add function for parsing inputdata strings

src/JobShopParser/jobshop2_parser.py

@@ -14,14 +14,19 @@ class JobShop2Visitor(JobShopVisitor):
             print("returning a", type(problem))
         return problem
 
+def parse_jobshop2_string(inputdata: str) -> JobShopProblem:
+    """parse string of jobshop2-formatted data (single problem instance, no name & description)
+    and return JobShopProblem"""
+    parse_tree = parser.parse(inputdata)
+    return arpeggio.visit_parse_tree(parse_tree, JobShop2Visitor())
+
 def parse_jobshop2_file(filename: Union[str, bytes]) -> JobShopProblem:
     """Open file with jobshop2-formatted data (single problem instance, no name & description),
     parse it and return JobShopProblem"""
 
     with open(filename) as datafile:
         inputdata: str = datafile.read()
-        parse_tree = parser.parse(inputdata)
-        return arpeggio.visit_parse_tree(parse_tree, JobShop2Visitor())
+        return parse_jobshop2_string(inputdata)
 
 def main():
     print(type(parse_jobshop2_file('../inputdata/jobshop2/ta13')))