feat: added sequence coding helper

Author: soumyamahunt

.github/config/spellcheck-wordlist.txt

@@ -53,3 +53,4 @@ typealias
 customizable
 enum
 enums
+conformances

Package.swift

@@ -70,8 +70,7 @@ let package = Package(
         .testTarget(
             name: "MetaCodableTests",
             dependencies: [
-                "PluginCore", "ProtocolGen",
-                "MacroPlugin", "MetaCodable", "HelperCoders",
+                "PluginCore", "MacroPlugin", "MetaCodable", "HelperCoders",
                 .product(name: "SwiftSyntaxMacrosTestSupport", package: "swift-syntax"),
             ],
             plugins: ["MetaProtocolCodable"]

Plugins/MetaProtocolCodable/Config.swift

@@ -38,8 +38,9 @@ extension Config: Codable {
     /// - Parameter decoder: The decoder to read data from.
     init(from decoder: Decoder) throws {
         let container = try decoder.container(keyedBy: CodingKeys.self)
-        self.scan = try container.decodeIfPresent(
-            ScanMode.self, forKey: .scan
-        ) ?? .target
+        self.scan =
+            try container.decodeIfPresent(
+                ScanMode.self, forKey: .scan
+            ) ?? .target
     }
 }

Plugins/MetaProtocolCodable/Plugin.swift

@@ -30,14 +30,20 @@ struct MetaProtocolCodable: BuildToolPlugin {
             return name == "metacodableconfig"
         }
         guard let file else { return .init(scan: .target) }
-        let path = if #available(macOS 13, *) {
-            URL(filePath: target.directory.appending([file]).string)
-        } else {
-            URL(fileURLWithPath: target.directory.appending([file]).string)
-        }
-        let (conf, _) = try await URLSession.shared.data(from: path)
+        let pathStr = target.directory.appending([file]).string
+        #if canImport(Darwin)
+        let path =
+            if #available(macOS 13, *) {
+                URL(filePath: pathStr)
+            } else {
+                URL(fileURLWithPath: pathStr)
+            }
+        #else
+        let path = URL(fileURLWithPath: pathStr)
+        #endif
+        let conf = try Data(contentsOf: path)
         let pConf = try? PropertyListDecoder().decode(Config.self, from: conf)
-        let config = try pConf ??  JSONDecoder().decode(Config.self, from: conf)
+        let config = try pConf ?? JSONDecoder().decode(Config.self, from: conf)
         return config
     }
 
@@ -77,8 +83,8 @@ struct MetaProtocolCodable: BuildToolPlugin {
                 intermFiles.append(genFile)
                 return Command.buildCommand(
                     displayName: """
-                    Parse source file "\(fileName)" in module "\(moduleName)"
-                    """,
+                        Parse source file "\(fileName)" in module "\(moduleName)"
+                        """,
                     executable: tool.path,
                     arguments: [
                         "parse",
@@ -103,15 +109,17 @@ struct MetaProtocolCodable: BuildToolPlugin {
         for file in intermFiles {
             genArgs.append(file.string)
         }
-        buildCommands.append(.buildCommand(
+        buildCommands.append(
+            .buildCommand(
                 displayName: """
-                Generate protocol decoding/encoding syntax for "\(moduleName)"
-                """,
+                    Generate protocol decoding/encoding syntax for "\(moduleName)"
+                    """,
                 executable: tool.path,
                 arguments: genArgs,
                 inputFiles: intermFiles,
                 outputFiles: [genPath]
-        ))
+            )
+        )
         return buildCommands
     }
 }

README.md

@@ -242,7 +242,7 @@ You can even create your own by conforming to `HelperCoder`.
 </details>
 
 <details>
-  <summary>Represent data with variations in the form of external/internal/adjacent tagging, with single enum with each case as a variation or a protocol type that varies with conformances accross modules.</summary>
+  <summary>Represent data with variations in the form of external/internal/adjacent tagging, with single enum with each case as a variation or a protocol type that varies with conformances across modules.</summary>
 
  i.e. while `Swift` compiler only generates implementation assuming external tagged enums, only following data:
 

Sources/HelperCoders/HelperCoders.docc/HelperCoders.md

@@ -62,3 +62,7 @@ Level up ``/MetaCodable``'s generated implementations with helpers assisting com
 - ``PropertyWrapperCoder``
 - ``PropertyWrappable``
 - ``ConditionalCoder``
+
+### Sequence
+
+- ``SequenceCoder``

Sources/HelperCoders/SequenceCoder/DefaultSequenceElementCoding.swift

@@ -0,0 +1,139 @@
+import MetaCodable
+
+/// An ``/MetaCodable/HelperCoder`` that performs default decoding/encoding.
+///
+/// This type doesn't provide any customization and used only to opt out of
+/// decoding/encoding customizations.
+@_documentation(visibility:internal)
+public struct DefaultSequenceElementCoding<Coded: Codable>: HelperCoder {
+    /// Decodes value from the given `decoder`.
+    ///
+    /// Decodes the data using type's `Decodable` implementation.
+    ///
+    /// - Parameter decoder: The decoder to read data from.
+    /// - Returns: The decoded value.
+    /// - Throws: If decoding fails due to corrupted or invalid data.
+    @inlinable
+    public func decode(from decoder: Decoder) throws -> Coded {
+        return try Coded(from: decoder)
+    }
+
+    /// Decodes optional value from the given `decoder`.
+    ///
+    /// Decodes the data using optional type's `Decodable` implementation.
+    ///
+    /// - Parameter decoder: The decoder to read data from.
+    /// - Returns: The optional decoded value.
+    /// - Throws: If decoding fails due to corrupted or invalid data.
+    @inlinable
+    public func decodeIfPresent(from decoder: Decoder) throws -> Coded? {
+        return try Coded?(from: decoder)
+    }
+
+    /// Decodes value of the from the given `container` and specified `key`.
+    ///
+    /// Uses container's default `decode(_:forKey:)` implementation
+    /// to get value from the `container` at the specified `key`.
+    ///
+    /// - Parameters:
+    ///   - container: The container to read data from.
+    ///   - key: The key for the value decoded.
+    ///
+    /// - Returns: The decoded value.
+    /// - Throws: If decoding fails due to corrupted or invalid data.
+    @inlinable
+    public func decode<DecodingContainer: KeyedDecodingContainerProtocol>(
+        from container: DecodingContainer,
+        forKey key: DecodingContainer.Key
+    ) throws -> Coded {
+        return try container.decode(Coded.self, forKey: key)
+    }
+
+    /// Decodes optional value of the from the given `container` and
+    /// specified `key`.
+    ///
+    /// Uses container's default `decodeIfPresent(_:forKey:)` implementation
+    /// to get value from the `container` at the specified `key`.
+    ///
+    /// - Parameters:
+    ///   - container: The container to read data from.
+    ///   - key: The key for the value decoded.
+    ///
+    /// - Returns: The optional decoded value.
+    /// - Throws: If decoding fails due to corrupted or invalid data.
+    @inlinable
+    public func decodeIfPresent<DecodingContainer>(
+        from container: DecodingContainer, forKey key: DecodingContainer.Key
+    ) throws -> Coded? where DecodingContainer: KeyedDecodingContainerProtocol {
+        return try container.decodeIfPresent(Coded.self, forKey: key)
+    }
+
+    /// Encodes given value to the provided `encoder`.
+    ///
+    /// Decodes the value using type's `Encodable` implementation.
+    ///
+    /// - Parameters:
+    ///   - value: The value to encode.
+    ///   - encoder: The encoder to write data to.
+    ///
+    /// - Throws: If any values are invalid for the given encoder’s format.
+    @inlinable
+    public func encode(_ value: Coded, to encoder: Encoder) throws {
+        try value.encode(to: encoder)
+    }
+
+    /// Encodes given optional value to the provided `encoder`.
+    ///
+    /// Decodes the optional value using optional type's `Encodable`
+    /// implementation.
+    ///
+    /// - Parameters:
+    ///   - value: The value to encode.
+    ///   - encoder: The encoder to write data to.
+    ///
+    /// - Throws: If any values are invalid for the given encoder’s format.
+    @inlinable
+    public func encodeIfPresent(_ value: Coded?, to encoder: Encoder) throws {
+        try value.encode(to: encoder)
+    }
+
+    /// Encodes given value of to the provided `container` at the specified
+    /// `key`.
+    ///
+    /// Uses container's default `encode(_:forKey:)` implementation
+    /// to write value to the `container` at the specified `key`.
+    ///
+    /// - Parameters:
+    ///   - value: The value to encode.
+    ///   - container: The container to write data to.
+    ///   - key: The key to write data at.
+    ///
+    /// - Throws: If any values are invalid for the given encoder’s format.
+    @inlinable
+    public func encode<EncodingContainer: KeyedEncodingContainerProtocol>(
+        _ value: Coded, to container: inout EncodingContainer,
+        atKey key: EncodingContainer.Key
+    ) throws {
+        try container.encode(value, forKey: key)
+    }
+
+    /// Encodes given optional value of to the provided `container`
+    ///  at the specified `key`.
+    ///
+    /// Uses container's default `encodeIfPresent(_:forKey:)` implementation
+    /// to write optional value to the `container` at the specified `key`.
+    ///
+    /// - Parameters:
+    ///   - value: The value to encode.
+    ///   - container: The container to write data to.
+    ///   - key: The key to write data at.
+    ///
+    /// - Throws: If any values are invalid for the given encoder’s format.
+    @inlinable
+    public func encodeIfPresent<EncodingContainer>(
+        _ value: Coded?, to container: inout EncodingContainer,
+        atKey key: EncodingContainer.Key
+    ) throws where EncodingContainer: KeyedEncodingContainerProtocol {
+        try container.encodeIfPresent(value, forKey: key)
+    }
+}