XmlExporter.write_xml() - Code Metrics - Inspection of "short empty elements. This complies with uamodelle..." - FreeOpcUa/python-opcua - Measure and Improve Code Quality continuously with Scrutinizer

Completed

Push — master ( 3728c0...8941cc )

by Olivier

created 2016-10-09 09:22 UTC

XmlExporter.write_xml() A

↳ Parent: XmlExporter

Complexity

Conditions

Size

Total Lines

Duplication

Lines	0
Ratio	0 %

Importance

Changes	5
Bugs	1	Features	2

Metric	Value
cc	2
c	5
b	1
f	2
dl	0
loc	22
rs	9.2

"""
from a list of nodes in the address space, build an XML file
format is the one from opc-ua specification
"""
import logging
from collections import OrderedDict
import xml.etree.ElementTree as Et

from opcua import ua
from opcua.ua import object_ids as o_ids


class XmlExporter(object):

    def __init__(self, server):
        self.logger = logging.getLogger(__name__)
        self.server = server
        self.aliases = {}

        node_set_attributes = OrderedDict()
        node_set_attributes['xmlns:xsi'] = 'http://www.w3.org/2001/XMLSchema-instance'
        node_set_attributes['xmlns:uax'] = 'http://opcfoundation.org/UA/2008/02/Types.xsd'
        node_set_attributes['xmlns:xsd'] = 'http://www.w3.org/2001/XMLSchema'
        node_set_attributes['xmlns'] = 'http://opcfoundation.org/UA/2011/03/UANodeSet.xsd'

        self.etree = Et.ElementTree(Et.Element('UANodeSet', node_set_attributes))

    def build_etree(self, node_list, uris=None):
        """
        Create an XML etree object from a list of nodes; custom namespace uris are optional
        Args:
            node_list: list of Node objects for export
            uris: list of namespace uri strings

        Returns:
        """
        self.logger.info('Building XML etree')

        # add all nodes in the list to the XML etree
        for node in node_list:
            self.node_to_etree(node)

        # add aliases to the XML etree
        self._add_alias_els()

        if uris:
            # add namespace uris to the XML etree
            self._add_namespace_uri_els(uris)

    def write_xml(self, xmlpath, pretty=True):
        """
        Write the XML etree in the exporter object to a file
        Args:
            xmlpath: string representing the path/file name

        Returns:
        """
        # try to write the XML etree to a file
        self.logger.info('Exporting XML file to %s', xmlpath)
        #from IPython import embed
        # embed()
        if pretty:
            indent(self.etree.getroot())
            self.etree.write(xmlpath,
                             encoding='utf-8',
                             xml_declaration=True
                             )
        else:
            self.etree.write(xmlpath,
                             encoding='utf-8',
                             xml_declaration=True
                             )

    def dump_etree(self):
        """
        Dump etree to console for debugging
        Returns:
        """
        self.logger.info('Dumping XML etree to console')
        Et.dump(self.etree)

    def node_to_etree(self, node):
        """
        Add the necessary XML sub elements to the etree for exporting the node
        Args:
            node: Node object which will be added to XML etree

        Returns:
        """
        node_class = node.get_node_class()
        print("Exporting: ", node)

        if node_class is ua.NodeClass.Object:
            self.add_etree_object(node)
        elif node_class is ua.NodeClass.ObjectType:
            self.add_etree_object_type(node)
        elif node_class is ua.NodeClass.Variable:
            self.add_etree_variable(node)
        elif node_class is ua.NodeClass.VariableType:
            self.add_etree_variable_type(node)
        elif node_class is ua.NodeClass.ReferenceType:
            self.add_etree_reference_type(node)
        elif node_class is ua.NodeClass.DataType:
            self.add_etree_datatype(node)
        elif node_class is ua.NodeClass.Method:
            self.add_etree_method(node)
        else:
            self.logger.info("Exporting node class not implemented: %s ", node_class)

    def _add_sub_el(self, el, name, text):
        child_el = Et.SubElement(el, name)
        child_el.text = text
        return child_el

    def _add_node_common(self, nodetype, node):
        browsename = node.get_browse_name().to_string()
        nodeid = node.nodeid.to_string()
        parent = node.get_parent()
        displayname = node.get_display_name().Text.decode('utf-8')
        desc = node.get_description().Text
        print("NODE COMMON", node)
        node_el = Et.SubElement(self.etree.getroot(), nodetype)
        node_el.attrib["NodeId"] = nodeid
        node_el.attrib["BrowseName"] = browsename
        if parent is not None:
            node_class = node.get_node_class()
            if node_class in (ua.NodeClass.Object, ua.NodeClass.Variable, ua.NodeClass.Method):
                node_el.attrib["ParentNodeId"] = parent.nodeid.to_string()
        self._add_sub_el(node_el, 'DisplayName', displayname)
        if desc not in (None, ""):
            self._add_sub_el(node_el, 'Description', desc.decode('utf-8'))
        # FIXME: add WriteMask and UserWriteMask
        return node_el

    def add_etree_object(self, node):
        """
        Add a UA object element to the XML etree
        """
        obj_el = self._add_node_common("UAObject", node)
        var = node.get_attribute(ua.AttributeIds.EventNotifier)
        if var.Value.Value != 0:
            obj_el.attrib["EventNotifier"] = str(var.Value.Value)
        self._add_ref_els(obj_el, node)

    def add_etree_object_type(self, node):
        """
        Add a UA object type element to the XML etree
        """
        obj_el = self._add_node_common("UAObjectType", node)
        abstract = node.get_attribute(ua.AttributeIds.IsAbstract).Value.Value
        if abstract:
            obj_el.attrib["IsAbstract"] = 'true'
        self._add_ref_els(obj_el, node)

    def add_variable_common(self, node, el):
        dtype = node.get_data_type()
        if dtype.Identifier in o_ids.ObjectIdNames:
            dtype_name = o_ids.ObjectIdNames[dtype.Identifier]
            self.aliases[dtype_name] = dtype.to_string()
        else:
            dtype_name = dtype.to_string()
        rank = node.get_value_rank()
        if rank != -1:
            el.attrib["ValueRank"] = str(rank)
        #var = node.get_attribute(ua.AttributeIds.ArrayDimensions())
        #self._addobj_el.attrib["ArrayDimensions"] = str(var.Value.Value)
        el.attrib["DataType"] = dtype_name
        value_to_etree(el, dtype_name, dtype, node)

    def add_etree_variable(self, node):
        """
        Add a UA variable element to the XML etree
        """
        var_el = self._add_node_common("UAVariable", node)
        self.add_variable_common(node, var_el)

        accesslevel = node.get_attribute(ua.AttributeIds.AccessLevel).Value.Value
        useraccesslevel = node.get_attribute(ua.AttributeIds.UserAccessLevel).Value.Value

        # We only write these values if they are different from defaults
        # Not sure where default is defined....
        if accesslevel not in (0, ua.AccessLevel.CurrentRead.mask):
            var_el.attrib["AccessLevel"] = str(accesslevel)
        if useraccesslevel not in (0, ua.AccessLevel.CurrentRead.mask):
            var_el.attrib["UserAccessLevel"] = str(useraccesslevel)

        var = node.get_attribute(ua.AttributeIds.MinimumSamplingInterval)
        if var.Value.Value:
            var_el.attrib["MinimumSamplingInterval"] = str(var.Value.Value)
        var = node.get_attribute(ua.AttributeIds.Historizing)
        if var.Value.Value:
            var_el.attrib["Historizing"] = 'true'
        self._add_ref_els(var_el, node)

    def add_etree_variable_type(self, node):
        """
        Add a UA variable type element to the XML etree
        """

        var_el = self._add_node_common("UAVariableType", node)
        self.add_variable_common(node, var_el)

        abstract = node.get_attribute(ua.AttributeIds.IsAbstract)
        if abstract.Value.Value:
            var_el.attrib["IsAbstract"] = "true"

        self._add_ref_els(var_el, node)

    def add_etree_method(self, node):
        obj_el = self._add_node_common("UAMethod", node)

        var = node.get_attribute(ua.AttributeIds.Executable)
        if var.Value.Value is False:
            obj_el.attrib["Executable"] = "false"
        var = node.get_attribute(ua.AttributeIds.UserExecutable)
        if var.Value.Value is False:
            obj_el.attrib["UserExecutable"] = "false"
        self._add_ref_els(obj_el, node)

    def add_etree_reference_type(self, obj):
        obj_el = self._add_node_common("UAReferenceType", obj)
        var = obj.get_attribute(ua.AttributeIds.InverseName)
        if var is not None and var.Value.Value is not None:
            self._add_sub_el(obj_el, 'InverseName', var.Value.Value.Text.decode('utf-8'))
        self._add_ref_els(obj_el, obj)

    def add_etree_datatype(self, obj):
        """
        Add a UA data type element to the XML etree
        """
        obj_el = self._add_node_common("UADataType", obj)
        self._add_ref_els(obj_el, obj)

    def _add_namespace_uri_els(self, uris):
        nuris_el = Et.Element('NamespaceUris')

        for uri in uris:
            self._add_sub_el(nuris_el, 'Uri', uri)

        self.etree.getroot().insert(0, nuris_el)

    def _add_alias_els(self):
        aliases_el = Et.Element('Aliases')

        for k, v in self.aliases.items():
            ref_el = Et.SubElement(aliases_el, 'Alias', Alias=k)
            ref_el.text = v

        self.etree.getroot().insert(0, aliases_el)

    def _add_ref_els(self, parent_el, obj):
        refs = obj.get_references()
        refs_el = Et.SubElement(parent_el, 'References')

        for ref in refs:
            if ref.ReferenceTypeId.Identifier in o_ids.ObjectIdNames:
                ref_name = o_ids.ObjectIdNames[ref.ReferenceTypeId.Identifier]
            else:
                ref_name = ref.ReferenceTypeId.to_string()
            ref_el = Et.SubElement(refs_el, 'Reference')
            ref_el.attrib['ReferenceType'] = ref_name
            if not ref.IsForward:
                ref_el.attrib['IsForward'] = 'false'
            ref_el.text = ref.NodeId.to_string()

            self.aliases[ref_name] = ref.ReferenceTypeId.to_string()


def member_to_etree(el, name, dtype, val):
    member_el = Et.SubElement(el, "uax:" + name)
    if isinstance(val, (list, tuple)):
        for v in val:
            _value_to_etree(member_el, ua.ObjectIdNames[dtype.Identifier], dtype, v)
    else:
        _val_to_etree(member_el, dtype, val)


def _val_to_etree(el, dtype, val):
    if val is None:
        val = ""
    if dtype == ua.NodeId(ua.ObjectIds.NodeId):
        id_el = Et.SubElement(el, "uax:Identifier")
        id_el.text = val.to_string()
    elif not hasattr(val, "ua_types"):
        el.text = str(val)
    else:
        for name, vtype in val.ua_types.items():
            member_to_etree(el, name, ua.NodeId(getattr(ua.ObjectIds, vtype)), getattr(val, name))


def value_to_etree(el, dtype_name, dtype, node):
    var = node.get_data_value().Value
    if var.Value is not None:
        val_el = Et.SubElement(el, 'Value')
        _value_to_etree(val_el, dtype_name, dtype, var.Value)


def _value_to_etree(el, type_name, dtype, val):
    if not val:
        return
    if isinstance(val, (list, tuple)):
        if dtype.Identifier > 21:  # this is an extentionObject:
            elname = "uax:ListOfExtensionObject"
        else:
            elname = "uax:ListOf" + type_name
        list_el = Et.SubElement(el, elname)
        for nval in val:
            _value_to_etree(list_el, type_name, dtype, nval)
    else:
        if dtype.Identifier > 21:  # this is an extentionObject:
            _extobj_to_etree(el, type_name, dtype, val)
        else:
            val_el = Et.SubElement(el, "uax:" + type_name)
            _val_to_etree(val_el, dtype, val)
           

def _extobj_to_etree(val_el, name, dtype, val):
    obj_el = Et.SubElement(val_el, "uax:ExtensionObject")
    type_el = Et.SubElement(obj_el, "uax:TypeId")
    id_el = Et.SubElement(type_el, "uax:Identifier")
    id_el.text = dtype.to_string()
    body_el = Et.SubElement(obj_el, "uax:Body")
    struct_el = Et.SubElement(body_el, "uax:" + name)
    for name, vtype in val.ua_types.items():
        member_to_etree(struct_el, name, ua.NodeId(getattr(ua.ObjectIds, vtype)), getattr(val, name))


def indent(elem, level=0):
    '''
    copy and paste from http://effbot.org/zone/element-lib.htm#prettyprint
    it basically walks your tree and adds spaces and newlines so the tree is
    printed in a nice way
    '''
    i = "\n" + level * "  "
    if len(elem):
        if not elem.text or not elem.text.strip():
            elem.text = i + "  "
        if not elem.tail or not elem.tail.strip():
            elem.tail = i
        for elem in elem:
            indent(elem, level + 1)
        if not elem.tail or not elem.tail.strip():
            elem.tail = i
    else:
        if level and (not elem.tail or not elem.tail.strip()):
            elem.tail = i


1			"""
2			from a list of nodes in the address space, build an XML file
3			format is the one from opc-ua specification
4			"""
5			import logging
6			from collections import OrderedDict
7			import xml.etree.ElementTree as Et
8
9			from opcua import ua
10			from opcua.ua import object_ids as o_ids
11
12
13			class XmlExporter(object):
14
15			def __init__(self, server):
16			self.logger = logging.getLogger(__name__)
17			self.server = server
18			self.aliases = {}
19
20			node_set_attributes = OrderedDict()
21			node_set_attributes['xmlns:xsi'] = 'http://www.w3.org/2001/XMLSchema-instance'
22			node_set_attributes['xmlns:uax'] = 'http://opcfoundation.org/UA/2008/02/Types.xsd'
23			node_set_attributes['xmlns:xsd'] = 'http://www.w3.org/2001/XMLSchema'
24			node_set_attributes['xmlns'] = 'http://opcfoundation.org/UA/2011/03/UANodeSet.xsd'
25
26			self.etree = Et.ElementTree(Et.Element('UANodeSet', node_set_attributes))
27
28			def build_etree(self, node_list, uris=None):
29			"""
30			Create an XML etree object from a list of nodes; custom namespace uris are optional
31			Args:
32			node_list: list of Node objects for export
33			uris: list of namespace uri strings
34
35			Returns:
36			"""
37			self.logger.info('Building XML etree')
38
39			# add all nodes in the list to the XML etree
40			for node in node_list:
41			self.node_to_etree(node)
42
43			# add aliases to the XML etree
44			self._add_alias_els()
45
46			if uris:
47			# add namespace uris to the XML etree
48			self._add_namespace_uri_els(uris)
49
50			def write_xml(self, xmlpath, pretty=True):
51			"""
52			Write the XML etree in the exporter object to a file
53			Args:
54			xmlpath: string representing the path/file name
55
56			Returns:
57			"""
58			# try to write the XML etree to a file
59			self.logger.info('Exporting XML file to %s', xmlpath)
60			#from IPython import embed
61			# embed()
62			if pretty:
63			indent(self.etree.getroot())
64			self.etree.write(xmlpath,
65			encoding='utf-8',
66			xml_declaration=True
67			)
68			else:
69			self.etree.write(xmlpath,
70			encoding='utf-8',
71			xml_declaration=True
72			)
73
74			def dump_etree(self):
75			"""
76			Dump etree to console for debugging
77			Returns:
78			"""
79			self.logger.info('Dumping XML etree to console')
80			Et.dump(self.etree)
81
82			def node_to_etree(self, node):
83			"""
84			Add the necessary XML sub elements to the etree for exporting the node
85			Args:
86			node: Node object which will be added to XML etree
87
88			Returns:
89			"""
90			node_class = node.get_node_class()
91			print("Exporting: ", node)
92
93			if node_class is ua.NodeClass.Object:
94			self.add_etree_object(node)
95			elif node_class is ua.NodeClass.ObjectType:
96			self.add_etree_object_type(node)
97			elif node_class is ua.NodeClass.Variable:
98			self.add_etree_variable(node)
99			elif node_class is ua.NodeClass.VariableType:
100			self.add_etree_variable_type(node)
101			elif node_class is ua.NodeClass.ReferenceType:
102			self.add_etree_reference_type(node)
103			elif node_class is ua.NodeClass.DataType:
104			self.add_etree_datatype(node)
105			elif node_class is ua.NodeClass.Method:
106			self.add_etree_method(node)
107			else:
108			self.logger.info("Exporting node class not implemented: %s ", node_class)
109
110			def _add_sub_el(self, el, name, text):
111			child_el = Et.SubElement(el, name)
112			child_el.text = text
113			return child_el
114
115			def _add_node_common(self, nodetype, node):
116			browsename = node.get_browse_name().to_string()
117			nodeid = node.nodeid.to_string()
118			parent = node.get_parent()
119			displayname = node.get_display_name().Text.decode('utf-8')
120			desc = node.get_description().Text
121			print("NODE COMMON", node)
122			node_el = Et.SubElement(self.etree.getroot(), nodetype)
123			node_el.attrib["NodeId"] = nodeid
124			node_el.attrib["BrowseName"] = browsename
125			if parent is not None:
126			node_class = node.get_node_class()
127			if node_class in (ua.NodeClass.Object, ua.NodeClass.Variable, ua.NodeClass.Method):
128			node_el.attrib["ParentNodeId"] = parent.nodeid.to_string()
129			self._add_sub_el(node_el, 'DisplayName', displayname)
130			if desc not in (None, ""):
131			self._add_sub_el(node_el, 'Description', desc.decode('utf-8'))
132			# FIXME: add WriteMask and UserWriteMask
133			return node_el
134
135			def add_etree_object(self, node):
136			"""
137			Add a UA object element to the XML etree
138			"""
139			obj_el = self._add_node_common("UAObject", node)
140			var = node.get_attribute(ua.AttributeIds.EventNotifier)
141			if var.Value.Value != 0:
142			obj_el.attrib["EventNotifier"] = str(var.Value.Value)
143			self._add_ref_els(obj_el, node)
144
145			def add_etree_object_type(self, node):
146			"""
147			Add a UA object type element to the XML etree
148			"""
149			obj_el = self._add_node_common("UAObjectType", node)
150			abstract = node.get_attribute(ua.AttributeIds.IsAbstract).Value.Value
151			if abstract:
152			obj_el.attrib["IsAbstract"] = 'true'
153			self._add_ref_els(obj_el, node)
154
155			def add_variable_common(self, node, el):
156			dtype = node.get_data_type()
157			if dtype.Identifier in o_ids.ObjectIdNames:
158			dtype_name = o_ids.ObjectIdNames[dtype.Identifier]
159			self.aliases[dtype_name] = dtype.to_string()
160			else:
161			dtype_name = dtype.to_string()
162			rank = node.get_value_rank()
163			if rank != -1:
164			el.attrib["ValueRank"] = str(rank)
165			#var = node.get_attribute(ua.AttributeIds.ArrayDimensions())
166			#self._addobj_el.attrib["ArrayDimensions"] = str(var.Value.Value)
167			el.attrib["DataType"] = dtype_name
168			value_to_etree(el, dtype_name, dtype, node)
169
170			def add_etree_variable(self, node):
171			"""
172			Add a UA variable element to the XML etree
173			"""
174			var_el = self._add_node_common("UAVariable", node)
175			self.add_variable_common(node, var_el)
176
177			accesslevel = node.get_attribute(ua.AttributeIds.AccessLevel).Value.Value
178			useraccesslevel = node.get_attribute(ua.AttributeIds.UserAccessLevel).Value.Value
179
180			# We only write these values if they are different from defaults
181			# Not sure where default is defined....
182			if accesslevel not in (0, ua.AccessLevel.CurrentRead.mask):
183			var_el.attrib["AccessLevel"] = str(accesslevel)
184			if useraccesslevel not in (0, ua.AccessLevel.CurrentRead.mask):
185			var_el.attrib["UserAccessLevel"] = str(useraccesslevel)
186
187			var = node.get_attribute(ua.AttributeIds.MinimumSamplingInterval)
188			if var.Value.Value:
189			var_el.attrib["MinimumSamplingInterval"] = str(var.Value.Value)
190			var = node.get_attribute(ua.AttributeIds.Historizing)
191			if var.Value.Value:
192			var_el.attrib["Historizing"] = 'true'
193			self._add_ref_els(var_el, node)
194
195			def add_etree_variable_type(self, node):
196			"""
197			Add a UA variable type element to the XML etree
198			"""
199
200			var_el = self._add_node_common("UAVariableType", node)
201			self.add_variable_common(node, var_el)
202
203			abstract = node.get_attribute(ua.AttributeIds.IsAbstract)
204			if abstract.Value.Value:
205			var_el.attrib["IsAbstract"] = "true"
206
207			self._add_ref_els(var_el, node)
208
209			def add_etree_method(self, node):
210			obj_el = self._add_node_common("UAMethod", node)
211
212			var = node.get_attribute(ua.AttributeIds.Executable)
213			if var.Value.Value is False:
214			obj_el.attrib["Executable"] = "false"
215			var = node.get_attribute(ua.AttributeIds.UserExecutable)
216			if var.Value.Value is False:
217			obj_el.attrib["UserExecutable"] = "false"
218			self._add_ref_els(obj_el, node)
219
220			def add_etree_reference_type(self, obj):
221			obj_el = self._add_node_common("UAReferenceType", obj)
222			var = obj.get_attribute(ua.AttributeIds.InverseName)
223			if var is not None and var.Value.Value is not None:
224			self._add_sub_el(obj_el, 'InverseName', var.Value.Value.Text.decode('utf-8'))
225			self._add_ref_els(obj_el, obj)
226
227			def add_etree_datatype(self, obj):
228			"""
229			Add a UA data type element to the XML etree
230			"""
231			obj_el = self._add_node_common("UADataType", obj)
232			self._add_ref_els(obj_el, obj)
233
234			def _add_namespace_uri_els(self, uris):
235			nuris_el = Et.Element('NamespaceUris')
236
237			for uri in uris:
238			self._add_sub_el(nuris_el, 'Uri', uri)
239
240			self.etree.getroot().insert(0, nuris_el)
241
242			def _add_alias_els(self):
243			aliases_el = Et.Element('Aliases')
244
245			for k, v in self.aliases.items():
246			ref_el = Et.SubElement(aliases_el, 'Alias', Alias=k)
247			ref_el.text = v
248
249			self.etree.getroot().insert(0, aliases_el)
250
251			def _add_ref_els(self, parent_el, obj):
252			refs = obj.get_references()
253			refs_el = Et.SubElement(parent_el, 'References')
254
255			for ref in refs:
256			if ref.ReferenceTypeId.Identifier in o_ids.ObjectIdNames:
257			ref_name = o_ids.ObjectIdNames[ref.ReferenceTypeId.Identifier]
258			else:
259			ref_name = ref.ReferenceTypeId.to_string()
260			ref_el = Et.SubElement(refs_el, 'Reference')
261			ref_el.attrib['ReferenceType'] = ref_name
262			if not ref.IsForward:
263			ref_el.attrib['IsForward'] = 'false'
264			ref_el.text = ref.NodeId.to_string()
265
266			self.aliases[ref_name] = ref.ReferenceTypeId.to_string()
267
268
269			def member_to_etree(el, name, dtype, val):
270			member_el = Et.SubElement(el, "uax:" + name)
271			if isinstance(val, (list, tuple)):
272			for v in val:
273			_value_to_etree(member_el, ua.ObjectIdNames[dtype.Identifier], dtype, v)
274			else:
275			_val_to_etree(member_el, dtype, val)
276
277
278			def _val_to_etree(el, dtype, val):
279			if val is None:
280			val = ""
281			if dtype == ua.NodeId(ua.ObjectIds.NodeId):
282			id_el = Et.SubElement(el, "uax:Identifier")
283			id_el.text = val.to_string()
284			elif not hasattr(val, "ua_types"):
285			el.text = str(val)
286			else:
287			for name, vtype in val.ua_types.items():
288			member_to_etree(el, name, ua.NodeId(getattr(ua.ObjectIds, vtype)), getattr(val, name))
289
290
291			def value_to_etree(el, dtype_name, dtype, node):
292			var = node.get_data_value().Value
293			if var.Value is not None:
294			val_el = Et.SubElement(el, 'Value')
295			_value_to_etree(val_el, dtype_name, dtype, var.Value)
296
297
298			def _value_to_etree(el, type_name, dtype, val):
299			if not val:
300			return
301			if isinstance(val, (list, tuple)):
302			if dtype.Identifier > 21: # this is an extentionObject:
303			elname = "uax:ListOfExtensionObject"
304			else:
305			elname = "uax:ListOf" + type_name
306			list_el = Et.SubElement(el, elname)
307			for nval in val:
308			_value_to_etree(list_el, type_name, dtype, nval)
309			else:
310			if dtype.Identifier > 21: # this is an extentionObject:
311			_extobj_to_etree(el, type_name, dtype, val)
312			else:
313			val_el = Et.SubElement(el, "uax:" + type_name)
314			_val_to_etree(val_el, dtype, val)
315
316
317			def _extobj_to_etree(val_el, name, dtype, val):
318			obj_el = Et.SubElement(val_el, "uax:ExtensionObject")
319			type_el = Et.SubElement(obj_el, "uax:TypeId")
320			id_el = Et.SubElement(type_el, "uax:Identifier")
321			id_el.text = dtype.to_string()
322			body_el = Et.SubElement(obj_el, "uax:Body")
323			struct_el = Et.SubElement(body_el, "uax:" + name)
324			for name, vtype in val.ua_types.items():
325			member_to_etree(struct_el, name, ua.NodeId(getattr(ua.ObjectIds, vtype)), getattr(val, name))
326
327
328			def indent(elem, level=0):
329			'''
330			copy and paste from http://effbot.org/zone/element-lib.htm#prettyprint
331			it basically walks your tree and adds spaces and newlines so the tree is
332			printed in a nice way
333			'''
334			i = "\n" + level * " "
335			if len(elem):
336			if not elem.text or not elem.text.strip():
337			elem.text = i + " "
338			if not elem.tail or not elem.tail.strip():
339			elem.tail = i
340			for elem in elem:
341			indent(elem, level + 1)
342			if not elem.tail or not elem.tail.strip():
343			elem.tail = i
344			else:
345			if level and (not elem.tail or not elem.tail.strip()):
346			elem.tail = i
347

FreeOpcUa / python-opcua

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XmlExporter.write_xml() A

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