60 lines
1.1 KiB
Objective-C
60 lines
1.1 KiB
Objective-C
//
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// MPUnidentifiedSymbolValue.m
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// MathPad
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//
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// Created by Kim Wittenburg on 11.10.14.
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// Copyright (c) 2014 Kim Wittenburg. All rights reserved.
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//
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#import "MPUnexpectedSymbolValue.h"
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@implementation MPUnexpectedSymbolValue {
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NSRange _range;
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}
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- (instancetype)init
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{
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self = [super init];
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if (self) {
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}
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return self;
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}
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- (instancetype)initWithTokenStream:(MPTokenStream *)tokenStream
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{
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self = [self init];
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if (self) {
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[tokenStream beginIgnoringWhitespaceTokens];
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_range = tokenStream.currentToken.range;
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_symbol = tokenStream.currentToken.stringValue;
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[tokenStream currentTokenConsumed];
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[tokenStream endIgnoringOrAcceptingWhitespaceTokens];
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}
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return self;
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}
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- (NSRange)range
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{
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return _range;
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}
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- (BOOL)validate:(MPParseError *__autoreleasing *)error
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{
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if (error) {
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*error = MPParseError(self.range, @"Unknown Symbol.");
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}
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return NO;
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}
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- (NSDecimalNumber *)evaluate
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{
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return [NSDecimalNumber notANumber];
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}
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- (NSArray *)expressionElements
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{
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return @[self.symbol];
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}
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@end
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