from contextlib import contextmanager
from py_sexpr import terms
import warnings

__metadata_to_wrap = terms.metadata


def metadata(line, col, filename, sexpr):
    """https://github.com/purescript-python/purescript-python/issues/8
    """
    if line is 0:
        line = 1
    return __metadata_to_wrap(line, col, filename, sexpr)


# one of following approaches is okay


@contextmanager
def workaround():
    """contextually invoke this when loading *.src.py"""
    __metadata_to_wrap.__globals__["metadata"] = metadata
    try:
        yield
    finally:
        __metadata_to_wrap.__globals__["metadata"] = __metadata_to_wrap


@contextmanager
def suppress_cpy38_literal_is():
    """https://github.com/purescript-python/purescript-python/issues/9"""
    with warnings.catch_warnings():
        warnings.filterwarnings(
            "ignore", category=SyntaxWarning, message='"is" with a literal'
        )
        yield