Claudio Ortolina
364 lines
7.4 KiB
Elixir
364 lines
7.4 KiB
Elixir
defmodule MusicLibrary.Country do
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@moduledoc """
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Converts country codes to flag emojis.
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Supports alpha-2 (`"US"`), alpha-3 (`"USA"`), subdivision (`"GB-SCT"`),
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and IETF language tag (`"en-US"`) formats.
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"""
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@regional_indicator_offset 0x1F1E6 - ?a
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@tag_offset 0xE0000
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@black_flag <<0x1F3F4::utf8>>
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@cancel_tag <<0xE007F::utf8>>
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# ISO 3166-1 alpha-3 to alpha-2 mapping
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@alpha3_to_alpha2 %{
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"ABW" => "AW",
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"AFG" => "AF",
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"AGO" => "AO",
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"AIA" => "AI",
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"ALA" => "AX",
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"ALB" => "AL",
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"AND" => "AD",
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"ARE" => "AE",
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"ARG" => "AR",
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"ARM" => "AM",
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"ASM" => "AS",
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"ATA" => "AQ",
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"ATF" => "TF",
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"ATG" => "AG",
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"AUS" => "AU",
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"AUT" => "AT",
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"AZE" => "AZ",
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"BDI" => "BI",
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"BEL" => "BE",
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"BEN" => "BJ",
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"BES" => "BQ",
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"BFA" => "BF",
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"BGD" => "BD",
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"BGR" => "BG",
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"BHR" => "BH",
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"BHS" => "BS",
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"BIH" => "BA",
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"BLM" => "BL",
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"BLR" => "BY",
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"BLZ" => "BZ",
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"BMU" => "BM",
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"BOL" => "BO",
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"BRA" => "BR",
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"BRB" => "BB",
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"BRN" => "BN",
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"BTN" => "BT",
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"BVT" => "BV",
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"BWA" => "BW",
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"CAF" => "CF",
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"CAN" => "CA",
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"CCK" => "CC",
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"CHE" => "CH",
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"CHL" => "CL",
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"CHN" => "CN",
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"CIV" => "CI",
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"CMR" => "CM",
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"COD" => "CD",
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"COG" => "CG",
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"COK" => "CK",
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"COL" => "CO",
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"COM" => "KM",
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"CPV" => "CV",
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"CRI" => "CR",
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"CUB" => "CU",
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"CUW" => "CW",
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"CXR" => "CX",
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"CYM" => "KY",
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"CYP" => "CY",
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"CZE" => "CZ",
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"DEU" => "DE",
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"DJI" => "DJ",
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"DMA" => "DM",
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"DNK" => "DK",
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"DOM" => "DO",
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"DZA" => "DZ",
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"ECU" => "EC",
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"EGY" => "EG",
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"ERI" => "ER",
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"ESH" => "EH",
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"ESP" => "ES",
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"EST" => "EE",
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"ETH" => "ET",
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"FIN" => "FI",
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"FJI" => "FJ",
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"FLK" => "FK",
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"FRA" => "FR",
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"FRO" => "FO",
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"FSM" => "FM",
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"GAB" => "GA",
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"GBR" => "GB",
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"GEO" => "GE",
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"GGY" => "GG",
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"GHA" => "GH",
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"GIB" => "GI",
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"GIN" => "GN",
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"GLP" => "GP",
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"GMB" => "GM",
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"GNB" => "GW",
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"GNQ" => "GQ",
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"GRC" => "GR",
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"GRD" => "GD",
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"GRL" => "GL",
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"GTM" => "GT",
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"GUF" => "GF",
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"GUM" => "GU",
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"GUY" => "GY",
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"HKG" => "HK",
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"HMD" => "HM",
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"HND" => "HN",
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"HRV" => "HR",
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"HTI" => "HT",
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"HUN" => "HU",
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"IDN" => "ID",
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"IMN" => "IM",
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"IND" => "IN",
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"IOT" => "IO",
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"IRL" => "IE",
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"IRN" => "IR",
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"IRQ" => "IQ",
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"ISL" => "IS",
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"ISR" => "IL",
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"ITA" => "IT",
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"JAM" => "JM",
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"JEY" => "JE",
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"JOR" => "JO",
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"JPN" => "JP",
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"KAZ" => "KZ",
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"KEN" => "KE",
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"KGZ" => "KG",
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"KHM" => "KH",
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"KIR" => "KI",
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"KNA" => "KN",
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"KOR" => "KR",
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"KWT" => "KW",
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"LAO" => "LA",
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"LBN" => "LB",
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"LBR" => "LR",
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"LBY" => "LY",
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"LCA" => "LC",
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"LIE" => "LI",
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"LKA" => "LK",
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"LSO" => "LS",
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"LTU" => "LT",
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"LUX" => "LU",
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"LVA" => "LV",
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"MAC" => "MO",
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"MAF" => "MF",
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"MAR" => "MA",
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"MCO" => "MC",
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"MDA" => "MD",
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"MDG" => "MG",
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"MDV" => "MV",
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"MEX" => "MX",
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"MHL" => "MH",
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"MKD" => "MK",
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"MLI" => "ML",
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"MLT" => "MT",
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"MMR" => "MM",
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"MNE" => "ME",
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"MNG" => "MN",
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"MNP" => "MP",
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"MOZ" => "MZ",
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"MRT" => "MR",
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"MSR" => "MS",
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"MTQ" => "MQ",
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"MUS" => "MU",
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"MWI" => "MW",
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"MYS" => "MY",
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"MYT" => "YT",
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"NAM" => "NA",
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"NCL" => "NC",
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"NER" => "NE",
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"NFK" => "NF",
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"NGA" => "NG",
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"NIC" => "NI",
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"NIU" => "NU",
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"NLD" => "NL",
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"NOR" => "NO",
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"NPL" => "NP",
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"NRU" => "NR",
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"NZL" => "NZ",
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"OMN" => "OM",
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"PAK" => "PK",
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"PAN" => "PA",
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"PCN" => "PN",
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"PER" => "PE",
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"PHL" => "PH",
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"PLW" => "PW",
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"PNG" => "PG",
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"POL" => "PL",
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"PRI" => "PR",
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"PRK" => "KP",
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"PRT" => "PT",
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"PRY" => "PY",
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"PSE" => "PS",
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"PYF" => "PF",
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"QAT" => "QA",
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"REU" => "RE",
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"ROU" => "RO",
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"RUS" => "RU",
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"RWA" => "RW",
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"SAU" => "SA",
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"SDN" => "SD",
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"SEN" => "SN",
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"SGP" => "SG",
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"SGS" => "GS",
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"SHN" => "SH",
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"SJM" => "SJ",
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"SLB" => "SB",
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"SLE" => "SL",
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"SLV" => "SV",
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"SMR" => "SM",
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"SOM" => "SO",
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"SPM" => "PM",
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"SRB" => "RS",
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"SSD" => "SS",
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"STP" => "ST",
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"SUR" => "SR",
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"SVK" => "SK",
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"SVN" => "SI",
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"SWE" => "SE",
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"SWZ" => "SZ",
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"SXM" => "SX",
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"SYC" => "SC",
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"SYR" => "SY",
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"TCA" => "TC",
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"TCD" => "TD",
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"TGO" => "TG",
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"THA" => "TH",
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"TJK" => "TJ",
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"TKL" => "TK",
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"TKM" => "TM",
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"TLS" => "TL",
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"TON" => "TO",
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"TTO" => "TT",
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"TUN" => "TN",
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"TUR" => "TR",
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"TUV" => "TV",
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"TWN" => "TW",
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"TZA" => "TZ",
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"UGA" => "UG",
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"UKR" => "UA",
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"UMI" => "UM",
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"URY" => "UY",
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"USA" => "US",
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"UZB" => "UZ",
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"VAT" => "VA",
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"VCT" => "VC",
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"VEN" => "VE",
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"VGB" => "VG",
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"VIR" => "VI",
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"VNM" => "VN",
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"VUT" => "VU",
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"WLF" => "WF",
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"WSM" => "WS",
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"XKX" => "XK",
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"YEM" => "YE",
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"ZAF" => "ZA",
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"ZMB" => "ZM",
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"ZWE" => "ZW"
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}
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@doc """
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Converts a country code to a flag emoji.
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Accepts alpha-2 (`"US"`), alpha-3 (`"USA"`), subdivision (`"GB-SCT"`),
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and IETF language tag (`"en-US"`) formats. Case insensitive.
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## Examples
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iex> MusicLibrary.Country.to_emoji("US")
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"🇺🇸"
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iex> MusicLibrary.Country.to_emoji("PL")
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"🇵🇱"
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iex> MusicLibrary.Country.to_emoji("GB")
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"🇬🇧"
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iex> MusicLibrary.Country.to_emoji("us")
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"🇺🇸"
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iex> MusicLibrary.Country.to_emoji("pl")
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"🇵🇱"
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iex> MusicLibrary.Country.to_emoji("GB-SCT")
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"🏴"
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iex> MusicLibrary.Country.to_emoji("GB-WLS")
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"🏴"
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iex> MusicLibrary.Country.to_emoji("GB-ENG")
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"🏴"
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iex> MusicLibrary.Country.to_emoji("GB-CYM") == MusicLibrary.Country.to_emoji("GB-WLS")
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true
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iex> MusicLibrary.Country.to_emoji("USA")
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"🇺🇸"
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iex> MusicLibrary.Country.to_emoji("GBR")
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"🇬🇧"
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iex> MusicLibrary.Country.to_emoji("POL")
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"🇵🇱"
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iex> MusicLibrary.Country.to_emoji("en-US")
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"🇺🇸"
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iex> MusicLibrary.Country.to_emoji("pl-PL")
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"🇵🇱"
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"""
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@spec to_emoji(String.t()) :: String.t()
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def to_emoji(code) when is_binary(code) do
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code
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|> normalize()
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|> convert()
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end
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defp normalize(code) do
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code = String.upcase(code)
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cond do
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String.contains?(code, "-") -> normalize_with_separator(code)
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String.length(code) == 3 -> Map.get(@alpha3_to_alpha2, code, code)
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true -> code
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end
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end
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defp normalize_with_separator(code) do
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case String.split(code, "-") do
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[country, subdivision] when byte_size(country) == 2 and byte_size(subdivision) > 2 ->
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subdivision = if subdivision == "CYM", do: "WLS", else: subdivision
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{:subdivision, country <> subdivision}
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parts ->
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List.last(parts)
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end
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end
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defp convert({:subdivision, code}) do
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tags =
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code
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|> String.downcase()
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|> String.to_charlist()
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|> Enum.map_join(fn char -> <<char + @tag_offset::utf8>> end)
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@black_flag <> tags <> @cancel_tag
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end
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defp convert(code) when is_binary(code) do
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code
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|> String.downcase()
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|> String.to_charlist()
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|> Enum.map_join(fn char -> <<char + @regional_indicator_offset::utf8>> end)
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end
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end
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