63 lines
2.1 KiB
Swift
63 lines
2.1 KiB
Swift
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import SwiftCompilerPlugin
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import SwiftSyntax
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import SwiftSyntaxMacros
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@main
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struct SupermanPlugin: CompilerPlugin {
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let providingMacros: [Macro.Type] = [
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SuperFirstMacro.self,
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SuperLastMacro.self,
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]
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}
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public struct SuperFirstMacro: BodyMacro {
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public static func expansion(of node: AttributeSyntax,
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providingBodyFor declaration: some DeclSyntaxProtocol & WithOptionalCodeBlockSyntax,
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in context: some MacroExpansionContext) throws -> [CodeBlockItemSyntax] {
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// Only allow Functions
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guard let funcDecl = declaration.as(FunctionDeclSyntax.self) else {
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throw Error.message("@SuperFirst only works on functions")
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}
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// Only allow Void Functions
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guard funcDecl.signature.returnClause?.type.as(IdentifierTypeSyntax.self)?.name.text != "Void" else {
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throw Error.message("@SuperFirst only works on Void functions")
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}
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// Requires Function Body
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guard let funcBody = funcDecl.body else {
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throw Error.message("@SuperFirst only works on functions with bodies")
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}
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let arguments = funcDecl.signature.parameterClause.parameters
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let callArgs = arguments.map { argument in
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"\(argument.firstName): \(argument.secondName ?? argument.firstName)"
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}.joined(separator: ", ")
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return ["super.\(funcDecl.name)(\(raw: callArgs))"] + Array(funcBody.statements)
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}
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}
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public struct SuperLastMacro: BodyMacro {
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public static func expansion(of node: AttributeSyntax,
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providingBodyFor declaration: some DeclSyntaxProtocol & WithOptionalCodeBlockSyntax,
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in context: some MacroExpansionContext) throws -> [CodeBlockItemSyntax] {
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// Only allow Functions
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guard let funcDecl = declaration.as(FunctionDeclSyntax.self) else {
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throw Error.message("@SuperLast only works on functions")
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}
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// Requires Function Body
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guard let funcBody = funcDecl.body else {
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throw Error.message("@SuperLast only works on functions with bodies")
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}
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let arguments = funcDecl.signature.parameterClause.parameters
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let callArgs = arguments.map { argument in
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"\(argument.firstName): \(argument.secondName ?? argument.firstName)"
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}.joined(separator: ", ")
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return Array(funcBody.statements) + ["return super.\(funcDecl.name)(\(raw: callArgs))"]
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}
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}
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