//
//  MPNumber.m
//  MathPad
//
//  Created by Kim Wittenburg on 09.10.14.
//  Copyright (c) 2014 Kim Wittenburg. All rights reserved.
//

#import "MPNumber.h"

@implementation MPNumber {
    NSRange _range;
}

- (instancetype)init
{
    self = [super init];
    if (self) {
    }
    return self;
}

- (instancetype)initWithTokenStream:(MPTokenStream *)tokenStream
{
    self = [self init];
    if (self) {
        [tokenStream beginIgnoringWhitespaceTokens];
        MPToken *token = tokenStream.currentToken;
        if (token.tokenType == MPNumberToken) {
            self.number = [NSDecimalNumber decimalNumberWithString:token.stringValue locale:[NSLocale currentLocale]];
            _range = token.range;
        } else {
            @throw [NSException exceptionWithName:NSInternalInconsistencyException reason:@"Expected Number" userInfo:nil];
        }
        [tokenStream currentTokenConsumed];
        [tokenStream endIgnoringOrAcceptingWhitespaceTokens];
    }
    return self;
}

- (NSRange)range
{
    return _range;
}

- (BOOL)validate:(MPParseError *__autoreleasing *)error
{
    return YES;
}

- (NSDecimalNumber *)evaluate
{
    return self.number;
}

- (NSArray *)expressionElements
{
    return @[[self.number descriptionWithLocale:[NSLocale currentLocale]]];
}

@end