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=begin
Feed2Imap - RSS/Atom Aggregator uploading to an IMAP Server
Copyright (c) 2005 Lucas Nussbaum <lucas@lucas-nussbaum.net>
This program 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.
This program 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 this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
=end
require 'uri' # for URI::regexp
require 'feed2imap/html2text-parser'
# This class provides various converters
class String
# is this text HTML ? search for tags
def html?
return (self =~ /<p>/) || (self =~ /<br>/) || (self =~ /<br\s*(\/)?\s*>/)
end
# returns true if the text contains escaped HTML (with HTML entities)
def escaped_html?
return (self =~ /<img src=/) || (self =~ /<a href=/) || (self =~ /<br(\/| \/|)>/)
end
# un-escape HTML in the text
def unescape_html
{
'<' => '<',
'>' => '>',
"'" => ''',
'"' => '"',
'&' => '&',
"\047" => '''
}.each do |k, v|
gsub!(v, k)
end
self
end
# convert text to HTML
def text2html
text = self.clone
return text if text.html?
if text.escaped_html?
return text.unescape_html
end
# paragraphs
text.gsub!(/\A\s*(.*)\Z/m, '<p>\1</p>')
text.gsub!(/\s*\n(\s*\n)+\s*/, "</p>\n<p>")
# uris
text.gsub!(/(#{URI::regexp(['http','ftp','https'])})/,
'<a href="\1">\1</a>')
text
end
# Convert an HTML text to plain text
def html2text
if false
text = self.clone
# let's remove all CR
text.gsub!(/\n/, '')
# convert <p> and <br>
text.gsub!(/\s*<\/p>\s*/, '')
text.gsub!(/\s*<p(\s[^>]*)?>\s*/, "\n\n")
text.gsub!(/\s*<br(\s*)\/?(\s*)>\s*/, "\n")
# remove other tags
text.gsub!(/<[^>]*>/, '')
# remove leading and trailing whilespace
text.gsub!(/\A\s*/m, '')
text.gsub!(/\s*\Z/m, '')
text
else
text = self.clone
# parse HTML
p = HTML2TextParser::new(true)
p.feed(text)
p.close
text = p.savedata
# remove leading and trailing whilespace
text.gsub!(/\A\s*/m, '')
text.gsub!(/\s*\Z/m, '')
# remove whitespace around \n
text.gsub!(/ *\n/m, "\n")
text.gsub!(/\n */m, "\n")
# and duplicates \n
text.gsub!(/\n\n+/m, "\n\n")
text
end
end
# Remove white space around the text
def rmWhiteSpace!
return self.gsub!(/\A\s*/m, '').gsub!(/\s*\Z/m,'')
end
# Convert a text in inputenc to a text in ISO-8859-1
def toISO_8859_1(inputenc)
if inputenc.downcase == 'utf-8'
begin
return self.unpack('U*').pack('C*')
rescue
return self
end
else
return self
end
end
# Convert a text in inputenc to a text in UTF8
# must take care of wrong input locales
def toUTF8(inputenc)
if inputenc.downcase != 'utf-8'
# it is said it is not UTF-8. Ensure it is REALLY not UTF-8
begin
if self.unpack('U*').pack('U*') == self
return self
end
rescue
# do nothing
end
begin
return self.unpack('C*').pack('U*')
rescue
return self #failsafe solution. but a dirty one :-)
end
else
return self
end
end
def needMIME
utf8 = false
self.unpack('U*').each do |c|
if c > 127
utf8 = true
break
end
end
utf8
end
end
|
