Thuban/Model/load.py

# Copyright (C) 2001, 2002, 2003 by Intevation GmbH
# Authors:
# Jan-Oliver Wagner <[email protected]>
# Bernhard Herzog <[email protected]>
# Jonathan Coles <[email protected]>
#
# This program is free software under the GPL (>=v2)
# Read the file COPYING coming with GRASS for details.

"""
Parser for thuban session files.
"""

__version__ = "$Revision$"

import string, os

import xml.sax
import xml.sax.handler
from xml.sax import make_parser, ErrorHandler, SAXNotRecognizedException

from Thuban import _

from Thuban.Model.table import FIELDTYPE_INT, FIELDTYPE_DOUBLE, \
     FIELDTYPE_STRING

from Thuban.Model.session import Session
from Thuban.Model.map import Map
from Thuban.Model.layer import Layer
from Thuban.Model.color import Color
from Thuban.Model.proj import Projection
from Thuban.Model.classification import Classification, \
    ClassGroupDefault, ClassGroupSingleton, ClassGroupRange, ClassGroupMap, \
    ClassGroupProperties


def parse_color(color):
    """Return the color object for the string color.

    Color may be either 'None' or of the form '#RRGGBB' in the usual
    HTML color notation
    """
    color = string.strip(color)
    if color == "None":
        result = Color.Transparent
    elif color[0] == '#':
        if len(color) == 7:
            r = string.atoi(color[1:3], 16) / 255.0
            g = string.atoi(color[3:5], 16) / 255.0
            b = string.atoi(color[5:7], 16) / 255.0
            result = Color(r, g, b)
        else:
            raise ValueError(_("Invalid hexadecimal color specification %s")
                             % color)
    else:
        raise ValueError(_("Invalid color specification %s") % color)
    return result


class XMLReader(xml.sax.handler.ContentHandler):

    # Dictionary mapping element names (or (URI, element name) pairs for
    # documents using namespaces) to method names. The methods should
    # accept the same parameters as the startElement (or startElementNS)
    # methods. The start_dispatcher is used by the default startElement
    # and startElementNS methods to call a method for the open tag of an
    # element.
    start_dispatcher = {}

    # end_dispatcher works just like start_dispatcher but it's used by
    # endElement and endElementNS. The method whose names it maps to
    # should accept the same parameters as endElement and endElementNS.
    end_dispatcher = {}


    def __init__(self):
        self.chars = ''
        self.__directory = ""
        self.__dispatchers = {}

    def read(self, file_or_filename):

        if hasattr(file_or_filename, "read"):
            # it's a file object
            self.__directory = ""
            self.__file = file_or_filename
        else:
            filename = file_or_filename
            self.__directory = os.path.dirname(filename)
            self.__file = open(filename)

        parser = make_parser()
        parser.setContentHandler(self)
        parser.setErrorHandler(ErrorHandler())
        parser.setFeature(xml.sax.handler.feature_namespaces, 1)

        #
        # Well, this isn't pretty, but it appears that if you
        # use Python 2.2 without the site-package _xmlplus then
        # the following will fail, and without them it will work.
        # However, if you do have the site-package and you don't
        # call these functions, the reader raises an exception
        #
        # The reason we set these to 0 in the first place is 
        # because there is an unresolved issue with external
        # entities causing an exception in the reader
        #
        try:
            parser.setFeature(xml.sax.handler.feature_validation,0)
            parser.setFeature(xml.sax.handler.feature_external_ges,0)
            parser.setFeature(xml.sax.handler.feature_external_pes,0)
        except SAXNotRecognizedException:
            pass

        parser.parse(self.__file)

        self.close()

    def close(self):
        self.__file.close()
        
    def GetFilename(self):
        if hasattr(self.__file, "name"):
            return self.__file.name

        return ""

    def GetDirectory(self):
        return self.__directory


    def AddDispatchers(self, dict):
        """Add the function names that should be used to process XML tags.

        dict -- a dictionary whose keys are XML tag strings and whose values
                are pairs of strings such that the first string is
                the name of the function that should be called when the
                XML tag opens and the second string is the name of the
                function that should be called when the XML tag closes.
                If a pair element is None, no function is called.
        """

        self.__dispatchers.update(dict)

    def startElementNS(self, name, qname, attrs):
        """Call the method given for name in self.start_dispatcher
        """
        if name[0] is None:
            method_name = self.__dispatchers.get(name[1])
        else:
            # Dispatch with namespace
            method_name = self.__dispatchers.get(name)
        if method_name is not None and method_name[0] is not None:
            getattr(self, method_name[0])(name, qname, attrs)

    def endElementNS(self, name, qname):
        """Call the method given for name in self.end_dispatcher
        """
        if name[0] is None:
            method_name = self.__dispatchers.get(name[1])
        else:
            # Dispatch with namespace
            method_name = self.__dispatchers.get(name)
        if method_name is not None and method_name[1] is not None:
            getattr(self, method_name[1])(name, qname)

class SessionLoader(XMLReader):

    def __init__(self):
        """Inititialize the Sax handler."""
        XMLReader.__init__(self)

        self.theSession = None
        self.aMap = None
        self.aLayer = None

        XMLReader.AddDispatchers(self,
            {'session'       : ("start_session",        "end_session"),
             'map'           : ("start_map",            "end_map"),
             'projection'    : ("start_projection",     "end_projection"),
             'parameter'     : ("start_parameter",      None),
             'layer'         : ("start_layer",          "end_layer"),
             'classification': ("start_classification", "end_classification"),
             'clnull'        : ("start_clnull",         "end_clnull"),
             'clpoint'       : ("start_clpoint",        "end_clpoint"),
             'clrange'       : ("start_clrange",        "end_clrange"),
             'cldata'        : ("start_cldata",         "end_cldata"),
             'table'         : ("start_table",          "end_table"),
             'labellayer'    : ("start_labellayer",     None),
             'label'         : ("start_label",          None)})

    def start_session(self, name, qname, attrs):
        self.theSession = Session(attrs.get((None, 'title'), None))

    def end_session(self, name, qname):
        pass

    def start_map(self, name, qname, attrs):
        """Start a map."""
        self.aMap = Map(attrs.get((None, 'title'), None))
        self.__projReceiver = self.aMap

    def end_map(self, name, qname):
        self.theSession.AddMap(self.aMap)
        self.__projReceiver = None

    def start_projection(self, name, qname, attrs):
        self.ProjectionName = attrs.get((None, 'name'), None)
        self.ProjectionParams = [ ]

    def end_projection(self, name, qname):
        self.__projReceiver.SetProjection(
            Projection(self.ProjectionParams, self.ProjectionName))

    def start_parameter(self, name, qname, attrs):
        s = attrs.get((None, 'value'))
        s = str(s) # we can't handle unicode in proj
        self.ProjectionParams.append(s)

    def start_layer(self, name, qname, attrs, layer_class = Layer):
        """Start a layer

        Instantiate a layer of class layer_class from the attributes in
        attrs which may be a dictionary as well as the normal SAX attrs
        object and bind it to self.aLayer.
        """
        title = attrs.get((None, 'title'), "")
        filename = attrs.get((None, 'filename'), "")
        filename = os.path.join(self.GetDirectory(), filename)
        visible  = attrs.get((None, 'visible'), "true")
        fill = parse_color(attrs.get((None, 'fill'), "None"))
        stroke = parse_color(attrs.get((None, 'stroke'), "#000000"))
        stroke_width = int(attrs.get((None, 'stroke_width'), "1"))
        self.aLayer = layer_class(title,
                                  self.theSession.OpenShapefile(filename),
                                  fill = fill, stroke = stroke,
                                  lineWidth = stroke_width,
                                  visible = visible != "false")

        self.__projReceiver = self.aLayer

    def end_layer(self, name, qname):
        self.aMap.AddLayer(self.aLayer)
        self.__projReceiver = None

    def start_classification(self, name, qname, attrs):
        field = attrs.get((None, 'field'), None)

        fieldType = attrs.get((None, 'field_type'), None)
        dbFieldType = self.aLayer.GetFieldType(field)

        if fieldType != dbFieldType:
            raise ValueError(_("xml field type differs from database!"))

        # setup conversion routines depending on the kind of data
        # we will be seeing later on
        if fieldType == FIELDTYPE_STRING:
            self.conv = str
        elif fieldType == FIELDTYPE_INT:
            self.conv = lambda p: int(float(p))
        elif fieldType == FIELDTYPE_DOUBLE:
            self.conv = float

        self.aLayer.GetClassification().SetField(field)


    def end_classification(self, name, qname): 
        pass

    def start_clnull(self, name, qname, attrs):
        self.cl_group = ClassGroupDefault()
        self.cl_group.SetLabel(attrs.get((None, 'label'), ""))
        self.cl_prop = ClassGroupProperties()

    def end_clnull(self, name, qname):
        self.cl_group.SetProperties(self.cl_prop)
        self.aLayer.GetClassification().SetDefaultGroup(self.cl_group)
        del self.cl_group, self.cl_prop

    def start_clpoint(self, name, qname, attrs):
        attrib_value = attrs.get((None, 'value'), "0")

        value = self.conv(attrib_value)

        self.cl_group = ClassGroupSingleton(value)
        self.cl_group.SetLabel(attrs.get((None, 'label'), ""))
        self.cl_prop = ClassGroupProperties()


    def end_clpoint(self, name, qname):
        self.cl_group.SetProperties(self.cl_prop)
        self.aLayer.GetClassification().AppendGroup(self.cl_group)
        del self.cl_group, self.cl_prop

    def start_clrange(self, name, qname, attrs):

        try:
            min = self.conv(attrs.get((None, 'min'), "0"))
            max = self.conv(attrs.get((None, 'max'), "0"))
        except ValueError:
            raise ValueError(_("Classification range is not a number!"))

        self.cl_group = ClassGroupRange(min, max)
        self.cl_group.SetLabel(attrs.get((None, 'label'), ""))
        self.cl_prop = ClassGroupProperties()


    def end_clrange(self, name, qname):
        self.cl_group.SetProperties(self.cl_prop)
        self.aLayer.GetClassification().AppendGroup(self.cl_group)
        del self.cl_group, self.cl_prop

    def start_cldata(self, name, qname, attrs):
        self.cl_prop.SetLineColor(
            parse_color(attrs.get((None, 'stroke'), "None")))
        self.cl_prop.SetLineWidth(
            int(attrs.get((None, 'stroke_width'), "0")))
        self.cl_prop.SetFill(parse_color(attrs.get((None, 'fill'), "None")))

    def end_cldata(self, name, qname):
        pass

    def start_table(self, name, qname, attrs):
        #print "table title: %s" % attrs.get('title', None)
        pass

    def end_table(self, name, qname):
        pass

    def start_labellayer(self, name, qname, attrs):
        self.aLayer = self.aMap.LabelLayer()

    def start_label(self, name, qname, attrs):
        x = float(attrs[(None, 'x')])
        y = float(attrs[(None, 'y')])
        text = attrs[(None, 'text')]
        halign = attrs[(None, 'halign')]
        valign = attrs[(None, 'valign')]
        self.aLayer.AddLabel(x, y, text, halign = halign, valign = valign)

    def characters(self, chars):
        pass


def load_session(filename):
    """Load a Thuban session from the file object file"""

    handler = SessionLoader()
    handler.read(filename)

    session = handler.theSession
    # Newly loaded session aren't modified
    session.UnsetModified()

    return session

1	bh	723	# Copyright (C) 2001, 2002, 2003 by Intevation GmbH
2	bh	6	# Authors:
3			# Jan-Oliver Wagner <[email protected]>
4	bh	267	# Bernhard Herzog <[email protected]>
5	jonathan	413	# Jonathan Coles <[email protected]>
6	bh	6	#
7			# This program is free software under the GPL (>=v2)
8			# Read the file COPYING coming with GRASS for details.
9
10			"""
11			Parser for thuban session files.
12			"""
13
14			__version__ = "$Revision$"
15
16	bh	723	import string, os
17	bh	267
18			import xml.sax
19			import xml.sax.handler
20	jonathan	526	from xml.sax import make_parser, ErrorHandler, SAXNotRecognizedException
21	bh	267
22	jan	374	from Thuban import _
23	jonathan	413
24	jonathan	473	from Thuban.Model.table import FIELDTYPE_INT, FIELDTYPE_DOUBLE, \
25			FIELDTYPE_STRING
26
27	bh	6	from Thuban.Model.session import Session
28			from Thuban.Model.map import Map
29			from Thuban.Model.layer import Layer
30			from Thuban.Model.color import Color
31			from Thuban.Model.proj import Projection
32	jonathan	413	from Thuban.Model.classification import Classification, \
33	jonathan	439	ClassGroupDefault, ClassGroupSingleton, ClassGroupRange, ClassGroupMap, \
34			ClassGroupProperties
35	bh	6
36
37	bh	267	def parse_color(color):
38			"""Return the color object for the string color.
39	bh	6
40	bh	267	Color may be either 'None' or of the form '#RRGGBB' in the usual
41			HTML color notation
42	bh	6	"""
43			color = string.strip(color)
44			if color == "None":
45	jonathan	610	result = Color.Transparent
46	bh	6	elif color[0] == '#':
47			if len(color) == 7:
48			r = string.atoi(color[1:3], 16) / 255.0
49			g = string.atoi(color[3:5], 16) / 255.0
50			b = string.atoi(color[5:7], 16) / 255.0
51			result = Color(r, g, b)
52			else:
53	jan	374	raise ValueError(_("Invalid hexadecimal color specification %s")
54	bh	6	% color)
55			else:
56	jan	374	raise ValueError(_("Invalid color specification %s") % color)
57	bh	6	return result
58
59
60	jonathan	706	class XMLReader(xml.sax.handler.ContentHandler):
61	bh	6
62	bh	267	# Dictionary mapping element names (or (URI, element name) pairs for
63	jonathan	365	# documents using namespaces) to method names. The methods should
64	bh	267	# accept the same parameters as the startElement (or startElementNS)
65			# methods. The start_dispatcher is used by the default startElement
66			# and startElementNS methods to call a method for the open tag of an
67			# element.
68			start_dispatcher = {}
69
70			# end_dispatcher works just like start_dispatcher but it's used by
71			# endElement and endElementNS. The method whose names it maps to
72			# should accept the same parameters as endElement and endElementNS.
73			end_dispatcher = {}
74
75
76	jonathan	706	def __init__(self):
77	bh	6	self.chars = ''
78	jonathan	706	self.__directory = ""
79			self.__dispatchers = {}
80	bh	6
81	jonathan	706	def read(self, file_or_filename):
82
83	jonathan	722	if hasattr(file_or_filename, "read"):
84	jonathan	706	# it's a file object
85			self.__directory = ""
86			self.__file = file_or_filename
87			else:
88			filename = file_or_filename
89			self.__directory = os.path.dirname(filename)
90			self.__file = open(filename)
91
92	bh	763	parser = make_parser()
93			parser.setContentHandler(self)
94			parser.setErrorHandler(ErrorHandler())
95			parser.setFeature(xml.sax.handler.feature_namespaces, 1)
96	jonathan	706
97	bh	763	#
98			# Well, this isn't pretty, but it appears that if you
99			# use Python 2.2 without the site-package _xmlplus then
100			# the following will fail, and without them it will work.
101			# However, if you do have the site-package and you don't
102			# call these functions, the reader raises an exception
103			#
104			# The reason we set these to 0 in the first place is
105			# because there is an unresolved issue with external
106			# entities causing an exception in the reader
107			#
108			try:
109			parser.setFeature(xml.sax.handler.feature_validation,0)
110			parser.setFeature(xml.sax.handler.feature_external_ges,0)
111			parser.setFeature(xml.sax.handler.feature_external_pes,0)
112			except SAXNotRecognizedException:
113			pass
114	jonathan	706
115	bh	763	parser.parse(self.__file)
116	jonathan	706
117			self.close()
118
119			def close(self):
120			self.__file.close()
121
122	jonathan	737	def GetFilename(self):
123	jonathan	706	if hasattr(self.__file, "name"):
124			return self.__file.name
125
126			return ""
127
128			def GetDirectory(self):
129			return self.__directory
130
131
132			def AddDispatchers(self, dict):
133	jonathan	722	"""Add the function names that should be used to process XML tags.
134
135			dict -- a dictionary whose keys are XML tag strings and whose values
136			are pairs of strings such that the first string is
137			the name of the function that should be called when the
138			XML tag opens and the second string is the name of the
139			function that should be called when the XML tag closes.
140			If a pair element is None, no function is called.
141			"""
142
143	jonathan	706	self.__dispatchers.update(dict)
144
145	bh	267	def startElementNS(self, name, qname, attrs):
146			"""Call the method given for name in self.start_dispatcher
147			"""
148			if name[0] is None:
149	jonathan	706	method_name = self.__dispatchers.get(name[1])
150	bh	267	else:
151			# Dispatch with namespace
152	jonathan	706	method_name = self.__dispatchers.get(name)
153	jonathan	722	if method_name is not None and method_name[0] is not None:
154	jonathan	706	getattr(self, method_name[0])(name, qname, attrs)
155	bh	6
156	bh	267	def endElementNS(self, name, qname):
157			"""Call the method given for name in self.end_dispatcher
158			"""
159			if name[0] is None:
160	jonathan	706	method_name = self.__dispatchers.get(name[1])
161	bh	267	else:
162			# Dispatch with namespace
163	jonathan	706	method_name = self.__dispatchers.get(name)
164	jonathan	722	if method_name is not None and method_name[1] is not None:
165	jonathan	706	getattr(self, method_name[1])(name, qname)
166	bh	6
167	jonathan	706	class SessionLoader(XMLReader):
168	jonathan	694
169	jonathan	706	def __init__(self):
170	jonathan	694	"""Inititialize the Sax handler."""
171	jonathan	706	XMLReader.__init__(self)
172	jonathan	694
173			self.theSession = None
174			self.aMap = None
175			self.aLayer = None
176
177	jonathan	706	XMLReader.AddDispatchers(self,
178			{'session' : ("start_session", "end_session"),
179			'map' : ("start_map", "end_map"),
180			'projection' : ("start_projection", "end_projection"),
181			'parameter' : ("start_parameter", None),
182			'layer' : ("start_layer", "end_layer"),
183			'classification': ("start_classification", "end_classification"),
184			'clnull' : ("start_clnull", "end_clnull"),
185			'clpoint' : ("start_clpoint", "end_clpoint"),
186			'clrange' : ("start_clrange", "end_clrange"),
187			'cldata' : ("start_cldata", "end_cldata"),
188			'table' : ("start_table", "end_table"),
189			'labellayer' : ("start_labellayer", None),
190			'label' : ("start_label", None)})
191
192	bh	267	def start_session(self, name, qname, attrs):
193			self.theSession = Session(attrs.get((None, 'title'), None))
194	bh	6
195	bh	267	def end_session(self, name, qname):
196			pass
197	bh	6
198	bh	267	def start_map(self, name, qname, attrs):
199			"""Start a map."""
200			self.aMap = Map(attrs.get((None, 'title'), None))
201	jonathan	737	self.__projReceiver = self.aMap
202	bh	267
203			def end_map(self, name, qname):
204			self.theSession.AddMap(self.aMap)
205	jonathan	737	self.__projReceiver = None
206	bh	267
207			def start_projection(self, name, qname, attrs):
208	jonathan	744	self.ProjectionName = attrs.get((None, 'name'), None)
209	bh	267	self.ProjectionParams = [ ]
210
211			def end_projection(self, name, qname):
212	jonathan	744	self.__projReceiver.SetProjection(
213			Projection(self.ProjectionParams, self.ProjectionName))
214	bh	267
215			def start_parameter(self, name, qname, attrs):
216			s = attrs.get((None, 'value'))
217			s = str(s) # we can't handle unicode in proj
218			self.ProjectionParams.append(s)
219
220			def start_layer(self, name, qname, attrs, layer_class = Layer):
221			"""Start a layer
222
223			Instantiate a layer of class layer_class from the attributes in
224			attrs which may be a dictionary as well as the normal SAX attrs
225			object and bind it to self.aLayer.
226			"""
227			title = attrs.get((None, 'title'), "")
228			filename = attrs.get((None, 'filename'), "")
229	jonathan	694	filename = os.path.join(self.GetDirectory(), filename)
230	jonathan	772	visible = attrs.get((None, 'visible'), "true")
231	bh	267	fill = parse_color(attrs.get((None, 'fill'), "None"))
232			stroke = parse_color(attrs.get((None, 'stroke'), "#000000"))
233			stroke_width = int(attrs.get((None, 'stroke_width'), "1"))
234	bh	723	self.aLayer = layer_class(title,
235			self.theSession.OpenShapefile(filename),
236			fill = fill, stroke = stroke,
237	jonathan	772	lineWidth = stroke_width,
238			visible = visible != "false")
239	bh	267
240	jonathan	737	self.__projReceiver = self.aLayer
241
242	bh	267	def end_layer(self, name, qname):
243			self.aMap.AddLayer(self.aLayer)
244	jonathan	737	self.__projReceiver = None
245	bh	267
246	jonathan	365	def start_classification(self, name, qname, attrs):
247	jonathan	465	field = attrs.get((None, 'field'), None)
248
249			fieldType = attrs.get((None, 'field_type'), None)
250			dbFieldType = self.aLayer.GetFieldType(field)
251
252			if fieldType != dbFieldType:
253			raise ValueError(_("xml field type differs from database!"))
254
255			# setup conversion routines depending on the kind of data
256			# we will be seeing later on
257			if fieldType == FIELDTYPE_STRING:
258			self.conv = str
259			elif fieldType == FIELDTYPE_INT:
260			self.conv = lambda p: int(float(p))
261			elif fieldType == FIELDTYPE_DOUBLE:
262			self.conv = float
263
264			self.aLayer.GetClassification().SetField(field)
265
266	jonathan	365
267			def end_classification(self, name, qname):
268			pass
269
270			def start_clnull(self, name, qname, attrs):
271	jonathan	439	self.cl_group = ClassGroupDefault()
272			self.cl_group.SetLabel(attrs.get((None, 'label'), ""))
273			self.cl_prop = ClassGroupProperties()
274	jonathan	365
275			def end_clnull(self, name, qname):
276	jonathan	439	self.cl_group.SetProperties(self.cl_prop)
277			self.aLayer.GetClassification().SetDefaultGroup(self.cl_group)
278			del self.cl_group, self.cl_prop
279	jonathan	365
280			def start_clpoint(self, name, qname, attrs):
281			attrib_value = attrs.get((None, 'value'), "0")
282
283	jonathan	465	value = self.conv(attrib_value)
284
285	jonathan	439	self.cl_group = ClassGroupSingleton(value)
286			self.cl_group.SetLabel(attrs.get((None, 'label'), ""))
287			self.cl_prop = ClassGroupProperties()
288	jonathan	413
289	jonathan	365
290			def end_clpoint(self, name, qname):
291	jonathan	439	self.cl_group.SetProperties(self.cl_prop)
292	jonathan	614	self.aLayer.GetClassification().AppendGroup(self.cl_group)
293	jonathan	439	del self.cl_group, self.cl_prop
294	jonathan	365
295			def start_clrange(self, name, qname, attrs):
296
297			try:
298	jonathan	465	min = self.conv(attrs.get((None, 'min'), "0"))
299			max = self.conv(attrs.get((None, 'max'), "0"))
300	jonathan	365	except ValueError:
301	jan	374	raise ValueError(_("Classification range is not a number!"))
302	jonathan	365
303	jonathan	439	self.cl_group = ClassGroupRange(min, max)
304			self.cl_group.SetLabel(attrs.get((None, 'label'), ""))
305			self.cl_prop = ClassGroupProperties()
306	jonathan	413
307	jonathan	365
308			def end_clrange(self, name, qname):
309	jonathan	439	self.cl_group.SetProperties(self.cl_prop)
310	jonathan	614	self.aLayer.GetClassification().AppendGroup(self.cl_group)
311	jonathan	439	del self.cl_group, self.cl_prop
312	jonathan	365
313			def start_cldata(self, name, qname, attrs):
314	jonathan	465	self.cl_prop.SetLineColor(
315			parse_color(attrs.get((None, 'stroke'), "None")))
316			self.cl_prop.SetLineWidth(
317	jonathan	390	int(attrs.get((None, 'stroke_width'), "0")))
318	jonathan	439	self.cl_prop.SetFill(parse_color(attrs.get((None, 'fill'), "None")))
319	jonathan	365
320			def end_cldata(self, name, qname):
321			pass
322
323	bh	267	def start_table(self, name, qname, attrs):
324	jonathan	493	#print "table title: %s" % attrs.get('title', None)
325			pass
326	bh	267
327			def end_table(self, name, qname):
328			pass
329
330			def start_labellayer(self, name, qname, attrs):
331			self.aLayer = self.aMap.LabelLayer()
332
333			def start_label(self, name, qname, attrs):
334			x = float(attrs[(None, 'x')])
335			y = float(attrs[(None, 'y')])
336			text = attrs[(None, 'text')]
337			halign = attrs[(None, 'halign')]
338			valign = attrs[(None, 'valign')]
339			self.aLayer.AddLabel(x, y, text, halign = halign, valign = valign)
340
341			def characters(self, chars):
342			pass
343
344
345	jonathan	694	def load_session(filename):
346			"""Load a Thuban session from the file object file"""
347
348	jonathan	706	handler = SessionLoader()
349			handler.read(filename)
350	jonathan	694
351	bh	6	session = handler.theSession
352			# Newly loaded session aren't modified
353			session.UnsetModified()
354
355			return session
356
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