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ReducerMacro.swift
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ReducerMacro.swift
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import SwiftDiagnostics
import SwiftOperators
import SwiftSyntax
import SwiftSyntaxBuilder
import SwiftSyntaxMacroExpansion
import SwiftSyntaxMacros
public enum ReducerMacro {
}
extension ReducerMacro: ExtensionMacro {
public static func expansion<D: DeclGroupSyntax, T: TypeSyntaxProtocol, C: MacroExpansionContext>(
of node: AttributeSyntax,
attachedTo declaration: D,
providingExtensionsOf type: T,
conformingTo protocols: [TypeSyntax],
in context: C
) throws -> [ExtensionDeclSyntax] {
if let inheritanceClause = declaration.inheritanceClause,
inheritanceClause.inheritedTypes.contains(
where: {
["Reducer"].withQualified.contains($0.type.trimmedDescription)
}
)
{
return []
}
let proto =
declaration.isEnum
? "ComposableArchitecture.CaseReducer, ComposableArchitecture.Reducer"
: "ComposableArchitecture.Reducer"
let ext: DeclSyntax =
"""
\(declaration.attributes.availability)extension \(type.trimmed): \(raw: proto) {}
"""
return [ext.cast(ExtensionDeclSyntax.self)]
}
}
extension ReducerMacro: MemberAttributeMacro {
public static func expansion<D: DeclGroupSyntax, M: DeclSyntaxProtocol, C: MacroExpansionContext>(
of node: AttributeSyntax,
attachedTo declaration: D,
providingAttributesFor member: M,
in context: C
) throws -> [AttributeSyntax] {
if let enumDecl = member.as(EnumDeclSyntax.self) {
var attributes: [String] = []
switch enumDecl.name.text {
case "State":
attributes = ["CasePathable", "dynamicMemberLookup"]
case "Action":
attributes = ["CasePathable"]
default:
break
}
if let inheritanceClause = enumDecl.inheritanceClause,
inheritanceClause.inheritedTypes.contains(
where: {
["CasePathable"].withCasePathsQualified.contains($0.type.trimmedDescription)
}
)
{
attributes.removeAll(where: { $0 == "CasePathable" })
}
for attribute in enumDecl.attributes {
guard
case let .attribute(attribute) = attribute,
let attributeName = attribute.attributeName.as(IdentifierTypeSyntax.self)?.name.text
else { continue }
attributes.removeAll(where: { $0 == attributeName })
}
return attributes.map {
AttributeSyntax(attributeName: IdentifierTypeSyntax(name: .identifier($0)))
}
} else if let property = member.as(VariableDeclSyntax.self),
property.bindingSpecifier.text == "var",
property.bindings.count == 1,
let binding = property.bindings.first,
let identifier = binding.pattern.as(IdentifierPatternSyntax.self)?.identifier,
identifier.text == "body",
case .getter = binding.accessorBlock?.accessors,
let genericArguments = binding.typeAnnotation?
.type.as(SomeOrAnyTypeSyntax.self)?
.constraint.as(IdentifierTypeSyntax.self)?
.genericArgumentClause?
.arguments
{
if let reduce = declaration.memberBlock.members.first(where: {
guard
let method = $0.decl.as(FunctionDeclSyntax.self),
method.name.text == "reduce",
method.signature.parameterClause.parameters.count == 2,
let state = method.signature.parameterClause.parameters.first,
state.firstName.text == "into",
state.type.as(AttributedTypeSyntax.self)?.specifier?.text == "inout",
method.signature.parameterClause.parameters.last?.firstName.text == "action",
method.signature.effectSpecifiers == nil,
method.signature.returnClause?.type.as(IdentifierTypeSyntax.self) != nil
else {
return false
}
return true
}) {
let reduce = reduce.decl.cast(FunctionDeclSyntax.self)
let visitor = ReduceVisitor(viewMode: .all)
visitor.walk(declaration)
context.diagnose(
Diagnostic(
node: reduce.name,
message: MacroExpansionErrorMessage(
"""
A 'reduce' method should not be defined in a reducer with a 'body'; it takes \
precedence and 'body' will never be invoked
"""
),
notes: [
Note(
node: Syntax(identifier),
message: MacroExpansionNoteMessage("'body' defined here")
)
]
)
)
}
for attribute in property.attributes {
guard
case let .attribute(attribute) = attribute,
let attributeName = attribute.attributeName.as(IdentifierTypeSyntax.self)?.name.text
else { continue }
guard
!attributeName.starts(with: "ReducerBuilder"),
!attributeName.starts(with: "ComposableArchitecture.ReducerBuilder")
else { return [] }
}
let genericArguments =
genericArguments.count == 1
? "\(genericArguments.description).State, \(genericArguments.description).Action"
: "\(genericArguments)"
return [
AttributeSyntax(
attributeName: IdentifierTypeSyntax(
name: .identifier("ComposableArchitecture.ReducerBuilder<\(genericArguments)>")
)
)
]
} else if let enumCaseDecl = member.as(EnumCaseDeclSyntax.self),
enumCaseDecl.elements.count == 1,
let element = enumCaseDecl.elements.first
{
if let parameterClause = element.parameterClause,
parameterClause.parameters.count == 1,
let parameter = parameterClause.parameters.first
{
if parameter.type.as(IdentifierTypeSyntax.self)?.isEphemeral == true {
return [
AttributeSyntax(
attributeName: IdentifierTypeSyntax(
name: .identifier("ReducerCaseEphemeral")
)
)
]
} else {
return []
}
} else {
return [
AttributeSyntax(
attributeName: IdentifierTypeSyntax(
name: .identifier("ReducerCaseIgnored")
)
)
]
}
} else {
return []
}
}
}
extension IdentifierTypeSyntax {
fileprivate var isEphemeral: Bool {
self.name.text == "AlertState" || self.name.text == "ConfirmationDialogState"
}
}
extension ReducerMacro: MemberMacro {
public static func expansion<D: DeclGroupSyntax, C: MacroExpansionContext>(
of node: AttributeSyntax,
providingMembersOf declaration: D,
in context: C
) throws -> [DeclSyntax] {
let access = declaration.modifiers.first { $0.name.tokenKind == .keyword(.public) }
let typeNames = declaration.memberBlock.members.compactMap {
$0.as(MemberBlockItemSyntax.self)?.decl.as(StructDeclSyntax.self)?.name.text
?? $0.as(MemberBlockItemSyntax.self)?.decl.as(TypeAliasDeclSyntax.self)?.name.text
?? $0.as(MemberBlockItemSyntax.self)?.decl.as(EnumDeclSyntax.self)?.name.text
}
let hasState = typeNames.contains("State")
let hasAction = typeNames.contains("Action")
let bindings = declaration.memberBlock.members.flatMap {
$0.as(MemberBlockItemSyntax.self)?.decl.as(VariableDeclSyntax.self)?.bindings ?? []
}
let hasReduceMethod = declaration.memberBlock.members.contains {
guard
let method = $0.decl.as(FunctionDeclSyntax.self),
method.name.text == "reduce",
method.signature.parameterClause.parameters.count == 2,
let state = method.signature.parameterClause.parameters.first,
state.firstName.text == "into",
state.type.as(AttributedTypeSyntax.self)?.specifier?.text == "inout",
method.signature.parameterClause.parameters.last?.firstName.text == "action",
method.signature.effectSpecifiers == nil,
method.signature.returnClause?.type.as(IdentifierTypeSyntax.self) != nil
else {
return false
}
return true
}
let hasExplicitReducerBody =
bindings.contains {
guard $0.initializer == nil
else { return true }
guard
let name = $0.typeAnnotation?.type.as(SomeOrAnyTypeSyntax.self)?.constraint
.as(IdentifierTypeSyntax.self)?.name.text
else {
return false
}
return ["Reducer", "ReducerOf"].withQualified.contains(name)
} || hasReduceMethod
let hasBody =
bindings.contains {
$0.as(PatternBindingSyntax.self)?.pattern
.as(IdentifierPatternSyntax.self)?.identifier.text == "body"
} || hasReduceMethod
var decls: [DeclSyntax] = []
if let enumDecl = declaration.as(EnumDeclSyntax.self) {
let enumCaseElements = [ReducerCase](members: enumDecl.memberBlock.members)
var stateCaseDecls: [String] = []
var actionCaseDecls: [String] = []
var reducerType: ReducerCase.Body = .scoped([])
var reducerScopes: [String] = []
var storeCases: [String] = []
var storeScopes: [String] = []
for enumCaseElement in enumCaseElements {
stateCaseDecls.append(enumCaseElement.stateCaseDecl)
if let actionCaseDecl = enumCaseElement.actionCaseDecl {
actionCaseDecls.append(actionCaseDecl)
}
if let reducerScope = enumCaseElement.reducerScope {
reducerScopes.append(reducerScope)
}
reducerType.append(enumCaseElement.reducerTypeScope)
storeCases.append(enumCaseElement.storeCase)
storeScopes.append(enumCaseElement.storeScope)
}
if !hasState {
var conformances: [String] = []
if case let .argumentList(arguments) = node.arguments,
let startIndex = arguments.firstIndex(where: { $0.label?.text == "state" })
{
let endIndex =
arguments.firstIndex(where: { $0.label?.text == "action" })
?? arguments.endIndex
conformances.append(
contentsOf: arguments[startIndex..<endIndex].compactMap {
$0.expression.as(MemberAccessExprSyntax.self)?.declName.baseName.text.capitalized
}
)
}
decls.append(
"""
@CasePathable
@dynamicMemberLookup
@ObservableState
\(access)enum State: ComposableArchitecture.CaseReducerState\
\(raw: conformances.isEmpty ? "" : ", \(conformances.joined(separator: ", "))") {
\(access)typealias StateReducer = \(enumDecl.name.trimmed)
\(raw: stateCaseDecls.map(\.description).joined(separator: "\n"))
}
"""
)
}
if !hasAction {
var conformances: [String] = []
if case let .argumentList(arguments) = node.arguments,
let startIndex = arguments.firstIndex(where: { $0.label?.text == "action" })
{
conformances.append(
contentsOf: arguments[startIndex..<arguments.endIndex].compactMap {
$0.expression.as(MemberAccessExprSyntax.self)?.declName.baseName.text.capitalized
}
)
}
decls.append(
"""
@CasePathable
\(access)enum Action\
\(raw: conformances.isEmpty ? "" : ": \(conformances.joined(separator: ", "))") {
\(raw: actionCaseDecls.map(\.description).joined(separator: "\n"))
}
"""
)
}
if !hasBody {
var staticVarBody = ""
switch reducerType {
case .erased:
staticVarBody = "Reduce<Self.State, Self.Action>"
case let .scoped(reducerTypeScopes):
if reducerTypeScopes.isEmpty {
staticVarBody = "ComposableArchitecture.EmptyReducer<Self.State, Self.Action>"
} else if reducerTypeScopes.count == 1 {
staticVarBody = reducerTypeScopes[0]
} else {
for _ in 1...(reducerTypeScopes.count - 1) {
staticVarBody.append(
"ComposableArchitecture.ReducerBuilder<Self.State, Self.Action>._Sequence<"
)
}
staticVarBody.append(reducerTypeScopes[0])
staticVarBody.append(", ")
for type in reducerTypeScopes.dropFirst() {
staticVarBody.append(type)
staticVarBody.append(">, ")
}
staticVarBody.removeLast(2)
}
}
var body = ""
if reducerScopes.isEmpty {
body.append(
"""
ComposableArchitecture.EmptyReducer<Self.State, Self.Action>()
"""
)
} else {
body.append(
"""
\(reducerScopes.joined(separator: "\n"))
"""
)
}
if case .erased = reducerType {
body = """
ComposableArchitecture.Reduce(
ComposableArchitecture.CombineReducers {
\(body)
}
)
"""
}
decls.append(
"""
@ComposableArchitecture.ReducerBuilder<Self.State, Self.Action>
\(access)static var body: \(raw: staticVarBody) {
\(raw: body)
}
"""
)
}
if !typeNames.contains("CaseScope") {
decls.append(
"""
\(access)enum CaseScope {
\(raw: storeCases.joined(separator: "\n"))
}
"""
)
}
if !declaration.memberBlock.members.contains(
where: { $0.as(FunctionDeclSyntax.self)?.name.text == "scope" }
) {
decls.append(
"""
\(access)static func scope(\
_ store: ComposableArchitecture.Store<Self.State, Self.Action>\
) -> CaseScope {
switch store.state {
\(raw: storeScopes.joined(separator: "\n"))
}
}
"""
)
}
return decls
} else {
if let arguments = node.arguments {
context.diagnose(
Diagnostic(
node: arguments,
message: MacroExpansionErrorMessage(
"Argument passed to call that takes no arguments when applied to a struct"
),
fixIt: .replace(
message: MacroExpansionFixItMessage("Remove '(\(arguments))'"),
oldNode: node,
newNode:
node
.with(\.leftParen, nil)
.with(\.arguments, nil)
.with(\.rightParen, nil)
)
)
)
}
if !hasState && !hasExplicitReducerBody {
decls.append(
"""
@ObservableState
\(access)struct State: Codable, Equatable, Hashable, Sendable {
\(access)init() {}
}
"""
)
}
if !hasAction && !hasExplicitReducerBody {
decls.append("\(access)enum Action: Equatable, Hashable, Sendable {}")
}
if !hasBody {
decls.append("\(access)let body = ComposableArchitecture.EmptyReducer<State, Action>()")
}
return decls
}
}
}
private enum ReducerCase {
case element(EnumCaseElementSyntax, attribute: Attribute? = nil)
indirect case ifConfig([IfConfig])
enum Attribute {
case ephemeral
case ignored
}
struct IfConfig {
let poundKeyword: TokenSyntax
let condition: ExprSyntax?
let cases: [ReducerCase]
}
enum Body {
case erased
case scoped([String])
mutating func append(_ other: Body) {
switch (self, other) {
case let (.scoped(lhs), .scoped(rhs)):
self = .scoped(lhs + rhs)
case (.erased, _):
break
case (_, .erased):
self = .erased
}
}
}
var stateCaseDecl: String {
switch self {
case let .element(element, attribute):
if attribute != .ignored,
let parameterClause = element.parameterClause,
parameterClause.parameters.count == 1,
let parameter = parameterClause.parameters.first,
parameter.type.is(IdentifierTypeSyntax.self) || parameter.type.is(MemberTypeSyntax.self)
{
let stateCase = attribute == .ephemeral ? element : element.suffixed("State").type
return "case \(stateCase.trimmedDescription)"
} else {
return "case \(element.trimmedDescription)"
}
case let .ifConfig(configs):
return
configs
.map {
"""
\($0.poundKeyword.text) \($0.condition?.trimmedDescription ?? "")
\($0.cases.map(\.stateCaseDecl).joined(separator: "\n"))
"""
}
.joined(separator: "\n") + "#endif\n"
}
}
var actionCaseDecl: String? {
switch self {
case let .element(element, attribute):
if attribute != .ignored,
let parameterClause = element.parameterClause,
parameterClause.parameters.count == 1,
let parameter = parameterClause.parameters.first,
parameter.type.is(IdentifierTypeSyntax.self) || parameter.type.is(MemberTypeSyntax.self)
{
return "case \(element.suffixed("Action").type.trimmedDescription)"
} else {
return nil
}
case let .ifConfig(configs):
return
configs
.map {
let actionCaseDecls = $0.cases.compactMap(\.actionCaseDecl)
return """
\($0.poundKeyword.text) \($0.condition?.trimmedDescription ?? "")
\(actionCaseDecls.joined(separator: "\n"))
"""
}
.joined(separator: "\n") + "#endif\n"
}
}
var reducerTypeScope: Body {
switch self {
case let .element(element, attribute):
if attribute == nil,
let parameterClause = element.parameterClause,
parameterClause.parameters.count == 1,
let parameter = parameterClause.parameters.first,
parameter.type.is(IdentifierTypeSyntax.self) || parameter.type.is(MemberTypeSyntax.self)
{
let type = parameter.type
return .scoped(["ComposableArchitecture.Scope<Self.State, Self.Action, \(type.trimmed)>"])
} else {
return .scoped([])
}
case .ifConfig:
return .erased
}
}
var reducerScope: String? {
switch self {
case let .element(element, attribute):
if attribute == nil,
let parameterClause = element.parameterClause,
parameterClause.parameters.count == 1,
let parameter = parameterClause.parameters.first,
parameter.type.is(IdentifierTypeSyntax.self) || parameter.type.is(MemberTypeSyntax.self)
{
let name = element.name.text
let type = parameter.type
let reducer = parameter.defaultValue?.value.trimmedDescription ?? "\(type.trimmed)()"
return """
ComposableArchitecture.Scope(\
state: \\Self.State.Cases.\(name), action: \\Self.Action.Cases.\(name)\
) {
\(reducer)
}
"""
} else {
return nil
}
case let .ifConfig(configs):
return
configs
.map {
let reduceScopes = $0.cases.compactMap(\.reducerScope)
return """
\($0.poundKeyword.text) \($0.condition?.trimmedDescription ?? "")
\(reduceScopes.joined(separator: "\n"))
"""
}
.joined() + "#endif\n"
}
}
var storeCase: String {
switch self {
case let .element(element, attribute):
if attribute == nil,
let parameterClause = element.parameterClause,
parameterClause.parameters.count == 1,
let parameter = parameterClause.parameters.first,
parameter.type.is(IdentifierTypeSyntax.self) || parameter.type.is(MemberTypeSyntax.self)
{
let name = element.name.text
let type = parameter.type
return "case \(name)(ComposableArchitecture.StoreOf<\(type.trimmed)>)"
} else {
return "case \(element.trimmedDescription)"
}
case let .ifConfig(configs):
return
configs
.map {
"""
\($0.poundKeyword.text) \($0.condition?.trimmedDescription ?? "")
\($0.cases.map(\.storeCase).joined(separator: "\n"))
"""
}
.joined(separator: "\n") + "#endif\n"
}
}
var storeScope: String {
switch self {
case let .element(element, attribute):
let name = element.name.text
if attribute == nil,
let parameterClause = element.parameterClause,
parameterClause.parameters.count == 1,
let parameter = parameterClause.parameters.first,
parameter.type.is(IdentifierTypeSyntax.self) || parameter.type.is(MemberTypeSyntax.self)
{
return """
case .\(name):
return .\(name)(store.scope(state: \\.\(name), action: \\.\(name))!)
"""
} else if let parameters = element.parameterClause?.parameters {
let bindingNames = (0..<parameters.count).map { "v\($0)" }.joined(separator: ", ")
let returnNames = parameters.enumerated()
.map { "\($1.firstName.map { "\($0.text): " } ?? "")v\($0)" }
.joined(separator: ", ")
return """
case let .\(name)(\(bindingNames)):
return .\(name)(\(returnNames))
"""
} else {
return """
case .\(name):
return .\(name)
"""
}
case let .ifConfig(configs):
return
configs
.map {
"""
\($0.poundKeyword.text) \($0.condition?.trimmedDescription ?? "")
\($0.cases.map(\.storeScope).joined(separator: "\n"))
"""
}
.joined(separator: "\n") + "#endif\n"
}
}
}
extension Array where Element == ReducerCase {
init(members: MemberBlockItemListSyntax) {
self = members.flatMap {
if let enumCaseDecl = $0.decl.as(EnumCaseDeclSyntax.self) {
return enumCaseDecl.elements.map {
ReducerCase.element($0, attribute: enumCaseDecl.attribute)
}
}
if let ifConfigDecl = $0.decl.as(IfConfigDeclSyntax.self) {
let configs = ifConfigDecl.clauses.flatMap { decl -> [ReducerCase.IfConfig] in
guard let elements = decl.elements?.as(MemberBlockItemListSyntax.self)
else { return [] }
return [
ReducerCase.IfConfig(
poundKeyword: decl.poundKeyword,
condition: decl.condition,
cases: Array(members: elements)
)
]
}
return [.ifConfig(configs)]
}
return []
}
}
}
extension Array where Element == String {
var withCasePathsQualified: Self {
self.flatMap { [$0, "CasePaths.\($0)"] }
}
var withQualified: Self {
self.flatMap { [$0, "ComposableArchitecture.\($0)"] }
}
}
struct MacroExpansionNoteMessage: NoteMessage {
var message: String
init(_ message: String) {
self.message = message
}
var fixItID: MessageID {
MessageID(domain: diagnosticDomain, id: "\(Self.self)")
}
}
private let diagnosticDomain: String = "ComposableArchitectureMacros"
private final class ReduceVisitor: SyntaxVisitor {
var changes: [FixIt.Change] = []
override func visit(_ node: DeclReferenceExprSyntax) -> SyntaxVisitorContinueKind {
guard node.baseName.text == "reduce" else { return super.visit(node) }
guard
node.argumentNames == nil
|| node.argumentNames?.arguments.map(\.name.text) == ["into", "action"]
else { return super.visit(node) }
if let base = node.parent?.as(MemberAccessExprSyntax.self)?.base,
base.as(DeclReferenceExprSyntax.self)?.baseName.tokenKind != .keyword(Keyword.`self`)
{
return super.visit(node)
}
self.changes.append(
.replace(
oldNode: Syntax(node),
newNode: Syntax(node.with(\.baseName, "update"))
)
)
return .visitChildren
}
}
extension EnumCaseDeclSyntax {
fileprivate var attribute: ReducerCase.Attribute? {
if self.isIgnored {
return .ignored
} else if self.isEphemeral {
return .ephemeral
} else {
return nil
}
}
fileprivate var isIgnored: Bool {
self.attributes.contains("ReducerCaseIgnored")
|| self.elements.contains { $0.parameterClause?.parameters.count != 1 }
}
fileprivate var isEphemeral: Bool {
self.attributes.contains("ReducerCaseEphemeral")
|| self.elements.contains {
guard
let parameterClause = $0.parameterClause,
parameterClause.parameters.count == 1,
let parameter = parameterClause.parameters.first,
parameter.type.as(IdentifierTypeSyntax.self)?.isEphemeral == true
else { return false }
return true
}
}
}
extension EnumCaseElementSyntax {
fileprivate var type: Self {
var element = self
if var parameterClause = element.parameterClause {
parameterClause.parameters[parameterClause.parameters.startIndex].defaultValue = nil
element.parameterClause = parameterClause
}
return element
}
fileprivate func suffixed(_ suffix: TokenSyntax) -> Self {
var element = self
if var parameterClause = element.parameterClause,
let type = parameterClause.parameters.first?.type
{
let type = MemberTypeSyntax(baseType: type.trimmed, name: suffix)
parameterClause.parameters[parameterClause.parameters.startIndex].type = TypeSyntax(type)
element.parameterClause = parameterClause
}
return element
}
}
extension AttributeListSyntax {
fileprivate func contains(_ name: TokenSyntax) -> Bool {
self.contains {
guard
case let .attribute(attribute) = $0,
attribute.attributeName.as(IdentifierTypeSyntax.self)?.name.text == name.text
else { return false }
return true
}
}
}
enum ReducerCaseEphemeralMacro: PeerMacro {
static func expansion(
of node: AttributeSyntax,
providingPeersOf declaration: some DeclSyntaxProtocol,
in context: some MacroExpansionContext
) throws -> [DeclSyntax] {
[]
}
}
enum ReducerCaseIgnoredMacro: PeerMacro {
static func expansion(
of node: AttributeSyntax,
providingPeersOf declaration: some DeclSyntaxProtocol,
in context: some MacroExpansionContext
) throws -> [DeclSyntax] {
[]
}
}