filter early port, parsing adaptions

4 files changed, 52 insertions, 1 deletions

diff --git a/tagit/utils/__init__.py b/tagit/utils/__init__.py
index 3f09078..16dcd4d 100644
--- a/tagit/utils/__init__.py
+++ b/tagit/utils/__init__.py
@@ -9,6 +9,7 @@ import typing
 
 # inner-module imports
 from . import bsfs
+from . import namespaces as ns
 from . import time as ttime
 from .frame import Frame
 from .shared import * # FIXME: port properly
diff --git a/tagit/utils/bsfs.py b/tagit/utils/bsfs.py
index 0ab90a9..d80efe0 100644
--- a/tagit/utils/bsfs.py
+++ b/tagit/utils/bsfs.py
@@ -8,8 +8,16 @@ Author: Matthias Baumgartner, 2022
 import typing
 
 # bsfs imports
+from bsfs import schema, Open
+from bsfs.query import ast
+from bsfs.namespace import Namespace
 
 # exports
-__all__: typing.Sequence[str] = []
+__all__: typing.Sequence[str] = (
+    'Namespace',
+    'Open',
+    'ast',
+    'schema',
+    )
 
 ## EOF ##
diff --git a/tagit/utils/namespaces.py b/tagit/utils/namespaces.py
new file mode 100644
index 0000000..dd26eef
--- /dev/null
+++ b/tagit/utils/namespaces.py
@@ -0,0 +1,30 @@
+"""Default namespaces used throughout tagit.
+
+Part of the tagit module.
+A copy of the license is provided with the project.
+Author: Matthias Baumgartner, 2022
+"""
+# standard imports
+import typing
+
+# inner-module imports
+from . import bsfs as _bsfs
+
+# constants
+bse = _bsfs.Namespace('http://bsfs.ai/schema/Entity')
+bsfs = _bsfs.Namespace('http://bsfs.ai/schema', fsep='/')
+bsm = _bsfs.Namespace('http://bsfs.ai/schema/Meta')
+bst = _bsfs.Namespace('http://bsfs.ai/schema/Tag')
+xsd = _bsfs.Namespace('http://www.w3.org/2001/XMLSchema')
+
+# export
+__all__: typing.Sequence[str] = (
+    'bse',
+    'bsfs',
+    'bsm',
+    'xsd',
+    )
+
+## EOF ##
+
+
diff --git a/tagit/utils/shared.py b/tagit/utils/shared.py
index 0d496ed..b5ab421 100644
--- a/tagit/utils/shared.py
+++ b/tagit/utils/shared.py
@@ -28,6 +28,7 @@ __all__: typing.Sequence[str] = (
     'is_list',
     'magnitude_fmt',
     'truncate_dir',
+    'get_root',
     )
 
 
@@ -140,4 +141,15 @@ def fileopen(pth):
     except KeyError:
         warnings.warn('Unknown platform {}'.format(platform.system()))
 
+
+def get_root(obj):
+    """Traverse the widget tree upwards until the root is found."""
+    while obj.parent is not None and obj.parent != obj.parent.parent:
+        if hasattr(obj, 'root') and obj.root is not None:
+            return obj.root
+
+        obj = obj.parent
+
+    return obj
+
 ## EOF ##