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Add mimeName to String.Encoding. #281

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Aug 15, 2024
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Add mimeName to String.Encoding. #281

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46 changes: 46 additions & 0 deletions Sources/String.swift
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Original file line number Diff line number Diff line change
Expand Up @@ -215,4 +215,50 @@ extension String.Encoding {
return self.description
}
}

/// Errors that are thrown when a ``String.Encoding`` fails to be represented as a MIME type.
public enum EncodingMIMETypeError: Error, LocalizedError {
/// There is no IANA equivalent of the provided string encoding.
case noIANAEquivalent(String.Encoding)

/// Returns a human-readable representation of this error.
public var errorDescription: String? {
switch self {
case .noIANAEquivalent(let encoding):
return String("There is no IANA equivalent for \(encoding)")
}
}
}

/// Returns the encoding as an equivalent IANA MIME name.
///
/// - SeeAlso: https://www.iana.org/assignments/character-sets/character-sets.xhtml
/// - Throws: EncodingMIMETypeError if there is no IANA-compatible MIME name.
public func mimeName() throws -> String {
switch self {
case .ascii: return "US-ASCII"
case .nextstep: throw EncodingMIMETypeError.noIANAEquivalent(self)
case .japaneseEUC: return "EUC-JP"
case .utf8: return "UTF-8"
case .isoLatin1: return "csISOLatin1"
case .symbol: throw EncodingMIMETypeError.noIANAEquivalent(self)
case .nonLossyASCII: return "US-ASCII"
case .shiftJIS: return "Shift_JIS"
case .isoLatin2: return "csISOLatin2"
case .windowsCP1251: return "windows-1251"
case .windowsCP1252: return "windows-1252"
case .windowsCP1253: return "windows-1253"
case .windowsCP1254: return "windows-1254"
case .windowsCP1250: return "windows-1250"
case .iso2022JP: return "csISO2022JP"
case .macOSRoman: throw EncodingMIMETypeError.noIANAEquivalent(self)
case .utf16: return "UTF-16"
case .utf16BigEndian: return "UTF-16BE"
case .utf16LittleEndian: return "UTF-16LE"
case .utf32: return "UTF-32"
case .utf32BigEndian: return "UTF-32BE"
case .utf32LittleEndian: return "UTF-32LE"
default: throw EncodingMIMETypeError.noIANAEquivalent(self)
}
}
}
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