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R3600/invenio/utils/htmlwasher.py
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htmlwasher.py
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# -*- coding: utf-8 -*-
##
## This file is part of Invenio.
## Copyright (C) 2010, 2011, 2012, 2013 CERN.
##
## Invenio is free software; you can redistribute it and/or
## modify it under the terms of the GNU General Public License as
## published by the Free Software Foundation; either version 2 of the
## License, or (at your option) any later version.
##
## Invenio 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
## General Public License for more details.
##
## You should have received a copy of the GNU General Public License
## along with Invenio; if not, write to the Free Software Foundation, Inc.,
## 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
from invenio.utils.html import HTMLWasher
import htmlentitydefs
import cgi
import re
RE_HTML_FIRST_NON_QUOTATION_CHAR_ON_LINE = re.compile('[^>]')
class EmailWasher(HTMLWasher):
"""
Wash comments before being sent by email
"""
line_quotation = ''
def handle_starttag(self, tag, attrs):
"""Function called for new opening tags"""
if tag.lower() in self.allowed_tag_whitelist:
if tag.lower() == 'ol':
# we need a list to store the last
# number used in the previous ordered lists
self.previous_nbs.append(self.nb)
self.nb = 0
# we need to know which is the tag list
self.previous_type_lists.append(tag.lower())
# we must remove any non-relevant spacing and end of
# line before
self.result = self.result.rstrip()
elif tag.lower() == 'ul':
self.previous_type_lists.append(tag.lower())
# we must remove any non-relevant spacing and end of
# line before
self.result = self.result.rstrip()
elif tag.lower() == 'li':
# we must remove any non-relevant spacing and end of
# line before
self.result = self.result.rstrip()
if self.previous_type_lists[-1] == 'ol':
self.nb += 1
self.result += '\n' + self.line_quotation + \
' ' * len(self.previous_type_lists) + str(self.nb) + '. '
else:
self.result += '\n' + self.line_quotation + \
' ' * len(self.previous_type_lists) + '* '
elif tag.lower() == 'a':
#self.previous_type_lists.append(tag.lower())
for (attr, value) in attrs:
if attr.lower() == 'href':
self.url = value
self.result += '<' + value + '>'
def handle_data(self, data):
"""Function called for text nodes"""
if not self.silent:
if self.url:
if self.url == data:
data = ''
else:
data = '(' + data + ')'
self.url = ''
self.result += cgi.escape(data, True)
lines = data.splitlines()
if len(lines) > 1:
match_obj = RE_HTML_FIRST_NON_QUOTATION_CHAR_ON_LINE.search(lines[-1])
if match_obj:
self.line_quotation = '&gt;' * match_obj.start()
else:
self.line_quotation = ''
def handle_endtag(self, tag):
"""Function called for ending of tags"""
if tag.lower() in self.allowed_tag_whitelist:
if tag.lower() in ['ul', 'ol']:
self.previous_type_lists = self.previous_type_lists[:-1]
if tag.lower() == 'ol':
self.nb = self.previous_nbs[-1]
self.previous_nbs = self.previous_nbs[:-1]
# we must remove any non-relevant spacing and end of
# line before
self.result = self.result.rstrip()
self.result += '\n' + self.line_quotation
def handle_startendtag(self, tag, attrs):
"""Function called for empty tags (e.g. <br />)"""
self.result += ""
def handle_charref(self, name):
"""Process character references of the form "&#ref;". Transform to text whenever possible."""
try:
self.result += unichr(int(name)).encode("utf-8")
except:
return
def handle_entityref(self, name):
"""Process a general entity reference of the form "&name;".
Transform to text whenever possible."""
char_code = htmlentitydefs.name2codepoint.get(name, None)
if char_code is not None:
try:
self.result += unichr(char_code).encode("utf-8")
except:
return
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