Package utf8 implements functions and constants to support text encoded in UTF-8. It includes functions to translate between runes and UTF-8 byte sequences. See https://en.wikipedia.org/wiki/UTF-8
Static methods
staticinlineappendRune(_p:Slice<GoUInt8>, _r:GoInt32):Slice<GoUInt8>
AppendRune appends the UTF-8 encoding of r to the end of p and returns the extended buffer. If the rune is out of range, it appends the encoding of RuneError.
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staticinlinedecodeLastRune(_p:Slice<GoUInt8>):{_1:GoInt, _0:GoInt32}
DecodeLastRune unpacks the last UTF-8 encoding in p and returns the rune and its width in bytes. If p is empty it returns (RuneError, 0). Otherwise, if the encoding is invalid, it returns (RuneError, 1). Both are impossible results for correct, non-empty UTF-8.
An encoding is invalid if it is incorrect UTF-8, encodes a rune that is out of range, or is not the shortest possible UTF-8 encoding for the value. No other validation is performed.
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staticinlinedecodeLastRuneInString(_s:GoString):{_1:GoInt, _0:GoInt32}
DecodeLastRuneInString is like DecodeLastRune but its input is a string. If s is empty it returns (RuneError, 0). Otherwise, if the encoding is invalid, it returns (RuneError, 1). Both are impossible results for correct, non-empty UTF-8.
An encoding is invalid if it is incorrect UTF-8, encodes a rune that is out of range, or is not the shortest possible UTF-8 encoding for the value. No other validation is performed.
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staticinlinedecodeRune(_p:Slice<GoUInt8>):{_1:GoInt, _0:GoInt32}
DecodeRune unpacks the first UTF-8 encoding in p and returns the rune and its width in bytes. If p is empty it returns (RuneError, 0). Otherwise, if the encoding is invalid, it returns (RuneError, 1). Both are impossible results for correct, non-empty UTF-8.
An encoding is invalid if it is incorrect UTF-8, encodes a rune that is out of range, or is not the shortest possible UTF-8 encoding for the value. No other validation is performed.
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staticinlinedecodeRuneInString(_s:GoString):{_1:GoInt, _0:GoInt32}
DecodeRuneInString is like DecodeRune but its input is a string. If s is empty it returns (RuneError, 0). Otherwise, if the encoding is invalid, it returns (RuneError, 1). Both are impossible results for correct, non-empty UTF-8.
An encoding is invalid if it is incorrect UTF-8, encodes a rune that is out of range, or is not the shortest possible UTF-8 encoding for the value. No other validation is performed.
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staticinlineencodeRune(_p:Slice<GoUInt8>, _r:GoInt32):GoInt
EncodeRune writes into p (which must be large enough) the UTF-8 encoding of the rune. If the rune is out of range, it writes the encoding of RuneError. It returns the number of bytes written.
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staticinlinefullRune(_p:Slice<GoUInt8>):Bool
FullRune reports whether the bytes in p begin with a full UTF-8 encoding of a rune. An invalid encoding is considered a full Rune since it will convert as a width-1 error rune.
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staticinlinefullRuneInString(_s:GoString):Bool
FullRuneInString is like FullRune but its input is a string.
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staticinlineruneCount(_p:Slice<GoUInt8>):GoInt
RuneCount returns the number of runes in p. Erroneous and short encodings are treated as single runes of width 1 byte.
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staticinlineruneCountInString(_s:GoString):GoInt
RuneCountInString is like RuneCount but its input is a string.
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staticinlineruneLen(_r:GoInt32):GoInt
RuneLen returns the number of bytes required to encode the rune. It returns -1 if the rune is not a valid value to encode in UTF-8.
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staticinlineruneStart(_b:GoUInt8):Bool
RuneStart reports whether the byte could be the first byte of an encoded, possibly invalid rune. Second and subsequent bytes always have the top two bits set to 10.
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staticinlinevalid(_p:Slice<GoUInt8>):Bool
Valid reports whether p consists entirely of valid UTF-8-encoded runes.
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staticinlinevalidRune(_r:GoInt32):Bool
ValidRune reports whether r can be legally encoded as UTF-8. Code points that are out of range or a surrogate half are illegal.
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staticinlinevalidString(_s:GoString):Bool
ValidString reports whether s consists entirely of valid UTF-8-encoded runes.
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