/[thuban]/branches/WIP-pyshapelib-bramz/Thuban/Model/load.py
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revision 75 by bh, Mon Feb 4 19:22:22 2002 UTC revision 737 by jonathan, Fri Apr 25 09:12:17 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]>
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 11  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
19    import xml.sax.handler
20    from xml.sax import make_parser, ErrorHandler, SAXNotRecognizedException
21    
22    from Thuban import _
23    from Thuban.common import *
24    
25    from Thuban.Model.table import FIELDTYPE_INT, FIELDTYPE_DOUBLE, \
26         FIELDTYPE_STRING
27    
28  from Thuban.Model.session import Session  from Thuban.Model.session import Session
29  from Thuban.Model.map import Map  from Thuban.Model.map import Map
30  from Thuban.Model.layer import Layer  from Thuban.Model.layer import Layer
31  from Thuban.Model.color import Color  from Thuban.Model.color import Color
32  from Thuban.Model.proj import Projection  from Thuban.Model.proj import Projection
33    from Thuban.Model.classification import Classification, \
34  oldPython=0      ClassGroupDefault, ClassGroupSingleton, ClassGroupRange, ClassGroupMap, \
35        ClassGroupProperties
 if not sys.__dict__.has_key("version_info"):  
     # We can assume to have python 1.5.2 or lower here now  
     oldPython=1  
   
 if oldPython:  
     try:  
         from xml.sax.saxexts import make_parser  
         from xml.sax.saxlib import HandlerBase  
         from xml.sax import saxutils  
     except ImportError:  
         sys.stdout.write(("You need to have Python-XML installed or"  
                           " a modern Python!\n"  
                           "Check www.python.org/sigs/xml-sig/\n\n"))  
         raise  
 else:  
     # Do the python 2.0 standard xml thing and map it on the old names  
     import xml.sax  
     import xml.sax.handler  
     HandlerBase=xml.sax.handler.ContentHandler  
     from xml.sax import make_parser  
   
 class testSAXContentHandler(HandlerBase):  
 # SAX compliant  
     def characters(self, ch, start, length):  
         pass  
       
 def test_for_broken_SAX():  
     ch=testSAXContentHandler()  
     try:  
         xml.sax.parseString("""<?xml version="1.0"?>  
             <child1 name="paul">Text goes here</child1>  
         """,ch)  
     except TypeError:  
         return 1  
     return 0  
36    
37    
38  def parse_color(color):  def parse_color(color):
39      """      """Return the color object for the string color.
40      Return the color object for the string color. Color may be either  
41      'None' or of the form '#RRGGBB' in the usual HTML color notation      Color may be either 'None' or of the form '#RRGGBB' in the usual
42        HTML color notation
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 72  def parse_color(color): Line 51  def parse_color(color):
51              b = string.atoi(color[5:7], 16) / 255.0              b = string.atoi(color[5:7], 16) / 255.0
52              result = Color(r, g, b)              result = Color(r, g, b)
53          else:          else:
54              raise ValueError("Invalid hexadecimal color specification %s"              raise ValueError(_("Invalid hexadecimal color specification %s")
55                               % color)                               % color)
56      else:      else:
57          raise ValueError("Invalid color specification %s" % color)          raise ValueError(_("Invalid color specification %s") % color)
58      return result      return result
59    
60    
61  class ProcessSession(HandlerBase):  class XMLReader(xml.sax.handler.ContentHandler):
62    
63      def __init__(self, directory):      # Dictionary mapping element names (or (URI, element name) pairs for
64          """Inititialize the Sax handler.      # documents using namespaces) to method names. The methods should
65        # accept the same parameters as the startElement (or startElementNS)
66        # methods. The start_dispatcher is used by the default startElement
67        # and startElementNS methods to call a method for the open tag of an
68        # element.
69        start_dispatcher = {}
70    
71        # end_dispatcher works just like start_dispatcher but it's used by
72        # endElement and endElementNS. The method whose names it maps to
73        # should accept the same parameters as endElement and endElementNS.
74        end_dispatcher = {}
75    
76          directory is the directory containing the session file. It's  
77          needed to interpret embedded relative filenames      def __init__(self):
         """  
         self.directory = directory  
78          self.chars = ''          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    
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):
149            """Call the method given for name in self.start_dispatcher
150            """
151            if name[0] is None:
152                method_name = self.__dispatchers.get(name[1])
153            else:
154                # Dispatch with namespace
155                method_name = self.__dispatchers.get(name)
156            if method_name is not None and method_name[0] is not None:
157                getattr(self, method_name[0])(name, qname, attrs)
158    
159        def endElementNS(self, name, qname):
160            """Call the method given for name in self.end_dispatcher
161            """
162            if name[0] is None:
163                method_name = self.__dispatchers.get(name[1])
164            else:
165                # Dispatch with namespace
166                method_name = self.__dispatchers.get(name)
167            if method_name is not None and method_name[1] is not None:
168                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          self.theSession = None
177          self.aMap = None          self.aMap = None
178          self.aLayer = None          self.aLayer = None
179    
180      def startElement(self, name, attrs):          XMLReader.AddDispatchers(self,
181          if name == 'session':              {'session'       : ("start_session",        "end_session"),
182              self.theSession = Session(attrs.get('title', None))               'map'           : ("start_map",            "end_map"),
183          elif name == 'map':               'projection'    : ("start_projection",     "end_projection"),
184              self.aMap = Map(attrs.get('title', None))               'parameter'     : ("start_parameter",      None),
185          elif name == 'projection':               'layer'         : ("start_layer",          "end_layer"),
186              self.ProjectionParams = [ ]               'classification': ("start_classification", "end_classification"),
187          elif name == 'parameter':               'clnull'        : ("start_clnull",         "end_clnull"),
188              self.ProjectionParams.append(attrs.get('value', None))               'clpoint'       : ("start_clpoint",        "end_clpoint"),
189          elif name == 'layer':               'clrange'       : ("start_clrange",        "end_clrange"),
190              title = attrs.get('title', "")               'cldata'        : ("start_cldata",         "end_cldata"),
191              filename = attrs.get('filename', "")               'table'         : ("start_table",          "end_table"),
192              filename = os.path.join(self.directory, filename)               'labellayer'    : ("start_labellayer",     None),
193              fill = parse_color(attrs.get('fill', "None"))               'label'         : ("start_label",          None)})
194              stroke = parse_color(attrs.get('stroke', "#000000"))  
195              stroke_width = int(attrs.get("stroke_width", "1"))      def start_session(self, name, qname, attrs):
196              self.aLayer = Layer(title, filename, fill = fill, stroke = stroke,          self.theSession = Session(attrs.get((None, 'title'), None))
197                                  stroke_width = stroke_width)  
198          elif name == 'table':      def end_session(self, name, qname):
199              print "table title: %s" % attrs.get('title', None)          pass
200          elif name == 'labellayer':  
201              self.aLayer = self.aMap.LabelLayer()      def start_map(self, name, qname, attrs):
202          elif name == 'label':          """Start a map."""
203              x = float(attrs['x'])          self.aMap = Map(attrs.get((None, 'title'), None))
204              y = float(attrs['y'])          self.__projReceiver = self.aMap
205              text = attrs['text']  
206              halign = attrs['halign']      def end_map(self, name, qname):
207              valign = attrs['valign']          self.theSession.AddMap(self.aMap)
208              self.aLayer.AddLabel(x, y, text, halign = halign, valign = valign)          self.__projReceiver = None
209            
210        def start_projection(self, name, qname, attrs):
211            self.ProjectionParams = [ ]
212    
213        def end_projection(self, name, qname):
214            self.__projReceiver.SetProjection(Projection(self.ProjectionParams))
215    
216        def start_parameter(self, name, qname, attrs):
217            s = attrs.get((None, 'value'))
218            s = str(s) # we can't handle unicode in proj
219            self.ProjectionParams.append(s)
220    
221        def start_layer(self, name, qname, attrs, layer_class = Layer):
222            """Start a layer
223    
224            Instantiate a layer of class layer_class from the attributes in
225            attrs which may be a dictionary as well as the normal SAX attrs
226            object and bind it to self.aLayer.
227            """
228            title = attrs.get((None, 'title'), "")
229            filename = attrs.get((None, 'filename'), "")
230            filename = os.path.join(self.GetDirectory(), filename)
231            fill = parse_color(attrs.get((None, 'fill'), "None"))
232            stroke = parse_color(attrs.get((None, 'stroke'), "#000000"))
233            stroke_width = int(attrs.get((None, 'stroke_width'), "1"))
234            self.aLayer = layer_class(title,
235                                      self.theSession.OpenShapefile(filename),
236                                      fill = fill, stroke = stroke,
237                                      lineWidth = stroke_width)
238    
239            self.__projReceiver = self.aLayer
240    
241        def end_layer(self, name, qname):
242            self.aMap.AddLayer(self.aLayer)
243            self.__projReceiver = None
244    
245        def start_classification(self, name, qname, attrs):
246            field = attrs.get((None, 'field'), None)
247    
248            fieldType = attrs.get((None, 'field_type'), None)
249            dbFieldType = self.aLayer.GetFieldType(field)
250    
251            if fieldType != dbFieldType:
252                raise ValueError(_("xml field type differs from database!"))
253    
254            # setup conversion routines depending on the kind of data
255            # we will be seeing later on
256            if fieldType == FIELDTYPE_STRING:
257                self.conv = str
258            elif fieldType == FIELDTYPE_INT:
259                self.conv = lambda p: int(float(p))
260            elif fieldType == FIELDTYPE_DOUBLE:
261                self.conv = float
262    
263            self.aLayer.GetClassification().SetField(field)
264    
265    
266        def end_classification(self, name, qname):
267            pass
268    
269        def start_clnull(self, name, qname, attrs):
270            self.cl_group = ClassGroupDefault()
271            self.cl_group.SetLabel(attrs.get((None, 'label'), ""))
272            self.cl_prop = ClassGroupProperties()
273    
274        def end_clnull(self, name, qname):
275            self.cl_group.SetProperties(self.cl_prop)
276            self.aLayer.GetClassification().SetDefaultGroup(self.cl_group)
277            del self.cl_group, self.cl_prop
278    
279        def start_clpoint(self, name, qname, attrs):
280            attrib_value = attrs.get((None, 'value'), "0")
281    
282            #try:
283                #value  = Str2Num(attrib_value)
284            #except:
285                #value  = attrib_value
286    
287            value = self.conv(attrib_value)
288    
289            self.cl_group = ClassGroupSingleton(value)
290            self.cl_group.SetLabel(attrs.get((None, 'label'), ""))
291            self.cl_prop = ClassGroupProperties()
292    
293    
294        def end_clpoint(self, name, qname):
295            self.cl_group.SetProperties(self.cl_prop)
296            self.aLayer.GetClassification().AppendGroup(self.cl_group)
297            del self.cl_group, self.cl_prop
298    
299        def start_clrange(self, name, qname, attrs):
300    
301            try:
302                min = self.conv(attrs.get((None, 'min'), "0"))
303                max = self.conv(attrs.get((None, 'max'), "0"))
304                #min = Str2Num(attrs.get((None, 'min'), "0"))
305                #max = Str2Num(attrs.get((None, 'max'), "0"))
306            except ValueError:
307                raise ValueError(_("Classification range is not a number!"))
308    
309            self.cl_group = ClassGroupRange(min, max)
310            self.cl_group.SetLabel(attrs.get((None, 'label'), ""))
311            self.cl_prop = ClassGroupProperties()
312    
313    
314        def end_clrange(self, name, qname):
315            self.cl_group.SetProperties(self.cl_prop)
316            self.aLayer.GetClassification().AppendGroup(self.cl_group)
317            del self.cl_group, self.cl_prop
318    
319        def start_cldata(self, name, qname, attrs):
320            self.cl_prop.SetLineColor(
321                parse_color(attrs.get((None, 'stroke'), "None")))
322            self.cl_prop.SetLineWidth(
323                int(attrs.get((None, 'stroke_width'), "0")))
324            self.cl_prop.SetFill(parse_color(attrs.get((None, 'fill'), "None")))
325    
326        def end_cldata(self, name, qname):
327            pass
328    
329        def start_table(self, name, qname, attrs):
330            #print "table title: %s" % attrs.get('title', None)
331            pass
332    
333        def end_table(self, name, qname):
334            pass
335    
336        def start_labellayer(self, name, qname, attrs):
337            self.aLayer = self.aMap.LabelLayer()
338    
339        def start_label(self, name, qname, attrs):
340            x = float(attrs[(None, 'x')])
341            y = float(attrs[(None, 'y')])
342            text = attrs[(None, 'text')]
343            halign = attrs[(None, 'halign')]
344            valign = attrs[(None, 'valign')]
345            self.aLayer.AddLabel(x, y, text, halign = halign, valign = valign)
346    
347        def characters(self, chars):
348            pass
349    
     if not oldPython and test_for_broken_SAX():  
         # works with python 2.0, but is not SAX compliant  
         def characters(self, ch):  
             self.my_characters(ch)  
     else:  
         # SAX compliant  
         def characters(self, ch, start, length):  
             self.my_characters(ch[start:start+length])  
   
     def my_characters(self, ch):  
         self.chars = self.chars + ch  
   
     def endElement(self, name):  
         # If it's not a parameter element, ignore it  
         if name == 'session':  
             #print "end of session"  
             pass  
         if name == 'map':  
             self.theSession.AddMap(self.aMap)  
         if name == 'projection':  
             self.aMap.SetProjection(Projection(self.ProjectionParams))  
         if name == 'layer':  
             self.aMap.AddLayer(self.aLayer)  
         if name == 'table':  
             #print "end of table"  
             pass  
350    
351  def load_session(filename):  def load_session(filename):
352      """Load a Thuban session from the file object file"""      """Load a Thuban session from the file object file"""
353      dir = os.path.dirname(filename)  
354      file = open(filename)      handler = SessionLoader()
355      handler = ProcessSession(dir)      handler.read(filename)
356    
     if oldPython:  
         parser = make_parser()  
         parser.setDocumentHandler(handler)  
         parser.setErrorHandler(saxutils.ErrorPrinter())  
         parser.parseFile(file)  
         parser.close()  
     else:  
         xml.sax.parse(file,handler)  
357      session = handler.theSession      session = handler.theSession
358      # Newly loaded session aren't modified      # Newly loaded session aren't modified
359      session.UnsetModified()      session.UnsetModified()
360    
361      return session      return session
362    
 if __name__ == "__main__":  
     # find out the command to run  
     if len(sys.argv) > 1:  
         print "usage: cat <file> | " + sys.argv[0]  
     else:  
         parseSession(sys.stdin)  
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