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![Ryan Macnak](/assets/img/avatar_default.png)
TEST=build Change-Id: I61ebb04f414d36813a99b424fb1bcdb440f68ad5 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/293801 Commit-Queue: Ryan Macnak <rmacnak@google.com> Reviewed-by: Alexander Aprelev <aam@google.com>
256 lines
8 KiB
C++
256 lines
8 KiB
C++
// Copyright (c) 2012, 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_PLATFORM_UNICODE_H_
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#define RUNTIME_PLATFORM_UNICODE_H_
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#include "platform/allocation.h"
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#include "platform/globals.h"
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#include "platform/unaligned.h"
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namespace dart {
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class String;
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class Utf : AllStatic {
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public:
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static constexpr int32_t kMaxCodePoint = 0x10FFFF;
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static constexpr int32_t kInvalidChar = 0xFFFFFFFF;
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static constexpr int32_t kReplacementChar = 0xFFFD;
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static bool IsLatin1(int32_t code_point) {
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return (code_point >= 0) && (code_point <= 0xFF);
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}
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static bool IsBmp(int32_t code_point) {
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return (code_point >= 0) && (code_point <= 0xFFFF);
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}
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static bool IsSupplementary(int32_t code_point) {
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return (code_point > 0xFFFF) && (code_point <= kMaxCodePoint);
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}
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// Returns true if the code point value is above Plane 17.
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static bool IsOutOfRange(int32_t code_point) {
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return (code_point < 0) || (code_point > kMaxCodePoint);
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}
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};
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class Utf8 : AllStatic {
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public:
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enum Type {
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kLatin1 = 0, // Latin-1 code point [U+0000, U+00FF].
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kBMP, // Basic Multilingual Plane code point [U+0000, U+FFFF].
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kSupplementary, // Supplementary code point [U+010000, U+10FFFF].
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};
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// Returns the most restricted coding form in which the sequence of utf8
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// characters in 'utf8_array' can be represented in, and the number of
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// code units needed in that form.
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static intptr_t CodeUnitCount(const uint8_t* utf8_array,
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intptr_t array_len,
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Type* type);
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// Returns true if 'utf8_array' is a valid UTF-8 string.
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static bool IsValid(const uint8_t* utf8_array, intptr_t array_len);
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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 intptr_t 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 uint8_t* utf8_array,
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intptr_t array_len,
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int32_t* ch);
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static bool DecodeToLatin1(const uint8_t* utf8_array,
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intptr_t array_len,
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uint8_t* dst,
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intptr_t len);
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static bool DecodeToUTF16(const uint8_t* utf8_array,
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intptr_t array_len,
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uint16_t* dst,
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intptr_t len);
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static bool DecodeToUTF32(const uint8_t* utf8_array,
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intptr_t array_len,
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int32_t* dst,
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intptr_t len);
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static intptr_t ReportInvalidByte(const uint8_t* utf8_array,
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intptr_t array_len,
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intptr_t len);
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static bool DecodeCStringToUTF32(const char* str, int32_t* dst, intptr_t len);
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static constexpr int32_t kMaxOneByteChar = 0x7F;
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static constexpr int32_t kMaxTwoByteChar = 0x7FF;
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static constexpr int32_t kMaxThreeByteChar = 0xFFFF;
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static constexpr int32_t kMaxFourByteChar = Utf::kMaxCodePoint;
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private:
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static bool IsTrailByte(uint8_t code_unit) {
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return (code_unit & 0xC0) == 0x80;
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}
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static bool IsNonShortestForm(uint32_t code_point, size_t num_code_units) {
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return code_point < kOverlongMinimum[num_code_units];
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}
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static bool IsLatin1SequenceStart(uint8_t code_unit) {
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// Check if utf8 sequence is the start of a codepoint <= U+00FF
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return (code_unit <= 0xC3);
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}
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static bool IsSupplementarySequenceStart(uint8_t code_unit) {
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// Check if utf8 sequence is the start of a codepoint >= U+10000.
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return (code_unit >= 0xF0);
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}
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static const int8_t kTrailBytes[];
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static const uint32_t kMagicBits[];
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static const uint32_t kOverlongMinimum[];
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};
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class Utf16 : AllStatic {
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public:
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// Returns the length of the code point in UTF-16 code units.
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static intptr_t Length(int32_t ch) {
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return (ch <= Utf16::kMaxCodeUnit) ? 1 : 2;
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}
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// Returns true if ch is a lead or trail surrogate.
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static bool IsSurrogate(uint32_t ch) { return (ch & 0xFFFFF800) == 0xD800; }
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// Returns true if ch is a lead surrogate.
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static bool IsLeadSurrogate(uint32_t ch) {
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return (ch & 0xFFFFFC00) == 0xD800;
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}
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// Returns true if ch is a low surrogate.
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static bool IsTrailSurrogate(uint32_t ch) {
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return (ch & 0xFFFFFC00) == 0xDC00;
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}
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// Returns the character at i and advances i to the next character
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// boundary.
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static int32_t Next(const uint16_t* characters, intptr_t* i, intptr_t len) {
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int32_t ch = LoadUnaligned(&characters[*i]);
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if (Utf16::IsLeadSurrogate(ch) && (*i < (len - 1))) {
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int32_t ch2 = LoadUnaligned(&characters[*i + 1]);
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if (Utf16::IsTrailSurrogate(ch2)) {
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ch = Utf16::Decode(ch, ch2);
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*i += 1;
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}
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}
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*i += 1;
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return ch;
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}
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// Decodes a surrogate pair into a supplementary code point.
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static int32_t Decode(uint16_t lead, uint16_t trail) {
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return 0x10000 + ((lead & 0x000003FF) << 10) + (trail & 0x3FF);
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}
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// Encodes a single code point.
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static void Encode(int32_t codepoint, uint16_t* dst);
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static constexpr int32_t kMaxCodeUnit = 0xFFFF;
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static constexpr int32_t kLeadSurrogateStart = 0xD800;
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static constexpr int32_t kLeadSurrogateEnd = 0xDBFF;
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static constexpr int32_t kTrailSurrogateStart = 0xDC00;
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static constexpr int32_t kTrailSurrogateEnd = 0xDFFF;
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private:
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static constexpr int32_t kLeadSurrogateOffset = (0xD800 - (0x10000 >> 10));
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static constexpr int32_t kSurrogateOffset =
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(0x10000 - (0xD800 << 10) - 0xDC00);
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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 constexpr int32_t kUppercase = 1;
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// Property is a delta to the uppercase mapping.
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static constexpr int32_t kLowercase = 2;
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// Property is an index into the exception table.
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static constexpr int32_t kException = 3;
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// Type bit-field parameters
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static constexpr int32_t kTypeShift = 2;
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static constexpr 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 constexpr intptr_t kStage1Size = 261;
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// The size of a stage 2 block in bytes.
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static constexpr intptr_t kBlockSizeLog2 = 8;
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static constexpr intptr_t kBlockSize = 1 << kBlockSizeLog2;
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static int32_t Convert(int32_t ch, int32_t mapping) {
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if (Utf::IsLatin1(ch)) {
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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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class Latin1 {
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public:
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static constexpr int32_t kMaxChar = 0xff;
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// Convert the character to Latin-1 case equivalent if possible.
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static inline uint16_t TryConvertToLatin1(uint16_t c) {
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switch (c) {
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// This are equivalent characters in unicode.
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case 0x39c:
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case 0x3bc:
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return 0xb5;
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// This is an uppercase of a Latin-1 character
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// outside of Latin-1.
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case 0x178:
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return 0xff;
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}
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return c;
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}
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};
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} // namespace dart
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#endif // RUNTIME_PLATFORM_UNICODE_H_
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