = 2;
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// Property is an index into the exception table.
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static const int32_t kException = 3;
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// Type bit-field parameters
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static const int32_t kTypeShift = 2;
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static const int32_t kTypeMask = 3;
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// The size of the stage 1 index.
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// TODO(cshapiro): improve indexing so this value is unnecessary.
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static const int kStage1Size = 261;
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// The size of a stage 2 block in bytes.
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static const int kBlockSizeLog2 = 8;
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static const int kBlockSize = 1 << kBlockSizeLog2;
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static int32_t Convert(int32_t ch, int32_t mapping) {
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if (ch <= 0xFF) {
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int32_t info = stage2_[ch];
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if ((info & kTypeMask) == mapping) {
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ch += info >> kTypeShift;
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}
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} else if (ch <= (kStage1Size << kBlockSizeLog2)) {
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int16_t offset = stage1_[ch >> kBlockSizeLog2] << kBlockSizeLog2;
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int32_t info = stage2_[offset + (ch & (kBlockSize - 1))];
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int32_t type = info & kTypeMask;
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if (type == mapping) {
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ch += (info >> kTypeShift);
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} else if (type == kException) {
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ch += stage2_exception_[info >> kTypeShift][mapping - 1];
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}
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}
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return ch;
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}
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// Index into the data array.
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static const uint8_t stage1_[];
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// Data for small code points with one mapping
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static const int16_t stage2_[];
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// Data for large code points or code points with both mappings.
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static const int32_t stage2_exception_[][2];
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};
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} // namespace dart
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#endif // VM_UNICODE_H_
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