gajim-plural/src/htmltextview.py

### Copyright (C) 2005 Gustavo J. A. M. Carneiro
### Copyright (C) 2006 Santiago Gala
###
### This library is free software; you can redistribute it and/or
### modify it under the terms of the GNU Lesser General Public
### License as published by the Free Software Foundation; either
### version 2 of the License, or (at your option) any later version.
###
### This library is distributed in the hope that it will be useful,
### but WITHOUT ANY WARRANTY; without even the implied warranty of
### MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
### Lesser General Public License for more details.
###
### You should have received a copy of the GNU Lesser General Public
### License along with this library; if not, write to the
### Free Software Foundation, Inc., 59 Temple Place - Suite 330,
### Boston, MA 02111-1307, USA.


"""
A gtk.TextView-based renderer for XHTML-IM, as described in:
  http://www.jabber.org/jeps/jep-0071.html

Starting with the version posted by Gustavo Carneiro,
I (Santiago Gala) am trying to make it more compatible
with the markup that docutils generate, and also more
modular.

"""

import gobject
import pango
import gtk
import xml.sax, xml.sax.handler
import re
import warnings
from cStringIO import StringIO
import urllib2
import operator

from common import gajim
#from common import i18n


import tooltips


__all__ = ['HtmlTextView']

whitespace_rx = re.compile("\\s+")
allwhitespace_rx = re.compile("^\\s*$")

## pixels = points * display_resolution
display_resolution = 0.3514598*(gtk.gdk.screen_height() /
					float(gtk.gdk.screen_height_mm()))

#embryo of CSS classes
classes = {
	#'system-message':';display: none',
	'problematic':';color: red',
}

#styles for elemens
element_styles = {
		'u'			: ';text-decoration: underline',
		'em'		: ';font-style: oblique',
		'cite'		: '; background-color:rgb(170,190,250); font-style: oblique',
		'li'		: '; margin-left: 1em; margin-right: 10%',
		'strong'	: ';font-weight: bold',
		'pre'		: '; background-color:rgb(190,190,190); font-family: monospace; white-space: pre; margin-left: 1em; margin-right: 10%',
		'kbd'		: ';background-color:rgb(210,210,210);font-family: monospace',
		'blockquote': '; background-color:rgb(170,190,250); margin-left: 2em; margin-right: 10%',
		'dt'		: ';font-weight: bold; font-style: oblique',
		'dd'		: ';margin-left: 2em; font-style: oblique'
}
# no difference for the moment
element_styles['dfn'] = element_styles['em']
element_styles['var'] = element_styles['em']
# deprecated, legacy, presentational
element_styles['tt']  = element_styles['kbd']
element_styles['i']   = element_styles['em']
element_styles['b']   = element_styles['strong']

class_styles = {
}

"""
==========
  JEP-0071
==========

This Integration Set includes a subset of the modules defined for 
XHTML 1.0 but does not redefine any existing modules, nor 
does it define any new modules. Specifically, it includes the 
following modules only:

- Structure
- Text
  
  * Block
    
    phrasal
       addr, blockquote, pre
    Struc
       div,p
    Heading
       h1, h2, h3, h4, h5, h6
    
  * Inline
    
    phrasal
       abbr, acronym, cite, code, dfn, em, kbd, q, samp, strong, var
    structural
       br, span
  
- Hypertext (a)
- List (ul, ol, dl)
- Image (img)
- Style Attribute
     
Therefore XHTML-IM uses the following content models:

  Block.mix
            Block-like elements, e.g., paragraphs
  Flow.mix
            Any block or inline elements
  Inline.mix
            Character-level elements
  InlineNoAnchor.class
			Anchor element 
  InlinePre.mix
            Pre element

XHTML-IM also uses the following Attribute Groups:

Core.extra.attrib
	TBD
I18n.extra.attrib
	TBD
Common.extra
	style


...
#block level:
#Heading    h
#           ( pres           = h1 | h2 | h3 | h4 | h5 | h6 )
#Block      ( phrasal        = address | blockquote | pre )
#NOT           ( presentational = hr )
#           ( structural     = div | p )
#other:     section
#Inline     ( phrasal        = abbr | acronym | cite | code | dfn | em | kbd | q | samp | strong | var )
#NOT        ( presentational =  b  | big | i | small | sub | sup | tt )
#           ( structural     =  br | span )
#Param/Legacy    param, font, basefont, center, s, strike, u, dir, menu, isindex
#
"""

BLOCK_HEAD = set(( 'h1', 'h2', 'h3', 'h4', 'h5', 'h6', ))
BLOCK_PHRASAL = set(( 'address', 'blockquote', 'pre', ))
BLOCK_PRES = set(( 'hr', )) #not in xhtml-im
BLOCK_STRUCT = set(( 'div', 'p', ))
BLOCK_HACKS = set(( 'table', 'tr' )) # at the very least, they will start line ;)
BLOCK = BLOCK_HEAD.union(BLOCK_PHRASAL).union(BLOCK_STRUCT).union(BLOCK_PRES).union(BLOCK_HACKS)

INLINE_PHRASAL = set('abbr, acronym, cite, code, dfn, em, kbd, q, samp, strong, var'.split(', '))
INLINE_PRES = set('b, i, u, tt'.split(', ')) #not in xhtml-im
INLINE_STRUCT = set('br, span'.split(', '))
INLINE = INLINE_PHRASAL.union(INLINE_PRES).union(INLINE_STRUCT)

LIST_ELEMS = set( 'dl, ol, ul'.split(', '))

for name in BLOCK_HEAD:
	num = eval(name[1])
	size = (num-1) // 2
	weigth = (num - 1) % 2
	element_styles[name] = '; font-size: %s; %s' % ( ('large', 'medium', 'small')[size],
													('font-weight: bold', 'font-style: oblique')[weigth],
											  )


def build_patterns(view, config, interface):
	#extra, rst does not mark _underline_ or /it/ up
	#actually <b>, <i> or <u> are not in the JEP-0071, but are seen in the wild
	basic_pattern = r'(?<!\w|\<|/|:)' r'/[^\s/]' r'([^/]*[^\s/])?' r'/(?!\w|/|:)|'\
					r'(?<!\w)' r'_[^\s_]' r'([^_]*[^\s_])?' r'_(?!\w)'
	view.basic_pattern_re = re.compile(basic_pattern)
	#TODO: emoticons
	emoticons_pattern = ''
	if config.get('emoticons_theme'):
		# When an emoticon is bordered by an alpha-numeric character it is NOT
		# expanded.  e.g., foo:) NO, foo :) YES, (brb) NO, (:)) YES, etc.
		# We still allow multiple emoticons side-by-side like :P:P:P
		# sort keys by length so :qwe emot is checked before :q
		keys = interface.emoticons.keys()
		keys.sort(interface.on_emoticon_sort)
		emoticons_pattern_prematch = ''
		emoticons_pattern_postmatch = ''
		emoticon_length = 0
		for emoticon in keys: # travel thru emoticons list
			emoticon_escaped = re.escape(emoticon) # espace regexp metachars
			emoticons_pattern += emoticon_escaped + '|'# | means or in regexp
			if (emoticon_length != len(emoticon)):
				# Build up expressions to match emoticons next to other emoticons
				emoticons_pattern_prematch  = emoticons_pattern_prematch[:-1]  + ')|(?<='
				emoticons_pattern_postmatch = emoticons_pattern_postmatch[:-1] + ')|(?='
				emoticon_length = len(emoticon)
			emoticons_pattern_prematch += emoticon_escaped  + '|'
			emoticons_pattern_postmatch += emoticon_escaped + '|'
		# We match from our list of emoticons, but they must either have
		# whitespace, or another emoticon next to it to match successfully
		# [\w.] alphanumeric and dot (for not matching 8) in (2.8))
		emoticons_pattern = '|' + \
			'(?:(?<![\w.]' + emoticons_pattern_prematch[:-1]   + '))' + \
			'(?:'       + emoticons_pattern[:-1]            + ')'  + \
			'(?:(?![\w.]'  + emoticons_pattern_postmatch[:-1]  + '))'

	# because emoticons match later (in the string) they need to be after
	# basic matches that may occur earlier
	emot_and_basic_pattern = basic_pattern + emoticons_pattern
	view.emot_and_basic_re = re.compile(emot_and_basic_pattern, re.IGNORECASE)


def _parse_css_color(color):
	'''_parse_css_color(css_color) -> gtk.gdk.Color'''
	if color.startswith("rgb(") and color.endswith(')'):
		r, g, b = [int(c)*257 for c in color[4:-1].split(',')]
		return gtk.gdk.Color(r, g, b)
	else:
		return gtk.gdk.color_parse(color)
	

class HtmlHandler(xml.sax.handler.ContentHandler):
	
	def __init__(self, textview, startiter):
		xml.sax.handler.ContentHandler.__init__(self)
		self.textbuf = textview.get_buffer()
		self.textview = textview
		self.iter = startiter
		self.text = ''
		self.starting=True
		self.preserve = False
		self.styles = [] # a gtk.TextTag or None, for each span level
		self.list_counters = [] # stack (top at head) of list
								# counters, or None for unordered list

	def _parse_style_color(self, tag, value):
		color = _parse_css_color(value)
		tag.set_property("foreground-gdk", color)

	def _parse_style_background_color(self, tag, value):
		color = _parse_css_color(value)
		tag.set_property("background-gdk", color)
		if gtk.gtk_version >= (2, 8):
			tag.set_property("paragraph-background-gdk", color)


	if gtk.gtk_version >= (2, 8, 5) or gobject.pygtk_version >= (2, 8, 1):

		def _get_current_attributes(self):
			attrs = self.textview.get_default_attributes()
			self.iter.backward_char()
			self.iter.get_attributes(attrs)
			self.iter.forward_char()
			return attrs
		
	else:
		
		## Workaround http://bugzilla.gnome.org/show_bug.cgi?id=317455
		def _get_current_style_attr(self, propname, comb_oper=None):
			tags = [tag for tag in self.styles if tag is not None]
			tags.reverse()
			is_set_name = propname + "-set"
			value = None
			for tag in tags:
				if tag.get_property(is_set_name):
					if value is None:
						value = tag.get_property(propname)
						if comb_oper is None:
							return value
					else:
						value = comb_oper(value, tag.get_property(propname))
			return value

		class _FakeAttrs(object):
			__slots__ = ("font", "font_scale")

		def _get_current_attributes(self):
			attrs = self._FakeAttrs()
			attrs.font_scale = self._get_current_style_attr("scale",
															operator.mul)
			if attrs.font_scale is None:
				attrs.font_scale = 1.0
			attrs.font = self._get_current_style_attr("font-desc")
			if attrs.font is None:
				attrs.font = self.textview.style.font_desc
			return attrs


	def __parse_length_frac_size_allocate(self, textview, allocation,
										  frac, callback, args):
		callback(allocation.width*frac, *args)

	def _parse_length(self, value, font_relative, callback, *args):
		'''Parse/calc length, converting to pixels, calls callback(length, *args)
		when the length is first computed or changes'''
		if value.endswith('%'):
			frac = float(value[:-1])/100
			if font_relative:
				attrs = self._get_current_attributes()
				font_size = attrs.font.get_size() / pango.SCALE
				callback(frac*display_resolution*font_size, *args)
			else:
				## CSS says "Percentage values: refer to width of the closest
				##           block-level ancestor"
				## This is difficult/impossible to implement, so we use
				## textview width instead; a reasonable approximation..
				alloc = self.textview.get_allocation()
				self.__parse_length_frac_size_allocate(self.textview, alloc,
													   frac, callback, args)
				self.textview.connect("size-allocate",
									  self.__parse_length_frac_size_allocate,
									  frac, callback, args)

		elif value.endswith('pt'): # points
			callback(float(value[:-2])*display_resolution, *args)

		elif value.endswith('em'): # ems, the height of the element's font
			attrs = self._get_current_attributes()
			font_size = attrs.font.get_size() / pango.SCALE
			callback(float(value[:-2])*display_resolution*font_size, *args)

		elif value.endswith('ex'): # x-height, ~ the height of the letter 'x'
			## FIXME: figure out how to calculate this correctly
			##        for now 'em' size is used as approximation
			attrs = self._get_current_attributes()
			font_size = attrs.font.get_size() / pango.SCALE
			callback(float(value[:-2])*display_resolution*font_size, *args)

		elif value.endswith('px'): # pixels
			callback(int(value[:-2]), *args)

		else:
			warnings.warn("Unable to parse length value '%s'" % value)
		
	def __parse_font_size_cb(length, tag):
		tag.set_property("size-points", length/display_resolution)
	__parse_font_size_cb = staticmethod(__parse_font_size_cb)

	def _parse_style_display(self, tag, value):
		if value == 'none':
			tag.set_property('invisible','true')
		#Fixme: display: block, inline

	def _parse_style_font_size(self, tag, value):
		try:
			scale = {
				"xx-small": pango.SCALE_XX_SMALL,
				"x-small": pango.SCALE_X_SMALL,
				"small": pango.SCALE_SMALL,
				"medium": pango.SCALE_MEDIUM,
				"large": pango.SCALE_LARGE,
				"x-large": pango.SCALE_X_LARGE,
				"xx-large": pango.SCALE_XX_LARGE,
				} [value]
		except KeyError:
			pass
		else:
			attrs = self._get_current_attributes()
			tag.set_property("scale", scale / attrs.font_scale)
			return
		if value == 'smaller':
			tag.set_property("scale", pango.SCALE_SMALL)
			return
		if value == 'larger':
			tag.set_property("scale", pango.SCALE_LARGE)
			return
		self._parse_length(value, True, self.__parse_font_size_cb, tag)

	def _parse_style_font_style(self, tag, value):
		try:
			style = {
				"normal": pango.STYLE_NORMAL,
				"italic": pango.STYLE_ITALIC,
				"oblique": pango.STYLE_OBLIQUE,
				} [value]
		except KeyError:
			warnings.warn("unknown font-style %s" % value)
		else:
			tag.set_property("style", style)

	def __frac_length_tag_cb(self,length, tag, propname):
		styles = self._get_style_tags()
		if styles:
			length += styles[-1].get_property(propname)
		tag.set_property(propname, length)
	#__frac_length_tag_cb = staticmethod(__frac_length_tag_cb)
		
	def _parse_style_margin_left(self, tag, value):
		self._parse_length(value, False, self.__frac_length_tag_cb,
						   tag, "left-margin")

	def _parse_style_margin_right(self, tag, value):
		self._parse_length(value, False, self.__frac_length_tag_cb,
						   tag, "right-margin")

	def _parse_style_font_weight(self, tag, value):
		## TODO: missing 'bolder' and 'lighter'
		try:
			weight = {
				'100': pango.WEIGHT_ULTRALIGHT,
				'200': pango.WEIGHT_ULTRALIGHT,
				'300': pango.WEIGHT_LIGHT,
				'400': pango.WEIGHT_NORMAL,
				'500': pango.WEIGHT_NORMAL,
				'600': pango.WEIGHT_BOLD,
				'700': pango.WEIGHT_BOLD,
				'800': pango.WEIGHT_ULTRABOLD,
				'900': pango.WEIGHT_HEAVY,
				'normal': pango.WEIGHT_NORMAL,
				'bold': pango.WEIGHT_BOLD,
				} [value]
		except KeyError:
			warnings.warn("unknown font-style %s" % value)
		else:
			tag.set_property("weight", weight)

	def _parse_style_font_family(self, tag, value):
		tag.set_property("family", value)

	def _parse_style_text_align(self, tag, value):
		try:
			align = {
				'left': gtk.JUSTIFY_LEFT,
				'right': gtk.JUSTIFY_RIGHT,
				'center': gtk.JUSTIFY_CENTER,
				'justify': gtk.JUSTIFY_FILL,
				} [value]
		except KeyError:
			warnings.warn("Invalid text-align:%s requested" % value)
		else:
			tag.set_property("justification", align)
	
	def _parse_style_text_decoration(self, tag, value):
		if value == "none":
			tag.set_property("underline", pango.UNDERLINE_NONE)
			tag.set_property("strikethrough", False)
		elif value == "underline":
			tag.set_property("underline", pango.UNDERLINE_SINGLE)
			tag.set_property("strikethrough", False)
		elif value == "overline":
			warnings.warn("text-decoration:overline not implemented")
			tag.set_property("underline", pango.UNDERLINE_NONE)
			tag.set_property("strikethrough", False)
		elif value == "line-through":
			tag.set_property("underline", pango.UNDERLINE_NONE)
			tag.set_property("strikethrough", True)
		elif value == "blink":
			warnings.warn("text-decoration:blink not implemented")
		else:
			warnings.warn("text-decoration:%s not implemented" % value)
	
	def _parse_style_white_space(self, tag, value):
		if value == 'pre':
			tag.set_property("wrap_mode", gtk.WRAP_NONE)
		elif value == 'normal':
			tag.set_property("wrap_mode", gtk.WRAP_WORD)
		elif value == 'nowrap':
			tag.set_property("wrap_mode", gtk.WRAP_NONE)
	 
	
	## build a dictionary mapping styles to methods, for greater speed
	__style_methods = dict()
	for style in ["background-color", "color", "font-family", "font-size",
				  "font-style", "font-weight", "margin-left", "margin-right",
				  "text-align", "text-decoration", "white-space", 'display' ]:
		try:
			method = locals()["_parse_style_%s" % style.replace('-', '_')]
		except KeyError:
			warnings.warn("Style attribute '%s' not yet implemented" % style)
		else:
			__style_methods[style] = method
	del style
	## --

	def _get_style_tags(self):
		return [tag for tag in self.styles if tag is not None]

	def _create_url(self, href, title, type_, id_):
		tag = self.textbuf.create_tag(id_)
		if href and href[0] != '#':
			tag.href = href
			tag.type_ = type_ # to be used by the URL handler
			tag.connect('event', self.textview.html_hyperlink_handler, 'url', href)
			tag.set_property('foreground', '#0000ff')
			tag.set_property('underline', pango.UNDERLINE_SINGLE)
			tag.is_anchor = True
		if title:
			tag.title = title
		return tag


	def _begin_span(self, style, tag=None, id_=None):
		if style is None:
			self.styles.append(tag)
			return None
		if tag is None:
			if id_:
				tag = self.textbuf.create_tag(id_)
			else:
				tag = self.textbuf.create_tag() # we create anonymous tag
		for attr, val in [item.split(':', 1) for item in style.split(';') if len(item.strip())]:
			attr = attr.strip().lower()
			val = val.strip()
			try:
				method = self.__style_methods[attr]
			except KeyError:
				warnings.warn("Style attribute '%s' requested "
							  "but not yet implemented" % attr)
			else:
				method(self, tag, val)
		self.styles.append(tag)

	def _end_span(self):
		self.styles.pop()

	def _jump_line(self):
		self.textbuf.insert_with_tags_by_name(self.iter, '\n', 'eol')
		self.starting = True

	def _insert_text(self, text):
		if self.starting and text != '\n':
			self.starting = (text[-1] == '\n')
		tags = self._get_style_tags()
		if tags:
			self.textbuf.insert_with_tags(self.iter, text, *tags)
		else:
			self.textbuf.insert(self.iter, text)

	def _starts_line(self):
		return self.starting or self.iter.starts_line()
		
	def _flush_text(self):
		if not self.text: return
		text, self.text = self.text, ''
		if not self.preserve:
			text = text.replace('\n', ' ')
			self.handle_specials(whitespace_rx.sub(' ', text))
		else:
			self._insert_text(text.strip("\n"))

	def _anchor_event(self, tag, textview, event, iter, href, type_):
		if event.type == gtk.gdk.BUTTON_PRESS:
			self.textview.emit("url-clicked", href, type_)
			return True
		return False

	def handle_specials(self, text):
		index = 0
		se = self.textview.config.get('show_ascii_formatting_chars')
		if self.textview.config.get('emoticons_theme'):
			iterator = self.textview.emot_and_basic_re.finditer(text)
		else:
			iterator = self.textview.basic_pattern_re.finditer(text)
		for match in iterator:
			start, end = match.span()
			special_text = text[start:end]
			if start != 0:
				self._insert_text(text[index:start])
			index = end # update index
			#emoticons
			possible_emot_ascii_caps = special_text.upper() # emoticons keys are CAPS
			if self.textview.config.get('emoticons_theme') and \
					possible_emot_ascii_caps in self.textview.interface.emoticons.keys():
				#it's an emoticon
				emot_ascii = possible_emot_ascii_caps
				anchor = self.textbuf.create_child_anchor(self.iter)
				img = gtk.Image()
				img.set_from_file(self.textview.interface.emoticons[emot_ascii])
				img.show()
				# TODO: add alt/tooltip with the special_text (a11y) 
				self.textview.add_child_at_anchor(img, anchor)
			else:
				# now print it
				if special_text.startswith('/'): # it's explicit italics
					self.startElement('i', {})
				elif special_text.startswith('_'): # it's explicit underline
					self.startElement("u", {})
				if se: self._insert_text(special_text[0])
				self.handle_specials(special_text[1:-1])
				if se: self._insert_text(special_text[0])
				if special_text.startswith('_'): # it's explicit underline
					self.endElement('u')
				if special_text.startswith('/'): # it's explicit italics
					self.endElement('i')
		if index < len(text):
			self._insert_text(text[index:])
		
	def characters(self, content):
		if self.preserve:
			self.text += content
			return
		if allwhitespace_rx.match(content) is not None and self._starts_line():
			return
		self.text += content
		self.starting = False


	def startElement(self, name, attrs):
		self._flush_text()
		klass = [i for i in attrs.get('class',' ').split(' ') if i]
		style = attrs.get('style','')
		#Add styles defined for classes
		#TODO: priority between class and style elements?
		for k in klass:
			if k  in classes:
				style += classes[k]

		tag = None
		#FIXME: if we want to use id, it needs to be unique across
		# the whole textview, so we need to add something like the
		# message-id to it.
		#id_ = attrs.get('id',None) 
		id_ = None
		if name == 'a':
			#TODO: accesskey, charset, hreflang, rel, rev, tabindex, type
			href = attrs.get('href', None)
			if not href:
				href = attrs.get('HREF', None)
			# Gaim sends HREF instead of href
			title = attrs.get('title', attrs.get('rel',href))
			type_ = attrs.get('type', None)
			tag = self._create_url(href, title, type_, id_)
		elif name == 'blockquote':
			cite = attrs.get('cite', None)
			if cite:
				tag = self.textbuf.create_tag(id_)
				tag.title = title
				tag.is_anchor = True
		elif name in LIST_ELEMS:
			style += ';margin-left: 2em'
		if name in element_styles:
			style += element_styles[name]

		if style == '':
			style = None        
		self._begin_span(style, tag, id_)

		if name == 'br':
			pass # handled in endElement
		elif name == 'hr':
			pass # handled in endElement
		elif name in BLOCK:
			if not self._starts_line():
				self._jump_line()
			if name == 'pre':
				self.preserve = True
		elif name == 'span':
			pass
		elif name in ('dl', 'ul'):
			if not self._starts_line():
				self._jump_line()
			self.list_counters.append(None)
		elif name == 'ol':
			if not self._starts_line():
				self._jump_line()
			self.list_counters.append(0)
		elif name == 'li':
			if self.list_counters[-1] is None:
				li_head = unichr(0x2022)
			else:
				self.list_counters[-1] += 1
				li_head = "%i." % self.list_counters[-1]
			self.text = ' '*len(self.list_counters)*4 + li_head + ' '
			self._flush_text()
			self.starting = True
		elif name == 'dd':
			self._jump_line()
		elif name == 'dt':
			if not self.starting:
				self._jump_line()
		elif name == 'img':
			try:
				## Max image size = 2 MB (to try to prevent DoS)
				mem = urllib2.urlopen(attrs['src']).read(2*1024*1024)
				## Caveat: GdkPixbuf is known not to be safe to load
				## images from network... this program is now potentially
				## hackable ;)
				loader = gtk.gdk.PixbufLoader()
				loader.write(mem); loader.close()
				pixbuf = loader.get_pixbuf()
			except Exception, ex:
				gajim.log.debug(str('Error loading image'+ex))
				pixbuf = None
				alt = attrs.get('alt', "Broken image")
				try:
					loader.close()
				except: pass
			if pixbuf is not None:
				tags = self._get_style_tags()
				if tags:
					tmpmark = self.textbuf.create_mark(None, self.iter, True)

				self.textbuf.insert_pixbuf(self.iter, pixbuf)

				if tags:
					start = self.textbuf.get_iter_at_mark(tmpmark)
					for tag in tags:
						self.textbuf.apply_tag(tag, start, self.iter)
					self.textbuf.delete_mark(tmpmark)
			else:
				self._insert_text("[IMG: %s]" % alt)
		elif name == 'body' or name == 'html':
			pass
		elif name == 'a':
			pass
		elif name in INLINE:
			pass
		else:
			warnings.warn("Unhandled element '%s'" % name)

	def endElement(self, name):
		endPreserving = False
		newLine = False
		if name == 'br':
			newLine = True
		elif name == 'hr':
			#FIXME: plenty of unused attributes (width, height,...) :)
			self._jump_line()
			try:
				self.textbuf.insert_pixbuf(self.iter, self.textview.focus_out_line_pixbuf)
				#self._insert_text(u"\u2550"*40)
				self._jump_line()
			except Exception, e:
				gajim.log.debug(str("Error in hr"+e))
		elif name in LIST_ELEMS:
			self.list_counters.pop()
		elif name == 'li':
			newLine = True
		elif name == 'img':
			pass
		elif name == 'body' or name == 'html':
			pass
		elif name == 'a':
			pass
		elif name in INLINE:
			pass
		elif name in ('dd', 'dt', ):
			pass
		elif name in BLOCK:
			if name == 'pre':
				endPreserving = True
		else:
			warnings.warn("Unhandled element '%s'" % name)
		self._flush_text()
		if endPreserving:
			self.preserve = False
		if newLine:
			self._jump_line()
		self._end_span()
		#if not self._starts_line():
		#    self.text = ' '

class HtmlTextView(gtk.TextView):
	__gtype_name__ = 'HtmlTextView'
	__gsignals__ = {
		'url-clicked': (gobject.SIGNAL_RUN_LAST, None, (str, str)), # href, type
	}
	
	def __init__(self):
		gobject.GObject.__init__(self)
		self.set_wrap_mode(gtk.WRAP_CHAR)
		self.set_editable(False)
		self._changed_cursor = False
		self.connect("motion-notify-event", self.__motion_notify_event)
		self.connect("leave-notify-event", self.__leave_event)
		self.connect("enter-notify-event", self.__motion_notify_event)
		self.get_buffer().create_tag('eol', scale = pango.SCALE_XX_SMALL)
		self.tooltip = tooltips.BaseTooltip()
		self.config = gajim.config
		self.interface = gajim.interface
		# end big hack
		build_patterns(self,gajim.config,gajim.interface)

	def __leave_event(self, widget, event):
		if self._changed_cursor:
			window = widget.get_window(gtk.TEXT_WINDOW_TEXT)
			window.set_cursor(gtk.gdk.Cursor(gtk.gdk.XTERM))
			self._changed_cursor = False

	def show_tooltip(self, tag):
		if not self.tooltip.win:
			# check if the current pointer is still over the line
			x, y, _ = self.window.get_pointer()
			x, y = self.window_to_buffer_coords(gtk.TEXT_WINDOW_TEXT, x, y)
			tags = self.get_iter_at_location(x, y).get_tags()
			is_over_anchor = False
			for tag_ in tags:
				if getattr(tag_, 'is_anchor', False):
					is_over_anchor = True
					break
			if not is_over_anchor:
				return
			text = getattr(tag, 'title', False)
			if text:
				pointer = self.get_pointer()
				position = self.window.get_origin()
				self.tooltip.show_tooltip(text, 8, position[1] + pointer[1])

	def __motion_notify_event(self, widget, event):
		x, y, _ = widget.window.get_pointer()
		x, y = widget.window_to_buffer_coords(gtk.TEXT_WINDOW_TEXT, x, y)
		tags = widget.get_iter_at_location(x, y).get_tags()
		is_over_anchor = False
		for tag in tags:
			if getattr(tag, 'is_anchor', False):
				is_over_anchor = True
				break
		if self.tooltip.timeout != 0:
			# Check if we should hide the line tooltip
			if not is_over_anchor:
				self.tooltip.hide_tooltip()
		if not self._changed_cursor and is_over_anchor:
			window = widget.get_window(gtk.TEXT_WINDOW_TEXT)
			window.set_cursor(gtk.gdk.Cursor(gtk.gdk.HAND2))
			self._changed_cursor = True
			self.tooltip.timeout = gobject.timeout_add(500, self.show_tooltip, tag)
		elif self._changed_cursor and not is_over_anchor:
			window = widget.get_window(gtk.TEXT_WINDOW_TEXT)
			window.set_cursor(gtk.gdk.Cursor(gtk.gdk.XTERM))
			self._changed_cursor = False
		return False

	def display_html(self, html):
		buffer = self.get_buffer()
		eob = buffer.get_end_iter()
		## this works too if libxml2 is not available
		# parser = xml.sax.make_parser(['drv_libxml2'])
		# parser.setFeature(xml.sax.handler.feature_validation, True)
		parser = xml.sax.make_parser()
		parser.setContentHandler(HtmlHandler(self, eob))
		parser.parse(StringIO(html))
		
		#if not eob.starts_line():
		#    buffer.insert(eob, "\n")

if gobject.pygtk_version < (2, 8):
	gobject.type_register(HtmlTextView)

change_cursor = None

if __name__ == '__main__':

	htmlview = HtmlTextView()

	tooltip = tooltips.BaseTooltip()
	def on_textview_motion_notify_event(widget, event):
		'''change the cursor to a hand when we are over a mail or an url'''
		global change_cursor
		pointer_x, pointer_y, spam = htmlview.window.get_pointer()
		x, y = htmlview.window_to_buffer_coords(gtk.TEXT_WINDOW_TEXT, pointer_x,
								   pointer_y)
		tags = htmlview.get_iter_at_location(x, y).get_tags()
		if change_cursor:
			htmlview.get_window(gtk.TEXT_WINDOW_TEXT).set_cursor(
					 gtk.gdk.Cursor(gtk.gdk.XTERM))
			change_cursor = None
		tag_table = htmlview.get_buffer().get_tag_table()
		over_line = False
		for tag in tags:
			try:
				if tag.is_anchor:
					htmlview.get_window(gtk.TEXT_WINDOW_TEXT).set_cursor(
										gtk.gdk.Cursor(gtk.gdk.HAND2))
					change_cursor = tag
				elif tag == tag_table.lookup('focus-out-line'):
					over_line = True
			except: pass

		#if line_tooltip.timeout != 0:
			# Check if we should hide the line tooltip
		#	if not over_line:
		#		line_tooltip.hide_tooltip()
		#if over_line and not line_tooltip.win:
		#	line_tooltip.timeout = gobject.timeout_add(500,
		#		show_line_tooltip)
		#	htmlview.get_window(gtk.TEXT_WINDOW_TEXT).set_cursor(
		#		gtk.gdk.Cursor(gtk.gdk.LEFT_PTR))
		#	change_cursor = tag

	htmlview.connect('motion_notify_event', on_textview_motion_notify_event)

	def handler(texttag, widget, event, iter, kind, href):
		if event.type == gtk.gdk.BUTTON_PRESS:
			print href

	htmlview.html_hyperlink_handler = handler

	htmlview.display_html('<div><span style="color: red; text-decoration:underline">Hello</span><br/>\n'
						  '  <img src="http://images.slashdot.org/topics/topicsoftware.gif"/><br/>\n'
						  '  <span style="font-size: 500%; font-family: serif">World</span>\n'
						  '</div>\n')
	htmlview.display_html("<hr />")
	htmlview.display_html("""
	  <p style='font-size:large'>
		<span style='font-style: italic'>O<span style='font-size:larger'>M</span>G</span>, 
		I&apos;m <span style='color:green'>green</span>
		with <span style='font-weight: bold'>envy</span>!
	  </p>
		""")
	htmlview.display_html("<hr />")
	htmlview.display_html("""
	<body xmlns='http://www.w3.org/1999/xhtml'>
	  <p>As Emerson said in his essay <span style='font-style: italic; background-color:cyan'>Self-Reliance</span>:</p>
	  <p style='margin-left: 5px; margin-right: 2%'>
		&quot;A foolish consistency is the hobgoblin of little minds.&quot;
	  </p>
	</body>
		""")
	htmlview.display_html("<hr />")
	htmlview.display_html("""
	<body xmlns='http://www.w3.org/1999/xhtml'>
	  <p style='text-align:center'>Hey, are you licensed to <a href='http://www.jabber.org/'>Jabber</a>?</p>
	  <p style='text-align:right'><img src='http://www.jabber.org/images/psa-license.jpg'
			  alt='A License to Jabber'
			  height='261'
			  width='537'/></p>
	</body>
		""")
	htmlview.display_html("<hr />")
	htmlview.display_html("""
	<body xmlns='http://www.w3.org/1999/xhtml'>
	  <ul style='background-color:rgb(120,140,100)'>
	   <li> One </li>
	   <li> Two </li>
	   <li> Three </li>
	  </ul><hr /><pre style="background-color:rgb(120,120,120)">def fac(n):
  def faciter(n,acc): 
	if n==0: return acc
	return faciter(n-1, acc*n)
  if n&lt;0: raise ValueError("Must be non-negative")
  return faciter(n,1)</pre>
	</body>
		""")
	htmlview.display_html("<hr />")
	htmlview.display_html("""
	<body xmlns='http://www.w3.org/1999/xhtml'>
	 <ol style='background-color:rgb(120,140,100)'>
	   <li> One </li>
	   <li> Two is nested: <ul style='background-color:rgb(200,200,100)'>
			 <li> One </li>
			 <li> Two </li>
			 <li> Three </li>
			</ul></li>
	   <li> Three </li></ol>
	</body>
		""")
	htmlview.show()
	sw = gtk.ScrolledWindow()
	sw.set_property("hscrollbar-policy", gtk.POLICY_AUTOMATIC)
	sw.set_property("vscrollbar-policy", gtk.POLICY_AUTOMATIC)
	sw.set_property("border-width", 0)
	sw.add(htmlview)
	sw.show()
	frame = gtk.Frame()
	frame.set_shadow_type(gtk.SHADOW_IN)
	frame.show()
	frame.add(sw)
	w = gtk.Window()
	w.add(frame)
	w.set_default_size(400, 300)
	w.show_all()
	w.connect("destroy", lambda w: gtk.main_quit())
	gtk.main()