vendor/golang.org/x/text/unicode/bidi/gen_trieval.go

   1 // Copyright 2015 The Go Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style
   3 // license that can be found in the LICENSE file.
   4
   5 // +build ignore
   6
   7 package main
   8
   9 // Class is the Unicode BiDi class. Each rune has a single class.
  10 type Class uint
  11
  12 const (
  13         L       Class = iota // LeftToRight
  14         R                    // RightToLeft
  15         EN                   // EuropeanNumber
  16         ES                   // EuropeanSeparator
  17         ET                   // EuropeanTerminator
  18         AN                   // ArabicNumber
  19         CS                   // CommonSeparator
  20         B                    // ParagraphSeparator
  21         S                    // SegmentSeparator
  22         WS                   // WhiteSpace
  23         ON                   // OtherNeutral
  24         BN                   // BoundaryNeutral
  25         NSM                  // NonspacingMark
  26         AL                   // ArabicLetter
  27         Control              // Control LRO - PDI
  28
  29         numClass
  30
  31         LRO // LeftToRightOverride
  32         RLO // RightToLeftOverride
  33         LRE // LeftToRightEmbedding
  34         RLE // RightToLeftEmbedding
  35         PDF // PopDirectionalFormat
  36         LRI // LeftToRightIsolate
  37         RLI // RightToLeftIsolate
  38         FSI // FirstStrongIsolate
  39         PDI // PopDirectionalIsolate
  40
  41         unknownClass = ^Class(0)
  42 )
  43
  44 var controlToClass = map[rune]Class{
  45         0x202D: LRO, // LeftToRightOverride,
  46         0x202E: RLO, // RightToLeftOverride,
  47         0x202A: LRE, // LeftToRightEmbedding,
  48         0x202B: RLE, // RightToLeftEmbedding,
  49         0x202C: PDF, // PopDirectionalFormat,
  50         0x2066: LRI, // LeftToRightIsolate,
  51         0x2067: RLI, // RightToLeftIsolate,
  52         0x2068: FSI, // FirstStrongIsolate,
  53         0x2069: PDI, // PopDirectionalIsolate,
  54 }
  55
  56 // A trie entry has the following bits:
  57 // 7..5  XOR mask for brackets
  58 // 4     1: Bracket open, 0: Bracket close
  59 // 3..0  Class type
  60
  61 const (
  62         openMask     = 0x10
  63         xorMaskShift = 5
  64 )