| // This file was generated by go generate; DO NOT EDIT |
| |
| package bidi |
| |
| type class int |
| |
| const ( |
| _L class = iota // LeftToRight |
| _R // RightToLeft |
| _EN // EuropeanNumber |
| _ES // EuropeanSeparator |
| _ET // EuropeanTerminator |
| _AN // ArabicNumber |
| _CS // CommonSeparator |
| _B // ParagraphSeparator |
| _S // SegmentSeparator |
| _WS // WhiteSpace |
| _ON // OtherNeutral |
| _BN // BoundaryNeutral |
| _NSM // NonspacingMark |
| _AL // ArabicLetter |
| classControl // Control LRO - PDI |
| |
| numClass |
| |
| _LRO // LeftToRightOverride |
| _RLO // RightToLeftOverride |
| _LRE // LeftToRightEmbedding |
| _RLE // RightToLeftEmbedding |
| _PDF // PopDirectionalFormat |
| _LRI // LeftToRightIsolate |
| _RLI // RightToLeftIsolate |
| _FSI // FirstStrongIsolate |
| _PDI // PopDirectionalIsolate |
| ) |
| |
| var controlToClass = map[rune]class{ |
| 0x202D: _LRO, // LeftToRightOverride, |
| 0x202E: _RLO, // RightToLeftOverride, |
| 0x202A: _LRE, // LeftToRightEmbedding, |
| 0x202B: _RLE, // RightToLeftEmbedding, |
| 0x202C: _PDF, // PopDirectionalFormat, |
| 0x2066: _LRI, // LeftToRightIsolate, |
| 0x2067: _RLI, // RightToLeftIsolate, |
| 0x2068: _FSI, // FirstStrongIsolate, |
| 0x2069: _PDI, // PopDirectionalIsolate, |
| } |
| |
| // A trie entry has the following bits: |
| // 7..5 XOR mask for brackets |
| // 4 1: Bracket open, 0: Bracket close |
| // 3..0 class type |
| type entry uint8 |
| |
| const ( |
| openMask = 0x10 |
| xorMaskShift = 5 |
| ) |
| |
| func (e entry) isBracket() bool { return e&0xF0 != 0 } |
| func (e entry) isOpen() bool { return e&openMask != 0 } |
| func (e entry) reverseBracket(r rune) rune { return xorMasks[e>>xorMaskShift] ^ r } |
| func (e entry) class(r rune) class { |
| c := class(e & 0x0F) |
| if c == classControl { |
| return controlToClass[r] |
| } |
| return c |
| } |
