// --------------------------------------------------------------------------
//
// Copyright (c) Microsoft Corporation. All rights reserved.
//
// The MIT License (MIT)
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the ""Software""), to
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import Foundation
import SwiftSyntax

enum SpacingKind {
    /// Leading space
    case Leading
    /// Trailing space
    case Trailing
    /// Leading and trailing space
    case Both
    /// No spacing
    case Neither
}

extension SwiftSyntax.TokenKind {
    var spacing: SpacingKind {
        switch self {
        case .anyKeyword: return .Neither
        case .nilKeyword: return .Neither
        case .prefixPeriod: return .Leading
        case .comma: return .Trailing
        case .colon: return .Trailing
        case .semicolon: return .Trailing
        case .equal: return .Both
        case .arrow: return .Both
        case .leftBrace: return .Leading
        case .initKeyword: return .Leading
        case .wildcardKeyword: return .Neither
        case let .contextualKeyword(val):
            switch val {
            case "lowerThan", "higherThan", "associativity": return .Neither
            case "available", "unavailable", "introduced", "deprecated", "obsoleted", "message", "renamed": return .Neither
            case "willSet", "didSet", "get", "set":
                return .Both
            default: return .Both
            }
        default:
            return self.isKeyword ? .Both : .Neither
        }
    }
}
