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# Copyright (C) 2001, 2002, 2003 by Intevation GmbH |
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# Authors: |
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# Jan-Oliver Wagner <[email protected]> |
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# Bernhard Herzog <[email protected]> |
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# Jonathan Coles <[email protected]> |
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# |
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# This program is free software under the GPL (>=v2) |
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# Read the file COPYING coming with GRASS for details. |
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|
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""" |
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Parser for thuban session files. |
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""" |
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|
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__version__ = "$Revision$" |
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|
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import string, os |
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|
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import xml.sax |
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import xml.sax.handler |
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from xml.sax import make_parser, ErrorHandler, SAXNotRecognizedException |
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|
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from Thuban import _ |
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|
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from Thuban.Model.table import FIELDTYPE_INT, FIELDTYPE_DOUBLE, \ |
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FIELDTYPE_STRING |
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|
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from Thuban.Model.session import Session |
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from Thuban.Model.map import Map |
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from Thuban.Model.layer import Layer |
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from Thuban.Model.color import Color |
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from Thuban.Model.proj import Projection |
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from Thuban.Model.classification import Classification, \ |
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ClassGroupDefault, ClassGroupSingleton, ClassGroupRange, ClassGroupMap, \ |
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ClassGroupProperties |
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|
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|
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def parse_color(color): |
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"""Return the color object for the string color. |
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|
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Color may be either 'None' or of the form '#RRGGBB' in the usual |
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HTML color notation |
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""" |
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color = string.strip(color) |
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if color == "None": |
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result = Color.Transparent |
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elif color[0] == '#': |
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if len(color) == 7: |
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r = string.atoi(color[1:3], 16) / 255.0 |
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g = string.atoi(color[3:5], 16) / 255.0 |
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b = string.atoi(color[5:7], 16) / 255.0 |
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result = Color(r, g, b) |
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else: |
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raise ValueError(_("Invalid hexadecimal color specification %s") |
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% color) |
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else: |
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raise ValueError(_("Invalid color specification %s") % color) |
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return result |
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|
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|
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class XMLReader(xml.sax.handler.ContentHandler): |
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|
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# Dictionary mapping element names (or (URI, element name) pairs for |
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# documents using namespaces) to method names. The methods should |
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# accept the same parameters as the startElement (or startElementNS) |
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# methods. The start_dispatcher is used by the default startElement |
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# and startElementNS methods to call a method for the open tag of an |
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# element. |
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start_dispatcher = {} |
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|
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# end_dispatcher works just like start_dispatcher but it's used by |
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# endElement and endElementNS. The method whose names it maps to |
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# should accept the same parameters as endElement and endElementNS. |
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end_dispatcher = {} |
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|
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|
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def __init__(self): |
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self.chars = '' |
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self.__directory = "" |
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self.__dispatchers = {} |
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|
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def read(self, file_or_filename): |
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|
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if hasattr(file_or_filename, "read"): |
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# it's a file object |
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self.__directory = "" |
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self.__file = file_or_filename |
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else: |
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filename = file_or_filename |
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self.__directory = os.path.dirname(filename) |
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self.__file = open(filename) |
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|
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parser = make_parser() |
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parser.setContentHandler(self) |
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parser.setErrorHandler(ErrorHandler()) |
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parser.setFeature(xml.sax.handler.feature_namespaces, 1) |
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|
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# |
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# Well, this isn't pretty, but it appears that if you |
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# use Python 2.2 without the site-package _xmlplus then |
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# the following will fail, and without them it will work. |
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# However, if you do have the site-package and you don't |
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# call these functions, the reader raises an exception |
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# |
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# The reason we set these to 0 in the first place is |
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# because there is an unresolved issue with external |
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# entities causing an exception in the reader |
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# |
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try: |
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parser.setFeature(xml.sax.handler.feature_validation,0) |
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parser.setFeature(xml.sax.handler.feature_external_ges,0) |
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parser.setFeature(xml.sax.handler.feature_external_pes,0) |
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except SAXNotRecognizedException: |
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pass |
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|
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parser.parse(self.__file) |
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|
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self.close() |
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|
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def close(self): |
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self.__file.close() |
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|
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def GetFilename(self): |
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if hasattr(self.__file, "name"): |
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return self.__file.name |
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|
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return "" |
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|
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def GetDirectory(self): |
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return self.__directory |
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|
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|
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def AddDispatchers(self, dict): |
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"""Add the function names that should be used to process XML tags. |
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|
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dict -- a dictionary whose keys are XML tag strings and whose values |
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are pairs of strings such that the first string is |
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the name of the function that should be called when the |
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XML tag opens and the second string is the name of the |
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function that should be called when the XML tag closes. |
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If a pair element is None, no function is called. |
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""" |
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|
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self.__dispatchers.update(dict) |
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|
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def startElementNS(self, name, qname, attrs): |
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"""Call the method given for name in self.start_dispatcher |
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""" |
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if name[0] is None: |
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method_name = self.__dispatchers.get(name[1]) |
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else: |
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# Dispatch with namespace |
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method_name = self.__dispatchers.get(name) |
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if method_name is not None and method_name[0] is not None: |
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getattr(self, method_name[0])(name, qname, attrs) |
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|
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def endElementNS(self, name, qname): |
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"""Call the method given for name in self.end_dispatcher |
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""" |
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if name[0] is None: |
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method_name = self.__dispatchers.get(name[1]) |
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else: |
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# Dispatch with namespace |
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method_name = self.__dispatchers.get(name) |
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if method_name is not None and method_name[1] is not None: |
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getattr(self, method_name[1])(name, qname) |
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|
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class SessionLoader(XMLReader): |
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|
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def __init__(self): |
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"""Inititialize the Sax handler.""" |
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XMLReader.__init__(self) |
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|
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self.theSession = None |
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self.aMap = None |
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self.aLayer = None |
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|
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XMLReader.AddDispatchers(self, |
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{'session' : ("start_session", "end_session"), |
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'map' : ("start_map", "end_map"), |
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'projection' : ("start_projection", "end_projection"), |
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'parameter' : ("start_parameter", None), |
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'layer' : ("start_layer", "end_layer"), |
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'classification': ("start_classification", "end_classification"), |
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'clnull' : ("start_clnull", "end_clnull"), |
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'clpoint' : ("start_clpoint", "end_clpoint"), |
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'clrange' : ("start_clrange", "end_clrange"), |
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'cldata' : ("start_cldata", "end_cldata"), |
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'table' : ("start_table", "end_table"), |
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'labellayer' : ("start_labellayer", None), |
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'label' : ("start_label", None)}) |
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|
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def start_session(self, name, qname, attrs): |
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self.theSession = Session(attrs.get((None, 'title'), None)) |
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|
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def end_session(self, name, qname): |
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pass |
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|
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def start_map(self, name, qname, attrs): |
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"""Start a map.""" |
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self.aMap = Map(attrs.get((None, 'title'), None)) |
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self.__projReceiver = self.aMap |
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|
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def end_map(self, name, qname): |
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self.theSession.AddMap(self.aMap) |
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self.__projReceiver = None |
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|
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def start_projection(self, name, qname, attrs): |
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self.ProjectionName = attrs.get((None, 'name'), None) |
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self.ProjectionParams = [ ] |
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|
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def end_projection(self, name, qname): |
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self.__projReceiver.SetProjection( |
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Projection(self.ProjectionParams, self.ProjectionName)) |
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|
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def start_parameter(self, name, qname, attrs): |
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s = attrs.get((None, 'value')) |
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s = str(s) # we can't handle unicode in proj |
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self.ProjectionParams.append(s) |
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|
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def start_layer(self, name, qname, attrs, layer_class = Layer): |
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"""Start a layer |
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|
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Instantiate a layer of class layer_class from the attributes in |
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attrs which may be a dictionary as well as the normal SAX attrs |
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object and bind it to self.aLayer. |
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""" |
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title = attrs.get((None, 'title'), "") |
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filename = attrs.get((None, 'filename'), "") |
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filename = os.path.join(self.GetDirectory(), filename) |
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visible = attrs.get((None, 'visible'), "true") |
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fill = parse_color(attrs.get((None, 'fill'), "None")) |
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stroke = parse_color(attrs.get((None, 'stroke'), "#000000")) |
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stroke_width = int(attrs.get((None, 'stroke_width'), "1")) |
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self.aLayer = layer_class(title, |
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self.theSession.OpenShapefile(filename), |
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fill = fill, stroke = stroke, |
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lineWidth = stroke_width, |
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visible = visible != "false") |
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|
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self.__projReceiver = self.aLayer |
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|
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def end_layer(self, name, qname): |
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self.aMap.AddLayer(self.aLayer) |
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self.__projReceiver = None |
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|
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def start_classification(self, name, qname, attrs): |
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field = attrs.get((None, 'field'), None) |
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|
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fieldType = attrs.get((None, 'field_type'), None) |
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dbFieldType = self.aLayer.GetFieldType(field) |
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|
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if fieldType != dbFieldType: |
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raise ValueError(_("xml field type differs from database!")) |
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|
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# setup conversion routines depending on the kind of data |
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# we will be seeing later on |
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if fieldType == FIELDTYPE_STRING: |
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self.conv = str |
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elif fieldType == FIELDTYPE_INT: |
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self.conv = lambda p: int(float(p)) |
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elif fieldType == FIELDTYPE_DOUBLE: |
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self.conv = float |
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|
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self.aLayer.GetClassification().SetField(field) |
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|
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|
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def end_classification(self, name, qname): |
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pass |
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|
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def start_clnull(self, name, qname, attrs): |
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self.cl_group = ClassGroupDefault() |
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self.cl_group.SetLabel(attrs.get((None, 'label'), "")) |
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self.cl_prop = ClassGroupProperties() |
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|
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def end_clnull(self, name, qname): |
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self.cl_group.SetProperties(self.cl_prop) |
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self.aLayer.GetClassification().SetDefaultGroup(self.cl_group) |
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del self.cl_group, self.cl_prop |
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|
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def start_clpoint(self, name, qname, attrs): |
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attrib_value = attrs.get((None, 'value'), "0") |
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|
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value = self.conv(attrib_value) |
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|
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self.cl_group = ClassGroupSingleton(value) |
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self.cl_group.SetLabel(attrs.get((None, 'label'), "")) |
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self.cl_prop = ClassGroupProperties() |
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|
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|
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def end_clpoint(self, name, qname): |
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self.cl_group.SetProperties(self.cl_prop) |
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self.aLayer.GetClassification().AppendGroup(self.cl_group) |
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del self.cl_group, self.cl_prop |
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|
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def start_clrange(self, name, qname, attrs): |
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|
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try: |
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min = self.conv(attrs.get((None, 'min'), "0")) |
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max = self.conv(attrs.get((None, 'max'), "0")) |
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except ValueError: |
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raise ValueError(_("Classification range is not a number!")) |
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|
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self.cl_group = ClassGroupRange(min, max) |
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self.cl_group.SetLabel(attrs.get((None, 'label'), "")) |
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self.cl_prop = ClassGroupProperties() |
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|
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|
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def end_clrange(self, name, qname): |
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self.cl_group.SetProperties(self.cl_prop) |
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self.aLayer.GetClassification().AppendGroup(self.cl_group) |
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del self.cl_group, self.cl_prop |
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|
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def start_cldata(self, name, qname, attrs): |
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self.cl_prop.SetLineColor( |
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parse_color(attrs.get((None, 'stroke'), "None"))) |
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self.cl_prop.SetLineWidth( |
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int(attrs.get((None, 'stroke_width'), "0"))) |
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self.cl_prop.SetFill(parse_color(attrs.get((None, 'fill'), "None"))) |
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|
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def end_cldata(self, name, qname): |
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pass |
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|
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def start_table(self, name, qname, attrs): |
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#print "table title: %s" % attrs.get('title', None) |
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pass |
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|
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def end_table(self, name, qname): |
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pass |
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|
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def start_labellayer(self, name, qname, attrs): |
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self.aLayer = self.aMap.LabelLayer() |
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|
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def start_label(self, name, qname, attrs): |
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x = float(attrs[(None, 'x')]) |
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y = float(attrs[(None, 'y')]) |
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text = attrs[(None, 'text')] |
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halign = attrs[(None, 'halign')] |
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valign = attrs[(None, 'valign')] |
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self.aLayer.AddLabel(x, y, text, halign = halign, valign = valign) |
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|
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def characters(self, chars): |
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pass |
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|
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|
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def load_session(filename): |
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"""Load a Thuban session from the file object file""" |
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|
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handler = SessionLoader() |
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handler.read(filename) |
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|
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session = handler.theSession |
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# Newly loaded session aren't modified |
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session.UnsetModified() |
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|
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return session |
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|
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