[Refactor] Introduce TranslatorContext (2/2) (#640)

### Motivation

Depends on #638, so
don't review until that lands.

Continuation of #638, broke up into multiple PRs for easier review.

Also a non-functional change, purely a refactoring.

### Modifications

Changed a bunch of TypeMatcher methods from static to being instance
methods, which gives them access to the translator context.

Moved a few other methods that depended on the static methods to be
extensions on the closest type that already has access to the context.

### Result

Now TypeAssigner/TypeMatcher can take runtime configuration, e.g.
through feature flags.

### Test Plan

All tests still pass.

Author: czechboy0

Sources/_OpenAPIGeneratorCore/Translator/CommonTranslations/translateAllAnyOneOf.swift

@@ -64,7 +64,7 @@ extension TypesFileTranslator {
                     parent: typeName
                 )
                 let associatedDeclarations: [Declaration]
-                if TypeMatcher.isInlinable(schema) {
+                if typeMatcher.isInlinable(schema) {
                     associatedDeclarations = try translateSchema(
                         typeName: propertyType.typeName,
                         schema: schema,
@@ -81,7 +81,7 @@ extension TypesFileTranslator {
                     context: context
                 )
                 var referenceStack = ReferenceStack.empty
-                let isKeyValuePairSchema = try TypeMatcher.isKeyValuePair(
+                let isKeyValuePairSchema = try typeMatcher.isKeyValuePair(
                     schema,
                     referenceStack: &referenceStack,
                     components: components
@@ -173,7 +173,7 @@ extension TypesFileTranslator {
                         parent: typeName
                     )
                     let associatedDeclarations: [Declaration]
-                    if TypeMatcher.isInlinable(schema) {
+                    if typeMatcher.isInlinable(schema) {
                         associatedDeclarations = try translateSchema(
                             typeName: childType.typeName,
                             schema: schema,
@@ -183,7 +183,7 @@ extension TypesFileTranslator {
                         associatedDeclarations = []
                     }
                     var referenceStack = ReferenceStack.empty
-                    let isKeyValuePair = try TypeMatcher.isKeyValuePair(
+                    let isKeyValuePair = try typeMatcher.isKeyValuePair(
                         schema,
                         referenceStack: &referenceStack,
                         components: components

Sources/_OpenAPIGeneratorCore/Translator/CommonTranslations/translateObjectStruct.swift

@@ -85,7 +85,7 @@ extension TypesFileTranslator {
                     parent: typeName
                 )
                 let associatedDeclarations: [Declaration]
-                if TypeMatcher.isInlinable(value) {
+                if typeMatcher.isInlinable(value) {
                     associatedDeclarations = try translateSchema(
                         typeName: propertyType.typeName,
                         schema: value,
@@ -153,7 +153,7 @@ extension TypesFileTranslator {
                 components: components,
                 inParent: parent
             )
-            if TypeMatcher.isInlinable(schema) {
+            if typeMatcher.isInlinable(schema) {
                 associatedDeclarations = try translateSchema(
                     typeName: valueTypeUsage.typeName,
                     schema: schema,

Sources/_OpenAPIGeneratorCore/Translator/Multipart/MultipartContent.swift

@@ -90,11 +90,11 @@ extension MultipartSchemaTypedContent {
     }
 }
 
-extension SchemaContent {
+extension TypeMatcher {
     /// Returns a Boolean value whether the schema is a multipart content type and is referenceable.
-    var isReferenceableMultipart: Bool {
-        guard contentType.isMultipart else { return false }
-        let ref = TypeMatcher.multipartElementTypeReferenceIfReferenceable(schema: schema, encoding: encoding)
+    func isReferenceableMultipart(_ content: SchemaContent) -> Bool {
+        guard content.contentType.isMultipart else { return false }
+        let ref = multipartElementTypeReferenceIfReferenceable(schema: content.schema, encoding: content.encoding)
         return ref == nil
     }
 }

Sources/_OpenAPIGeneratorCore/Translator/Multipart/translateMultipart.swift

@@ -76,7 +76,7 @@ extension TypesFileTranslator {
             inParent: typeName.appending(swiftComponent: nil, jsonComponent: "content")
         )
         let associatedDeclarations: [Declaration]
-        if TypeMatcher.isInlinable(schema) {
+        if typeMatcher.isInlinable(schema) {
             associatedDeclarations = try translateSchema(
                 typeName: bodyTypeUsage.typeName,
                 schema: schema,
@@ -117,7 +117,7 @@ extension TypesFileTranslator {
         schema: JSONSchema
     ) throws -> [Declaration] {
         let associatedDeclarations: [Declaration]
-        if TypeMatcher.isInlinable(schema) {
+        if typeMatcher.isInlinable(schema) {
             associatedDeclarations = try translateSchema(typeName: typeName, schema: schema, overrides: .none)
         } else {
             associatedDeclarations = []

Sources/_OpenAPIGeneratorCore/Translator/Parameters/TypedParameter.swift

@@ -57,22 +57,14 @@ extension TypedParameter {
     /// The location of the parameter in the HTTP request.
     var location: OpenAPI.Parameter.Context.Location { parameter.location }
 
-    /// A schema to be inlined.
-    ///
-    /// - Returns: Nil when schema is referenceable.
-    var inlineableSchema: JSONSchema? { schema.inlineableSchema }
-}
-
-extension UnresolvedSchema {
-
     /// A schema to be inlined.
     ///
     /// - Returns: Nil when schema is referenceable.
     var inlineableSchema: JSONSchema? {
-        switch self {
+        switch schema {
         case .a: return nil
         case let .b(schema):
-            if TypeMatcher.isInlinable(schema) { return schema }
+            if TypeMatcher(context: context).isInlinable(schema) { return schema }
             return nil
         }
     }

Sources/_OpenAPIGeneratorCore/Translator/RequestBody/translateRequestBody.swift

@@ -46,7 +46,8 @@ extension TypesFileTranslator {
         let contentTypeName = typeName.appending(jsonComponent: "content")
         let contents = requestBody.contents
         for content in contents {
-            if TypeMatcher.isInlinable(content.content.schema) || content.content.isReferenceableMultipart {
+            if typeMatcher.isInlinable(content.content.schema) || typeMatcher.isReferenceableMultipart(content.content)
+            {
                 let inlineTypeDecls = try translateRequestBodyContentInTypes(content)
                 bodyMembers.append(contentsOf: inlineTypeDecls)
             }

Sources/_OpenAPIGeneratorCore/Translator/Responses/translateResponse.swift

@@ -145,7 +145,7 @@ extension TypesFileTranslator {
         let associatedType = typedContent.resolvedTypeUsage
         let content = typedContent.content
         let schema = content.schema
-        if TypeMatcher.isInlinable(schema) || content.isReferenceableMultipart {
+        if typeMatcher.isInlinable(schema) || typeMatcher.isReferenceableMultipart(content) {
             let decls: [Declaration]
             if contentType.isMultipart {
                 decls = try translateMultipartBody(typedContent)

Sources/_OpenAPIGeneratorCore/Translator/Responses/translateResponseHeader.swift

@@ -66,7 +66,7 @@ extension TypesFileTranslator {
         let schema = header.schema
         let typeUsage = header.typeUsage
         let associatedDeclarations: [Declaration]
-        if TypeMatcher.isInlinable(schema) {
+        if typeMatcher.isInlinable(schema) {
             associatedDeclarations = try translateSchema(typeName: typeUsage.typeName, schema: schema, overrides: .none)
         } else {
             associatedDeclarations = []

Sources/_OpenAPIGeneratorCore/Translator/TypeAssignment/TypeAssigner.swift

@@ -122,7 +122,9 @@ struct TypeAssigner {
         inParent parent: TypeName
     ) throws -> TypeUsage {
         let multipartBodyElementTypeName: TypeName
-        if let ref = TypeMatcher.multipartElementTypeReferenceIfReferenceable(schema: schema, encoding: encoding) {
+        if let ref = TypeMatcher(context: context)
+            .multipartElementTypeReferenceIfReferenceable(schema: schema, encoding: encoding)
+        {
             multipartBodyElementTypeName = try typeName(for: ref)
         } else {
             let swiftSafeName = context.asSwiftSafeName(hint)

Sources/_OpenAPIGeneratorCore/Translator/TypeAssignment/TypeMatcher.swift

@@ -42,7 +42,7 @@ struct TypeMatcher {
     func tryMatchBuiltinType(for schema: JSONSchema.Schema) -> TypeUsage? {
         Self._tryMatchRecursive(
             for: schema,
-            test: { schema in Self._tryMatchBuiltinNonRecursive(for: schema) },
+            test: { schema in _tryMatchBuiltinNonRecursive(for: schema) },
             matchedArrayHandler: { elementType, nullableItems in
                 nullableItems ? elementType.asOptional.asArray : elementType.asArray
             },
@@ -68,7 +68,7 @@ struct TypeMatcher {
         try Self._tryMatchRecursive(
             for: schema.value,
             test: { (schema) -> TypeUsage? in
-                if let builtinType = Self._tryMatchBuiltinNonRecursive(for: schema) { return builtinType }
+                if let builtinType = _tryMatchBuiltinNonRecursive(for: schema) { return builtinType }
                 guard case let .reference(ref, _) = schema else { return nil }
                 return try TypeAssigner(context: context).typeName(for: ref).asUsage
             },
@@ -88,9 +88,9 @@ struct TypeMatcher {
     /// - A reference
     /// - Parameter schema: The schema to match a referenceable type for.
     /// - Returns: `true` if the schema is referenceable; `false` otherwise.
-    static func isReferenceable(_ schema: JSONSchema) -> Bool {
+    func isReferenceable(_ schema: JSONSchema) -> Bool {
         // This logic should be kept in sync with `tryMatchReferenceableType`.
-        _tryMatchRecursive(
+        Self._tryMatchRecursive(
             for: schema.value,
             test: { schema in
                 if _tryMatchBuiltinNonRecursive(for: schema) != nil { return true }
@@ -110,7 +110,7 @@ struct TypeMatcher {
     /// - A reference
     /// - Parameter schema: The schema to match a referenceable type for.
     /// - Returns: `true` if the schema is referenceable; `false` otherwise.
-    static func isReferenceable(_ schema: UnresolvedSchema?) -> Bool {
+    func isReferenceable(_ schema: UnresolvedSchema?) -> Bool {
         guard let schema else {
             // fragment type is referenceable
             return true
@@ -132,7 +132,7 @@ struct TypeMatcher {
     /// referenceable.
     /// - Parameter schema: The schema to match a referenceable type for.
     /// - Returns: `true` if the schema is inlinable; `false` otherwise.
-    static func isInlinable(_ schema: JSONSchema) -> Bool { !isReferenceable(schema) }
+    func isInlinable(_ schema: JSONSchema) -> Bool { !isReferenceable(schema) }
 
     /// Returns a Boolean value that indicates whether the schema
     /// needs to be defined inline.
@@ -143,14 +143,14 @@ struct TypeMatcher {
     /// referenceable.
     /// - Parameter schema: The schema to match a referenceable type for.
     /// - Returns: `true` if the schema is inlinable; `false` otherwise.
-    static func isInlinable(_ schema: UnresolvedSchema?) -> Bool { !isReferenceable(schema) }
+    func isInlinable(_ schema: UnresolvedSchema?) -> Bool { !isReferenceable(schema) }
 
     /// Return a reference to a multipart element type if the provided schema is referenceable.
     /// - Parameters:
     ///   - schema: The schema to try to reference.
     ///   - encoding: The associated encoding.
     /// - Returns: A reference if the schema is referenceable, nil otherwise.
-    static func multipartElementTypeReferenceIfReferenceable(
+    func multipartElementTypeReferenceIfReferenceable(
         schema: UnresolvedSchema?,
         encoding: OrderedDictionary<String, OpenAPI.Content.Encoding>?
     ) -> OpenAPI.Reference<JSONSchema>? {
@@ -174,11 +174,9 @@ struct TypeMatcher {
     ///   - components: The reusable components from the OpenAPI document.
     /// - Throws: An error if there's an issue while checking the schema.
     /// - Returns: `true` if the schema is a key-value pair; `false` otherwise.
-    static func isKeyValuePair(
-        _ schema: JSONSchema,
-        referenceStack: inout ReferenceStack,
-        components: OpenAPI.Components
-    ) throws -> Bool {
+    func isKeyValuePair(_ schema: JSONSchema, referenceStack: inout ReferenceStack, components: OpenAPI.Components)
+        throws -> Bool
+    {
         switch schema.value {
         case .object, .fragment: return true
         case .null, .boolean, .number, .integer, .string, .array, .not: return false
@@ -222,7 +220,7 @@ struct TypeMatcher {
     ///   - components: The reusable components from the OpenAPI document.
     /// - Throws: An error if there's an issue while checking the schema.
     /// - Returns: `true` if the schema is a key-value pair; `false` otherwise.
-    static func isKeyValuePair(
+    func isKeyValuePair(
         _ schema: UnresolvedSchema?,
         referenceStack: inout ReferenceStack,
         components: OpenAPI.Components
@@ -285,7 +283,7 @@ struct TypeMatcher {
     /// - Parameter schema: The schema to match a referenceable type for.
     /// - Returns: A type usage for the schema if the schema is built-in.
     /// Otherwise, returns nil.
-    private static func _tryMatchBuiltinNonRecursive(for schema: JSONSchema.Schema) -> TypeUsage? {
+    private func _tryMatchBuiltinNonRecursive(for schema: JSONSchema.Schema) -> TypeUsage? {
         let typeName: TypeName
         switch schema {
         case .boolean(_): typeName = .swift("Bool")