/usr/share/gocode/src/golang.org/x/text/unicode/bidi/bidi.go is in golang-golang-x-text-dev 0.0~git20170627.0.6353ef0-1ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 | // 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 http://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")
}
|