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MultiRoleMacroTests.swift
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MultiRoleMacroTests.swift
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//===----------------------------------------------------------------------===//
//
// This source file is part of the Swift.org 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 https://swift.org/LICENSE.txt for license information
// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
//
//===----------------------------------------------------------------------===//
//==========================================================================//
// IMPORTANT: The macros defined in this file are intended to test the //
// behavior of MacroSystem. Many of them do not serve as good examples of //
// how macros should be written. In particular, they often lack error //
// handling because it is not needed in the few test cases in which these //
// macros are invoked. //
//==========================================================================//
import SwiftSyntax
import SwiftSyntaxMacroExpansion
import SwiftSyntaxMacros
import SwiftSyntaxMacrosTestSupport
import XCTest
final class MultiRoleMacroTests: XCTestCase {
private let indentationWidth: Trivia = .spaces(2)
func testContextUniqueLocalNames() {
let context = BasicMacroExpansionContext(lexicalContext: [])
let t1 = context.makeUniqueName("mine")
let t2 = context.makeUniqueName("mine")
XCTAssertNotEqual(t1.description, t2.description)
XCTAssertEqual(t1.description, "__macro_local_4minefMu_")
XCTAssertEqual(t2.description, "__macro_local_4minefMu0_")
}
func testPropertyWrapper() {
struct PropertyWrapper: AccessorMacro, PeerMacro {
static func expansion(
of node: AttributeSyntax,
providingAccessorsOf declaration: some DeclSyntaxProtocol,
in context: some MacroExpansionContext
) throws -> [AccessorDeclSyntax] {
guard let binding = declaration.as(VariableDeclSyntax.self)?.bindings.first,
let identifier = binding.pattern.as(IdentifierPatternSyntax.self)?.identifier,
binding.accessorBlock == nil
else {
return []
}
return [
"""
get {
_\(identifier).wrappedValue
}
""",
"""
set {
_\(identifier).wrappedValue = newValue
}
""",
]
}
static func expansion(
of node: AttributeSyntax,
providingPeersOf declaration: some DeclSyntaxProtocol,
in context: some MacroExpansionContext
) throws -> [SwiftSyntax.DeclSyntax] {
guard let binding = declaration.as(VariableDeclSyntax.self)?.bindings.first,
let identifier = binding.pattern.as(IdentifierPatternSyntax.self)?.identifier,
let type = binding.typeAnnotation?.type,
binding.accessorBlock == nil
else {
return []
}
guard case .argumentList(let arguments) = node.arguments,
let stringLiteral = arguments.first?.expression.as(StringLiteralExprSyntax.self),
stringLiteral.segments.count == 1,
case let .stringSegment(wrapperTypeNameSegment)? = stringLiteral.segments.first
else {
return []
}
let storageType: TypeSyntax = "\(wrapperTypeNameSegment.content)<\(type)>"
let storageName = "_\(identifier)"
return [
"""
private var \(raw: storageName): \(storageType)
"""
]
}
}
assertMacroExpansion(
"""
@wrapProperty("MyWrapperType")
var x: Int
""",
expandedSource: """
var x: Int {
get {
_x.wrappedValue
}
set {
_x.wrappedValue = newValue
}
}
private var _x: MyWrapperType<Int>
""",
macros: ["wrapProperty": PropertyWrapper.self],
indentationWidth: indentationWidth
)
}
func testTypeWrapperTransform() {
struct CustomTypeWrapperMacro: MemberMacro, MemberAttributeMacro, AccessorMacro {
static func expansion(
of node: AttributeSyntax,
providingMembersOf declaration: some DeclGroupSyntax,
in context: some MacroExpansionContext
) throws -> [DeclSyntax] {
return ["var _storage: Wrapper<Self>"]
}
static func expansion(
of node: AttributeSyntax,
attachedTo declaration: some DeclGroupSyntax,
providingAttributesFor member: some DeclSyntaxProtocol,
in context: some MacroExpansionContext
) throws -> [AttributeSyntax] {
return ["@customTypeWrapper"]
}
static func expansion(
of node: AttributeSyntax,
providingAccessorsOf declaration: some DeclSyntaxProtocol,
in context: some MacroExpansionContext
) throws -> [AccessorDeclSyntax] {
guard let property = declaration.as(VariableDeclSyntax.self),
let binding = property.bindings.first,
let identifier = binding.pattern.as(IdentifierPatternSyntax.self)?.identifier,
binding.accessorBlock == nil
else {
return []
}
if identifier.text == "_storage" { return [] }
return [
"""
get {
_storage[wrappedKeyPath: \\.\(identifier)]
}
""",
"""
set {
_storage[wrappedKeyPath: \\.\(identifier)] = newValue
}
""",
]
}
}
assertMacroExpansion(
"""
@customTypeWrapper
struct Point {
var x: Int
var y: Int
}
""",
expandedSource: """
struct Point {
var x: Int {
get {
_storage[wrappedKeyPath: \\.x]
}
set {
_storage[wrappedKeyPath: \\.x] = newValue
}
}
var y: Int {
get {
_storage[wrappedKeyPath: \\.y]
}
set {
_storage[wrappedKeyPath: \\.y] = newValue
}
}
var _storage: Wrapper<Self>
}
""",
macros: ["customTypeWrapper": CustomTypeWrapperMacro.self],
indentationWidth: indentationWidth
)
}
func testAttachedMacroOnFreestandingMacro() {
struct DeclMacro: DeclarationMacro {
static func expansion(
of node: some FreestandingMacroExpansionSyntax,
in context: some MacroExpansionContext
) throws -> [DeclSyntax] {
return ["var x: Int"]
}
}
struct MyPeerMacro: PeerMacro {
static func expansion(
of node: AttributeSyntax,
providingPeersOf declaration: some DeclSyntaxProtocol,
in context: some MacroExpansionContext
) throws -> [DeclSyntax] {
return ["var peer: Int"]
}
}
assertMacroExpansion(
"""
struct Foo {
@Peer
#decl
}
""",
expandedSource: """
struct Foo {
var x: Int
var peer: Int
}
""",
macros: ["decl": DeclMacro.self, "Peer": MyPeerMacro.self]
)
assertMacroExpansion(
"""
@Peer
#decl
""",
expandedSource: """
var x: Int
var peer: Int
""",
macros: ["decl": DeclMacro.self, "Peer": MyPeerMacro.self]
)
}
}