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

import Foundation

public enum Keyword: Codable, Equatable, Sendable {
	case `import`
	case theory
	case `where`
}

public enum Whitespace: Codable, Equatable, Sendable {
	case newline
	case other
}

public enum TokenKind: Codable, Equatable, Sendable {
  case eof
	case keyword(Keyword)
	case error
	case identifier
	case whitespace(Whitespace)
	case blockBegin
	case blockEnd
	case blockSep
}

public final class SyntaxTreeKind: Codable, Equatable, Sendable {
	static let error: SyntaxTreeKind = .init(name: "error")
	
	public static func == (lhs: SyntaxTreeKind, rhs: SyntaxTreeKind) -> Bool {
		lhs === rhs
	}
	
	let name: String
	var description: String { name }
	
	required init(name: String) {
		self.name = name
	}
}

public struct TokenMetadata: Codable, Equatable, Sendable {
}

public struct SyntaxTreeMetadata: Codable, Equatable, Sendable {
  
}

extension TokenKind {
	var canDetermineLayoutColumn: Bool {
		switch self {
		case .whitespace, .eof: false
		default: true
		}
	}
	
	var isBlockHerald: Bool {
		switch self {
		case .keyword(.where): true
		default: false 
		}
	}
}