reader3.py

libxml,在UNIX/LINUX下非常重要的一个库,为XML相关应用提供方便.目前上载的是最新版本,若要取得最新版本,请参考里面的readme.

#!/usr/bin/python -u
#
# this tests the entities substitutions with the XmlTextReader interface
#
import sys
import StringIO
import libxml2

docstr="""<?xml version='1.0'?>
<!DOCTYPE doc [
<!ENTITY tst "<p>test</p>">
]>
<doc>&tst;</doc>"""

# Memory debug specific
libxml2.debugMemory(1)

#
# First test, normal don't substitute entities.
#
f = StringIO.StringIO(docstr)
input = libxml2.inputBuffer(f)
reader = input.newTextReader("test_noent")
ret = reader.Read()
if ret != 1:
    print "Error reading to root"
    sys.exit(1)
if reader.Name() == "doc" or reader.NodeType() == 10:
    ret = reader.Read()
if ret != 1:
    print "Error reading to root"
    sys.exit(1)
if reader.Name() != "doc" or reader.NodeType() != 1:
    print "test_normal: Error reading the root element"
    sys.exit(1)
ret = reader.Read()
if ret != 1:
    print "test_normal: Error reading to the entity"
    sys.exit(1)
if reader.Name() != "tst" or reader.NodeType() != 5:
    print "test_normal: Error reading the entity"
    sys.exit(1)
ret = reader.Read()
if ret != 1:
    print "test_normal: Error reading to the end of root"
    sys.exit(1)
if reader.Name() != "doc" or reader.NodeType() != 15:
    print "test_normal: Error reading the end of the root element"
    sys.exit(1)
ret = reader.Read()
if ret != 0:
    print "test_normal: Error detecting the end"
    sys.exit(1)

#
# Second test, completely substitute the entities.
#
f = StringIO.StringIO(docstr)
input = libxml2.inputBuffer(f)
reader = input.newTextReader("test_noent")
reader.SetParserProp(libxml2.PARSER_SUBST_ENTITIES, 1)
ret = reader.Read()
if ret != 1:
    print "Error reading to root"
    sys.exit(1)
if reader.Name() == "doc" or reader.NodeType() == 10:
    ret = reader.Read()
if ret != 1:
    print "Error reading to root"
    sys.exit(1)
if reader.Name() != "doc" or reader.NodeType() != 1:
    print "test_noent: Error reading the root element"
    sys.exit(1)
ret = reader.Read()
if ret != 1:
    print "test_noent: Error reading to the entity content"
    sys.exit(1)
if reader.Name() != "p" or reader.NodeType() != 1:
    print "test_noent: Error reading the p element from entity"
    sys.exit(1)
ret = reader.Read()
if ret != 1:
    print "test_noent: Error reading to the text node"
    sys.exit(1)
if reader.NodeType() != 3 or reader.Value() != "test":
    print "test_noent: Error reading the text node"
    sys.exit(1)
ret = reader.Read()
if ret != 1:
    print "test_noent: Error reading to the end of p element"
    sys.exit(1)
if reader.Name() != "p" or reader.NodeType() != 15:
    print "test_noent: Error reading the end of the p element"
    sys.exit(1)
ret = reader.Read()
if ret != 1:
    print "test_noent: Error reading to the end of root"
    sys.exit(1)
if reader.Name() != "doc" or reader.NodeType() != 15:
    print "test_noent: Error reading the end of the root element"
    sys.exit(1)
ret = reader.Read()
if ret != 0:
    print "test_noent: Error detecting the end"
    sys.exit(1)

#
# third test, crazy stuff about empty element in external parsed entities
#
s = """<!DOCTYPE struct [
<!ENTITY simplestruct2.ent SYSTEM "simplestruct2.ent">
]>
<struct>&simplestruct2.ent;</struct>
"""
expect="""10 struct 0 0
1 struct 0 0
1 descr 1 1
15 struct 0 0
"""
res=""
simplestruct2_ent="""<descr/>"""

def myResolver(URL, ID, ctxt):
    if URL == "simplestruct2.ent":
        return(StringIO.StringIO(simplestruct2_ent))
    return None

libxml2.setEntityLoader(myResolver)

input = libxml2.inputBuffer(StringIO.StringIO(s))
reader = input.newTextReader("test3")
reader.SetParserProp(libxml2.PARSER_SUBST_ENTITIES,1)
while reader.Read() == 1:
    res = res + "%s %s %d %d\n" % (reader.NodeType(),reader.Name(),
                                   reader.Depth(),reader.IsEmptyElement())

if res != expect:
    print "test3 failed: unexpected output"
    print res
    sys.exit(1)

#
# cleanup
#
del f
del input
del reader

# Memory debug specific
libxml2.cleanupParser()
if libxml2.debugMemory(1) == 0:
    print "OK"
else:
    print "Memory leak %d bytes" % (libxml2.debugMemory(1))
    libxml2.dumpMemory()