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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 SwiftSyntaxBuilder
import SwiftSyntaxMacros
/// Implementation of the `stringify` macro, which takes an expression
/// of any type and produces a tuple containing the value of that expression
/// and the source code that produced the value. For example
///
/// #stringify(x + y)
///
/// will expand to
///
/// (x + y, "x + y")
public enum StringifyMacro: ExpressionMacro {
public static func expansion(
of node: some FreestandingMacroExpansionSyntax,
in context: some MacroExpansionContext
) -> ExprSyntax {
guard let argument = node.arguments.first?.expression else {
fatalError("compiler bug: the macro does not have any arguments")
}
return "(\(argument), \(literal: argument.description))"
}
}
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