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Merge pull request #172 from PureSwift/feature/macros
Add macros
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,77 @@ | ||
| // | ||
| // Address.swift | ||
| // Bluetooth | ||
| // | ||
| // Created by Alsey Coleman Miller on 1/9/25. | ||
| // | ||
|
|
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| import Foundation | ||
| import SwiftSyntaxMacros | ||
| import SwiftSyntax | ||
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| struct BluetoothAddressMacro: ExpressionMacro { | ||
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| static func expansion( | ||
| of node: some FreestandingMacroExpansionSyntax, | ||
| in context: some MacroExpansionContext | ||
| ) throws(Error) -> ExprSyntax { | ||
|
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| 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 .requiresStaticStringLiteral | ||
| } | ||
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| guard let _ = Self.parse(literalSegment.content.text) else { | ||
| throw .invalidString("\(argument)") | ||
| } | ||
|
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| return "BluetoothAddress(rawValue: \(argument))!" | ||
| } | ||
|
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| /// Initialize a Bluetooth Address from its big endian string representation (e.g. `00:1A:7D:DA:71:13`). | ||
| static func parse<S: StringProtocol>(_ rawValue: S) -> ByteValue? { | ||
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| // verify string length | ||
| let characters = rawValue.utf8 | ||
| guard characters.count == 17, | ||
| let separator = ":".utf8.first | ||
| else { return nil } | ||
|
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| var bytes: ByteValue = (0, 0, 0, 0, 0, 0) | ||
|
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| let components = characters.split(whereSeparator: { $0 == separator }) | ||
|
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| guard components.count == 6 | ||
| else { return nil } | ||
|
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| for (index, subsequence) in components.enumerated() { | ||
|
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| guard subsequence.count == 2, | ||
| let byte = UInt8(hexadecimal: subsequence) | ||
| else { return nil } | ||
|
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| withUnsafeMutablePointer(to: &bytes) { | ||
| $0.withMemoryRebound(to: UInt8.self, capacity: 6) { | ||
| $0.advanced(by: index).pointee = byte | ||
| } | ||
| } | ||
| } | ||
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| return bytes | ||
| } | ||
| } | ||
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| // MARK: - Supporting Types | ||
|
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| extension BluetoothAddressMacro { | ||
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| /// Raw Bluetooth Address 6 byte (48 bit) value. | ||
| typealias ByteValue = (UInt8, UInt8, UInt8, UInt8, UInt8, UInt8) | ||
|
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| enum Error: Swift.Error { | ||
| case requiresStaticStringLiteral | ||
| case invalidString(String) | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,61 @@ | ||
| // | ||
| // BluetoothUUID.swift | ||
| // Bluetooth | ||
| // | ||
| // Created by Alsey Coleman Miller on 1/9/25. | ||
| // | ||
|
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| import Foundation | ||
| import SwiftSyntaxMacros | ||
| import SwiftSyntax | ||
|
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| struct BluetoothUUIDMacro: ExpressionMacro { | ||
|
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| static func expansion( | ||
| of node: some FreestandingMacroExpansionSyntax, | ||
| in context: some MacroExpansionContext | ||
| ) throws(Error) -> ExprSyntax { | ||
|
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| 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 .requiresStaticStringLiteral | ||
| } | ||
|
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| guard validate(literalSegment.content.text) else { | ||
| throw .invalidString("\(argument)") | ||
| } | ||
|
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| return "BluetoothUUID(rawValue: \(argument))!" | ||
| } | ||
|
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| static func validate(_ rawValue: String) -> Bool { | ||
| switch rawValue.utf8.count { | ||
| case 4: | ||
| guard let _ = UInt16(hexadecimal: rawValue) | ||
| else { return false } | ||
| return true | ||
| case 8: | ||
| guard let _ = UInt32(hexadecimal: rawValue) | ||
| else { return false } | ||
| return true | ||
| case 36: | ||
| guard let _ = UUID(uuidString: rawValue) | ||
| else { return false } | ||
| return true | ||
| default: | ||
| return false | ||
| } | ||
| } | ||
| } | ||
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| // MARK: - Supporting Types | ||
|
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| extension BluetoothUUIDMacro { | ||
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| enum Error: Swift.Error { | ||
| case requiresStaticStringLiteral | ||
| case invalidString(String) | ||
| } | ||
| } |
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