add wrapper around basic interpreter

Signed-off-by: Avinal Kumar <avinal.xlvii@gmail.com>

libs/basic/include/basic.hpp

@@ -0,0 +1,60 @@
+/**
+ * SPDX-License-Identifier: Apache-2.0
+ * SPDX-FileCopyrightText: 2021 Avinal Kumar <avinal.xlvii@gmail.com>
+ *
+ * @file	basic.hpp
+ * @brief	Wrapper around basic
+ */
+
+#ifndef BASIC_BASIC_HPP_
+#define BASIC_BASIC_HPP_
+
+#include <string>
+extern "C" {
+#include "basic/parser.h"
+}
+
+class basic {
+private:
+  std::string last_error = "";
+  static std::string output;
+  static int out(int ch) {
+    output.push_back(ch);
+    return 1;
+  }
+
+  static int in() { return getchar(); }
+
+public:
+  basic();
+  ~basic();
+  bool evaluate_line(const std::string& line);
+  std::string run();
+  std::string get_error();
+};
+
+std::string basic::output = "";
+
+basic::basic() {
+  basic_init(1024 * 8, 2048);
+  basic_register_io(out, in);
+}
+
+basic::~basic() { basic_destroy(); }
+
+bool basic::evaluate_line(const std::string& line) {
+  char* input = const_cast<char*>(line.c_str());
+  basic_eval(input);
+  if (evaluate_last_error()) {
+    last_error.append(evaluate_last_error());
+    clear_last_error();
+    return false;
+  }
+  return true;
+}
+
+std::string basic::get_error() { return last_error; }
+
+std::string basic::run() { return output; }
+
+#endif  // BASIC_BASIC_HPP_