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