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# dmd.utf

Functions related to UTF encoding.
Authors:
Walter Bright
License:
Boost License 1.0

Source utf.d

Documentation https://dlang.org/phobos/dmd_utf.html

Coverage https://codecov.io/gh/dlang/dmd/src/master/src/dmd/utf.d

pure nothrow @nogc bool `utf_isValidDchar`(dchar `c`);
  The Unicode code space is the range of code points [0x000000,0x10FFFF] except the UTF-16 surrogate pairs in the range [0xD800,0xDFFF]
pure nothrow @nogc bool `isUniAlpha`(dchar `c`);
  Return !=0 if unicode alpha. Use table from C99 Appendix D.
pure nothrow @nogc int `utf_codeLengthChar`(dchar `c`);
  Returns the code length of c in code units.
pure nothrow @nogc int `utf_codeLength`(int `sz`, dchar `c`);
  Returns the code length of c in code units for the encoding. sz is the encoding: 1 = utf8, 2 = utf16, 4 = utf32.
pure nothrow @nogc string `utf_decodeChar`(const(char)[] `s`, ref size_t `ridx`, out dchar `rresult`);
  Decode a UTF-8 sequence as a single UTF-32 code point.
  Parameters:

  const(char)[] `s` | UTF-8 sequence
  size_t `ridx` | starting index in s[], updated to reflect number of code units decoded
  dchar `rresult` | set to character decoded

  Returns:
  null on success, otherwise error message string
pure nothrow @nogc string `utf_decodeWchar`(const(wchar)[] `s`, ref size_t `ridx`, out dchar `rresult`);
  Decode a UTF-16 sequence as a single UTF-32 code point.
  Parameters:

  const(wchar)[] `s` | UTF-16 sequence
  size_t `ridx` | starting index in s[], updated to reflect number of code units decoded
  dchar `rresult` | set to character decoded

  Returns:
  null on success, otherwise error message string

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