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common_imports.py
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common_imports.py
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"""
Common helpers and adaptations for Py2/3.
To be used in tests.
"""
# Slows down test runs by factors. Enable to debug proxy handling issues.
DEBUG_PROXY_ISSUES = False # True
import gc
import os
import os.path
import re
import sys
import tempfile
import unittest
from contextlib import contextmanager
from io import StringIO, BytesIO
import urllib.parse as urlparse
from urllib.request import pathname2url
from lxml import etree, html
def make_version_tuple(version_string):
return tuple(
int(part) if part.isdigit() else part
for part in re.findall('([0-9]+|[^0-9.]+)', version_string)
)
IS_PYPY = (getattr(sys, 'implementation', None) == 'pypy' or
getattr(sys, 'pypy_version_info', None) is not None)
from xml.etree import ElementTree
if hasattr(ElementTree, 'VERSION'):
ET_VERSION = make_version_tuple(ElementTree.VERSION)
else:
ET_VERSION = (0,0,0)
DOC_DIR = os.path.join(os.path.dirname(os.path.dirname(os.path.dirname(__file__))), 'doc')
def filter_by_version(test_class, version_dict, current_version):
"""Remove test methods that do not work with the current lib version.
"""
find_required_version = version_dict.get
def dummy_test_method(self):
pass
for name in dir(test_class):
expected_version = find_required_version(name, (0,0,0))
if expected_version > current_version:
setattr(test_class, name, dummy_test_method)
def needs_libxml(*version):
return unittest.skipIf(
etree.LIBXML_VERSION < version,
"needs libxml2 >= %s.%s.%s" % (version + (0, 0, 0))[:3])
import doctest
try:
import pytest
except ImportError:
class skipif:
"Using a class because a function would bind into a method when used in classes"
def __init__(self, *args): pass
def __call__(self, func, *args): return func
else:
skipif = pytest.mark.skipif
unichr_escape = re.compile(r'\\u[0-9a-fA-F]{4}|\\U[0-9a-fA-F]{8}')
# Python 3
from codecs import unicode_escape_decode
def _str(s, encoding="UTF-8"):
return unichr_escape.sub(lambda x: unicode_escape_decode(x.group(0))[0], s)
def _bytes(s, encoding="UTF-8"):
return s.encode(encoding)
from io import BytesIO as _BytesIO
def BytesIO(*args):
if args and isinstance(args[0], str):
args = (args[0].encode("UTF-8"),)
return _BytesIO(*args)
doctest_parser = doctest.DocTestParser()
def make_doctest(filename):
file_path = os.path.join(DOC_DIR, filename)
return doctest.DocFileSuite(file_path, module_relative=False, encoding='utf-8')
class HelperTestCase(unittest.TestCase):
def tearDown(self):
if DEBUG_PROXY_ISSUES:
gc.collect()
def parse(self, text, parser=None):
f = BytesIO(text) if isinstance(text, bytes) else StringIO(text)
return etree.parse(f, parser=parser)
def _rootstring(self, tree):
return etree.tostring(tree.getroot()).replace(
b' ', b'').replace(b'\n', b'')
class SillyFileLike:
def __init__(self, xml_data=b'<foo><bar/></foo>'):
self.xml_data = xml_data
def read(self, amount=None):
if self.xml_data:
if amount:
data = self.xml_data[:amount]
self.xml_data = self.xml_data[amount:]
else:
data = self.xml_data
self.xml_data = b''
return data
return b''
class LargeFileLike:
def __init__(self, charlen=100, depth=4, children=5):
self.data = BytesIO()
self.chars = b'a' * charlen
self.children = range(children)
self.more = self.iterelements(depth)
def iterelements(self, depth):
yield b'<root>'
depth -= 1
if depth > 0:
for child in self.children:
yield from self.iterelements(depth)
yield self.chars
else:
yield self.chars
yield b'</root>'
def read(self, amount=None):
data = self.data
append = data.write
if amount:
for element in self.more:
append(element)
if data.tell() >= amount:
break
else:
for element in self.more:
append(element)
result = data.getvalue()
data.seek(0)
data.truncate()
if amount:
append(result[amount:])
result = result[:amount]
return result
class LargeFileLikeUnicode(LargeFileLike):
def __init__(self, charlen=100, depth=4, children=5):
LargeFileLike.__init__(self, charlen, depth, children)
self.data = StringIO()
self.chars = 'a' * charlen
self.more = self.iterelements(depth)
def iterelements(self, depth):
yield '<root>'
depth -= 1
if depth > 0:
for child in self.children:
yield from self.iterelements(depth)
yield self.chars
else:
yield self.chars
yield '</root>'
class SimpleFSPath:
def __init__(self, path):
self.path = path
def __fspath__(self):
return self.path
def fileInTestDir(name):
_testdir = os.path.dirname(__file__)
return os.path.join(_testdir, name)
def path2url(path):
return urlparse.urljoin(
'file:', pathname2url(path))
def fileUrlInTestDir(name):
return path2url(fileInTestDir(name))
def read_file(name, mode='r'):
with open(name, mode) as f:
data = f.read()
return data
def write_to_file(name, data, mode='w'):
with open(name, mode) as f:
f.write(data)
def readFileInTestDir(name, mode='r'):
return read_file(fileInTestDir(name), mode)
def canonicalize(xml):
tree = etree.parse(BytesIO(xml) if isinstance(xml, bytes) else StringIO(xml))
f = BytesIO()
tree.write_c14n(f)
return f.getvalue()
@contextmanager
def tmpfile(**kwargs):
handle, filename = tempfile.mkstemp(**kwargs)
try:
yield filename
finally:
os.close(handle)
os.remove(filename)