iopsys-feed/jsonval/src/main.cpp

#include <iostream>
#include <fstream>
#include <string>
#include <nlohmann/json.hpp>
#include <nlohmann/json-schema.hpp>

using nlohmann::json;
using nlohmann::json_schema::json_validator;
using namespace std;

void print_usage(const string& prog_name) {
	cerr << "Usage: " << prog_name << " -s <schema.json> -j <data.json>" << endl;
}

int main(int argc, char* argv[]) {
	string schema_path, data_path;

	// Simple argument parsing
	for (int i = 1; i < argc; ++i) {
		string arg = argv[i];
		if ((arg == "-s" || arg == "--schema") && i + 1 < argc) {
			schema_path = argv[++i];
		} else if ((arg == "-j" || arg == "--json") && i + 1 < argc) {
			data_path = argv[++i];
		} else {
			print_usage(argv[0]);
			return 1;
		}
	}

	if (schema_path.empty() || data_path.empty()) {
		print_usage(argv[0]);
		return 1;
	}

	ifstream schema_file(schema_path);
	ifstream data_file(data_path);

	if (!schema_file.is_open() || !data_file.is_open()) {
		cerr << "Error: Could not open one or both files." << endl;
		return 2;
	}

	json schema, document;
	try {
		schema_file >> schema;
		data_file >> document;
	} catch (const json::parse_error& e) {
		cerr << "Parse error: " << e.what() << endl;
		return 3;
	}

	try {
		json_validator validator;
		validator.set_root_schema(schema);
		validator.validate(document);
		cout << "Valid" << endl;
	} catch (const std::exception& e) {
		cerr << "Validation failed: " << e.what() << endl;
		return 4;
	}

	return 0;
}