Annotation of embedaddon/libxml2/python/tests/input_callback.py, revision 1.1.1.1
1.1 misho 1: #!/usr/bin/python -u
2: #
3: # This tests custom input callbacks
4: #
5: import sys
6: import libxml2
7: try:
8: import StringIO
9: str_io = StringIO.StringIO
10: except:
11: import io
12: str_io = io.StringIO
13:
14: # We implement a new scheme, py://strings/ that will reference this dictionary
15: pystrings = {
16: 'catalogs/catalog.xml' :
17: '''<?xml version="1.0" encoding="utf-8"?>
18: <!DOCTYPE catalog PUBLIC "-//OASIS//DTD Entity Resolution XML Catalog V1.0//EN" "http://www.oasis-open.org/committees/entity/release/1.0/catalog.dtd">
19: <catalog xmlns="urn:oasis:names:tc:entity:xmlns:xml:catalog">
20: <rewriteSystem systemIdStartString="http://example.com/dtds/" rewritePrefix="../dtds/"/>
21: </catalog>''',
22:
23: 'xml/sample.xml' :
24: '''<?xml version="1.0" encoding="utf-8"?>
25: <!DOCTYPE root SYSTEM "http://example.com/dtds/sample.dtd">
26: <root>&sample.entity;</root>''',
27:
28: 'dtds/sample.dtd' :
29: '''
30: <!ELEMENT root (#PCDATA)>
31: <!ENTITY sample.entity "replacement text">'''
32: }
33:
34: prefix = "py://strings/"
35: startURL = prefix + "xml/sample.xml"
36: catURL = prefix + "catalogs/catalog.xml"
37:
38: def my_input_cb(URI):
39: if not(URI.startswith(prefix)):
40: return None
41: path = URI[len(prefix):]
42: if path not in pystrings:
43: return None
44: return str_io(pystrings[path])
45:
46:
47: def run_test(desc, docpath, catalog, exp_status="verified", exp_err=[], test_callback=None,
48: root_name="root", root_content="replacement text"):
49: opts = libxml2.XML_PARSE_DTDLOAD | libxml2.XML_PARSE_NONET | libxml2.XML_PARSE_COMPACT
50: actual_err = []
51:
52: def my_global_error_cb(ctx, msg):
53: actual_err.append((-1, msg))
54: def my_ctx_error_cb(arg, msg, severity, reserved):
55: actual_err.append((severity, msg))
56:
57: libxml2.registerErrorHandler(my_global_error_cb, None)
58: try:
59: parser = libxml2.createURLParserCtxt(docpath, opts)
60: parser.setErrorHandler(my_ctx_error_cb, None)
61: if catalog is not None:
62: parser.addLocalCatalog(catalog)
63: if test_callback is not None:
64: test_callback()
65: parser.parseDocument()
66: doc = parser.doc()
67: actual_status = "loaded"
68: e = doc.getRootElement()
69: if e.name == root_name and e.content == root_content:
70: actual_status = "verified"
71: doc.freeDoc()
72: except libxml2.parserError:
73: actual_status = "not loaded"
74:
75: if actual_status != exp_status:
76: print("Test '%s' failed: expect status '%s', actual '%s'" % (desc, exp_status, actual_status))
77: sys.exit(1)
78: elif actual_err != exp_err:
79: print("Test '%s' failed" % desc)
80: print("Expect errors:")
81: for s,m in exp_err: print(" [%2d] '%s'" % (s,m))
82: print("Actual errors:")
83: for s,m in actual_err: print(" [%2d] '%s'" % (s,m))
84: sys.exit(1)
85:
86:
87: # Check that we cannot read custom schema without custom callback
88: run_test(desc="Loading entity without custom callback",
89: docpath=startURL, catalog=None,
90: exp_status="not loaded", exp_err=[
91: (-1, "I/O "),
92: (-1, "warning : "),
93: (-1, "failed to load external entity \"py://strings/xml/sample.xml\"\n")
94: ])
95:
96: # Register handler and try to load the same entity
97: libxml2.registerInputCallback(my_input_cb)
98: run_test(desc="Loading entity with custom callback",
99: docpath=startURL, catalog=None,
100: exp_status="loaded", exp_err=[
101: (-1, "Attempt to load network entity http://example.com/dtds/sample.dtd"),
102: ( 4, "Entity 'sample.entity' not defined\n")
103: ])
104:
105: # Register a catalog (also accessible via pystr://) and retry
106: run_test(desc="Loading entity with custom callback and catalog",
107: docpath=startURL, catalog=catURL)
108:
109: # Unregister custom callback when parser is already created
110: run_test(desc="Loading entity and unregistering callback",
111: docpath=startURL, catalog=catURL,
112: test_callback=lambda: libxml2.popInputCallbacks(),
113: exp_status="loaded", exp_err=[
114: ( 3, "failed to load external entity \"py://strings/dtds/sample.dtd\"\n"),
115: ( 4, "Entity 'sample.entity' not defined\n")
116: ])
117:
118: # Try to load the document again
119: run_test(desc="Retry loading document after unregistering callback",
120: docpath=startURL, catalog=catURL,
121: exp_status="not loaded", exp_err=[
122: (-1, "I/O "),
123: (-1, "warning : "),
124: (-1, "failed to load external entity \"py://strings/xml/sample.xml\"\n")
125: ])
126:
127: # But should be able to read standard I/O yet...
128: run_test(desc="Loading using standard i/o after unregistering callback",
129: docpath="tst.xml", catalog=None,
130: root_name='doc', root_content='bar')
131:
132: # Now pop ALL input callbacks, should fail to load even standard I/O
133: try:
134: while True:
135: libxml2.popInputCallbacks()
136: except IndexError:
137: pass
138:
139: run_test(desc="Loading using standard i/o after unregistering all callbacks",
140: docpath="tst.xml", catalog=None,
141: exp_status="not loaded", exp_err=[
142: (-1, "I/O "),
143: (-1, "warning : "),
144: (-1, "failed to load external entity \"tst.xml\"\n")
145: ])
146:
147: print("OK")
148: sys.exit(0);
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