Class: BBCode

Inherits:
Object show all
Defined in:
lib/carat/bbcode.rb

Overview

BBCode

This module helps easening the separation of core and frontend with the core (or submodules) being still able to say, what colors shall be used in it’s responses. This is achieved by encoding formatting information using the BBCode tokens. This enables you to “pipe” layout information such as colors, style, fonttype, size and alignment through the core to the frontend.

Additionally it converts markups/codes between ANSI, HTML and BBCode almost freely ;)

Example

# Converting a string to ANSI and XHTML

require 'raspberry/new/bbcode'

str = "this is [COLOR=red]red[/COLOR], this is [B]bold[/B]"
print( BBCode.bbcode_to_ansi(str) )
print( BBCode.bbcode_to_html(str) )

Author

  • Thomas-Ivo Heinen

Copyright (c) 2002 Thomas-Ivo Heinen

History

02-07-16  Bugfix BBCODE=>ANSI, bbcode_to_html, ansi_to_html,
          html_to_bbcode, html_to_ansi

02-11-11  Comment fixes, more case insensitive matching,
          convert deprecated HTML styles (<b>, <i>), more
          space-tolerant matching, img-tags in html_to_bbcode
          works now, some error-preventing stripping and downcasing.

Stamp

$Id: bbcode.rb, v2.2 2002/07/16 transami Exp $

Constant Summary collapse

VERSION = 
2.2
ANSINAME2CODE =

ANSIname => ANSIcode LUT

{ "reset"     => "\e[0m",    "bold"       => "\e[1m",
  "underline" => "\e[4m",    "blink"      => "\e[5m",
  "reverse"   => "\e[7m",    "invisible"  => "\e[8m",
  "black"     => "\e[0;30m", "darkgrey"   => "\e[1;30m",
  "red"       => "\e[0;31m", "lightred"   => "\e[1;31m",
  "green"     => "\e[0;32m", "lightgreen" => "\e[1;32m",
  "brown"     => "\e[0;33m", "yellow"     => "\e[1;33m",
  "blue"      => "\e[0;34m", "lightblue"  => "\e[1;34m",
  "purple"    => "\e[0;35m", "magenta"    => "\e[1;35m",
  "cyan"      => "\e[1;36m", "lightcyan"  => "\e[1;36m",
  "grey"      => "\e[0;37m", "white"      => "\e[1;37m",
  "bgblack"   => "\e[40m",   "bgred"      => "\e[41m",
  "bggreen"   => "\e[42m",   "bgyellow"   => "\e[43m",
  "bgblue"    => "\e[44m",   "bgmagenta"  => "\e[45m",
  "bgcyan"    => "\e[46m",   "bgwhite"    => "\e[47m"
}
BBCOLOR2ANSI =

BBColor => ANSIname LUT

{ "skyblue"   => "blue",     "royalblue" => "blue",
  "blue"      => "blue",     "darkblue"  => "blue",
  "orange"    => "red",      "orangered" => "red",
  "crimson"   => "red",      "red"       => "lightred",
  "firebrick" => "red",      "darkred"   => "red",
  "green"     => "green",    "limegreen" => "green",
  "seagreen"  => "green",    "darkgreen" => "green",
  "deeppink"  => "magenta",  "tomato"    => "red",
  "coral"     => "cyan",     "purple"    => "purple", 
  "indigo"    => "blue",     "burlywood" => "red",
  "sandybrown"=> "red",      "sierra"    => "sierra",
  "chocolate" => "brown",    "teal"      => "teal",
  "silver"    => "white",     
  "black"     => "black",    "yellow"    => "yellow",
  "magenta"   => "magenta",  "cyan"      => "cyan",
  "white"     => "white" 
}
ANSINAME2BBCODE =

ANSInames => BBCode LUT

{ "bold" => "B", "underline" => "U", "reverse" => "I",

  "red"    => "COLOR=red",      "blue"   => "COLOR=blue",
  "green"  => "COLOR=green",    "cyan"   => "COLOR=cyan",
  "magenta"=> "COLOR=deeppink", "purple" => "COLOR=purple",
  "black"  => "COLOR=black",    "white"  => "COLOR=white",
  "yellow" => "COLOR=yellow",   "brown"  => "COLOR=chocolate"
}
@@width =

Needed for alignments

80

Class Method Summary collapse

Class Method Details

.ansi(colorname) ⇒ Object

Returns the ANSI sequence for given color, if existant



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# File 'lib/carat/bbcode.rb', line 107

def BBCode.ansi(colorname)
    colorname.strip!
    return ANSINAME2CODE[ colorname.downcase ]
end

.ansi_to_bbcode(string) ⇒ Object

Returns the string with all ansi escape sequences converted to BBCodes



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# File 'lib/carat/bbcode.rb', line 120

def BBCode.ansi_to_bbcode(string)
    return "" if string.nil? || string.to_s.strip.empty?
    result = ""
    tagstack = []

    ## Iterate over input lines
    string.split("\n").each do |line|
        ansi = line.scan(/\e\[[0-9;]+m/)
        continue if ansi.nil? || ansi.empty?

        ## Iterate over found ansi sequences
        ansi.each do |seq|  
            ansiname = ANSINAME2CODE.invert["#{seq}"]

            ## Pop last tag and form closing tag
            if ansiname == "reset"
                lasttag = tagstack.pop
                bbname = "/" + String.new( lasttag.split("=")[0] )

            ## Get corresponding BBCode tag + Push to stack
            else
                bbname   = ANSINAME2BBCODE[ansiname]
                tagstack.push(bbname) 
            end

            ## Replace ansi sequence by BBCode tag
            replace = sprintf("[%s]", bbname)
            line.sub!("#{Regexp.quote(seq)}", replace)
        end

        ## Append converted line
        result << sprintf("%s\n", line)
    end


    ## Some tags are unclosed
    while !tagstack.empty?
        result << sprintf("[/%s]", String.new(tagstack.pop.split("=")[0])  )
    end

    return result
end

.ansi_to_html(string) ⇒ Object

Converts a ANSI string to one with HTML markup. Returns the string with ANSI code sequences converted to XHTML markup.



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# File 'lib/carat/bbcode.rb', line 338

def BBCode.ansi_to_html(string)
    bbcoded = BBCode.ansi_to_bbcode(string )
    htmled  = BBCode.bbcode_to_html(bbcoded)

    return htmled
end

.bbcode_to_ansi(string, usecolors = true) ⇒ Object

Converts a BBCode string to one with ANSI sequences. Returns the string with all formatting instructions in BBCodes converted to ANSI code sequences / aligned with spaces to specified width.



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# File 'lib/carat/bbcode.rb', line 166

def BBCode.bbcode_to_ansi(string, usecolors = true)
    return "" if string.nil? || string.to_s.strip.empty?
    result = ""

    return BBCode.strip_bbcode(string) if !usecolors

    ## Iterate over lines
    string.split("\n").each do |line|

        ## TODO: stacking? other styles!
        ANSINAME2BBCODE.each do |key,val|
            line.gsub!(/\[#{val}\]/, ANSINAME2CODE[key])
            line.gsub!(/\[\/#{val}\]/, ANSINAME2CODE["reset"])
        end

        ## Fonttypes and sizes not available
        line.gsub!(/\[SIZE=\d\]/, "")
        line.gsub!(/\[\/SIZE\]/, "")
        line.gsub!(/\[FONT=[^\]]*\]/, "")
        line.gsub!(/\[\/FONT\]/, "")

        ## Color-mapping
        colors = line.scan(/\[COLOR=(.*?)\]/i)
        colors = colors.collect{|s|  s[0].to_s} if !colors.nil?
        colors.each do |col|  
            name = BBCOLOR2ANSI[col.downcase]
            name = BBCOLOR2ANSI["white"] if name.nil?
            code = ANSINAME2CODE[name]

            line.gsub!(/\[COLOR=#{col}\]/i, code)
        end
        line.gsub!(/\[\/COLOR\]/, ANSINAME2CODE["reset"])

        ## TODO: Alignment
        ## TODO: IMGs
        ## TODO: EMAILs
        ## TODO: URLs
        ## TODO: QUOTEs
        ## TODO: LISTs

        result << sprintf("%s\n", line)
    end

    return result
end

.bbcode_to_html(string) ⇒ Object

Converts a BBCode string to one with HTML markup. Returns the string with all formatting instructions in BBCodes converted to XHTML markups.



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# File 'lib/carat/bbcode.rb', line 273

def BBCode.bbcode_to_html(string)
    return "" if string.nil? || string.to_s.strip.empty?
    result = ""
    quote = 0

    ## Iterate over lines
    string.split("\n").each do |line|
        styles = { "b" => "strong", "i" => "em", "u" => "u" }

        ## preserve B, I, U
        styles.each do |code,html|
            line.gsub!(/\[#{code}\]/i, "<#{html}>")
            line.gsub!(/\[\/#{code}\]/i, "</#{html}>")
        end
        
        ## COLOR => font color=... (TODO: should be numeric!)
        line.gsub!(/\[COLOR=(.*?)\]/i, "<font color=\"\\1\">")
        line.gsub!(/\[\/COLOR\]/i,     "</font>")

        ## SIZE => font size=...
        line.gsub!(/\[SIZE=(.*?)\]/i, "<font size=\"\\1\">")
        line.gsub!(/\[\/SIZE\]/i,     "</font>")

        ## URL   
        line.gsub!(/\[URL\]([^\[]+?)\[\/URL\]/i, "<a href=\"\\1\">\\1</a>")
        line.gsub!(/\[URL=(.*?)\](.+?)\[\/URL\]/i, "<a href=\"\\1\">\\2</a>")

        ## IMG
        line.gsub!(/\[IMG=(.*?)\]/i, "<img src=\"\\1\" />")

        ## ALIGN=center (TODO: right, left)
        line.gsub!(/\[ALIGN=center\]/i, "<center>")
        line.gsub!(/\[ALIGN=right\]/i,  "<center>")
        line.gsub!(/\[ALIGN=left\]/i,   "<center>")
        line.gsub!(/\[\/ALIGN\]/i,      "</center>")

        ## QUOTE
        quote+=1 if line =~ /\[QUOTE\]/i
        quote-=1 if (line =~ /\[\/QUOTE\]/i) && (quote > -1)
        line.gsub!(/\[QUOTE\]/i,   "<pre>\n")
        line.gsub!(/\[\/QUOTE\]/i, "</pre>\n")
        line.gsub!(/^/, "&#62;"*quote) if quote > 0

        ## EMAIL
        line.gsub!(/\[EMAIL\](.*?)\[\/EMAIL\]/i, "<a href=\"mailto:\\1\">\\1</a>")

        ## LIST (TODO: LIST=1, LIST=A)
        line.gsub!(/\[LIST(?:=(.*?))?\]/i, "\n<ul>\n")
        line.gsub!(/\[\/LIST\]/i,          "\n</ul>\n")
        line.gsub!(/\[\*\]/i,              "\n<li />")

        ## FONT => font ??????
        ## ?BLUR?, FADE?

        result << sprintf("%s<br />\n", line)
    end

    return result
end

.html_to_ansi(string) ⇒ Object

Returns the (X)HTML markup code as ANSI sequences



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# File 'lib/carat/bbcode.rb', line 346

def BBCode.html_to_ansi(string)
    bbcoded = BBCode.html_to_bbcode(string )
    ansied  = BBCode.bbcode_to_ansi(bbcoded)

    return ansied
end

.html_to_bbcode(string) ⇒ Object

Converts a HTML string into one with BBCode markup (TODO) Returns the (X)HTML markup string as BBCode



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# File 'lib/carat/bbcode.rb', line 215

def BBCode.html_to_bbcode(string)
    return "" if string.nil? || string.to_s.strip.empty?
    result = ""

    ## Iterate over lines
    string.split(/<br *\/?>/i).each do |line|
        styles = { "strong" => "b", "b" => "b",
                   "em"     => "i", "i" => "i",
                   "u"      => "u" }

        ## preserve B, I, U
        styles.each do |html,code|
            line.gsub!(/<#{html}>/i, "[#{code.upcase}]")
            line.gsub!(/<\/#{html}>/i, "[/#{code.upcase}]")
        end
        
        ## TODO: COLORs
        ## TODO: SIZEs
        ## TODO: FONTs

        ## EMAIL
        line.gsub!(/<a +href *= *\"mailto:(.*?)\".*?>.*?<\/a>/i, "[EMAIL]\\1[/EMAIL]")
        
        ## URL
        line.gsub!(/<a +href *= *\"((?:https?|ftp):\/\/.*?)\".*?>(.*?)<\/a>/i, "[URL=\\1]\\2[/URL]")
        
        ## Other refs + closing tags => throw away
        line.gsub!(/<a +href *= *\".*?\".*?>/i, "")
        line.gsub!(/<\/a>/i,            "")

        ## IMG
        line.gsub!(/<img +src *= *\"(.*?)\".*?\/?>/i, "[IMG=\\1]")

        ## CENTER (right/left??)
        line.gsub!(/<center>/i,   "[ALIGN=center]")
        line.gsub!(/<\/center>/i, "[/ALIGN]")

        ## QUOTE
        line.gsub!(/<(?:xmp|pre)>/i,   "[QUOTE]")
        line.gsub!(/<\/(?:xmp|pre)>/i, "[/QUOTE]")

        ## LIST
        line.gsub!(/<ul>/i,      "\n[LIST]\n")
        line.gsub!(/<\/ul>/i,    "\n[/LIST]\n")
        line.gsub!(/<li *\/?> */i, "\n[*] ")

        ## Unkown tags => throw away
        line.gsub!(/<.*? *\/?>/, "")

        result << sprintf("%s<br />\n", line)
    end

    return result.gsub!(/<br *\/?>/i, "\n")
end

.strip_bbcode(string) ⇒ Object

— strip_bbcode( string ) Will strip any BBCode tags from the given string.



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# File 'lib/carat/bbcode.rb', line 114

def BBCode.strip_bbcode(string)
    string.strip!
    return string.gsub(/\[[A-Za-z0-9\/=]+\]/, "") 
end