Reorganize

Test-only code to tests
Rename interface to CommitRequestParser

tests/nlohmann_reference_parser.hpp

@@ -0,0 +1,43 @@
+#pragma once
+
+#include "commit_request.hpp"
+#include <nlohmann/json.hpp>
+#include <string>
+#include <vector>
+
+/**
+ * @brief Reference implementation of CommitRequest parser using nlohmann/json.
+ *
+ * This parser serves as a reference implementation for testing and validation.
+ * It implements the same parsing logic as JsonCommitRequestParser but uses
+ * the well-tested nlohmann/json library for simplicity and correctness.
+ */
+class NlohmannReferenceParser {
+public:
+  enum class ParseResult { Success, ParseError, ValidationError };
+
+  /**
+   * @brief Parse a JSON string into a CommitRequest.
+   * @param request The request object to populate
+   * @param json_str The JSON string to parse
+   * @return ParseResult indicating success or failure type
+   */
+  ParseResult parse(CommitRequest &request, const std::string &json_str);
+
+  /**
+   * @brief Get the last error message if parsing failed.
+   * @return Error message string, empty if no error
+   */
+  const std::string &get_error() const { return error_message_; }
+
+private:
+  std::string error_message_;
+
+  bool parse_preconditions(CommitRequest &request,
+                           const nlohmann::json &preconditions_array);
+  bool parse_operations(CommitRequest &request,
+                        const nlohmann::json &operations_array);
+  std::string decode_base64(const std::string &base64_str);
+  Precondition::Type parse_precondition_type(const std::string &type_str);
+  Operation::Type parse_operation_type(const std::string &type_str);
+};