Reorganized File Structure

Added Documentation

MathKit/MPFunctionTerm.m

@@ -0,0 +1,72 @@
+//
+//  MPFunctionTerm.m
+//  MathPad
+//
+//  Created by Kim Wittenburg on 12.11.14.
+//  Copyright (c) 2014 Kim Wittenburg. All rights reserved.
+//
+
+#import "MPFunctionTerm.h"
+
+#import "MPFunction.h"
+#import "MPExpression.h"
+#import "MPParsedExpression.h"
+
+#import "MPToken.h"
+
+
+
+@interface MPFunctionTerm ()
+
+@property (nonatomic, strong) NSArray *parsedExpressions;
+
+@end
+
+
+
+@implementation MPFunctionTerm
+
+- (instancetype)initWithFunction:(MPFunction *)function
+                          errors:(NSArray *__autoreleasing *)errors
+{
+    NSAssert(function != nil, @"function must not be nil.");
+    if ([self isMemberOfClass:[MPFunctionTerm class]]) {
+        return [[function.functionTermClass alloc] initWithFunction:function
+                                                             errors:errors];
+    }
+    self = [super init];
+    if (self) {
+        NSMutableArray *parsedExpressions = [[NSMutableArray alloc] initWithCapacity:function.childrenAccessors.count];
+        NSUInteger childIndex = 0;
+        BOOL errorOccured = NO;
+        NSMutableArray *mutableErrors = [[NSMutableArray alloc] init];
+        for (NSString *accessor in function.childrenAccessors) {
+            MPExpression *expression = [function valueForKey:accessor];
+            NSArray *localErrors;
+            MPParsedExpression *parsedExpression = [expression parseExpectingVariable:[function expectsVariableDefinitionInChildAtIndex:childIndex]
+                                                                               errors:&localErrors];
+            if (parsedExpression) {
+                [parsedExpressions addObject:parsedExpression];
+            } else {
+                [mutableErrors addObjectsFromArray:localErrors];
+                errorOccured = YES;
+            }
+            childIndex++;
+        }
+        if (errorOccured) {
+            if (errors) {
+                *errors = mutableErrors;
+            }
+            return nil;
+        }
+        self.parsedExpressions = parsedExpressions;
+    }
+    return self;
+}
+
+- (MPParsedExpression *)expressionAtIndex:(NSUInteger)anIndex
+{
+    return [self.parsedExpressions objectAtIndex:anIndex];
+}
+
+@end