1 files changed, 77 insertions, 0 deletions
diff --git a/yaksh/base_evaluator.py b/yaksh/base_evaluator.py
new file mode 100644
index 0000000..ce1647f
--- /dev/null
+++ b/yaksh/base_evaluator.py
@@ -0,0 +1,77 @@
+#!/usr/bin/env python
+from __future__ import unicode_literals
+import traceback
+import pwd
+import os
+from os.path import join, isfile
+from os.path import isdir, dirname, abspath, join, isfile, exists
+import subprocess
+import stat
+
+
+# Local imports
+from .grader import MY_DIR, TimeoutException
+
+class BaseEvaluator(object):
+    """Base Evaluator class containing generic attributes and callable methods"""
+
+    def __init__(self):
+        pass
+
+    def check_code(self):
+        raise NotImplementedError("check_code method not implemented")
+
+    def compile_code(self):
+        pass
+
+    def _run_command(self, cmd_args, *args, **kw):
+        """Run a command in a subprocess while blocking, the process is killed
+        if it takes more than 2 seconds to run.  Return the Popen object, the
+        stdout and stderr.
+        """
+        try:
+            proc = subprocess.Popen(cmd_args, *args, **kw)
+            stdout, stderr = proc.communicate()
+        except TimeoutException:
+            # Runaway code, so kill it.
+            proc.kill()
+            # Re-raise exception.
+            raise
+        return proc, stdout.decode('utf-8'), stderr.decode('utf-8')
+
+    def _remove_null_substitute_char(self, string):
+        """Returns a string without any null and substitute characters"""
+        stripped = ""
+        for c in string:
+            if ord(c) is not 26 and ord(c) is not 0:
+                stripped = stripped + c
+        return ''.join(stripped)
+
+    def create_submit_code_file(self, file_name):
+        """ Set the file path for code (`answer`)"""
+        submit_path = abspath(file_name)
+        if not exists(submit_path):
+            submit_f = open(submit_path, 'w')
+            submit_f.close()
+
+        return submit_path
+
+    def write_to_submit_code_file(self, file_path, user_answer):
+        """ Write the code (`answer`) to a file"""
+        submit_f = open(file_path, 'w')
+        submit_f.write(user_answer.lstrip())
+        submit_f.close()
+
+    def _set_test_code_file_path(self, ref_path=None, test_case_path=None):
+        if ref_path and not ref_path.startswith('/'):
+            ref_path = join(MY_DIR, ref_path)
+
+        if test_case_path and not test_case_path.startswith('/'):
+            test_case_path = join(MY_DIR, test_case_path)
+
+        return ref_path, test_case_path
+
+    def _set_file_as_executable(self, fname):
+        os.chmod(fname,  stat.S_IRUSR | stat.S_IWUSR | stat.S_IXUSR
+                 | stat.S_IRGRP | stat.S_IWGRP | stat.S_IXGRP
+                 | stat.S_IROTH | stat.S_IWOTH | stat.S_IXOTH)