mv to open source repo

README.md

@@ -1 +1,52 @@
-# .github
+# Prutal
+
+Prutal is a pure Go alternative to [protocol buffers](https://protobuf.dev), it covers most of the functionality offered by Protocol Buffers.
+
+Prutal aims to minimize code generation as much as possible while ensuring serialization and maintaining good performance.
+
+**Since Prutal is NOT yet ready for production use, we are not providing usage documentation at this time, nor do we guarantee backward compatibility of the interface.**
+
+| Features | Protobuf | Prutal |
+| -- | -- | -- |
+| Supported Languages |  C++, Java, Python, Go, and more | Go |
+| Code Generation | ✅ | ✅ |
+| Serialization | ✅ | ✅ without generating code |
+| Performance | ⭐️⭐️⭐️ | ⭐️⭐️⭐️⭐️⭐️ |
+| Extensibility | 😡 Plugin | 😄 Package
+| Compatibility | ✅ | ✅  (see Protobuf Compatibility)
+| gRPC | ✅ | 🚧 Coming soon
+| Non-Pointer Field | ❌ | ✅  (aka gogoproto.nullable)
+
+
+## Protobuf Compatibility
+
+* ✅ Works with code generated by the official Protocol Buffer Go
+* ✅ Parsing .proto file. syntax: proto2, proto3, edition 2023
+* ✅ Protobuf wire format
+    - double, float, bool, string, bytes
+    - int32, int64, uint32, uint64, sint32, sint64
+    - fixed32, fixed64, sfixed64, sfixed64
+    - enum
+    - repeated, map, oneof
+* ✅ Packed / unpack (proto2)
+    - PACKED / EXPANDED (repeated field encoding, edition2023)
+* ✅ Reserved
+* ✅ Unknown Fields
+* ⚠️  JSON support: JSON struct tag only
+* ⚠️  Code generation: Go only
+* ⚠️  Protocol buffers well-known types [link](https://protobuf.dev/reference/protobuf/google.protobuf/)
+    - Prutal is able to generate code by reusing pkg [`google.golang.org/protobuf/type`](https://pkg.go.dev/google.golang.org/protobuf/types/known)
+    - Features of type like `Any` would be limited.
+* ❌ Groups (proto2) [link](https://protobuf.dev/programming-guides/proto2/#groups)
+* ❌ Overriding default scalar values (proto2, edition2023) [link](https://protobuf.dev/programming-guides/proto2/#explicit-default)
+
+
+
+## Contributing
+
+Contributor guide: [Contributing](CONTRIBUTING.md).
+
+## License
+
+Prutal is licensed under the terms of the Apache license 2.0. See [LICENSE](LICENSE) for more information.
+Dependencies used by `prutal` are listed under [licenses](licenses).

go.mod

@@ -0,0 +1,3 @@
+module github.com/cloudwego/prutal
+
+go 1.18

internal/desc/const.go

@@ -0,0 +1,54 @@
+/*
+ * Copyright 2025 CloudWeGo Authors
+ *
+ * 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 desc
+
+import (
+	"strconv"
+)
+
+// FieldType represents types used in struct tag
+type TagType uint8
+
+const (
+	TypeVarint TagType = iota + 1
+	TypeZigZag32
+	TypeZigZag64
+	TypeFixed32
+	TypeFixed64
+	TypeBytes
+	TypeUnknown
+)
+
+var typeNames = []string{
+	TypeVarint:   "varint",
+	TypeZigZag32: "zigzag32",
+	TypeZigZag64: "zigzag64",
+	TypeFixed32:  "fixed32",
+	TypeFixed64:  "fixed64",
+	TypeBytes:    "bytes",
+}
+
+func (t TagType) String() string {
+	ret := ""
+	if uint(t) < uint(len(typeNames)) {
+		ret = typeNames[uint(t)]
+	}
+	if ret == "" {
+		ret = "FieldType-" + strconv.Itoa(int(t))
+	}
+	return ret
+}