MLKCharacter: Add methods for character case conversion.

3 files changed, 48 insertions, 10 deletions

diff --git a/MLKCharacter.h b/MLKCharacter.h
index 664803a..04049d4 100644
--- a/MLKCharacter.h
+++ b/MLKCharacter.h
@@ -26,7 +26,16 @@
   unichar unichar;
 }
 
--(MLKCharacter*) initWithUnichar:(unichar)anUnichar;
+-(MLKCharacter *) initWithUnichar:(unichar)anUnichar;
 
-+(MLKCharacter*) characterWithUnichar:(unichar)anUnichar;
++(MLKCharacter *) characterWithUnichar:(unichar)anUnichar;
+
+-(MLKCharacter *) uppercaseCharacter;
+-(MLKCharacter *) lowercaseCharacter;
+
+-(unichar) uppercaseChar;
+-(unichar) lowercaseChar;
+
++(unichar) uppercaseCharForChar:(unichar)ch;
++(unichar) lowercaseCharForChar:(unichar)ch;
 @end
diff --git a/MLKCharacter.m b/MLKCharacter.m
index c653248..5daa22c 100644
--- a/MLKCharacter.m
+++ b/MLKCharacter.m
@@ -31,4 +31,36 @@
 {
   return [[MLKCharacter alloc] initWithUnichar:anUnichar];
 }
+
+-(MLKCharacter *) uppercaseCharacter
+{
+  return [MLKCharacter characterWithUnichar:[self uppercaseChar]];
+}
+
+-(MLKCharacter *) lowercaseCharacter
+{
+  return [MLKCharacter characterWithUnichar:[self lowercaseChar]];
+}
+
+-(unichar) uppercaseChar
+{
+  return [[[NSString stringWithFormat:@"%C", self->unichar] uppercaseString]
+           characterAtIndex:0];
+}
+
+-(unichar) lowercaseChar
+{
+  return [[[NSString stringWithFormat:@"%C", self->unichar] lowercaseString]
+           characterAtIndex:0];
+}
+
++(unichar) uppercaseCharForChar:(unichar)ch
+{
+  return [[MLKCharacter characterWithUnichar:ch] uppercaseChar];
+}
+
++(unichar) lowercaseCharForChar:(unichar)ch
+{
+  return [[MLKCharacter characterWithUnichar:ch] lowercaseChar];
+}
 @end
diff --git a/MLKReadtable.m b/MLKReadtable.m
index 59f6438..702a00b 100644
--- a/MLKReadtable.m
+++ b/MLKReadtable.m
@@ -17,6 +17,7 @@
  */
 
 #import "MLKReadtable.h"
+#import "MLKCharacter.h"
 
 #import <Foundation/NSDictionary.h>
 #import <Foundation/NSValue.h>
@@ -114,19 +115,15 @@
     case MLKReadtableCase_PRESERVE:
       return ch;
     case MLKReadtableCase_UPCASE:
-      return [[[NSString stringWithFormat:@"%C", ch] uppercaseString]
-               characterAtIndex:0];
+      return [MLKCharacter uppercaseCharForChar:ch];
     case MLKReadtableCase_DOWNCASE:
-      return [[[NSString stringWithFormat:@"%C", ch] lowercaseString]
-               characterAtIndex:0];
+      return [MLKCharacter lowercaseCharForChar:ch];
     case MLKReadtableCase_INVERT:
       {
         unichar upCh;
-        upCh = [[[NSString stringWithFormat:@"%C", ch] uppercaseString]
-                characterAtIndex:0];
+        upCh = [MLKCharacter uppercaseCharForChar:ch];
         if (ch == upCh)
-          return [[[NSString stringWithFormat:@"%C", ch] lowercaseString]
-                   characterAtIndex:0];
+          return [MLKCharacter lowercaseCharForChar:ch];
         else
           return upCh;
       }