SwiftLint/Source/SwiftLintBuiltInRules/Rules/RuleConfigurations/StatementPositionConfiguration.swift

import SwiftLintCore

struct StatementPositionConfiguration: SeverityBasedRuleConfiguration, Equatable {
    typealias Parent = StatementPositionRule

    enum StatementModeConfiguration: String, AcceptableByConfigurationElement {
        case `default` = "default"
        case uncuddledElse = "uncuddled_else"

        init(value: Any) throws {
            if let string = (value as? String)?.lowercased(),
               let value = Self(rawValue: string) {
                self = value
            } else {
                throw Issue.unknownConfiguration(ruleID: Parent.identifier)
            }
        }

        func asOption() -> OptionType { .symbol(rawValue) }
    }

    @ConfigurationElement(key: "severity")
    private(set) var severityConfiguration = SeverityConfiguration<Parent>.warning
    @ConfigurationElement(key: "statement_mode")
    private(set) var statementMode = StatementModeConfiguration.default

    mutating func apply(configuration: Any) throws {
        guard let configurationDict = configuration as? [String: Any] else {
            throw Issue.unknownConfiguration(ruleID: Parent.identifier)
        }
        if let statementModeConfiguration = configurationDict[$statementMode] {
            try statementMode = StatementModeConfiguration(value: statementModeConfiguration)
        }
        if let severity = configurationDict[$severityConfiguration] {
            try severityConfiguration.apply(configuration: severity)
        }
    }
}