dart::Utf16 Class Reference

#include <unicode.h>

Inheritance diagram for dart::Utf16:

Static Public Member Functions
static intptr_t	Length (int32_t ch)
static bool	IsSurrogate (uint32_t ch)
static bool	IsLeadSurrogate (uint32_t ch)
static bool	IsTrailSurrogate (uint32_t ch)
static int32_t	Next (const uint16_t *characters, intptr_t *i, intptr_t len)
static int32_t	Decode (uint16_t lead, uint16_t trail)
static void	Encode (int32_t codepoint, uint16_t *dst)

Static Public Attributes
static constexpr int32_t	kMaxCodeUnit = 0xFFFF
static constexpr int32_t	kLeadSurrogateStart = 0xD800
static constexpr int32_t	kLeadSurrogateEnd = 0xDBFF
static constexpr int32_t	kTrailSurrogateStart = 0xDC00
static constexpr int32_t	kTrailSurrogateEnd = 0xDFFF

Detailed Description

Definition at line 115 of file unicode.h.

Member Function Documentation

Decode()

static int32_t dart::Utf16::Decode ( uint16_t  lead, uint16_t  trail  )

inlinestatic

Definition at line 151 of file unicode.h.

                                                       {
    return 0x10000 + ((lead & 0x000003FF) << 10) + (trail & 0x3FF);
  }

Encode()

void dart::Utf16::Encode ( int32_t  codepoint, uint16_t *  dst  )

static

Definition at line 273 of file unicode.cc.

                                                   {
  ASSERT(codepoint > Utf16::kMaxCodeUnit);
  ASSERT(dst != nullptr);
  dst[0] = (Utf16::kLeadSurrogateOffset + (codepoint >> 10));
  dst[1] = (0xDC00 + (codepoint & 0x3FF));
}

IsLeadSurrogate()

static bool dart::Utf16::IsLeadSurrogate ( uint32_t  ch )

inlinestatic

Definition at line 126 of file unicode.h.

                                           {
    return (ch & 0xFFFFFC00) == 0xD800;
  }

IsSurrogate()

static bool dart::Utf16::IsSurrogate ( uint32_t  ch )

inlinestatic

Definition at line 123 of file unicode.h.

{ return (ch & 0xFFFFF800) == 0xD800; }

IsTrailSurrogate()

static bool dart::Utf16::IsTrailSurrogate ( uint32_t  ch )

inlinestatic

Definition at line 131 of file unicode.h.

                                            {
    return (ch & 0xFFFFFC00) == 0xDC00;
  }

Length()

static intptr_t dart::Utf16::Length ( int32_t  ch )

inlinestatic

Definition at line 118 of file unicode.h.

                                     {
    return (ch <= Utf16::kMaxCodeUnit) ? 1 : 2;
  }

Next()

static int32_t dart::Utf16::Next ( const uint16_t *  characters, intptr_t *  i, intptr_t  len  )

inlinestatic

Definition at line 137 of file unicode.h.

                                                                             {
    int32_t ch = LoadUnaligned(&characters[*i]);
    if (Utf16::IsLeadSurrogate(ch) && (*i < (len - 1))) {
      int32_t ch2 = LoadUnaligned(&characters[*i + 1]);
      if (Utf16::IsTrailSurrogate(ch2)) {
        ch = Utf16::Decode(ch, ch2);
        *i += 1;
      }
    }
    *i += 1;
    return ch;
  }

Member Data Documentation

kLeadSurrogateEnd

constexpr int32_t dart::Utf16::kLeadSurrogateEnd = 0xDBFF

staticconstexpr

Definition at line 160 of file unicode.h.

kLeadSurrogateStart

constexpr int32_t dart::Utf16::kLeadSurrogateStart = 0xD800

staticconstexpr

Definition at line 159 of file unicode.h.

kMaxCodeUnit

constexpr int32_t dart::Utf16::kMaxCodeUnit = 0xFFFF

staticconstexpr

Definition at line 158 of file unicode.h.

kTrailSurrogateEnd

constexpr int32_t dart::Utf16::kTrailSurrogateEnd = 0xDFFF

staticconstexpr

Definition at line 162 of file unicode.h.

kTrailSurrogateStart

constexpr int32_t dart::Utf16::kTrailSurrogateStart = 0xDC00

staticconstexpr

Definition at line 161 of file unicode.h.

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The documentation for this class was generated from the following files:

• third_party/dart-lang/sdk/runtime/platform/unicode.h
• third_party/dart-lang/sdk/runtime/platform/unicode.cc