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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
//
//===----------------------------------------------------------------------===//
import SwiftSyntax
import SwiftSyntaxMacros
public enum CustomCodable: MemberMacro {
public static func expansion(
of node: AttributeSyntax,
providingMembersOf declaration: some DeclGroupSyntax,
conformingTo: [TypeSyntax],
in context: some MacroExpansionContext
) throws -> [DeclSyntax] {
let memberList = declaration.memberBlock.members
let cases = memberList.compactMap({ member -> String? in
// is a property
guard
let propertyName = member
.decl.as(VariableDeclSyntax.self)?
.bindings.first?
.pattern.as(IdentifierPatternSyntax.self)?.identifier.text
else {
return nil
}
// if it has a CodableKey macro on it
if let customKeyMacro = member.decl.as(VariableDeclSyntax.self)?.attributes.first(where: { element in
element.as(AttributeSyntax.self)?.attributeName.as(IdentifierTypeSyntax.self)?.description == "CodableKey"
}) {
// Uses the value in the Macro
let customKeyValue = customKeyMacro.as(AttributeSyntax.self)!
.arguments!.as(LabeledExprListSyntax.self)!
.first!
.expression
return "case \(propertyName) = \(customKeyValue)"
} else {
return "case \(propertyName)"
}
})
let codingKeys: DeclSyntax = """
enum CodingKeys: String, CodingKey {
\(raw: cases.joined(separator: "\n"))
}
"""
return [codingKeys]
}
}
public struct CodableKey: PeerMacro {
public static func expansion(
of node: AttributeSyntax,
providingPeersOf declaration: some DeclSyntaxProtocol,
in context: some MacroExpansionContext
) throws -> [DeclSyntax] {
// Does nothing, used only to decorate members with data
return []
}
}
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