//
//  Pair.swift
//  Troll
//
// Copyright (c) 2021 BlueDino Software (https://bluedino.net)
// Redistribution and use in source and binary forms, with or without modification,
// are permitted provided that the following conditions are met:
// 1. Redistributions of source code must retain the above copyright notice, this
//    list of conditions and the following disclaimer.
// 2. Redistributions in binary form must reproduce the above copyright notice,
//    this list of conditions and the following disclaimer in the documentation and/or
//    other materials provided with the distribution.
// 3. Neither the name of the copyright holder nor the names of its contributors may be
//    used to endorse or promote products derived from this software without specific prior
//    written permission.
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
// THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
// OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
// HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
// TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

import Foundation

public class Pair: Expr {
    public let first: Expr
    public let second: Expr

    public init(first: Expr, second: Expr) {
        self.first = first
        self.second = second
    }

    public func evaluate(interpreter: Interpreter) throws -> Value {
        let f = try first.evaluate(interpreter: interpreter)
        let s = try second.evaluate(interpreter: interpreter)

        return .pair(f, s)
    }
}

extension Pair: CustomStringConvertible {
    public var description: String {
        return "[ \(first), \(second) ]"
    }
}
