/[thuban]/branches/WIP-pyshapelib-bramz/Thuban/Model/load.py
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revision 525 by jonathan, Wed Mar 12 19:12:30 2003 UTC revision 1159 by jonathan, Thu Jun 12 12:40:27 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
20  from xml.sax import make_parser, ErrorHandler  from xml.sax import make_parser, ErrorHandler, SAXNotRecognizedException
21    
22  from Thuban import _  from Thuban import _
 from Thuban.common import *  
23    
24  from Thuban.Model.table import FIELDTYPE_INT, FIELDTYPE_DOUBLE, \  from Thuban.Model.table import FIELDTYPE_INT, FIELDTYPE_DOUBLE, \
25       FIELDTYPE_STRING       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, RasterLayer
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.range import Range
33  from Thuban.Model.classification import Classification, \  from Thuban.Model.classification import Classification, \
34      ClassGroupDefault, ClassGroupSingleton, ClassGroupRange, ClassGroupMap, \      ClassGroupDefault, ClassGroupSingleton, ClassGroupRange, ClassGroupMap, \
35      ClassGroupProperties      ClassGroupProperties
36    
37    from Thuban.Model.xmlreader import XMLReader
38    import resource
39    
40  def parse_color(color):  def parse_color(color):
41      """Return the color object for the string color.      """Return the color object for the string color.
# Line 43  def parse_color(color): Line 45  def parse_color(color):
45      """      """
46      color = string.strip(color)      color = string.strip(color)
47      if color == "None":      if color == "None":
48          result = Color.None          result = Color.Transparent
49      elif color[0] == '#':      elif color[0] == '#':
50          if len(color) == 7:          if len(color) == 7:
51              r = string.atoi(color[1:3], 16) / 255.0              r = string.atoi(color[1:3], 16) / 255.0
# Line 57  def parse_color(color): Line 59  def parse_color(color):
59          raise ValueError(_("Invalid color specification %s") % color)          raise ValueError(_("Invalid color specification %s") % color)
60      return result      return result
61    
62    class SessionLoader(XMLReader):
63    
64  class ProcessSession(xml.sax.handler.ContentHandler):      def __init__(self):
65            """Inititialize the Sax handler."""
66            XMLReader.__init__(self)
67    
     # Dictionary mapping element names (or (URI, element name) pairs for  
     # documents using namespaces) to method names. The methods should  
     # accept the same parameters as the startElement (or startElementNS)  
     # methods. The start_dispatcher is used by the default startElement  
     # and startElementNS methods to call a method for the open tag of an  
     # element.  
     start_dispatcher = {}  
   
     # end_dispatcher works just like start_dispatcher but it's used by  
     # endElement and endElementNS. The method whose names it maps to  
     # should accept the same parameters as endElement and endElementNS.  
     end_dispatcher = {}  
   
   
     def __init__(self, directory):  
         """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  
         self.chars = ''  
68          self.theSession = None          self.theSession = None
69          self.aMap = None          self.aMap = None
70          self.aLayer = None          self.aLayer = None
71    
72      def startElementNS(self, name, qname, attrs):          XMLReader.AddDispatchers(self,
73          """Call the method given for name in self.start_dispatcher              {'session'       : ("start_session",        "end_session"),
74          """               'map'           : ("start_map",            "end_map"),
75          if name[0] is None:               'projection'    : ("start_projection",     "end_projection"),
76              method_name = self.start_dispatcher.get(name[1])               'parameter'     : ("start_parameter",      None),
77          else:               'layer'         : ("start_layer",          "end_layer"),
78              # Dispatch with namespace               'rasterlayer'   : ("start_rasterlayer",    "end_rasterlayer"),
79              method_name = self.start_dispatcher.get(name)               'classification': ("start_classification", "end_classification"),
80          if method_name is not None:               'clnull'        : ("start_clnull",         "end_clnull"),
81              getattr(self, method_name)(name, qname, attrs)               'clpoint'       : ("start_clpoint",        "end_clpoint"),
82                 'clrange'       : ("start_clrange",        "end_clrange"),
83      def endElementNS(self, name, qname):               'cldata'        : ("start_cldata",         "end_cldata"),
84          """Call the method given for name in self.end_dispatcher               'table'         : ("start_table",          "end_table"),
85          """               'labellayer'    : ("start_labellayer",     None),
86          if name[0] is None:               'label'         : ("start_label",          None)})
             method_name = self.end_dispatcher.get(name[1])  
         else:  
             # Dispatch with namespace  
             method_name = self.end_dispatcher.get(name)  
         if method_name is not None:  
             getattr(self, method_name)(name, qname)  
87    
88      def start_session(self, name, qname, attrs):      def start_session(self, name, qname, attrs):
89          self.theSession = Session(attrs.get((None, 'title'), None))          self.theSession = Session(self.encode(attrs.get((None, 'title'), None)))
     start_dispatcher['session'] = "start_session"  
90    
91      def end_session(self, name, qname):      def end_session(self, name, qname):
92          pass          pass
     end_dispatcher['session'] = "end_session"  
93    
94      def start_map(self, name, qname, attrs):      def start_map(self, name, qname, attrs):
95          """Start a map."""          """Start a map."""
96          self.aMap = Map(attrs.get((None, 'title'), None))          self.aMap = Map(attrs.get((None, 'title'), None))
     start_dispatcher['map'] = "start_map"  
97    
98      def end_map(self, name, qname):      def end_map(self, name, qname):
99          self.theSession.AddMap(self.aMap)          self.theSession.AddMap(self.aMap)
100      end_dispatcher['map'] = "end_map"          self.aMap = None
101    
102      def start_projection(self, name, qname, attrs):      def start_projection(self, name, qname, attrs):
103            self.ProjectionName = self.encode(attrs.get((None, 'name'), None))
104          self.ProjectionParams = [ ]          self.ProjectionParams = [ ]
     start_dispatcher['projection'] = "start_projection"  
105    
106      def end_projection(self, name, qname):      def end_projection(self, name, qname):
107          self.aMap.SetProjection(Projection(self.ProjectionParams))          if self.aLayer is not None:
108      end_dispatcher['projection'] = "end_projection"              obj = self.aLayer
109            elif self.aMap is not None:
110                obj = self.aMap
111            else:
112                assert False, "projection tag out of context"
113                pass
114    
115            obj.SetProjection(
116                Projection(self.ProjectionParams, self.ProjectionName))
117    
118      def start_parameter(self, name, qname, attrs):      def start_parameter(self, name, qname, attrs):
119          s = attrs.get((None, 'value'))          s = attrs.get((None, 'value'))
120          s = str(s) # we can't handle unicode in proj          s = str(s) # we can't handle unicode in proj
121          self.ProjectionParams.append(s)          self.ProjectionParams.append(s)
     start_dispatcher['parameter'] = "start_parameter"  
122    
123      def start_layer(self, name, qname, attrs, layer_class = Layer):      def start_layer(self, name, qname, attrs, layer_class = Layer):
124          """Start a layer          """Start a layer
# Line 147  class ProcessSession(xml.sax.handler.Con Line 127  class ProcessSession(xml.sax.handler.Con
127          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
128          object and bind it to self.aLayer.          object and bind it to self.aLayer.
129          """          """
130          title = attrs.get((None, 'title'), "")          title = self.encode(attrs.get((None, 'title'), ""))
131          filename = attrs.get((None, 'filename'), "")          filename = attrs.get((None, 'filename'), "")
132          filename = os.path.join(self.directory, filename)          filename = os.path.join(self.GetDirectory(), filename)
133            filename = self.encode(filename)
134            visible  = self.encode(attrs.get((None, 'visible'), "true")) != "false"
135          fill = parse_color(attrs.get((None, 'fill'), "None"))          fill = parse_color(attrs.get((None, 'fill'), "None"))
136          stroke = parse_color(attrs.get((None, 'stroke'), "#000000"))          stroke = parse_color(attrs.get((None, 'stroke'), "#000000"))
137          stroke_width = int(attrs.get((None, 'stroke_width'), "1"))          stroke_width = int(attrs.get((None, 'stroke_width'), "1"))
138          self.aLayer = layer_class(title, filename, fill = fill,          self.aLayer = layer_class(title,
139                                    stroke = stroke, lineWidth = stroke_width)                                    self.theSession.OpenShapefile(filename),
140      start_dispatcher['layer'] = "start_layer"                                    fill = fill, stroke = stroke,
141                                      lineWidth = stroke_width,
142                                      visible = visible)
143    
144      def end_layer(self, name, qname):      def end_layer(self, name, qname):
145          self.aMap.AddLayer(self.aLayer)          self.aMap.AddLayer(self.aLayer)
146      end_dispatcher['layer'] = "end_layer"          self.aLayer = None
147    
148        def start_rasterlayer(self, name, qname, attrs, layer_class = RasterLayer):
149            title = self.encode(attrs.get((None, 'title'), ""))
150            filename = attrs.get((None, 'filename'), "")
151            filename = os.path.join(self.GetDirectory(), filename)
152            filename = self.encode(filename)
153            visible  = self.encode(attrs.get((None, 'visible'), "true")) != "false"
154    
155            self.aLayer = layer_class(title, filename, visible = visible)
156    
157        def end_rasterlayer(self, name, qname):
158            self.aMap.AddLayer(self.aLayer)
159            self.aLayer = None
160    
161      def start_classification(self, name, qname, attrs):      def start_classification(self, name, qname, attrs):
162          field = attrs.get((None, 'field'), None)          field = attrs.get((None, 'field'), None)
# Line 181  class ProcessSession(xml.sax.handler.Con Line 178  class ProcessSession(xml.sax.handler.Con
178    
179          self.aLayer.GetClassification().SetField(field)          self.aLayer.GetClassification().SetField(field)
180    
     start_dispatcher['classification'] = "start_classification"  
   
181      def end_classification(self, name, qname):      def end_classification(self, name, qname):
182          pass          pass
     end_dispatcher['classification'] = "end_classification"  
183    
184      def start_clnull(self, name, qname, attrs):      def start_clnull(self, name, qname, attrs):
185          self.cl_group = ClassGroupDefault()          self.cl_group = ClassGroupDefault()
186          self.cl_group.SetLabel(attrs.get((None, 'label'), ""))          self.cl_group.SetLabel(self.encode(attrs.get((None, 'label'), "")))
187          self.cl_prop = ClassGroupProperties()          self.cl_prop = ClassGroupProperties()
     start_dispatcher['clnull'] = "start_clnull"  
188    
189      def end_clnull(self, name, qname):      def end_clnull(self, name, qname):
190          self.cl_group.SetProperties(self.cl_prop)          self.cl_group.SetProperties(self.cl_prop)
191          self.aLayer.GetClassification().SetDefaultGroup(self.cl_group)          self.aLayer.GetClassification().SetDefaultGroup(self.cl_group)
192          del self.cl_group, self.cl_prop          del self.cl_group, self.cl_prop
     end_dispatcher['clnull'] = "end_clnull"  
193    
194      def start_clpoint(self, name, qname, attrs):      def start_clpoint(self, name, qname, attrs):
195          attrib_value = attrs.get((None, 'value'), "0")          attrib_value = attrs.get((None, 'value'), "0")
196    
         #try:  
             #value  = Str2Num(attrib_value)  
         #except:  
             #value  = attrib_value  
   
197          value = self.conv(attrib_value)          value = self.conv(attrib_value)
198    
199          self.cl_group = ClassGroupSingleton(value)          self.cl_group = ClassGroupSingleton(value)
200          self.cl_group.SetLabel(attrs.get((None, 'label'), ""))          self.cl_group.SetLabel(self.encode(attrs.get((None, 'label'), "")))
201          self.cl_prop = ClassGroupProperties()          self.cl_prop = ClassGroupProperties()
202    
     start_dispatcher['clpoint'] = "start_clpoint"  
203    
204      def end_clpoint(self, name, qname):      def end_clpoint(self, name, qname):
205          self.cl_group.SetProperties(self.cl_prop)          self.cl_group.SetProperties(self.cl_prop)
206          self.aLayer.GetClassification().AddGroup(self.cl_group)          self.aLayer.GetClassification().AppendGroup(self.cl_group)
207          del self.cl_group, self.cl_prop          del self.cl_group, self.cl_prop
     end_dispatcher['clpoint'] = "end_clpoint"  
208    
209      def start_clrange(self, name, qname, attrs):      def start_clrange(self, name, qname, attrs):
210    
211            range = attrs.get((None, 'range'), None)
212            # for backward compatibility (min/max are not saved)
213            min   = attrs.get((None, 'min'), None)
214            max   = attrs.get((None, 'max'), None)
215    
216          try:          try:
217              min = self.conv(attrs.get((None, 'min'), "0"))              if range is not None:
218              max = self.conv(attrs.get((None, 'max'), "0"))                  self.cl_group = ClassGroupRange(Range(range))
219              #min = Str2Num(attrs.get((None, 'min'), "0"))              elif min is not None and max is not None:
220              #max = Str2Num(attrs.get((None, 'max'), "0"))                  self.cl_group = ClassGroupRange(self.conv(min), self.conv(max))
221                else:
222                    self.cl_group = ClassGroupRange(Range(None))
223    
224          except ValueError:          except ValueError:
225              raise ValueError(_("Classification range is not a number!"))              raise ValueError(_("Classification range is not a number!"))
226    
         self.cl_group = ClassGroupRange(min, max)  
227          self.cl_group.SetLabel(attrs.get((None, 'label'), ""))          self.cl_group.SetLabel(attrs.get((None, 'label'), ""))
228          self.cl_prop = ClassGroupProperties()          self.cl_prop = ClassGroupProperties()
229    
     start_dispatcher['clrange'] = "start_clrange"  
230    
231      def end_clrange(self, name, qname):      def end_clrange(self, name, qname):
232          self.cl_group.SetProperties(self.cl_prop)          self.cl_group.SetProperties(self.cl_prop)
233          self.aLayer.GetClassification().AddGroup(self.cl_group)          self.aLayer.GetClassification().AppendGroup(self.cl_group)
234          del self.cl_group, self.cl_prop          del self.cl_group, self.cl_prop
     end_dispatcher['clrange'] = "end_clrange"  
235    
236      def start_cldata(self, name, qname, attrs):      def start_cldata(self, name, qname, attrs):
237          self.cl_prop.SetLineColor(          self.cl_prop.SetLineColor(
# Line 249  class ProcessSession(xml.sax.handler.Con Line 239  class ProcessSession(xml.sax.handler.Con
239          self.cl_prop.SetLineWidth(          self.cl_prop.SetLineWidth(
240              int(attrs.get((None, 'stroke_width'), "0")))              int(attrs.get((None, 'stroke_width'), "0")))
241          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"  
242    
243      def end_cldata(self, name, qname):      def end_cldata(self, name, qname):
244          pass          pass
     end_dispatcher['cldata'] = "end_cldata"  
245    
246      def start_table(self, name, qname, attrs):      def start_table(self, name, qname, attrs):
247          #print "table title: %s" % attrs.get('title', None)          #print "table title: %s" % attrs.get('title', None)
248          pass          pass
     start_dispatcher['table'] = "start_table"  
249    
250      def end_table(self, name, qname):      def end_table(self, name, qname):
251          pass          pass
     end_dispatcher['table'] = "end_table"  
252    
253      def start_labellayer(self, name, qname, attrs):      def start_labellayer(self, name, qname, attrs):
254          self.aLayer = self.aMap.LabelLayer()          self.aLayer = self.aMap.LabelLayer()
     start_dispatcher['labellayer'] = "start_labellayer"  
255    
256      def start_label(self, name, qname, attrs):      def start_label(self, name, qname, attrs):
257          x = float(attrs[(None, 'x')])          x = float(attrs[(None, 'x')])
258          y = float(attrs[(None, 'y')])          y = float(attrs[(None, 'y')])
259          text = attrs[(None, 'text')]          text = self.encode(attrs[(None, 'text')])
260          halign = attrs[(None, 'halign')]          halign = attrs[(None, 'halign')]
261          valign = attrs[(None, 'valign')]          valign = attrs[(None, 'valign')]
262          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"  
263    
264      def characters(self, chars):      def characters(self, chars):
265          pass          pass
# Line 283  class ProcessSession(xml.sax.handler.Con Line 267  class ProcessSession(xml.sax.handler.Con
267    
268  def load_session(filename):  def load_session(filename):
269      """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  
     #  
     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  
270    
271      parser.parse(file)      handler = SessionLoader()
272        handler.read(filename)
273    
274      session = handler.theSession      session = handler.theSession
275      # Newly loaded session aren't modified      # Newly loaded session aren't modified
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