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collate.go
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package collate
import (
"sort"
"strings"
"github.com/tidwall/gjson"
"golang.org/x/text/collate"
"golang.org/x/text/language"
)
// SupportedLangs returns all of the languages that Index() supports.
func SupportedLangs() []string {
var langs []string
for _, tag := range langMap {
langs = append(langs, tag.name)
}
sort.Strings(langs)
return langs
}
// IndexString returns a Less function that can be used to compare if
// string "a" is less than string "b".
// The "name" parameter should be a valid collate definition.
//
// Examples of collation names
// --------------------------------------------------------------------
// ENGLISH, EN -- English
// AMERICANENGLISH, EN-US -- English US
// FRENCH, FR -- French
// CHINESE, ZH -- Chinese
// SIMPLIFIEDCHINESE, ZH-HANS -- Simplified Chinese
// ...
//
// Case insensitive: add the CI tag to the name
// --------------------------------------------------------------------
// ENGLISH_CI
// FR_CI
// ZH-HANS_CI
// ...
//
// Case sensitive: add the CS tag to the name
// --------------------------------------------------------------------
// ENGLISH_CS
// FR_CS
// ZH-HANS_CS
// ...
//
// For numerics: add the NUM tag to the name
// Specifies that numbers should sort numerically ("2" < "12")
// --------------------------------------------------------------------
// DUTCH_NUM
// JAPANESE_NUM
// ...
//
// For loosness: add the LOOSE tag to the name
// Ignores diacritics, case and weight
// --------------------------------------------------------------------
// JA_LOOSE
// CHINESE_LOOSE
// ...
//
func IndexString(name string) (less func(a, b string) bool) {
t, opts := parseCollation(name)
c := collate.New(t, opts...)
return func(a, b string) bool {
return c.CompareString(a, b) == -1
}
}
// IndexJSON is like IndexString expect for json.
// The "name" parameter should be a valid collate definition.
// The "path" parameter should be a valid gjson path.
func IndexJSON(name, path string) (less func(a, b string) bool) {
t, opts := parseCollation(name)
c := collate.New(t, opts...)
return func(a, b string) bool {
ra := gjson.Get(a, path)
rb := gjson.Get(b, path)
if ra.Type == gjson.String || rb.Type == gjson.String {
return c.CompareString(ra.String(), rb.String()) < 0
}
return ra.Less(rb, false)
}
}
func parseCollation(s string) (tag language.Tag, opts []collate.Option) {
parts := strings.Split(s, "_")
if lt, ok := langMap[strings.ToLower(parts[0])]; ok {
tag = lt.tag
} else {
tag = language.Make(parts[0])
}
if tag == language.Und {
tag = language.English
}
opts = append(opts, collate.OptionsFromTag(tag))
for i := 1; i < len(parts); i++ {
switch strings.ToLower(parts[i]) {
case "ci":
opts = append(opts, collate.IgnoreCase)
case "num":
opts = append(opts, collate.Numeric)
case "loose":
opts = append(opts, collate.Loose)
}
}
return tag, opts
}
type tlang struct {
name string
tag language.Tag
}
var langMap = map[string]tlang{
"afrikaans": tlang{"Afrikaans", language.Afrikaans},
"amharic": tlang{"Amharic", language.Amharic},
"arabic": tlang{"Arabic", language.Arabic},
"modernstandardarabic": tlang{"ModernStandardArabic", language.ModernStandardArabic},
"azerbaijani": tlang{"Azerbaijani", language.Azerbaijani},
"bulgarian": tlang{"Bulgarian", language.Bulgarian},
"bengali": tlang{"Bengali", language.Bengali},
"catalan": tlang{"Catalan", language.Catalan},
"czech": tlang{"Czech", language.Czech},
"danish": tlang{"Danish", language.Danish},
"german": tlang{"German", language.German},
"greek": tlang{"Greek", language.Greek},
"english": tlang{"English", language.English},
"americanenglish": tlang{"AmericanEnglish", language.AmericanEnglish},
"britishenglish": tlang{"BritishEnglish", language.BritishEnglish},
"spanish": tlang{"Spanish", language.Spanish},
"europeanspanish": tlang{"EuropeanSpanish", language.EuropeanSpanish},
"latinamericanspanish": tlang{"LatinAmericanSpanish", language.LatinAmericanSpanish},
"estonian": tlang{"Estonian", language.Estonian},
"persian": tlang{"Persian", language.Persian},
"finnish": tlang{"Finnish", language.Finnish},
"filipino": tlang{"Filipino", language.Filipino},
"french": tlang{"French", language.French},
"canadianfrench": tlang{"CanadianFrench", language.CanadianFrench},
"gujarati": tlang{"Gujarati", language.Gujarati},
"hebrew": tlang{"Hebrew", language.Hebrew},
"hindi": tlang{"Hindi", language.Hindi},
"croatian": tlang{"Croatian", language.Croatian},
"hungarian": tlang{"Hungarian", language.Hungarian},
"armenian": tlang{"Armenian", language.Armenian},
"indonesian": tlang{"Indonesian", language.Indonesian},
"icelandic": tlang{"Icelandic", language.Icelandic},
"italian": tlang{"Italian", language.Italian},
"japanese": tlang{"Japanese", language.Japanese},
"georgian": tlang{"Georgian", language.Georgian},
"kazakh": tlang{"Kazakh", language.Kazakh},
"khmer": tlang{"Khmer", language.Khmer},
"kannada": tlang{"Kannada", language.Kannada},
"korean": tlang{"Korean", language.Korean},
"kirghiz": tlang{"Kirghiz", language.Kirghiz},
"lao": tlang{"Lao", language.Lao},
"lithuanian": tlang{"Lithuanian", language.Lithuanian},
"latvian": tlang{"Latvian", language.Latvian},
"macedonian": tlang{"Macedonian", language.Macedonian},
"malayalam": tlang{"Malayalam", language.Malayalam},
"mongolian": tlang{"Mongolian", language.Mongolian},
"marathi": tlang{"Marathi", language.Marathi},
"malay": tlang{"Malay", language.Malay},
"burmese": tlang{"Burmese", language.Burmese},
"nepali": tlang{"Nepali", language.Nepali},
"dutch": tlang{"Dutch", language.Dutch},
"norwegian": tlang{"Norwegian", language.Norwegian},
"punjabi": tlang{"Punjabi", language.Punjabi},
"polish": tlang{"Polish", language.Polish},
"portuguese": tlang{"Portuguese", language.Portuguese},
"brazilianportuguese": tlang{"BrazilianPortuguese", language.BrazilianPortuguese},
"europeanportuguese": tlang{"EuropeanPortuguese", language.EuropeanPortuguese},
"romanian": tlang{"Romanian", language.Romanian},
"russian": tlang{"Russian", language.Russian},
"sinhala": tlang{"Sinhala", language.Sinhala},
"slovak": tlang{"Slovak", language.Slovak},
"slovenian": tlang{"Slovenian", language.Slovenian},
"albanian": tlang{"Albanian", language.Albanian},
"serbian": tlang{"Serbian", language.Serbian},
"serbianlatin": tlang{"SerbianLatin", language.SerbianLatin},
"swedish": tlang{"Swedish", language.Swedish},
"swahili": tlang{"Swahili", language.Swahili},
"tamil": tlang{"Tamil", language.Tamil},
"telugu": tlang{"Telugu", language.Telugu},
"thai": tlang{"Thai", language.Thai},
"turkish": tlang{"Turkish", language.Turkish},
"ukrainian": tlang{"Ukrainian", language.Ukrainian},
"urdu": tlang{"Urdu", language.Urdu},
"uzbek": tlang{"Uzbek", language.Uzbek},
"vietnamese": tlang{"Vietnamese", language.Vietnamese},
"chinese": tlang{"Chinese", language.Chinese},
"simplifiedchinese": tlang{"SimplifiedChinese", language.SimplifiedChinese},
"traditionalchinese": tlang{"TraditionalChinese", language.TraditionalChinese},
"zulu": tlang{"Zulu", language.Zulu},
}