//
//  MPUnidentifiedSymbolValue.m
//  MathPad
//
//  Created by Kim Wittenburg on 11.10.14.
//  Copyright (c) 2014 Kim Wittenburg. All rights reserved.
//

#import "MPUnexpectedSymbolValue.h"

@implementation MPUnexpectedSymbolValue

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

- (instancetype)initWithTokenStream:(MPTokenStream *)tokenStream
{
    self = [self init];
    if (self) {
        [tokenStream beginIgnoringWhitespaceTokens];
        _symbol = tokenStream.currentToken.stringValue;
        [tokenStream currentTokenConsumed];
        [tokenStream endIgnoringOrAcceptingWhitespaceTokens];
    }
    return self;
}

- (BOOL)validate:(NSError *__autoreleasing *)error
{
    if (error) {
        *error = MPParseError(10,
                              NSLocalizedString(@"Unknown Symbol.", @"Error message. Displayed when an unknown symbol was encountered during parsing."),
                              nil);
    }
    return NO;
}

- (NSDecimalNumber *)evaluate
{
    return [NSDecimalNumber notANumber];
}

- (NSArray *)expressionElements
{
    return @[self.symbol];
}

@end