initial checkin of www Tk examples

Demo/tkinter/www/sgmllib.py

+# A parser for SGML, using the derived class as static DTD.
+
+# XXX This only supports those SGML features used by HTML.
+
+# XXX There should be a way to distinguish between PCDATA (parsed
+# character data -- the normal case), RCDATA (replaceable character
+# data -- only char and entity references and end tags are special)
+# and CDATA (character data -- only end tags are special).
+
+
+import regex
+import string
+
+
+# Regular expressions used for parsing
+
+incomplete = regex.compile( \
+	  '<!-?\|</[a-zA-Z][a-zA-Z0-9]*[ \t\n]*\|</?\|' + \
+	  '&#[a-zA-Z0-9]*\|&[a-zA-Z][a-zA-Z0-9]*\|&')
+entityref = regex.compile('&[a-zA-Z][a-zA-Z0-9]*[;.]')
+charref = regex.compile('&#[a-zA-Z0-9]+;')
+starttagopen = regex.compile('<[a-zA-Z]')
+endtag = regex.compile('</[a-zA-Z][a-zA-Z0-9]*[ \t\n]*>')
+commentopen = regex.compile('<!--')
+
+
+# SGML parser base class -- find tags and call handler functions.
+# Usage: p = SGMLParser(); p.feed(data); ...; p.close().
+# The dtd is defined by deriving a class which defines methods
+# with special names to handle tags: start_foo and end_foo to handle
+# <foo> and </foo>, respectively, or do_foo to handle <foo> by itself.
+# (Tags are converted to lower case for this purpose.)  The data
+# between tags is passed to the parser by calling self.handle_data()
+# with some data as argument (the data may be split up in arbutrary
+# chunks).  Entity references are passed by calling
+# self.handle_entityref() with the entity reference as argument.
+
+class SGMLParser:
+
+	# Interface -- initialize and reset this instance
+	def __init__(self):
+		self.reset()
+
+	# Interface -- reset this instance.  Loses all unprocessed data
+	def reset(self):
+		self.rawdata = ''
+		self.stack = []
+		self.nomoretags = 0
+		self.literal = 0
+
+	# For derived classes only -- enter literal mode (CDATA) till EOF
+	def setnomoretags(self):
+		self.nomoretags = self.literal = 1
+
+	# For derived classes only -- enter literal mode (CDATA)
+	def setliteral(self, *args):
+		self.literal = 1
+
+	# Interface -- feed some data to the parser.  Call this as
+	# often as you want, with as little or as much text as you
+	# want (may include '\n').  (This just saves the text, all the
+	# processing is done by process() or close().)
+	def feed(self, data):
+		self.rawdata = self.rawdata + data
+		self.goahead(0)
+
+	# Interface -- handle the remaining data
+	def close(self):
+		self.goahead(1)
+
+	# Internal -- handle data as far as reasonable.  May leave state
+	# and data to be processed by a subsequent call.  If 'end' is
+	# true, force handling all data as if followed by EOF marker.
+	def goahead(self, end):
+		rawdata = self.rawdata
+		i = 0
+		n = len(rawdata)
+		while i < n:
+			if self.nomoretags:
+				self.handle_data(rawdata[i:n])
+				i = n
+				break
+			j = incomplete.search(rawdata, i)
+			if j < 0: j = n
+			if i < j: self.handle_data(rawdata[i:j])
+			i = j
+			if i == n: break
+			if rawdata[i] == '<':
+				if starttagopen.match(rawdata, i) >= 0:
+					if self.literal:
+						self.handle_data(rawdata[i])
+						i = i+1
+						continue
+					k = self.parse_starttag(i)
+					if k < 0: break
+					i = i + k
+					continue
+				k = endtag.match(rawdata, i)
+				if k >= 0:
+					j = i+k
+					self.parse_endtag(rawdata[i:j])
+					i = j
+					self.literal = 0
+					continue
+				if commentopen.match(rawdata, i) >= 0:
+					if self.literal:
+						self.handle_data(rawdata[i])
+						i = i+1
+						continue
+					k = self.parse_comment(i)
+					if k < 0: break
+					i = i+k
+					continue
+			elif rawdata[i] == '&':
+				k = charref.match(rawdata, i)
+				if k >= 0:
+					j = i+k
+					self.handle_charref(rawdata[i+2:j-1])
+					i = j
+					continue
+				k = entityref.match(rawdata, i)
+				if k >= 0:
+					j = i+k
+					self.handle_entityref(rawdata[i+1:j-1])
+					i = j
+					continue
+			else:
+				raise RuntimeError, 'neither < nor & ??'
+			# We get here only if incomplete matches but
+			# nothing else
+			k = incomplete.match(rawdata, i)
+			if k < 0: raise RuntimeError, 'no incomplete match ??'
+			j = i+k
+			if j == n: break # Really incomplete
+			self.handle_data(rawdata[i:j])
+			i = j
+		# end while
+		if end and i < n:
+			self.handle_data(rawdata[i:n])
+			i = n
+		self.rawdata = rawdata[i:]
+		# XXX if end: check for empty stack
+
+	# Internal -- parse comment, return length or -1 if not ternimated
+	def parse_comment(self, i):
+		rawdata = self.rawdata
+		if rawdata[i:i+4] <> '<!--':
+			raise RuntimeError, 'unexpected call to handle_comment'
+		try:
+			j = string.index(rawdata, '--', i+4)
+		except string.index_error:
+			return -1
+		self.handle_comment(rawdata[i+4: j])
+		j = j+2
+		n = len(rawdata)
+		while j < n and rawdata[j] in ' \t\n': j = j+1
+		if j == n: return -1 # Wait for final '>'
+		if rawdata[j] == '>':
+			j = j+1
+		else:
+			print '*** comment not terminated with >'
+			print repr(rawdata[j-5:j]), '*!*', repr(rawdata[j:j+5])
+		return j-i
+
+	# Internal -- handle starttag, return length or -1 if not terminated
+	def parse_starttag(self, i):
+		rawdata = self.rawdata
+		try:
+			j = string.index(rawdata, '>', i)
+		except string.index_error:
+			return -1
+		# Now parse the data between i+1 and j into a tag and attrs
+		attrs = []
+		tagfind = regex.compile('[a-zA-Z][a-zA-Z0-9]*')
+		attrfind = regex.compile( \
+		  '[ \t\n]+\([a-zA-Z][a-zA-Z0-9]*\)' + \
+		  '\([ \t\n]*=[ \t\n]*' + \
+		     '\(\'[^\']*\';\|"[^"]*"\|[-a-zA-Z0-9./:+*%?!()_#]+\)\)?')
+		k = tagfind.match(rawdata, i+1)
+		if k < 0:
+			raise RuntimeError, 'unexpected call to parse_starttag'
+		k = i+1+k
+		tag = string.lower(rawdata[i+1:k])
+		while k < j:
+			l = attrfind.match(rawdata, k)
+			if l < 0: break
+			regs = attrfind.regs
+			a1, b1 = regs[1]
+			a2, b2 = regs[2]
+			a3, b3 = regs[3]
+			attrname = rawdata[a1:b1]
+			if '=' in rawdata[k:k+l]:
+				attrvalue = rawdata[a3:b3]
+				if attrvalue[:1] == '\'' == attrvalue[-1:] or \
+				   attrvalue[:1] == '"' == attrvalue[-1:]:
+					attrvalue = attrvalue[1:-1]
+			else:
+				attrvalue = ''
+			attrs.append(string.lower(attrname), attrvalue)
+			k = k + l
+		j = j+1
+		try:
+			method = getattr(self, 'start_' + tag)
+		except AttributeError:
+			try:
+				method = getattr(self, 'do_' + tag)
+			except AttributeError:
+				self.unknown_starttag(tag, attrs)
+				return j-i
+			method(attrs)
+			return j-i
+		self.stack.append(tag)
+		method(attrs)
+		return j-i
+
+	# Internal -- parse endtag
+	def parse_endtag(self, data):
+		if data[:2] <> '</' or data[-1:] <> '>':
+			raise RuntimeError, 'unexpected call to parse_endtag'
+		tag = string.lower(string.strip(data[2:-1]))
+		try:
+			method = getattr(self, 'end_' + tag)
+		except AttributeError:
+			self.unknown_endtag(tag)
+			return
+		if self.stack and self.stack[-1] == tag:
+			del self.stack[-1]
+		else:
+			print '*** Unbalanced </' + tag + '>'
+			print '*** Stack:', self.stack
+			found = None
+			for i in range(len(self.stack)):
+				if self.stack[i] == tag: found = i
+			if found <> None:
+				del self.stack[found:]
+		method()
+
+	# Example -- handle character reference, no need to override
+	def handle_charref(self, name):
+		try:
+			n = string.atoi(name)
+		except string.atoi_error:
+			self.unknown_charref(name)
+			return
+		if not 0 <= n <= 255:
+			self.unknown_charref(name)
+			return
+		self.handle_data(chr(n))
+
+	# Definition of entities -- derived classes may override
+	entitydefs = \
+		{'lt': '<', 'gt': '>', 'amp': '&', 'quot': '"', 'apos': '\''}
+
+	# Example -- handle entity reference, no need to override
+	def handle_entityref(self, name):
+		table = self.__class__.entitydefs
+		name = string.lower(name)
+		if table.has_key(name):
+			self.handle_data(table[name])
+		else:
+			self.unknown_entityref(name)
+			return
+
+	# Example -- handle data, should be overridden
+	def handle_data(self, data):
+		pass
+
+	# Example -- handle comment, could be overridden
+	def handle_comment(self, data):
+		pass
+
+	# To be overridden -- handlers for unknown objects
+	def unknown_starttag(self, tag, attrs): pass
+	def unknown_endtag(self, tag): pass
+	def unknown_charref(self, ref): pass
+	def unknown_entityref(self, ref): pass
+
+
+class TestSGML(SGMLParser):
+
+	def handle_data(self, data):
+		r = repr(data)
+		if len(r) > 72:
+			r = r[:35] + '...' + r[-35:]
+		print 'data:', r
+
+	def handle_comment(self, data):
+		r = repr(data)
+		if len(r) > 68:
+			r = r[:32] + '...' + r[-32:]
+		print 'comment:', r
+
+	def unknown_starttag(self, tag, attrs):
+		print 'start tag: <' + tag,
+		for name, value in attrs:
+			print name + '=' + '"' + value + '"',
+		print '>'
+
+	def unknown_endtag(self, tag):
+		print 'end tag: </' + tag + '>'
+
+	def unknown_entityref(self, ref):
+		print '*** unknown entity ref: &' + ref + ';'
+
+	def unknown_charref(self, ref):
+		print '*** unknown char ref: &#' + ref + ';'
+
+
+def test():
+	file = 'test.html'
+	f = open(file, 'r')
+	x = TestSGML()
+	while 1:
+		line = f.readline()
+		if not line:
+			x.close()
+			break
+		x.feed(line)
+
+
+#test()

Demo/tkinter/www/tkfmt.py

+# Tk backend -- unfinished
+
+debug = 0
+
+from fmt import *
+
+class TkFormatter:
+
+	def __init__(self, text):
+		self.text = text	# The text widget to draw in
+		self.nospace = 1
+		self.blanklines = 0
+		self.font = ''
+
+	# Methods called by htmllib.FormattingParser:
+
+	def setfont(self, font):
+		if 1 or debug: print "setfont(%s)" % `font`
+		self.font = font
+
+	def resetfont(self):
+		if debug: print "resetfont()"
+		self.font = ''
+
+	def flush(self):
+		if debug: print "flush()"
+		self.needvspace(1)
+
+	def setleftindent(self, n):
+		if debug: print "setleftindent(%d)" % n
+
+	def needvspace(self, n):
+		if debug: print "needvspace(%d)" % n
+		self.blanklines = max(n, self.blanklines)
+		self.nospace = 1
+
+	def addword(self, word, nspaces):
+		if debug: print "addword(%s, %d)" % (`word`, nspaces)
+		if self.nospace and not word:
+			return
+		if self.blanklines > 0:
+			word = '\n'*self.blanklines + word
+		self.blanklines = 0
+		self.nospace = 0
+		here = self.text.index('end')
+		self.text.insert('end', word + nspaces*' ')
+		if not self.font:
+			self.tag_remo
+
+	def setjust(self, c):
+		if debug: print "setjust(%s)" % `c`
+
+	def bgn_anchor(self):
+		if debug: print "bgn_anchor()"
+
+	def end_anchor(self):
+		if debug: print "end_anchor()"
+
+	def hrule(self):
+		if debug: print "hrule()"
+		self.flush()
+		self.addword('_'*60, 0)
+		self.flush()

Demo/tkinter/www/www1.py

+#! /usr/local/bin/python
+
+# www1.py -- print the contents of a URL on stdout
+
+import sys
+import urllib
+
+def main():
+	if len(sys.argv) != 2 or sys.argv[1][:1] == '-':
+		print "Usage:", sys.argv[0], "url"
+		sys.exit(2)
+	url = sys.argv[1]
+	fp = urllib.urlopen(url)
+	while 1:
+		line = fp.readline()
+		if not line: break
+		print line,
+
+main()

Demo/tkinter/www/www10.py

+#! /usr/local/bin/python
+
+# www10.py -- display the contents of a URL in a Text widget
+# - set window title
+# - make window resizable
+# - update display while reading
+# - vertical scroll bar
+# - rewritten as class
+# - editable url entry and reload button
+
+import sys
+import urllib
+from Tkinter import *
+
+def main():
+	if len(sys.argv) != 2 or sys.argv[1][:1] == '-':
+		print "Usage:", sys.argv[0], "url"
+		sys.exit(2)
+	url = sys.argv[1]
+	viewer = Viewer()
+	viewer.load(url)
+	viewer.go()
+
+class Viewer:
+
+	def __init__(self):
+		# Create root window
+		self.root = Tk()
+		self.root.minsize(1, 1)
+
+		# Create topframe for the entry and button
+		self.topframe = Frame(self.root)
+		self.topframe.pack({'fill': 'x', 'side': 'top'})
+
+		# Create a label in front of the entry
+		self.urllabel = Label(self.topframe, {'text': 'URL:'})
+		self.urllabel.pack({'side': 'left'})
+
+		# Create the entry containing the URL
+		self.entry = Entry(self.topframe, {'relief': 'sunken'})
+		self.entry.pack({'side': 'left', 'fill': 'x', 'expand': 1})
+		self.entry.bind('<Return>', self.loadit)
+
+		# Create the button
+		self.reload = Button(self.topframe,
+				     {'text': 'Reload',
+				      'command': self.reload})
+		self.reload.pack({'side': 'right'})
+
+		# Create botframe for the text and scrollbar
+		self.botframe = Frame(self.root)
+		self.botframe.pack({'fill': 'both', 'expand': 1})
+
+		# The Scrollbar *must* be created first
+		self.vbar = Scrollbar(self.botframe)
+		self.vbar.pack({'fill': 'y', 'side': 'right'})
+		self.text = Text(self.botframe)
+		self.text.pack({'expand': 1, 'fill': 'both', 'side': 'left'})
+
+		# Link Text widget and Scrollbar
+		self.text['yscrollcommand'] = (self.vbar, 'set')
+		self.vbar['command'] = (self.text, 'yview')
+
+		self.url = None
+
+	def load(self, url):
+		# Load a new URL into the window
+		fp = urllib.urlopen(url)
+
+		self.url = url
+
+		self.root.title(url)
+
+		self.entry.delete('0', 'end')
+		self.entry.insert('end', url)
+
+		self.text.delete('1.0', 'end')
+
+		while 1:
+			line = fp.readline()
+			if not line: break
+			if line[-2:] == '\r\n': line = line[:-2] + '\n'
+			self.text.insert('end', line)
+			self.root.update_idletasks()
+
+		fp.close()
+
+	def go(self):
+		# Start Tk main loop
+		self.root.mainloop()
+
+	def reload(self, *args):
+		# Callback for Reload button
+		if self.url:
+			self.load(self.url)
+
+	def loadit(self, *args):
+		# Callback for <Return> event in entry
+		self.load(self.entry.get())
+
+main()

Demo/tkinter/www/www11.py

+#! /usr/local/bin/python
+
+# www11.py -- display the contents of a URL in a Text widget
+# - set window title
+# - make window resizable
+# - update display while reading
+# - vertical scroll bar
+# - rewritten as class
+# - editable url entry and reload button
+# - error dialog
+
+import sys
+import urllib
+from Tkinter import *
+import Dialog
+
+def main():
+	if len(sys.argv) != 2 or sys.argv[1][:1] == '-':
+		print "Usage:", sys.argv[0], "url"
+		sys.exit(2)
+	url = sys.argv[1]
+	viewer = Viewer()
+	viewer.load(url)
+	viewer.go()
+
+class Viewer:
+
+	def __init__(self):
+		# Create root window
+		self.root = Tk()
+		self.root.minsize(1, 1)
+
+		# Create topframe for the entry and button
+		self.topframe = Frame(self.root)
+		self.topframe.pack({'fill': 'x'})
+
+		# Create a label in front of the entry
+		self.urllabel = Label(self.topframe, {'text': 'URL:'})
+		self.urllabel.pack({'side': 'left'})
+
+		# Create the entry containing the URL
+		self.entry = Entry(self.topframe,
+				   {'relief': 'sunken', 'border': 2})
+		self.entry.pack({'side': 'left', 'fill': 'x', 'expand': 1})
+		self.entry.bind('<Return>', self.loadit)
+
+		# Create the button
+		self.reload = Button(self.topframe,
+				     {'text': 'Reload',
+				      'command': self.reload})
+		self.reload.pack({'side': 'right'})
+
+		# Create botframe for the text and scrollbar
+		self.botframe = Frame(self.root)
+		self.botframe.pack({'fill': 'both', 'expand': 1})
+
+		# The Scrollbar *must* be created first
+		self.vbar = Scrollbar(self.botframe)
+		self.vbar.pack({'fill': 'y', 'side': 'right'})
+		self.text = Text(self.botframe)
+		self.text.pack({'expand': 1, 'fill': 'both', 'side': 'left'})
+
+		# Link Text widget and Scrollbar
+		self.text['yscrollcommand'] = (self.vbar, 'set')
+		self.vbar['command'] = (self.text, 'yview')
+
+		self.url = None
+
+	def load(self, url):
+		# Load a new URL into the window
+		fp, url = self.urlopen(url)
+		if not fp:
+			return
+
+		self.url = url
+
+		self.root.title(url)
+
+		self.entry.delete('0', 'end')
+		self.entry.insert('end', url)
+
+		self.text.delete('0.0', 'end')
+
+		while 1:
+			line = fp.readline()
+			if not line: break
+			if line[-2:] == '\r\n': line = line[:-2] + '\n'
+			self.text.insert('end', line)
+			self.root.update_idletasks()
+
+		fp.close()
+
+	def urlopen(self, url):
+		# Open a URL --
+		# return (fp, url) if successful
+		# display dialog and return (None, url) for errors
+		try:
+			fp = urllib.urlopen(url)
+		except IOError, msg:
+			import types
+			if type(msg) == types.TupleType and len(msg) == 4:
+				if msg[1] == 302:
+					m = msg[3]
+					if m.has_key('location'):
+						url = m['location']
+						return self.urlopen(url)
+					elif m.has_key('uri'):
+						url = m['uri']
+						return self.urlopen(url)
+			self.errordialog(IOError, msg)
+			fp = None
+		return fp, url
+
+	def errordialog(self, exc, msg):
+		# Display an error dialog -- return when the user clicks OK
+		Dialog.Dialog(self.root, {
+			'text': str(msg),
+			'title': exc,
+			'bitmap': 'error',
+			'default': 0,
+			'strings': ('OK',),
+			})
+
+	def go(self):
+		# Start Tk main loop
+		self.root.mainloop()
+
+	def reload(self, *args):
+		# Callback for Reload button
+		if self.url:
+			self.load(self.url)
+
+	def loadit(self, *args):
+		# Callback for <Return> event in entry
+		self.load(self.entry.get())
+
+main()

Demo/tkinter/www/www12.py

+#! /usr/local/bin/python
+
+# www12.py -- display the contents of a URL in a Text widget
+# - set window title
+# - make window resizable
+# - update display while reading
+# - vertical scroll bar
+# - rewritten as class
+# - editable url entry and reload button
+# - error dialog
+# - menu bar; added 'master' option to constructor
+
+import sys
+import urllib
+from Tkinter import *
+import Dialog
+
+def main():
+	if len(sys.argv) != 2 or sys.argv[1][:1] == '-':
+		print "Usage:", sys.argv[0], "url"
+		sys.exit(2)
+	url = sys.argv[1]
+	tk = Tk()
+	tk.withdraw()
+	viewer = Viewer(tk)
+	viewer.load(url)
+	viewer.go()
+
+class Viewer:
+
+	def __init__(self, master = None):
+		# Create root window
+		if master is None:
+			self.root = self.master = Tk()
+		else:
+			self.master = master
+			self.root = Toplevel(self.master)
+		self.root.minsize(1, 1)
+
+		# Create menu bar
+		self.mbar = Frame(self.root,
+				  {'relief': 'raised',
+				   'border': 2})
+		self.mbar.pack({'fill': 'x'})
+
+		# Create File menu
+		self.filebutton = Menubutton(self.mbar, {'text': 'File'})
+		self.filebutton.pack({'side': 'left'})
+
+		self.filemenu = Menu(self.filebutton)
+		self.filebutton['menu'] = self.filemenu
+
+		# Create Edit menu
+		self.editbutton = Menubutton(self.mbar, {'text': 'Edit'})
+		self.editbutton.pack({'side': 'left'})
+
+		self.editmenu = Menu(self.editbutton)
+		self.editbutton['menu'] = self.editmenu
+
+		# Magic so you can swipe from one button to the next
+		self.mbar.tk_menuBar(self.filebutton, self.editbutton)
+
+		# Populate File menu
+		self.filemenu.add('command', {'label': 'New',
+					      'command': self.new_command})
+		self.filemenu.add('command', {'label': 'Open...',
+					      'command': self.open_command})
+		self.filemenu.add('command', {'label': 'Clone',
+					      'command': self.clone_command})
+		self.filemenu.add('separator')
+		self.filemenu.add('command', {'label': 'Close',
+					      'command': self.close_command})
+		self.filemenu.add('command', {'label': 'Quit',
+					      'command': self.quit_command})
+
+		# Populate Edit menu
+		pass
+
+		# Create topframe for the entry and button
+		self.topframe = Frame(self.root)
+		self.topframe.pack({'fill': 'x'})
+
+		# Create a label in front of the entry
+		self.urllabel = Label(self.topframe, {'text': 'URL:'})
+		self.urllabel.pack({'side': 'left'})
+
+		# Create the entry containing the URL
+		self.entry = Entry(self.topframe,
+				   {'relief': 'sunken', 'border': 2})
+		self.entry.pack({'side': 'left', 'fill': 'x', 'expand': 1})
+		self.entry.bind('<Return>', self.loadit)
+
+		# Create the button
+		self.reload = Button(self.topframe,
+				     {'text': 'Reload',
+				      'command': self.reload})
+		self.reload.pack({'side': 'right'})
+
+		# Create botframe for the text and scrollbar
+		self.botframe = Frame(self.root)
+		self.botframe.pack({'fill': 'both', 'expand': 1})
+
+		# The Scrollbar *must* be created first
+		self.vbar = Scrollbar(self.botframe)
+		self.vbar.pack({'fill': 'y', 'side': 'right'})
+		self.text = Text(self.botframe)
+		self.text.pack({'expand': 1, 'fill': 'both', 'side': 'left'})
+
+		# Link Text widget and Scrollbar
+		self.text['yscrollcommand'] = (self.vbar, 'set')
+		self.vbar['command'] = (self.text, 'yview')
+
+		self.url = None
+
+	def load(self, url):
+		# Load a new URL into the window
+		fp, url = self.urlopen(url)
+		if not fp:
+			return
+
+		self.url = url
+
+		self.root.title(url)
+
+		self.entry.delete('0', 'end')
+		self.entry.insert('end', url)
+
+		self.text.delete('0.0', 'end')
+
+		while 1:
+			line = fp.readline()
+			if not line: break
+			if line[-2:] == '\r\n': line = line[:-2] + '\n'
+			self.text.insert('end', line)
+			self.root.update_idletasks()
+
+		fp.close()
+
+	def urlopen(self, url):
+		# Open a URL --
+		# return (fp, url) if successful
+		# display dialog and return (None, url) for errors
+		try:
+			fp = urllib.urlopen(url)
+		except IOError, msg:
+			import types
+			if type(msg) == types.TupleType and len(msg) == 4:
+				if msg[1] == 302:
+					m = msg[3]
+					if m.has_key('location'):
+						url = m['location']
+						return self.urlopen(url)
+					elif m.has_key('uri'):
+						url = m['uri']
+						return self.urlopen(url)
+			self.errordialog(IOError, msg)
+			fp = None
+		return fp, url
+
+	def errordialog(self, exc, msg):
+		# Display an error dialog -- return when the user clicks OK
+		Dialog.Dialog(self.root, {
+			'text': str(msg),
+			'title': exc,
+			'bitmap': 'error',
+			'default': 0,
+			'strings': ('OK',),
+			})
+
+	def go(self):
+		# Start Tk main loop
+		self.root.mainloop()
+
+	def reload(self, *args):
+		# Callback for Reload button
+		if self.url:
+			self.load(self.url)
+
+	def loadit(self, *args):
+		# Callback for <Return> event in entry
+		self.load(self.entry.get())
+
+	def new_command(self):
+		# File/New...
+		Viewer(self.master)
+
+	def clone_command(self):
+		# File/Clone
+		v = Viewer(self.master)
+		v.load(self.url)
+
+	def open_command(self):
+		# File/Open...
+		print "File/Open...: Not implemented"
+
+	def close_command(self):
+		# File/Close
+		self.destroy()
+
+	def quit_command(self):
+		# File/Quit
+		self.root.quit()
+
+	def destroy(self):
+		# Destroy this window
+		self.root.destroy()
+		if self.master is not self.root and not self.master.children:
+			self.master.quit()
+
+main()

Demo/tkinter/www/www13.py

+#! /usr/local/bin/python
+
+# www13.py -- display the contents of a URL in a Text widget
+# - set window title
+# - make window resizable
+# - update display while reading
+# - vertical scroll bar
+# - rewritten as class
+# - editable url entry and reload button
+# - error dialog
+# - menu bar; added 'master' option to constructor
+# - Added HTML parser
+
+import sys
+import urllib
+from Tkinter import *
+import Dialog
+import tkfmt
+import htmllib
+
+def main():
+	if len(sys.argv) != 2 or sys.argv[1][:1] == '-':
+		print "Usage:", sys.argv[0], "url"
+		sys.exit(2)
+	url = sys.argv[1]
+	tk = Tk()
+	tk.withdraw()
+	viewer = Viewer(tk)
+	viewer.load(url)
+	viewer.go()
+
+class Viewer:
+
+	def __init__(self, master = None):
+		# Create root window
+		if master is None:
+			self.root = self.master = Tk()
+		else:
+			self.master = master
+			self.root = Toplevel(self.master)
+		self.root.minsize(1, 1)
+
+		# Create menu bar
+		self.mbar = Frame(self.root,
+				  {'relief': 'raised',
+				   'border': 2})
+		self.mbar.pack({'fill': 'x'})
+
+		# Create File menu
+		self.filebutton = Menubutton(self.mbar, {'text': 'File'})
+		self.filebutton.pack({'side': 'left'})
+
+		self.filemenu = Menu(self.filebutton)
+		self.filebutton['menu'] = self.filemenu
+
+		# Create Edit menu
+		self.editbutton = Menubutton(self.mbar, {'text': 'Edit'})
+		self.editbutton.pack({'side': 'left'})
+
+		self.editmenu = Menu(self.editbutton)
+		self.editbutton['menu'] = self.editmenu
+
+		# Magic so you can swipe from one button to the next
+		self.mbar.tk_menuBar(self.filebutton, self.editbutton)
+
+		# Populate File menu
+		self.filemenu.add('command', {'label': 'New',
+					      'command': self.new_command})
+		self.filemenu.add('command', {'label': 'Open...',
+					      'command': self.open_command})
+		self.filemenu.add('command', {'label': 'Clone',
+					      'command': self.clone_command})
+		self.filemenu.add('separator')
+		self.filemenu.add('command', {'label': 'Close',
+					      'command': self.close_command})
+		self.filemenu.add('command', {'label': 'Quit',
+					      'command': self.quit_command})
+
+		# Populate Edit menu
+		pass
+
+		# Create topframe for the entry and button
+		self.topframe = Frame(self.root)
+		self.topframe.pack({'fill': 'x'})
+
+		# Create a label in front of the entry
+		self.urllabel = Label(self.topframe, {'text': 'URL:'})
+		self.urllabel.pack({'side': 'left'})
+
+		# Create the entry containing the URL
+		self.entry = Entry(self.topframe,
+				   {'relief': 'sunken', 'border': 2})
+		self.entry.pack({'side': 'left', 'fill': 'x', 'expand': 1})
+		self.entry.bind('<Return>', self.loadit)
+
+		# Create the button
+		self.reload = Button(self.topframe,
+				     {'text': 'Reload',
+				      'command': self.reload})
+		self.reload.pack({'side': 'right'})
+
+		# Create botframe for the text and scrollbar
+		self.botframe = Frame(self.root)
+		self.botframe.pack({'fill': 'both', 'expand': 1})
+
+		# The Scrollbar *must* be created first
+		self.vbar = Scrollbar(self.botframe)
+		self.vbar.pack({'fill': 'y', 'side': 'right'})
+		self.text = Text(self.botframe)
+		self.text.pack({'expand': 1, 'fill': 'both', 'side': 'left'})
+
+		# Link Text widget and Scrollbar
+		self.text['yscrollcommand'] = (self.vbar, 'set')
+		self.vbar['command'] = (self.text, 'yview')
+
+		self.url = None
+
+	def load(self, url):
+		# Load a new URL into the window
+		fp, url = self.urlopen(url)
+		if not fp:
+			return
+
+		self.url = url
+
+		self.root.title(url)
+
+		self.entry.delete('0', 'end')
+		self.entry.insert('end', url)
+
+		self.text.delete('0.0', 'end')
+
+		f = tkfmt.TkFormatter(self.text)
+		p = htmllib.FormattingParser(f, htmllib.X11Stylesheet)
+
+		while 1:
+			line = fp.readline()
+			if not line: break
+			if line[-2:] == '\r\n': line = line[:-2] + '\n'
+			p.feed(line)
+			self.root.update_idletasks()
+
+		p.close()
+
+		fp.close()
+
+	def urlopen(self, url):
+		# Open a URL --
+		# return (fp, url) if successful
+		# display dialog and return (None, url) for errors
+		try:
+			fp = urllib.urlopen(url)
+		except IOError, msg:
+			import types
+			if type(msg) == types.TupleType and len(msg) == 4:
+				if msg[1] == 302:
+					m = msg[3]
+					if m.has_key('location'):
+						url = m['location']
+						return self.urlopen(url)
+					elif m.has_key('uri'):
+						url = m['uri']
+						return self.urlopen(url)
+			self.errordialog(IOError, msg)
+			fp = None
+		return fp, url
+
+	def errordialog(self, exc, msg):
+		# Display an error dialog -- return when the user clicks OK
+		Dialog.Dialog(self.root, {
+			'text': str(msg),
+			'title': exc,
+			'bitmap': 'error',
+			'default': 0,
+			'strings': ('OK',),
+			})
+
+	def go(self):
+		# Start Tk main loop
+		self.root.mainloop()
+
+	def reload(self, *args):
+		# Callback for Reload button
+		if self.url:
+			self.load(self.url)
+
+	def loadit(self, *args):
+		# Callback for <Return> event in entry
+		self.load(self.entry.get())
+
+	def new_command(self):
+		# File/New...
+		Viewer(self.master)
+
+	def clone_command(self):
+		# File/Clone
+		v = Viewer(self.master)
+		v.load(self.url)
+
+	def open_command(self):
+		# File/Open...
+		print "File/Open...: Not implemented"
+
+	def close_command(self):
+		# File/Close
+		self.destroy()
+
+	def quit_command(self):
+		# File/Quit
+		self.root.quit()
+
+	def destroy(self):
+		# Destroy this window
+		self.root.destroy()
+		if self.master is not self.root and not self.master.children:
+			self.master.quit()
+
+main()

Demo/tkinter/www/www2.py

+#! /usr/local/bin/python
+
+# www2.py -- print the contents of a URL on stdout
+# - error checking
+
+import sys
+import urllib
+import types
+
+def main():
+	if len(sys.argv) != 2 or sys.argv[1][:1] == '-':
+		print "Usage:", sys.argv[0], "url"
+		sys.exit(2)
+	url = sys.argv[1]
+	fp = my_urlopen(url)
+	while 1:
+		line = fp.readline()
+		if not line: break
+		sys.stdout.write(line)
+
+def my_urlopen(url):
+	try:
+		fp = urllib.urlopen(url)
+		return fp
+	except IOError, msg:
+		if type(msg) == types.TupleType and len(msg) == 4:
+			print msg[:3]
+			m = msg[3]
+			for line in m.headers:
+				sys.stdout.write(line)
+		else:
+			print msg
+		sys.exit(1)
+
+main()

Demo/tkinter/www/www3.py

+#! /usr/local/bin/python
+
+# www3.py -- print the contents of a URL on stdout
+# - error checking
+# - Error 302 handling
+
+import sys
+import urllib
+import types
+
+def main():
+	if len(sys.argv) != 2 or sys.argv[1][:1] == '-':
+		print "Usage:", sys.argv[0], "url"
+		sys.exit(2)
+	url = sys.argv[1]
+	fp = my_urlopen(url)
+	while 1:
+		line = fp.readline()
+		if not line: break
+		sys.stdout.write(line)
+
+def my_urlopen(url):
+	try:
+		fp = urllib.urlopen(url)
+		return fp
+	except IOError, msg:
+		if type(msg) == types.TupleType and len(msg) == 4:
+			m = msg[3]
+			if msg[1] == 302:
+				if m.has_key('location'):
+					url = m['location']
+					print 'Location:', url
+					return my_urlopen(url)
+				elif m.has_key('uri'):
+					url = m['uri']
+					print 'URI:', url
+					return my_urlopen(url)
+				print '(Error 302 w/o Location/URI header???)'
+			print msg[:3]
+			for line in m.headers:
+				sys.stdout.write(line)
+		else:
+			print msg
+		sys.exit(1)
+
+main()

Demo/tkinter/www/www4.py

+#! /usr/local/bin/python
+
+# www4.py -- display the contents of a URL in a Text widget
+
+import sys
+import urllib
+from Tkinter import *
+
+def main():
+	if len(sys.argv) != 2 or sys.argv[1][:1] == '-':
+		print "Usage:", sys.argv[0], "url"
+		sys.exit(2)
+	url = sys.argv[1]
+	fp = urllib.urlopen(url)
+
+	text = Text()			# Create text widget
+	text.pack()			# Realize it
+
+	while 1:
+		line = fp.readline()
+		if not line: break
+		text.insert('end', line)	# Append line to text widget
+
+	text.mainloop()			# Start Tk main loop
+
+main()

Demo/tkinter/www/www5.py

+#! /usr/local/bin/python
+
+# www5.py -- display the contents of a URL in a Text widget
+# - set window title
+
+import sys
+import urllib
+from Tkinter import *
+
+def main():
+	if len(sys.argv) != 2 or sys.argv[1][:1] == '-':
+		print "Usage:", sys.argv[0], "url"
+		sys.exit(2)
+	url = sys.argv[1]
+	fp = urllib.urlopen(url)
+
+	root = Tk()
+	root.title(url)			# Set window manager title
+	text = Text(root)
+	text.pack()
+
+	while 1:
+		line = fp.readline()
+		if not line: break
+		text.insert('end', line)
+
+	text.mainloop()
+
+main()

Demo/tkinter/www/www6.py

+#! /usr/local/bin/python
+
+# www6.py -- display the contents of a URL in a Text widget
+# - set window title
+# - make window resizable
+
+import sys
+import urllib
+from Tkinter import *
+
+def main():
+	if len(sys.argv) != 2 or sys.argv[1][:1] == '-':
+		print "Usage:", sys.argv[0], "url"
+		sys.exit(2)
+	url = sys.argv[1]
+	fp = urllib.urlopen(url)
+
+	root = Tk()
+	root.title(url)
+	root.minsize(1, 1)		# Set minimum size
+	text = Text(root)
+	text.pack({'expand': 1, 'fill': 'both'}) # Expand into available space
+
+	while 1:
+		line = fp.readline()
+		if not line: break
+		text.insert('end', line)
+
+	root.mainloop()			# Start Tk main loop (for root!)
+
+main()

Demo/tkinter/www/www7.py

+#! /usr/local/bin/python
+
+# www7.py -- display the contents of a URL in a Text widget
+# - set window title
+# - make window resizable
+# - update display while reading
+
+import sys
+import urllib
+from Tkinter import *
+
+def main():
+	if len(sys.argv) != 2 or sys.argv[1][:1] == '-':
+		print "Usage:", sys.argv[0], "url"
+		sys.exit(2)
+	url = sys.argv[1]
+	fp = urllib.urlopen(url)
+
+	root = Tk()
+	root.title(url)
+	root.minsize(1, 1)
+	text = Text(root)
+	text.pack({'expand': 1, 'fill': 'both'})
+
+	while 1:
+		line = fp.readline()
+		if not line: break
+		text.insert('end', line)
+		root.update_idletasks()		# Update display
+
+	root.mainloop()
+
+main()

Demo/tkinter/www/www8.py

+#! /usr/local/bin/python
+
+# www8.py -- display the contents of a URL in a Text widget
+# - set window title
+# - make window resizable
+# - update display while reading
+# - vertical scroll bar
+
+import sys
+import urllib
+from Tkinter import *
+
+def main():
+	if len(sys.argv) != 2 or sys.argv[1][:1] == '-':
+		print "Usage:", sys.argv[0], "url"
+		sys.exit(2)
+	url = sys.argv[1]
+	fp = urllib.urlopen(url)
+
+	# Create root window
+	root = Tk()
+	root.title(url)
+	root.minsize(1, 1)
+
+	# The Scrollbar *must* be created first -- this is magic for me :-(
+	vbar = Scrollbar(root)
+	vbar.pack({'fill': 'y', 'side': 'right'})
+	text = Text(root, {'yscrollcommand': (vbar, 'set')})
+	text.pack({'expand': 1, 'fill': 'both', 'side': 'left'})
+
+	# Link Text widget and Scrollbar -- this is magic for you :-)
+	##text['yscrollcommand'] = (vbar, 'set')
+	vbar['command'] = (text, 'yview')
+
+	while 1:
+		line = fp.readline()
+		if not line: break
+		text.insert('end', line)
+		root.update_idletasks()
+
+	root.mainloop()
+
+main()

Demo/tkinter/www/www9.py

+#! /usr/local/bin/python
+
+# www9.py -- display the contents of a URL in a Text widget
+# - set window title
+# - make window resizable
+# - update display while reading
+# - vertical scroll bar
+# - rewritten as class
+
+import sys
+import urllib
+from Tkinter import *
+
+def main():
+	if len(sys.argv) != 2 or sys.argv[1][:1] == '-':
+		print "Usage:", sys.argv[0], "url"
+		sys.exit(2)
+	url = sys.argv[1]
+	viewer = Viewer()
+	viewer.load(url)
+	viewer.go()
+
+class Viewer:
+
+	def __init__(self):
+		# Create root window
+		self.root = Tk()
+		self.root.minsize(1, 1)
+
+		# The Scrollbar *must* be created first
+		self.vbar = Scrollbar(self.root)
+		self.vbar.pack({'fill': 'y', 'side': 'right'})
+		self.text = Text(self.root)
+		self.text.pack({'expand': 1, 'fill': 'both', 'side': 'left'})
+
+		# Link Text widget and Scrollbar
+		self.text['yscrollcommand'] = (self.vbar, 'set')
+		self.vbar['command'] = (self.text, 'yview')
+
+	def load(self, url):
+		# Load a new URL into the window
+		fp = urllib.urlopen(url)
+
+		self.root.title(url)
+
+		self.text.delete('0.0', 'end')
+
+		while 1:
+			line = fp.readline()
+			if not line: break
+			self.text.insert('end', line)
+			self.root.update_idletasks()
+
+		fp.close()
+
+	def go(self):
+		# Start Tk main loop
+		self.root.mainloop()
+
+main()