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from strictyaml.ruamel.comments import CommentedSeq, CommentedMap
from strictyaml import exceptions
from re import compile
import decimal
import sys
if sys.version_info[:2] > (3, 4):
from collections.abc import Iterable
else:
from collections import Iterable
if sys.version_info[0] == 3:
unicode = str
def flatten(items):
"""
Yield items from any nested iterable.
>>> list(flatten([[1, 2, 3], [[4, 5], 6, 7]]))
[1, 2, 3, 4, 5, 6, 7]
"""
for x in items:
if isinstance(x, Iterable) and not isinstance(x, (str, bytes)):
for sub_x in flatten(x):
yield sub_x
else:
yield x
def has_number_type(value):
"""
Is a value a number or a non-number?
>>> has_number_type(3.5)
True
>>> has_number_type(3)
True
>>> has_number_type(decimal.Decimal("3.5"))
True
>>> has_number_type("3.5")
False
>>> has_number_type(True)
False
"""
return isinstance(value, (int, float, decimal.Decimal)) and not isinstance(
value, bool
)
def is_string(value):
"""
Python 2/3 compatible way of checking if a value is a string.
"""
return isinstance(value, unicode) or str(type(value)) in (
"<type 'unicode'>",
"<type 'str'>",
"<class 'str'>",
)
def is_integer(value):
"""
Is a string a string of an integer?
>>> is_integer("4")
True
>>> is_integer("4_000")
True
>>> is_integer("3.4")
False
"""
return compile(r"^[-+]?[0-9_]+$").match(value) is not None
def is_hexadecimal(value):
"""
Is a string a string of a hexademcial integer?
>>> is_hexadecimal("0xa1")
True
>>> is_hexadecimal("0XA1")
True
>>> is_hexadecimal("0xa1x")
False
>>> is_hexadecimal("xa1")
False
>>> is_hexadecimal("a1")
False
>>> is_hexadecimal("1")
False
"""
return compile(r"^0[xX]+[a-fA-F0-9]+$").match(value) is not None
def is_decimal(value):
"""
Is a string a decimal?
>>> is_decimal("4")
True
>>> is_decimal("4_000")
True
>>> is_decimal("3.5")
True
>>> is_decimal("4.")
True
>>> is_decimal("4.000_001")
True
>>> is_decimal("blah")
False
"""
return (
compile(r"^[-+]?[0-9_]*(\.[0-9_]*)?([eE][-+]?[0-9_]+)?$").match(value)
is not None
)
def is_infinity(value):
"""
Is string a valid representation for positive or negative infinity?
Valid formats are:
[+/-]inf, [+/-]INF, [+/-]Inf, [+/-].inf, [+/-].INF and [+/-].Inf
>>> is_infinity(".inf")
True
>>> is_infinity("+.INF")
True
>>> is_infinity("-.Inf")
True
>>> is_infinity("Inf")
True
>>> is_infinity("INF")
True
>>> is_infinity("-INF")
True
>>> is_infinity("infinitesimal")
False
"""
return compile(r"^[-+]?\.?(?:inf|Inf|INF)$").match(value) is not None
def is_not_a_number(value):
"""
Is string a valid representation for 'not a number'?
Valid formats are: nan, NaN, NAN, .nan, .NaN, .NAN.
>>> is_not_a_number(".nan")
True
>>> is_not_a_number(".NaN")
True
>>> is_not_a_number("NAN")
True
>>> is_not_a_number("nan")
True
>>> is_not_a_number("nanan")
False
>>> is_not_a_number("1e5")
False
"""
return compile(r"^\.?(?:nan|NaN|NAN)$").match(value) is not None
def comma_separated_positions(text):
"""
Start and end positions of comma separated text items.
Commas and trailing spaces should not be included.
>>> comma_separated_positions("ABC, 2,3")
[(0, 3), (5, 6), (7, 8)]
"""
chunks = []
start = 0
end = 0
for item in text.split(","):
space_increment = 1 if item[0] == " " else 0
start += space_increment # Is there a space after the comma to ignore? ", "
end += len(item.lstrip()) + space_increment
chunks.append((start, end))
start += len(item.lstrip()) + 1 # Plus comma
end = start
return chunks
def ruamel_structure(data, validator=None):
"""
Take dicts and lists and return a strictyaml.ruamel style
structure of CommentedMaps, CommentedSeqs and
data.
If a validator is presented and the type is unknown,
it is checked against the validator to see if it will
turn it back in to YAML.
"""
if isinstance(data, dict):
if len(data) == 0:
raise exceptions.CannotBuildDocumentsFromEmptyDictOrList(
"Document must be built with non-empty dicts and lists"
)
return CommentedMap(
[
(ruamel_structure(key), ruamel_structure(value))
for key, value in data.items()
]
)
elif isinstance(data, list):
if len(data) == 0:
raise exceptions.CannotBuildDocumentsFromEmptyDictOrList(
"Document must be built with non-empty dicts and lists"
)
return CommentedSeq([ruamel_structure(item) for item in data])
elif isinstance(data, bool):
return "yes" if data else "no"
elif isinstance(data, (int, float)):
return str(data)
else:
if not is_string(data):
raise exceptions.CannotBuildDocumentFromInvalidData(
(
"Document must be built from a combination of:\n"
"string, int, float, bool or nonempty list/dict\n\n"
"Instead, found variable with type '{}': '{}'"
).format(type(data).__name__, data)
)
return data
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