/[thuban]/branches/WIP-pyshapelib-bramz/Thuban/Model/save.py
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revision 876 by jonathan, Fri May 9 16:31:55 2003 UTC revision 1219 by bh, Mon Jun 16 17:42:54 2003 UTC
# Line 13  Functions to save a session to a file Line 13  Functions to save a session to a file
13    
14  __version__ = "$Revision$"  __version__ = "$Revision$"
15    
 # fix for people using python2.1  
 from __future__ import nested_scopes  
   
16  import os  import os
 import string  
17    
18  import Thuban.Lib.fileutil  import Thuban.Lib.fileutil
19    
20  from Thuban.Model.color import Color  from Thuban.Model.color import Color
21    from Thuban.Model.layer import Layer, RasterLayer
22    
23  from Thuban.Model.classification import \  from Thuban.Model.classification import \
24      ClassGroupDefault, ClassGroupSingleton, ClassGroupRange, ClassGroupMap      ClassGroupDefault, ClassGroupSingleton, ClassGroupRange, ClassGroupMap
25    
26  #  from Thuban.Model.xmlwriter import XMLWriter
 # one level of indention  
 #  
 TAB = "    "  
27    
28  def relative_filename(dir, filename):  def relative_filename(dir, filename):
29      """Return a filename relative to dir for the absolute file name absname.      """Return a filename relative to dir for the absolute file name absname.
# Line 43  def relative_filename(dir, filename): Line 37  def relative_filename(dir, filename):
37      else:      else:
38          return filename          return filename
39    
 def escape(data):  
     """Escape &, \", ', <, and > in a string of data.  
     """  
     data = string.replace(data, "&", "&amp;")  
     data = string.replace(data, "<", "&lt;")  
     data = string.replace(data, ">", "&gt;")  
     data = string.replace(data, '"', "&quot;")  
     data = string.replace(data, "'", "&apos;")  
     return data  
   
 class XMLWriter:  
     """Abstract XMLWriter.  
   
     Should be overridden to provide specific object saving functionality.  
     """  
   
     def __init__(self):  
         self.filename = None  
         pass  
   
     def write(self, file_or_filename):  
         """Write the session to a file.  
   
         The argument may be either a file object or a filename. If it's  
         a filename, the file will be opened for writing. Files of  
         shapefiles will be stored as filenames relative to the directory  
         the file is stored in (as given by os.path.dirname(filename)) if  
         they have a common parent directory other than the root  
         directory.  
   
         If the argument is a file object (which is determined by the  
         presence of a write method) all filenames will be absolute  
         filenames.  
         """  
   
         # keep track of how many levels of indentation to write  
         self.indent_level = 0  
         # track whether an element is currently open. see open_element().  
         self.element_open = 0  
   
         if hasattr(file_or_filename, "write"):  
             # it's a file object  
             self.file = file_or_filename  
             self.dir = ""  
         else:  
             self.filename = file_or_filename  
             self.dir = os.path.dirname(self.filename)  
             self.file = open(self.filename, 'w')  
   
     def close(self):  
         assert self.indent_level == 0  
         if self.filename is not None:  
             self.file.close()  
   
     def write_header(self, doctype, system):  
         """Write the XML header"""  
         self.file.write('<?xml version="1.0" encoding="UTF-8"?>\n')  
         self.file.write('<!DOCTYPE %s SYSTEM "%s">\n' % (doctype, system))  
   
     def open_element(self, element, attrs = {}):  
   
         #  
         # we note when an element is opened so that if two open_element()  
         # calls are made successively we can end the currently open  
         # tag and will later write a proper close tag. otherwise,  
         # if a close_element() call is made directly after an open_element()  
         # call we will close the tag with a />  
         #  
         if self.element_open == 1:  
             self.file.write(">\n")  
   
         self.element_open = 1  
   
         # Helper function to write an element open tag with attributes  
         self.file.write("%s<%s" % (TAB*self.indent_level, element))  
         self.__write_attribs(attrs)  
   
         self.indent_level += 1  
   
     def close_element(self, element):  
         self.indent_level -= 1  
         assert self.indent_level >= 0  
   
         # see open_element() for an explanation  
         if self.element_open == 1:  
             self.element_open = 0  
             self.file.write("/>\n")  
         else:  
             self.file.write("%s</%s>\n" % (TAB*self.indent_level, element))  
   
     def write_element(self, element, attrs = {}):  
         """write an element that won't need a closing tag"""  
         self.open_element(element, attrs)  
         self.close_element(element)  
   
     def __write_attribs(self, attrs):  
         for name, value in attrs.items():  
             self.file.write(' %s="%s"' % (self.encode(name),  
                                           self.encode(value)))  
       
     def encode(self, str):  
         """Assume that str is in Latin1, escape it, and encode it in UTF-8.  
           
         If str is None, return None  
         """  
   
         if str is not None:  
             return escape(str).encode("utf8")  
         else:  
             return None  
   
40  class SessionSaver(XMLWriter):  class SessionSaver(XMLWriter):
41    
42      """Class to serialize a session into an XML file.      """Class to serialize a session into an XML file.
# Line 236  class SessionSaver(XMLWriter): Line 119  class SessionSaver(XMLWriter):
119          given, should be a mapping from attribute names to attribute          given, should be a mapping from attribute names to attribute
120          values. The values should not be XML-escaped yet.          values. The values should not be XML-escaped yet.
121          """          """
         lc = layer.GetClassification()  
122    
123          if attrs is None:          if attrs is None:
124              attrs = {}              attrs = {}
125    
126          attrs["title"]        = layer.title          attrs["title"]        = layer.title
         attrs["filename"]     = relative_filename(self.dir, layer.filename)  
         attrs["stroke"]       = lc.GetDefaultLineColor().hex()  
         attrs["stroke_width"] = str(lc.GetDefaultLineWidth())  
         attrs["fill"]         = lc.GetDefaultFill().hex()  
127          attrs["visible"]      = ("false", "true")[int(layer.Visible())]          attrs["visible"]      = ("false", "true")[int(layer.Visible())]
128    
129          self.open_element("layer", attrs)          if isinstance(layer, Layer):
130                attrs["filename"] = relative_filename(self.dir,
131          proj = layer.GetProjection()                                                  layer.ShapeStore().FileName())
132          if proj is not None:  
133              self.write_projection(proj)              lc = layer.GetClassification()
134                attrs["stroke"]       = lc.GetDefaultLineColor().hex()
135          self.write_classification(layer)              attrs["stroke_width"] = str(lc.GetDefaultLineWidth())
136                attrs["fill"]         = lc.GetDefaultFill().hex()
137          self.close_element("layer")  
138                self.open_element("layer", attrs)
139                self.write_projection(layer.GetProjection())
140                self.write_classification(layer)
141                self.close_element("layer")
142    
143            elif isinstance(layer, RasterLayer):
144                attrs["filename"] = relative_filename(self.dir, layer.filename)
145                self.open_element("rasterlayer", attrs)
146                self.write_projection(layer.GetProjection())
147                self.close_element("rasterlayer")
148    
149      def write_classification(self, layer, attrs = None):      def write_classification(self, layer, attrs = None):
150          if attrs is None:          if attrs is None:
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