should be it

external/duckdb/extension/json/include/json_deserializer.hpp

@@ -0,0 +1,82 @@
+#pragma once
+#include "json_common.hpp"
+#include "duckdb/common/serializer/deserializer.hpp"
+
+namespace duckdb {
+
+class JsonDeserializer : public Deserializer {
+public:
+	JsonDeserializer(yyjson_val *val, const yyjson_doc_ptr &doc) : doc(doc.get()) {
+		deserialize_enum_from_string = true;
+		stack.emplace_back(val);
+	}
+
+private:
+	struct StackFrame {
+		yyjson_val *val;
+		yyjson_arr_iter arr_iter;
+		explicit StackFrame(yyjson_val *val) : val(val) {
+			yyjson_arr_iter_init(val, &arr_iter);
+		}
+	};
+
+	yyjson_doc *doc;
+	const char *current_tag = nullptr;
+	vector<StackFrame> stack;
+
+	void DumpDoc();
+	void DumpCurrent();
+	void Dump(yyjson_mut_val *val);
+	void Dump(yyjson_val *val);
+
+	// Get the current json value
+	inline StackFrame &Current() {
+		return stack.back();
+	};
+
+	inline void Push(yyjson_val *val) {
+		stack.emplace_back(val);
+	}
+	inline void Pop() {
+		stack.pop_back();
+	}
+	yyjson_val *GetNextValue();
+
+	void ThrowTypeError(yyjson_val *val, const char *expected);
+
+	//===--------------------------------------------------------------------===//
+	// Nested Types Hooks
+	//===--------------------------------------------------------------------===//
+	void OnPropertyBegin(const field_id_t field_id, const char *tag) final;
+	void OnPropertyEnd() final;
+	bool OnOptionalPropertyBegin(const field_id_t field_id, const char *tag) final;
+	void OnOptionalPropertyEnd(bool present) final;
+
+	void OnObjectBegin() final;
+	void OnObjectEnd() final;
+	idx_t OnListBegin() final;
+	void OnListEnd() final;
+	bool OnNullableBegin() final;
+	void OnNullableEnd() final;
+
+	//===--------------------------------------------------------------------===//
+	// Primitive Types
+	//===--------------------------------------------------------------------===//
+	bool ReadBool() final;
+	int8_t ReadSignedInt8() final;
+	uint8_t ReadUnsignedInt8() final;
+	int16_t ReadSignedInt16() final;
+	uint16_t ReadUnsignedInt16() final;
+	int32_t ReadSignedInt32() final;
+	uint32_t ReadUnsignedInt32() final;
+	int64_t ReadSignedInt64() final;
+	uint64_t ReadUnsignedInt64() final;
+	float ReadFloat() final;
+	double ReadDouble() final;
+	string ReadString() final;
+	hugeint_t ReadHugeInt() final;
+	uhugeint_t ReadUhugeInt() final;
+	void ReadDataPtr(data_ptr_t &ptr, idx_t count) final;
+};
+
+} // namespace duckdb