├── .gitignore ├── .swiftpm └── xcode │ └── package.xcworkspace │ ├── contents.xcworkspacedata │ └── xcshareddata │ └── IDEWorkspaceChecks.plist ├── LICENSE ├── Package.resolved ├── Package.swift ├── README.md ├── Sources ├── HexColorMacro │ └── HexColorMacro.swift ├── HexColorMacroClient │ └── main.swift └── HexColorMacroMacros │ └── HexColorMacroMacro.swift └── Tests └── HexColorMacroTests └── HexColorMacroTests.swift /.gitignore: -------------------------------------------------------------------------------- 1 | # Created by https://www.toptal.com/developers/gitignore/api/swift 2 | # Edit at https://www.toptal.com/developers/gitignore?templates=swift 3 | 4 | ### Swift ### 5 | # Xcode 6 | # 7 | # gitignore contributors: remember to update Global/Xcode.gitignore, Objective-C.gitignore & Swift.gitignore 8 | 9 | ## User settings 10 | xcuserdata/ 11 | 12 | ## compatibility with Xcode 8 and earlier (ignoring not required starting Xcode 9) 13 | *.xcscmblueprint 14 | *.xccheckout 15 | 16 | ## compatibility with Xcode 3 and earlier (ignoring not required starting Xcode 4) 17 | build/ 18 | DerivedData/ 19 | *.moved-aside 20 | *.pbxuser 21 | !default.pbxuser 22 | *.mode1v3 23 | !default.mode1v3 24 | *.mode2v3 25 | !default.mode2v3 26 | *.perspectivev3 27 | !default.perspectivev3 28 | 29 | ## Obj-C/Swift specific 30 | *.hmap 31 | 32 | ## App packaging 33 | *.ipa 34 | *.dSYM.zip 35 | *.dSYM 36 | 37 | ## Playgrounds 38 | timeline.xctimeline 39 | playground.xcworkspace 40 | 41 | # Swift Package Manager 42 | # Add this line if you want to avoid checking in source code from Swift Package Manager dependencies. 43 | # Packages/ 44 | # Package.pins 45 | # Package.resolved 46 | # *.xcodeproj 47 | # Xcode automatically generates this directory with a .xcworkspacedata file and xcuserdata 48 | # hence it is not needed unless you have added a package configuration file to your project 49 | # .swiftpm 50 | 51 | .build/ 52 | 53 | # CocoaPods 54 | # We recommend against adding the Pods directory to your .gitignore. 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-------------------------------------------------------------------------------- 1 | { 2 | "originHash" : "ac637b69e98e3da28096d44a26cdfa504ea0f27b61129d6671c3156ed9a6374d", 3 | "pins" : [ 4 | { 5 | "identity" : "swift-syntax", 6 | "kind" : "remoteSourceControl", 7 | "location" : "https://github.com/apple/swift-syntax.git", 8 | "state" : { 9 | "revision" : "0687f71944021d616d34d922343dcef086855920", 10 | "version" : "600.0.1" 11 | } 12 | } 13 | ], 14 | "version" : 3 15 | } 16 | -------------------------------------------------------------------------------- /Package.swift: -------------------------------------------------------------------------------- 1 | // swift-tools-version: 6.0 2 | // The swift-tools-version declares the minimum version of Swift required to build this package. 3 | 4 | import CompilerPluginSupport 5 | import PackageDescription 6 | 7 | let package = Package( 8 | name: "HexColorMacro", 9 | platforms: [.macOS(.v10_15), .iOS(.v13), .tvOS(.v13), .watchOS(.v6), .macCatalyst(.v13)], 10 | products: [ 11 | // Products define the executables and libraries a package produces, making them visible to other packages. 12 | .library( 13 | name: "HexColorMacro", 14 | targets: ["HexColorMacro"] 15 | ), 16 | .executable( 17 | name: "HexColorMacroClient", 18 | targets: ["HexColorMacroClient"] 19 | ), 20 | ], 21 | dependencies: [ 22 | // Depend on the Swift 5.9 release of SwiftSyntax 23 | .package(url: "https://github.com/apple/swift-syntax.git", from: "600.0.0") 24 | ], 25 | targets: [ 26 | // Targets are the basic building blocks of a package, defining a module or a test suite. 27 | // Targets can depend on other targets in this package and products from dependencies. 28 | // Macro implementation that performs the source transformation of a macro. 29 | .macro( 30 | name: "HexColorMacroMacros", 31 | dependencies: [ 32 | .product(name: "SwiftSyntaxMacros", package: "swift-syntax"), 33 | .product(name: "SwiftCompilerPlugin", package: "swift-syntax"), 34 | ] 35 | ), 36 | 37 | // Library that exposes a macro as part of its API, which is used in client programs. 38 | .target(name: "HexColorMacro", dependencies: ["HexColorMacroMacros"]), 39 | 40 | // A client of the library, which is able to use the macro in its own code. 41 | .executableTarget(name: "HexColorMacroClient", dependencies: ["HexColorMacro"]), 42 | 43 | // A test target used to develop the macro implementation. 44 | .testTarget( 45 | name: "HexColorMacroTests", 46 | dependencies: [ 47 | "HexColorMacroMacros", 48 | .product(name: "SwiftSyntaxMacrosTestSupport", package: "swift-syntax"), 49 | ] 50 | ), 51 | ], 52 | swiftLanguageModes: [.v6] 53 | ) 54 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # Swift Macro Hex Color 2 | 3 | A macro that expands a hexadecimal string into a floating-point color value. 4 | 5 | ## Requirements 6 | 7 | Swift 5.9 8 | 9 | ## SwiftUI 10 | 11 | ```swift 12 | #hexColor("#BA43F1") 13 | 14 | // Color(.sRGB, red: 0.7294117647058823, green: 0.2627450980392157, blue: 0.9450980392156862, opacity: 1) 15 | ``` 16 | 17 | ```swift 18 | #hexColor("#BA43F1", colorSpace: .displayP3) 19 | 20 | // Color(.displayP3, red: 0.7294117647058823, green: 0.2627450980392157, blue: 0.9450980392156862, opacity: 1) 21 | ``` 22 | 23 | ```swift 24 | #hexColor("#BA43F1", opacity: 1, colorSpace: .displayP3) 25 | 26 | // Color(.displayP3, red: 0.7294117647058823, green: 0.2627450980392157, blue: 0.9450980392156862, opacity: 1) 27 | ``` 28 | 29 | ## UIKit 30 | 31 | ```swift 32 | #hexUIColorSRGB("#556421") 33 | // UIColor(red: 0.3333333333333333, green: 0.39215686274509803, blue: 0.12941176470588237, alpha: 1) 34 | 35 | #hexUIColorSRGB("#556421", opacity: 1) 36 | 37 | #hexUIColorP3("#556421") 38 | // UIColor(displayP3Red: 0.3333333333333333, green: 0.39215686274509803, blue: 0.12941176470588237, alpha: 1) 39 | 40 | #hexUIColorP3("#556421", opacity: 1) 41 | ``` 42 | -------------------------------------------------------------------------------- /Sources/HexColorMacro/HexColorMacro.swift: -------------------------------------------------------------------------------- 1 | 2 | @freestanding(expression) 3 | public macro hexToRGB(_ hexString: StaticString) -> (r: Double, g: Double, b: Double) = #externalMacro(module: "HexColorMacroMacros", type: "HexToRGBMacro") 4 | 5 | #if canImport(SwiftUI) 6 | import SwiftUI 7 | 8 | @freestanding(expression) 9 | public macro hexColor(_ hexString: StaticString, opacity: Double = 1, colorSpace: Color.RGBColorSpace = .sRGB) -> SwiftUI.Color = #externalMacro(module: "HexColorMacroMacros", type: "HexToColorMacro") 10 | 11 | #endif 12 | 13 | #if canImport(UIKit) 14 | import UIKit 15 | 16 | @freestanding(expression) 17 | public macro hexUIColorSRGB(_ hexString: StaticString, opacity: CGFloat = 1) -> UIColor = #externalMacro(module: "HexColorMacroMacros", type: "HexToUIColorSRGBMacro") 18 | 19 | @freestanding(expression) 20 | public macro hexUIColorP3(_ hexString: StaticString, opacity: CGFloat = 1) -> UIColor = #externalMacro(module: "HexColorMacroMacros", type: "HexToUIColorP3Macro") 21 | 22 | #endif 23 | -------------------------------------------------------------------------------- /Sources/HexColorMacroClient/main.swift: -------------------------------------------------------------------------------- 1 | import HexColorMacro 2 | import SwiftUI 3 | 4 | _ = #hexColor("#BA43F1") 5 | 6 | _ = #hexColor("#BA43F1", colorSpace: .displayP3) 7 | 8 | _ = #hexColor("#BA43F1", opacity: 1, colorSpace: .displayP3) 9 | 10 | #if canImport(UIKit) 11 | 12 | #hexUIColorSRGB("#556421") 13 | 14 | #hexUIColorSRGB("#556421", opacity: 1) 15 | 16 | #hexUIColorP3("#556421") 17 | 18 | #hexUIColorP3("#556421", opacity: 1) 19 | 20 | #endif 21 | -------------------------------------------------------------------------------- /Sources/HexColorMacroMacros/HexColorMacroMacro.swift: -------------------------------------------------------------------------------- 1 | import SwiftCompilerPlugin 2 | import SwiftSyntax 3 | import SwiftSyntaxBuilder 4 | import SwiftSyntaxMacros 5 | import Foundation 6 | 7 | enum MacroError: Error { 8 | case notFoundHex 9 | case failedToParseHex 10 | } 11 | 12 | func hexStringToRGB(_ hex: String) -> (r: Double, g: Double, b: Double)? { 13 | 14 | // https://stackoverflow.com/a/27203691 15 | 16 | var cString: String = hex.trimmingCharacters(in: .whitespacesAndNewlines).uppercased() 17 | 18 | if (cString.hasPrefix("#")) { 19 | cString.remove(at: cString.startIndex) 20 | } 21 | 22 | if ((cString.count) != 6) { 23 | return nil 24 | } 25 | 26 | var rgbValue: UInt64 = 0 27 | Scanner(string: cString).scanHexInt64(&rgbValue) 28 | 29 | return ( 30 | Double((rgbValue & 0xFF0000) >> 16) / 255.0, 31 | Double((rgbValue & 0x00FF00) >> 8) / 255.0, 32 | Double(rgbValue & 0x0000FF) / 255.0 33 | ) 34 | 35 | } 36 | 37 | func hexString(from stringLiteral: StringLiteralExprSyntax) -> String { 38 | guard case .stringSegment(let segment) = stringLiteral.segments.first else { 39 | fatalError("macro signature is wrong") 40 | } 41 | 42 | // easier way, no safety. 43 | let hexString = segment.content.text 44 | return hexString 45 | } 46 | 47 | public struct HexToRGBMacro: ExpressionMacro { 48 | public static func expansion( 49 | of node: some FreestandingMacroExpansionSyntax, 50 | in context: some MacroExpansionContext 51 | ) -> ExprSyntax { 52 | 53 | guard let argument = node.argumentList.first?.expression else { 54 | fatalError("compiler bug: the macro does not have any arguments") 55 | } 56 | 57 | guard let stringLiteral = argument.as(StringLiteralExprSyntax.self) else { 58 | fatalError("macro signature is wrong") 59 | } 60 | 61 | // easier way, no safety. 62 | let hexString = hexString(from: stringLiteral) 63 | guard let rgb = hexStringToRGB(hexString) else { 64 | fatalError("invalid hex string") 65 | } 66 | 67 | #if false 68 | // using bit-pattern 69 | return "(r: Double(bitPattern: \(raw: rgb.r.bitPattern)), g: Double(bitPattern: \(raw: rgb.g.bitPattern)), b: Double(bitPattern: \(raw: rgb.b.bitPattern)))" 70 | #else 71 | return "(r: \(raw: rgb.r.description), g: \(raw: rgb.g.description), b: \(raw: rgb.b.description))" 72 | #endif 73 | } 74 | } 75 | 76 | public struct HexToColorMacro: ExpressionMacro { 77 | public static func expansion( 78 | of node: some FreestandingMacroExpansionSyntax, 79 | in context: some MacroExpansionContext 80 | ) -> ExprSyntax { 81 | 82 | var args = node.argumentList.makeIterator() 83 | guard let arg_hex = args.next()?.expression else { 84 | context.addDiagnostics(from: MacroError.notFoundHex, node: node) 85 | return "" 86 | } 87 | let arg_opacity = argument(for: "opacity", in: node.argumentList)?.expression 88 | let arg_colorSpace = argument(for: "colorSpace", in: node.argumentList)?.expression 89 | 90 | guard let stringLiteral = arg_hex.as(StringLiteralExprSyntax.self) else { 91 | context.addDiagnostics(from: MacroError.notFoundHex, node: node) 92 | return "" 93 | } 94 | 95 | let hexString = hexString(from: stringLiteral) 96 | guard let rgb = hexStringToRGB(hexString) else { 97 | context.addDiagnostics(from: MacroError.failedToParseHex, node: node) 98 | return "" 99 | } 100 | 101 | return """ 102 | // \(raw: hexString) 103 | Color(\(arg_colorSpace ?? ".sRGB"), red: \(raw: rgb.r.description), green: \(raw: rgb.g.description), blue: \(raw: rgb.b.description), opacity: \(arg_opacity ?? "1")) 104 | """ 105 | } 106 | } 107 | 108 | public struct HexToUIColorSRGBMacro: ExpressionMacro { 109 | public static func expansion( 110 | of node: some FreestandingMacroExpansionSyntax, 111 | in context: some MacroExpansionContext 112 | ) -> ExprSyntax { 113 | 114 | var args = node.argumentList.makeIterator() 115 | let arg_hex = args.next()!.expression 116 | let arg_opacity = argument(for: "opacity", in: node.argumentList)?.expression 117 | 118 | guard let stringLiteral = arg_hex.as(StringLiteralExprSyntax.self) else { 119 | fatalError("macro signature is wrong") 120 | } 121 | 122 | let hexString = hexString(from: stringLiteral) 123 | guard let rgb = hexStringToRGB(hexString) else { 124 | context.addDiagnostics(from: MacroError.failedToParseHex, node: node) 125 | return "" 126 | } 127 | 128 | return """ 129 | // \(raw: hexString) 130 | UIColor(red: \(raw: rgb.r.description), green: \(raw: rgb.g.description), blue: \(raw: rgb.b.description), alpha: \(arg_opacity ?? "1")) 131 | """ 132 | } 133 | } 134 | 135 | public struct HexToUIColorP3Macro: ExpressionMacro { 136 | public static func expansion( 137 | of node: some FreestandingMacroExpansionSyntax, 138 | in context: some MacroExpansionContext 139 | ) -> ExprSyntax { 140 | 141 | var args = node.argumentList.makeIterator() 142 | let arg_hex = args.next()!.expression 143 | let arg_opacity = argument(for: "opacity", in: node.argumentList)?.expression 144 | 145 | guard let stringLiteral = arg_hex.as(StringLiteralExprSyntax.self) else { 146 | fatalError("macro signature is wrong") 147 | } 148 | 149 | let hexString = hexString(from: stringLiteral) 150 | guard let rgb = hexStringToRGB(hexString) else { 151 | context.addDiagnostics(from: MacroError.failedToParseHex, node: node) 152 | return "" 153 | } 154 | 155 | return """ 156 | // \(raw: hexString) 157 | UIColor(displayP3Red: \(raw: rgb.r.description), green: \(raw: rgb.g.description), blue: \(raw: rgb.b.description), alpha: \(arg_opacity ?? "1")) 158 | """ 159 | } 160 | } 161 | 162 | func argument(for label: String, in arugments: LabeledExprListSyntax) -> LabeledExprListSyntax.Element? { 163 | arugments.first { $0.label?.description == label } 164 | } 165 | 166 | @main 167 | struct HexColorMacroPlugin: CompilerPlugin { 168 | let providingMacros: [Macro.Type] = [ 169 | HexToColorMacro.self, 170 | HexToRGBMacro.self, 171 | HexToUIColorSRGBMacro.self, 172 | HexToUIColorP3Macro.self, 173 | 174 | ] 175 | } 176 | -------------------------------------------------------------------------------- /Tests/HexColorMacroTests/HexColorMacroTests.swift: -------------------------------------------------------------------------------- 1 | import SwiftSyntaxMacros 2 | import SwiftSyntaxMacrosTestSupport 3 | import XCTest 4 | 5 | // Macro implementations build for the host, so the corresponding module is not available when cross-compiling. Cross-compiled tests may still make use of the macro itself in end-to-end tests. 6 | #if canImport(HexColorMacroMacros) 7 | import HexColorMacroMacros 8 | 9 | let testMacros: [String: Macro.Type] = [ 10 | "hexColor": HexToColorMacro.self, 11 | "hexRGB": HexToRGBMacro.self, 12 | "hexUIColorSRGB": HexToUIColorSRGBMacro.self, 13 | "hexUIColorP3": HexToUIColorP3Macro.self, 14 | ] 15 | #endif 16 | 17 | final class HexColorMacroTests: XCTestCase { 18 | func testMacro() throws { 19 | #if canImport(HexColorMacroMacros) 20 | assertMacroExpansion( 21 | """ 22 | #hexColor("#FFFFFF", opacity: 1) 23 | """, 24 | expandedSource: """ 25 | Color(.sRGB, red: 1.0, green: 1.0, blue: 1.0, opacity: 1) 26 | """, 27 | macros: testMacros 28 | ) 29 | #else 30 | throw XCTSkip("macros are only supported when running tests for the host platform") 31 | #endif 32 | } 33 | 34 | func testHexToUIColorSRGB() throws { 35 | 36 | #if canImport(HexColorMacroMacros) 37 | assertMacroExpansion( 38 | """ 39 | #hexUIColorSRGB("#FFFFFF", opacity: 1) 40 | """, 41 | expandedSource: """ 42 | UIColor(red: 1.0, green: 1.0, blue: 1.0, alpha: 1) 43 | """, 44 | macros: testMacros 45 | ) 46 | #else 47 | throw XCTSkip("macros are only supported when running tests for the host platform") 48 | #endif 49 | 50 | } 51 | 52 | func testHexToUIColorP3() throws { 53 | #if canImport(HexColorMacroMacros) 54 | assertMacroExpansion( 55 | """ 56 | #hexUIColorP3("#FFFFFF", opacity: 1) 57 | """, 58 | expandedSource: """ 59 | UIColor(displayP3Red: 1.0, green: 1.0, blue: 1.0, alpha: 1) 60 | """, 61 | macros: testMacros 62 | ) 63 | #else 64 | throw XCTSkip("macros are only supported when running tests for the host platform") 65 | #endif 66 | 67 | } 68 | 69 | 70 | func testHexToRGB() throws { 71 | 72 | #if canImport(HexColorMacroMacros) 73 | assertMacroExpansion( 74 | """ 75 | #hexRGB("#0600FF") 76 | """, 77 | expandedSource: """ 78 | (r: 0.023529411764705882, g: 0.0, b: 1.0) 79 | """, 80 | macros: testMacros 81 | ) 82 | #else 83 | throw XCTSkip("macros are only supported when running tests for the host platform") 84 | #endif 85 | 86 | 87 | } 88 | } 89 | --------------------------------------------------------------------------------