mirror of
https://github.com/rclone/rclone.git
synced 2024-12-13 02:33:58 +01:00
252 lines
6.4 KiB
Go
252 lines
6.4 KiB
Go
|
// Copyright 2014 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 display
|
||
|
|
||
|
// This file contains common lookup code that is shared between the various
|
||
|
// implementations of Namer and Dictionaries.
|
||
|
|
||
|
import (
|
||
|
"fmt"
|
||
|
"sort"
|
||
|
"strings"
|
||
|
|
||
|
"golang.org/x/text/language"
|
||
|
)
|
||
|
|
||
|
type namer interface {
|
||
|
// name gets the string for the given index. It should walk the
|
||
|
// inheritance chain if a value is not present in the base index.
|
||
|
name(idx int) string
|
||
|
}
|
||
|
|
||
|
func nameLanguage(n namer, x interface{}) string {
|
||
|
t, _ := language.All.Compose(x)
|
||
|
for {
|
||
|
i, _, _ := langTagSet.index(t.Raw())
|
||
|
if s := n.name(i); s != "" {
|
||
|
return s
|
||
|
}
|
||
|
if t = t.Parent(); t == language.Und {
|
||
|
return ""
|
||
|
}
|
||
|
}
|
||
|
}
|
||
|
|
||
|
func nameScript(n namer, x interface{}) string {
|
||
|
t, _ := language.DeprecatedScript.Compose(x)
|
||
|
_, s, _ := t.Raw()
|
||
|
return n.name(scriptIndex.index(s.String()))
|
||
|
}
|
||
|
|
||
|
func nameRegion(n namer, x interface{}) string {
|
||
|
t, _ := language.DeprecatedRegion.Compose(x)
|
||
|
_, _, r := t.Raw()
|
||
|
return n.name(regionIndex.index(r.String()))
|
||
|
}
|
||
|
|
||
|
func nameTag(langN, scrN, regN namer, x interface{}) string {
|
||
|
t, ok := x.(language.Tag)
|
||
|
if !ok {
|
||
|
return ""
|
||
|
}
|
||
|
const form = language.All &^ language.SuppressScript
|
||
|
if c, err := form.Canonicalize(t); err == nil {
|
||
|
t = c
|
||
|
}
|
||
|
_, sRaw, rRaw := t.Raw()
|
||
|
i, scr, reg := langTagSet.index(t.Raw())
|
||
|
for i != -1 {
|
||
|
if str := langN.name(i); str != "" {
|
||
|
if hasS, hasR := (scr != language.Script{}), (reg != language.Region{}); hasS || hasR {
|
||
|
ss, sr := "", ""
|
||
|
if hasS {
|
||
|
ss = scrN.name(scriptIndex.index(scr.String()))
|
||
|
}
|
||
|
if hasR {
|
||
|
sr = regN.name(regionIndex.index(reg.String()))
|
||
|
}
|
||
|
// TODO: use patterns in CLDR or at least confirm they are the
|
||
|
// same for all languages.
|
||
|
if ss != "" && sr != "" {
|
||
|
return fmt.Sprintf("%s (%s, %s)", str, ss, sr)
|
||
|
}
|
||
|
if ss != "" || sr != "" {
|
||
|
return fmt.Sprintf("%s (%s%s)", str, ss, sr)
|
||
|
}
|
||
|
}
|
||
|
return str
|
||
|
}
|
||
|
scr, reg = sRaw, rRaw
|
||
|
if t = t.Parent(); t == language.Und {
|
||
|
return ""
|
||
|
}
|
||
|
i, _, _ = langTagSet.index(t.Raw())
|
||
|
}
|
||
|
return ""
|
||
|
}
|
||
|
|
||
|
// header contains the data and indexes for a single namer.
|
||
|
// data contains a series of strings concatenated into one. index contains the
|
||
|
// offsets for a string in data. For example, consider a header that defines
|
||
|
// strings for the languages de, el, en, fi, and nl:
|
||
|
//
|
||
|
// header{
|
||
|
// data: "GermanGreekEnglishDutch",
|
||
|
// index: []uint16{ 0, 6, 11, 18, 18, 23 },
|
||
|
// }
|
||
|
//
|
||
|
// For a language with index i, the string is defined by
|
||
|
// data[index[i]:index[i+1]]. So the number of elements in index is always one
|
||
|
// greater than the number of languages for which header defines a value.
|
||
|
// A string for a language may be empty, which means the name is undefined. In
|
||
|
// the above example, the name for fi (Finnish) is undefined.
|
||
|
type header struct {
|
||
|
data string
|
||
|
index []uint16
|
||
|
}
|
||
|
|
||
|
// name looks up the name for a tag in the dictionary, given its index.
|
||
|
func (h *header) name(i int) string {
|
||
|
if 0 <= i && i < len(h.index)-1 {
|
||
|
return h.data[h.index[i]:h.index[i+1]]
|
||
|
}
|
||
|
return ""
|
||
|
}
|
||
|
|
||
|
// tagSet is used to find the index of a language in a set of tags.
|
||
|
type tagSet struct {
|
||
|
single tagIndex
|
||
|
long []string
|
||
|
}
|
||
|
|
||
|
var (
|
||
|
langTagSet = tagSet{
|
||
|
single: langIndex,
|
||
|
long: langTagsLong,
|
||
|
}
|
||
|
|
||
|
// selfTagSet is used for indexing the language strings in their own
|
||
|
// language.
|
||
|
selfTagSet = tagSet{
|
||
|
single: selfIndex,
|
||
|
long: selfTagsLong,
|
||
|
}
|
||
|
|
||
|
zzzz = language.MustParseScript("Zzzz")
|
||
|
zz = language.MustParseRegion("ZZ")
|
||
|
)
|
||
|
|
||
|
// index returns the index of the tag for the given base, script and region or
|
||
|
// its parent if the tag is not available. If the match is for a parent entry,
|
||
|
// the excess script and region are returned.
|
||
|
func (ts *tagSet) index(base language.Base, scr language.Script, reg language.Region) (int, language.Script, language.Region) {
|
||
|
lang := base.String()
|
||
|
index := -1
|
||
|
if (scr != language.Script{} || reg != language.Region{}) {
|
||
|
if scr == zzzz {
|
||
|
scr = language.Script{}
|
||
|
}
|
||
|
if reg == zz {
|
||
|
reg = language.Region{}
|
||
|
}
|
||
|
|
||
|
i := sort.SearchStrings(ts.long, lang)
|
||
|
// All entries have either a script or a region and not both.
|
||
|
scrStr, regStr := scr.String(), reg.String()
|
||
|
for ; i < len(ts.long) && strings.HasPrefix(ts.long[i], lang); i++ {
|
||
|
if s := ts.long[i][len(lang)+1:]; s == scrStr {
|
||
|
scr = language.Script{}
|
||
|
index = i + ts.single.len()
|
||
|
break
|
||
|
} else if s == regStr {
|
||
|
reg = language.Region{}
|
||
|
index = i + ts.single.len()
|
||
|
break
|
||
|
}
|
||
|
}
|
||
|
}
|
||
|
if index == -1 {
|
||
|
index = ts.single.index(lang)
|
||
|
}
|
||
|
return index, scr, reg
|
||
|
}
|
||
|
|
||
|
func (ts *tagSet) Tags() []language.Tag {
|
||
|
tags := make([]language.Tag, 0, ts.single.len()+len(ts.long))
|
||
|
ts.single.keys(func(s string) {
|
||
|
tags = append(tags, language.Raw.MustParse(s))
|
||
|
})
|
||
|
for _, s := range ts.long {
|
||
|
tags = append(tags, language.Raw.MustParse(s))
|
||
|
}
|
||
|
return tags
|
||
|
}
|
||
|
|
||
|
func supportedScripts() []language.Script {
|
||
|
scr := make([]language.Script, 0, scriptIndex.len())
|
||
|
scriptIndex.keys(func(s string) {
|
||
|
scr = append(scr, language.MustParseScript(s))
|
||
|
})
|
||
|
return scr
|
||
|
}
|
||
|
|
||
|
func supportedRegions() []language.Region {
|
||
|
reg := make([]language.Region, 0, regionIndex.len())
|
||
|
regionIndex.keys(func(s string) {
|
||
|
reg = append(reg, language.MustParseRegion(s))
|
||
|
})
|
||
|
return reg
|
||
|
}
|
||
|
|
||
|
// tagIndex holds a concatenated lists of subtags of length 2 to 4, one string
|
||
|
// for each length, which can be used in combination with binary search to get
|
||
|
// the index associated with a tag.
|
||
|
// For example, a tagIndex{
|
||
|
// "arenesfrruzh", // 6 2-byte tags.
|
||
|
// "barwae", // 2 3-byte tags.
|
||
|
// "",
|
||
|
// }
|
||
|
// would mean that the 2-byte tag "fr" had an index of 3, and the 3-byte tag
|
||
|
// "wae" had an index of 7.
|
||
|
type tagIndex [3]string
|
||
|
|
||
|
func (t *tagIndex) index(s string) int {
|
||
|
sz := len(s)
|
||
|
if sz < 2 || 4 < sz {
|
||
|
return -1
|
||
|
}
|
||
|
a := t[sz-2]
|
||
|
index := sort.Search(len(a)/sz, func(i int) bool {
|
||
|
p := i * sz
|
||
|
return a[p:p+sz] >= s
|
||
|
})
|
||
|
p := index * sz
|
||
|
if end := p + sz; end > len(a) || a[p:end] != s {
|
||
|
return -1
|
||
|
}
|
||
|
// Add the number of tags for smaller sizes.
|
||
|
for i := 0; i < sz-2; i++ {
|
||
|
index += len(t[i]) / (i + 2)
|
||
|
}
|
||
|
return index
|
||
|
}
|
||
|
|
||
|
// len returns the number of tags that are contained in the tagIndex.
|
||
|
func (t *tagIndex) len() (n int) {
|
||
|
for i, s := range t {
|
||
|
n += len(s) / (i + 2)
|
||
|
}
|
||
|
return n
|
||
|
}
|
||
|
|
||
|
// keys calls f for each tag.
|
||
|
func (t *tagIndex) keys(f func(key string)) {
|
||
|
for i, s := range *t {
|
||
|
for ; s != ""; s = s[i+2:] {
|
||
|
f(s[:i+2])
|
||
|
}
|
||
|
}
|
||
|
}
|