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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
//
//===----------------------------------------------------------------------===//
#if compiler(>=6)
public import SwiftSyntax
#else
import SwiftSyntax
#endif
/// Describes a macro that can create the body for a function that does not
/// have one.
public protocol BodyMacro: AttachedMacro {
/// Expand a macro described by the given custom attribute and
/// attached to the given declaration and evaluated within a
/// particular expansion context.
///
/// The macro expansion can introduce a body for the given function.
static func expansion(
of node: AttributeSyntax,
providingBodyFor declaration: some DeclSyntaxProtocol & WithOptionalCodeBlockSyntax,
in context: some MacroExpansionContext
) throws -> [CodeBlockItemSyntax]
/// Expand a macro described by the given custom attribute and
/// attached to the given closure and evaluated within a
/// particular expansion context.
///
/// The macro expansion can replace the body of the given closure.
static func expansion(
of node: AttributeSyntax,
providingBodyFor closure: ClosureExprSyntax,
in context: some MacroExpansionContext
) throws -> [CodeBlockItemSyntax]
}
private struct ClosureNotSupported: Error, CustomStringConvertible {
var description: String {
"Function body macro cannot be applied to closure"
}
}
extension BodyMacro {
public static func expansion(
of node: AttributeSyntax,
providingBodyFor closure: ClosureExprSyntax,
in context: some MacroExpansionContext
) throws -> [CodeBlockItemSyntax] {
throw ClosureNotSupported()
}
}
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