File: GraphLoadingNode.swift

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//===----------------------------------------------------------------------===//
//
// This source file is part of the Swift open source project
//
// Copyright (c) 2014-2020 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See http://swift.org/LICENSE.txt for license information
// See http://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
//
//===----------------------------------------------------------------------===//

import Basics
import PackageLoading
import PackageModel

/// A node used while loading the packages in a resolved graph.
///
/// This node uses the product filter that was already finalized during resolution.
///
/// - SeeAlso: ``DependencyResolutionNode``
public struct GraphLoadingNode: Equatable, Hashable {
    /// The package identity.
    public let identity: PackageIdentity

    /// The package manifest.
    public let manifest: Manifest

    /// The product filter applied to the package.
    public let productFilter: ProductFilter

    /// The enabled traits for this package.
    package var enabledTraits: Set<String>

    public init(
        identity: PackageIdentity,
        manifest: Manifest,
        productFilter: ProductFilter,
        enabledTraits: Set<String>
    ) throws {
        self.identity = identity
        self.manifest = manifest
        self.productFilter = productFilter
        self.enabledTraits = enabledTraits
    }

    /// Returns the dependencies required by this node.
    var requiredDependencies: [PackageDependency] {
        guard let requiredDeps = try? self.manifest.dependenciesRequired(for: self.productFilter, enabledTraits) else {
            return []
        }
        return requiredDeps
    }

    var traitGuardedDependencies: [PackageDependency] {
        self.manifest.dependenciesTraitGuarded(withEnabledTraits: self.enabledTraits)
    }
}

extension GraphLoadingNode: CustomStringConvertible {
    public var description: String {
        switch self.productFilter {
        case .everything:
            self.identity.description
        case .specific(let set):
            "\(self.identity.description)[\(set.sorted().joined(separator: ", "))]"
        }
    }
}