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Overview ¶
Package utf8internal contains low-level utf8-related constants, tables, etc. that are used internally by the text package.
Index ¶
Constants ¶
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const ( LoCB = 0x80 // 1000 0000 HiCB = 0xBF // 1011 1111 )
The default lowest and highest continuation byte.
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const ( // ASCII identifies a UTF-8 byte as ASCII. ASCII = as // FirstInvalid indicates a byte is invalid as a first byte of a UTF-8 // sequence. FirstInvalid = xx // SizeMask is a mask for the size bits. Use use x&SizeMask to get the size. SizeMask = 7 // AcceptShift is the right-shift count for the first byte info byte to get // the index into the AcceptRanges table. See AcceptRanges. AcceptShift = 4 )
Constants related to getting information of first bytes of UTF-8 sequences.
Variables ¶
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var AcceptRanges = [...]AcceptRange{ 0: {LoCB, HiCB}, 1: {0xA0, HiCB}, 2: {LoCB, 0x9F}, 3: {0x90, HiCB}, 4: {LoCB, 0x8F}, }
AcceptRanges is a slice of AcceptRange values. For a given byte sequence b
AcceptRanges[First[b[0]]>>AcceptShift]
will give the value of AcceptRange for the multi-byte UTF-8 sequence starting at b[0].
View Source
var First = [256]uint8{}/* 256 elements not displayed */
First is information about the first byte in a UTF-8 sequence.
Functions ¶
This section is empty.
Types ¶
type AcceptRange ¶
type AcceptRange struct {
Lo uint8 // lowest value for second byte.
Hi uint8 // highest value for second byte.
}
AcceptRange gives the range of valid values for the second byte in a UTF-8 sequence for any value for First that is not ASCII or FirstInvalid.
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