purchases-ios/Sources/RulesEngine/Operators/MiscOperators.swift

//
//  MiscOperators.swift
//
//  Created by Antonio Pallares.
//

import Foundation

extension RulesEngine {

    /// Miscellaneous operators: `log`.
    enum MiscOperators {

        /// `{"log": value}` — evaluates its single argument, emits it through the
        /// dedicated `log` channel of `RulesEngine.logger`, and returns it unchanged
        /// (identity passthrough).
        /// Mirrors json-logic-js `function(a){ console.log(a); return a; }`: a
        /// debug aid that never affects a rule's outcome. A missing argument is
        /// `undefined` (logged as `"undefined"`); operands beyond the first are
        /// ignored.
        static func opLog(args: Value, vars: Scope) throws -> Value {
            let value = try Operators.evalArgs(args, vars: vars).first ?? .undefined
            RulesEngine.logger.log(jsString(value))
            return value
        }
    }
}