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"""
Utility functions and objects to ease Python 2/3 compatibility,
and different versions of support libraries.
"""
import re
import codecs
import warnings
import typing as t
if t.TYPE_CHECKING:
import xml.etree.ElementTree as etree
else:
try:
from lxml import etree
except ImportError:
import xml.etree.ElementTree as etree
try:
etree_register_namespace = etree.register_namespace
except AttributeError:
import xml.etree.ElementTree as etreenative
def etree_register_namespace(prefix, uri):
etreenative._namespace_map[uri] = prefix
def cast_bytes(s, enc="utf-8"):
if isinstance(s, str):
return s.encode(enc)
return s
def ascii(stream):
return codecs.getreader("ascii")(stream)
def bopen(*args, **kwargs):
return open(*args, mode="rb", **kwargs)
long_type = int
def sign(n):
if n < 0:
return -1
if n > 0:
return 1
return 0
r_unicodeEscape = re.compile(r"(\\u[0-9A-Fa-f]{4}|\\U[0-9A-Fa-f]{8})")
def _unicodeExpand(s):
return r_unicodeEscape.sub(lambda m: chr(int(m.group(0)[2:], 16)), s)
narrow_build = False
try:
chr(0x10FFFF)
except ValueError:
narrow_build = True
if narrow_build:
def _unicodeExpand(s):
try:
return r_unicodeEscape.sub(lambda m: chr(int(m.group(0)[2:], 16)), s)
except ValueError:
warnings.warn(
"Encountered a unicode char > 0xFFFF in a narrow python build. "
"Trying to degrade gracefully, but this can cause problems "
"later when working with the string:\n%s" % s
)
return r_unicodeEscape.sub(
lambda m: codecs.decode(m.group(0), "unicode_escape"), s
)
def decodeStringEscape(s):
r"""
s is byte-string - replace \ escapes in string
"""
s = s.replace("\\t", "\t")
s = s.replace("\\n", "\n")
s = s.replace("\\r", "\r")
s = s.replace("\\b", "\b")
s = s.replace("\\f", "\f")
s = s.replace('\\"', '"')
s = s.replace("\\'", "'")
s = s.replace("\\\\", "\\")
return s
# return _unicodeExpand(s) # hmm - string escape doesn't do unicode escaping
def decodeUnicodeEscape(s):
"""
s is a unicode string
replace ``\\n`` and ``\\u00AC`` unicode escapes
"""
if "\\" not in s:
# Most of times, there are no backslashes in strings.
# In the general case, it could use maketrans and translate.
return s
s = s.replace("\\t", "\t")
s = s.replace("\\n", "\n")
s = s.replace("\\r", "\r")
s = s.replace("\\b", "\b")
s = s.replace("\\f", "\f")
s = s.replace('\\"', '"')
s = s.replace("\\'", "'")
s = s.replace("\\\\", "\\")
s = _unicodeExpand(s) # hmm - string escape doesn't do unicode escaping
return s
# Migration to abc in Python 3.8
try:
from collections.abc import Mapping, MutableMapping
except:
from collections import Mapping, MutableMapping
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