ansible-later/testenv/lib/python2.7/site-packages/anyconfig/parser.py

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2019-04-23 11:04:27 +00:00
#
# Copyright (C) 2011 - 2013 Satoru SATOH <ssato @ redhat.com>
# License: MIT
#
"""Misc parsers
"""
from __future__ import absolute_import
import re
INT_PATTERN = re.compile(r"^(\d|([1-9]\d+))$")
BOOL_PATTERN = re.compile(r"^(true|false)$", re.I)
STR_PATTERN = re.compile(r"^['\"](.*)['\"]$")
def parse_single(str_):
"""
Very simple parser to parse expressions represent some single values.
:param str_: a string to parse
:return: Int | Bool | String
>>> parse_single(None)
''
>>> parse_single("0")
0
>>> parse_single("123")
123
>>> parse_single("True")
True
>>> parse_single("a string")
'a string'
>>> parse_single('"a string"')
'a string'
>>> parse_single("'a string'")
'a string'
>>> parse_single("0.1")
'0.1'
>>> parse_single(" a string contains extra whitespaces ")
'a string contains extra whitespaces'
"""
if str_ is None:
return ''
str_ = str_.strip()
if not str_:
return ''
if BOOL_PATTERN.match(str_) is not None:
return bool(str_)
if INT_PATTERN.match(str_) is not None:
return int(str_)
if STR_PATTERN.match(str_) is not None:
return str_[1:-1]
return str_
def parse_list(str_, sep=","):
"""
Simple parser to parse expressions reprensent some list values.
:param str_: a string to parse
:param sep: Char to separate items of list
:return: [Int | Bool | String]
>>> parse_list("")
[]
>>> parse_list("1")
[1]
>>> parse_list("a,b")
['a', 'b']
>>> parse_list("1,2")
[1, 2]
>>> parse_list("a,b,")
['a', 'b']
"""
return [parse_single(x) for x in str_.split(sep) if x]
def attr_val_itr(str_, avs_sep=":", vs_sep=",", as_sep=";"):
"""
Atrribute and value pair parser.
:param str_: String represents a list of pairs of attribute and value
:param avs_sep: char to separate attribute and values
:param vs_sep: char to separate values
:param as_sep: char to separate attributes
"""
for rel in parse_list(str_, as_sep):
if avs_sep not in rel or rel.endswith(avs_sep):
continue
(_attr, _values) = parse_list(rel, avs_sep)
if vs_sep in str(_values):
_values = parse_list(_values, vs_sep)
if _values:
yield (_attr, _values)
def parse_attrlist_0(str_, avs_sep=":", vs_sep=",", as_sep=";"):
"""
Simple parser to parse expressions in the form of
[ATTR1:VAL0,VAL1,...;ATTR2:VAL0,VAL2,..].
:param str_: input string
:param avs_sep: char to separate attribute and values
:param vs_sep: char to separate values
:param as_sep: char to separate attributes
:return:
a list of tuples of (key, value | [value])
where key = (Int | String | ...),
value = (Int | Bool | String | ...) | [Int | Bool | String | ...]
>>> parse_attrlist_0("a:1")
[('a', 1)]
>>> parse_attrlist_0("a:1;b:xyz")
[('a', 1), ('b', 'xyz')]
>>> parse_attrlist_0("requires:bash,zsh")
[('requires', ['bash', 'zsh'])]
>>> parse_attrlist_0("obsoletes:sysdata;conflicts:sysdata-old")
[('obsoletes', 'sysdata'), ('conflicts', 'sysdata-old')]
"""
return [(a, vs) for a, vs in attr_val_itr(str_, avs_sep, vs_sep, as_sep)]
def parse_attrlist(str_, avs_sep=":", vs_sep=",", as_sep=";"):
"""
Simple parser to parse expressions in the form of
[ATTR1:VAL0,VAL1,...;ATTR2:VAL0,VAL2,..].
:param str_: input string
:param avs_sep: char to separate attribute and values
:param vs_sep: char to separate values
:param as_sep: char to separate attributes
>>> parse_attrlist("requires:bash,zsh")
{'requires': ['bash', 'zsh']}
"""
return dict(parse_attrlist_0(str_, avs_sep, vs_sep, as_sep))
def parse(str_, lsep=",", avsep=":", vssep=",", avssep=";"):
"""Generic parser"""
if avsep in str_:
return parse_attrlist(str_, avsep, vssep, avssep)
if lsep in str_:
return parse_list(str_, lsep)
return parse_single(str_)
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