From 6874324d00f4872f50fbe620638f269d7f4c73ca Mon Sep 17 00:00:00 2001
From: Kim Wittenburg <Kim.Wittenburg@me.com>
Date: Fri, 18 Apr 2014 16:46:25 +0200
Subject: [PATCH] Added MPExpression and MPFunction Interfaces

---
 MathPad/MPExpression.h | 103 +++++++++++++++++++++++++++++++++++++++++
 MathPad/MPFunction.h   |  47 +++++++++++++++++++
 2 files changed, 150 insertions(+)
 create mode 100644 MathPad/MPExpression.h
 create mode 100644 MathPad/MPFunction.h

diff --git a/MathPad/MPExpression.h b/MathPad/MPExpression.h
new file mode 100644
index 0000000..204c1bd
--- /dev/null
+++ b/MathPad/MPExpression.h
@@ -0,0 +1,103 @@
+//
+//  MPExpression.h
+//  MathPad
+//
+//  Created by Kim Wittenburg on 17.04.14.
+//  Copyright (c) 2014 Kim Wittenburg. All rights reserved.
+//
+
+@class MPExpression, MPFunction;
+
+@interface MPExpression : NSObject <NSCopying, NSMutableCopying, NSCoding>
+
+#pragma mark Creation Methods
+
+- (instancetype)initWithSymbols:(NSArray *)symbols;
+
+#pragma mark Primitive Methods
+
+- (NSUInteger)numberOfSymbols;
+- (id)symbolAtIndex:(NSUInteger)index; // Either an NSString or a MPFunction
+
+- (double)doubleValue; // Evaluates Expression
+
+@end
+
+@interface MPExpression (MPExpressionExtensionMethods)
+
+#pragma mark Creation Methods
+
+- (id)init;
+- (instancetype)initWithString:(NSString *)aString;
+- (instancetype)initWithFunction:(MPFunction *)aFunction;
+
+
++ (instancetype)expression;
++ (instancetype)expressionWithString:(NSString *)aString;
++ (instancetype)expressionWithFunction:(MPFunction *)aFunction;
++ (instancetype)expressionWithSymbols:(NSArray *)symbols;
+
+#pragma mark Working with Expressions
+
+- (NSUInteger)length;
+
+- (MPExpression *)subexpressionFromIndex:(NSUInteger)from;
+- (MPExpression *)subexpressionToIndex:(NSUInteger)to;
+- (MPExpression *)subexpressionWithRange:(NSRange)range;
+
+- (BOOL)isEqualToExpression:(MPExpression *)anExpression;
+
+// TODO: prefix and suffix operator
+/*
+- (BOOL)hasPrefix:(NSString *)aString;
+- (BOOL)hasSuffix:(NSString *)aString;
+*/
+
+- (MPExpression *)expressionByAppendingString:(NSString *)aString;
+- (MPExpression *)expressionByAppendingFunction:(MPFunction *)aFunction;
+- (MPExpression *)expressionByAppendingExpression:(MPExpression *)anExpression;
+- (MPExpression *)expressionByAppendingSymbols:(NSArray *)symbols;
+
+#pragma mark Evaluating Expressions
+
+- (float)floatValue;
+- (int)intValue;
+- (NSInteger)integerValue;
+- (long long)longLongValue;
+
+#pragma mark Querying an Expression's Contents
+
+- (NSArray *)symbols;
+
+- (NSString *)description;
+
+- (NSUInteger)hash;
+
+@end
+
+@interface MPMutableExpression : MPExpression
+
+- (void)replaceSymbolsInRange:(NSRange)range withExpression:(MPExpression *)anExpression;
+
+@end
+
+@interface MPMutableExpression (MPMutableExpressionExtensionMethods)
+
+- (void)insertString:(NSString *)aString atIndex:(NSUInteger)loc;
+- (void)insertFunction:(MPFunction *)aFunction atIndex:(NSUInteger)loc;
+- (void)insertExpression:(MPExpression *)anExpression atIndex:(NSUInteger)loc;
+- (void)insertSymbols:(NSArray *)symbols atIndex:(NSUInteger)loc;
+
+- (void)deleteSymbolsInRange:(NSRange)range;
+
+- (void)appendString:(NSString *)aString;
+- (void)appendFunction:(MPFunction *)aFunction;
+- (void)appendExpression:(MPExpression *)anExpression;
+- (void)appendSymbols:(NSArray *)symbols;
+
+- (void)setString:(NSString *)aString;
+- (void)setFunction:(MPFunction *)aFunction;
+- (void)setExpression:(MPExpression *)anExpression;
+- (void)setSymbols:(NSArray *)symbols;
+
+@end
diff --git a/MathPad/MPFunction.h b/MathPad/MPFunction.h
new file mode 100644
index 0000000..e1ccc1c
--- /dev/null
+++ b/MathPad/MPFunction.h
@@ -0,0 +1,47 @@
+//
+//  MPFunction.h
+//  MathPad
+//
+//  Created by Kim Wittenburg on 18.04.14.
+//  Copyright (c) 2014 Kim Wittenburg. All rights reserved.
+//
+
+@class MPFunction, MPExpression;
+
+@interface MPFunction : NSObject
+
+#pragma mark Creation Methods
+
+- (instancetype)init;
+
+#pragma mark Children
+
+- (NSUInteger)numberOfChildren;
+- (MPExpression *)childAtIndex;
+- (void)setChild:(MPExpression *)child atIndex:(NSUInteger)index;
+
+#pragma mark Evaluating Functions
+
+- (double)doubleValue;
+
+@end
+
+@interface MPFunction (MPFunctionExtensionMethods)
+
+#pragma mark Children
+
+- (NSArray *)children;
+
+#pragma mark Evaluating Expressions
+
+- (float)floatValue;
+- (int)intValue;
+- (NSInteger)integerValue;
+- (long long)longLongValue;
+- (NSString *)stringValue;
+
+- (NSString *)description;
+
+- (NSUInteger)hash;
+
+@end