MathParser.h

//
//  MathParser.h
//  bcParserObjC
//
//  Created by Suavi Demir on 11/9/13.
//  Copyright (c) 2013 Suavi Demir. All rights reserved.
//

#import <Foundation/Foundation.h>

@protocol Function

-(double)run: (NSArray *)parameters;

-(int)getNumberOfParameters;
@end

@protocol Parameter
-(double)getValue;
@end

@protocol VariableDelegate

-(double) getVariableValue:(NSString *) varName;
@end

@interface ParserException : NSException
{
    NSString * m_InvalidPortion;
}
-(id)initWithMessage:(NSString *) message andInvalidPortion:(NSString *) invalid;
-(NSString *) getInvalidPortionOfExpression;
@end


@protocol Node<Parameter>
-(double) getValue;

-(BOOL) isVariableUsed:(NSString *)name;

-(BOOL) isFunctionUsed:(NSString *)name;

-(void) optimize;
@end

@interface MathParser : NSObject
{
    NSString *m_Expression;
    
    BOOL m_Dirty;
    
    BOOL m_OptimizationOn;
    
    NSObject<Node> *m_Node;
    
    NSMutableDictionary *m_Variables;
    
    NSMutableDictionary *m_Functions;
        
    // The locale to use for uppercasing and decimal points
    NSLocale *m_Locale;
    
    // If true, locale specific decimal separator will be used. If false, decimal separator to use is dot(.)
    BOOL m_LocaleSpecificDecimals;
    
    // An object that implements VariableDelegate protocol.
    NSObject<VariableDelegate> *m_VariableDelegate;
    
    // Decimal separator related internal values.
    char m_DecimalSeperatorChar;
    NSString *m_DecimalSeparatorStr;
    char m_FunctionParamSeparatorChar;
    NSString *m_FunctionParamSeparatorStr;
}

@property (nonatomic) NSString *expression;

@property (nonatomic, readonly) double value;

@property (nonatomic) BOOL precedingZerosAllowed;

@property (nonatomic) NSLocale *locale;

@property (nonatomic) BOOL localeSpecificDecimals;

@property (nonatomic) NSObject<VariableDelegate> *variableDelegate;

@property (nonatomic) NSDictionary * translationStrings;

@property (nonatomic) BOOL optimizationOn;

-(void) parse;

-(double) evaluate;

-(BOOL) isVariableUsed: (NSString *) varName;

-(BOOL) isFunctionUsed: (NSString *)funcName;

-(BOOL) isVariable:(NSString *) varName;

-(BOOL) isConstant:(NSString *) constName;

-(BOOL) isFunction:(NSString *) funcName;

-(void) setVariable: (NSString *) varName withNewValue: (double) newVal maybeConstant: (bool) isConst;

-(void) setVariable: (NSString *)varName withNewValue:(double) newVal;

-(void) createConstant:(NSString *)varName withValue:(double)newVal;

-(void) createFunc: (NSString *)newFuncName withImpl: (NSObject<Function> *) funcAddr;


-(void) createDefaultFuncs;

-(void) deleteVar: (NSString *) varName;

-(void) deleteFunc: (NSString *) funcName;


-(void) deleteAllVars;

-(void) deleteAllFuncs;

-(void) optimize;

-(NSArray *) getVariables;

-(NSArray *) getFunctions;

-(NSArray *) getVariablesUsed;

-(void) FreeParseTree;

@end