Support REPL for Linux

JerryScript-DCO-1.0-Signed-off-by: Hanjoung Lee hanjoung.lee@samsung.com

main-unix.cpp

@@ -219,6 +219,8 @@ main (int argc,
   bool is_dump_snapshot_mode_for_global_or_eval = false;
   const char *dump_snapshot_file_name_p = NULL;
 
+  bool is_repl_mode = false;
+
 #ifdef JERRY_ENABLE_LOG
   const char *log_file_name = NULL;
 #endif /* JERRY_ENABLE_LOG */
@@ -341,10 +343,9 @@ main (int argc,
   if (files_counter == 0
       && exec_snapshots_count == 0)
   {
-    return JERRY_STANDALONE_EXIT_CODE_OK;
+    is_repl_mode = true;
   }
-  else
-  {
+
 #ifdef JERRY_ENABLE_LOG
   if (log_file_name)
   {
@@ -462,6 +463,77 @@ main (int argc,
     }
   }
 
+  if (is_repl_mode)
+  {
+    const char *prompt = "jerry> ";
+    bool is_done = false;
+
+    jerry_api_object_t *global_obj_p = jerry_api_get_global ();
+    jerry_api_value_t print_function;
+
+    if (!jerry_api_get_object_field_value (global_obj_p, (jerry_api_char_t *) "print", &print_function))
+    {
+      return JERRY_STANDALONE_EXIT_CODE_FAIL;
+    }
+
+    if (!jerry_api_is_function (print_function.v_object))
+    {
+      return JERRY_STANDALONE_EXIT_CODE_FAIL;
+    }
+
+    while (!is_done)
+    {
+      uint8_t *source_buffer_tail = buffer;
+      size_t len = 0;
+
+      printf ("%s", prompt);
+
+      // input a line
+      while (true)
+      {
+        if (fread (source_buffer_tail, 1, 1, stdin) != 1 && len == 0)
+        {
+          is_done = true;
+          break;
+        }
+        if (*source_buffer_tail == '\n')
+        {
+          break;
+        }
+        source_buffer_tail ++;
+        len ++;
+      }
+      *source_buffer_tail = 0;
+
+      if (len > 0)
+      {
+        // evaluate the line
+        jerry_api_value_t ret_val;
+        ret_code = jerry_api_eval (buffer, len, false, false, &ret_val);
+
+        if (ret_code == JERRY_COMPLETION_CODE_OK)
+        {
+          // print return value
+          const jerry_api_value_t args[] = {ret_val};
+          jerry_api_value_t ret_val_print;
+          if (jerry_api_call_function (print_function.v_object, NULL, &ret_val_print, args, 1))
+          {
+            jerry_api_release_value (&ret_val_print);
+          }
+        }
+        else
+        {
+          printf ("JERRY_COMPLETION_CODE_UNHANDLED_EXCEPTION\n");
+        }
+
+        jerry_api_release_value (&ret_val);
+      }
+    }
+
+    jerry_api_release_object (global_obj_p);
+    jerry_api_release_value (&print_function);
+  }
+
   jerry_cleanup ();
 
 #ifdef JERRY_ENABLE_LOG
@@ -480,5 +552,4 @@ main (int argc,
   {
     return JERRY_STANDALONE_EXIT_CODE_FAIL;
   }
-  }
 } /* main */