Fundamental Redesign of Evaluation

MathPad/MPPowerFunction.m

@@ -9,9 +9,6 @@
 #import "MPPowerFunction.h"
 
 #import "MPExpression.h"
-#import "MPExpressionTree.h"
-
-#import "MPValueGroup.h"
 
 @implementation MPPowerFunction
 
@@ -22,30 +19,6 @@ MPFunctionAccessorImplementation(ExponentExpression, _exponentExpression)
     return @[@"exponentExpression"];
 }
 
-- (BOOL)validate:(NSError *__autoreleasing *)error
-{
-    if (!self.baseValue) {
-        if (error) {
-            *error = MPParseError(11,
-                                  NSLocalizedString(@"No Base For Power.", @"Error message. This is displayed when a power does not have a base value."),
-                                  nil);
-        }
-        return NO;
-    }
-    return [self.baseValue validate:error] && [[self.exponentExpression parse] validate:error];
-}
-
-- (NSDecimalNumber *)evaluate
-{
-    NSDecimalNumber *base = [self.baseValue evaluate];
-    NSDecimalNumber *exponent = [[self.exponentExpression parse] evaluate];
-    if ([base isEqualToNumber:@(0)] && [exponent isEqualToNumber:@(0)]) {
-        // The C pow function returns 1 for pow(0, 0). Mathematically this should be undefined.
-        return [NSDecimalNumber notANumber];
-    }
-    return [[NSDecimalNumber alloc] initWithDouble:pow(base.doubleValue, exponent.doubleValue)];
-}
-
 - (NSString *)description
 {
     return [NSString stringWithFormat:@"^%@", self.exponentExpression.description];