chen08209
69 lines
2.3 KiB
Go
69 lines
2.3 KiB
Go
package core
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import "strings"
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// Five bytes per entry, alpha-3 then alpha-2, sorted by alpha-3.
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const iso3166Packed = "ABWAWAFGAFAGOAOAIAAIALAAXALBALANDADAREAEARGARARMAMASMASATAAQ" +
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"ATFTFATGAGAUSAUAUTATAZEAZBDIBIBELBEBENBJBESBQBFABFBGDBDBGRBG" +
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"BHRBHBHSBSBIHBABLMBLBLRBYBLZBZBMUBMBOLBOBRABRBRBBBBRNBNBTNBT" +
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"BVTBVBWABWCAFCFCANCACCKCCCHECHCHLCLCHNCNCIVCICMRCMCODCDCOGCG" +
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"COKCKCOLCOCOMKMCPVCVCRICRCUBCUCUWCWCXRCXCYMKYCYPCYCZECZDEUDE" +
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"DJIDJDMADMDNKDKDOMDODZADZECUECEGYEGERIERESHEHESPESESTEEETHET" +
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"FINFIFJIFJFLKFKFRAFRFROFOFSMFMGABGAGBRGBGEOGEGGYGGGHAGHGIBGI" +
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"GINGNGLPGPGMBGMGNBGWGNQGQGRCGRGRDGDGRLGLGTMGTGUFGFGUMGUGUYGY" +
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"HKGHKHMDHMHNDHNHRVHRHTIHTHUNHUIDNIDIMNIMINDINIOTIOIRLIEIRNIR" +
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"IRQIQISLISISRILITAITJAMJMJEYJEJORJOJPNJPKAZKZKENKEKGZKGKHMKH" +
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"KIRKIKNAKNKORKRKWTKWLAOLALBNLBLBRLRLBYLYLCALCLIELILKALKLSOLS" +
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"LTULTLUXLULVALVMACMOMAFMFMARMAMCOMCMDAMDMDGMGMDVMVMEXMXMHLMH" +
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"MKDMKMLIMLMLTMTMMRMMMNEMEMNGMNMNPMPMOZMZMRTMRMSRMSMTQMQMUSMU" +
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"MWIMWMYSMYMYTYTNAMNANCLNCNERNENFKNFNGANGNICNINIUNUNLDNLNORNO" +
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"NPLNPNRUNRNZLNZOMNOMPAKPKPANPAPCNPNPERPEPHLPHPLWPWPNGPGPOLPL" +
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"PRIPRPRKKPPRTPTPRYPYPSEPSPYFPFQATQAREUREROURORUSRURWARWSAUSA" +
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"SDNSDSENSNSGPSGSGSGSSHNSHSJMSJSLBSBSLESLSLVSVSMRSMSOMSOSPMPM" +
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"SRBRSSSDSSSTPSTSURSRSVKSKSVNSISWESESWZSZSXMSXSYCSCSYRSYTCATC" +
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"TCDTDTGOTGTHATHTJKTJTKLTKTKMTMTLSTLTONTOTTOTTTUNTNTURTRTUVTV" +
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"TWNTWTZATZUGAUGUKRUAUMIUMURYUYUSAUSUZBUZVATVAVCTVCVENVEVGBVG" +
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"VIRVIVNMVNVUTVUWLFWFWSMWSYEMYEZAFZAZMBZMZWEZW"
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// normalizeRegion folds a country code to the alpha-2 form Dart renders a flag
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// from, or "" when it is not one. Only Gemini reports alpha-3.
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func normalizeRegion(code string) string {
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code = strings.ToUpper(strings.TrimSpace(code))
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switch len(code) {
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case 2:
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if isAsciiUpper(code) {
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return code
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}
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return ""
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case 3:
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if !isAsciiUpper(code) {
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return ""
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}
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low, high := 0, len(iso3166Packed)/5
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for low < high {
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mid := (low + high) / 2
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entry := iso3166Packed[mid*5 : mid*5+3]
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switch {
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case entry < code:
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low = mid + 1
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case entry > code:
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high = mid
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default:
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return iso3166Packed[mid*5+3 : mid*5+5]
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}
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}
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return ""
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default:
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return ""
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}
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}
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func isAsciiUpper(value string) bool {
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for _, char := range value {
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if char < 'A' || char > 'Z' {
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return false
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}
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}
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return true
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}
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