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//===----------------------------------------------------------------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2022-2023 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
//
//===----------------------------------------------------------------------===//
@available(FoundationPredicate 0.1, *)
extension PredicateExpressions {
public struct OptionalFlatMap<
LHS : PredicateExpression,
Wrapped,
RHS : PredicateExpression,
Result
> : PredicateExpression
where
LHS.Output == Optional<Wrapped>
{
public typealias Output = Optional<Result>
public let wrapped: LHS
public let transform: RHS
public let variable: Variable<Wrapped>
public init(_ wrapped: LHS, _ builder: (Variable<Wrapped>) -> RHS) where RHS.Output == Result {
self.wrapped = wrapped
self.variable = Variable()
self.transform = builder(variable)
}
public init(_ wrapped: LHS, _ builder: (Variable<Wrapped>) -> RHS) where RHS.Output == Optional<Result> {
self.wrapped = wrapped
self.variable = Variable()
self.transform = builder(variable)
}
public func evaluate(_ bindings: PredicateBindings) throws -> Output {
var mutableBindings = bindings
return try wrapped.evaluate(bindings).flatMap { inner in
mutableBindings[variable] = inner
return try transform.evaluate(mutableBindings) as! Result?
}
}
}
public static func build_flatMap<LHS, RHS, Wrapped, Result>(_ wrapped: LHS, _ builder: (Variable<Wrapped>) -> RHS) -> OptionalFlatMap<LHS, Wrapped, RHS, Result> where RHS.Output == Result {
OptionalFlatMap(wrapped, builder)
}
public static func build_flatMap<LHS, RHS, Wrapped, Result>(_ wrapped: LHS, _ builder: (Variable<Wrapped>) -> RHS) -> OptionalFlatMap<LHS, Wrapped, RHS, Result> where RHS.Output == Optional<Result> {
OptionalFlatMap(wrapped, builder)
}
public struct NilCoalesce<
LHS : PredicateExpression,
RHS : PredicateExpression
> : PredicateExpression
where
LHS.Output == Optional<RHS.Output>
{
public typealias Output = RHS.Output
public let lhs: LHS
public let rhs: RHS
public init(lhs: LHS, rhs: RHS) {
self.lhs = lhs
self.rhs = rhs
}
public func evaluate(_ bindings: PredicateBindings) throws -> Output {
try lhs.evaluate(bindings) ?? rhs.evaluate(bindings)
}
}
public static func build_NilCoalesce<LHS, RHS>(lhs: LHS, rhs: RHS) -> NilCoalesce<LHS, RHS> {
NilCoalesce(lhs: lhs, rhs: rhs)
}
public struct ForcedUnwrap<
Inner : PredicateExpression,
Wrapped
> : PredicateExpression
where
Inner.Output == Optional<Wrapped>
{
public typealias Output = Wrapped
public let inner: Inner
public init(_ inner: Inner) {
self.inner = inner
}
public func evaluate(_ bindings: PredicateBindings) throws -> Wrapped {
let input = try inner.evaluate(bindings)
if let result = input {
return result
}
throw PredicateError(.forceUnwrapFailure("Found nil when unwrapping value of type '\(type(of: input))'"))
}
}
public static func build_ForcedUnwrap<Inner, Wrapped>(_ inner: Inner) -> ForcedUnwrap<Inner, Wrapped> where Inner.Output == Optional<Wrapped> {
ForcedUnwrap(inner)
}
}
@available(FoundationPredicate 0.3, *)
extension PredicateExpressions.OptionalFlatMap : CustomStringConvertible {
public var description: String {
"OptionalFlatMap(wrapped: \(wrapped), variable: \(variable), transform: \(transform))"
}
}
@available(FoundationPredicate 0.3, *)
extension PredicateExpressions.NilCoalesce : CustomStringConvertible {
public var description: String {
"NilCoalesce(lhs: \(lhs), rhs: \(rhs))"
}
}
@available(FoundationPredicate 0.3, *)
extension PredicateExpressions.ForcedUnwrap : CustomStringConvertible {
public var description: String {
"ForcedUnwrap(inner: \(inner))"
}
}
@available(FoundationPredicate 0.1, *)
extension PredicateExpressions.OptionalFlatMap : StandardPredicateExpression where LHS : StandardPredicateExpression, RHS : StandardPredicateExpression {}
@available(FoundationPredicate 0.1, *)
extension PredicateExpressions.NilCoalesce : StandardPredicateExpression where LHS : StandardPredicateExpression, RHS : StandardPredicateExpression {}
@available(FoundationPredicate 0.1, *)
extension PredicateExpressions.ForcedUnwrap : StandardPredicateExpression where Inner : StandardPredicateExpression {}
@available(FoundationPredicate 0.1, *)
extension PredicateExpressions.OptionalFlatMap : Codable where LHS : Codable, RHS : Codable {
public func encode(to encoder: Encoder) throws {
var container = encoder.unkeyedContainer()
try container.encode(wrapped)
try container.encode(transform)
try container.encode(variable)
}
public init(from decoder: Decoder) throws {
var container = try decoder.unkeyedContainer()
wrapped = try container.decode(LHS.self)
transform = try container.decode(RHS.self)
variable = try container.decode(PredicateExpressions.Variable<Wrapped>.self)
}
}
@available(FoundationPredicate 0.1, *)
extension PredicateExpressions.NilCoalesce : Codable where LHS : Codable, RHS : Codable {
public func encode(to encoder: Encoder) throws {
var container = encoder.unkeyedContainer()
try container.encode(lhs)
try container.encode(rhs)
}
public init(from decoder: Decoder) throws {
var container = try decoder.unkeyedContainer()
lhs = try container.decode(LHS.self)
rhs = try container.decode(RHS.self)
}
}
@available(FoundationPredicate 0.1, *)
extension PredicateExpressions.ForcedUnwrap : Codable where Inner : Codable {
public func encode(to encoder: Encoder) throws {
var container = encoder.singleValueContainer()
try container.encode(inner)
}
public init(from decoder: Decoder) throws {
let container = try decoder.singleValueContainer()
inner = try container.decode(Inner.self)
}
}
@available(FoundationPredicate 0.1, *)
extension PredicateExpressions.OptionalFlatMap : Sendable where LHS : Sendable, RHS : Sendable {}
@available(FoundationPredicate 0.1, *)
extension PredicateExpressions.NilCoalesce : Sendable where LHS : Sendable, RHS : Sendable {}
@available(FoundationPredicate 0.1, *)
extension PredicateExpressions.ForcedUnwrap : Sendable where Inner : Sendable {}
@available(FoundationPredicate 0.1, *)
extension PredicateExpressions {
public struct NilLiteral<Wrapped> : StandardPredicateExpression, Codable, Sendable {
public typealias Output = Optional<Wrapped>
public init() {}
public func evaluate(_ bindings: PredicateBindings) throws -> Output {
nil
}
public func encode(to encoder: Encoder) throws {
var container = encoder.singleValueContainer()
try container.encodeNil()
}
public init(from decoder: Decoder) throws {}
}
public static func build_NilLiteral<Wrapped>() -> NilLiteral<Wrapped> {
NilLiteral()
}
}
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