Add multiline program support

Signed-off-by: Avinal Kumar <avinal.xlvii@gmail.com>
Co-authored-by: Sarita Singh <saritasingh.0425@gmail.com>

include/xbasic/xbasic_interpreter.hpp

@@ -1,11 +1,12 @@
 #ifndef XBASIC_INTERPRETER_HPP_
 #define XBASIC_INTERPRETER_HPP_
 
+#include <iostream>
+
 #include "basic/basic.hpp"
 #include "nlohmann/json.hpp"
 #include "xeus/xinterpreter.hpp"
 
-
 using xeus::xinterpreter;
 namespace nl = nlohmann;
 
@@ -13,7 +14,8 @@ namespace xbasic {
 
   class xbasic_interpreter : public xinterpreter {
   private:
-    basic code_runner;
+    basic* code_runner = nullptr;
+
   public:
     xbasic_interpreter() = default;
 

src/main.cc

@@ -3,17 +3,21 @@
 #include "xbasic/xbasic_interpreter.hpp"
 #include "xeus/xkernel.hpp"
 #include "xeus/xkernel_configuration.hpp"
+#include "xeus/xserver_zmq.hpp"
+
 int main(int argc, char const *argv[]) {
   // Load configuration file
   std::string file_name = (argc == 1) ? "connection.json" : argv[2];
   xeus::xconfiguration config = xeus::load_configuration(file_name);
 
+  auto context = xeus::make_context<zmq::context_t>();
   // Create interpreter instance
   using interpreter_ptr = std::unique_ptr<xbasic::xbasic_interpreter>;
   interpreter_ptr interpreter = std::make_unique<xbasic::xbasic_interpreter>();
 
   // Create kernel instance and start it
-  xeus::xkernel kernel(config, xeus::get_user_name(), std::move(interpreter));
+  xeus::xkernel kernel(config, xeus::get_user_name(), std::move(context), std::move(interpreter),
+                       xeus::make_xserver_zmq);
   kernel.start();
   return 0;
 }

src/xbasic_interpreter.cpp

@@ -1,3 +1,4 @@
+
 #include "xbasic/xbasic_interpreter.hpp"
 
 std::string basic::output = "";
@@ -5,8 +6,9 @@ std::string basic::output = "";
 namespace xbasic {
 
   nl::json xbasic_interpreter::execute_request_impl(int execution_counter, const std::string &code,
-                                                    bool silent, bool store_history,
+                                                    bool /*silent*/, bool /*store_history*/,
-                                                    nl::json user_expressions, bool allow_stdin) {
+                                                    nl::json /*user_expressions*/,
+                                                    bool /*allow_stdin*/) {
     auto ok = []() {
       nl::json result;
       result["status"] = "ok";
@@ -25,36 +27,63 @@ namespace xbasic {
       return result;
     };
 
+    auto dispose = [&]() {
+      delete code_runner;
+      code_runner = nullptr;
+    };
+
+    auto init_basic = [&]() { code_runner = new basic(); };
+
+    if (!code_runner) {
+      init_basic();
+    }
+
     nl::json pub_data;
+    bool is_complete = false;
     try {
-      if (code_runner.evaluate_line(code)) {
+      std::string line;
-        pub_data["text/plain"] = code_runner.run();
+      std::stringstream to_line(code);
-        code_runner.clear_output();
+      while (std::getline(to_line, line, '\n')) {
+        std::cout << line << "\n";
+        if (line == "CLEAR" || line == "RUN") {
+          is_complete = true;
+          std::cout << "Disposing basic...\n";
+        } else if (!code_runner->evaluate_line(line)) {
+          std::cout << "Throw error\n";
+          throw(code_runner->get_error());
+        }
+      }
+      std::string result = code_runner->run();
+      code_runner->clear_output();
+      if (is_complete) {
+        dispose();
+        result += "\n\n Clearing Scope\n";
+      }
+      pub_data["text/plain"] = result;
       publish_execution_result(execution_counter, std::move(pub_data), nl::json::object());
       return ok();
-      } else {
-        throw(code_runner.get_error());
-      }
     } catch (const std::exception &err) {
+      std::cout << "Check error\n";
       return handle_exception(err.what());
     }
     return ok();
   }
 
-  nl::json xbasic_interpreter::complete_request_impl(const std::string &code, int cursor_pos) {
+  nl::json xbasic_interpreter::complete_request_impl(const std::string & /*code*/,
+                                                     int /*cursor_pos*/) {
     nl::json result;
     result["status"] = "ok";
     return result;
   }
 
-  nl::json xbasic_interpreter::inspect_request_impl(const std::string &code, int cursor_pos,
+  nl::json xbasic_interpreter::inspect_request_impl(const std::string & /*code*/,
-                                                    int detail_level) {
+                                                    int /*cursor_pos*/, int /*detail_level*/) {
     nl::json result;
     result["status"] = "ok";
     return result;
   }
 
-  nl::json xbasic_interpreter::is_complete_request_impl(const std::string &code) {
+  nl::json xbasic_interpreter::is_complete_request_impl(const std::string & /*code*/) {
     nl::json result;
     result["status"] = "complete";
     return result;
@@ -73,7 +102,7 @@ namespace xbasic {
        `VA ,V'    MMooon*   ,M  `MM      `YMMNq.   MM  MM
          XMX      MM    `Y. AbmmmqMA   .     `MM   MM  MM.        
        ,V' VA.    MM    ,9 A'     VML  Mb     dM   MM  `Mb.     .'
-     .AM.   .MA..JMMonal.AMA.   .AMMA.`*Ybmmd*  .JMML.  `*bMond^
+     .AM.   .MA..JMMonald'AMA.   .AMMA.`*Ybmmd*  .JMML.  `*bMond^
                                                                    
       xeus-basic: a Jupyter Kernel for BASIC Language
       xBASIC Version: 0.1.0")V0G0N";