4 # :title: Standard classes extensions
6 # Author:: Giuseppe "Oblomov" Bilotta <giuseppe.bilotta@gmail.com>
7 # Copyright:: (C) 2006,2007 Giuseppe Bilotta
10 # This file collects extensions to standard Ruby classes and to some core rbot
11 # classes to be used by the various plugins
13 # Please note that global symbols have to be prefixed by :: because this plugin
14 # will be read into an anonymous module
17 # Extensions to the Array class
21 # This method returns a random element from the array, or nil if the array is
25 return nil if self.empty?
26 self[rand(self.length)]
31 # Extensions to the String class
33 # TODO make ircify_html() accept an Hash of options, and make riphtml() just
34 # call ircify_html() with stronger purify options.
38 # This method will return a purified version of the receiver, with all HTML
39 # stripped off and some of it converted to IRC formatting
44 # bold and strong -> bold
45 txt.gsub!(/<\/?(?:b|strong)\s*>/, "#{Bold}")
47 # italic, emphasis and underline -> underline
48 txt.gsub!(/<\/?(?:i|em|u)\s*>/, "#{Underline}")
50 ## This would be a nice addition, but the results are horrible
51 ## Maybe make it configurable?
52 # txt.gsub!(/<\/?a( [^>]*)?>/, "#{Reverse}")
54 # Paragraph and br tags are converted to whitespace
55 txt.gsub!(/<\/?(p|br)\s*\/?\s*>/, ' ')
59 # All other tags are just removed
60 txt.gsub!(/<[^>]+>/, '')
62 # Convert HTML entities. We do it now to be able to handle stuff
64 txt = Utils.decode_html_entities(txt)
66 # Remove double formatting options, since they only waste bytes
67 txt.gsub!(/#{Bold}(\s*)#{Bold}/, '\1')
68 txt.gsub!(/#{Underline}(\s*)#{Underline}/, '\1')
70 # Simplify whitespace that appears on both sides of a formatting option
71 txt.gsub!(/\s+(#{Bold}|#{Underline})\s+/, ' \1')
72 txt.sub!(/\s+(#{Bold}|#{Underline})\z/, '\1')
73 txt.sub!(/\A(#{Bold}|#{Underline})\s+/, '\1')
75 # And finally whitespace is squeezed
78 # Decode entities and strip whitespace
82 # This method will strip all HTML crud from the receiver
85 self.gsub(/<[^>]+>/, '').gsub(/&/,'&').gsub(/"/,'"').gsub(/</,'<').gsub(/>/,'>').gsub(/&ellip;/,'...').gsub(/'/, "'").gsub("\n",'')
90 # Extensions to the Regexp class, with some common and/or complex regular
95 # A method to build a regexp that matches a list of something separated by
96 # optional commas and/or the word "and", an optionally repeated prefix,
98 def Regexp.new_list(reg, pfx = "")
99 if pfx.kind_of?(String) and pfx.empty?
100 return %r(#{reg}(?:,?(?:\s+and)?\s+#{reg})*)
102 return %r(#{reg}(?:,?(?:\s+and)?(?:\s+#{pfx})?\s+#{reg})*)
109 # Match a list of channel anmes separated by optional commas, whitespace
110 # and optionally the word "and"
111 CHAN_LIST = Regexp.new_list(GEN_CHAN)
113 # Match "in #channel" or "on #channel" and/or "in private" (optionally
114 # shortened to "in pvt"), returning the channel name or the word 'private'
115 # or 'pvt' as capture
116 IN_CHAN = /#{IN_ON}\s+(#{GEN_CHAN})|(here)|/
117 IN_CHAN_PVT = /#{IN_CHAN}|in\s+(private|pvt)/
119 # As above, but with channel lists
120 IN_CHAN_LIST_SFX = Regexp.new_list(/#{GEN_CHAN}|here/, IN_ON)
121 IN_CHAN_LIST = /#{IN_ON}\s+#{IN_CHAN_LIST_SFX}|anywhere|everywhere/
122 IN_CHAN_LIST_PVT_SFX = Regexp.new_list(/#{GEN_CHAN}|here|private|pvt/, IN_ON)
123 IN_CHAN_LIST_PVT = /#{IN_ON}\s+#{IN_CHAN_LIST_PVT_SFX}|anywhere|everywhere/
125 # Match a list of nicknames separated by optional commas, whitespace and
126 # optionally the word "and"
127 NICK_LIST = Regexp.new_list(GEN_NICK)
137 class BasicUserMessage
139 # We extend the BasicUserMessage class with a method that parses a string
140 # which is a channel list as matched by IN_CHAN(_LIST) and co. The method
141 # returns an array of channel names, where 'private' or 'pvt' is replaced
142 # by the Symbol :"?", 'here' is replaced by the channel of the message or
143 # by :"?" (depending on whether the message target is the bot or a
144 # Channel), and 'anywhere' and 'everywhere' are replaced by Symbol :*
146 def parse_channel_list(string)
147 return [:*] if [:anywhere, :everywhere].include? string.to_sym
149 /(?:^|,?(?:\s+and)?\s+)(?:in|on\s+)?(#{Regexp::Irc::GEN_CHAN}|here|private|pvt)/