load/consult a prolog fragment without loading from a file

[Luke Miller]

Hi,

I have a prolog script I am generating in python and I would like to load it into the `Prolog()` singleton for quering. I can write it to a file and then call `Prolog().consult` but I was wondering if there is a way to skip that step and just load the snippet direct?

Thanks,

Luke

[Stuart Reynolds]

For simple rule-bases, you can parse a .pl easily. The following will do it. If you have comments, you'll need to add handling for those also.

def statements(s: str):
    last = ""
    for _s in s.splitlines(keepends=False):
        _s = _s.rstrip()
        if not _s: continue
        if _s.endswith("."):
            last += _s[:-1]
            yield last
            last = ""
        else:
            last += _s
            last += " "
    if last:
        yield last

def consultString(prolog: Prolog, s: str):
    for ass in statements(s):
        print(f"---------\n{ass}")
        prolog.assertz(ass)


q = open("rulesandfacts.pl").read()
prolog = Prolog()
consultString(prolog,q)