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Fix dependencies

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This commit is contained in:
TwinProduction
2020-12-25 03:00:08 -05:00
parent 10ab9265d9
commit 416178fb28
1449 changed files with 7770 additions and 474390 deletions
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198
vendor/golang.org/x/text/unicode/bidi/bidi.go generated vendored
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// Copyright 2015 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
//go:generate go run gen.go gen_trieval.go gen_ranges.go
// Package bidi contains functionality for bidirectional text support.
//
// See https://www.unicode.org/reports/tr9.
//
// NOTE: UNDER CONSTRUCTION. This API may change in backwards incompatible ways
// and without notice.
package bidi // import "golang.org/x/text/unicode/bidi"
// TODO:
// The following functionality would not be hard to implement, but hinges on
// the definition of a Segmenter interface. For now this is up to the user.
// - Iterate over paragraphs
// - Segmenter to iterate over runs directly from a given text.
// Also:
// - Transformer for reordering?
// - Transformer (validator, really) for Bidi Rule.
// This API tries to avoid dealing with embedding levels for now. Under the hood
// these will be computed, but the question is to which extent the user should
// know they exist. We should at some point allow the user to specify an
// embedding hierarchy, though.
// A Direction indicates the overall flow of text.
type Direction int
const (
// LeftToRight indicates the text contains no right-to-left characters and
// that either there are some left-to-right characters or the option
// DefaultDirection(LeftToRight) was passed.
LeftToRight Direction = iota
// RightToLeft indicates the text contains no left-to-right characters and
// that either there are some right-to-left characters or the option
// DefaultDirection(RightToLeft) was passed.
RightToLeft
// Mixed indicates text contains both left-to-right and right-to-left
// characters.
Mixed
// Neutral means that text contains no left-to-right and right-to-left
// characters and that no default direction has been set.
Neutral
)
type options struct{}
// An Option is an option for Bidi processing.
type Option func(*options)
// ICU allows the user to define embedding levels. This may be used, for example,
// to use hierarchical structure of markup languages to define embeddings.
// The following option may be a way to expose this functionality in this API.
// // LevelFunc sets a function that associates nesting levels with the given text.
// // The levels function will be called with monotonically increasing values for p.
// func LevelFunc(levels func(p int) int) Option {
// panic("unimplemented")
// }
// DefaultDirection sets the default direction for a Paragraph. The direction is
// overridden if the text contains directional characters.
func DefaultDirection(d Direction) Option {
panic("unimplemented")
}
// A Paragraph holds a single Paragraph for Bidi processing.
type Paragraph struct {
// buffers
}
// SetBytes configures p for the given paragraph text. It replaces text
// previously set by SetBytes or SetString. If b contains a paragraph separator
// it will only process the first paragraph and report the number of bytes
// consumed from b including this separator. Error may be non-nil if options are
// given.
func (p *Paragraph) SetBytes(b []byte, opts ...Option) (n int, err error) {
panic("unimplemented")
}
// SetString configures p for the given paragraph text. It replaces text
// previously set by SetBytes or SetString. If b contains a paragraph separator
// it will only process the first paragraph and report the number of bytes
// consumed from b including this separator. Error may be non-nil if options are
// given.
func (p *Paragraph) SetString(s string, opts ...Option) (n int, err error) {
panic("unimplemented")
}
// IsLeftToRight reports whether the principle direction of rendering for this
// paragraphs is left-to-right. If this returns false, the principle direction
// of rendering is right-to-left.
func (p *Paragraph) IsLeftToRight() bool {
panic("unimplemented")
}
// Direction returns the direction of the text of this paragraph.
//
// The direction may be LeftToRight, RightToLeft, Mixed, or Neutral.
func (p *Paragraph) Direction() Direction {
panic("unimplemented")
}
// RunAt reports the Run at the given position of the input text.
//
// This method can be used for computing line breaks on paragraphs.
func (p *Paragraph) RunAt(pos int) Run {
panic("unimplemented")
}
// Order computes the visual ordering of all the runs in a Paragraph.
func (p *Paragraph) Order() (Ordering, error) {
panic("unimplemented")
}
// Line computes the visual ordering of runs for a single line starting and
// ending at the given positions in the original text.
func (p *Paragraph) Line(start, end int) (Ordering, error) {
panic("unimplemented")
}
// An Ordering holds the computed visual order of runs of a Paragraph. Calling
// SetBytes or SetString on the originating Paragraph invalidates an Ordering.
// The methods of an Ordering should only be called by one goroutine at a time.
type Ordering struct{}
// Direction reports the directionality of the runs.
//
// The direction may be LeftToRight, RightToLeft, Mixed, or Neutral.
func (o *Ordering) Direction() Direction {
panic("unimplemented")
}
// NumRuns returns the number of runs.
func (o *Ordering) NumRuns() int {
panic("unimplemented")
}
// Run returns the ith run within the ordering.
func (o *Ordering) Run(i int) Run {
panic("unimplemented")
}
// TODO: perhaps with options.
// // Reorder creates a reader that reads the runes in visual order per character.
// // Modifiers remain after the runes they modify.
// func (l *Runs) Reorder() io.Reader {
// panic("unimplemented")
// }
// A Run is a continuous sequence of characters of a single direction.
type Run struct {
}
// String returns the text of the run in its original order.
func (r *Run) String() string {
panic("unimplemented")
}
// Bytes returns the text of the run in its original order.
func (r *Run) Bytes() []byte {
panic("unimplemented")
}
// TODO: methods for
// - Display order
// - headers and footers
// - bracket replacement.
// Direction reports the direction of the run.
func (r *Run) Direction() Direction {
panic("unimplemented")
}
// Position of the Run within the text passed to SetBytes or SetString of the
// originating Paragraph value.
func (r *Run) Pos() (start, end int) {
panic("unimplemented")
}
// AppendReverse reverses the order of characters of in, appends them to out,
// and returns the result. Modifiers will still follow the runes they modify.
// Brackets are replaced with their counterparts.
func AppendReverse(out, in []byte) []byte {
panic("unimplemented")
}
// ReverseString reverses the order of characters in s and returns a new string.
// Modifiers will still follow the runes they modify. Brackets are replaced with
// their counterparts.
func ReverseString(s string) string {
panic("unimplemented")
}

335
vendor/golang.org/x/text/unicode/bidi/bracket.go generated vendored
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// Copyright 2015 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package bidi
import (
"container/list"
"fmt"
"sort"
)
// This file contains a port of the reference implementation of the
// Bidi Parentheses Algorithm:
// https://www.unicode.org/Public/PROGRAMS/BidiReferenceJava/BidiPBAReference.java
//
// The implementation in this file covers definitions BD14-BD16 and rule N0
// of UAX#9.
//
// Some preprocessing is done for each rune before data is passed to this
// algorithm:
// - opening and closing brackets are identified
// - a bracket pair type, like '(' and ')' is assigned a unique identifier that
// is identical for the opening and closing bracket. It is left to do these
// mappings.
// - The BPA algorithm requires that bracket characters that are canonical
// equivalents of each other be able to be substituted for each other.
// It is the responsibility of the caller to do this canonicalization.
//
// In implementing BD16, this implementation departs slightly from the "logical"
// algorithm defined in UAX#9. In particular, the stack referenced there
// supports operations that go beyond a "basic" stack. An equivalent
// implementation based on a linked list is used here.
// Bidi_Paired_Bracket_Type
// BD14. An opening paired bracket is a character whose
// Bidi_Paired_Bracket_Type property value is Open.
//
// BD15. A closing paired bracket is a character whose
// Bidi_Paired_Bracket_Type property value is Close.
type bracketType byte
const (
bpNone bracketType = iota
bpOpen
bpClose
)
// bracketPair holds a pair of index values for opening and closing bracket
// location of a bracket pair.
type bracketPair struct {
opener int
closer int
}
func (b *bracketPair) String() string {
return fmt.Sprintf("(%v, %v)", b.opener, b.closer)
}
// bracketPairs is a slice of bracketPairs with a sort.Interface implementation.
type bracketPairs []bracketPair
func (b bracketPairs) Len() int { return len(b) }
func (b bracketPairs) Swap(i, j int) { b[i], b[j] = b[j], b[i] }
func (b bracketPairs) Less(i, j int) bool { return b[i].opener < b[j].opener }
// resolvePairedBrackets runs the paired bracket part of the UBA algorithm.
//
// For each rune, it takes the indexes into the original string, the class the
// bracket type (in pairTypes) and the bracket identifier (pairValues). It also
// takes the direction type for the start-of-sentence and the embedding level.
//
// The identifiers for bracket types are the rune of the canonicalized opening
// bracket for brackets (open or close) or 0 for runes that are not brackets.
func resolvePairedBrackets(s *isolatingRunSequence) {
p := bracketPairer{
sos: s.sos,
openers: list.New(),
codesIsolatedRun: s.types,
indexes: s.indexes,
}
dirEmbed := L
if s.level&1 != 0 {
dirEmbed = R
}
p.locateBrackets(s.p.pairTypes, s.p.pairValues)
p.resolveBrackets(dirEmbed, s.p.initialTypes)
}
type bracketPairer struct {
sos Class // direction corresponding to start of sequence
// The following is a restatement of BD 16 using non-algorithmic language.
//
// A bracket pair is a pair of characters consisting of an opening
// paired bracket and a closing paired bracket such that the
// Bidi_Paired_Bracket property value of the former equals the latter,
// subject to the following constraints.
// - both characters of a pair occur in the same isolating run sequence
// - the closing character of a pair follows the opening character
// - any bracket character can belong at most to one pair, the earliest possible one
// - any bracket character not part of a pair is treated like an ordinary character
// - pairs may nest properly, but their spans may not overlap otherwise
// Bracket characters with canonical decompositions are supposed to be
// treated as if they had been normalized, to allow normalized and non-
// normalized text to give the same result. In this implementation that step
// is pushed out to the caller. The caller has to ensure that the pairValue
// slices contain the rune of the opening bracket after normalization for
// any opening or closing bracket.
openers *list.List // list of positions for opening brackets
// bracket pair positions sorted by location of opening bracket
pairPositions bracketPairs
codesIsolatedRun []Class // directional bidi codes for an isolated run
indexes []int // array of index values into the original string
}
// matchOpener reports whether characters at given positions form a matching
// bracket pair.
func (p *bracketPairer) matchOpener(pairValues []rune, opener, closer int) bool {
return pairValues[p.indexes[opener]] == pairValues[p.indexes[closer]]
}
const maxPairingDepth = 63
// locateBrackets locates matching bracket pairs according to BD16.
//
// This implementation uses a linked list instead of a stack, because, while
// elements are added at the front (like a push) they are not generally removed
// in atomic 'pop' operations, reducing the benefit of the stack archetype.
func (p *bracketPairer) locateBrackets(pairTypes []bracketType, pairValues []rune) {
// traverse the run
// do that explicitly (not in a for-each) so we can record position
for i, index := range p.indexes {
// look at the bracket type for each character
if pairTypes[index] == bpNone || p.codesIsolatedRun[i] != ON {
// continue scanning
continue
}
switch pairTypes[index] {
case bpOpen:
// check if maximum pairing depth reached
if p.openers.Len() == maxPairingDepth {
p.openers.Init()
return
}
// remember opener location, most recent first
p.openers.PushFront(i)
case bpClose:
// see if there is a match
count := 0
for elem := p.openers.Front(); elem != nil; elem = elem.Next() {
count++
opener := elem.Value.(int)
if p.matchOpener(pairValues, opener, i) {
// if the opener matches, add nested pair to the ordered list
p.pairPositions = append(p.pairPositions, bracketPair{opener, i})
// remove up to and including matched opener
for ; count > 0; count-- {
p.openers.Remove(p.openers.Front())
}
break
}
}
sort.Sort(p.pairPositions)
// if we get here, the closing bracket matched no openers
// and gets ignored
}
}
}
// Bracket pairs within an isolating run sequence are processed as units so
// that both the opening and the closing paired bracket in a pair resolve to
// the same direction.
//
// N0. Process bracket pairs in an isolating run sequence sequentially in
// the logical order of the text positions of the opening paired brackets
// using the logic given below. Within this scope, bidirectional types EN
// and AN are treated as R.
//
// Identify the bracket pairs in the current isolating run sequence
// according to BD16. For each bracket-pair element in the list of pairs of
// text positions:
//
// a Inspect the bidirectional types of the characters enclosed within the
// bracket pair.
//
// b If any strong type (either L or R) matching the embedding direction is
// found, set the type for both brackets in the pair to match the embedding
// direction.
//
// o [ e ] o -> o e e e o
//
// o [ o e ] -> o e o e e
//
// o [ NI e ] -> o e NI e e
//
// c Otherwise, if a strong type (opposite the embedding direction) is
// found, test for adjacent strong types as follows: 1 First, check
// backwards before the opening paired bracket until the first strong type
// (L, R, or sos) is found. If that first preceding strong type is opposite
// the embedding direction, then set the type for both brackets in the pair
// to that type. 2 Otherwise, set the type for both brackets in the pair to
// the embedding direction.
//
// o [ o ] e -> o o o o e
//
// o [ o NI ] o -> o o o NI o o
//
// e [ o ] o -> e e o e o
//
// e [ o ] e -> e e o e e
//
// e ( o [ o ] NI ) e -> e e o o o o NI e e
//
// d Otherwise, do not set the type for the current bracket pair. Note that
// if the enclosed text contains no strong types the paired brackets will
// both resolve to the same level when resolved individually using rules N1
// and N2.
//
// e ( NI ) o -> e ( NI ) o
// getStrongTypeN0 maps character's directional code to strong type as required
// by rule N0.
//
// TODO: have separate type for "strong" directionality.
func (p *bracketPairer) getStrongTypeN0(index int) Class {
switch p.codesIsolatedRun[index] {
// in the scope of N0, number types are treated as R
case EN, AN, AL, R:
return R
case L:
return L
default:
return ON
}
}
// classifyPairContent reports the strong types contained inside a Bracket Pair,
// assuming the given embedding direction.
//
// It returns ON if no strong type is found. If a single strong type is found,
// it returns this type. Otherwise it returns the embedding direction.
//
// TODO: use separate type for "strong" directionality.
func (p *bracketPairer) classifyPairContent(loc bracketPair, dirEmbed Class) Class {
dirOpposite := ON
for i := loc.opener + 1; i < loc.closer; i++ {
dir := p.getStrongTypeN0(i)
if dir == ON {
continue
}
if dir == dirEmbed {
return dir // type matching embedding direction found
}
dirOpposite = dir
}
// return ON if no strong type found, or class opposite to dirEmbed
return dirOpposite
}
// classBeforePair determines which strong types are present before a Bracket
// Pair. Return R or L if strong type found, otherwise ON.
func (p *bracketPairer) classBeforePair(loc bracketPair) Class {
for i := loc.opener - 1; i >= 0; i-- {
if dir := p.getStrongTypeN0(i); dir != ON {
return dir
}
}
// no strong types found, return sos
return p.sos
}
// assignBracketType implements rule N0 for a single bracket pair.
func (p *bracketPairer) assignBracketType(loc bracketPair, dirEmbed Class, initialTypes []Class) {
// rule "N0, a", inspect contents of pair
dirPair := p.classifyPairContent(loc, dirEmbed)
// dirPair is now L, R, or N (no strong type found)
// the following logical tests are performed out of order compared to
// the statement of the rules but yield the same results
if dirPair == ON {
return // case "d" - nothing to do
}
if dirPair != dirEmbed {
// case "c": strong type found, opposite - check before (c.1)
dirPair = p.classBeforePair(loc)
if dirPair == dirEmbed || dirPair == ON {
// no strong opposite type found before - use embedding (c.2)
dirPair = dirEmbed
}
}
// else: case "b", strong type found matching embedding,
// no explicit action needed, as dirPair is already set to embedding
// direction
// set the bracket types to the type found
p.setBracketsToType(loc, dirPair, initialTypes)
}
func (p *bracketPairer) setBracketsToType(loc bracketPair, dirPair Class, initialTypes []Class) {
p.codesIsolatedRun[loc.opener] = dirPair
p.codesIsolatedRun[loc.closer] = dirPair
for i := loc.opener + 1; i < loc.closer; i++ {
index := p.indexes[i]
if initialTypes[index] != NSM {
break
}
p.codesIsolatedRun[i] = dirPair
}
for i := loc.closer + 1; i < len(p.indexes); i++ {
index := p.indexes[i]
if initialTypes[index] != NSM {
break
}
p.codesIsolatedRun[i] = dirPair
}
}
// resolveBrackets implements rule N0 for a list of pairs.
func (p *bracketPairer) resolveBrackets(dirEmbed Class, initialTypes []Class) {
for _, loc := range p.pairPositions {
p.assignBracketType(loc, dirEmbed, initialTypes)
}
}

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vendor/golang.org/x/text/unicode/bidi/core.go generated vendored
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vendor/golang.org/x/text/unicode/bidi/prop.go generated vendored
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// Copyright 2016 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package bidi
import "unicode/utf8"
// Properties provides access to BiDi properties of runes.
type Properties struct {
entry uint8
last uint8
}
var trie = newBidiTrie(0)
// TODO: using this for bidirule reduces the running time by about 5%. Consider
// if this is worth exposing or if we can find a way to speed up the Class
// method.
//
// // CompactClass is like Class, but maps all of the BiDi control classes
// // (LRO, RLO, LRE, RLE, PDF, LRI, RLI, FSI, PDI) to the class Control.
// func (p Properties) CompactClass() Class {
// return Class(p.entry & 0x0F)
// }
// Class returns the Bidi class for p.
func (p Properties) Class() Class {
c := Class(p.entry & 0x0F)
if c == Control {
c = controlByteToClass[p.last&0xF]
}
return c
}
// IsBracket reports whether the rune is a bracket.
func (p Properties) IsBracket() bool { return p.entry&0xF0 != 0 }
// IsOpeningBracket reports whether the rune is an opening bracket.
// IsBracket must return true.
func (p Properties) IsOpeningBracket() bool { return p.entry&openMask != 0 }
// TODO: find a better API and expose.
func (p Properties) reverseBracket(r rune) rune {
return xorMasks[p.entry>>xorMaskShift] ^ r
}
var controlByteToClass = [16]Class{
0xD: LRO, // U+202D LeftToRightOverride,
0xE: RLO, // U+202E RightToLeftOverride,
0xA: LRE, // U+202A LeftToRightEmbedding,
0xB: RLE, // U+202B RightToLeftEmbedding,
0xC: PDF, // U+202C PopDirectionalFormat,
0x6: LRI, // U+2066 LeftToRightIsolate,
0x7: RLI, // U+2067 RightToLeftIsolate,
0x8: FSI, // U+2068 FirstStrongIsolate,
0x9: PDI, // U+2069 PopDirectionalIsolate,
}
// LookupRune returns properties for r.
func LookupRune(r rune) (p Properties, size int) {
var buf [4]byte
n := utf8.EncodeRune(buf[:], r)
return Lookup(buf[:n])
}
// TODO: these lookup methods are based on the generated trie code. The returned
// sizes have slightly different semantics from the generated code, in that it
// always returns size==1 for an illegal UTF-8 byte (instead of the length
// of the maximum invalid subsequence). Most Transformers, like unicode/norm,
// leave invalid UTF-8 untouched, in which case it has performance benefits to
// do so (without changing the semantics). Bidi requires the semantics used here
// for the bidirule implementation to be compatible with the Go semantics.
// They ultimately should perhaps be adopted by all trie implementations, for
// convenience sake.
// This unrolled code also boosts performance of the secure/bidirule package by
// about 30%.
// So, to remove this code:
// - add option to trie generator to define return type.
// - always return 1 byte size for ill-formed UTF-8 runes.
// Lookup returns properties for the first rune in s and the width in bytes of
// its encoding. The size will be 0 if s does not hold enough bytes to complete
// the encoding.
func Lookup(s []byte) (p Properties, sz int) {
c0 := s[0]
switch {
case c0 < 0x80: // is ASCII
return Properties{entry: bidiValues[c0]}, 1
case c0 < 0xC2:
return Properties{}, 1
case c0 < 0xE0: // 2-byte UTF-8
if len(s) < 2 {
return Properties{}, 0
}
i := bidiIndex[c0]
c1 := s[1]
if c1 < 0x80 || 0xC0 <= c1 {
return Properties{}, 1
}
return Properties{entry: trie.lookupValue(uint32(i), c1)}, 2
case c0 < 0xF0: // 3-byte UTF-8
if len(s) < 3 {
return Properties{}, 0
}
i := bidiIndex[c0]
c1 := s[1]
if c1 < 0x80 || 0xC0 <= c1 {
return Properties{}, 1
}
o := uint32(i)<<6 + uint32(c1)
i = bidiIndex[o]
c2 := s[2]
if c2 < 0x80 || 0xC0 <= c2 {
return Properties{}, 1
}
return Properties{entry: trie.lookupValue(uint32(i), c2), last: c2}, 3
case c0 < 0xF8: // 4-byte UTF-8
if len(s) < 4 {
return Properties{}, 0
}
i := bidiIndex[c0]
c1 := s[1]
if c1 < 0x80 || 0xC0 <= c1 {
return Properties{}, 1
}
o := uint32(i)<<6 + uint32(c1)
i = bidiIndex[o]
c2 := s[2]
if c2 < 0x80 || 0xC0 <= c2 {
return Properties{}, 1
}
o = uint32(i)<<6 + uint32(c2)
i = bidiIndex[o]
c3 := s[3]
if c3 < 0x80 || 0xC0 <= c3 {
return Properties{}, 1
}
return Properties{entry: trie.lookupValue(uint32(i), c3)}, 4
}
// Illegal rune
return Properties{}, 1
}
// LookupString returns properties for the first rune in s and the width in
// bytes of its encoding. The size will be 0 if s does not hold enough bytes to
// complete the encoding.
func LookupString(s string) (p Properties, sz int) {
c0 := s[0]
switch {
case c0 < 0x80: // is ASCII
return Properties{entry: bidiValues[c0]}, 1
case c0 < 0xC2:
return Properties{}, 1
case c0 < 0xE0: // 2-byte UTF-8
if len(s) < 2 {
return Properties{}, 0
}
i := bidiIndex[c0]
c1 := s[1]
if c1 < 0x80 || 0xC0 <= c1 {
return Properties{}, 1
}
return Properties{entry: trie.lookupValue(uint32(i), c1)}, 2
case c0 < 0xF0: // 3-byte UTF-8
if len(s) < 3 {
return Properties{}, 0
}
i := bidiIndex[c0]
c1 := s[1]
if c1 < 0x80 || 0xC0 <= c1 {
return Properties{}, 1
}
o := uint32(i)<<6 + uint32(c1)
i = bidiIndex[o]
c2 := s[2]
if c2 < 0x80 || 0xC0 <= c2 {
return Properties{}, 1
}
return Properties{entry: trie.lookupValue(uint32(i), c2), last: c2}, 3
case c0 < 0xF8: // 4-byte UTF-8
if len(s) < 4 {
return Properties{}, 0
}
i := bidiIndex[c0]
c1 := s[1]
if c1 < 0x80 || 0xC0 <= c1 {
return Properties{}, 1
}
o := uint32(i)<<6 + uint32(c1)
i = bidiIndex[o]
c2 := s[2]
if c2 < 0x80 || 0xC0 <= c2 {
return Properties{}, 1
}
o = uint32(i)<<6 + uint32(c2)
i = bidiIndex[o]
c3 := s[3]
if c3 < 0x80 || 0xC0 <= c3 {
return Properties{}, 1
}
return Properties{entry: trie.lookupValue(uint32(i), c3)}, 4
}
// Illegal rune
return Properties{}, 1
}

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vendor/golang.org/x/text/unicode/bidi/tables10.0.0.go generated vendored
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vendor/golang.org/x/text/unicode/bidi/trieval.go generated vendored
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// Code generated by running "go generate" in golang.org/x/text. DO NOT EDIT.
package bidi
// Class is the Unicode BiDi class. Each rune has a single class.
type Class uint
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
Control // Control LRO - PDI
numClass
LRO // LeftToRightOverride
RLO // RightToLeftOverride
LRE // LeftToRightEmbedding
RLE // RightToLeftEmbedding
PDF // PopDirectionalFormat
LRI // LeftToRightIsolate
RLI // RightToLeftIsolate
FSI // FirstStrongIsolate
PDI // PopDirectionalIsolate
unknownClass = ^Class(0)
)
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
const (
openMask = 0x10
xorMaskShift = 5
)