/[thuban]/branches/WIP-pyshapelib-bramz/Thuban/Model/load.py
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revision 694 by jonathan, Wed Apr 16 16:39:18 2003 UTC revision 737 by jonathan, Fri Apr 25 09:12:17 2003 UTC
# Line 1  Line 1 
1  # Copyright (C) 2001, 2002 by Intevation GmbH  # Copyright (C) 2001, 2002, 2003 by Intevation GmbH
2  # Authors:  # Authors:
3  # Jan-Oliver Wagner <[email protected]>  # Jan-Oliver Wagner <[email protected]>
4  # Bernhard Herzog <[email protected]>  # Bernhard Herzog <[email protected]>
# Line 13  Parser for thuban session files. Line 13  Parser for thuban session files.
13    
14  __version__ = "$Revision$"  __version__ = "$Revision$"
15    
16  import sys, string, os  import string, os
17    
18  import xml.sax  import xml.sax
19  import xml.sax.handler  import xml.sax.handler
# Line 58  def parse_color(color): Line 58  def parse_color(color):
58      return result      return result
59    
60    
61  class XMLProcessor(xml.sax.handler.ContentHandler):  class XMLReader(xml.sax.handler.ContentHandler):
62    
63      # Dictionary mapping element names (or (URI, element name) pairs for      # Dictionary mapping element names (or (URI, element name) pairs for
64      # documents using namespaces) to method names. The methods should      # documents using namespaces) to method names. The methods should
# Line 74  class XMLProcessor(xml.sax.handler.Conte Line 74  class XMLProcessor(xml.sax.handler.Conte
74      end_dispatcher = {}      end_dispatcher = {}
75    
76    
77      def __init__(self, directory):      def __init__(self):
78          """Inititialize the Sax handler.          self.chars = ''
79            self.__parser = None
80            self.__directory = ""
81            self.__dispatchers = {}
82    
83        def read(self, file_or_filename):
84    
85            if hasattr(file_or_filename, "read"):
86                # it's a file object
87                self.__directory = ""
88                self.__file = file_or_filename
89            else:
90                filename = file_or_filename
91                self.__directory = os.path.dirname(filename)
92                self.__file = open(filename)
93    
94            if self.__parser is None:
95                self.__parser = make_parser()
96                self.__parser.setContentHandler(self)
97                self.__parser.setErrorHandler(ErrorHandler())
98                self.__parser.setFeature(xml.sax.handler.feature_namespaces, 1)
99    
100                #
101                # Well, this isn't pretty, but it appears that if you
102                # use Python 2.2 without the site-package _xmlplus then
103                # the following will fail, and without them it will work.
104                # However, if you do have the site-package and you don't
105                # call these functions, the reader raises an exception
106                #
107                # The reason we set these to 0 in the first place is
108                # because there is an unresolved issue with external
109                # entities causing an exception in the reader
110                #
111                try:
112                    self.__parser.setFeature(xml.sax.handler.feature_validation,0)
113                    self.__parser.setFeature(xml.sax.handler.feature_external_ges,0)
114                    self.__parser.setFeature(xml.sax.handler.feature_external_pes,0)
115                except SAXNotRecognizedException:
116                    pass
117    
118            self.__parser.parse(self.__file)
119    
120            self.close()
121    
122        def close(self):
123            self.__file.close()
124            
125        def GetFilename(self):
126            if hasattr(self.__file, "name"):
127                return self.__file.name
128    
129            return ""
130    
131        def GetDirectory(self):
132            return self.__directory
133    
134          The directory parameter should be the directory containing the  
135          session file. It's needed to interpret embedded relative      def AddDispatchers(self, dict):
136          filenames.          """Add the function names that should be used to process XML tags.
137    
138            dict -- a dictionary whose keys are XML tag strings and whose values
139                    are pairs of strings such that the first string is
140                    the name of the function that should be called when the
141                    XML tag opens and the second string is the name of the
142                    function that should be called when the XML tag closes.
143                    If a pair element is None, no function is called.
144          """          """
145          self.directory = directory  
146          self.chars = ''          self.__dispatchers.update(dict)
147    
148      def startElementNS(self, name, qname, attrs):      def startElementNS(self, name, qname, attrs):
149          """Call the method given for name in self.start_dispatcher          """Call the method given for name in self.start_dispatcher
150          """          """
151          if name[0] is None:          if name[0] is None:
152              method_name = self.start_dispatcher.get(name[1])              method_name = self.__dispatchers.get(name[1])
153          else:          else:
154              # Dispatch with namespace              # Dispatch with namespace
155              method_name = self.start_dispatcher.get(name)              method_name = self.__dispatchers.get(name)
156          if method_name is not None:          if method_name is not None and method_name[0] is not None:
157              getattr(self, method_name)(name, qname, attrs)              getattr(self, method_name[0])(name, qname, attrs)
158    
159      def endElementNS(self, name, qname):      def endElementNS(self, name, qname):
160          """Call the method given for name in self.end_dispatcher          """Call the method given for name in self.end_dispatcher
161          """          """
162          if name[0] is None:          if name[0] is None:
163              method_name = self.end_dispatcher.get(name[1])              method_name = self.__dispatchers.get(name[1])
164          else:          else:
165              # Dispatch with namespace              # Dispatch with namespace
166              method_name = self.end_dispatcher.get(name)              method_name = self.__dispatchers.get(name)
167          if method_name is not None:          if method_name is not None and method_name[1] is not None:
168              getattr(self, method_name)(name, qname)              getattr(self, method_name[1])(name, qname)
169    
170      def GetDirectory(self):  class SessionLoader(XMLReader):
         return self.directory  
   
 class ProcessSession(XMLProcessor):  
171    
172      def __init__(self, directory):      def __init__(self):
173          """Inititialize the Sax handler."""          """Inititialize the Sax handler."""
174          XMLProcessor.__init__(self, directory)          XMLReader.__init__(self)
175    
176          self.theSession = None          self.theSession = None
177          self.aMap = None          self.aMap = None
178          self.aLayer = None          self.aLayer = None
179    
180            XMLReader.AddDispatchers(self,
181                {'session'       : ("start_session",        "end_session"),
182                 'map'           : ("start_map",            "end_map"),
183                 'projection'    : ("start_projection",     "end_projection"),
184                 'parameter'     : ("start_parameter",      None),
185                 'layer'         : ("start_layer",          "end_layer"),
186                 'classification': ("start_classification", "end_classification"),
187                 'clnull'        : ("start_clnull",         "end_clnull"),
188                 'clpoint'       : ("start_clpoint",        "end_clpoint"),
189                 'clrange'       : ("start_clrange",        "end_clrange"),
190                 'cldata'        : ("start_cldata",         "end_cldata"),
191                 'table'         : ("start_table",          "end_table"),
192                 'labellayer'    : ("start_labellayer",     None),
193                 'label'         : ("start_label",          None)})
194    
195      def start_session(self, name, qname, attrs):      def start_session(self, name, qname, attrs):
196          self.theSession = Session(attrs.get((None, 'title'), None))          self.theSession = Session(attrs.get((None, 'title'), None))
     XMLProcessor.start_dispatcher['session'] = "start_session"  
197    
198      def end_session(self, name, qname):      def end_session(self, name, qname):
199          pass          pass
     XMLProcessor.end_dispatcher['session'] = "end_session"  
200    
201      def start_map(self, name, qname, attrs):      def start_map(self, name, qname, attrs):
202          """Start a map."""          """Start a map."""
203          self.aMap = Map(attrs.get((None, 'title'), None))          self.aMap = Map(attrs.get((None, 'title'), None))
204      XMLProcessor.start_dispatcher['map'] = "start_map"          self.__projReceiver = self.aMap
205    
206      def end_map(self, name, qname):      def end_map(self, name, qname):
207          self.theSession.AddMap(self.aMap)          self.theSession.AddMap(self.aMap)
208      XMLProcessor.end_dispatcher['map'] = "end_map"          self.__projReceiver = None
209    
210      def start_projection(self, name, qname, attrs):      def start_projection(self, name, qname, attrs):
211          self.ProjectionParams = [ ]          self.ProjectionParams = [ ]
     XMLProcessor.start_dispatcher['projection'] = "start_projection"  
212    
213      def end_projection(self, name, qname):      def end_projection(self, name, qname):
214          self.aMap.SetProjection(Projection(self.ProjectionParams))          self.__projReceiver.SetProjection(Projection(self.ProjectionParams))
     XMLProcessor.end_dispatcher['projection'] = "end_projection"  
215    
216      def start_parameter(self, name, qname, attrs):      def start_parameter(self, name, qname, attrs):
217          s = attrs.get((None, 'value'))          s = attrs.get((None, 'value'))
218          s = str(s) # we can't handle unicode in proj          s = str(s) # we can't handle unicode in proj
219          self.ProjectionParams.append(s)          self.ProjectionParams.append(s)
     XMLProcessor.start_dispatcher['parameter'] = "start_parameter"  
220    
221      def start_layer(self, name, qname, attrs, layer_class = Layer):      def start_layer(self, name, qname, attrs, layer_class = Layer):
222          """Start a layer          """Start a layer
# Line 163  class ProcessSession(XMLProcessor): Line 231  class ProcessSession(XMLProcessor):
231          fill = parse_color(attrs.get((None, 'fill'), "None"))          fill = parse_color(attrs.get((None, 'fill'), "None"))
232          stroke = parse_color(attrs.get((None, 'stroke'), "#000000"))          stroke = parse_color(attrs.get((None, 'stroke'), "#000000"))
233          stroke_width = int(attrs.get((None, 'stroke_width'), "1"))          stroke_width = int(attrs.get((None, 'stroke_width'), "1"))
234          self.aLayer = layer_class(title, filename, fill = fill,          self.aLayer = layer_class(title,
235                                    stroke = stroke, lineWidth = stroke_width)                                    self.theSession.OpenShapefile(filename),
236      XMLProcessor.start_dispatcher['layer'] = "start_layer"                                    fill = fill, stroke = stroke,
237                                      lineWidth = stroke_width)
238    
239            self.__projReceiver = self.aLayer
240    
241      def end_layer(self, name, qname):      def end_layer(self, name, qname):
242          self.aMap.AddLayer(self.aLayer)          self.aMap.AddLayer(self.aLayer)
243      XMLProcessor.end_dispatcher['layer'] = "end_layer"          self.__projReceiver = None
244    
245      def start_classification(self, name, qname, attrs):      def start_classification(self, name, qname, attrs):
246          field = attrs.get((None, 'field'), None)          field = attrs.get((None, 'field'), None)
# Line 191  class ProcessSession(XMLProcessor): Line 262  class ProcessSession(XMLProcessor):
262    
263          self.aLayer.GetClassification().SetField(field)          self.aLayer.GetClassification().SetField(field)
264    
     XMLProcessor.start_dispatcher['classification'] = "start_classification"  
265    
266      def end_classification(self, name, qname):      def end_classification(self, name, qname):
267          pass          pass
     XMLProcessor.end_dispatcher['classification'] = "end_classification"  
268    
269      def start_clnull(self, name, qname, attrs):      def start_clnull(self, name, qname, attrs):
270          self.cl_group = ClassGroupDefault()          self.cl_group = ClassGroupDefault()
271          self.cl_group.SetLabel(attrs.get((None, 'label'), ""))          self.cl_group.SetLabel(attrs.get((None, 'label'), ""))
272          self.cl_prop = ClassGroupProperties()          self.cl_prop = ClassGroupProperties()
     XMLProcessor.start_dispatcher['clnull'] = "start_clnull"  
273    
274      def end_clnull(self, name, qname):      def end_clnull(self, name, qname):
275          self.cl_group.SetProperties(self.cl_prop)          self.cl_group.SetProperties(self.cl_prop)
276          self.aLayer.GetClassification().SetDefaultGroup(self.cl_group)          self.aLayer.GetClassification().SetDefaultGroup(self.cl_group)
277          del self.cl_group, self.cl_prop          del self.cl_group, self.cl_prop
     XMLProcessor.end_dispatcher['clnull'] = "end_clnull"  
278    
279      def start_clpoint(self, name, qname, attrs):      def start_clpoint(self, name, qname, attrs):
280          attrib_value = attrs.get((None, 'value'), "0")          attrib_value = attrs.get((None, 'value'), "0")
# Line 223  class ProcessSession(XMLProcessor): Line 290  class ProcessSession(XMLProcessor):
290          self.cl_group.SetLabel(attrs.get((None, 'label'), ""))          self.cl_group.SetLabel(attrs.get((None, 'label'), ""))
291          self.cl_prop = ClassGroupProperties()          self.cl_prop = ClassGroupProperties()
292    
     XMLProcessor.start_dispatcher['clpoint'] = "start_clpoint"  
293    
294      def end_clpoint(self, name, qname):      def end_clpoint(self, name, qname):
295          self.cl_group.SetProperties(self.cl_prop)          self.cl_group.SetProperties(self.cl_prop)
296          self.aLayer.GetClassification().AppendGroup(self.cl_group)          self.aLayer.GetClassification().AppendGroup(self.cl_group)
297          del self.cl_group, self.cl_prop          del self.cl_group, self.cl_prop
     XMLProcessor.end_dispatcher['clpoint'] = "end_clpoint"  
298    
299      def start_clrange(self, name, qname, attrs):      def start_clrange(self, name, qname, attrs):
300    
# Line 245  class ProcessSession(XMLProcessor): Line 310  class ProcessSession(XMLProcessor):
310          self.cl_group.SetLabel(attrs.get((None, 'label'), ""))          self.cl_group.SetLabel(attrs.get((None, 'label'), ""))
311          self.cl_prop = ClassGroupProperties()          self.cl_prop = ClassGroupProperties()
312    
     XMLProcessor.start_dispatcher['clrange'] = "start_clrange"  
313    
314      def end_clrange(self, name, qname):      def end_clrange(self, name, qname):
315          self.cl_group.SetProperties(self.cl_prop)          self.cl_group.SetProperties(self.cl_prop)
316          self.aLayer.GetClassification().AppendGroup(self.cl_group)          self.aLayer.GetClassification().AppendGroup(self.cl_group)
317          del self.cl_group, self.cl_prop          del self.cl_group, self.cl_prop
     XMLProcessor.end_dispatcher['clrange'] = "end_clrange"  
318    
319      def start_cldata(self, name, qname, attrs):      def start_cldata(self, name, qname, attrs):
320          self.cl_prop.SetLineColor(          self.cl_prop.SetLineColor(
# Line 259  class ProcessSession(XMLProcessor): Line 322  class ProcessSession(XMLProcessor):
322          self.cl_prop.SetLineWidth(          self.cl_prop.SetLineWidth(
323              int(attrs.get((None, 'stroke_width'), "0")))              int(attrs.get((None, 'stroke_width'), "0")))
324          self.cl_prop.SetFill(parse_color(attrs.get((None, 'fill'), "None")))          self.cl_prop.SetFill(parse_color(attrs.get((None, 'fill'), "None")))
     XMLProcessor.start_dispatcher['cldata'] = "start_cldata"  
325    
326      def end_cldata(self, name, qname):      def end_cldata(self, name, qname):
327          pass          pass
     XMLProcessor.end_dispatcher['cldata'] = "end_cldata"  
328    
329      def start_table(self, name, qname, attrs):      def start_table(self, name, qname, attrs):
330          #print "table title: %s" % attrs.get('title', None)          #print "table title: %s" % attrs.get('title', None)
331          pass          pass
     XMLProcessor.start_dispatcher['table'] = "start_table"  
332    
333      def end_table(self, name, qname):      def end_table(self, name, qname):
334          pass          pass
     XMLProcessor.end_dispatcher['table'] = "end_table"  
335    
336      def start_labellayer(self, name, qname, attrs):      def start_labellayer(self, name, qname, attrs):
337          self.aLayer = self.aMap.LabelLayer()          self.aLayer = self.aMap.LabelLayer()
     XMLProcessor.start_dispatcher['labellayer'] = "start_labellayer"  
338    
339      def start_label(self, name, qname, attrs):      def start_label(self, name, qname, attrs):
340          x = float(attrs[(None, 'x')])          x = float(attrs[(None, 'x')])
# Line 285  class ProcessSession(XMLProcessor): Line 343  class ProcessSession(XMLProcessor):
343          halign = attrs[(None, 'halign')]          halign = attrs[(None, 'halign')]
344          valign = attrs[(None, 'valign')]          valign = attrs[(None, 'valign')]
345          self.aLayer.AddLabel(x, y, text, halign = halign, valign = valign)          self.aLayer.AddLabel(x, y, text, halign = halign, valign = valign)
     XMLProcessor.start_dispatcher['label'] = "start_label"  
346    
347      def characters(self, chars):      def characters(self, chars):
348          pass          pass
349    
350    
 def load_xmlfile(filename, handler):  
     file = open(filename)  
   
     parser = make_parser()  
     parser.setContentHandler(handler)  
     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(file)  
   
351  def load_session(filename):  def load_session(filename):
352      """Load a Thuban session from the file object file"""      """Load a Thuban session from the file object file"""
353    
354      dir = os.path.dirname(filename)      handler = SessionLoader()
355      handler = ProcessSession(dir)      handler.read(filename)
   
     load_xmlfile(filename, handler)  
356    
357      session = handler.theSession      session = handler.theSession
358      # Newly loaded session aren't modified      # Newly loaded session aren't modified
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