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Diffstat (limited to 'src/dma/vendor/golang.org/x/net/idna/trieval.go')
-rw-r--r--src/dma/vendor/golang.org/x/net/idna/trieval.go119
1 files changed, 119 insertions, 0 deletions
diff --git a/src/dma/vendor/golang.org/x/net/idna/trieval.go b/src/dma/vendor/golang.org/x/net/idna/trieval.go
new file mode 100644
index 00000000..7a8cf889
--- /dev/null
+++ b/src/dma/vendor/golang.org/x/net/idna/trieval.go
@@ -0,0 +1,119 @@
+// Code generated by running "go generate" in golang.org/x/text. DO NOT EDIT.
+
+package idna
+
+// This file contains definitions for interpreting the trie value of the idna
+// trie generated by "go run gen*.go". It is shared by both the generator
+// program and the resultant package. Sharing is achieved by the generator
+// copying gen_trieval.go to trieval.go and changing what's above this comment.
+
+// info holds information from the IDNA mapping table for a single rune. It is
+// the value returned by a trie lookup. In most cases, all information fits in
+// a 16-bit value. For mappings, this value may contain an index into a slice
+// with the mapped string. Such mappings can consist of the actual mapped value
+// or an XOR pattern to be applied to the bytes of the UTF8 encoding of the
+// input rune. This technique is used by the cases packages and reduces the
+// table size significantly.
+//
+// The per-rune values have the following format:
+//
+// if mapped {
+// if inlinedXOR {
+// 15..13 inline XOR marker
+// 12..11 unused
+// 10..3 inline XOR mask
+// } else {
+// 15..3 index into xor or mapping table
+// }
+// } else {
+// 15..14 unused
+// 13 mayNeedNorm
+// 12..11 attributes
+// 10..8 joining type
+// 7..3 category type
+// }
+// 2 use xor pattern
+// 1..0 mapped category
+//
+// See the definitions below for a more detailed description of the various
+// bits.
+type info uint16
+
+const (
+ catSmallMask = 0x3
+ catBigMask = 0xF8
+ indexShift = 3
+ xorBit = 0x4 // interpret the index as an xor pattern
+ inlineXOR = 0xE000 // These bits are set if the XOR pattern is inlined.
+
+ joinShift = 8
+ joinMask = 0x07
+
+ // Attributes
+ attributesMask = 0x1800
+ viramaModifier = 0x1800
+ modifier = 0x1000
+ rtl = 0x0800
+
+ mayNeedNorm = 0x2000
+)
+
+// A category corresponds to a category defined in the IDNA mapping table.
+type category uint16
+
+const (
+ unknown category = 0 // not currently defined in unicode.
+ mapped category = 1
+ disallowedSTD3Mapped category = 2
+ deviation category = 3
+)
+
+const (
+ valid category = 0x08
+ validNV8 category = 0x18
+ validXV8 category = 0x28
+ disallowed category = 0x40
+ disallowedSTD3Valid category = 0x80
+ ignored category = 0xC0
+)
+
+// join types and additional rune information
+const (
+ joiningL = (iota + 1)
+ joiningD
+ joiningT
+ joiningR
+
+ //the following types are derived during processing
+ joinZWJ
+ joinZWNJ
+ joinVirama
+ numJoinTypes
+)
+
+func (c info) isMapped() bool {
+ return c&0x3 != 0
+}
+
+func (c info) category() category {
+ small := c & catSmallMask
+ if small != 0 {
+ return category(small)
+ }
+ return category(c & catBigMask)
+}
+
+func (c info) joinType() info {
+ if c.isMapped() {
+ return 0
+ }
+ return (c >> joinShift) & joinMask
+}
+
+func (c info) isModifier() bool {
+ return c&(modifier|catSmallMask) == modifier
+}
+
+func (c info) isViramaModifier() bool {
+ return c&(attributesMask|catSmallMask) == viramaModifier
+}