/[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 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]>
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    
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.range import Range
33  oldPython=0  from Thuban.Model.classification import Classification, \
34        ClassGroupDefault, ClassGroupSingleton, ClassGroupRange, ClassGroupMap, \
35  if not sys.__dict__.has_key("version_info"):      ClassGroupProperties
     # 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.__directory = ""
80            self.__dispatchers = {}
81    
82        def read(self, file_or_filename):
83    
84            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    
144            self.__dispatchers.update(dict)
145    
146        def startElementNS(self, name, qname, attrs):
147            """Call the method given for name in self.start_dispatcher
148            """
149            if name[0] is None:
150                method_name = self.__dispatchers.get(name[1])
151            else:
152                # Dispatch with namespace
153                method_name = self.__dispatchers.get(name)
154            if method_name is not None and method_name[0] is not None:
155                getattr(self, method_name[0])(name, qname, attrs)
156    
157        def endElementNS(self, name, qname):
158            """Call the method given for name in self.end_dispatcher
159            """
160            if name[0] is None:
161                method_name = self.__dispatchers.get(name[1])
162            else:
163                # Dispatch with namespace
164                method_name = self.__dispatchers.get(name)
165            if method_name is not None and method_name[1] is not None:
166                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          self.theSession = None
186          self.aMap = None          self.aMap = None
187          self.aLayer = None          self.aLayer = None
188    
189      def startElement(self, name, attrs):          XMLReader.AddDispatchers(self,
190          if name == 'session':              {'session'       : ("start_session",        "end_session"),
191              self.theSession = Session(attrs.get('title', None))               'map'           : ("start_map",            "end_map"),
192          elif name == 'map':               'projection'    : ("start_projection",     "end_projection"),
193              self.aMap = Map(attrs.get('title', None))               'parameter'     : ("start_parameter",      None),
194          elif name == 'projection':               'layer'         : ("start_layer",          "end_layer"),
195              self.ProjectionParams = [ ]               'classification': ("start_classification", "end_classification"),
196          elif name == 'parameter':               'clnull'        : ("start_clnull",         "end_clnull"),
197              self.ProjectionParams.append(attrs.get('value', None))               'clpoint'       : ("start_clpoint",        "end_clpoint"),
198          elif name == 'layer':               'clrange'       : ("start_clrange",        "end_clrange"),
199              title = attrs.get('title', "")               'cldata'        : ("start_cldata",         "end_cldata"),
200              filename = attrs.get('filename', "")               'table'         : ("start_table",          "end_table"),
201              filename = os.path.join(self.directory, filename)               'labellayer'    : ("start_labellayer",     None),
202              fill = parse_color(attrs.get('fill', "None"))               'label'         : ("start_label",          None)})
             stroke = parse_color(attrs.get('stroke', "#000000"))  
             stroke_width = int(attrs.get("stroke_width", "1"))  
             self.aLayer = Layer(title, filename, fill = fill, stroke = stroke,  
                                 stroke_width = stroke_width)  
         elif name == 'table':  
             print "table title: %s" % attrs.get('title', None)  
         elif name == 'labellayer':  
             self.aLayer = self.aMap.LabelLayer()  
         elif name == 'label':  
             x = float(attrs['x'])  
             y = float(attrs['y'])  
             text = attrs['text']  
             halign = attrs['halign']  
             valign = attrs['valign']  
             self.aLayer.AddLabel(x, y, text, halign = halign, valign = valign)  
           
203    
204      if not oldPython and test_for_broken_SAX():      def start_session(self, name, qname, attrs):
205          # works with python 2.0, but is not SAX compliant          self.theSession = Session(self.encode(attrs.get((None, 'title'), None)))
206          def characters(self, ch):  
207              self.my_characters(ch)      def end_session(self, name, qname):
208      else:          pass
209          # SAX compliant  
210          def characters(self, ch, start, length):      def start_map(self, name, qname, attrs):
211              self.my_characters(ch[start:start+length])          """Start a map."""
212            self.aMap = Map(attrs.get((None, 'title'), None))
213      def my_characters(self, ch):  
214          self.chars = self.chars + ch      def end_map(self, name, qname):
215            self.theSession.AddMap(self.aMap)
216      def endElement(self, name):          self.aMap = None
217          # If it's not a parameter element, ignore it  
218          if name == 'session':      def start_projection(self, name, qname, attrs):
219              #print "end of session"          self.ProjectionName = self.encode(attrs.get((None, 'name'), None))
220              pass          self.ProjectionParams = [ ]
221          if name == 'map':  
222              self.theSession.AddMap(self.aMap)      def end_projection(self, name, qname):
223          if name == 'projection':          if self.aLayer is not None:
224              self.aMap.SetProjection(Projection(self.ProjectionParams))              obj = self.aLayer
225          if name == 'layer':          elif self.aMap is not None:
226              self.aMap.AddLayer(self.aLayer)              obj = self.aMap
227          if name == 'table':          else:
228              #print "end of table"              assert False, "projection tag out of context"
229              pass              pass
230    
231            obj.SetProjection(
232                Projection(self.ProjectionParams, self.ProjectionName))
233    
234        def start_parameter(self, name, qname, attrs):
235            s = attrs.get((None, 'value'))
236            s = str(s) # we can't handle unicode in proj
237            self.ProjectionParams.append(s)
238    
239        def start_layer(self, name, qname, attrs, layer_class = Layer):
240            """Start a layer
241    
242            Instantiate a layer of class layer_class from the attributes in
243            attrs which may be a dictionary as well as the normal SAX attrs
244            object and bind it to self.aLayer.
245            """
246            title = self.encode(attrs.get((None, 'title'), ""))
247            filename = attrs.get((None, 'filename'), "")
248            filename = os.path.join(self.GetDirectory(), filename)
249            visible  = attrs.get((None, 'visible'), "true")
250            fill = parse_color(attrs.get((None, 'fill'), "None"))
251            stroke = parse_color(attrs.get((None, 'stroke'), "#000000"))
252            stroke_width = int(attrs.get((None, 'stroke_width'), "1"))
253            self.aLayer = layer_class(title,
254                                      self.theSession.OpenShapefile(filename),
255                                      fill = fill, stroke = stroke,
256                                      lineWidth = stroke_width,
257                                      visible = visible != "false")
258    
259        def end_layer(self, name, qname):
260            self.aMap.AddLayer(self.aLayer)
261            self.aLayer = None
262    
263        def start_classification(self, name, qname, attrs):
264            field = attrs.get((None, 'field'), None)
265    
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):
284            pass
285    
286        def start_clnull(self, name, qname, attrs):
287            self.cl_group = ClassGroupDefault()
288            self.cl_group.SetLabel(self.encode(attrs.get((None, 'label'), "")))
289            self.cl_prop = ClassGroupProperties()
290    
291        def end_clnull(self, name, qname):
292            self.cl_group.SetProperties(self.cl_prop)
293            self.aLayer.GetClassification().SetDefaultGroup(self.cl_group)
294            del self.cl_group, self.cl_prop
295    
296        def start_clpoint(self, name, qname, attrs):
297            attrib_value = attrs.get((None, 'value'), "0")
298    
299            value = self.conv(attrib_value)
300    
301            self.cl_group = ClassGroupSingleton(value)
302            self.cl_group.SetLabel(self.encode(attrs.get((None, 'label'), "")))
303            self.cl_prop = ClassGroupProperties()
304    
305    
306        def end_clpoint(self, name, qname):
307            self.cl_group.SetProperties(self.cl_prop)
308            self.aLayer.GetClassification().AppendGroup(self.cl_group)
309            del self.cl_group, self.cl_prop
310    
311        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:
319                if range is not None:
320                    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:
327                raise ValueError(_("Classification range is not a number!"))
328    
329            self.cl_group.SetLabel(attrs.get((None, 'label'), ""))
330            self.cl_prop = ClassGroupProperties()
331    
332    
333        def end_clrange(self, name, qname):
334            self.cl_group.SetProperties(self.cl_prop)
335            self.aLayer.GetClassification().AppendGroup(self.cl_group)
336            del self.cl_group, self.cl_prop
337    
338        def start_cldata(self, name, qname, attrs):
339            self.cl_prop.SetLineColor(
340                parse_color(attrs.get((None, 'stroke'), "None")))
341            self.cl_prop.SetLineWidth(
342                int(attrs.get((None, 'stroke_width'), "0")))
343            self.cl_prop.SetFill(parse_color(attrs.get((None, 'fill'), "None")))
344    
345        def end_cldata(self, name, qname):
346            pass
347    
348        def start_table(self, name, qname, attrs):
349            #print "table title: %s" % attrs.get('title', None)
350            pass
351    
352        def end_table(self, name, qname):
353            pass
354    
355        def start_labellayer(self, name, qname, attrs):
356            self.aLayer = self.aMap.LabelLayer()
357    
358        def start_label(self, name, qname, attrs):
359            x = float(attrs[(None, 'x')])
360            y = float(attrs[(None, 'y')])
361            text = self.encode(attrs[(None, 'text')])
362            halign = attrs[(None, 'halign')]
363            valign = attrs[(None, 'valign')]
364            self.aLayer.AddLabel(x, y, text, halign = halign, valign = valign)
365    
366        def characters(self, chars):
367            pass
368    
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"""
     dir = os.path.dirname(filename)  
     file = open(filename)  
     handler = ProcessSession(dir)  
372    
373      if oldPython:      handler = SessionLoader()
374          parser = make_parser()      handler.read(filename)
375          parser.setDocumentHandler(handler)  
         parser.setErrorHandler(saxutils.ErrorPrinter())  
         parser.parseFile(file)  
         parser.close()  
     else:  
         xml.sax.parse(file,handler)  
376      session = handler.theSession      session = handler.theSession
377      # Newly loaded session aren't modified      # Newly loaded session aren't modified
378      session.UnsetModified()      session.UnsetModified()
379    
380      return session      return session
381    
 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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