Refactor - Create a pylint.message package

There is a lot of Message related class in Utils
this warrant the creation of a new package.

See also review for burst utils.py into a package here:
https://github.com/PyCQA/pylint/pull/2654#issuecomment-470748956

1 files changed, 53 insertions, 0 deletions

diff --git a/pylint/message/message.py b/pylint/message/message.py
new file mode 100644
index 000000000..f4a537600
--- /dev/null
+++ b/pylint/message/message.py
@@ -0,0 +1,53 @@
+# -*- coding: utf-8 -*-
+
+# Licensed under the GPL: https://www.gnu.org/licenses/old-licenses/gpl-2.0.html
+# For details: https://github.com/PyCQA/pylint/blob/master/COPYING
+
+
+import collections
+
+from pylint.message.constants import MSG_TYPES
+
+_MsgBase = collections.namedtuple(
+    "_MsgBase",
+    [
+        "msg_id",
+        "symbol",
+        "msg",
+        "C",
+        "category",
+        "confidence",
+        "abspath",
+        "path",
+        "module",
+        "obj",
+        "line",
+        "column",
+    ],
+)
+
+
+class Message(_MsgBase):
+    """This class represent a message to be issued by the reporters"""
+
+    def __new__(cls, msg_id, symbol, location, msg, confidence):
+        return _MsgBase.__new__(
+            cls,
+            msg_id,
+            symbol,
+            msg,
+            msg_id[0],
+            MSG_TYPES[msg_id[0]],
+            confidence,
+            *location
+        )
+
+    def format(self, template):
+        """Format the message according to the given template.
+
+        The template format is the one of the format method :
+        cf. http://docs.python.org/2/library/string.html#formatstrings
+        """
+        # For some reason, _asdict on derived namedtuples does not work with
+        # Python 3.4. Needs some investigation.
+        return template.format(**dict(zip(self._fields, self)))