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List:       pykde
Subject:    [PyKDE] brain-deadness
From:       tech () bishop ! dhs ! org
Date:       2003-01-06 3:43:37
[Download RAW message or body]

Working through the examples in Boudewijn's book, I've come across
something.  In chap. 7, it discussing using signals and slots to create
a little xml parser, which then displays in a tree list view.  It just
so happens that my next project is using xml and pyqt, so this
interested me.  However, (and I must be even more braindead than usual
to not understand this) how do I associate the "data" with the "tag"?
For instance, when you have a contruct like this: <tag>this is
data</tag>, the unknown_starttag signal is fired when it reaches <tag>,
and the handle_data signal is fired when it gets to "this is data", but
I'm not getting how you would say that "when unknown_starttag fires on
tag == "tag", then next handle_data should be directed to foo, which is
what I want/need.

Example code is attached (direct from the book!), along with example xml
file (and you might see what my project is ;-).  I don't need working
code in response, just a general idea of what to do.  Oh, and "get more
sleep, idiot" would be valid, but non-helpful B-)

Thanks,

D.A.Bishop

["pyget.py" (text/plain)]

import sys
import xmllib
from qt import *

TRUE=1
FALSE=0

class Parser(xmllib.XMLParser):
	def __init__(self, qObject, *args):
		xmllib.XMLParser.__init__(self)
		self.qObject=qObject

	def start(self, document):
		xmllib.XMLParser.feed(self, document)
		xmllib.XMLParser.close(self)

	def handle_xml(self, encoding, standalone):
		self.qObject.emit(PYSIGNAL("sigXML"), (encoding, standalone))

	def handle_data(self, data):
		self.qObject.emit(PYSIGNAL("sigData"),(data,))

	def unknown_starttag(self,tag, attributes):
		self.qObject.emit(PYSIGNAL("sigStartTag"), (tag,attributes))

	def unknown_endtag(self, tag):
		self.qObject.emit(PYSIGNAL("sigEndTag"), (tag,))

class TreeView(QListView):
	def __init__(self, *args):
		apply(QListView.__init__,(self, ) + args)
		self.stack=[]
		self.setRootIsDecorated(TRUE)
		self.addColumn("Element")

	def startDocument(self, tag, attributes ):
		i=QListViewItem(self)
		if tag == None: tag = "None"
		i.setText(0, tag)
		self.stack.append(i)
	
	def startElement(self, tag, attributes):
		if tag == None: tag = "None"
		i=QListViewItem(self.stack[-1])
		i.setText(0,tag)
		self.stack.append(i)

	def Data(self, data):
		print "",

	def endElement(self, tag):
		del(self.stack[-1])

def main(args):
	if (len(args) == 2):
		app=QApplication(sys.argv)

		QObject.connect(app, SIGNAL('lastWindowClosed()'), app, SLOT('quit()'))
		w = TreeView()
		app.setMainWidget(w)

		o=QObject()
		p=Parser(o)

		QObject.connect(o, PYSIGNAL("sigXML"),w.startDocument)
		QObject.connect(o, PYSIGNAL("sigStartTag"), w.startElement)
		QObject.connect(o, PYSIGNAL("sigData"), w.Data)
		QObject.connect(o, PYSIGNAL("sigEndTag"), w.endElement)

		s=open(args[1]).read()
		p.start(s)

		w.show()
		app.exec_loop()
	else:
		print "Usage: python qtparser.py FILE.xml"

if __name__=="__main__":
    main(sys.argv)

["test.xml" (text/xml)]

<?xml version='1.0' encoding="ISO-8859-1"?>
  <PACKAGE>
    <TITLE>Treasures</TITLE>
    <ACTION>download</ACTION>
    <TARGET>Treasures</TARGET>
    <EXP_DATE>7/4/2003 17:29</EXP_DATE>

    <PROVIDER>
      <AUTHOR>EMusic.com</AUTHOR>
      <NAME>EMusic.com</NAME>
      <URL>http://www.emusic.com</URL>
      <COPYRIGHT>Portions Copyright (C) 2002 EMusic.com Inc; see http://www.emusic.com for more \
details</COPYRIGHT>  <CONTACT>support@emusic.com</CONTACT>
    </PROVIDER>

    <SERVER>
      <NAME>EMusic.com</NAME>
      <DESC>Emusic content server</DESC>
      <NETNAME>downloads.mp3.com</NETNAME>
      <LOCATION>/%fid/%f</LOCATION>
      <KEY>Not used</KEY>
    </SERVER>

    <TRACKLIST>
    <LISTID>0</LISTID>

      <TRACK>
        <TRACKID>AFqUBgAARw7GNy1iHSoAAF7zBAAAXfMEAABCX8uvAEPazRg.AgBcUQAAAAGAQSQMGRzAA0JMVEyQdgejHFuDoHBXZqcF1ZE-</TRACKID>
  <TRACKNUM>1</TRACKNUM>
        <TITLE>Treasures</TITLE>
        <ALBUM>The Mirror Conspiracy</ALBUM>
        <ARTIST>Thievery Corporation</ARTIST>
        <GENRE>Electronic</GENRE>
        <FILENAME>Treasures.mp3</FILENAME>
        <FORMAT>.mp3</FORMAT>
        <QUALITY>128000</QUALITY>
        <CHANNELS>2</CHANNELS>
        <DURATION>144</DURATION>
        <ALBUMART>http://images.mp3.com/emusic/goodnoise/emusic_generic_cover_80x80.jpg</ALBUMART>
  </TRACK>

    </TRACKLIST>
  </PACKAGE>


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