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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
/// Implementation of the `#fontLiteral` macro, which is similar in spirit
/// to the built-in expressions `#colorLiteral`, `#imageLiteral`, etc., but in
/// a small macro.
public enum FontLiteralMacro: ExpressionMacro {
public static func expansion(
of node: some FreestandingMacroExpansionSyntax,
in context: some MacroExpansionContext
) throws -> ExprSyntax {
let argList = replaceFirstLabel(
of: node.arguments,
with: "fontLiteralName"
)
return ".init(\(argList))"
}
}
/// Replace the label of the first element in the tuple with the given
/// new label.
private func replaceFirstLabel(
of tuple: LabeledExprListSyntax,
with newLabel: String
) -> LabeledExprListSyntax {
if tuple.isEmpty {
return tuple
}
var tuple = tuple
tuple[tuple.startIndex].label = .identifier(newLabel)
tuple[tuple.startIndex].colon = .colonToken()
return tuple
}
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