23 lines
777 B
Swift
23 lines
777 B
Swift
/**
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* Splash
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* Copyright (c) John Sundell 2018
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* MIT license - see LICENSE.md
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*/
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import Foundation
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/// Protocol used to define syntax rules for a language `Grammar`.
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/// Each rule is associated with a certain `TokenType` and, when
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/// evaluated, is asked to check whether it matches a given segment
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/// of code. If the rule matches then the rule's token type will be
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/// associated with the given segment's current token.
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public protocol SyntaxRule {
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/// The token type that this syntax rule represents
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var tokenType: TokenType { get }
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/// Determine if the syntax rule matches a given segment. If it's
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/// a match, then the rule's `tokenType` will be associated with
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/// the segment's current token.
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func matches(_ segment: Segment) -> Bool
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}
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