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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,47 @@ | ||
| import SwiftSyntax | ||
| import SwiftSyntaxBuilder | ||
| import SwiftSyntaxMacros | ||
| import Foundation | ||
|
|
||
| public struct ConformToHashable: ExtensionMacro { | ||
| public static func expansion(of node: SwiftSyntax.AttributeSyntax, | ||
| attachedTo declaration: some SwiftSyntax.DeclGroupSyntax, | ||
| providingExtensionsOf type: some SwiftSyntax.TypeSyntaxProtocol, | ||
| conformingTo protocols: [SwiftSyntax.TypeSyntax], | ||
| in context: some SwiftSyntaxMacros.MacroExpansionContext) throws -> [SwiftSyntax.ExtensionDeclSyntax] { | ||
| guard [SwiftSyntax.SyntaxKind.classDecl].contains(declaration.kind) else { | ||
| throw MacroDiagnostics.errorMacroUsage(message: "Can only be applied to a class type") | ||
| } | ||
| let equatableProtocol = InheritanceClauseSyntax(inheritedTypes: InheritedTypeListSyntax( | ||
| arrayLiteral: InheritedTypeSyntax(type: TypeSyntax(stringLiteral: "Hashable"))) | ||
| ) | ||
|
|
||
| let mambers = declaration.memberBlock.members.compactMap { member in | ||
| if let patternBinding = member.decl.as(VariableDeclSyntax.self)?.bindings | ||
| .as(PatternBindingListSyntax.self)?.first?.as(PatternBindingSyntax.self), | ||
| let identifier = patternBinding.pattern.as(IdentifierPatternSyntax.self)?.identifier, | ||
| let type = patternBinding.typeAnnotation?.as(TypeAnnotationSyntax.self)?.type { | ||
| if type.is(IdentifierTypeSyntax.self) { | ||
| return "hasher.combine(\(identifier))" | ||
| } | ||
| if let wrappedType = type.as(OptionalTypeSyntax.self)?.wrappedType, | ||
| wrappedType.is(IdentifierTypeSyntax.self) { | ||
| return "hasher.combine(\(identifier))" | ||
| } | ||
| } | ||
| return nil | ||
| }.joined(separator: "\n ") | ||
|
|
||
| let equtableFunction = """ | ||
| func hash(into hasher: inout Hasher) { | ||
| \(mambers) | ||
| } | ||
| """ | ||
|
|
||
| let member = MemberBlockSyntax(members: MemberBlockItemListSyntax(stringLiteral: equtableFunction)) | ||
| let extensionDecl = ExtensionDeclSyntax(extendedType: type, | ||
| inheritanceClause: equatableProtocol, | ||
| memberBlock: member) | ||
| return [extensionDecl] | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,108 @@ | ||
| import SwiftSyntaxMacros | ||
| import SwiftSyntaxMacrosTestSupport | ||
| import XCTest | ||
| import Macros | ||
|
|
||
| final class ConformToHashableTests: XCTestCase { | ||
| let testMacros: [String: Macro.Type] = [ | ||
| "ConformToHashable": ConformToHashable.self, | ||
| ] | ||
|
|
||
| func testConformToEquatableMacro() { | ||
| assertMacroExpansion( | ||
| """ | ||
| @ConformToHashable | ||
| class AClass { | ||
| let a: Int | ||
| let b: Int | ||
| init(a: Int, b: Int) { | ||
| self.a = a | ||
| self.b = b | ||
| } | ||
| } | ||
| """, | ||
| expandedSource: | ||
| """ | ||
| class AClass { | ||
| let a: Int | ||
| let b: Int | ||
| init(a: Int, b: Int) { | ||
| self.a = a | ||
| self.b = b | ||
| } | ||
| } | ||
| extension AClass: Hashable { | ||
| func hash(into hasher: inout Hasher) { | ||
| hasher.combine(a) | ||
| } | ||
| } | ||
| """, | ||
| macros: testMacros | ||
| ) | ||
| } | ||
|
|
||
| func testConformToEquatableIgnoreClosureTypeMacro() { | ||
| assertMacroExpansion( | ||
| """ | ||
| @ConformToHashable | ||
| class AClass { | ||
| let a: Int | ||
| let b: (Int) -> Void | ||
| init(a: Int, b: (Int) -> Void) { | ||
| self.a = a | ||
| self.b = b | ||
| } | ||
| } | ||
| """, | ||
| expandedSource: | ||
| """ | ||
| class AClass { | ||
| let a: Int | ||
| let b: (Int) -> Void | ||
| init(a: Int, b: (Int) -> Void) { | ||
| self.a = a | ||
| self.b = b | ||
| } | ||
| } | ||
| extension AClass: Hashable { | ||
| func hash(into hasher: inout Hasher) { | ||
| hasher.combine(a) | ||
| } | ||
| } | ||
| """, | ||
| macros: testMacros | ||
| ) | ||
| } | ||
|
|
||
| func testConformToEquatableIncludeOptionalTypeMacro() { | ||
| assertMacroExpansion( | ||
| """ | ||
| @ConformToHashable | ||
| class AClass { | ||
| let a: Int? | ||
| init(a: Int?) { | ||
| self.a = a | ||
| } | ||
| } | ||
| """, | ||
| expandedSource: | ||
| """ | ||
| class AClass { | ||
| let a: Int? | ||
| init(a: Int?) { | ||
| self.a = a | ||
| } | ||
| } | ||
| extension AClass: Hashable { | ||
| func hash(into hasher: inout Hasher) { | ||
| hasher.combine(a) | ||
| } | ||
| } | ||
| """, | ||
| macros: testMacros | ||
| ) | ||
| } | ||
| } |