Refactored sheerka class: splitted to use sub handlers. Refactored unit tests to use classes.

src/parsers/EmptyStringParser.py

@@ -0,0 +1,28 @@
+from core.builtin_concepts import BuiltinConcepts
+from parsers.BaseParser import BaseParser
+
+
+class EmptyStringParser(BaseParser):
+    """
+    To parse empty or blank strings
+    """
+
+    def __init__(self, **kwargs):
+        BaseParser.__init__(self, "EmptyString", 90)
+
+    def parse(self, context, text):
+        sheerka = context.sheerka
+
+        if isinstance(text, str) and text.strip() == "" or \
+            isinstance(text, list) and text == [] or \
+            text is None:
+            ret = sheerka.ret(self.name, True, sheerka.new(
+                BuiltinConcepts.PARSER_RESULT,
+                parser=self,
+                source="",
+                body=sheerka.new(BuiltinConcepts.NOP)))
+        else:
+            ret = sheerka.ret(self.name, False, sheerka.new(BuiltinConcepts.NOT_FOR_ME))
+
+        self.log_result(context, text, ret)
+        return ret