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Implemented Expression Evaluation/Parsing with Proper Error Handling

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Kim Wittenburg
2014-09-11 22:17:29 +02:00
parent f791213127
commit 245468a559
16 changed files with 670 additions and 330 deletions
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27
MathPad/MPElementParser.h
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@@ -2,17 +2,36 @@
// MPElementParser.h
// MathPad
//
// Created by Kim Wittenburg on 06.09.14.
// Created by Kim Wittenburg on 10.09.14.
// Copyright (c) 2014 Kim Wittenburg. All rights reserved.
//
#import <Foundation/Foundation.h>
#import "MPParsedElement.h"
#import "MPParsedProduct.h"
#import "MPParseError.h"
#define MPMaximumOperatorChainLength NSUIntegerMax
@interface MPElementParser : NSObject
- (MPParsedElement *)parseElement:(NSString *)string error:(MPParseError *__autoreleasing *)error;
+ (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:(MPParsedFactor *)nextFactor
definesVariable:(BOOL)flag
definedVariable:(NSString *__autoreleasing *)variableName
error:(out MPParseError *__autoreleasing *)error;
- (NSArray *)parseElement:(NSString *)string
previousProduct:(MPParsedProduct *)previousProduct
nextFactor:(MPParsedFactor *)nextFactor
error:(out MPParseError *__autoreleasing *)error;
@end