moved filter parsing code

5 files changed, 27 insertions, 8 deletions

diff --git a/tagit/parsing/__init__.py b/tagit/parsing/__init__.py
index 0070bf9..86ad54f 100644
--- a/tagit/parsing/__init__.py
+++ b/tagit/parsing/__init__.py
@@ -6,12 +6,12 @@ Author: Matthias Baumgartner, 2022
 """
 # inner-module imports
 from .datefmt import parse_datetime
-from .filter import Filter
+from . import filter
 from .sort import Sort
 
 # exports
 __all__ = (
-    'Filter',
+    'filter',
     'Sort',
     'parse_datetime',
     )
diff --git a/tagit/parsing/filter/__init__.py b/tagit/parsing/filter/__init__.py
new file mode 100644
index 0000000..88b6256
--- /dev/null
+++ b/tagit/parsing/filter/__init__.py
@@ -0,0 +1,17 @@
+"""
+
+Part of the tagit module.
+A copy of the license is provided with the project.
+Author: Matthias Baumgartner, 2022
+"""
+# inner-module imports
+from .from_string import FromString
+#from .to_string import ToString
+
+# exports
+__all__ = (
+    'FromString',
+    #'ToString',
+    )
+
+## EOF ##
diff --git a/tagit/parsing/filter.py b/tagit/parsing/filter/from_string.py
index ea8df51..5a38723 100644
--- a/tagit/parsing/filter.py
+++ b/tagit/parsing/filter/from_string.py
@@ -14,25 +14,23 @@ from datetime import datetime
 from pyparsing import CaselessKeyword, Combine, Group, Optional, Or, Word, delimitedList, nums, oneOf, ParseException, Literal, QuotedString, alphanums, alphas8bit, punc8bit
 
 # tagit imports
+from tagit.parsing.datefmt import parse_datetime
 from tagit.utils import bsfs, errors, ns, ttime
 from tagit.utils.bsfs import ast
 
-# inner-module imports
-from .datefmt import parse_datetime
-
 # constants
 SEARCH_DELIM = '/'
 VALUE_DELIM = ','
 
 # exports
 __all__ = (
-    'Filter',
+    'FromString',
     )
 
 
 ## code ##
 
-class Filter():
+class FromString():
 
     # parsers
     _DATETIME_PREDICATES = None
diff --git a/tagit/utils/errors.py b/tagit/utils/errors.py
index 7a2556e..8b5e21a 100644
--- a/tagit/utils/errors.py
+++ b/tagit/utils/errors.py
@@ -53,4 +53,8 @@ class ParserError(Exception):
     """String parsing failure."""
     pass
 
+class BackendError(Exception):
+    """Generic backend error."""
+    pass
+
 ## EOF ##
diff --git a/tagit/widgets/session.py b/tagit/widgets/session.py
index ca8c595..f45ab35 100644
--- a/tagit/widgets/session.py
+++ b/tagit/widgets/session.py
@@ -40,7 +40,7 @@ class Session(Widget):
         self.storage = storage
         self.log = log
         # derived members
-        self.filter_from_string = parsing.Filter(self.storage.schema)
+        self.filter_from_string = parsing.filter.FromString(self.storage.schema)
         #self.sort_from_string = parsing.Sort(self.storage.schema) # FIXME: mb/port/parsing
 
     def __enter__(self):