1 // Code generated by running "go generate" in golang.org/x/text. DO NOT EDIT.
5 // This file contains definitions for interpreting the trie value of the idna
6 // trie generated by "go run gen*.go". It is shared by both the generator
7 // program and the resultant package. Sharing is achieved by the generator
8 // copying gen_trieval.go to trieval.go and changing what's above this comment.
10 // info holds information from the IDNA mapping table for a single rune. It is
11 // the value returned by a trie lookup. In most cases, all information fits in
12 // a 16-bit value. For mappings, this value may contain an index into a slice
13 // with the mapped string. Such mappings can consist of the actual mapped value
14 // or an XOR pattern to be applied to the bytes of the UTF8 encoding of the
15 // input rune. This technique is used by the cases packages and reduces the
16 // table size significantly.
18 // The per-rune values have the following format:
22 // 15..13 inline XOR marker
24 // 10..3 inline XOR mask
26 // 15..3 index into xor or mapping table
36 // 1..0 mapped category
38 // See the definitions below for a more detailed description of the various
46 xorBit = 0x4 // interpret the index as an xor pattern
47 inlineXOR = 0xE000 // These bits are set if the XOR pattern is inlined.
53 attributesMask = 0x1800
54 viramaModifier = 0x1800
61 // A category corresponds to a category defined in the IDNA mapping table.
65 unknown category = 0 // not currently defined in unicode.
67 disallowedSTD3Mapped category = 2
68 deviation category = 3
73 validNV8 category = 0x18
74 validXV8 category = 0x28
75 disallowed category = 0x40
76 disallowedSTD3Valid category = 0x80
77 ignored category = 0xC0
80 // join types and additional rune information
87 //the following types are derived during processing
94 func (c info) isMapped() bool {
98 func (c info) category() category {
99 small := c & catSmallMask
101 return category(small)
103 return category(c & catBigMask)
106 func (c info) joinType() info {
110 return (c >> joinShift) & joinMask
113 func (c info) isModifier() bool {
114 return c&(modifier|catSmallMask) == modifier
117 func (c info) isViramaModifier() bool {
118 return c&(attributesMask|catSmallMask) == viramaModifier