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# Copyright (C) 2011 - 2015 Satoru SATOH <ssato @ redhat.com> |
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# License: MIT |
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# |
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# pylint: disable=unused-argument |
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"""INI or INI like config files backend. |
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.. versionchanged:: 0.3 |
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Introduce 'ac_parse_value' keyword option to switch behaviors, same as |
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original configparser and rich backend parsing each parameter values. |
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- Format to support: INI or INI like ones |
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- Requirements: It should be available always. |
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- ConfigParser in python 2 standard library: |
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https://docs.python.org/2.7/library/configparser.html |
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- configparser in python 3 standard library: |
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https://docs.python.org/3/library/configparser.html |
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- Limitations: None obvious |
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- Special options: |
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- Use 'ac_parse_value' boolean keyword option if you want to parse values by |
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custom parser, anyconfig.backend.ini._parse. |
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""" |
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from __future__ import absolute_import |
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import anyconfig.backend.base |
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import anyconfig.parser as P |
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import anyconfig.utils |
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from anyconfig.compat import configparser, iteritems |
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from anyconfig.backend.base import mk_opt_args |
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_SEP = ',' |
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def _noop(val, *args, **kwargs): |
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""" |
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Parser does nothing. |
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""" |
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# It means nothing but can suppress 'Unused argument' pylint warns. |
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# (val, args, kwargs)[0] |
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return val |
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def _parse(val_s, sep=_SEP): |
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""" |
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FIXME: May be too naive implementation. |
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:param val_s: A string represents some value to parse |
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:param sep: separator between values |
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>>> _parse(r'"foo string"') |
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'foo string' |
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>>> _parse("a, b, c") |
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['a', 'b', 'c'] |
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>>> _parse("aaa") |
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'aaa' |
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""" |
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if (val_s.startswith('"') and val_s.endswith('"')) or \ |
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(val_s.startswith("'") and val_s.endswith("'")): |
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return val_s[1:-1] |
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elif sep in val_s: |
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return [P.parse(x) for x in P.parse_list(val_s)] |
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else: |
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return P.parse(val_s) |
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def _to_s(val, sep=", "): |
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"""Convert any to string. |
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:param val: An object |
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:param sep: separator between values |
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>>> _to_s([1, 2, 3]) |
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'1, 2, 3' |
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>>> _to_s("aaa") |
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'aaa' |
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""" |
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if anyconfig.utils.is_iterable(val): |
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return sep.join(str(x) for x in val) |
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else: |
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return str(val) |
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def _load(stream, to_container=dict, sep=_SEP, **kwargs): |
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""" |
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:param stream: File or file-like object provides ini-style conf |
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:param to_container: any callable to make container |
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:param sep: Seprator string |
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:return: Dict or dict-like object represents config values |
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""" |
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_parse_val = _parse if kwargs.get("ac_parse_value", False) else _noop |
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# Optional arguements for configparser.SafeConfigParser{,readfp} |
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kwargs_0 = mk_opt_args(("defaults", "dict_type", "allow_no_value"), kwargs) |
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kwargs_1 = mk_opt_args(("filename", ), kwargs) |
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try: |
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parser = configparser.SafeConfigParser(**kwargs_0) |
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except TypeError: |
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# .. note:: |
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# It seems ConfigPaser.*ConfigParser in python 2.6 does not support |
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# 'allow_no_value' option parameter, and TypeError will be thrown. |
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kwargs_0 = mk_opt_args(("defaults", "dict_type"), kwargs) |
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parser = configparser.SafeConfigParser(**kwargs_0) |
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cnf = to_container() |
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parser.readfp(stream, **kwargs_1) |
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# .. note:: Process DEFAULT config parameters as special ones. |
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defaults = parser.defaults() |
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if defaults: |
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cnf["DEFAULT"] = to_container() |
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for key, val in iteritems(defaults): |
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cnf["DEFAULT"][key] = _parse_val(val, sep) |
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for sect in parser.sections(): |
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cnf[sect] = to_container() |
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for key, val in parser.items(sect): |
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cnf[sect][key] = _parse_val(val, sep) |
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return cnf |
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def _dumps_itr(cnf): |
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""" |
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:param cnf: Configuration data to dump |
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""" |
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dkey = "DEFAULT" |
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for sect, params in iteritems(cnf): |
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yield "[%s]" % sect |
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for key, val in iteritems(params): |
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if sect != dkey and dkey in cnf and cnf[dkey].get(key) == val: |
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continue # It should be in [DEFAULT] section. |
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yield "%s = %s" % (key, _to_s(val)) |
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yield '' # it will be a separator between each sections. |
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def _dumps(cnf, **kwargs): |
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""" |
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:param cnf: Configuration data to dump |
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:param kwargs: optional keyword parameters to be sanitized :: dict |
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:return: String representation of `cnf` object in INI format |
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""" |
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return '\n'.join(l for l in _dumps_itr(cnf)) |
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class Parser(anyconfig.backend.base.FromStreamLoader, |
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anyconfig.backend.base.ToStringDumper): |
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""" |
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Ini config files parser. |
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""" |
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_type = "ini" |
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_extensions = ["ini"] |
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_load_opts = ["defaults", "dict_type", "allow_no_value", "filename", |
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"ac_parse_value"] |
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dump_to_string = anyconfig.backend.base.to_method(_dumps) |
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def load_from_stream(self, stream, to_container, **options): |
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""" |
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Load config from given file like object `stream`. |
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:param stream: Config file or file like object |
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:param to_container: callble to make a container object |
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:param options: optional keyword arguments |
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:return: Dict-like object holding config parameters |
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""" |
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return _load(stream, to_container=to_container, **options) |
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# vim:sw=4:ts=4:et: |
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ssato /
python-anyconfig
