/[thuban]/branches/WIP-pyshapelib-bramz/Thuban/Model/load.py
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revision 390 by jonathan, Mon Feb 10 15:25:49 2003 UTC revision 874 by jonathan, Fri May 9 16:31:12 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]>
5    # Jonathan Coles <[email protected]>
6  #  #
7  # This program is free software under the GPL (>=v2)  # This program is free software under the GPL (>=v2)
8  # Read the file COPYING coming with GRASS for details.  # Read the file COPYING coming with GRASS for details.
# Line 12  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
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    
24    from Thuban.Model.table import FIELDTYPE_INT, FIELDTYPE_DOUBLE, \
25         FIELDTYPE_STRING
26    
27  from Thuban.Model.session import Session  from Thuban.Model.session import Session
28  from Thuban.Model.map import Map  from Thuban.Model.map import Map
29  from Thuban.Model.layer import Layer  from Thuban.Model.layer import Layer
30  from Thuban.Model.color import Color  from Thuban.Model.color import Color
31  from Thuban.Model.proj import Projection  from Thuban.Model.proj import Projection
32  from Thuban.Model.classification import Classification, ClassData  from Thuban.Model.range import Range
33    from Thuban.Model.classification import Classification, \
34        ClassGroupDefault, ClassGroupSingleton, ClassGroupRange, ClassGroupMap, \
35        ClassGroupProperties
36    
37    
38  def parse_color(color):  def parse_color(color):
# Line 35  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 = 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 50  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 66  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):
78          """Inititialize the Sax handler.          self.chars = ''
79            self.__directory = ""
80            self.__dispatchers = {}
81    
82          The directory parameter should be the directory containing the      def read(self, file_or_filename):
83          session file. It's needed to interpret embedded relative  
84          filenames.          if hasattr(file_or_filename, "read"):
85                # it's a file object
86                self.__directory = ""
87                self.__file = file_or_filename
88            else:
89                filename = file_or_filename
90                self.__directory = os.path.dirname(filename)
91                self.__file = open(filename)
92    
93            parser = make_parser()
94            parser.setContentHandler(self)
95            parser.setErrorHandler(ErrorHandler())
96            parser.setFeature(xml.sax.handler.feature_namespaces, 1)
97    
98            #
99            # Well, this isn't pretty, but it appears that if you
100            # use Python 2.2 without the site-package _xmlplus then
101            # the following will fail, and without them it will work.
102            # However, if you do have the site-package and you don't
103            # call these functions, the reader raises an exception
104            #
105            # The reason we set these to 0 in the first place is
106            # because there is an unresolved issue with external
107            # entities causing an exception in the reader
108            #
109            try:
110                parser.setFeature(xml.sax.handler.feature_validation,0)
111                parser.setFeature(xml.sax.handler.feature_external_ges,0)
112                parser.setFeature(xml.sax.handler.feature_external_pes,0)
113            except SAXNotRecognizedException:
114                pass
115    
116            parser.parse(self.__file)
117    
118            self.close()
119    
120        def close(self):
121            self.__file.close()
122            
123        def GetFilename(self):
124            if hasattr(self.__file, "name"):
125                return self.__file.name
126    
127            return ""
128    
129        def GetDirectory(self):
130            return self.__directory
131    
132    
133        def AddDispatchers(self, dict):
134            """Add the function names that should be used to process XML tags.
135    
136            dict -- a dictionary whose keys are XML tag strings and whose values
137                    are pairs of strings such that the first string is
138                    the name of the function that should be called when the
139                    XML tag opens and the second string is the name of the
140                    function that should be called when the XML tag closes.
141                    If a pair element is None, no function is called.
142          """          """
143          self.directory = directory  
144          self.chars = ''          self.__dispatchers.update(dict)
         self.theSession = None  
         self.aMap = None  
         self.aLayer = None  
145    
146      def startElementNS(self, name, qname, attrs):      def startElementNS(self, name, qname, attrs):
147          """Call the method given for name in self.start_dispatcher          """Call the method given for name in self.start_dispatcher
148          """          """
149          if name[0] is None:          if name[0] is None:
150              method_name = self.start_dispatcher.get(name[1])              method_name = self.__dispatchers.get(name[1])
151          else:          else:
152              # Dispatch with namespace              # Dispatch with namespace
153              method_name = self.start_dispatcher.get(name)              method_name = self.__dispatchers.get(name)
154          if method_name is not None:          if method_name is not None and method_name[0] is not None:
155              getattr(self, method_name)(name, qname, attrs)              getattr(self, method_name[0])(name, qname, attrs)
156    
157      def endElementNS(self, name, qname):      def endElementNS(self, name, qname):
158          """Call the method given for name in self.end_dispatcher          """Call the method given for name in self.end_dispatcher
159          """          """
160          if name[0] is None:          if name[0] is None:
161              method_name = self.end_dispatcher.get(name[1])              method_name = self.__dispatchers.get(name[1])
162          else:          else:
163              # Dispatch with namespace              # Dispatch with namespace
164              method_name = self.end_dispatcher.get(name)              method_name = self.__dispatchers.get(name)
165          if method_name is not None:          if method_name is not None and method_name[1] is not None:
166              getattr(self, method_name)(name, qname)              getattr(self, method_name[1])(name, qname)
167    
168        def encode(self, str):
169            """Assume that str is in Unicode and encode it into Latin1.
170            
171            If str is None, return None
172            """
173    
174            if str is not None:
175                return str.encode("latin1")
176            else:
177                return None
178    
179    class SessionLoader(XMLReader):
180    
181        def __init__(self):
182            """Inititialize the Sax handler."""
183            XMLReader.__init__(self)
184    
185            self.theSession = None
186            self.aMap = None
187            self.aLayer = None
188    
189            XMLReader.AddDispatchers(self,
190                {'session'       : ("start_session",        "end_session"),
191                 'map'           : ("start_map",            "end_map"),
192                 'projection'    : ("start_projection",     "end_projection"),
193                 'parameter'     : ("start_parameter",      None),
194                 'layer'         : ("start_layer",          "end_layer"),
195                 'classification': ("start_classification", "end_classification"),
196                 'clnull'        : ("start_clnull",         "end_clnull"),
197                 'clpoint'       : ("start_clpoint",        "end_clpoint"),
198                 'clrange'       : ("start_clrange",        "end_clrange"),
199                 'cldata'        : ("start_cldata",         "end_cldata"),
200                 'table'         : ("start_table",          "end_table"),
201                 'labellayer'    : ("start_labellayer",     None),
202                 'label'         : ("start_label",          None)})
203    
204      def start_session(self, name, qname, attrs):      def start_session(self, name, qname, attrs):
205          self.theSession = Session(attrs.get((None, 'title'), None))          self.theSession = Session(self.encode(attrs.get((None, 'title'), None)))
     start_dispatcher['session'] = "start_session"  
206    
207      def end_session(self, name, qname):      def end_session(self, name, qname):
208          pass          pass
     end_dispatcher['session'] = "end_session"  
209    
210      def start_map(self, name, qname, attrs):      def start_map(self, name, qname, attrs):
211          """Start a map."""          """Start a map."""
212          self.aMap = Map(attrs.get((None, 'title'), None))          self.aMap = Map(attrs.get((None, 'title'), None))
     start_dispatcher['map'] = "start_map"  
213    
214      def end_map(self, name, qname):      def end_map(self, name, qname):
215          self.theSession.AddMap(self.aMap)          self.theSession.AddMap(self.aMap)
216      end_dispatcher['map'] = "end_map"          self.aMap = None
217    
218      def start_projection(self, name, qname, attrs):      def start_projection(self, name, qname, attrs):
219            self.ProjectionName = self.encode(attrs.get((None, 'name'), None))
220          self.ProjectionParams = [ ]          self.ProjectionParams = [ ]
     start_dispatcher['projection'] = "start_projection"  
221    
222      def end_projection(self, name, qname):      def end_projection(self, name, qname):
223          self.aMap.SetProjection(Projection(self.ProjectionParams))          if self.aLayer is not None:
224      end_dispatcher['projection'] = "end_projection"              obj = self.aLayer
225            elif self.aMap is not None:
226                obj = self.aMap
227            else:
228                assert False, "projection tag out of context"
229                pass
230    
231            obj.SetProjection(
232                Projection(self.ProjectionParams, self.ProjectionName))
233    
234      def start_parameter(self, name, qname, attrs):      def start_parameter(self, name, qname, attrs):
235          s = attrs.get((None, 'value'))          s = attrs.get((None, 'value'))
236          s = str(s) # we can't handle unicode in proj          s = str(s) # we can't handle unicode in proj
237          self.ProjectionParams.append(s)          self.ProjectionParams.append(s)
     start_dispatcher['parameter'] = "start_parameter"  
238    
239      def start_layer(self, name, qname, attrs, layer_class = Layer):      def start_layer(self, name, qname, attrs, layer_class = Layer):
240          """Start a layer          """Start a layer
# Line 139  class ProcessSession(xml.sax.handler.Con Line 243  class ProcessSession(xml.sax.handler.Con
243          attrs which may be a dictionary as well as the normal SAX attrs          attrs which may be a dictionary as well as the normal SAX attrs
244          object and bind it to self.aLayer.          object and bind it to self.aLayer.
245          """          """
246          title = attrs.get((None, 'title'), "")          title = self.encode(attrs.get((None, 'title'), ""))
247          filename = attrs.get((None, 'filename'), "")          filename = attrs.get((None, 'filename'), "")
248          filename = os.path.join(self.directory, filename)          filename = os.path.join(self.GetDirectory(), filename)
249            visible  = attrs.get((None, 'visible'), "true")
250          fill = parse_color(attrs.get((None, 'fill'), "None"))          fill = parse_color(attrs.get((None, 'fill'), "None"))
251          stroke = parse_color(attrs.get((None, 'stroke'), "#000000"))          stroke = parse_color(attrs.get((None, 'stroke'), "#000000"))
252          stroke_width = int(attrs.get((None, 'stroke_width'), "1"))          stroke_width = int(attrs.get((None, 'stroke_width'), "1"))
253          self.aLayer = layer_class(title, filename, fill = fill,          self.aLayer = layer_class(title,
254                                    stroke = stroke, stroke_width = stroke_width)                                    self.theSession.OpenShapefile(filename),
255      start_dispatcher['layer'] = "start_layer"                                    fill = fill, stroke = stroke,
256                                      lineWidth = stroke_width,
257                                      visible = visible != "false")
258    
259      def end_layer(self, name, qname):      def end_layer(self, name, qname):
260          self.aMap.AddLayer(self.aLayer)          self.aMap.AddLayer(self.aLayer)
261      end_dispatcher['layer'] = "end_layer"          self.aLayer = None
262    
263      def start_classification(self, name, qname, attrs):      def start_classification(self, name, qname, attrs):
264          self.aLayer.classification.SetField(attrs.get((None, 'field'), None))          field = attrs.get((None, 'field'), None)
265      start_dispatcher['classification'] = "start_classification"  
266            fieldType = attrs.get((None, 'field_type'), None)
267            dbFieldType = self.aLayer.GetFieldType(field)
268    
269            if fieldType != dbFieldType:
270                raise ValueError(_("xml field type differs from database!"))
271    
272            # setup conversion routines depending on the kind of data
273            # we will be seeing later on
274            if fieldType == FIELDTYPE_STRING:
275                self.conv = str
276            elif fieldType == FIELDTYPE_INT:
277                self.conv = lambda p: int(float(p))
278            elif fieldType == FIELDTYPE_DOUBLE:
279                self.conv = float
280    
281            self.aLayer.GetClassification().SetField(field)
282    
283      def end_classification(self, name, qname):      def end_classification(self, name, qname):
284          pass          pass
     end_dispatcher['classification'] = "end_classification"  
285    
286      def start_clnull(self, name, qname, attrs):      def start_clnull(self, name, qname, attrs):
287          self.cl_data = ClassData()          self.cl_group = ClassGroupDefault()
288      start_dispatcher['clnull'] = "start_clnull"          self.cl_group.SetLabel(self.encode(attrs.get((None, 'label'), "")))
289            self.cl_prop = ClassGroupProperties()
290    
291      def end_clnull(self, name, qname):      def end_clnull(self, name, qname):
292          self.aLayer.classification.SetDefaultData(self.cl_data)          self.cl_group.SetProperties(self.cl_prop)
293          del self.cl_data          self.aLayer.GetClassification().SetDefaultGroup(self.cl_group)
294      end_dispatcher['clnull'] = "end_clnull"          del self.cl_group, self.cl_prop
295    
296      def start_clpoint(self, name, qname, attrs):      def start_clpoint(self, name, qname, attrs):
297          attrib_value = attrs.get((None, 'value'), "0")          attrib_value = attrs.get((None, 'value'), "0")
298    
299          try:          value = self.conv(attrib_value)
300              self.cl_value  = int(attrib_value)  
301          except:          self.cl_group = ClassGroupSingleton(value)
302              self.cl_value  = attrib_value          self.cl_group.SetLabel(self.encode(attrs.get((None, 'label'), "")))
303            self.cl_prop = ClassGroupProperties()
304    
         self.cl_data = ClassData()  
     start_dispatcher['clpoint'] = "start_clpoint"  
305    
306      def end_clpoint(self, name, qname):      def end_clpoint(self, name, qname):
307          self.aLayer.classification.AddPoint(self.cl_value, self.cl_data)          self.cl_group.SetProperties(self.cl_prop)
308          del self.cl_value, self.cl_data          self.aLayer.GetClassification().AppendGroup(self.cl_group)
309      end_dispatcher['clpoint'] = "end_clpoint"          del self.cl_group, self.cl_prop
310    
311      def start_clrange(self, name, qname, attrs):      def start_clrange(self, name, qname, attrs):
312    
313            range = attrs.get((None, 'range'), None)
314            # for backward compatibility (min/max are not saved)
315            min   = attrs.get((None, 'min'), None)
316            max   = attrs.get((None, 'max'), None)
317    
318          try:          try:
319              self.cl_low = int(attrs.get((None, 'low'), "0"))              if range is not None:
320              self.cl_high = int(attrs.get((None, 'high'), "0"))                  self.cl_group = ClassGroupRange(Range(range))
321                elif min is not None and max is not None:
322                    self.cl_group = ClassGroupRange(self.conv(min), self.conv(max))
323                else:
324                    self.cl_group = ClassGroupRange(Range(None))
325    
326          except ValueError:          except ValueError:
327              raise ValueError(_("Classification range is not a number!"))              raise ValueError(_("Classification range is not a number!"))
328    
329          self.cl_data = ClassData()          self.cl_group.SetLabel(attrs.get((None, 'label'), ""))
330      start_dispatcher['clrange'] = "start_clrange"          self.cl_prop = ClassGroupProperties()
331    
332    
333      def end_clrange(self, name, qname):      def end_clrange(self, name, qname):
334          self.aLayer.classification.AddRange(          self.cl_group.SetProperties(self.cl_prop)
335              self.cl_low, self.cl_high, self.cl_data)          self.aLayer.GetClassification().AppendGroup(self.cl_group)
336          del self.cl_low, self.cl_high, self.cl_data          del self.cl_group, self.cl_prop
     end_dispatcher['clrange'] = "end_clrange"  
337    
338      def start_cldata(self, name, qname, attrs):      def start_cldata(self, name, qname, attrs):
339          self.cl_data.SetStroke(parse_color(attrs.get((None, 'stroke'), "None")))          self.cl_prop.SetLineColor(
340          self.cl_data.SetStrokeWidth(              parse_color(attrs.get((None, 'stroke'), "None")))
341            self.cl_prop.SetLineWidth(
342              int(attrs.get((None, 'stroke_width'), "0")))              int(attrs.get((None, 'stroke_width'), "0")))
343          self.cl_data.SetFill(parse_color(attrs.get((None, 'fill'), "None")))          self.cl_prop.SetFill(parse_color(attrs.get((None, 'fill'), "None")))
     start_dispatcher['cldata'] = "start_cldata"  
344    
345      def end_cldata(self, name, qname):      def end_cldata(self, name, qname):
346          pass          pass
     end_dispatcher['cldata'] = "end_cldata"  
347    
348      def start_table(self, name, qname, attrs):      def start_table(self, name, qname, attrs):
349          print "table title: %s" % attrs.get('title', None)          #print "table title: %s" % attrs.get('title', None)
350      start_dispatcher['table'] = "start_table"          pass
351    
352      def end_table(self, name, qname):      def end_table(self, name, qname):
353          pass          pass
     end_dispatcher['table'] = "end_table"  
354    
355      def start_labellayer(self, name, qname, attrs):      def start_labellayer(self, name, qname, attrs):
356          self.aLayer = self.aMap.LabelLayer()          self.aLayer = self.aMap.LabelLayer()
     start_dispatcher['labellayer'] = "start_labellayer"  
357    
358      def start_label(self, name, qname, attrs):      def start_label(self, name, qname, attrs):
359          x = float(attrs[(None, 'x')])          x = float(attrs[(None, 'x')])
360          y = float(attrs[(None, 'y')])          y = float(attrs[(None, 'y')])
361          text = attrs[(None, 'text')]          text = self.encode(attrs[(None, 'text')])
362          halign = attrs[(None, 'halign')]          halign = attrs[(None, 'halign')]
363          valign = attrs[(None, 'valign')]          valign = attrs[(None, 'valign')]
364          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"  
365    
366      def characters(self, chars):      def characters(self, chars):
367          pass          pass
# Line 241  class ProcessSession(xml.sax.handler.Con Line 369  class ProcessSession(xml.sax.handler.Con
369    
370  def load_session(filename):  def load_session(filename):
371      """Load a Thuban session from the file object file"""      """Load a Thuban session from the file object file"""
372      dir = os.path.dirname(filename)  
373      file = open(filename)      handler = SessionLoader()
374      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)  
375    
376      session = handler.theSession      session = handler.theSession
377      # Newly loaded session aren't modified      # Newly loaded session aren't modified
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