1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
|
//===----------------------------------------------------------------------===//
//
// 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 Foundation
import SwiftSyntax
import SwiftSyntaxMacros
/// Creates a non-optional URL from a static string. The string is checked to
/// be valid during compile time.
public enum URLMacro: ExpressionMacro {
public static func expansion(
of node: some FreestandingMacroExpansionSyntax,
in context: some MacroExpansionContext
) throws -> ExprSyntax {
guard let argument = node.arguments.first?.expression,
let segments = argument.as(StringLiteralExprSyntax.self)?.segments,
segments.count == 1,
case .stringSegment(let literalSegment)? = segments.first
else {
throw CustomError.message("#URL requires a static string literal")
}
guard let _ = URL(string: literalSegment.content.text) else {
throw CustomError.message("malformed url: \(argument)")
}
return "URL(string: \(argument))!"
}
}
|
