//
//  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,
    MPFactorialToken,
    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