/[thuban]/branches/WIP-pyshapelib-bramz/Thuban/Model/load.py
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revision 493 by jonathan, Mon Mar 10 10:45:10 2003 UTC revision 722 by jonathan, Thu Apr 24 10:12:29 2003 UTC
# Line 17  import sys, string, os Line 17  import sys, string, os
17    
18  import xml.sax  import xml.sax
19  import xml.sax.handler  import xml.sax.handler
20  from xml.sax import make_parser, ErrorHandler  from xml.sax import make_parser, ErrorHandler, SAXNotRecognizedException
21    
22  from Thuban import _  from Thuban import _
23  from Thuban.common import *  from Thuban.common import *
# Line 43  def parse_color(color): Line 43  def parse_color(color):
43      """      """
44      color = string.strip(color)      color = string.strip(color)
45      if color == "None":      if color == "None":
46          result = Color.None          result = Color.Transparent
47      elif color[0] == '#':      elif color[0] == '#':
48          if len(color) == 7:          if len(color) == 7:
49              r = string.atoi(color[1:3], 16) / 255.0              r = string.atoi(color[1:3], 16) / 255.0
# 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, filename, fill = fill,
233                                    stroke = stroke, lineWidth = stroke_width)                                    stroke = stroke, lineWidth = stroke_width)
     start_dispatcher['layer'] = "start_layer"  
234    
235      def end_layer(self, name, qname):      def end_layer(self, name, qname):
236          self.aMap.AddLayer(self.aLayer)          self.aMap.AddLayer(self.aLayer)
     end_dispatcher['layer'] = "end_layer"  
237    
238      def start_classification(self, name, qname, attrs):      def start_classification(self, name, qname, attrs):
239          field = attrs.get((None, 'field'), None)          field = attrs.get((None, 'field'), None)
# Line 181  class ProcessSession(xml.sax.handler.Con Line 255  class ProcessSession(xml.sax.handler.Con
255    
256          self.aLayer.GetClassification().SetField(field)          self.aLayer.GetClassification().SetField(field)
257    
     start_dispatcher['classification'] = "start_classification"  
258    
259      def end_classification(self, name, qname):      def end_classification(self, name, qname):
260          pass          pass
     end_dispatcher['classification'] = "end_classification"  
261    
262      def start_clnull(self, name, qname, attrs):      def start_clnull(self, name, qname, attrs):
263          self.cl_group = ClassGroupDefault()          self.cl_group = ClassGroupDefault()
264          self.cl_group.SetLabel(attrs.get((None, 'label'), ""))          self.cl_group.SetLabel(attrs.get((None, 'label'), ""))
265          self.cl_prop = ClassGroupProperties()          self.cl_prop = ClassGroupProperties()
     start_dispatcher['clnull'] = "start_clnull"  
266    
267      def end_clnull(self, name, qname):      def end_clnull(self, name, qname):
268          self.cl_group.SetProperties(self.cl_prop)          self.cl_group.SetProperties(self.cl_prop)
269          self.aLayer.GetClassification().SetDefaultGroup(self.cl_group)          self.aLayer.GetClassification().SetDefaultGroup(self.cl_group)
270          del self.cl_group, self.cl_prop          del self.cl_group, self.cl_prop
     end_dispatcher['clnull'] = "end_clnull"  
271    
272      def start_clpoint(self, name, qname, attrs):      def start_clpoint(self, name, qname, attrs):
273          attrib_value = attrs.get((None, 'value'), "0")          attrib_value = attrs.get((None, 'value'), "0")
# Line 213  class ProcessSession(xml.sax.handler.Con Line 283  class ProcessSession(xml.sax.handler.Con
283          self.cl_group.SetLabel(attrs.get((None, 'label'), ""))          self.cl_group.SetLabel(attrs.get((None, 'label'), ""))
284          self.cl_prop = ClassGroupProperties()          self.cl_prop = ClassGroupProperties()
285    
     start_dispatcher['clpoint'] = "start_clpoint"  
286    
287      def end_clpoint(self, name, qname):      def end_clpoint(self, name, qname):
288          self.cl_group.SetProperties(self.cl_prop)          self.cl_group.SetProperties(self.cl_prop)
289          self.aLayer.GetClassification().AddGroup(self.cl_group)          self.aLayer.GetClassification().AppendGroup(self.cl_group)
290          del self.cl_group, self.cl_prop          del self.cl_group, self.cl_prop
     end_dispatcher['clpoint'] = "end_clpoint"  
291    
292      def start_clrange(self, name, qname, attrs):      def start_clrange(self, name, qname, attrs):
293    
# Line 235  class ProcessSession(xml.sax.handler.Con Line 303  class ProcessSession(xml.sax.handler.Con
303          self.cl_group.SetLabel(attrs.get((None, 'label'), ""))          self.cl_group.SetLabel(attrs.get((None, 'label'), ""))
304          self.cl_prop = ClassGroupProperties()          self.cl_prop = ClassGroupProperties()
305    
     start_dispatcher['clrange'] = "start_clrange"  
306    
307      def end_clrange(self, name, qname):      def end_clrange(self, name, qname):
308          self.cl_group.SetProperties(self.cl_prop)          self.cl_group.SetProperties(self.cl_prop)
309          self.aLayer.GetClassification().AddGroup(self.cl_group)          self.aLayer.GetClassification().AppendGroup(self.cl_group)
310          del self.cl_group, self.cl_prop          del self.cl_group, self.cl_prop
     end_dispatcher['clrange'] = "end_clrange"  
311    
312      def start_cldata(self, name, qname, attrs):      def start_cldata(self, name, qname, attrs):
313          self.cl_prop.SetLineColor(          self.cl_prop.SetLineColor(
# Line 249  class ProcessSession(xml.sax.handler.Con Line 315  class ProcessSession(xml.sax.handler.Con
315          self.cl_prop.SetLineWidth(          self.cl_prop.SetLineWidth(
316              int(attrs.get((None, 'stroke_width'), "0")))              int(attrs.get((None, 'stroke_width'), "0")))
317          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"  
318    
319      def end_cldata(self, name, qname):      def end_cldata(self, name, qname):
320          pass          pass
     end_dispatcher['cldata'] = "end_cldata"  
321    
322      def start_table(self, name, qname, attrs):      def start_table(self, name, qname, attrs):
323          #print "table title: %s" % attrs.get('title', None)          #print "table title: %s" % attrs.get('title', None)
324          pass          pass
     start_dispatcher['table'] = "start_table"  
325    
326      def end_table(self, name, qname):      def end_table(self, name, qname):
327          pass          pass
     end_dispatcher['table'] = "end_table"  
328    
329      def start_labellayer(self, name, qname, attrs):      def start_labellayer(self, name, qname, attrs):
330          self.aLayer = self.aMap.LabelLayer()          self.aLayer = self.aMap.LabelLayer()
     start_dispatcher['labellayer'] = "start_labellayer"  
331    
332      def start_label(self, name, qname, attrs):      def start_label(self, name, qname, attrs):
333          x = float(attrs[(None, 'x')])          x = float(attrs[(None, 'x')])
# Line 275  class ProcessSession(xml.sax.handler.Con Line 336  class ProcessSession(xml.sax.handler.Con
336          halign = attrs[(None, 'halign')]          halign = attrs[(None, 'halign')]
337          valign = attrs[(None, 'valign')]          valign = attrs[(None, 'valign')]
338          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"  
339    
340      def characters(self, chars):      def characters(self, chars):
341          pass          pass
# Line 283  class ProcessSession(xml.sax.handler.Con Line 343  class ProcessSession(xml.sax.handler.Con
343    
344  def load_session(filename):  def load_session(filename):
345      """Load a Thuban session from the file object file"""      """Load a Thuban session from the file object file"""
346      dir = os.path.dirname(filename)  
347      file = open(filename)      handler = SessionLoader()
348      handler = ProcessSession(dir)      handler.read(filename)
   
     parser = make_parser()  
     parser.setContentHandler(handler)  
     parser.setErrorHandler(ErrorHandler())  
     parser.setFeature(xml.sax.handler.feature_namespaces, 1)  
     parser.parse(file)  
349    
350      session = handler.theSession      session = handler.theSession
351      # Newly loaded session aren't modified      # Newly loaded session aren't modified
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