//
//  MPElementParser.h
//  MathPad
//
//  Created by Kim Wittenburg on 10.09.14.
//  Copyright (c) 2014 Kim Wittenburg. All rights reserved.
//

#import <Foundation/Foundation.h>
#import "MPParsedProduct.h"
#import "MPParseError.h"

#define MPMaximumOperatorChainLength NSUIntegerMax

@interface MPElementParser : NSObject

+ (BOOL)isUsingDefaultValuesFromUserDefaults;
+ (void)setUsingDefaultValuesFromUserDefaults:(BOOL)flag;

@property (nonatomic) BOOL allowsImplicitMultiplications; // wether 2 3 is equal to 6 or error
// Default value uses the key "..." in NSUserDefaults or ... if the key does not exist.
@property (nonatomic) NSUInteger maximumOperatorChainLength; // +--++-5 -> Chain length: 6, 2 default (sign of number and operator) (0 is invalid?)
@property (nonatomic) NSUInteger maximumOperatorChainLengthInMultiplication; // Default: 1, 0 means actually 0
@property (nonatomic) NSUInteger maximumOperatorChainLengthInFunction; // For sin, cos, tan. Default: 1

- (NSArray *)parseElement:(NSString *)string
          previousProduct:(MPParsedProduct *)previousProduct
               nextFactor:(id<MPParsedFactor>)nextFactor
          definesVariable:(BOOL)flag
          definedVariable:(NSString *__autoreleasing *)variableName
                    error:(out MPParseError *__autoreleasing *)error;
- (NSArray *)parseElement:(NSString *)string
          previousProduct:(MPParsedProduct *)previousProduct
               nextFactor:(id<MPParsedFactor>)nextFactor
                    error:(out MPParseError *__autoreleasing *)error;

@end