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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 SwiftDiagnostics
import SwiftSyntax
import SwiftSyntaxMacros
/// Implementation of the `myWarning` macro, which mimics the behavior of the
/// built-in `#warning`.
public enum WarningMacro: ExpressionMacro {
public static func expansion(
of node: some FreestandingMacroExpansionSyntax,
in context: some MacroExpansionContext
) throws -> ExprSyntax {
guard let firstElement = node.arguments.first,
let stringLiteral = firstElement.expression
.as(StringLiteralExprSyntax.self),
stringLiteral.segments.count == 1,
case let .stringSegment(messageString)? = stringLiteral.segments.first
else {
throw CustomError.message("#myWarning macro requires a string literal")
}
context.diagnose(
Diagnostic(
node: Syntax(node),
message: SimpleDiagnosticMessage(
message: messageString.content.description,
diagnosticID: MessageID(domain: "test123", id: "error"),
severity: .warning
)
)
)
return "()"
}
}
|
