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//===----------------------------------------------------------------------===//
//
// This source file is part of the Swift open source project
//
// Copyright (c) 2014-2023 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
//
//===----------------------------------------------------------------------===//
/// Namespace for build settings.
public enum BuildSettings {
/// Build settings declarations.
public struct Declaration: Hashable {
// Swift.
public static let SWIFT_ACTIVE_COMPILATION_CONDITIONS: Declaration =
.init("SWIFT_ACTIVE_COMPILATION_CONDITIONS")
public static let OTHER_SWIFT_FLAGS: Declaration = .init("OTHER_SWIFT_FLAGS")
public static let SWIFT_VERSION: Declaration = .init("SWIFT_VERSION")
// C family.
public static let GCC_PREPROCESSOR_DEFINITIONS: Declaration = .init("GCC_PREPROCESSOR_DEFINITIONS")
public static let HEADER_SEARCH_PATHS: Declaration = .init("HEADER_SEARCH_PATHS")
public static let OTHER_CFLAGS: Declaration = .init("OTHER_CFLAGS")
public static let OTHER_CPLUSPLUSFLAGS: Declaration = .init("OTHER_CPLUSPLUSFLAGS")
// Linker.
public static let OTHER_LDFLAGS: Declaration = .init("OTHER_LDFLAGS")
public static let LINK_LIBRARIES: Declaration = .init("LINK_LIBRARIES")
public static let LINK_FRAMEWORKS: Declaration = .init("LINK_FRAMEWORKS")
/// The declaration name.
public let name: String
private init(_ name: String) {
self.name = name
}
}
/// An individual build setting assignment.
public struct Assignment: Equatable, Hashable {
/// The assignment value.
public var values: [String]
public var conditions: [PackageCondition]
/// Indicates whether this assignment represents a default
/// that should be used only if no other assignments match.
public let `default`: Bool
public init(default: Bool = false) {
self.conditions = []
self.values = []
self.default = `default`
}
public init(values: [String] = [], conditions: [PackageCondition] = []) {
self.values = values
self.default = false // TODO(franz): Check again
self.conditions = conditions
}
}
/// Build setting assignment table which maps a build setting to a list of assignments.
public struct AssignmentTable {
public private(set) var assignments: [Declaration: [Assignment]]
public init() {
self.assignments = [:]
}
/// Add the given assignment to the table.
public mutating func add(_ assignment: Assignment, for decl: Declaration) {
// FIXME: We should check for duplicate assignments.
self.assignments[decl, default: []].append(assignment)
}
}
/// Provides a view onto assignment table with a given set of bound parameters.
///
/// This class can be used to get the assignments matching the bound parameters.
public struct Scope {
/// The assignment table.
public let table: AssignmentTable
/// The build environment.
public let environment: BuildEnvironment
public init(_ table: AssignmentTable, environment: BuildEnvironment) {
self.table = table
self.environment = environment
}
/// Evaluate the given declaration and return the values matching the bound parameters.
public func evaluate(_ decl: Declaration) -> [String] {
// Return nil if there is no entry for this declaration.
guard let assignments = table.assignments[decl] else {
return []
}
// Add values from each assignment if it satisfies the build environment.
let allViableAssignments = assignments
.lazy
.filter { $0.conditions.allSatisfy { $0.satisfies(self.environment) } }
let nonDefaultAssignments = allViableAssignments.filter { !$0.default }
// If there are no non-default assignments, let's fallback to defaults.
if nonDefaultAssignments.isEmpty {
return allViableAssignments.filter(\.default).flatMap(\.values)
}
return nonDefaultAssignments.flatMap(\.values)
}
}
}
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