/[thuban]/branches/WIP-pyshapelib-bramz/Thuban/Model/load.py
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revision 614 by jonathan, Mon Apr 7 08:56:38 2003 UTC revision 723 by bh, Thu Apr 24 15:31:53 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 ProcessSession(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 ProcessSession(xml.sax.handler.Con Line 74  class ProcessSession(xml.sax.handler.Con
74      end_dispatcher = {}      end_dispatcher = {}
75    
76    
77      def __init__(self, directory):      def __init__(self):
         """Inititialize the Sax handler.  
   
         The directory parameter should be the directory containing the  
         session file. It's needed to interpret embedded relative  
         filenames.  
         """  
         self.directory = directory  
78          self.chars = ''          self.chars = ''
79          self.theSession = None          self.__parser = None
80          self.aMap = None          self.__directory = ""
81          self.aLayer = None          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    
135        def AddDispatchers(self, dict):
136            """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    
146            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    class SessionLoader(XMLReader):
171    
172        def __init__(self):
173            """Inititialize the Sax handler."""
174            XMLReader.__init__(self)
175    
176            self.theSession = None
177            self.aMap = None
178            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))
     start_dispatcher['session'] = "start_session"  
197    
198      def end_session(self, name, qname):      def end_session(self, name, qname):
199          pass          pass
     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))
     start_dispatcher['map'] = "start_map"  
204    
205      def end_map(self, name, qname):      def end_map(self, name, qname):
206          self.theSession.AddMap(self.aMap)          self.theSession.AddMap(self.aMap)
     end_dispatcher['map'] = "end_map"  
207    
208      def start_projection(self, name, qname, attrs):      def start_projection(self, name, qname, attrs):
209          self.ProjectionParams = [ ]          self.ProjectionParams = [ ]
     start_dispatcher['projection'] = "start_projection"  
210    
211      def end_projection(self, name, qname):      def end_projection(self, name, qname):
212          self.aMap.SetProjection(Projection(self.ProjectionParams))          self.aMap.SetProjection(Projection(self.ProjectionParams))
     end_dispatcher['projection'] = "end_projection"  
213    
214      def start_parameter(self, name, qname, attrs):      def start_parameter(self, name, qname, attrs):
215          s = attrs.get((None, 'value'))          s = attrs.get((None, 'value'))
216          s = str(s) # we can't handle unicode in proj          s = str(s) # we can't handle unicode in proj
217          self.ProjectionParams.append(s)          self.ProjectionParams.append(s)
     start_dispatcher['parameter'] = "start_parameter"  
218    
219      def start_layer(self, name, qname, attrs, layer_class = Layer):      def start_layer(self, name, qname, attrs, layer_class = Layer):
220          """Start a layer          """Start a layer
# Line 149  class ProcessSession(xml.sax.handler.Con Line 225  class ProcessSession(xml.sax.handler.Con
225          """          """
226          title = attrs.get((None, 'title'), "")          title = attrs.get((None, 'title'), "")
227          filename = attrs.get((None, 'filename'), "")          filename = attrs.get((None, 'filename'), "")
228          filename = os.path.join(self.directory, filename)          filename = os.path.join(self.GetDirectory(), filename)
229          fill = parse_color(attrs.get((None, 'fill'), "None"))          fill = parse_color(attrs.get((None, 'fill'), "None"))
230          stroke = parse_color(attrs.get((None, 'stroke'), "#000000"))          stroke = parse_color(attrs.get((None, 'stroke'), "#000000"))
231          stroke_width = int(attrs.get((None, 'stroke_width'), "1"))          stroke_width = int(attrs.get((None, 'stroke_width'), "1"))
232          self.aLayer = layer_class(title, filename, fill = fill,          self.aLayer = layer_class(title,
233                                    stroke = stroke, lineWidth = stroke_width)                                    self.theSession.OpenShapefile(filename),
234      start_dispatcher['layer'] = "start_layer"                                    fill = fill, stroke = stroke,
235                                      lineWidth = stroke_width)
236    
237      def end_layer(self, name, qname):      def end_layer(self, name, qname):
238          self.aMap.AddLayer(self.aLayer)          self.aMap.AddLayer(self.aLayer)
     end_dispatcher['layer'] = "end_layer"  
239    
240      def start_classification(self, name, qname, attrs):      def start_classification(self, name, qname, attrs):
241          field = attrs.get((None, 'field'), None)          field = attrs.get((None, 'field'), None)
# Line 181  class ProcessSession(xml.sax.handler.Con Line 257  class ProcessSession(xml.sax.handler.Con
257    
258          self.aLayer.GetClassification().SetField(field)          self.aLayer.GetClassification().SetField(field)
259    
     start_dispatcher['classification'] = "start_classification"  
260    
261      def end_classification(self, name, qname):      def end_classification(self, name, qname):
262          pass          pass
     end_dispatcher['classification'] = "end_classification"  
263    
264      def start_clnull(self, name, qname, attrs):      def start_clnull(self, name, qname, attrs):
265          self.cl_group = ClassGroupDefault()          self.cl_group = ClassGroupDefault()
266          self.cl_group.SetLabel(attrs.get((None, 'label'), ""))          self.cl_group.SetLabel(attrs.get((None, 'label'), ""))
267          self.cl_prop = ClassGroupProperties()          self.cl_prop = ClassGroupProperties()
     start_dispatcher['clnull'] = "start_clnull"  
268    
269      def end_clnull(self, name, qname):      def end_clnull(self, name, qname):
270          self.cl_group.SetProperties(self.cl_prop)          self.cl_group.SetProperties(self.cl_prop)
271          self.aLayer.GetClassification().SetDefaultGroup(self.cl_group)          self.aLayer.GetClassification().SetDefaultGroup(self.cl_group)
272          del self.cl_group, self.cl_prop          del self.cl_group, self.cl_prop
     end_dispatcher['clnull'] = "end_clnull"  
273    
274      def start_clpoint(self, name, qname, attrs):      def start_clpoint(self, name, qname, attrs):
275          attrib_value = attrs.get((None, 'value'), "0")          attrib_value = attrs.get((None, 'value'), "0")
# Line 213  class ProcessSession(xml.sax.handler.Con Line 285  class ProcessSession(xml.sax.handler.Con
285          self.cl_group.SetLabel(attrs.get((None, 'label'), ""))          self.cl_group.SetLabel(attrs.get((None, 'label'), ""))
286          self.cl_prop = ClassGroupProperties()          self.cl_prop = ClassGroupProperties()
287    
     start_dispatcher['clpoint'] = "start_clpoint"  
288    
289      def end_clpoint(self, name, qname):      def end_clpoint(self, name, qname):
290          self.cl_group.SetProperties(self.cl_prop)          self.cl_group.SetProperties(self.cl_prop)
291          self.aLayer.GetClassification().AppendGroup(self.cl_group)          self.aLayer.GetClassification().AppendGroup(self.cl_group)
292          del self.cl_group, self.cl_prop          del self.cl_group, self.cl_prop
     end_dispatcher['clpoint'] = "end_clpoint"  
293    
294      def start_clrange(self, name, qname, attrs):      def start_clrange(self, name, qname, attrs):
295    
# Line 235  class ProcessSession(xml.sax.handler.Con Line 305  class ProcessSession(xml.sax.handler.Con
305          self.cl_group.SetLabel(attrs.get((None, 'label'), ""))          self.cl_group.SetLabel(attrs.get((None, 'label'), ""))
306          self.cl_prop = ClassGroupProperties()          self.cl_prop = ClassGroupProperties()
307    
     start_dispatcher['clrange'] = "start_clrange"  
308    
309      def end_clrange(self, name, qname):      def end_clrange(self, name, qname):
310          self.cl_group.SetProperties(self.cl_prop)          self.cl_group.SetProperties(self.cl_prop)
311          self.aLayer.GetClassification().AppendGroup(self.cl_group)          self.aLayer.GetClassification().AppendGroup(self.cl_group)
312          del self.cl_group, self.cl_prop          del self.cl_group, self.cl_prop
     end_dispatcher['clrange'] = "end_clrange"  
313    
314      def start_cldata(self, name, qname, attrs):      def start_cldata(self, name, qname, attrs):
315          self.cl_prop.SetLineColor(          self.cl_prop.SetLineColor(
# Line 249  class ProcessSession(xml.sax.handler.Con Line 317  class ProcessSession(xml.sax.handler.Con
317          self.cl_prop.SetLineWidth(          self.cl_prop.SetLineWidth(
318              int(attrs.get((None, 'stroke_width'), "0")))              int(attrs.get((None, 'stroke_width'), "0")))
319          self.cl_prop.SetFill(parse_color(attrs.get((None, 'fill'), "None")))          self.cl_prop.SetFill(parse_color(attrs.get((None, 'fill'), "None")))
     start_dispatcher['cldata'] = "start_cldata"  
320    
321      def end_cldata(self, name, qname):      def end_cldata(self, name, qname):
322          pass          pass
     end_dispatcher['cldata'] = "end_cldata"  
323    
324      def start_table(self, name, qname, attrs):      def start_table(self, name, qname, attrs):
325          #print "table title: %s" % attrs.get('title', None)          #print "table title: %s" % attrs.get('title', None)
326          pass          pass
     start_dispatcher['table'] = "start_table"  
327    
328      def end_table(self, name, qname):      def end_table(self, name, qname):
329          pass          pass
     end_dispatcher['table'] = "end_table"  
330    
331      def start_labellayer(self, name, qname, attrs):      def start_labellayer(self, name, qname, attrs):
332          self.aLayer = self.aMap.LabelLayer()          self.aLayer = self.aMap.LabelLayer()
     start_dispatcher['labellayer'] = "start_labellayer"  
333    
334      def start_label(self, name, qname, attrs):      def start_label(self, name, qname, attrs):
335          x = float(attrs[(None, 'x')])          x = float(attrs[(None, 'x')])
# Line 275  class ProcessSession(xml.sax.handler.Con Line 338  class ProcessSession(xml.sax.handler.Con
338          halign = attrs[(None, 'halign')]          halign = attrs[(None, 'halign')]
339          valign = attrs[(None, 'valign')]          valign = attrs[(None, 'valign')]
340          self.aLayer.AddLabel(x, y, text, halign = halign, valign = valign)          self.aLayer.AddLabel(x, y, text, halign = halign, valign = valign)
     start_dispatcher['label'] = "start_label"  
341    
342      def characters(self, chars):      def characters(self, chars):
343          pass          pass
# Line 283  class ProcessSession(xml.sax.handler.Con Line 345  class ProcessSession(xml.sax.handler.Con
345    
346  def load_session(filename):  def load_session(filename):
347      """Load a Thuban session from the file object file"""      """Load a Thuban session from the file object file"""
     dir = os.path.dirname(filename)  
     file = open(filename)  
     handler = ProcessSession(dir)  
   
     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  
348    
349      parser.parse(file)      handler = SessionLoader()
350        handler.read(filename)
351    
352      session = handler.theSession      session = handler.theSession
353      # Newly loaded session aren't modified      # Newly loaded session aren't modified
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