Fundamental Redesign of Evaluation

MathPad/MPFractionFunction.m

@@ -8,8 +8,8 @@
 
 #import "MPFractionFunction.h"
 
+#import "MPFractionTerm.h"
 #import "MPExpression.h"
-#import "MPExpressionTree.h"
 
 @implementation MPFractionFunction
 
@@ -21,14 +21,9 @@ MPFunctionAccessorImplementation(DenominatorExpression, _denominatorExpression)
     return @[@"nominatorExpression", @"denominatorExpression"];
 }
 
-- (BOOL)validate:(NSError *__autoreleasing *)error
+- (Class)functionTermClass
 {
-    return [[self.nominatorExpression parse] validate:error] && [[self.denominatorExpression parse] validate:error];
-}
-
-- (NSDecimalNumber *)evaluate
-{
-    return [[[self.nominatorExpression parse] evaluate] decimalNumberByDividingBy:[[self.denominatorExpression parse] evaluate]];
+    return [MPFractionTerm class];
 }
 
 - (NSString *)description