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# Copyright (C) 2011 - 2013 Satoru SATOH <ssato @ redhat.com> |
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# License: MIT |
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# |
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"""Misc parsers |
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""" |
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from __future__ import absolute_import |
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import re |
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INT_PATTERN = re.compile(r"^(\d|([1-9]\d+))$") |
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BOOL_PATTERN = re.compile(r"^(true|false)$", re.I) |
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STR_PATTERN = re.compile(r"^['\"](.*)['\"]$") |
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def parse_single(str_): |
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""" |
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Very simple parser to parse expressions represent some single values. |
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:param str_: a string to parse |
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:return: Int | Bool | String |
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>>> parse_single(None) |
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'' |
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>>> parse_single("0") |
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0 |
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>>> parse_single("123") |
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123 |
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>>> parse_single("True") |
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True |
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>>> parse_single("a string") |
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'a string' |
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>>> parse_single('"a string"') |
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'a string' |
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>>> parse_single("'a string'") |
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'a string' |
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>>> parse_single("0.1") |
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'0.1' |
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>>> parse_single(" a string contains extra whitespaces ") |
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'a string contains extra whitespaces' |
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""" |
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if str_ is None: |
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return '' |
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str_ = str_.strip() |
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if not str_: |
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return '' |
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if BOOL_PATTERN.match(str_) is not None: |
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return bool(str_) |
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if INT_PATTERN.match(str_) is not None: |
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return int(str_) |
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if STR_PATTERN.match(str_) is not None: |
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return str_[1:-1] |
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return str_ |
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def parse_list(str_, sep=","): |
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""" |
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Simple parser to parse expressions reprensent some list values. |
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:param str_: a string to parse |
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:param sep: Char to separate items of list |
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:return: [Int | Bool | String] |
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>>> parse_list("") |
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[] |
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>>> parse_list("1") |
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[1] |
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>>> parse_list("a,b") |
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['a', 'b'] |
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>>> parse_list("1,2") |
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[1, 2] |
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>>> parse_list("a,b,") |
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['a', 'b'] |
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""" |
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return [parse_single(x) for x in str_.split(sep) if x] |
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def attr_val_itr(str_, avs_sep=":", vs_sep=",", as_sep=";"): |
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""" |
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Atrribute and value pair parser. |
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:param str_: String represents a list of pairs of attribute and value |
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:param avs_sep: char to separate attribute and values |
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:param vs_sep: char to separate values |
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:param as_sep: char to separate attributes |
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""" |
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for rel in parse_list(str_, as_sep): |
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if avs_sep not in rel or rel.endswith(avs_sep): |
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continue |
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(_attr, _values) = parse_list(rel, avs_sep) |
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if vs_sep in str(_values): |
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_values = parse_list(_values, vs_sep) |
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if _values: |
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yield (_attr, _values) |
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def parse_attrlist_0(str_, avs_sep=":", vs_sep=",", as_sep=";"): |
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""" |
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Simple parser to parse expressions in the form of |
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[ATTR1:VAL0,VAL1,...;ATTR2:VAL0,VAL2,..]. |
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:param str_: input string |
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:param avs_sep: char to separate attribute and values |
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:param vs_sep: char to separate values |
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:param as_sep: char to separate attributes |
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:return: |
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a list of tuples of (key, value | [value]) |
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where key = (Int | String | ...), |
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value = (Int | Bool | String | ...) | [Int | Bool | String | ...] |
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>>> parse_attrlist_0("a:1") |
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[('a', 1)] |
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>>> parse_attrlist_0("a:1;b:xyz") |
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[('a', 1), ('b', 'xyz')] |
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>>> parse_attrlist_0("requires:bash,zsh") |
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[('requires', ['bash', 'zsh'])] |
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>>> parse_attrlist_0("obsoletes:sysdata;conflicts:sysdata-old") |
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[('obsoletes', 'sysdata'), ('conflicts', 'sysdata-old')] |
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""" |
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return [(a, vs) for a, vs in attr_val_itr(str_, avs_sep, vs_sep, as_sep)] |
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def parse_attrlist(str_, avs_sep=":", vs_sep=",", as_sep=";"): |
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""" |
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Simple parser to parse expressions in the form of |
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[ATTR1:VAL0,VAL1,...;ATTR2:VAL0,VAL2,..]. |
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:param str_: input string |
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:param avs_sep: char to separate attribute and values |
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:param vs_sep: char to separate values |
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:param as_sep: char to separate attributes |
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>>> parse_attrlist("requires:bash,zsh") |
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{'requires': ['bash', 'zsh']} |
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""" |
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return dict(parse_attrlist_0(str_, avs_sep, vs_sep, as_sep)) |
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def parse(str_, lsep=",", avsep=":", vssep=",", avssep=";"): |
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"""Generic parser""" |
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if avsep in str_: |
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return parse_attrlist(str_, avsep, vssep, avssep) |
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elif lsep in str_: |
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return parse_list(str_, lsep) |
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return parse_single(str_) |
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# vim:sw=4:ts=4:et: |
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ssato /
python-anyconfig
