Data commit

Task/Textonyms/Swift/textonyms.swift

@@ -0,0 +1,92 @@
+import Foundation
+
+func textCharacter(_ ch: Character) -> Character? {
+    switch (ch) {
+    case "a", "b", "c":
+        return "2"
+    case "d", "e", "f":
+        return "3"
+    case "g", "h", "i":
+        return "4"
+    case "j", "k", "l":
+        return "5"
+    case "m", "n", "o":
+        return "6"
+    case "p", "q", "r", "s":
+        return "7"
+    case "t", "u", "v":
+        return "8"
+    case "w", "x", "y", "z":
+        return "9"
+    default:
+        return nil
+    }
+}
+
+func textString(_ string: String) -> String? {
+    var result = String()
+    result.reserveCapacity(string.count)
+    for ch in string {
+        if let tch = textCharacter(ch) {
+            result.append(tch)
+        } else {
+            return nil
+        }
+    }
+    return result
+}
+
+func compareByWordCount(pair1: (key: String, value: [String]),
+                        pair2: (key: String, value: [String])) -> Bool {
+    if pair1.value.count == pair2.value.count {
+        return pair1.key < pair2.key
+    }
+    return pair1.value.count > pair2.value.count
+}
+
+func compareByTextLength(pair1: (key: String, value: [String]),
+                         pair2: (key: String, value: [String])) -> Bool {
+    if pair1.key.count == pair2.key.count {
+        return pair1.key < pair2.key
+    }
+    return pair1.key.count > pair2.key.count
+}
+
+func findTextonyms(_ path: String) throws {
+    var dict = Dictionary<String, [String]>()
+    let contents = try String(contentsOfFile: path, encoding: String.Encoding.ascii)
+    var count = 0
+    for line in contents.components(separatedBy: "\n") {
+        if line.isEmpty {
+            continue
+        }
+        let word = line.lowercased()
+        if let text = textString(word) {
+            dict[text, default: []].append(word)
+            count += 1
+        }
+    }
+    var textonyms = Array(dict.filter{$0.1.count > 1})
+    print("There are \(count) words in '\(path)' which can be represented by the digit key mapping.")
+    print("They require \(dict.count) digit combinations to represent them.")
+    print("\(textonyms.count) digit combinations represent Textonyms.")
+
+    let top = min(5, textonyms.count)
+    print("\nTop \(top) by number of words:")
+    textonyms.sort(by: compareByWordCount)
+    for (text, words) in textonyms.prefix(top) {
+        print("\(text) = \(words.joined(separator: ", "))")
+    }
+
+    print("\nTop \(top) by length:")
+    textonyms.sort(by: compareByTextLength)
+    for (text, words) in textonyms.prefix(top) {
+        print("\(text) = \(words.joined(separator: ", "))")
+    }
+}
+
+do {
+    try findTextonyms("unixdict.txt")
+} catch {
+    print(error.localizedDescription)
+}