#!/usr/bin/python -uimport sysimport libxml2 #memory debug specificlibxml2.debugMemory(1) called = "" def foo(ctx, x):    global called     #    # test that access to the XPath evaluation contexts    #    pctxt = libxml2.xpathParserContext(_obj=ctx)    ctxt = pctxt.context()    called = ctxt.function()    return x + 1 def bar(ctxt, x):    return "%d" % (x + 2) doc = libxml2.parseFile("tst.xml")ctxt = doc.xpathNewContext()res = ctxt.xpathEval("//*")if len(res) != 2:    print "xpath query: wrong node set size"    sys.exit(1)if res[0].name != "doc" or res[1].name != "foo":    print "xpath query: wrong node set value"    sys.exit(1)libxml2.registerXPathFunction(ctxt._o, "foo", None, foo)libxml2.registerXPathFunction(ctxt._o, "bar", None, bar)i = 10000while i > 0:    res = ctxt.xpathEval("foo(1)")    if res != 2:        print "xpath extension failure"        sys.exit(1)    i = i - 1i = 10000while i > 0:    res = ctxt.xpathEval("bar(1)")    if res != "3":        print "xpath extension failure got %s expecting '3'"        sys.exit(1)    i = i - 1doc.freeDoc()ctxt.xpathFreeContext() if called != "foo":    print "xpath function: failed to access the context"    print "xpath function: %s" % (called)    sys.exit(1) #memory debug specificlibxml2.cleanupParser()if libxml2.debugMemory(1) == 0:    print "OK"else:    print "Memory leak %d bytes" % (libxml2.debugMemory(1))    libxml2.dumpMemory()