Created
November 22, 2023 15:38
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Metaphone Spanish
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import Foundation | |
class MetaphoneSpanish { | |
private class func stringAt(_ string: String, _ start: Int, _ length: Int, _ list: [String]) -> Bool { | |
if start < 0 || start >= string.count { | |
return false | |
} | |
let substring = string[string.index(string.startIndex, offsetBy: start)..<string.index(string.startIndex, offsetBy: start+length)] | |
for expr in list { | |
if substring.contains(expr) { | |
return true | |
} | |
} | |
return false | |
} | |
private class func isVowel(_ string: String, _ position: Int) -> Bool { | |
let character = string[string.index(string.startIndex, offsetBy: position)] | |
return ["A", "E", "I", "O", "U"].contains(String(character)) | |
} | |
private class func translateCharacters(_ string: String) -> String { | |
let translated: [String: String] = [ | |
"á": "A", | |
"ch": "X", | |
"ç": "S", | |
"é": "E", | |
"í": "I", | |
"ó": "O", | |
"ú": "U", | |
"ñ": "NY", | |
"gü": "W", | |
"ü": "U", | |
"b": "V", | |
// "z": "S", | |
"ll": "Y" | |
] | |
var result = string | |
for (key, value) in translated { | |
result = result.replacingOccurrences(of: key, with: value) | |
} | |
return result | |
} | |
func metaphone(_ string: String, _ phonemes: Int = 0) -> String { | |
var metaKey = "" | |
var currentPos = 0 | |
var originalString = string + " " | |
originalString = MetaphoneSpanish.translateCharacters(originalString) | |
originalString = originalString.uppercased() | |
while phonemes == 0 || metaKey.count < phonemes { | |
if currentPos >= originalString.count { | |
break | |
} | |
let currentChar = originalString[originalString.index(originalString.startIndex, offsetBy: currentPos)] | |
if MetaphoneSpanish.isVowel(originalString, currentPos) && currentPos == 0 { | |
metaKey += String(currentChar) | |
currentPos += 1 | |
} else { | |
let singleSoundChars = ["D", "F", "J", "K", "M", "N", "P", "T", "V", "L", "Y"] | |
if MetaphoneSpanish.stringAt(originalString, currentPos, 1, singleSoundChars) { | |
metaKey += String(currentChar) | |
if originalString[originalString.index(originalString.startIndex, offsetBy: currentPos + 1)] == currentChar { | |
currentPos += 2 | |
} else { | |
currentPos += 1 | |
} | |
} else { | |
if currentChar == "C" { | |
if originalString[originalString.index(originalString.startIndex, offsetBy: currentPos + 1)] == "C" { | |
metaKey += "X" | |
currentPos += 2 | |
} else if MetaphoneSpanish.stringAt(originalString, currentPos, 2, ["CE", "CI"]) { | |
metaKey += "Z" | |
currentPos += 2 | |
} else { | |
metaKey += "K" | |
currentPos += 1 | |
} | |
} else if currentChar == "G" { | |
if MetaphoneSpanish.stringAt(originalString, currentPos, 2, ["GE", "GI"]) { | |
metaKey += "J" | |
currentPos += 2 | |
} else { | |
metaKey += "G" | |
currentPos += 1 | |
} | |
} else if currentChar == "H" { | |
if MetaphoneSpanish.isVowel(originalString, currentPos + 1) { | |
metaKey += String(originalString[originalString.index(originalString.startIndex, offsetBy: currentPos + 1)]) | |
currentPos += 2 | |
} else { | |
metaKey += "H" | |
currentPos += 1 | |
} | |
} else if currentChar == "Q" { | |
if originalString[originalString.index(originalString.startIndex, offsetBy: currentPos + 1)] == "U" { | |
currentPos += 2 | |
} else { | |
currentPos += 1 | |
} | |
metaKey += "K" | |
} else if currentChar == "W" { | |
metaKey += "U" | |
currentPos += 1 | |
} else if currentChar == "R" { | |
currentPos += 1 | |
metaKey += "R" | |
} else if currentChar == "S" { | |
if !MetaphoneSpanish.isVowel(originalString, currentPos + 1) && currentPos == 0 { | |
metaKey += "ES" | |
currentPos += 1 | |
} else { | |
currentPos += 1 | |
metaKey += "S" | |
} | |
} else if currentChar == "Z" { | |
currentPos += 1 | |
metaKey += "Z" | |
} else if currentChar == "X" { | |
if !MetaphoneSpanish.isVowel(originalString, currentPos + 1) | |
&& originalString.count > 1 | |
&& currentPos == 0 { | |
metaKey += "EX" | |
currentPos += 1 | |
} else { | |
metaKey += "X" | |
currentPos += 1 | |
} | |
} else { | |
currentPos += 1 | |
} | |
} | |
} | |
} | |
metaKey = metaKey.trimmingCharacters(in: .whitespacesAndNewlines) | |
return metaKey | |
} | |
} | |
// Example usage: | |
let metaphoneSpanish = MetaphoneSpanish() | |
let metaphoneKey = metaphoneSpanish.metaphone("El Parlamento Europeo acaba de dar un espaldarazo"" ") | |
print(metaphoneKey) |
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