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PathCchIsRoot Updated isRoot extension. #892

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merged 1 commit into from
Dec 10, 2024
Merged

PathCchIsRoot Updated isRoot extension. #892

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31 changes: 27 additions & 4 deletions Sources/SwiftFormat/Utilities/URL+isRoot.swift
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Original file line number Diff line number Diff line change
Expand Up @@ -12,21 +12,44 @@

import Foundation

#if os(Windows)
import WinSDK
#endif

extension URL {
/// Returns a `Bool` to indicate if the given `URL` leads to the root of a filesystem.
/// A non-filesystem type `URL` will always return false.
@_spi(Testing) public var isRoot: Bool {
guard isFileURL else { return false }

#if compiler(>=6.1)
#if os(Windows)
let filePath = self.withUnsafeFileSystemRepresentation { pointer in
guard let pointer else {
return ""
}
return String(cString: pointer)
}
return filePath.withCString(encodedAs: UTF16.self, PathCchIsRoot)
#else // os(Windows)
return self.path == "/"
#endif // os(Windows)
#else // compiler(>=6.1)

#if os(Windows)
// FIXME: We should call into Windows' native check to check if this path is a root once https://github.com/swiftlang/swift-foundation/issues/976 is fixed.
// This is needed as the fixes from #844 aren't in the Swift 6.0 toolchain.
// https://github.com/swiftlang/swift-format/issues/844
var pathComponents = self.pathComponents
if pathComponents.first == "/" {
// Canonicalize `/C:/` to `C:/`.
pathComponents = Array(pathComponents.dropFirst())
}
return pathComponents.count <= 1
#else
#else // os(Windows)
// On Linux, we may end up with an string for the path due to https://github.com/swiftlang/swift-foundation/issues/980
// TODO: Remove the check for "" once https://github.com/swiftlang/swift-foundation/issues/980 is fixed.
// This is needed as the fixes from #980 aren't in the Swift 6.0 toolchain.
return self.path == "/" || self.path == ""
#endif
#endif // os(Windows)
#endif // compiler(>=6.1)
}
}
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