/[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 744 by jonathan, Fri Apr 25 10:26:35 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.ProjectionName = attrs.get((None, 'name'), None)
212          self.ProjectionParams = [ ]          self.ProjectionParams = [ ]
     XMLProcessor.start_dispatcher['projection'] = "start_projection"  
213    
214      def end_projection(self, name, qname):      def end_projection(self, name, qname):
215          self.aMap.SetProjection(Projection(self.ProjectionParams))          self.__projReceiver.SetProjection(
216      XMLProcessor.end_dispatcher['projection'] = "end_projection"              Projection(self.ProjectionParams, self.ProjectionName))
217    
218      def start_parameter(self, name, qname, attrs):      def start_parameter(self, name, qname, attrs):
219          s = attrs.get((None, 'value'))          s = attrs.get((None, 'value'))
220          s = str(s) # we can't handle unicode in proj          s = str(s) # we can't handle unicode in proj
221          self.ProjectionParams.append(s)          self.ProjectionParams.append(s)
     XMLProcessor.start_dispatcher['parameter'] = "start_parameter"  
222    
223      def start_layer(self, name, qname, attrs, layer_class = Layer):      def start_layer(self, name, qname, attrs, layer_class = Layer):
224          """Start a layer          """Start a layer
# Line 163  class ProcessSession(XMLProcessor): Line 233  class ProcessSession(XMLProcessor):
233          fill = parse_color(attrs.get((None, 'fill'), "None"))          fill = parse_color(attrs.get((None, 'fill'), "None"))
234          stroke = parse_color(attrs.get((None, 'stroke'), "#000000"))          stroke = parse_color(attrs.get((None, 'stroke'), "#000000"))
235          stroke_width = int(attrs.get((None, 'stroke_width'), "1"))          stroke_width = int(attrs.get((None, 'stroke_width'), "1"))
236          self.aLayer = layer_class(title, filename, fill = fill,          self.aLayer = layer_class(title,
237                                    stroke = stroke, lineWidth = stroke_width)                                    self.theSession.OpenShapefile(filename),
238      XMLProcessor.start_dispatcher['layer'] = "start_layer"                                    fill = fill, stroke = stroke,
239                                      lineWidth = stroke_width)
240    
241            self.__projReceiver = self.aLayer
242    
243      def end_layer(self, name, qname):      def end_layer(self, name, qname):
244          self.aMap.AddLayer(self.aLayer)          self.aMap.AddLayer(self.aLayer)
245      XMLProcessor.end_dispatcher['layer'] = "end_layer"          self.__projReceiver = None
246    
247      def start_classification(self, name, qname, attrs):      def start_classification(self, name, qname, attrs):
248          field = attrs.get((None, 'field'), None)          field = attrs.get((None, 'field'), None)
# Line 191  class ProcessSession(XMLProcessor): Line 264  class ProcessSession(XMLProcessor):
264    
265          self.aLayer.GetClassification().SetField(field)          self.aLayer.GetClassification().SetField(field)
266    
     XMLProcessor.start_dispatcher['classification'] = "start_classification"  
267    
268      def end_classification(self, name, qname):      def end_classification(self, name, qname):
269          pass          pass
     XMLProcessor.end_dispatcher['classification'] = "end_classification"  
270    
271      def start_clnull(self, name, qname, attrs):      def start_clnull(self, name, qname, attrs):
272          self.cl_group = ClassGroupDefault()          self.cl_group = ClassGroupDefault()
273          self.cl_group.SetLabel(attrs.get((None, 'label'), ""))          self.cl_group.SetLabel(attrs.get((None, 'label'), ""))
274          self.cl_prop = ClassGroupProperties()          self.cl_prop = ClassGroupProperties()
     XMLProcessor.start_dispatcher['clnull'] = "start_clnull"  
275    
276      def end_clnull(self, name, qname):      def end_clnull(self, name, qname):
277          self.cl_group.SetProperties(self.cl_prop)          self.cl_group.SetProperties(self.cl_prop)
278          self.aLayer.GetClassification().SetDefaultGroup(self.cl_group)          self.aLayer.GetClassification().SetDefaultGroup(self.cl_group)
279          del self.cl_group, self.cl_prop          del self.cl_group, self.cl_prop
     XMLProcessor.end_dispatcher['clnull'] = "end_clnull"  
280    
281      def start_clpoint(self, name, qname, attrs):      def start_clpoint(self, name, qname, attrs):
282          attrib_value = attrs.get((None, 'value'), "0")          attrib_value = attrs.get((None, 'value'), "0")
# Line 223  class ProcessSession(XMLProcessor): Line 292  class ProcessSession(XMLProcessor):
292          self.cl_group.SetLabel(attrs.get((None, 'label'), ""))          self.cl_group.SetLabel(attrs.get((None, 'label'), ""))
293          self.cl_prop = ClassGroupProperties()          self.cl_prop = ClassGroupProperties()
294    
     XMLProcessor.start_dispatcher['clpoint'] = "start_clpoint"  
295    
296      def end_clpoint(self, name, qname):      def end_clpoint(self, name, qname):
297          self.cl_group.SetProperties(self.cl_prop)          self.cl_group.SetProperties(self.cl_prop)
298          self.aLayer.GetClassification().AppendGroup(self.cl_group)          self.aLayer.GetClassification().AppendGroup(self.cl_group)
299          del self.cl_group, self.cl_prop          del self.cl_group, self.cl_prop
     XMLProcessor.end_dispatcher['clpoint'] = "end_clpoint"  
300    
301      def start_clrange(self, name, qname, attrs):      def start_clrange(self, name, qname, attrs):
302    
# Line 245  class ProcessSession(XMLProcessor): Line 312  class ProcessSession(XMLProcessor):
312          self.cl_group.SetLabel(attrs.get((None, 'label'), ""))          self.cl_group.SetLabel(attrs.get((None, 'label'), ""))
313          self.cl_prop = ClassGroupProperties()          self.cl_prop = ClassGroupProperties()
314    
     XMLProcessor.start_dispatcher['clrange'] = "start_clrange"  
315    
316      def end_clrange(self, name, qname):      def end_clrange(self, name, qname):
317          self.cl_group.SetProperties(self.cl_prop)          self.cl_group.SetProperties(self.cl_prop)
318          self.aLayer.GetClassification().AppendGroup(self.cl_group)          self.aLayer.GetClassification().AppendGroup(self.cl_group)
319          del self.cl_group, self.cl_prop          del self.cl_group, self.cl_prop
     XMLProcessor.end_dispatcher['clrange'] = "end_clrange"  
320    
321      def start_cldata(self, name, qname, attrs):      def start_cldata(self, name, qname, attrs):
322          self.cl_prop.SetLineColor(          self.cl_prop.SetLineColor(
# Line 259  class ProcessSession(XMLProcessor): Line 324  class ProcessSession(XMLProcessor):
324          self.cl_prop.SetLineWidth(          self.cl_prop.SetLineWidth(
325              int(attrs.get((None, 'stroke_width'), "0")))              int(attrs.get((None, 'stroke_width'), "0")))
326          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"  
327    
328      def end_cldata(self, name, qname):      def end_cldata(self, name, qname):
329          pass          pass
     XMLProcessor.end_dispatcher['cldata'] = "end_cldata"  
330    
331      def start_table(self, name, qname, attrs):      def start_table(self, name, qname, attrs):
332          #print "table title: %s" % attrs.get('title', None)          #print "table title: %s" % attrs.get('title', None)
333          pass          pass
     XMLProcessor.start_dispatcher['table'] = "start_table"  
334    
335      def end_table(self, name, qname):      def end_table(self, name, qname):
336          pass          pass
     XMLProcessor.end_dispatcher['table'] = "end_table"  
337    
338      def start_labellayer(self, name, qname, attrs):      def start_labellayer(self, name, qname, attrs):
339          self.aLayer = self.aMap.LabelLayer()          self.aLayer = self.aMap.LabelLayer()
     XMLProcessor.start_dispatcher['labellayer'] = "start_labellayer"  
340    
341      def start_label(self, name, qname, attrs):      def start_label(self, name, qname, attrs):
342          x = float(attrs[(None, 'x')])          x = float(attrs[(None, 'x')])
# Line 285  class ProcessSession(XMLProcessor): Line 345  class ProcessSession(XMLProcessor):
345          halign = attrs[(None, 'halign')]          halign = attrs[(None, 'halign')]
346          valign = attrs[(None, 'valign')]          valign = attrs[(None, 'valign')]
347          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"  
348    
349      def characters(self, chars):      def characters(self, chars):
350          pass          pass
351    
352    
 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)  
   
353  def load_session(filename):  def load_session(filename):
354      """Load a Thuban session from the file object file"""      """Load a Thuban session from the file object file"""
355    
356      dir = os.path.dirname(filename)      handler = SessionLoader()
357      handler = ProcessSession(dir)      handler.read(filename)
   
     load_xmlfile(filename, handler)  
358    
359      session = handler.theSession      session = handler.theSession
360      # Newly loaded session aren't modified      # Newly loaded session aren't modified
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