+++ /dev/null
-// Copyright 2013 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 language
-
-import (
- "bytes"
- "fmt"
- "sort"
- "strconv"
-
- "golang.org/x/text/internal/tag"
-)
-
-// findIndex tries to find the given tag in idx and returns a standardized error
-// if it could not be found.
-func findIndex(idx tag.Index, key []byte, form string) (index int, err error) {
- if !tag.FixCase(form, key) {
- return 0, errSyntax
- }
- i := idx.Index(key)
- if i == -1 {
- return 0, mkErrInvalid(key)
- }
- return i, nil
-}
-
-func searchUint(imap []uint16, key uint16) int {
- return sort.Search(len(imap), func(i int) bool {
- return imap[i] >= key
- })
-}
-
-type langID uint16
-
-// getLangID returns the langID of s if s is a canonical subtag
-// or langUnknown if s is not a canonical subtag.
-func getLangID(s []byte) (langID, error) {
- if len(s) == 2 {
- return getLangISO2(s)
- }
- return getLangISO3(s)
-}
-
-// mapLang returns the mapped langID of id according to mapping m.
-func normLang(id langID) (langID, langAliasType) {
- k := sort.Search(len(langAliasMap), func(i int) bool {
- return langAliasMap[i].from >= uint16(id)
- })
- if k < len(langAliasMap) && langAliasMap[k].from == uint16(id) {
- return langID(langAliasMap[k].to), langAliasTypes[k]
- }
- return id, langAliasTypeUnknown
-}
-
-// getLangISO2 returns the langID for the given 2-letter ISO language code
-// or unknownLang if this does not exist.
-func getLangISO2(s []byte) (langID, error) {
- if !tag.FixCase("zz", s) {
- return 0, errSyntax
- }
- if i := lang.Index(s); i != -1 && lang.Elem(i)[3] != 0 {
- return langID(i), nil
- }
- return 0, mkErrInvalid(s)
-}
-
-const base = 'z' - 'a' + 1
-
-func strToInt(s []byte) uint {
- v := uint(0)
- for i := 0; i < len(s); i++ {
- v *= base
- v += uint(s[i] - 'a')
- }
- return v
-}
-
-// converts the given integer to the original ASCII string passed to strToInt.
-// len(s) must match the number of characters obtained.
-func intToStr(v uint, s []byte) {
- for i := len(s) - 1; i >= 0; i-- {
- s[i] = byte(v%base) + 'a'
- v /= base
- }
-}
-
-// getLangISO3 returns the langID for the given 3-letter ISO language code
-// or unknownLang if this does not exist.
-func getLangISO3(s []byte) (langID, error) {
- if tag.FixCase("und", s) {
- // first try to match canonical 3-letter entries
- for i := lang.Index(s[:2]); i != -1; i = lang.Next(s[:2], i) {
- if e := lang.Elem(i); e[3] == 0 && e[2] == s[2] {
- // We treat "und" as special and always translate it to "unspecified".
- // Note that ZZ and Zzzz are private use and are not treated as
- // unspecified by default.
- id := langID(i)
- if id == nonCanonicalUnd {
- return 0, nil
- }
- return id, nil
- }
- }
- if i := altLangISO3.Index(s); i != -1 {
- return langID(altLangIndex[altLangISO3.Elem(i)[3]]), nil
- }
- n := strToInt(s)
- if langNoIndex[n/8]&(1<<(n%8)) != 0 {
- return langID(n) + langNoIndexOffset, nil
- }
- // Check for non-canonical uses of ISO3.
- for i := lang.Index(s[:1]); i != -1; i = lang.Next(s[:1], i) {
- if e := lang.Elem(i); e[2] == s[1] && e[3] == s[2] {
- return langID(i), nil
- }
- }
- return 0, mkErrInvalid(s)
- }
- return 0, errSyntax
-}
-
-// stringToBuf writes the string to b and returns the number of bytes
-// written. cap(b) must be >= 3.
-func (id langID) stringToBuf(b []byte) int {
- if id >= langNoIndexOffset {
- intToStr(uint(id)-langNoIndexOffset, b[:3])
- return 3
- } else if id == 0 {
- return copy(b, "und")
- }
- l := lang[id<<2:]
- if l[3] == 0 {
- return copy(b, l[:3])
- }
- return copy(b, l[:2])
-}
-
-// String returns the BCP 47 representation of the langID.
-// Use b as variable name, instead of id, to ensure the variable
-// used is consistent with that of Base in which this type is embedded.
-func (b langID) String() string {
- if b == 0 {
- return "und"
- } else if b >= langNoIndexOffset {
- b -= langNoIndexOffset
- buf := [3]byte{}
- intToStr(uint(b), buf[:])
- return string(buf[:])
- }
- l := lang.Elem(int(b))
- if l[3] == 0 {
- return l[:3]
- }
- return l[:2]
-}
-
-// ISO3 returns the ISO 639-3 language code.
-func (b langID) ISO3() string {
- if b == 0 || b >= langNoIndexOffset {
- return b.String()
- }
- l := lang.Elem(int(b))
- if l[3] == 0 {
- return l[:3]
- } else if l[2] == 0 {
- return altLangISO3.Elem(int(l[3]))[:3]
- }
- // This allocation will only happen for 3-letter ISO codes
- // that are non-canonical BCP 47 language identifiers.
- return l[0:1] + l[2:4]
-}
-
-// IsPrivateUse reports whether this language code is reserved for private use.
-func (b langID) IsPrivateUse() bool {
- return langPrivateStart <= b && b <= langPrivateEnd
-}
-
-type regionID uint16
-
-// getRegionID returns the region id for s if s is a valid 2-letter region code
-// or unknownRegion.
-func getRegionID(s []byte) (regionID, error) {
- if len(s) == 3 {
- if isAlpha(s[0]) {
- return getRegionISO3(s)
- }
- if i, err := strconv.ParseUint(string(s), 10, 10); err == nil {
- return getRegionM49(int(i))
- }
- }
- return getRegionISO2(s)
-}
-
-// getRegionISO2 returns the regionID for the given 2-letter ISO country code
-// or unknownRegion if this does not exist.
-func getRegionISO2(s []byte) (regionID, error) {
- i, err := findIndex(regionISO, s, "ZZ")
- if err != nil {
- return 0, err
- }
- return regionID(i) + isoRegionOffset, nil
-}
-
-// getRegionISO3 returns the regionID for the given 3-letter ISO country code
-// or unknownRegion if this does not exist.
-func getRegionISO3(s []byte) (regionID, error) {
- if tag.FixCase("ZZZ", s) {
- for i := regionISO.Index(s[:1]); i != -1; i = regionISO.Next(s[:1], i) {
- if e := regionISO.Elem(i); e[2] == s[1] && e[3] == s[2] {
- return regionID(i) + isoRegionOffset, nil
- }
- }
- for i := 0; i < len(altRegionISO3); i += 3 {
- if tag.Compare(altRegionISO3[i:i+3], s) == 0 {
- return regionID(altRegionIDs[i/3]), nil
- }
- }
- return 0, mkErrInvalid(s)
- }
- return 0, errSyntax
-}
-
-func getRegionM49(n int) (regionID, error) {
- if 0 < n && n <= 999 {
- const (
- searchBits = 7
- regionBits = 9
- regionMask = 1<<regionBits - 1
- )
- idx := n >> searchBits
- buf := fromM49[m49Index[idx]:m49Index[idx+1]]
- val := uint16(n) << regionBits // we rely on bits shifting out
- i := sort.Search(len(buf), func(i int) bool {
- return buf[i] >= val
- })
- if r := fromM49[int(m49Index[idx])+i]; r&^regionMask == val {
- return regionID(r & regionMask), nil
- }
- }
- var e ValueError
- fmt.Fprint(bytes.NewBuffer([]byte(e.v[:])), n)
- return 0, e
-}
-
-// normRegion returns a region if r is deprecated or 0 otherwise.
-// TODO: consider supporting BYS (-> BLR), CSK (-> 200 or CZ), PHI (-> PHL) and AFI (-> DJ).
-// TODO: consider mapping split up regions to new most populous one (like CLDR).
-func normRegion(r regionID) regionID {
- m := regionOldMap
- k := sort.Search(len(m), func(i int) bool {
- return m[i].from >= uint16(r)
- })
- if k < len(m) && m[k].from == uint16(r) {
- return regionID(m[k].to)
- }
- return 0
-}
-
-const (
- iso3166UserAssigned = 1 << iota
- ccTLD
- bcp47Region
-)
-
-func (r regionID) typ() byte {
- return regionTypes[r]
-}
-
-// String returns the BCP 47 representation for the region.
-// It returns "ZZ" for an unspecified region.
-func (r regionID) String() string {
- if r < isoRegionOffset {
- if r == 0 {
- return "ZZ"
- }
- return fmt.Sprintf("%03d", r.M49())
- }
- r -= isoRegionOffset
- return regionISO.Elem(int(r))[:2]
-}
-
-// ISO3 returns the 3-letter ISO code of r.
-// Note that not all regions have a 3-letter ISO code.
-// In such cases this method returns "ZZZ".
-func (r regionID) ISO3() string {
- if r < isoRegionOffset {
- return "ZZZ"
- }
- r -= isoRegionOffset
- reg := regionISO.Elem(int(r))
- switch reg[2] {
- case 0:
- return altRegionISO3[reg[3]:][:3]
- case ' ':
- return "ZZZ"
- }
- return reg[0:1] + reg[2:4]
-}
-
-// M49 returns the UN M.49 encoding of r, or 0 if this encoding
-// is not defined for r.
-func (r regionID) M49() int {
- return int(m49[r])
-}
-
-// IsPrivateUse reports whether r has the ISO 3166 User-assigned status. This
-// may include private-use tags that are assigned by CLDR and used in this
-// implementation. So IsPrivateUse and IsCountry can be simultaneously true.
-func (r regionID) IsPrivateUse() bool {
- return r.typ()&iso3166UserAssigned != 0
-}
-
-type scriptID uint8
-
-// getScriptID returns the script id for string s. It assumes that s
-// is of the format [A-Z][a-z]{3}.
-func getScriptID(idx tag.Index, s []byte) (scriptID, error) {
- i, err := findIndex(idx, s, "Zzzz")
- return scriptID(i), err
-}
-
-// String returns the script code in title case.
-// It returns "Zzzz" for an unspecified script.
-func (s scriptID) String() string {
- if s == 0 {
- return "Zzzz"
- }
- return script.Elem(int(s))
-}
-
-// IsPrivateUse reports whether this script code is reserved for private use.
-func (s scriptID) IsPrivateUse() bool {
- return _Qaaa <= s && s <= _Qabx
-}
-
-const (
- maxAltTaglen = len("en-US-POSIX")
- maxLen = maxAltTaglen
-)
-
-var (
- // grandfatheredMap holds a mapping from legacy and grandfathered tags to
- // their base language or index to more elaborate tag.
- grandfatheredMap = map[[maxLen]byte]int16{
- [maxLen]byte{'a', 'r', 't', '-', 'l', 'o', 'j', 'b', 'a', 'n'}: _jbo, // art-lojban
- [maxLen]byte{'i', '-', 'a', 'm', 'i'}: _ami, // i-ami
- [maxLen]byte{'i', '-', 'b', 'n', 'n'}: _bnn, // i-bnn
- [maxLen]byte{'i', '-', 'h', 'a', 'k'}: _hak, // i-hak
- [maxLen]byte{'i', '-', 'k', 'l', 'i', 'n', 'g', 'o', 'n'}: _tlh, // i-klingon
- [maxLen]byte{'i', '-', 'l', 'u', 'x'}: _lb, // i-lux
- [maxLen]byte{'i', '-', 'n', 'a', 'v', 'a', 'j', 'o'}: _nv, // i-navajo
- [maxLen]byte{'i', '-', 'p', 'w', 'n'}: _pwn, // i-pwn
- [maxLen]byte{'i', '-', 't', 'a', 'o'}: _tao, // i-tao
- [maxLen]byte{'i', '-', 't', 'a', 'y'}: _tay, // i-tay
- [maxLen]byte{'i', '-', 't', 's', 'u'}: _tsu, // i-tsu
- [maxLen]byte{'n', 'o', '-', 'b', 'o', 'k'}: _nb, // no-bok
- [maxLen]byte{'n', 'o', '-', 'n', 'y', 'n'}: _nn, // no-nyn
- [maxLen]byte{'s', 'g', 'n', '-', 'b', 'e', '-', 'f', 'r'}: _sfb, // sgn-BE-FR
- [maxLen]byte{'s', 'g', 'n', '-', 'b', 'e', '-', 'n', 'l'}: _vgt, // sgn-BE-NL
- [maxLen]byte{'s', 'g', 'n', '-', 'c', 'h', '-', 'd', 'e'}: _sgg, // sgn-CH-DE
- [maxLen]byte{'z', 'h', '-', 'g', 'u', 'o', 'y', 'u'}: _cmn, // zh-guoyu
- [maxLen]byte{'z', 'h', '-', 'h', 'a', 'k', 'k', 'a'}: _hak, // zh-hakka
- [maxLen]byte{'z', 'h', '-', 'm', 'i', 'n', '-', 'n', 'a', 'n'}: _nan, // zh-min-nan
- [maxLen]byte{'z', 'h', '-', 'x', 'i', 'a', 'n', 'g'}: _hsn, // zh-xiang
-
- // Grandfathered tags with no modern replacement will be converted as
- // follows:
- [maxLen]byte{'c', 'e', 'l', '-', 'g', 'a', 'u', 'l', 'i', 's', 'h'}: -1, // cel-gaulish
- [maxLen]byte{'e', 'n', '-', 'g', 'b', '-', 'o', 'e', 'd'}: -2, // en-GB-oed
- [maxLen]byte{'i', '-', 'd', 'e', 'f', 'a', 'u', 'l', 't'}: -3, // i-default
- [maxLen]byte{'i', '-', 'e', 'n', 'o', 'c', 'h', 'i', 'a', 'n'}: -4, // i-enochian
- [maxLen]byte{'i', '-', 'm', 'i', 'n', 'g', 'o'}: -5, // i-mingo
- [maxLen]byte{'z', 'h', '-', 'm', 'i', 'n'}: -6, // zh-min
-
- // CLDR-specific tag.
- [maxLen]byte{'r', 'o', 'o', 't'}: 0, // root
- [maxLen]byte{'e', 'n', '-', 'u', 's', '-', 'p', 'o', 's', 'i', 'x'}: -7, // en_US_POSIX"
- }
-
- altTagIndex = [...]uint8{0, 17, 31, 45, 61, 74, 86, 102}
-
- altTags = "xtg-x-cel-gaulishen-GB-oxendicten-x-i-defaultund-x-i-enochiansee-x-i-mingonan-x-zh-minen-US-u-va-posix"
-)
-
-func grandfathered(s [maxAltTaglen]byte) (t Tag, ok bool) {
- if v, ok := grandfatheredMap[s]; ok {
- if v < 0 {
- return Make(altTags[altTagIndex[-v-1]:altTagIndex[-v]]), true
- }
- t.lang = langID(v)
- return t, true
- }
- return t, false
-}
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