moebooru/lib/dtext.rb

require 'cgi'
require 'nokogiri'

module DText
  def parse(str)
    state = ['newline']
    result = ""

    # Normalize newlines
    str.strip
    str.gsub!(/(\r?\n)/, "\n")
    str.gsub!(/\n{3,}/, "\n\n")
    str = CGI.escapeHTML str

    # Keep newline, use carriage return for split
    str.gsub!(/(\n+)/, '\1' + "\r")
    data = str.split("\r")

    data.each do |d|
      result << parseline(d, state)
    end
    result = parseinline(result)

    Nokogiri::HTML::DocumentFragment.parse(result).to_html
  end

  def parseinline(str)
    str.gsub!(/\[\[(.+?)\|(.+?)\]\]/) do
      "<a href=\"/wiki/show?title=#{CGI.escape(CGI.unescapeHTML($1.tr(" ", "_")))}\">#{$2}</a>"
    end
    str.gsub!(/\[\[(.+?)\]\]/) do
      "<a href=\"/wiki/show?title=#{CGI.escape(CGI.unescapeHTML($1.tr(" ", "_")))}\">#{$1}</a>"
    end
    str.gsub!(/\{\{(.+?)\}\}/) do
      "<a href=\"/post/index?tags=#{CGI.escape(CGI.unescapeHTML($1))}\">#{$1}</a>"
    end
    str.gsub! /\[b\](.+)\[\/b\]/, '<strong>\1</strong>'
    str.gsub! /\[i\](.+)\[\/i\]/, '<em>\1</em>'
    str.gsub! /(post #(\d+))/i, '<a href="/post/show/\2">\1</a>'
    str.gsub! /(forum #(\d+))/i, '<a href="/forum/show/\2">\1</a>'
    str.gsub! /(comment #(\d+))/i, '<a href="/comment/show/\2">\1</a>'
    str.gsub! /(pool #(\d+))/i, '<a href="/pool/show/\2">\1</a>'
    str.gsub! /\[spoilers?\]/, '<span href="#" class="spoiler" onclick="Comment.spoiler(this); return false;"><span class="spoilerwarning">spoiler</span></span><span class="spoilertext" style="display: none">'
    str.gsub! /\[spoilers?=(.+?)\]/, '<span href="#" class="spoiler" onclick="Comment.spoiler(this); return false;"><span class="spoilerwarning">\1</span></span><span class="spoilertext" style="display: none">'
    str.gsub! /\[\/spoilers?\]/, '</span>'
    str.gsub! /\[quote\]/, '<blockquote><div>'
    str.gsub! /\[\/quote\]/, '</div></blockquote>'
    str = parseurl(str)
    str.gsub! /\n/, '<br>'
    str
  end

  def parseline(str, state)
    if state.last =~ /\d/ or str =~ /^\*+\s+/
      parselist str, state
    elsif str =~ /^(h[1-6])\.\s*(.+)\n*/
      str = "<#{$1}>#{$2}</#{$1}>"
    else
      str
    end
  end

  def parselist(str, state)
    html = ""
    if not state.last =~ /\d/
      state.push "1"
      html << "<ul>"
    else
      n = str.split()[0].count("*")
      if n < state.last.to_i
        html << '</ul>' * (state.last.to_i - n)
        state[-1] = n.to_s
      elsif n > state.last.to_i
        html << '<ul>'
        state[-1] = (state.last.to_i + 1).to_s
      end
    end
    if not str =~ /^\*+\s+/
      state.pop
      html << "</ul>"
      return html + parseline(str, state)
    end
    html << str.gsub(/\*+\s+(.+)\n*/) do 
      "<li>#{$1}</li>"
    end
  end

  def parseurl(str)
    url = /(h?ttps?:\/\/\[?(:{0,2}[\w\-]+)((:{1,2}|\.)[\w\-]+)*\]?(:\d+)*(\/[^\s\n]*)*)/
    str = str.gsub(/&lt;&lt;\s*([^\s]+?)\s*\|\s*(.+?)\s*&gt;&gt;/) do
      link = $1
      name = $2
      if link =~ url
        "<a href=\"#{link}\">#{name}</a>"
      end
    end
    str = str.gsub(/(^|\s+)&quot;(.+?)&quot;:#{url}/, '\1<a href="\3">\2</a>')
       .gsub(/&lt;&lt;\s*#{url}\s*&gt;&gt;/, '<a href="\1">\1</a>')
       .gsub(/(^|[\s\(]+)#{url}/, '\1<a href="\2">\2</a>')
       .gsub(/<a href="ttp/, '<a href="http')
  end

  module_function :parse, :parseline, :parseinline, :parselist, :parseurl
end