Codec spec definitions

Summary:
Struct definitions for codec spec implemented downstream.
These will be used by the reflect encoder/decoder.

Reviewed By: awalterschulze

Differential Revision: D64444140

fbshipit-source-id: 35a5bc26855186fc1af21e4dc25375c5f8d0e919

thrift/lib/go/thrift/types/spec_types.go

@@ -0,0 +1,98 @@
+/*
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package types
+
+// FieldSpec is a spec for a struct field.
+type FieldSpec struct {
+	ID            int16
+	WireType      Type
+	Name          string
+	ReflectIndex  int
+	IsOptional    bool
+	ValueTypeSpec *TypeSpec
+}
+
+// StructSpec is a spec for a stuct.
+type StructSpec struct {
+	Name           string
+	IsUnion        bool
+	IsException    bool
+	FieldSpecsByID map[int16]*FieldSpec
+}
+
+// CodecPrimitiveType is an enum for all primitive types used by codec.
+type CodecPrimitiveType int32
+
+const (
+	CODEC_PRIMITIVE_TYPE_BOOL CodecPrimitiveType = iota
+	CODEC_PRIMITIVE_TYPE_BYTE
+	CODEC_PRIMITIVE_TYPE_I16
+	CODEC_PRIMITIVE_TYPE_I32
+	CODEC_PRIMITIVE_TYPE_I64
+	CODEC_PRIMITIVE_TYPE_FLOAT
+	CODEC_PRIMITIVE_TYPE_DOUBLE
+	CODEC_PRIMITIVE_TYPE_BINARY
+	CODEC_PRIMITIVE_TYPE_STRING
+	CODEC_PRIMITIVE_TYPE_VOID
+)
+
+// CodecPrimitiveSpec is a spec for a primitive type.
+type CodecPrimitiveSpec struct {
+	PrimitiveType CodecPrimitiveType
+}
+
+// CodecEnumSpec is a spec for an enum type.
+type CodecEnumSpec struct{}
+
+// CodecSetSpec is a spec for a set type.
+type CodecSetSpec struct {
+	ElementWireType Type
+	ElementTypeSpec *TypeSpec
+}
+
+// CodecListSpec is a spec for a list type.
+type CodecListSpec struct {
+	ElementWireType Type
+	ElementTypeSpec *TypeSpec
+}
+
+// CodecMapSpec is a spec for a map type.
+type CodecMapSpec struct {
+	KeyWireType   Type
+	ValueWireType Type
+	KeyTypeSpec   *TypeSpec
+	ValueTypeSpec *TypeSpec
+}
+
+// CodecStructSpec is a spec for a struct type.
+type CodecStructSpec struct{}
+
+// CodecTypedefSpec is a spec for a typedef type.
+type CodecTypedefSpec struct {
+	UnderlyingTypeSpec *TypeSpec
+}
+
+// TypeSpec is a union of all concrete specs.
+type TypeSpec struct {
+	CodecPrimitiveSpec *CodecPrimitiveSpec
+	CodecEnumSpec      *CodecEnumSpec
+	CodecSetSpec       *CodecSetSpec
+	CodecListSpec      *CodecListSpec
+	CodecMapSpec       *CodecMapSpec
+	CodecTypedefSpec   *CodecTypedefSpec
+	CodecStructSpec    *CodecStructSpec
+}