#!/usr/bin/env python
# ###########################################################################
#
# This file is part of Taurus
#
# http://taurus-scada.org
#
# Copyright 2011 CELLS / ALBA Synchrotron, Bellaterra, Spain
#
# Taurus is free software: you can redistribute it and/or modify
# it under the terms of the GNU Lesser General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# Taurus is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with Taurus. If not, see <http://www.gnu.org/licenses/>.
#
# ###########################################################################
from ast import literal_eval
__all__ = ["parse_args"]
[docs]def parse_args(s, strip_pars=False):
"""
Parse a string representing arguments to a method to return the
corresponding args and kwargs.
:param s: string representing arguments to a method
:param strip_pars: If True, expect s to include surrounding parenthesis
:type strip_pars: bool
:return: args, kwargs (a list of positional arguments and a dict of keyword
arguments)
"""
s = s.strip()
if strip_pars:
# remove parentheses
if s.startswith("(") and s.endswith(")"):
s = s[1:-1].strip()
if not s:
# empty arg list
return [], {}
a = []
kw = {}
for e in s.split(","):
if "=" in e:
k, v = e.split("=")
kw[k.strip()] = literal_eval(v.strip())
else:
if kw:
# a non-kwarg found after we already have at least one kwarg
raise SyntaxError("non-keyword arg after keyword arg")
a.append(literal_eval(e.strip()))
return a, kw
if __name__ == "__main__":
print(parse_args("1, 2, b=3, c=4"))
print(parse_args(" (1, 2, b=3, c=4 )", strip_pars=True))
print(
parse_args("1, 2, b=3, c=4, 5")
) # <--this should raise a SyntaxError