1 files changed, 24 insertions, 0 deletions
diff --git a/sphinx/util/build_phase.py b/sphinx/util/build_phase.py
new file mode 100644
index 000000000..e5a53551c
--- /dev/null
+++ b/sphinx/util/build_phase.py
@@ -0,0 +1,24 @@
+# -*- coding: utf-8 -*-
+"""
+    sphinx.util.build_phase
+    ~~~~~~~~~~~~~~~~~~~~~~~
+
+    Build phase of Sphinx application.
+
+    :copyright: Copyright 2007-2018 by the Sphinx team, see AUTHORS.
+    :license: BSD, see LICENSE for details.
+"""
+
+try:
+    from enum import IntEnum
+except ImportError:  # py27
+    IntEnum = object  # type: ignore
+
+
+class BuildPhase(IntEnum):
+    """Build phase of Sphinx application."""
+    INITIALIZATION = 1
+    READING = 2
+    CONSISTENCY_CHECK = 3
+    RESOLVING = 3
+    WRITING = 4