Source Code for Module lxml.tests.common_imports

  1  import os 
  2  import os.path 
  3  import re 
  4  import gc 
  5  import sys 
  6  import unittest 
  7   
  8  try: 
  9      import urlparse 
 10  except ImportError: 
 11      import urllib.parse as urlparse  
 12   
 13  try: 
 14      from urllib import pathname2url 
 15  except: 
 16      from urllib.request import pathname2url 
 17   
 18  from lxml import etree 
 19   
 20 -def make_version_tuple(version_string): 
 21      l = [] 
 22      for part in re.findall('([0-9]+|[^0-9.]+)', version_string): 
 23          try: 
 24              l.append(int(part)) 
 25          except ValueError: 
 26              l.append(part) 
 27      return tuple(l) 
 28   
 29  IS_PYPY = (getattr(sys, 'implementation', None) == 'pypy' or 
 30             getattr(sys, 'pypy_version_info', None) is not None) 
 31   
 32  IS_PYTHON3 = sys.version_info[0] >= 3 
 33   
 34  try: 
 35      from xml.etree import ElementTree # Python 2.5+ 
 36  except ImportError: 
 37      try: 
 38          from elementtree import ElementTree # standard ET 
 39      except ImportError: 
 40          ElementTree = None 
 41   
 42  if hasattr(ElementTree, 'VERSION'): 
 43      ET_VERSION = make_version_tuple(ElementTree.VERSION) 
 44  else: 
 45      ET_VERSION = (0,0,0) 
 46   
 47  try: 
 48      from xml.etree import cElementTree # Python 2.5+ 
 49  except ImportError: 
 50      try: 
 51          import cElementTree # standard ET 
 52      except ImportError: 
 53          cElementTree = None 
 54   
 55  if hasattr(cElementTree, 'VERSION'): 
 56      CET_VERSION = make_version_tuple(cElementTree.VERSION) 
 57  else: 
 58      CET_VERSION = (0,0,0) 
 59   
 60 -def filter_by_version(test_class, version_dict, current_version): 
 61      """Remove test methods that do not work with the current lib version. 
 62      """ 
 63      find_required_version = version_dict.get 
 64      def dummy_test_method(self): 
 65          pass 
 66      for name in dir(test_class): 
 67          expected_version = find_required_version(name, (0,0,0)) 
 68          if expected_version > current_version: 
 69              setattr(test_class, name, dummy_test_method) 
 70   
 71  try: 
 72      import doctest 
 73      # check if the system version has everything we need 
 74      doctest.DocFileSuite 
 75      doctest.DocTestParser 
 76      doctest.NORMALIZE_WHITESPACE 
 77      doctest.ELLIPSIS 
 78  except (ImportError, AttributeError): 
 79      # we need our own version to make it work (Python 2.3?) 
 80      import local_doctest as doctest 
 81   
 82  try: 
 83      sorted 
 84  except NameError: 
 85 -    def sorted(seq, **kwargs): 
 86          seq = list(seq) 
 87          seq.sort(**kwargs) 
 88          return seq 
 89  else: 
 90      locals()['sorted'] = sorted 
 91   
 92   
 93  try: 
 94      next 
 95  except NameError: 
 96 -    def next(it): 
 97          return it.next() 
 98  else: 
 99      locals()['next'] = next 
100   
101   
102  try: 
103      import pytest 
104  except ImportError: 
105 -    class skipif(object): 
106          "Using a class because a function would bind into a method when used in classes" 
107 -        def __init__(self, *args): pass 
108 -        def __call__(self, func, *args): return func 
109  else: 
110      skipif = pytest.mark.skipif 
111   
112 -def _get_caller_relative_path(filename, frame_depth=2): 
113      module = sys.modules[sys._getframe(frame_depth).f_globals['__name__']] 
114      return os.path.normpath(os.path.join( 
115              os.path.dirname(getattr(module, '__file__', '')), filename)) 
116   
117  if sys.version_info[0] >= 3: 
118      # Python 3 
119      from builtins import str as unicode 
120 -    def _str(s, encoding="UTF-8"): 
121          return s 
122 -    def _bytes(s, encoding="UTF-8"): 
123          return s.encode(encoding) 
124      from io import StringIO, BytesIO as _BytesIO 
125 -    def BytesIO(*args): 
126          if args and isinstance(args[0], str): 
127              args = (args[0].encode("UTF-8"),) 
128          return _BytesIO(*args) 
129   
130      doctest_parser = doctest.DocTestParser() 
131      _fix_unicode = re.compile(r'(\s+)u(["\'])').sub 
132      _fix_exceptions = re.compile(r'(.*except [^(]*),\s*(.*:)').sub 
133 -    def make_doctest(filename): 
134          filename = _get_caller_relative_path(filename) 
135          doctests = read_file(filename) 
136          doctests = _fix_unicode(r'\1\2', doctests) 
137          doctests = _fix_exceptions(r'\1 as \2', doctests) 
138          return doctest.DocTestCase( 
139              doctest_parser.get_doctest( 
140                  doctests, {}, os.path.basename(filename), filename, 0)) 
141  else: 
142      # Python 2 
143      from __builtin__ import unicode 
144 -    def _str(s, encoding="UTF-8"): 
145          return unicode(s, encoding=encoding) 
146 -    def _bytes(s, encoding="UTF-8"): 
147          return s 
148      from StringIO import StringIO 
149      BytesIO = StringIO 
150   
151      doctest_parser = doctest.DocTestParser() 
152      _fix_traceback = re.compile(r'^(\s*)(?:\w+\.)+(\w*(?:Error|Exception|Invalid):)', re.M).sub 
153      _fix_exceptions = re.compile(r'(.*except [^(]*)\s+as\s+(.*:)').sub 
154      _fix_bytes = re.compile(r'(\s+)b(["\'])').sub 
155 -    def make_doctest(filename): 
156          filename = _get_caller_relative_path(filename) 
157          doctests = read_file(filename) 
158          doctests = _fix_traceback(r'\1\2', doctests) 
159          doctests = _fix_exceptions(r'\1, \2', doctests) 
160          doctests = _fix_bytes(r'\1\2', doctests) 
161          return doctest.DocTestCase( 
162              doctest_parser.get_doctest( 
163                  doctests, {}, os.path.basename(filename), filename, 0)) 
164   
165  try: 
166      skipIf = unittest.skipIf 
167  except AttributeError: 
168 -    def skipIf(condition, why, 
169                 _skip=lambda test_method: None, 
170                 _keep=lambda test_method: test_method): 
171          if condition: 
172              return _skip 
173          return _keep 
174   
175 -class HelperTestCase(unittest.TestCase): 
176 -    def tearDown(self): 
177          gc.collect() 
178   
179 -    def parse(self, text, parser=None): 
180          f = BytesIO(text) 
181          return etree.parse(f, parser=parser) 
182       
183 -    def _rootstring(self, tree): 
184          return etree.tostring(tree.getroot()).replace( 
185              _bytes(' '), _bytes('')).replace(_bytes('\n'), _bytes('')) 
186   
187      # assertFalse doesn't exist in Python 2.3 
188      try: 
189          unittest.TestCase.assertFalse 
190      except AttributeError: 
191          assertFalse = unittest.TestCase.failIf 
192           
193 -class SillyFileLike: 
194 -    def __init__(self, xml_data=_bytes('<foo><bar/></foo>')): 
195          self.xml_data = xml_data 
196           
197 -    def read(self, amount=None): 
198          if self.xml_data: 
199              if amount: 
200                  data = self.xml_data[:amount] 
201                  self.xml_data = self.xml_data[amount:] 
202              else: 
203                  data = self.xml_data 
204                  self.xml_data = _bytes('') 
205              return data 
206          return _bytes('') 
207   
208 -class LargeFileLike: 
209 -    def __init__(self, charlen=100, depth=4, children=5): 
210          self.data = BytesIO() 
211          self.chars  = _bytes('a') * charlen 
212          self.children = range(children) 
213          self.more = self.iterelements(depth) 
214   
215 -    def iterelements(self, depth): 
216          yield _bytes('<root>') 
217          depth -= 1 
218          if depth > 0: 
219              for child in self.children: 
220                  for element in self.iterelements(depth): 
221                      yield element 
222                  yield self.chars 
223          else: 
224              yield self.chars 
225          yield _bytes('</root>') 
226   
227 -    def read(self, amount=None): 
228          data = self.data 
229          append = data.write 
230          if amount: 
231              for element in self.more: 
232                  append(element) 
233                  if data.tell() >= amount: 
234                      break 
235          else: 
236              for element in self.more: 
237                  append(element) 
238          result = data.getvalue() 
239          data.seek(0) 
240          data.truncate() 
241          if amount: 
242              append(result[amount:]) 
243              result = result[:amount] 
244          return result 
245   
246 -class LargeFileLikeUnicode(LargeFileLike): 
247 -    def __init__(self, charlen=100, depth=4, children=5): 
248          LargeFileLike.__init__(self, charlen, depth, children) 
249          self.data = StringIO() 
250          self.chars  = _str('a') * charlen 
251          self.more = self.iterelements(depth) 
252   
253 -    def iterelements(self, depth): 
254          yield _str('<root>') 
255          depth -= 1 
256          if depth > 0: 
257              for child in self.children: 
258                  for element in self.iterelements(depth): 
259                      yield element 
260                  yield self.chars 
261          else: 
262              yield self.chars 
263          yield _str('</root>') 
264   
265 -def fileInTestDir(name): 
266      _testdir = os.path.dirname(__file__) 
267      return os.path.join(_testdir, name) 
268   
269 -def path2url(path): 
270      return urlparse.urljoin( 
271          'file:', pathname2url(path)) 
272   
273 -def fileUrlInTestDir(name): 
274      return path2url(fileInTestDir(name)) 
275   
276 -def read_file(name, mode='r'): 
277      f = open(name, mode) 
278      try: 
279          data = f.read() 
280      finally: 
281          f.close() 
282      return data 
283   
284 -def write_to_file(name, data, mode='w'): 
285      f = open(name, mode) 
286      try: 
287          data = f.write(data) 
288      finally: 
289          f.close() 
290   
291 -def readFileInTestDir(name, mode='r'): 
292      return read_file(fileInTestDir(name), mode) 
293   
294 -def canonicalize(xml): 
295      tree = etree.parse(BytesIO(xml)) 
296      f = BytesIO() 
297      tree.write_c14n(f) 
298      return f.getvalue() 
299   
300 -def unentitify(xml): 
301      for entity_name, value in re.findall("(&#([0-9]+);)", xml): 
302          xml = xml.replace(entity_name, unichr(int(value))) 
303      return xml 
304