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//===--- SubstitutionMap.swift --------------------------------------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2024 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See https://swift.org/LICENSE.txt for license information
// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
//
//===----------------------------------------------------------------------===//
import Basic
import ASTBridging
/// SubstitutionMap describes the mapping of abstract types to replacement types,
/// together with associated conformances to use for deriving nested types and conformances.
///
/// Substitution maps are primarily used when performing substitutions into any entity that
/// can reference type parameters and conformances.
public struct SubstitutionMap: CustomStringConvertible {
public let bridged: BridgedSubstitutionMap
public init(bridged: BridgedSubstitutionMap) {
self.bridged = bridged
}
public init() {
self.bridged = BridgedSubstitutionMap()
}
public var description: String {
return String(taking: bridged.getDebugDescription())
}
public var isEmpty: Bool { bridged.isEmpty() }
public var hasAnySubstitutableParams: Bool { bridged.hasAnySubstitutableParams() }
public var conformances: ConformanceArray { ConformanceArray(substitutionMap: self) }
public struct ConformanceArray : BridgedRandomAccessCollection {
fileprivate let bridgedSubs: BridgedSubstitutionMap
public let count: Int
init(substitutionMap: SubstitutionMap) {
self.bridgedSubs = substitutionMap.bridged
self.count = substitutionMap.bridged.getNumConformances()
}
public var startIndex: Int { return 0 }
public var endIndex: Int { return count }
public subscript(_ index: Int) -> Conformance {
assert(index >= startIndex && index < endIndex)
return Conformance(bridged: bridgedSubs.getConformance(index))
}
}
}
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