// SPDX-FileCopyrightText: 2025 The Project Pterodactyl Developers
//
// SPDX-License-Identifier: MPL-2.0

import Foundation

public protocol Grammar: Sendable {
	static var kinds: [SyntaxTreeKind] { get }
	static func before(_ parser: inout Parser) -> Bool
	static func inside(_ parser: inout Parser) -> ParseResult
}

public struct ParseResult {
	public var kind: SyntaxTreeKind
	public var metadata: SyntaxTreeMetadata? = nil
	
	public init(kind: SyntaxTreeKind, metadata: SyntaxTreeMetadata? = nil) {
		self.kind = kind
		self.metadata = metadata
	}
}


public extension Grammar {
	static func tryParse(_ parser: inout Parser) -> Bool {
		guard !parser.isEndOfFile && before(&parser) else { return false }
		parse(&parser)
		return true
	}
	
	static func parse(_ parser: inout Parser) {
		let mark = parser.open()
		let result = inside(&parser)
		parser.close(mark: mark, kind: result.kind, metadata: result.metadata)
	}
}