async def _update_version(
self, wdg: urwid.Text, fetcher: Coroutine[None, None,
Optional[str]]) -> None:
ver = await fetcher
if ver is not None:
wdg.set_text(("success message", ver))
else:
wdg.set_text("N/A")
def _parse(grammar: str, parse_input: str, output_obj: urwid.Text,
chosen_parser: str) -> None:
"""Update the UI with the given grammar and input."""
try:
# Create a parser with `chosen_parser`
parser = lark.Lark(grammar, parser=chosen_parser, lexer="auto")
# Generate a tree
tree = parser.parse(parse_input)
# Parsing errors
except (lark.exceptions.GrammarError, TypeError) as e:
output_obj.set_text(("error", f"Incomplete grammar!\n{str(e)}"))
except lark.exceptions.ParseError as e:
output_obj.set_text(("error", str(e)))
except lark.exceptions.UnexpectedInput as e:
output_obj.set_text(("error", str(e.get_context(parse_input))))
# Importing errors
except FileNotFoundError: # The relative imported file was not found
output_obj.set_text(
("error", "File not found, did you spell it correctly?"))
except KeyError as e:
_ = e.args[0] # The token
# pylint: disable=E1101
output_obj.set_text(
("error", f"Could not import {_.type.lower()} '{_.value}'"))
except lark.exceptions.LarkError as e: # Everything else
output_obj.set_text(("error", repr(e)))
else: # Parsing succeeded
output_obj.set_text(("success", str(tree.pretty())))