mathpad/MathPad/MPToken.m

//
//  MPToken.m
//  MathPad
//
//  Created by Kim Wittenburg on 19.09.14.
//  Copyright (c) 2014 Kim Wittenburg. All rights reserved.
//

#import "MPToken.h"

@implementation MPToken {
    NSRange _range;
    MPTokenType _tokenType;
    NSString *_stringValue;
}

- (instancetype)initEOFTokenAtLocation:(NSUInteger)eofLocation
{
    self = [super init];
    if (self) {
        _range = NSMakeRange(eofLocation, 0);
    }
    return self;
}

- (instancetype)initWithRange:(NSRange)range stringValue:(NSString *)input
{
    self = [super init];
    if (self) {
        _range = range;
        _stringValue = input.copy;
    }
    return self;
}

- (instancetype)initWithTokenType:(MPTokenType)tokenType
                            range:(NSRange)range
                      stringValue:(NSString *)input
{
    self = [self initWithRange:range
                   stringValue:input];
    if (self) {
        _tokenType = tokenType;
    }
    return self;
}

- (NSRange)range
{
    return _range;
}

- (MPTokenType)tokenType
{
    return _tokenType;
}

- (NSString *)stringValue
{
    return _stringValue;
}

- (NSString *)description
{
    return self.stringValue;
}

@end


@implementation MPToken (MPTokenExtension)

- (NSUInteger)numberOfOperators
{
    NSString *operatorString = [[self.stringValue componentsSeparatedByString:@" "] componentsJoinedByString:@""];
    return operatorString.length;
}

- (NSDecimalNumber *)operatorValue
{
    NSString *operatorString = [[self.stringValue componentsSeparatedByString:@" "] componentsJoinedByString:@""];
    NSDecimalNumber *value = [NSDecimalNumber one];
    for (NSUInteger charIndex = 0; charIndex < operatorString.length; charIndex++) {
        NSString *operator = [operatorString substringWithRange:NSMakeRange(charIndex, 1)];
        if ([operator isEqualToString:@"-"]) {
            value = [value decimalNumberByMultiplyingBy:[[NSDecimalNumber alloc] initWithInteger:-1]];
        }
    }
    return value;
}

- (NSDecimalNumber *)number
{
    return [NSDecimalNumber decimalNumberWithString:self.stringValue
                                             locale:[NSLocale currentLocale]];
}

- (NSString *)variable
{
    return self.stringValue;
}


@end