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120 lines
3.0 KiB
Go
120 lines
3.0 KiB
Go
// Code generated by running "go generate" in golang.org/x/text. DO NOT EDIT.
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package idna
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// This file contains definitions for interpreting the trie value of the idna
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// trie generated by "go run gen*.go". It is shared by both the generator
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// program and the resultant package. Sharing is achieved by the generator
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// copying gen_trieval.go to trieval.go and changing what's above this comment.
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// info holds information from the IDNA mapping table for a single rune. It is
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// the value returned by a trie lookup. In most cases, all information fits in
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// a 16-bit value. For mappings, this value may contain an index into a slice
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// with the mapped string. Such mappings can consist of the actual mapped value
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// or an XOR pattern to be applied to the bytes of the UTF8 encoding of the
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// input rune. This technique is used by the cases packages and reduces the
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// table size significantly.
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//
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// The per-rune values have the following format:
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//
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// if mapped {
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// if inlinedXOR {
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// 15..13 inline XOR marker
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// 12..11 unused
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// 10..3 inline XOR mask
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// } else {
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// 15..3 index into xor or mapping table
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// }
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// } else {
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// 15..14 unused
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// 13 mayNeedNorm
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// 12..11 attributes
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// 10..8 joining type
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// 7..3 category type
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// }
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// 2 use xor pattern
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// 1..0 mapped category
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//
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// See the definitions below for a more detailed description of the various
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// bits.
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type info uint16
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const (
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catSmallMask = 0x3
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catBigMask = 0xF8
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indexShift = 3
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xorBit = 0x4 // interpret the index as an xor pattern
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inlineXOR = 0xE000 // These bits are set if the XOR pattern is inlined.
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joinShift = 8
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joinMask = 0x07
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// Attributes
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attributesMask = 0x1800
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viramaModifier = 0x1800
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modifier = 0x1000
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rtl = 0x0800
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mayNeedNorm = 0x2000
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)
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// A category corresponds to a category defined in the IDNA mapping table.
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type category uint16
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const (
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unknown category = 0 // not currently defined in unicode.
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mapped category = 1
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disallowedSTD3Mapped category = 2
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deviation category = 3
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)
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const (
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valid category = 0x08
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validNV8 category = 0x18
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validXV8 category = 0x28
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disallowed category = 0x40
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disallowedSTD3Valid category = 0x80
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ignored category = 0xC0
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)
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// join types and additional rune information
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const (
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joiningL = (iota + 1)
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joiningD
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joiningT
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joiningR
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//the following types are derived during processing
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joinZWJ
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joinZWNJ
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joinVirama
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numJoinTypes
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)
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func (c info) isMapped() bool {
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return c&0x3 != 0
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}
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func (c info) category() category {
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small := c & catSmallMask
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if small != 0 {
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return category(small)
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}
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return category(c & catBigMask)
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}
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func (c info) joinType() info {
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if c.isMapped() {
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return 0
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}
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return (c >> joinShift) & joinMask
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}
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func (c info) isModifier() bool {
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return c&(modifier|catSmallMask) == modifier
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}
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func (c info) isViramaModifier() bool {
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return c&(attributesMask|catSmallMask) == viramaModifier
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}
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