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# Copyright (C) 2001 by Intevation GmbH |
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# Authors: |
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# Jan-Oliver Wagner <[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 sys, string, os |
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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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|
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oldPython=0 |
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|
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if not sys.__dict__.has_key("version_info"): |
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# We can assume to have python 1.5.2 or lower here now |
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oldPython=1 |
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|
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if oldPython: |
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try: |
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from xml.sax.saxexts import make_parser |
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from xml.sax.saxlib import HandlerBase |
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from xml.sax import saxutils |
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except ImportError: |
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sys.stdout.write(("You need to have Python-XML installed or" |
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" a modern Python!\n" |
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"Check www.python.org/sigs/xml-sig/\n\n")) |
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raise |
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else: |
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# Do the python 2.0 standard xml thing and map it on the old names |
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import xml.sax |
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import xml.sax.handler |
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HandlerBase=xml.sax.handler.ContentHandler |
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from xml.sax import make_parser |
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|
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class testSAXContentHandler(HandlerBase): |
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# SAX compliant |
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def characters(self, ch, start, length): |
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pass |
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|
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def test_for_broken_SAX(): |
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ch=testSAXContentHandler() |
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try: |
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xml.sax.parseString("""<?xml version="1.0"?> |
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<child1 name="paul">Text goes here</child1> |
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""",ch) |
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except TypeError: |
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return 1 |
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return 0 |
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|
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|
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def parse_color(color): |
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""" |
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Return the color object for the string color. Color may be either |
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'None' or of the form '#RRGGBB' in the usual 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 = None |
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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 ProcessSession(HandlerBase): |
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|
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def __init__(self, directory): |
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"""Inititialize the Sax handler. |
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|
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directory is the directory containing the session file. It's |
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needed to interpret embedded relative filenames |
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""" |
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self.directory = directory |
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self.chars = '' |
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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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def startElement(self, name, attrs): |
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if name == 'session': |
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self.theSession = Session(attrs.get('title', None)) |
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elif name == 'map': |
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self.aMap = Map(attrs.get('title', None)) |
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elif name == 'projection': |
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self.ProjectionParams = [ ] |
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elif name == 'parameter': |
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self.ProjectionParams.append(attrs.get('value', None)) |
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elif name == 'layer': |
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title = attrs.get('title', "") |
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filename = attrs.get('filename', "") |
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filename = os.path.join(self.directory, filename) |
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fill = parse_color(attrs.get('fill', "None")) |
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stroke = parse_color(attrs.get('stroke', "#000000")) |
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self.aLayer = Layer(title, filename, fill = fill, stroke = stroke) |
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elif name == 'table': |
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print "table title: %s" % attrs.get('title', None) |
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elif name == 'labellayer': |
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self.aLayer = self.aMap.LabelLayer() |
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elif name == 'label': |
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x = float(attrs['x']) |
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y = float(attrs['y']) |
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text = attrs['text'] |
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halign = attrs['halign'] |
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valign = attrs['valign'] |
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self.aLayer.AddLabel(x, y, text, halign = halign, valign = valign) |
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|
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|
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if not oldPython and test_for_broken_SAX(): |
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# works with python 2.0, but is not SAX compliant |
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def characters(self, ch): |
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self.my_characters(ch) |
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else: |
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# SAX compliant |
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def characters(self, ch, start, length): |
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self.my_characters(ch[start:start+length]) |
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|
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def my_characters(self, ch): |
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self.chars = self.chars + ch |
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|
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def endElement(self, name): |
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# If it's not a parameter element, ignore it |
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if name == 'session': |
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#print "end of session" |
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pass |
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if name == 'map': |
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self.theSession.AddMap(self.aMap) |
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if name == 'projection': |
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self.aMap.SetProjection(Projection(self.ProjectionParams)) |
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if name == 'layer': |
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self.aMap.AddLayer(self.aLayer) |
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if name == 'table': |
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#print "end of table" |
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pass |
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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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dir = os.path.dirname(filename) |
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file = open(filename) |
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handler = ProcessSession(dir) |
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|
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if oldPython: |
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parser = make_parser() |
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parser.setDocumentHandler(handler) |
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parser.setErrorHandler(saxutils.ErrorPrinter()) |
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parser.parseFile(file) |
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parser.close() |
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else: |
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xml.sax.parse(file,handler) |
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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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if __name__ == "__main__": |
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# find out the command to run |
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if len(sys.argv) > 1: |
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print "usage: cat <file> | " + sys.argv[0] |
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else: |
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parseSession(sys.stdin) |
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