Add method to extract filter terms from query to all filters

- Test the get_filter_term method in all 3 word, file, date filters
- Make the existing can_filter method by default in base filter abstract class

tests/test_date_filter.py

@@ -158,3 +158,23 @@ def test_date_filter_regex():
 
     dtrange_match = re.findall(DateFilter().date_regex, "head tail")
     assert dtrange_match == []
+
+
+def test_get_file_filter_terms():
+    dtrange_match = DateFilter().get_filter_terms('multi word head dt>"today" dt:"1984-01-01"')
+    assert dtrange_match == ["dt>'today'", "dt:'1984-01-01'"]
+
+    dtrange_match = DateFilter().get_filter_terms('head dt>"today" dt:"1984-01-01" multi word tail')
+    assert dtrange_match == ["dt>'today'", "dt:'1984-01-01'"]
+
+    dtrange_match = DateFilter().get_filter_terms('multi word head dt>="today" dt="1984-01-01"')
+    assert dtrange_match == ["dt>='today'", "dt='1984-01-01'"]
+
+    dtrange_match = DateFilter().get_filter_terms('dt<"multi word date" multi word tail')
+    assert dtrange_match == ["dt<'multi word date'"]
+
+    dtrange_match = DateFilter().get_filter_terms('head dt<="multi word date"')
+    assert dtrange_match == ["dt<='multi word date'"]
+
+    dtrange_match = DateFilter().get_filter_terms("head tail")
+    assert dtrange_match == []

tests/test_file_filter.py

@@ -99,6 +99,18 @@ def test_multiple_file_filter():
     assert entry_indices == {0, 1, 2, 3}
 
 
+def test_get_file_filter_terms():
+    # Arrange
+    file_filter = FileFilter()
+    q_with_filter_terms = 'head tail file:"file 1.org" file:"/path/to/dir/*.org"'
+
+    # Act
+    filter_terms = file_filter.get_filter_terms(q_with_filter_terms)
+
+    # Assert
+    assert filter_terms == ['file:"file 1.org"', 'file:"/path/to/dir/*.org"']
+
+
 def arrange_content():
     entries = [
         Entry(compiled="", raw="First Entry", file="file 1.org"),

tests/test_word_filter.py

@@ -67,6 +67,18 @@ def test_word_include_and_exclude_filter():
     assert entry_indices == {2}
 
 
+def test_get_word_filter_terms():
+    # Arrange
+    word_filter = WordFilter()
+    query_with_include_and_exclude_filter = 'head +"include_word" -"exclude_word" tail'
+
+    # Act
+    filter_terms = word_filter.get_filter_terms(query_with_include_and_exclude_filter)
+
+    # Assert
+    assert filter_terms == ["+include_word", "-exclude_word"]
+
+
 def arrange_content():
     entries = [
         Entry(compiled="", raw="Minimal Entry"),