add Character.getNumericValue (char)

Author: bastie

Sources/JavApi/JavApi⁴Swift.docc/Java2Swift.md

@@ -196,6 +196,22 @@ The translation has a Optional problem because Java reference types are implicit
 
 Default methods are implemented in a extension, because the mapping of Java interfaces in a Java package like structures need a bit more code. 
 
+##### toString() method
+
+If special toString() implemetation is in Java, first let your Swift type be conform to the *CustomStringConvertible*. Next implement the property *description*. For example
+
+```swift
+public func toString () -> String {
+  return "My name is Bond, James Bond"
+}
+
+public var description: String {
+  get {
+    return self.toString()
+  }
+}
+```
+
 #### nested classes
 
 Nested classes in Swift can not access to enclosing type variables. Give the nested class the needed variables as (weak) parameters.
@@ -270,6 +286,23 @@ Swiftify is a JavApi extension. It make additional implementations of Java metho
 
 Java cases `fallthrough` by default and need explicite `break` if not. But Java need no `default`. Also newer Java can use `->` instead of `:`.
 
+If you use enum values in switch, you need a dot before the value name in case.
+
+```java
+switch (enumType){
+case ENUM_NAME: break;
+default: break;
+}
+```
+
+
+```swift
+switch (enumType){
+case .ENUM_NAME: break;
+default: break;
+}
+```
+
 #### visibility
 
 Swift visiblilities are:

Sources/JavApi/lang/Character+Java.swift

@@ -33,8 +33,67 @@ extension Character {
     asString = String(String.UnicodeScalarView(asArray))
     return isLetter(asString.toCharArray()[0])
   }
-    
+  
   public static func isWhitespace (_ char : char) -> boolean {
     return char.isWhitespace
   }
+  
+  /// Return the numeric value of Unicode character, f.e. ``\u{216D}`` returns  100.
+  ///
+  /// - Parameters: char
+  /// - Returns: numeric value or 10 to 35 for A-Z or -2 for fractions or -1 for all others
+  public static func getNumericValue (_ char : Character) -> Int {
+    switch char {
+    case "0" : return 0
+    case "1" : return 1
+    case "2" : return 2
+    case "3" : return 3
+    case "4" : return 4
+    case "5" : return 5
+    case "6" : return 6
+    case "7" : return 7
+    case "8" : return 8
+    case "9" : return 9
+    case "A", "a", "\u{FF21}", "\u{FF41}" : return 10
+    case "B", "b", "\u{FF22}", "\u{FF42}" : return 11
+    case "C", "c", "\u{FF23}", "\u{FF43}" : return 12
+    case "D", "d", "\u{FF24}", "\u{FF44}" : return 13
+    case "E", "e", "\u{FF25}", "\u{FF45}" : return 14
+    case "F", "f", "\u{FF26}", "\u{FF46}" : return 15
+    case "G", "g", "\u{FF27}", "\u{FF47}" : return 16
+    case "H", "h", "\u{FF28}", "\u{FF48}" : return 17
+    case "I", "i", "\u{FF29}", "\u{FF49}" : return 18
+    case "J", "j", "\u{FF2A}", "\u{FF4A}" : return 19
+    case "K", "k", "\u{FF2B}", "\u{FF4B}" : return 20
+    case "L", "l", "\u{FF2C}", "\u{FF4C}" : return 21
+    case "M", "m", "\u{FF2D}", "\u{FF4D}" : return 22
+    case "N", "n", "\u{FF2E}", "\u{FF4E}" : return 23
+    case "O", "o", "\u{FF2F}", "\u{FF4F}" : return 24
+    case "P", "p", "\u{FF30}", "\u{FF50}" : return 25
+    case "Q", "q", "\u{FF31}", "\u{FF51}" : return 26
+    case "R", "r", "\u{FF32}", "\u{FF52}" : return 27
+    case "S", "s", "\u{FF33}", "\u{FF53}" : return 28
+    case "T", "t", "\u{FF34}", "\u{FF54}" : return 29
+    case "U", "u", "\u{FF35}", "\u{FF55}" : return 30
+    case "V", "v", "\u{FF36}", "\u{FF56}" : return 31
+    case "W", "w", "\u{FF37}", "\u{FF57}" : return 32
+    case "X", "x", "\u{FF38}", "\u{FF58}" : return 33
+    case "Y", "y", "\u{FF39}", "\u{FF59}" : return 34
+    case "Z", "z", "\u{FF3A}", "\u{FF5A}" : return 35
+    // fractions
+    case "\u{00BC}", "\u{00BD}", "\u{00BE}" : return -2
+    case "\u{2150}", "\u{2151}", "\u{2152}",
+      "\u{2153}", "\u{2154}", "\u{2155}",
+      "\u{2156}", "\u{2157}", "\u{2158}",
+      "\u{2159}", "\u{215A}", "\u{215B}",
+      "\u{215C}", "\u{215D}", "\u{215E}" : return -2
+    case "\u{215F}" : return 1
+    case "\u{2189}" : return 0
+    default:
+      if let number = char.wholeNumberValue {
+        return number
+      }
+      return -1
+    }
+  }
 }

Tests/JavApiTests/JavApi_lang_Character_Tests.swift

@@ -28,7 +28,17 @@ final class JavApi_lang_Character_Tests: XCTestCase {
 
     let aValue = 65
     XCTAssertTrue(Character.isLetter(aValue))
-
+  }
+  
+  func testGetNumericValue () {
+    let A : Character = "A"
+    XCTAssertTrue(10 == Character.getNumericValue(A))
+    
+    let _1fract : Character = "\u{215f}"
+    XCTAssertTrue(1 == Character.getNumericValue(_1fract))
+    
+    let _1fract4 : Character = "\u{00BC}"
+    XCTAssertTrue(-2 == Character.getNumericValue(_1fract4))
   }
 
 }