1f780e48af
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@33440 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
650 lines
27 KiB
Python
650 lines
27 KiB
Python
#----------------------------------------------------------------------------
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# Name: xmlmarshaller.py
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# Purpose:
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#
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# Author: John Spurling
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#
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# Created: 7/28/04
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# CVS-ID: $Id$
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# Copyright: (c) 2004-2005 ActiveGrid, Inc.
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# License: wxWindows License
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#----------------------------------------------------------------------------
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from activegrid import util
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import inspect
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from types import *
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import xml.sax
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import xml.sax.handler
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import __builtin__
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from xml.sax import saxutils
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### ToDO remove maxOccurs "unbounded" resolves to -1 hacks after bug 177 is fixed
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"""
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More documentation later, but here are some special Python attributes
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that McLane recognizes:
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name: __xmlname__
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type: string
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description: the name of the xml element for the marshalled object
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name: __xmlattributes__
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type: tuple or list
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description: the name(s) of the Python string attribute(s) to be
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marshalled as xml attributes instead of nested xml elements. currently
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these can only be strings since there's not a way to get the type
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information back when unmarshalling.
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name: __xmlexclude__
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type: tuple or list
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description: the name(s) of the python attribute(s) to skip when
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marshalling.
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name: __xmlrename__
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type: dict
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description: describes an alternate Python <-> XML name mapping.
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Normally the name mapping is the identity function. __xmlrename__
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overrides that. The keys are the Python names, the values are their
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associated XML names.
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name: __xmlflattensequence__
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type: dict, tuple, or list
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description: the name(s) of the Python sequence attribute(s) whose
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items are to be marshalled as a series of xml elements (with an
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optional keyword argument that specifies the element name to use) as
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opposed to containing them in a separate sequence element, e.g.:
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myseq = (1, 2)
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<!-- normal way of marshalling -->
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<myseq>
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<item objtype='int'>1</item>
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<item objtype='int'>2</item>
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</myseq>
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<!-- with __xmlflattensequence__ set to {'myseq': 'squish'} -->
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<squish objtype='int'>1</squish>
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<squish objtype='int'>2</squish>
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name: __xmlnamespaces__
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type: dict
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description: a dict of the namespaces that the object uses. Each item
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in the dict should consist of a prefix,url combination where the key is
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the prefix and url is the value, e.g.:
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__xmlnamespaces__ = { "xsd":"http://www.w3c.org/foo.xsd" }
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name: __xmldefaultnamespace__
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type: String
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description: the prefix of a namespace defined in __xmlnamespaces__ that
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should be used as the default namespace for the object.
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name: __xmlattrnamespaces__
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type: dict
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description: a dict assigning the Python object's attributes to the namespaces
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defined in __xmlnamespaces__. Each item in the dict should consist of a
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prefix,attributeList combination where the key is the prefix and the value is
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a list of the Python attribute names. e.g.:
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__xmlattrnamespaces__ = { "ag":["firstName", "lastName", "addressLine1", "city"] }
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"""
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################################################################################
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#
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# module exceptions
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#
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################################################################################
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class Error(Exception):
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"""Base class for errors in this module."""
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pass
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class UnhandledTypeException(Error):
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"""Exception raised when attempting to marshal an unsupported
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type.
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"""
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def __init__(self, typename):
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self.typename = typename
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def __str__(self):
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return "%s is not supported for marshalling." % str(self.typename)
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class XMLAttributeIsNotStringType(Error):
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"""Exception raised when an object's attribute is specified to be
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marshalled as an XML attribute of the enclosing object instead of
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a nested element.
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"""
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def __init__(self, attrname, typename):
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self.attrname = attrname
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self.typename = typename
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def __str__(self):
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return """%s was set to be marshalled as an XML attribute
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instead of a nested element, but the object's type is %s, not
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string.""" % (self.attrname, self.typename)
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################################################################################
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#
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# constants and such
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#
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################################################################################
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XMLNS = 'xmlns'
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XMLNS_PREFIX = XMLNS + ':'
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XMLNS_PREFIX_LENGTH = len(XMLNS_PREFIX)
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BASETYPE_ELEMENT_NAME = 'item'
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MEMBERS_TO_SKIP = ('__module__', '__doc__', '__xmlname__', '__xmlattributes__',
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'__xmlexclude__', '__xmlflattensequence__', '__xmlnamespaces__',
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'__xmldefaultnamespace__', '__xmlattrnamespaces__')
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WELL_KNOWN_OBJECTS = { "xs:element" : "activegrid.model.schema.XsdElement",
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"xs:complexType" : "activegrid.model.schema.XsdComplexType",
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"xs:complexType" : "activegrid.model.schema.XsdComplexType",
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"xs:element" : "activegrid.model.schema.XsdElement",
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"xs:key" : "activegrid.model.schema.XsdKey",
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"xs:field" : "activegrid.model.schema.XsdKeyField",
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"xs:keyref" : "activegrid.model.schema.XsdKeyRef",
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"xs:selector" : "activegrid.model.schema.XsdKeySelector",
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"xs:schema" : "activegrid.model.schema.Schema",
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"ag:schemaOptions":"activegrid.model.schema.SchemaOptions",
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"ag:debug" : "activegrid.model.processmodel.DebugOperation",
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}
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################################################################################
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#
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# classes and functions
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#
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################################################################################
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def _objectfactory(objname, objargs=None, xsname=None):
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try:
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'''dynamically create an object based on the objname and return
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it. look it up in the BASETYPE_ELEMENT_MAP first.
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'''
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## print "_objectfactory creating an object of type %s and value %s, xsname=%s" % (objname, objargs, xsname)
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# split the objname into the typename and module path,
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# importing the module if need be.
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if not isinstance(objargs, list):
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objargs = [objargs]
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if (xsname):
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try:
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objname = WELL_KNOWN_OBJECTS[xsname]
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except KeyError:
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pass
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objtype = objname.split('.')[-1]
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pathlist = objname.split('.')
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modulename = '.'.join(pathlist[0:-1])
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## print "[objectfactory] objtype is %s" % objtype
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## print "[objectfactory] objargs is %s" % `objargs`
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## since the bool constructor will turn a string of non-zero
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## length into True, we call it with no argument (yielding a
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## False) if the string contains 'false'
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if objtype == 'bool' and objargs[0].lower() == 'false':
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objargs = None
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## if objtype == 'str':
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## print type(objargs)
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## print "string we're unescaping: '%s'" % objargs[0]
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## objargs = saxutils.unescape(objargs[0])
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if objtype in ('float', 'int', 'str', 'long'):
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objargs = [x.strip() for x in objargs]
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if objtype == 'str':
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objargs = [saxutils.unescape(x) for x in objargs]
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if __builtin__.__dict__.has_key(objname):
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module = __builtin__
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else:
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if modulename:
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module = __import__(modulename)
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for name in pathlist[1:-1]:
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module = module.__dict__[name]
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if objargs:
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return module.__dict__[objtype](*objargs)
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else:
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if objtype == 'None':
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return None
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return module.__dict__[objtype]()
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except KeyError:
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raise KeyError("Could not find class %s" % objname)
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class Element:
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def __init__(self, name, attrs=None):
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self.name = name
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self.attrs = attrs
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self.content = ''
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self.children = []
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def getobjtype(self):
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if self.attrs.has_key('objtype'):
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return self.attrs.getValue('objtype')
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else:
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return 'str'
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class XMLObjectFactory(xml.sax.ContentHandler):
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def __init__(self):
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self.rootelement = None
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self.elementstack = []
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xml.sax.handler.ContentHandler.__init__(self)
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## ContentHandler methods
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def startElement(self, name, attrs):
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if name.find(':') > -1: # Strip namespace prefixes for now until actually looking them up in xsd
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name = name[name.index(':') + 1:]
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## for attrname in attrs.getNames():
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## print "%s: %s" % (attrname, attrs.getValue(attrname))
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element = Element(name, attrs.copy())
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self.elementstack.append(element)
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## print self.elementstack
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def characters(self, content):
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## print "got content: %s" % content
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if content:
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self.elementstack[-1].content += content
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def endElement(self, name):
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## print "[endElement] name of element we're at the end of: %s" % name
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xsname = name
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if name.find(':') > -1: # Strip namespace prefixes for now until actually looking them up in xsd
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name = name[name.index(':') + 1:]
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element = self.elementstack.pop()
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objtype = element.getobjtype()
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constructorarglist = []
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if element.content:
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strippedElementContent = element.content.strip()
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if strippedElementContent:
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constructorarglist.append(element.content)
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obj = _objectfactory(objtype, constructorarglist, xsname)
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complexType = None
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if hasattr(obj, '__xsdcomplextype__'):
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complexType = getattr(obj, '__xsdcomplextype__')
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if len(self.elementstack) > 0:
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self.elementstack[-1].children.append((name, obj))
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else:
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self.rootelement = obj
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if element.attrs and not isinstance(obj, list):
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for attrname, attr in element.attrs.items():
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if attrname == XMLNS or attrname.startswith(XMLNS_PREFIX):
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if attrname.startswith(XMLNS_PREFIX):
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ns = attrname[XMLNS_PREFIX_LENGTH:]
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else:
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ns = ""
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if not hasattr(obj, '__xmlnamespaces__'):
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obj.__xmlnamespaces__ = {ns:attr}
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elif ns not in obj.__xmlnamespaces__:
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if (hasattr(obj.__class__, '__xmlnamespaces__')
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and obj.__xmlnamespaces__ is obj.__class__.__xmlnamespaces__):
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obj.__xmlnamespaces__ = dict(obj.__xmlnamespaces__)
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obj.__xmlnamespaces__[ns] = attr
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elif not attrname == 'objtype':
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if attrname.find(':') > -1: # Strip namespace prefixes for now until actually looking them up in xsd
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attrname = attrname[attrname.index(':') + 1:]
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if complexType:
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xsdElement = complexType.findElement(attrname)
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if xsdElement:
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type = xsdElement.type
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if type:
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type = xsdToPythonType(type)
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### ToDO remove maxOccurs hack after bug 177 is fixed
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if attrname == "maxOccurs" and attr == "unbounded":
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attr = "-1"
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attr = _objectfactory(type, attr)
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util.setattrignorecase(obj, _toAttrName(obj, attrname), attr)
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## obj.__dict__[_toAttrName(obj, attrname)] = attr
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# stuff any child attributes meant to be in a sequence via the __xmlflattensequence__
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flattenDict = {}
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if hasattr(obj, '__xmlflattensequence__'):
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for sequencename, xmlnametuple in obj.__xmlflattensequence__.items():
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for xmlname in xmlnametuple:
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flattenDict[xmlname] = sequencename
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# reattach an object's attributes to it
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for childname, child in element.children:
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if flattenDict.has_key(childname):
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sequencename = _toAttrName(obj, flattenDict[childname])
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try:
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sequencevalue = obj.__dict__[sequencename]
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except AttributeError:
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sequencevalue = None
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if sequencevalue == None:
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sequencevalue = []
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obj.__dict__[sequencename] = sequencevalue
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sequencevalue.append(child)
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elif isinstance(obj, list):
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obj.append(child)
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else:
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## print "childname = %s, obj = %s, child = %s" % (childname, repr(obj), repr(child))
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util.setattrignorecase(obj, _toAttrName(obj, childname), child)
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## obj.__dict__[_toAttrName(obj, childname)] = child
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if complexType:
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for element in complexType.elements:
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if element.default:
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elementName = _toAttrName(obj, element.name)
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if ((elementName not in obj.__dict__) or (obj.__dict__[elementName] == None)):
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pythonType = xsdToPythonType(element.type)
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defaultValue = _objectfactory(pythonType, element.default)
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obj.__dict__[elementName] = defaultValue
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def getRootObject(self):
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return self.rootelement
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def _toAttrName(obj, name):
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if (hasattr(obj, "__xmlrename__")):
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for key, val in obj.__xmlrename__.iteritems():
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if (name == val):
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name = key
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break
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## if (name.startswith("__") and not name.endswith("__")):
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## name = "_%s%s" % (obj.__class__.__name__, name)
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return name
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__typeMappingXsdToPython = {
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"string": "str",
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"char": "str",
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"varchar": "str",
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"date": "str", # ToDO Need to work out how to create python date types
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"boolean": "bool",
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"decimal": "float", # ToDO Does python have a better fixed point type?
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"int": "int",
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"long": "long",
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"float": "float",
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"bool": "bool",
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"str": "str",
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"unicode": "unicode",
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}
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def xsdToPythonType(xsdType):
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try:
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return __typeMappingXsdToPython[xsdType]
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except KeyError:
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raise Exception("Unknown xsd type %s" % xsdType)
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def _getXmlValue(pythonValue):
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if (isinstance(pythonValue, bool)):
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return str(pythonValue).lower()
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else:
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return str(pythonValue)
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def unmarshal(xmlstr):
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objectfactory = XMLObjectFactory()
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xml.sax.parseString(xmlstr, objectfactory)
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return objectfactory.getRootObject()
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def marshal(obj, elementName=None, nameSpacePrefix='', nameSpaces=None, prettyPrint=False, indent=0):
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if prettyPrint or indent:
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prefix = ' '*indent
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newline = '\n'
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increment = 4
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else:
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prefix = ''
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newline = ''
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increment = 0
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## Determine the XML element name. If it isn't specified in the
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## parameter list, look for it in the __xmlname__ Python
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## attribute, else use the default generic BASETYPE_ELEMENT_NAME.
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if not nameSpaces: nameSpaces = {} # Need to do this since if the {} is a default parameter it gets shared by all calls into the function
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nameSpaceAttrs = ''
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if hasattr(obj, '__xmlnamespaces__'):
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for nameSpaceKey, nameSpaceUrl in getattr(obj, '__xmlnamespaces__').items():
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if nameSpaceUrl in nameSpaces:
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nameSpaceKey = nameSpaces[nameSpaceUrl]
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else:
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## # TODO: Wait to do this until there is shared state for use when going through the object graph
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## origNameSpaceKey = nameSpaceKey # Make sure there is no key collision, ie: same key referencing two different URL's
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## i = 1
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## while nameSpaceKey in nameSpaces.values():
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## nameSpaceKey = origNameSpaceKey + str(i)
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## i += 1
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nameSpaces[nameSpaceUrl] = nameSpaceKey
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if nameSpaceKey == '':
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nameSpaceAttrs += ' xmlns="%s" ' % (nameSpaceUrl)
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else:
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nameSpaceAttrs += ' xmlns:%s="%s" ' % (nameSpaceKey, nameSpaceUrl)
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nameSpaceAttrs = nameSpaceAttrs.rstrip()
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if hasattr(obj, '__xmldefaultnamespace__'):
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nameSpacePrefix = getattr(obj, '__xmldefaultnamespace__') + ':'
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if not elementName:
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if hasattr(obj, '__xmlname__'):
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elementName = nameSpacePrefix + obj.__xmlname__
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else:
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elementName = nameSpacePrefix + BASETYPE_ELEMENT_NAME
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else:
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elementName = nameSpacePrefix + elementName
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members_to_skip = []
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## Add more members_to_skip based on ones the user has selected
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## via the __xmlexclude__ attribute.
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if hasattr(obj, '__xmlexclude__'):
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members_to_skip += list(obj.__xmlexclude__)
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# Marshal the attributes that are selected to be XML attributes.
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objattrs = ''
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className = obj.__class__.__name__
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classNamePrefix = "_" + className
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if hasattr(obj, '__xmlattributes__'):
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xmlattributes = obj.__xmlattributes__
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members_to_skip += xmlattributes
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for attr in xmlattributes:
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internalAttrName = attr
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if (attr.startswith("__") and not attr.endswith("__")):
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internalAttrName = classNamePrefix + attr
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# Fail silently if a python attribute is specified to be
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# an XML attribute but is missing.
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try:
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value = obj.__dict__[internalAttrName]
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except KeyError:
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continue
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## # But, check and see if it is a property first:
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## if (hasPropertyValue(obj, attr)):
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## value = getattr(obj, attr)
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## else:
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## continue
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xsdElement = None
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if hasattr(obj, '__xsdcomplextype__'):
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complexType = getattr(obj, '__xsdcomplextype__')
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xsdElement = complexType.findElement(attr)
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if xsdElement:
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default = xsdElement.default
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if default == value or default == _getXmlValue(value):
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continue
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elif value == None:
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continue
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# ToDO remove maxOccurs hack after bug 177 is fixed
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if attr == "maxOccurs" and value == -1:
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value = "unbounded"
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if isinstance(value, bool):
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if value == True:
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value = "true"
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else:
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value = "false"
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attrNameSpacePrefix = ''
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if hasattr(obj, '__xmlattrnamespaces__'):
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for nameSpaceKey, nameSpaceAttributes in getattr(obj, '__xmlattrnamespaces__').items():
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if nameSpaceKey == nameSpacePrefix[:-1]: # Don't need to specify attribute namespace if it is the same as it selement
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continue
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if attr in nameSpaceAttributes:
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attrNameSpacePrefix = nameSpaceKey + ':'
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break
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## if attr.startswith('_'):
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## attr = attr[1:]
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if (hasattr(obj, "__xmlrename__") and attr in obj.__xmlrename__):
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attr = obj.__xmlrename__[attr]
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objattrs += ' %s%s="%s"' % (attrNameSpacePrefix, attr, value)
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objtype = type(obj)
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if isinstance(obj, NoneType):
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return ''
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# return '%s<%s objtype="None"/>%s' % (prefix, elementName, newline)
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elif isinstance(obj, bool):
|
|
return '%s<%s objtype="bool">%s</%s>%s' % (prefix, elementName, obj, elementName, newline)
|
|
elif isinstance(obj, int):
|
|
return '''%s<%s objtype="int">%s</%s>%s''' % (prefix, elementName, str(obj), elementName, newline)
|
|
elif isinstance(obj, long):
|
|
return '%s<%s objtype="long">%s</%s>%s' % (prefix, elementName, str(obj), elementName, newline)
|
|
elif isinstance(obj, float):
|
|
return '%s<%s objtype="float">%s</%s>%s' % (prefix, elementName, str(obj), elementName, newline)
|
|
elif isinstance(obj, basestring):
|
|
return '''%s<%s>%s</%s>%s''' % (prefix, elementName, saxutils.escape(obj), elementName, newline)
|
|
## elif isinstance(obj, unicode):
|
|
## return '''%s<%s>%s</%s>%s''' % (prefix, elementName, obj, elementName, newline)
|
|
elif isinstance(obj, list):
|
|
if len(obj) < 1:
|
|
return ''
|
|
xmlString = '%s<%s objtype="list">%s' % (prefix, elementName, newline)
|
|
for item in obj:
|
|
xmlString += marshal(item, nameSpaces=nameSpaces, indent=indent+increment)
|
|
xmlString += '%s</%s>%s' % (prefix, elementName, newline)
|
|
return xmlString
|
|
elif isinstance(obj, tuple):
|
|
if len(obj) < 1:
|
|
return ''
|
|
xmlString = '%s<%s objtype="list" mutable="false">%s' % (prefix, elementName, newline)
|
|
for item in obj:
|
|
xmlString += marshal(item, nameSpaces=nameSpaces, indent=indent+increment)
|
|
xmlString += '%s</%s>%s' % (prefix, elementName, newline)
|
|
return xmlString
|
|
elif isinstance(obj, dict):
|
|
xmlString = '%s<%s objtype="dict">%s' % (prefix, elementName, newline)
|
|
subprefix = prefix + ' '*increment
|
|
subindent = indent + 2*increment
|
|
for key, val in obj.iteritems():
|
|
xmlString += "%s<key>%s%s%s</key>%s%s<value>%s%s%s</value>%s" \
|
|
% (subprefix, newline, marshal(key, indent=subindent), subprefix, newline, subprefix, newline, marshal(val, nameSpaces=nameSpaces, indent=subindent), subprefix, newline)
|
|
xmlString += '%s</%s>%s' % (prefix, elementName, newline)
|
|
return xmlString
|
|
else:
|
|
moduleName = obj.__class__.__module__
|
|
if (moduleName == "activegrid.model.schema"):
|
|
xmlString = '%s<%s%s%s' % (prefix, elementName, nameSpaceAttrs, objattrs)
|
|
else:
|
|
xmlString = '%s<%s%s%s objtype="%s.%s"' % (prefix, elementName, nameSpaceAttrs, objattrs, moduleName, className)
|
|
# get the member, value pairs for the object, filtering out
|
|
# the types we don't support.
|
|
xmlMemberString = ''
|
|
if hasattr(obj, '__xmlbody__'):
|
|
xmlMemberString = getattr(obj, obj.__xmlbody__)
|
|
else:
|
|
entryList = obj.__dict__.items()
|
|
## # Add in properties
|
|
## for key in obj.__class__.__dict__.iterkeys():
|
|
## if (key not in members_to_skip and key not in obj.__dict__
|
|
## and hasPropertyValue(obj, key)):
|
|
## value = getattr(obj, key)
|
|
## entryList.append((key, value))
|
|
entryList.sort()
|
|
for name, value in entryList:
|
|
## # special name handling for private "__*" attributes:
|
|
## # remove the _<class-name> added by Python
|
|
## if name.startswith(classNamePrefix): name = name[len(classNamePrefix):]
|
|
if name in members_to_skip: continue
|
|
if name.startswith('__') and name.endswith('__'): continue
|
|
## idx = name.find('__')
|
|
## if idx > 0:
|
|
## newName = name[idx+2:]
|
|
## if newName:
|
|
## name = newName
|
|
subElementNameSpacePrefix = nameSpacePrefix
|
|
if hasattr(obj, '__xmlattrnamespaces__'):
|
|
for nameSpaceKey, nameSpaceValues in getattr(obj, '__xmlattrnamespaces__').items():
|
|
if name in nameSpaceValues:
|
|
subElementNameSpacePrefix = nameSpaceKey + ':'
|
|
break
|
|
# handle sequences listed in __xmlflattensequence__
|
|
# specially: instead of listing the contained items inside
|
|
# of a separate list, as god intended, list them inside
|
|
# the object containing the sequence.
|
|
if hasattr(obj, '__xmlflattensequence__') and name in obj.__xmlflattensequence__ and value:
|
|
try:
|
|
xmlnametuple = obj.__xmlflattensequence__[name]
|
|
xmlname = None
|
|
if len(xmlnametuple) == 1:
|
|
xmlname = xmlnametuple[0]
|
|
except:
|
|
xmlname = name
|
|
## xmlname = name.lower()
|
|
for seqitem in value:
|
|
xmlMemberString += marshal(seqitem, xmlname, subElementNameSpacePrefix, nameSpaces=nameSpaces, indent=indent+increment)
|
|
else:
|
|
if (hasattr(obj, "__xmlrename__") and name in obj.__xmlrename__):
|
|
xmlname = obj.__xmlrename__[name]
|
|
else:
|
|
xmlname = name
|
|
## xmlname = name.lower()
|
|
## # skip
|
|
## if xmlname.startswith('_') and not xmlname.startswith('__'):
|
|
## xmlname = xmlname[1:]
|
|
## if (indent > 30):
|
|
## print "getting pretty deep, xmlname = ", xmlname
|
|
xmlMemberString += marshal(value, xmlname, subElementNameSpacePrefix, nameSpaces=nameSpaces, indent=indent+increment)
|
|
# if we have nested elements, add them here, otherwise close the element tag immediately.
|
|
if xmlMemberString:
|
|
xmlString += '>'
|
|
if hasattr(obj, '__xmlbody__'):
|
|
xmlString += xmlMemberString
|
|
xmlString += '</%s>%s' % (elementName, newline)
|
|
else:
|
|
xmlString += newline
|
|
xmlString += xmlMemberString
|
|
xmlString += '%s</%s>%s' % (prefix, elementName, newline)
|
|
else:
|
|
xmlString = xmlString + '/>%s' % newline
|
|
return xmlString
|
|
|
|
# We don't use this anymore but in case we want to get properties this is how
|
|
# you do it
|
|
def hasPropertyValue(obj, attr):
|
|
hasProp = False
|
|
try:
|
|
prop = obj.__class__.__dict__[attr]
|
|
if (isinstance(prop, property)):
|
|
hasProp = hasattr(obj, attr)
|
|
if (hasProp):
|
|
# It's a property and it has a value but sometimes we don't want it.
|
|
# If there is a _hasattr method execute it and the
|
|
# result will tell us whether to include this value
|
|
try:
|
|
hasProp = obj._hasattr(attr)
|
|
except:
|
|
pass
|
|
except KeyError:
|
|
pass
|
|
return hasProp
|
|
|
|
if __name__ == '__main__':
|
|
from xmlmarshallertests import Person, marshalledint, marshalledlist
|
|
|
|
l = [1, 2, 3]
|
|
d = {'1': 1, '2': 2}
|
|
outerlist = [l]
|
|
xmlstr = marshal(d, "d", prettyPrint=True)
|
|
print xmlstr
|
|
|
|
person = Person()
|
|
person.firstName = "Albert"
|
|
person.lastName = "Camus"
|
|
person.addressLine1 = "23 Absurd St."
|
|
person.city = "Ennui"
|
|
person.state = "MO"
|
|
person.zip = "54321"
|
|
person._phoneNumber = "808-303-2323"
|
|
person.favoriteWords = ['angst', 'ennui', 'existence']
|
|
person.weight = 150
|
|
|
|
xmlstring = marshal(person, 'person', prettyPrint=True)
|
|
print xmlstring
|
|
|
|
obj = unmarshal(marshalledlist)
|
|
print "obj has type %s and value %s" % (type(obj), str(obj))
|
|
for item in obj:
|
|
print "item: %s" % str(item)
|