def open_existing(self, file_name):
"""Open an existing `.a2ldb` database.
Parameters
----------
file_name: str
Name of your database file, resulting from :meth:`import_a2l`.
Extension `.a2ldb` not needed.
Returns
-------
SQLAlchemy session object.
Raises
------
OSError
If database already exists.
"""
self.in_memory = False
self._set_path_components(file_name)
if not path.exists(self._dbfn):
raise OSError("file '{}' does not exists.".format(self._dbfn))
else:
self.db = model.A2LDatabase(self._dbfn)
self.session = self.db.session
res = self.session.query(model.MetaData).first()
if res:
return self.session
else:
raise InvalidA2LDatabase(
"Database seems to be corrupted. No meta-data found.")
def parse(self, input, trace=False):
if self.useDatabase:
self.db = model.A2LDatabase(self.fnbase, debug=self.debug)
lexer = self.lexerClass(input)
lexer.removeErrorListeners()
lexer.addErrorListener(MyErrorListener())
tokenStream = antlr4.CommonTokenStream(lexer)
# tokenStream = BufferedTokenStream(lexer)
parser = self.parserClass(tokenStream)
parser.setTrace(trace)
parser.removeErrorListeners()
parser.addErrorListener(MyErrorListener())
meth = getattr(parser, self.startSymbol)
self._syntaxErrors = parser._syntaxErrors
tree = meth()
if self.listener:
if self.useDatabase:
self.listener.db = self.db
listener = self.listener()
walker = antlr4.ParseTreeWalker()
result = walker.walk(listener, tree)
if self.useDatabase:
self.db.session.commit()
return self.db
else:
return listener
def open_existing(self, file_name):
"""
"""
self._set_path_components(file_name)
if not path.exists(self._dbfn):
return None
else:
self.db = model.A2LDatabase(self._dbfn)
self.session = self.db.session
res = self.session.query(model.MetaData).first()
if res:
return self.session
else:
return None