JobShopProblem now a list, renaming module

contributes to #3

src/Parser/js1_style.py

@@ -0,0 +1,57 @@
+from arpeggio.cleanpeg import ParserPEG
+from typing import List, Tuple, Sequence, Optional, Union
+import arpeggio
+
+from . import grammar, ParseError, JobShopProblem, JobShopVisitor
+
+class JobShop1Visitor(JobShopVisitor):
+    """instanciated for semantic analysis of parse_tree"""
+
+    def visit_problem_instance(self, node: arpeggio.ParseTreeNode, children: arpeggio.SemanticActionResults) -> JobShopProblem:
+        if self.debug:
+            print("problem_instance\nchildren:", children)
+        problem: JobShopProblem = children[3]
+        problem.name = children[0]
+        problem.description = children[2]
+        return problem
+
+    def visit_instance_list(self, node: arpeggio.ParseTreeNode, children: arpeggio.SemanticActionResults) -> List[JobShopProblem]:
+        if self.debug:
+            print("instance_list\nchildren:", children)
+        return list(filter(lambda x: isinstance(x, JobShopProblem), children))
+
+    def visit_skip_preface(self, node: arpeggio.ParseTreeNode, children: arpeggio.SemanticActionResults) -> List[JobShopProblem]:
+        if self.debug:
+            print("skip_preface\nchildren:", children)
+        return list(filter(lambda x: type(x) is list, children))[0]
+
+    # ignore eol nodes
+    def visit_eol(self, node:arpeggio.ParseTreeNode, children: arpeggio.SemanticActionResults) -> None:
+        return None
+    
+    # ignore trim_ws nodes
+    def visit_trim_ws(self, node:arpeggio.ParseTreeNode, children: arpeggio.SemanticActionResults) -> None:
+        return None
+
+def parse_jobshop1_string(inputdata: str) -> JobShopProblem:
+    """parse string with jobshop1-formatted data (multiple problem instances)
+    and return list of JobShopProblem s"""
+    parse_tree = parser.parse(inputdata)
+    return arpeggio.visit_parse_tree(parse_tree, JobShop1Visitor())
+
+def parse_jobshop1_file(filename: Union[str, bytes]) -> List[JobShopProblem]:
+    """Open file with jobshop1-formatted data (multiple problem instances),
+    parse it and return list of JobShopProblem s"""
+
+    with open(filename) as datafile:
+        inputdata: str = datafile.read()
+        return parse_jobshop1_string(inputdata)
+            
+
+def main():
+    print(parse_jobshop1_file("../inputdata/jobshop1.txt"))
+
+parser = ParserPEG(grammar, "job_shop1", skipws=False)
+
+if __name__ == "__main__":
+    main()