Add enum stubs

Sources/Rubicon/Domain/EnumDeclaration.swift

@@ -0,0 +1,6 @@
+public struct EnumDeclaration: Equatable {
+    public let name: String
+    public let cases: [String]
+    public let notes: [String]
+    public let accessLevel: AccessLevel
+}

Sources/Rubicon/Generator/EnumStubGenerator.swift

@@ -0,0 +1,66 @@
+public protocol EnumStubGenerator {
+    func generate(from enumType: EnumDeclaration, functionName: String) -> String
+}
+
+final class EnumStubGeneratorImpl: EnumStubGenerator {
+    private let extensionGenerator: ExtensionGenerator
+    private let functionGenerator: FunctionGenerator
+    private let indentationGenerator: IndentationGenerator
+    private let defaultValueGenerator: DefaultValueGenerator
+
+    init(
+        extensionGenerator: ExtensionGenerator,
+        functionGenerator: FunctionGenerator,
+        indentationGenerator: IndentationGenerator,
+        defaultValueGenerator: DefaultValueGenerator
+    ) {
+        self.extensionGenerator = extensionGenerator
+        self.functionGenerator = functionGenerator
+        self.indentationGenerator = indentationGenerator
+        self.defaultValueGenerator = defaultValueGenerator
+    }
+
+    func generate(from enumType: EnumDeclaration, functionName: String) -> String {
+        let content = generateBody(from: enumType, functionName: functionName)
+        return extensionGenerator.make(
+            name: enumType.name,
+            content: content
+        ).joined(separator: "\n") + "\n"
+    }
+
+    private func generateBody(from enumType: EnumDeclaration, functionName: String) -> [String] {
+        let content = makeContent(from: enumType)
+        let functionDeclaration = FunctionDeclaration(
+            name: functionName,
+            arguments: [],
+            isThrowing: false,
+            isAsync: false,
+            isStatic: true,
+            returnType: TypeDeclaration(name: enumType.name, prefix: [], composedType: .plain)
+        )
+        return functionGenerator.makeCode(
+            from: functionDeclaration,
+            content: content,
+            isEachArgumentOnNewLineEnabled: true
+        )
+    }
+
+    private func makeContent(from enumType: EnumDeclaration) -> [String] {
+        let firstCase = enumType.cases.first.map { "." + $0 } ?? ""
+        return [
+            "return \(firstCase)"
+        ]
+    }
+
+    private func makeAssigment(of variable: VarDeclaration, isLast: Bool) -> String {
+        return "\(variable.identifier): \(variable.identifier)\(isLast ? "" : ",")"
+    }
+
+    private func makeArgument(from varDeclaration: VarDeclaration) -> ArgumentDeclaration {
+        ArgumentDeclaration(
+            name: varDeclaration.identifier,
+            type: varDeclaration.type,
+            defaultValue: defaultValueGenerator.makeDefaultValue(for: varDeclaration)
+        )
+    }
+}

Sources/Rubicon/Integration/Rubicon.swift

@@ -279,4 +279,32 @@ public final class Rubicon {
             )
         )
     }
+
+    public func makeEnumParser() -> EnumParser {
+        return EnumParserImpl()
+    }
+
+    public func makeEnumGenerator(for configuration: StructStubConfiguration) -> EnumStubGenerator {
+        let dependencies = makeDependencies(
+            for: configuration.accessLevel,
+            indentStep: configuration.indentStep
+        )
+        return EnumStubGeneratorImpl(
+            extensionGenerator: ExtensionGeneratorImpl(
+                accessLevelGenerator: dependencies.accessLevelGenerator,
+                indentationGenerator: dependencies.indentationGenerator
+            ),
+            functionGenerator: FunctionGeneratorImpl(
+                accessLevelGenerator: dependencies.accessLevelGenerator,
+                typeGenerator: dependencies.typeGenerator,
+                argumentGenerator: dependencies.argumentGenerator,
+                indentationGenerator: dependencies.indentationGenerator
+            ),
+            indentationGenerator: dependencies.indentationGenerator,
+            defaultValueGenerator: DefaultValueGeneratorImpl(
+                unknownDefaultType: configuration.defaultValue,
+                customDefaultTypes: configuration.customDefaultValues
+            )
+        )
+    }
 }

Sources/Rubicon/Syntactic analysis/EnumParser.swift

@@ -0,0 +1,115 @@
+import SwiftParser
+import SwiftSyntax
+
+public protocol EnumParser {
+    func parse(text: String) throws -> [EnumDeclaration]
+}
+
+final class EnumParserImpl: EnumParser {
+    func parse(text: String) throws -> [EnumDeclaration] {
+        let text = SwiftParser.Parser.parse(source: text)
+        let visitor = EnumVisitor(
+            nestedInItemsNames: []
+        )
+        return visitor.execute(node: text)
+    }
+}
+
+private class EnumVisitor: SyntaxVisitor {
+    private var result = [EnumDeclaration]()
+    private var nestedInItemsNames: [String]
+
+    public init(
+        nestedInItemsNames: [String]
+    ) {
+        self.nestedInItemsNames = nestedInItemsNames
+        super.init(viewMode: .sourceAccurate)
+    }
+
+    func execute(node: some SyntaxProtocol) -> [EnumDeclaration] {
+        walk(node)
+        return result
+    }
+
+    override func visit(_ node: EnumDeclSyntax) -> SyntaxVisitorContinueKind {
+
+        let name = node.name.text
+
+        result.append(
+            EnumDeclaration(
+                name: (nestedInItemsNames + [name]).joined(separator: "."),
+                cases: parseCases(node: node.memberBlock),
+                notes: node.leadingTrivia.pieces.compactMap(makeLineComment),
+                accessLevel: parseAccessLevel(from: node)
+            )
+        )
+
+        let subVisitor = EnumVisitor(nestedInItemsNames: nestedInItemsNames + [name])
+        result += subVisitor.execute(node: node.memberBlock.members)
+
+        return .skipChildren
+    }
+
+    private func parseCases(node: MemberBlockSyntax) -> [String] {
+        let casesParser = CasesVisitor(viewMode: .sourceAccurate)
+        return casesParser.execute(node: node.members)
+    }
+
+    private func parseAccessLevel(from node: EnumDeclSyntax) -> AccessLevel {
+        let modifiers = node.modifiers.map { $0.name.tokenKind }
+
+        if modifiers.contains(.keyword(.public)) {
+            return .public
+        } else if modifiers.contains(.keyword(.private)) {
+            return .private
+        } else {
+            return .internal
+        }
+    }
+
+    private func makeLineComment(from triviaPiece: TriviaPiece) -> String? {
+        switch triviaPiece {
+        case .lineComment(let text):
+            text
+        default:
+            nil
+        }
+    }
+
+    private func parseParent(from inheridedTypeSyntax: InheritedTypeSyntax) -> String? {
+        guard let type = inheridedTypeSyntax.type.as(IdentifierTypeSyntax.self) else {
+            return nil
+        }
+
+        return type.name.text
+    }
+
+    override func visit(_ node: ClassDeclSyntax) -> SyntaxVisitorContinueKind {
+        let name = node.name.text
+        let subVisitor = EnumVisitor(nestedInItemsNames: nestedInItemsNames + [name])
+        result += subVisitor.execute(node: node.memberBlock.members)
+        return .skipChildren
+    }
+
+    override func visit(_ node: StructDeclSyntax) -> SyntaxVisitorContinueKind {
+        let name = node.name.text
+        let subVisitor = EnumVisitor(nestedInItemsNames: nestedInItemsNames + [name])
+        result += subVisitor.execute(node: node.memberBlock.members)
+        return .skipChildren
+    }
+}
+
+private class CasesVisitor: SyntaxVisitor {
+    private var result = [String]()
+
+    func execute(node: some SyntaxProtocol) -> [String] {
+        walk(node)
+        return result
+    }
+
+    override func visit(_ node: EnumCaseDeclSyntax) -> SyntaxVisitorContinueKind {
+        let declaration = node.elements.map(\.name.text)
+        result += declaration
+        return .visitChildren
+    }
+}

Tests/RubiconTests/Generator/EnumStubGeneratorTests.swift

@@ -0,0 +1,69 @@
+@testable import Rubicon
+import XCTest
+
+final class EnumStubGeneratorTests: XCTestCase {
+    private var extensionGeneratorSpy: ExtensionGeneratorSpy!
+    private var functionGeneratorSpy: FunctionGeneratorSpy!
+    private var indentationGeneratorStub: IndentationGeneratorStub!
+    private var defaultValueGeneratorSpy: DefaultValueGeneratorSpy!
+    private var sut: EnumStubGeneratorImpl!
+
+    override func setUp() {
+        super.setUp()
+        extensionGeneratorSpy = ExtensionGeneratorSpy(makeReturn: ["extension"])
+        functionGeneratorSpy = FunctionGeneratorSpy(makeCodeReturn: ["function"])
+        indentationGeneratorStub = IndentationGeneratorStub()
+        defaultValueGeneratorSpy = DefaultValueGeneratorSpy(makeDefaultValueReturn: "default")
+        sut = EnumStubGeneratorImpl(
+            extensionGenerator: extensionGeneratorSpy,
+            functionGenerator: functionGeneratorSpy,
+            indentationGenerator: IndentationGeneratorStub(),
+            defaultValueGenerator: defaultValueGeneratorSpy
+        )
+    }
+
+    func test_givenEmptyEnum_whenMakeCode_thenReturnCode() {
+        let declaration = EnumDeclaration.makeStub(cases: [])
+
+        let code = sut.generate(from: declaration, functionName: "functionName")
+
+        XCTAssertEqual(code, "extension\n")
+        XCTAssertEqual(extensionGeneratorSpy.make.count, 1)
+        XCTAssertEqual(extensionGeneratorSpy.make.first?.content, ["function"])
+        XCTAssertEqual(functionGeneratorSpy.makeCode.count, 1)
+        XCTAssertEqual(functionGeneratorSpy.makeCode.first?.declaration.name, "functionName")
+        XCTAssertEqual(functionGeneratorSpy.makeCode.first?.declaration.isThrowing, false)
+        XCTAssertEqual(functionGeneratorSpy.makeCode.first?.declaration.isAsync, false)
+        XCTAssertEqual(functionGeneratorSpy.makeCode.first?.declaration.isStatic, true)
+        XCTAssertEqual(functionGeneratorSpy.makeCode.first?.declaration.arguments.count, 0)
+        XCTAssertEqual(functionGeneratorSpy.makeCode.first?.declaration.returnType, .makeStub(name: "EnumName"))
+        XCTAssertEqual(functionGeneratorSpy.makeCode.first?.content, ["return "])
+    }
+
+    func test_givenVariableEnum_whenMakeCode_thenReturnCode() {
+        let declaration = EnumDeclaration.makeStub(cases: [
+            "a",
+            "b"
+        ])
+
+        _ = sut.generate(from: declaration, functionName: "functionName")
+
+        XCTAssertEqual(functionGeneratorSpy.makeCode.first?.content, ["return .a"])
+    }
+}
+
+extension EnumDeclaration {
+    static func makeStub(
+        cases: [String] = []
+    ) -> EnumDeclaration {
+        return EnumDeclaration(
+            name: "EnumName",
+            cases: cases,
+            notes: [
+                "note1",
+                "note2"
+            ],
+            accessLevel: .internal
+        )
+    }
+}