lxml.tests.test_external_document

Package lxml :: Package tests :: Module test_external_document |
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# Source Code for Module lxml.tests.test_external_document

      1  # -*- coding: utf-8 -*-
      2  """
      3  Test cases related to direct loading of external libxml2 documents
      4  """
      5
      6  from __future__ import absolute_import
      7
      8  import sys
      9  import unittest
     10
     11  from .common_imports import HelperTestCase, etree
     12
     13  DOC_NAME = b'libxml2:xmlDoc'
     14  DESTRUCTOR_NAME = b'destructor:xmlFreeDoc'
     15
     16
     17 -class ExternalDocumentTestCase(HelperTestCase):
     18 -    def setUp(self):
     19          import ctypes
     20          from ctypes import pythonapi
     21          from ctypes.util import find_library
     22
     23          def wrap(func, restype, *argtypes):
     24              func.restype = restype
     25              func.argtypes = list(argtypes)
     26              return func
     27
     28          self.get_capsule_name = wrap(pythonapi.PyCapsule_GetName,
     29                                       ctypes.c_char_p, ctypes.py_object)
     30          self.capsule_is_valid = wrap(pythonapi.PyCapsule_IsValid, ctypes.c_int,
     31                                       ctypes.py_object, ctypes.c_char_p)
     32          self.new_capsule = wrap(pythonapi.PyCapsule_New, ctypes.py_object,
     33                                  ctypes.c_void_p, ctypes.c_char_p,
     34                                  ctypes.c_void_p)
     35          self.set_capsule_name = wrap(pythonapi.PyCapsule_SetName, ctypes.c_int,
     36                                       ctypes.py_object, ctypes.c_char_p)
     37          self.set_capsule_context = wrap(pythonapi.PyCapsule_SetContext,
     38                                          ctypes.c_int, ctypes.py_object,
     39                                          ctypes.c_char_p)
     40          self.get_capsule_context = wrap(pythonapi.PyCapsule_GetContext,
     41                                          ctypes.c_char_p, ctypes.py_object)
     42          self.get_capsule_pointer = wrap(pythonapi.PyCapsule_GetPointer,
     43                                          ctypes.c_void_p, ctypes.py_object,
     44                                          ctypes.c_char_p)
     45          self.set_capsule_pointer = wrap(pythonapi.PyCapsule_SetPointer,
     46                                          ctypes.c_int, ctypes.py_object,
     47                                          ctypes.c_void_p)
     48          self.set_capsule_destructor = wrap(pythonapi.PyCapsule_SetDestructor,
     49                                             ctypes.c_int, ctypes.py_object,
     50                                             ctypes.c_void_p)
     51          self.PyCapsule_Destructor = ctypes.CFUNCTYPE(None, ctypes.py_object)
     52          libxml2 = ctypes.CDLL(find_library('xml2'))
     53          self.create_doc = wrap(libxml2.xmlReadMemory, ctypes.c_void_p,
     54                                 ctypes.c_char_p, ctypes.c_int, ctypes.c_char_p,
     55                                 ctypes.c_char_p, ctypes.c_int)
     56          self.free_doc = wrap(libxml2.xmlFreeDoc, None, ctypes.c_void_p)
     57
     58 -    def as_capsule(self, text, capsule_name=DOC_NAME):
     59          if not isinstance(text, bytes):
     60              text = text.encode('utf-8')
     61          doc = self.create_doc(text, len(text), b'base.xml', b'utf-8', 0)
     62          ans = self.new_capsule(doc, capsule_name, None)
     63          self.set_capsule_context(ans, DESTRUCTOR_NAME)
     64          return ans
     65
     66 -    def test_external_document_adoption(self):
     67          xml = '<r a="1">t</r>'
     68          self.assertRaises(TypeError, etree.adopt_external_document, None)
     69          capsule = self.as_capsule(xml)
     70          self.assertTrue(self.capsule_is_valid(capsule, DOC_NAME))
     71          self.assertEqual(DOC_NAME, self.get_capsule_name(capsule))
     72          # Create an lxml tree from the capsule (this is a move not a copy)
     73          root = etree.adopt_external_document(capsule).getroot()
     74          self.assertIsNone(self.get_capsule_name(capsule))
     75          self.assertEqual(root.text, 't')
     76          root.text = 'new text'
     77          # Now reset the capsule so we can copy it
     78          self.assertEqual(0, self.set_capsule_name(capsule, DOC_NAME))
     79          self.assertEqual(0, self.set_capsule_context(capsule, b'invalid'))
     80          # Create an lxml tree from the capsule (this is a copy not a move)
     81          root2 = etree.adopt_external_document(capsule).getroot()
     82          self.assertEqual(self.get_capsule_context(capsule), b'invalid')
     83          # Check that the modification to the tree using the transferred
     84          # document was successful
     85          self.assertEqual(root.text, root2.text)
     86          # Check that further modifications do not show up in the copy (they are
     87          # disjoint)
     88          root.text = 'other text'
     89          self.assertNotEqual(root.text, root2.text)
     90          # delete root and ensure root2 survives
     91          del root
     92          self.assertEqual(root2.text, 'new text')
     93
     94
     95 -def test_suite():
     96      suite = unittest.TestSuite()
     97      if sys.platform != 'win32':
     98          suite.addTests([unittest.makeSuite(ExternalDocumentTestCase)])
     99      return suite
    100
    101
    102  if __name__ == '__main__':
    103      print('to test use test.py %s' % __file__)
    104