MemberAttributeMacro.swift

//===----------------------------------------------------------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//

#if compiler(>=6)
public import SwiftSyntax
#else
import SwiftSyntax
#endif

/// Describes a macro that can add attributes to the members inside the
/// declaration it's attached to.
public protocol MemberAttributeMacro: AttachedMacro {
  /// Expand an attached declaration macro to produce an attribute list for
  /// a given member.
  ///
  /// - Parameters:
  ///   - node: The custom attribute describing the attached macro.
  ///   - declaration: The declaration the macro attribute is attached to.
  ///   - member: The member declaration to attach the resulting attributes to.
  ///   - context: The context in which to perform the macro expansion.
  ///
  /// - Returns: the set of attributes to apply to the given member.
  static func expansion(
    of node: AttributeSyntax,
    attachedTo declaration: some DeclGroupSyntax,
    providingAttributesFor member: some DeclSyntaxProtocol,
    in context: some MacroExpansionContext
  ) throws -> [AttributeSyntax]
}