Improved Evaluation

MathPad/MPToken.h

@@ -0,0 +1,60 @@
+//
+//  MPToken.h
+//  MathPad
+//
+//  Created by Kim Wittenburg on 19.09.14.
+//  Copyright (c) 2014 Kim Wittenburg. All rights reserved.
+//
+
+#import <Foundation/Foundation.h>
+
+typedef NS_ENUM(NSUInteger, MPTokenType) {
+    MPEOFToken = 0,
+    MPMultiplicationSymbolToken,
+    MPOperatorListToken,
+    MPSinToken,
+    MPCosToken,
+    MPTanToken,
+    MPNumberToken,
+    MPVariableToken,
+    MPEqualsToken,
+    MPGenericFunctionToken,
+    
+    MPWhitespaceToken,
+    MPUnidentifiedToken,
+    
+    MPCompoundToken
+};
+
+
+@protocol MPToken <NSObject>
+
+- (MPTokenType)tokenType;
+
+- (NSRange)range;
+- (NSString *)stringValue;
+
+@end
+
+
+@interface MPToken : NSObject <MPToken>
+
+- (instancetype)initEOFTokenAtLocation:(NSUInteger)eofLocation;
+- (instancetype)initWithRange:(NSRange)range inString:(NSString *)input;
+- (instancetype)initWithTokenType:(MPTokenType)tokenType
+                            range:(NSRange)range
+                     inString:(NSString *)input;
+
+@end
+
+@interface MPToken (MPTokenExtension)
+// Methods are only available for respective token type
+
+- (NSUInteger)numberOfOperators;
+- (NSDecimalNumber *)operatorValue;
+
+- (NSDecimalNumber *)number;
+
+- (NSString *)variable;
+
+@end