"""
Copyright 2019 Simon Vandevelde, Bram Aerts, Joost Vennekens
This code is licensed under GNU GPLv3 license (see LICENSE) for more
information.
This file is part of the cDMN solver.
"""
from typing import List, Dict
import re
[docs]def merge_definitions(idp: str) -> str:
"""
In cDMN, it is possible to create different tables that each define
the same concept.
In cases where relations are defined, this can be problematic.
E.g., in the `Vacation_Days_Advanced_old` example, we define the `Employee
eligible for Rule` relation in 5 different tables, each for a different
value of `Rule`.
In IDP, a definition is expected to be complete: all possible values for
the defined concept should be defined. All other values are implicitly
impossible. Because the cDMN implementation creates 5 different
definitions, each defining a different value, this results in an unsat in
IDP.
The solution to this problem is to merge all tables defining the same
concept.
"""
rules = re.findall(r"\n(.+?)(?=<-)(.+?)(?=\.\n)", idp)
new_idp = re.sub(r"\n(.+?)(?=<-)(.+?)(?=\.\n)", "", idp)
# comments = re.findall(r"\t//(.*?)\n\t{(\.*?)\n(.*?)}", new_idp)
# comments = [x[0] for x in comments]
defined_concepts: Dict[str, str] = {}
# Go over every rule and try to find the head.
for head, body in rules:
rule = head + body + ".\n"
try: # Find all rules with quantifiers.
defined_concept = re.findall(r": (.*?)\(", rule)[0]
except IndexError: # Find all rules without quantifiers.
defined_concept = re.findall(r"\t(.*?)\(", rule)[0]
if defined_concept in defined_concepts:
defined_concepts[defined_concept] += rule
else:
defined_concepts[defined_concept] = rule
new_idp = re.sub(r"\t//(.*?)\n\t{(\.*?)\n(.*?)}", "", new_idp)
for key, val in defined_concepts.items():
new_idp += "\t{\n"
new_idp += val
new_idp += "\t}\n"
return new_idp