Initial commit

.gitignore

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+.DS_Store
+/.build
+/Packages
+xcuserdata/
+DerivedData/
+.swiftpm/configuration/registries.json
+.swiftpm/xcode/package.xcworkspace/contents.xcworkspacedata
+.netrc

LICENSE.md

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+MIT License
+
+Copyright (c) 2024 Jia-Han Wu
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

Package.swift

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+// swift-tools-version: 5.10
+// The swift-tools-version declares the minimum version of Swift required to build this package.
+
+import PackageDescription
+
+let package = Package(
+    name: "swiftui-code39",
+    platforms: [
+        .iOS(.v15),
+        .macOS(.v12),
+    ],
+    products: [
+        .library(
+            name: "Code39",
+            targets: ["Code39"]
+        ),
+    ],
+    targets: [
+        .target(name: "Code39"),
+    ]
+)

README.md

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+# SwiftUI Code39
+
+SwiftUI Code39 is a Swift package that provides an easy way to generate Code 39 barcodes in your SwiftUI applications.
+
+## Installation
+
+To use SwiftUI Code39 in your project, add the following line to your `Package.swift` file:
+
+```swift
+dependencies: [
+    .package(url: "https://github.com/jiahan-wu/swiftui-code39.git", from: "1.0.0")
+]
+```
+
+Then, import the package in your Swift code:
+
+```swift
+import Code39
+```
+
+## Usage
+
+To generate a Code 39 barcode, simply create an instance of `Code39View` and provide the desired content as a string:
+
+```swift
+struct ContentView: View {
+    var body: some View {
+        Code39View("HELLO WORLD")
+            .frame(width: 296, height: 96)
+    }
+}
+```
+
+## Important Note
+
+It is the responsibility of the library user to ensure that the content passed to `Code39View` consists of valid characters supported by Code 39. You can use the `code39SupportedCharacters` set to check if a character is supported:
+
+```swift
+let content = "HELLO"
+let isValid = content.allSatisfy { code39SupportedCharacters.contains($0) }
+```
+
+## License
+
+SwiftUI Code39 is released under the MIT License. See the `LICENSE` file for more information.
+
+## Contributing
+
+Contributions to SwiftUI Code39 are welcome! If you find any issues or have suggestions for improvements, please open an issue or submit a pull request on the GitHub repository.

Sources/Code39/Code39.swift

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+// The Swift Programming Language
+//
+//  Code39.swift
+//
+//
+//  Created by Jia-Han Wu on 2024/5/4.
+//
+
+enum BarWidth {
+    case narrow
+    case wide
+}
+
+let code39Patterns: [Character: [BarWidth]] = [
+    " ": [.narrow,   .wide,   .wide, .narrow, .narrow, .narrow,   .wide, .narrow, .narrow],
+    "$": [.narrow,   .wide, .narrow,   .wide, .narrow,   .wide, .narrow, .narrow, .narrow],
+    "%": [.narrow, .narrow, .narrow,   .wide, .narrow,   .wide, .narrow,   .wide, .narrow],
+    "*": [.narrow,   .wide, .narrow, .narrow,   .wide, .narrow,   .wide, .narrow, .narrow],
+    "+": [.narrow,   .wide, .narrow, .narrow, .narrow,   .wide, .narrow,   .wide, .narrow],
+    "-": [.narrow,   .wide, .narrow, .narrow, .narrow, .narrow,   .wide, .narrow,   .wide],
+    ".": [  .wide,   .wide, .narrow, .narrow, .narrow, .narrow,   .wide, .narrow, .narrow],
+    "/": [.narrow,   .wide, .narrow,   .wide, .narrow, .narrow, .narrow,   .wide, .narrow],
+    "0": [.narrow, .narrow, .narrow,   .wide,   .wide, .narrow,   .wide, .narrow, .narrow],
+    "1": [  .wide, .narrow, .narrow,   .wide, .narrow, .narrow, .narrow, .narrow,   .wide],
+    "2": [.narrow, .narrow,   .wide,   .wide, .narrow, .narrow, .narrow, .narrow,   .wide],
+    "3": [  .wide, .narrow,   .wide,   .wide, .narrow, .narrow, .narrow, .narrow, .narrow],
+    "4": [.narrow, .narrow, .narrow,   .wide,   .wide, .narrow, .narrow, .narrow,   .wide],
+    "5": [  .wide, .narrow, .narrow,   .wide,   .wide, .narrow, .narrow, .narrow, .narrow],
+    "6": [.narrow, .narrow,   .wide,   .wide,   .wide, .narrow, .narrow, .narrow, .narrow],
+    "7": [.narrow, .narrow, .narrow,   .wide, .narrow, .narrow,   .wide, .narrow,   .wide],
+    "8": [  .wide, .narrow, .narrow,   .wide, .narrow, .narrow,   .wide, .narrow, .narrow],
+    "9": [.narrow, .narrow,   .wide,   .wide, .narrow, .narrow,   .wide, .narrow, .narrow],
+    "A": [  .wide, .narrow, .narrow, .narrow, .narrow,   .wide, .narrow, .narrow,   .wide],
+    "B": [.narrow, .narrow,   .wide, .narrow, .narrow,   .wide, .narrow, .narrow,   .wide],
+    "C": [  .wide, .narrow,   .wide, .narrow, .narrow,   .wide, .narrow, .narrow, .narrow],
+    "D": [.narrow, .narrow, .narrow, .narrow,   .wide,   .wide, .narrow, .narrow,   .wide],
+    "E": [  .wide, .narrow, .narrow, .narrow,   .wide,   .wide, .narrow, .narrow, .narrow],
+    "F": [.narrow, .narrow,   .wide, .narrow,   .wide,   .wide, .narrow, .narrow, .narrow],
+    "G": [.narrow, .narrow, .narrow, .narrow, .narrow,   .wide,   .wide, .narrow,   .wide],
+    "H": [  .wide, .narrow, .narrow, .narrow, .narrow,   .wide,   .wide, .narrow, .narrow],
+    "I": [.narrow, .narrow,   .wide, .narrow, .narrow,   .wide,   .wide, .narrow, .narrow],
+    "J": [.narrow, .narrow, .narrow, .narrow,   .wide,   .wide,   .wide, .narrow, .narrow],
+    "K": [  .wide, .narrow, .narrow, .narrow, .narrow, .narrow, .narrow,   .wide,   .wide],
+    "L": [.narrow, .narrow,   .wide, .narrow, .narrow, .narrow, .narrow,   .wide,   .wide],
+    "M": [  .wide, .narrow,   .wide, .narrow, .narrow, .narrow, .narrow,   .wide, .narrow],
+    "N": [.narrow, .narrow, .narrow, .narrow,   .wide, .narrow, .narrow,   .wide,   .wide],
+    "O": [  .wide, .narrow, .narrow, .narrow,   .wide, .narrow, .narrow,   .wide, .narrow],
+    "P": [.narrow, .narrow,   .wide, .narrow,   .wide, .narrow, .narrow,   .wide, .narrow],
+    "Q": [.narrow, .narrow, .narrow, .narrow, .narrow, .narrow,   .wide,   .wide,   .wide],
+    "R": [  .wide, .narrow, .narrow, .narrow, .narrow, .narrow,   .wide,   .wide, .narrow],
+    "S": [.narrow, .narrow,   .wide, .narrow, .narrow, .narrow,   .wide,   .wide, .narrow],
+    "T": [.narrow, .narrow, .narrow, .narrow,   .wide, .narrow,   .wide,   .wide, .narrow],
+    "U": [  .wide,   .wide, .narrow, .narrow, .narrow, .narrow, .narrow, .narrow,   .wide],
+    "V": [.narrow,   .wide,   .wide, .narrow, .narrow, .narrow, .narrow, .narrow,   .wide],
+    "W": [  .wide,   .wide,   .wide, .narrow, .narrow, .narrow, .narrow, .narrow, .narrow],
+    "X": [.narrow,   .wide, .narrow, .narrow,   .wide, .narrow, .narrow, .narrow,   .wide],
+    "Y": [  .wide,   .wide, .narrow, .narrow,   .wide, .narrow, .narrow, .narrow, .narrow],
+    "Z": [.narrow,   .wide,   .wide, .narrow,   .wide, .narrow, .narrow, .narrow, .narrow],
+]
+
+func encodeToCode39(_ input: String) -> [BarWidth] {
+    var encodedBarcode: [BarWidth] = []
+
+    encodedBarcode.append(contentsOf: code39Patterns["*"]!)
+    encodedBarcode.append(.narrow)
+
+    for character in input {
+        encodedBarcode.append(contentsOf: code39Patterns[character]!)
+        encodedBarcode.append(.narrow)
+    }
+
+    encodedBarcode.append(contentsOf: code39Patterns["*"]!)
+
+    return encodedBarcode
+}
+
+public let code39SupportedCharacters: Set<Character> = Set(code39Patterns.keys)

Sources/Code39/Code39View.swift

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+//
+//  Code39View.swift
+//
+//
+//  Created by Jia-Han Wu on 2024/5/4.
+//
+
+import SwiftUI
+
+public struct Code39View: View {
+
+    private let barcode: [BarWidth]
+
+    public init(_ content: String) {
+        self.barcode = encodeToCode39(content)
+    }
+
+    public var body: some View {
+        Canvas { context, size in
+            let intercharacterGapCount = barcode.count % 9
+            let narrowBarWidth = size.width / CGFloat(((((barcode.count - intercharacterGapCount) / 9) * 15) + intercharacterGapCount))
+            var currentX: CGFloat = 0
+            for (index, barWidth) in barcode.enumerated() {
+                let barColor: Color = index % 2 == 0 ? .black : .white
+                let barWidth: CGFloat = barWidth == .narrow ? narrowBarWidth : narrowBarWidth * 3
+                var barPath = Path()
+                let barRect = CGRect(x: currentX,
+                                     y: 0,
+                                     width: barWidth,
+                                     height: size.height)
+                currentX += barWidth
+                barPath.addRect(barRect)
+                context.fill(barPath, with: .color(barColor))
+            }
+        }
+    }
+}