mirror of
https://github.com/Luzifer/vault-otp-ui.git
synced 2024-11-14 02:52:45 +00:00
403 lines
9.4 KiB
Go
403 lines
9.4 KiB
Go
// Copyright 2012 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.
|
|
|
|
// TODO: remove hard-coded versions when we have implemented fractional weights.
|
|
// The current implementation is incompatible with later CLDR versions.
|
|
//go:generate go run maketables.go -cldr=23 -unicode=6.2.0
|
|
|
|
// Package collate contains types for comparing and sorting Unicode strings
|
|
// according to a given collation order.
|
|
package collate // import "golang.org/x/text/collate"
|
|
|
|
import (
|
|
"bytes"
|
|
"strings"
|
|
|
|
"golang.org/x/text/internal/colltab"
|
|
"golang.org/x/text/language"
|
|
)
|
|
|
|
// Collator provides functionality for comparing strings for a given
|
|
// collation order.
|
|
type Collator struct {
|
|
options
|
|
|
|
sorter sorter
|
|
|
|
_iter [2]iter
|
|
}
|
|
|
|
func (c *Collator) iter(i int) *iter {
|
|
// TODO: evaluate performance for making the second iterator optional.
|
|
return &c._iter[i]
|
|
}
|
|
|
|
// Supported returns the list of languages for which collating differs from its parent.
|
|
func Supported() []language.Tag {
|
|
// TODO: use language.Coverage instead.
|
|
|
|
t := make([]language.Tag, len(tags))
|
|
copy(t, tags)
|
|
return t
|
|
}
|
|
|
|
func init() {
|
|
ids := strings.Split(availableLocales, ",")
|
|
tags = make([]language.Tag, len(ids))
|
|
for i, s := range ids {
|
|
tags[i] = language.Raw.MustParse(s)
|
|
}
|
|
}
|
|
|
|
var tags []language.Tag
|
|
|
|
// New returns a new Collator initialized for the given locale.
|
|
func New(t language.Tag, o ...Option) *Collator {
|
|
index := colltab.MatchLang(t, tags)
|
|
c := newCollator(getTable(locales[index]))
|
|
|
|
// Set options from the user-supplied tag.
|
|
c.setFromTag(t)
|
|
|
|
// Set the user-supplied options.
|
|
c.setOptions(o)
|
|
|
|
c.init()
|
|
return c
|
|
}
|
|
|
|
// NewFromTable returns a new Collator for the given Weighter.
|
|
func NewFromTable(w colltab.Weighter, o ...Option) *Collator {
|
|
c := newCollator(w)
|
|
c.setOptions(o)
|
|
c.init()
|
|
return c
|
|
}
|
|
|
|
func (c *Collator) init() {
|
|
if c.numeric {
|
|
c.t = colltab.NewNumericWeighter(c.t)
|
|
}
|
|
c._iter[0].init(c)
|
|
c._iter[1].init(c)
|
|
}
|
|
|
|
// Buffer holds keys generated by Key and KeyString.
|
|
type Buffer struct {
|
|
buf [4096]byte
|
|
key []byte
|
|
}
|
|
|
|
func (b *Buffer) init() {
|
|
if b.key == nil {
|
|
b.key = b.buf[:0]
|
|
}
|
|
}
|
|
|
|
// Reset clears the buffer from previous results generated by Key and KeyString.
|
|
func (b *Buffer) Reset() {
|
|
b.key = b.key[:0]
|
|
}
|
|
|
|
// Compare returns an integer comparing the two byte slices.
|
|
// The result will be 0 if a==b, -1 if a < b, and +1 if a > b.
|
|
func (c *Collator) Compare(a, b []byte) int {
|
|
// TODO: skip identical prefixes once we have a fast way to detect if a rune is
|
|
// part of a contraction. This would lead to roughly a 10% speedup for the colcmp regtest.
|
|
c.iter(0).SetInput(a)
|
|
c.iter(1).SetInput(b)
|
|
if res := c.compare(); res != 0 {
|
|
return res
|
|
}
|
|
if !c.ignore[colltab.Identity] {
|
|
return bytes.Compare(a, b)
|
|
}
|
|
return 0
|
|
}
|
|
|
|
// CompareString returns an integer comparing the two strings.
|
|
// The result will be 0 if a==b, -1 if a < b, and +1 if a > b.
|
|
func (c *Collator) CompareString(a, b string) int {
|
|
// TODO: skip identical prefixes once we have a fast way to detect if a rune is
|
|
// part of a contraction. This would lead to roughly a 10% speedup for the colcmp regtest.
|
|
c.iter(0).SetInputString(a)
|
|
c.iter(1).SetInputString(b)
|
|
if res := c.compare(); res != 0 {
|
|
return res
|
|
}
|
|
if !c.ignore[colltab.Identity] {
|
|
if a < b {
|
|
return -1
|
|
} else if a > b {
|
|
return 1
|
|
}
|
|
}
|
|
return 0
|
|
}
|
|
|
|
func compareLevel(f func(i *iter) int, a, b *iter) int {
|
|
a.pce = 0
|
|
b.pce = 0
|
|
for {
|
|
va := f(a)
|
|
vb := f(b)
|
|
if va != vb {
|
|
if va < vb {
|
|
return -1
|
|
}
|
|
return 1
|
|
} else if va == 0 {
|
|
break
|
|
}
|
|
}
|
|
return 0
|
|
}
|
|
|
|
func (c *Collator) compare() int {
|
|
ia, ib := c.iter(0), c.iter(1)
|
|
// Process primary level
|
|
if c.alternate != altShifted {
|
|
// TODO: implement script reordering
|
|
if res := compareLevel((*iter).nextPrimary, ia, ib); res != 0 {
|
|
return res
|
|
}
|
|
} else {
|
|
// TODO: handle shifted
|
|
}
|
|
if !c.ignore[colltab.Secondary] {
|
|
f := (*iter).nextSecondary
|
|
if c.backwards {
|
|
f = (*iter).prevSecondary
|
|
}
|
|
if res := compareLevel(f, ia, ib); res != 0 {
|
|
return res
|
|
}
|
|
}
|
|
// TODO: special case handling (Danish?)
|
|
if !c.ignore[colltab.Tertiary] || c.caseLevel {
|
|
if res := compareLevel((*iter).nextTertiary, ia, ib); res != 0 {
|
|
return res
|
|
}
|
|
if !c.ignore[colltab.Quaternary] {
|
|
if res := compareLevel((*iter).nextQuaternary, ia, ib); res != 0 {
|
|
return res
|
|
}
|
|
}
|
|
}
|
|
return 0
|
|
}
|
|
|
|
// Key returns the collation key for str.
|
|
// Passing the buffer buf may avoid memory allocations.
|
|
// The returned slice will point to an allocation in Buffer and will remain
|
|
// valid until the next call to buf.Reset().
|
|
func (c *Collator) Key(buf *Buffer, str []byte) []byte {
|
|
// See http://www.unicode.org/reports/tr10/#Main_Algorithm for more details.
|
|
buf.init()
|
|
return c.key(buf, c.getColElems(str))
|
|
}
|
|
|
|
// KeyFromString returns the collation key for str.
|
|
// Passing the buffer buf may avoid memory allocations.
|
|
// The returned slice will point to an allocation in Buffer and will retain
|
|
// valid until the next call to buf.ResetKeys().
|
|
func (c *Collator) KeyFromString(buf *Buffer, str string) []byte {
|
|
// See http://www.unicode.org/reports/tr10/#Main_Algorithm for more details.
|
|
buf.init()
|
|
return c.key(buf, c.getColElemsString(str))
|
|
}
|
|
|
|
func (c *Collator) key(buf *Buffer, w []colltab.Elem) []byte {
|
|
processWeights(c.alternate, c.t.Top(), w)
|
|
kn := len(buf.key)
|
|
c.keyFromElems(buf, w)
|
|
return buf.key[kn:]
|
|
}
|
|
|
|
func (c *Collator) getColElems(str []byte) []colltab.Elem {
|
|
i := c.iter(0)
|
|
i.SetInput(str)
|
|
for i.Next() {
|
|
}
|
|
return i.Elems
|
|
}
|
|
|
|
func (c *Collator) getColElemsString(str string) []colltab.Elem {
|
|
i := c.iter(0)
|
|
i.SetInputString(str)
|
|
for i.Next() {
|
|
}
|
|
return i.Elems
|
|
}
|
|
|
|
type iter struct {
|
|
wa [512]colltab.Elem
|
|
|
|
colltab.Iter
|
|
pce int
|
|
}
|
|
|
|
func (i *iter) init(c *Collator) {
|
|
i.Weighter = c.t
|
|
i.Elems = i.wa[:0]
|
|
}
|
|
|
|
func (i *iter) nextPrimary() int {
|
|
for {
|
|
for ; i.pce < i.N; i.pce++ {
|
|
if v := i.Elems[i.pce].Primary(); v != 0 {
|
|
i.pce++
|
|
return v
|
|
}
|
|
}
|
|
if !i.Next() {
|
|
return 0
|
|
}
|
|
}
|
|
panic("should not reach here")
|
|
}
|
|
|
|
func (i *iter) nextSecondary() int {
|
|
for ; i.pce < len(i.Elems); i.pce++ {
|
|
if v := i.Elems[i.pce].Secondary(); v != 0 {
|
|
i.pce++
|
|
return v
|
|
}
|
|
}
|
|
return 0
|
|
}
|
|
|
|
func (i *iter) prevSecondary() int {
|
|
for ; i.pce < len(i.Elems); i.pce++ {
|
|
if v := i.Elems[len(i.Elems)-i.pce-1].Secondary(); v != 0 {
|
|
i.pce++
|
|
return v
|
|
}
|
|
}
|
|
return 0
|
|
}
|
|
|
|
func (i *iter) nextTertiary() int {
|
|
for ; i.pce < len(i.Elems); i.pce++ {
|
|
if v := i.Elems[i.pce].Tertiary(); v != 0 {
|
|
i.pce++
|
|
return int(v)
|
|
}
|
|
}
|
|
return 0
|
|
}
|
|
|
|
func (i *iter) nextQuaternary() int {
|
|
for ; i.pce < len(i.Elems); i.pce++ {
|
|
if v := i.Elems[i.pce].Quaternary(); v != 0 {
|
|
i.pce++
|
|
return v
|
|
}
|
|
}
|
|
return 0
|
|
}
|
|
|
|
func appendPrimary(key []byte, p int) []byte {
|
|
// Convert to variable length encoding; supports up to 23 bits.
|
|
if p <= 0x7FFF {
|
|
key = append(key, uint8(p>>8), uint8(p))
|
|
} else {
|
|
key = append(key, uint8(p>>16)|0x80, uint8(p>>8), uint8(p))
|
|
}
|
|
return key
|
|
}
|
|
|
|
// keyFromElems converts the weights ws to a compact sequence of bytes.
|
|
// The result will be appended to the byte buffer in buf.
|
|
func (c *Collator) keyFromElems(buf *Buffer, ws []colltab.Elem) {
|
|
for _, v := range ws {
|
|
if w := v.Primary(); w > 0 {
|
|
buf.key = appendPrimary(buf.key, w)
|
|
}
|
|
}
|
|
if !c.ignore[colltab.Secondary] {
|
|
buf.key = append(buf.key, 0, 0)
|
|
// TODO: we can use one 0 if we can guarantee that all non-zero weights are > 0xFF.
|
|
if !c.backwards {
|
|
for _, v := range ws {
|
|
if w := v.Secondary(); w > 0 {
|
|
buf.key = append(buf.key, uint8(w>>8), uint8(w))
|
|
}
|
|
}
|
|
} else {
|
|
for i := len(ws) - 1; i >= 0; i-- {
|
|
if w := ws[i].Secondary(); w > 0 {
|
|
buf.key = append(buf.key, uint8(w>>8), uint8(w))
|
|
}
|
|
}
|
|
}
|
|
} else if c.caseLevel {
|
|
buf.key = append(buf.key, 0, 0)
|
|
}
|
|
if !c.ignore[colltab.Tertiary] || c.caseLevel {
|
|
buf.key = append(buf.key, 0, 0)
|
|
for _, v := range ws {
|
|
if w := v.Tertiary(); w > 0 {
|
|
buf.key = append(buf.key, uint8(w))
|
|
}
|
|
}
|
|
// Derive the quaternary weights from the options and other levels.
|
|
// Note that we represent MaxQuaternary as 0xFF. The first byte of the
|
|
// representation of a primary weight is always smaller than 0xFF,
|
|
// so using this single byte value will compare correctly.
|
|
if !c.ignore[colltab.Quaternary] && c.alternate >= altShifted {
|
|
if c.alternate == altShiftTrimmed {
|
|
lastNonFFFF := len(buf.key)
|
|
buf.key = append(buf.key, 0)
|
|
for _, v := range ws {
|
|
if w := v.Quaternary(); w == colltab.MaxQuaternary {
|
|
buf.key = append(buf.key, 0xFF)
|
|
} else if w > 0 {
|
|
buf.key = appendPrimary(buf.key, w)
|
|
lastNonFFFF = len(buf.key)
|
|
}
|
|
}
|
|
buf.key = buf.key[:lastNonFFFF]
|
|
} else {
|
|
buf.key = append(buf.key, 0)
|
|
for _, v := range ws {
|
|
if w := v.Quaternary(); w == colltab.MaxQuaternary {
|
|
buf.key = append(buf.key, 0xFF)
|
|
} else if w > 0 {
|
|
buf.key = appendPrimary(buf.key, w)
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
func processWeights(vw alternateHandling, top uint32, wa []colltab.Elem) {
|
|
ignore := false
|
|
vtop := int(top)
|
|
switch vw {
|
|
case altShifted, altShiftTrimmed:
|
|
for i := range wa {
|
|
if p := wa[i].Primary(); p <= vtop && p != 0 {
|
|
wa[i] = colltab.MakeQuaternary(p)
|
|
ignore = true
|
|
} else if p == 0 {
|
|
if ignore {
|
|
wa[i] = colltab.Ignore
|
|
}
|
|
} else {
|
|
ignore = false
|
|
}
|
|
}
|
|
case altBlanked:
|
|
for i := range wa {
|
|
if p := wa[i].Primary(); p <= vtop && (ignore || p != 0) {
|
|
wa[i] = colltab.Ignore
|
|
ignore = true
|
|
} else {
|
|
ignore = false
|
|
}
|
|
}
|
|
}
|
|
}
|