Class: DTextRuby

Inherits:
Object
  • Object
show all
Defined in:
lib/dtext_ruby.rb

Constant Summary collapse

MENTION_REGEXP = 
/(?<=^| )@\S+/

Class Method Summary collapse

Class Method Details

.h(string) ⇒ Object 



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# File 'lib/dtext_ruby.rb', line 11

def self.h(string)
  CGI.escapeHTML(string)
end

.parse(str, options = {}) ⇒ Object 



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# File 'lib/dtext_ruby.rb', line 184

def self.parse(str, options = {})
  return "" if str.nil?

  # Make sure quote tags are surrounded by newlines

  unless options[:inline]
    str.gsub!(/\s*\[quote\](?!\])\s*/m, "\n\n[quote]\n\n")
    str.gsub!(/\s*\[\/quote\]\s*/m, "\n\n[/quote]\n\n")
    str.gsub!(/\s*\[code\](?!\])/m, "\n\n[code]\n\n")
    str.gsub!(/\[\/code\]\s*/m, "\n\n[/code]\n\n")
    str.gsub!(/\s*\[spoilers?\](?!\])\s*/m, "\n\n[spoiler]\n\n")
    str.gsub!(/\s*\[\/spoilers?\]\s*/m, "\n\n[/spoiler]\n\n")
    str.gsub!(/^(h[1-6]\.\s*.+)$/, "\n\n\\1\n\n")
    str.gsub!(/\s*\[expand(\=[^\]]*)?\](?!\])\s*/m, "\n\n[expand\\1]\n\n")
    str.gsub!(/\s*\[\/expand\]\s*/m, "\n\n[/expand]\n\n")
    str.gsub!(/\s*\[table\](?!\])\s*/m, "\n\n[table]\n\n")
    str.gsub!(/\s*\[\/table\]\s*/m, "\n\n[/table]\n\n")
  end

  str.gsub!(/(?:\r?\n){3,}/, "\n\n")
  str.strip!
  blocks = str.split(/(?:\r?\n){2}/)
  stack = []
  flags = {}

  html = blocks.map do |block|
    case block
    when /\A(h[1-6])\.\s*(.+)\Z/
      tag = $1
      content = $2

      if options[:inline]
        "<h6>" + parse_inline(content, options) + "</h6>"
      else
        "<#{tag}>" + parse_inline(content, options) + "</#{tag}>"
      end

    when /^\s*\*+ /
      parse_list(block, options)

    when "[quote]"
      if options[:inline]
        ""
      else
        stack << "blockquote"
        "<blockquote>"
      end

    when "[/quote]"
      if options[:inline]
        ""
      elsif stack.last == "blockquote"
        stack.pop
        '</blockquote>'
      else
        ""
      end

    when "[spoiler]"
      stack << "spoiler"
      '<div class="spoiler">'

    when "[/spoiler]"
      if stack.last == "spoiler"
        stack.pop
        "</div>"
      else
        ""
      end

    when "[table]"
      stack << "table"
      flags[:table] = true
      '<table class="striped">'

    when "[/table]"
      if stack.last == "table"
        stack.pop
        flags[:table] = false
        "</table>"
      else
        ""
      end

    when /\[code\](?!\])/
      flags[:code] = true
      stack << "pre"
      '<pre>'

    when /\[\/code\](?!\])/
      flags[:code] = false
      if stack.last == "pre"
        stack.pop
        "</pre>"
      else
        ""
      end

    when /\[expand(?:\=([^\]]*))?\](?!\])/
      stack << "expandable"
      expand_html = '<div class="expandable"><div class="expandable-header">'
      expand_html << "<span>#{h($1)}</span>" if $1
      expand_html << '<input type="button" value="Show" class="expandable-button"/></div>'
      expand_html << '<div class="expandable-content">'
      expand_html

    when /\[\/expand\](?!\])/
      if stack.last == "expandable"
        stack.pop
        '</div></div>'
      end

    else
      if flags[:code]
        CGI.escape_html(block) + "\n\n"
      elsif flags[:table]
        parse_table_elements(block)
      else
        '<p>' + parse_inline(block) + '</p>'
      end
    end
  end

  stack.reverse.each do |tag|
    if tag == "blockquote"
      html << "</blockquote>"
    elsif tag == "div"
      html << "</div>"
    elsif tag == "pre"
      html << "</pre>"
    elsif tag == "spoiler"
      html << "</div>"
    elsif tag == "expandable"
      html << "</div></div>"
    elsif tag == "table"
      html << "</table>"
    end
  end

  html.join("")
end

.parse_aliased_wiki_links(str) ⇒ Object 



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# File 'lib/dtext_ruby.rb', line 104

def self.parse_aliased_wiki_links(str)
  str.gsub(/\[\[([^\|\]]+)\|([^\]]+)\]\]/m) do
    text = CGI.unescapeHTML($2)
    title = CGI.unescapeHTML($1).tr(" ", "_").downcase
    %{<a href="/wiki_pages/show_or_new?title=#{u(title)}">#{h(text)}</a>}
  end
end

.parse_id_links(str) ⇒ Object 



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# File 'lib/dtext_ruby.rb', line 127

def self.parse_id_links(str)
  str = str.gsub(/\bpost #(\d+)/i, %{<a href="/posts/\\1">post #\\1</a>})
  str = str.gsub(/\bforum #(\d+)/i, %{<a href="/forum_posts/\\1">forum #\\1</a>})
  str = str.gsub(/\btopic #(\d+)(?!\/p\d|\d)/i, %{<a href="/forum_topics/\\1">topic #\\1</a>})
  str = str.gsub(/\btopic #(\d+)\/p(\d+)/i, %{<a href="/forum_topics/\\1?page=\\2">topic #\\1/p\\2</a>})
  str = str.gsub(/\bcomment #(\d+)/i, %{<a href="/comments/\\1">comment #\\1</a>})
  str = str.gsub(/\bpool #(\d+)/i, %{<a href="/pools/\\1">pool #\\1</a>})
  str = str.gsub(/\buser #(\d+)/i, %{<a href="/users/\\1">user #\\1</a>})
  str = str.gsub(/\bartist #(\d+)/i, %{<a href="/artists/\\1">artist #\\1</a>})
  str = str.gsub(/\bissue #(\d+)/i, %{<a href="https://github.com/r888888888/danbooru/issues/\\1">issue #\\1</a>})
  str = str.gsub(/\bpixiv #(\d+)(?!\/p\d|\d)/i, %{<a href="http://www.pixiv.net/member_illust.php?mode=medium&illust_id=\\1">pixiv #\\1</a>})
  str = str.gsub(/\bpixiv #(\d+)\/p(\d+)/i, %{<a href="http://www.pixiv.net/member_illust.php?mode=manga_big&illust_id=\\1&page=\\2">pixiv #\\1/p\\2</a>})
end

.parse_inline(str, options = {}) ⇒ Object 



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# File 'lib/dtext_ruby.rb', line 37

def self.parse_inline(str, options = {})
  str.gsub!(/&/, "&amp;")
  str.gsub!(/</, "&lt;")
  str.gsub!(/>/, "&gt;")
  str.gsub!(/\n/m, "<br>") unless options[:ignore_newlines]
  str.gsub!(/\[b\](.+?)\[\/b\]/i, '<strong>\1</strong>')
  str.gsub!(/\[i\](.+?)\[\/i\]/i, '<em>\1</em>')
  str.gsub!(/\[s\](.+?)\[\/s\]/i, '<s>\1</s>')
  str.gsub!(/\[u\](.+?)\[\/u\]/i, '<u>\1</u>')
  str.gsub!(/\[tn\](.+?)\[\/tn\]/i, '<p class="tn">\1</p>')

  str = parse_mentions(str)
  str = parse_links(str)
  str = parse_aliased_wiki_links(str)
  str = parse_wiki_links(str)
  str = parse_post_links(str)
  str = parse_id_links(str)
  str
end

.parse_links(str) ⇒ Object 



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# File 'lib/dtext_ruby.rb', line 79

def self.parse_links(str)
  str.gsub(/("[^"]+":(https?:\/\/|\/)[^\s\r\n<>]+|https?:\/\/[^\s\r\n<>]+|"[^"]+":\[(https?:\/\/|\/)[^\s\r\n<>\]]+\])+/) do |url|
    ch = ""

    if url =~ /^"([^"]+)":\[(.+)\]$/
      text = $1
      url = $2
    else
      if url =~ /^"([^"]+)":(.+)$/
        text = $1
        url = $2
      else
        text = url
      end

      if url =~ /([;,.!?\)\]<>])$/
        url.chop!
        ch = $1
      end
    end

    '<a href="' + url + '">' + text + '</a>' + ch
  end
end

.parse_list(str, options = {}) ⇒ Object 



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# File 'lib/dtext_ruby.rb', line 141

def self.parse_list(str, options = {})
  html = ""
  current_item = ""
  layout = []
  nest = 0

  str.split(/\n/).each do |line|
    if line =~ /^\s*(\*+) (.+)/
      if nest > 0
        html += "<li>#{current_item}</li>"
      elsif not current_item.strip.empty?
        html += "<p>#{current_item}</p>"
      end

      nest = $1.size
      current_item = parse_inline($2)
    else
      current_item += parse_inline(line)
    end

    if nest > layout.size
      html += "<ul>"
      layout << "ul"
    end

    while nest < layout.size
      elist = layout.pop
      if elist
        html += "</#{elist}>"
      end
    end
  end

  html += "<li>#{current_item}</li>"

  while layout.any?
    elist = layout.pop
    html += "</#{elist}>"
  end

  html
end

.parse_mentions(str) ⇒ Object 



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# File 'lib/dtext_ruby.rb', line 57

def self.parse_mentions(str)
  str.gsub!(MENTION_REGEXP) do |name| 
    next name unless name =~ /[a-z0-9]/i

    if name =~ /([:;,.!?\)\]<>])$/
      name.chop!
      ch = $1
    else
      ch = ""
    end

    '<a href="/users?name=' + u(CGI.unescapeHTML(name[1..-1])) + '">' + name + '</a>' + ch
  end
  str
end

.parse_post_links(str) ⇒ Object 



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# File 'lib/dtext_ruby.rb', line 120

def self.parse_post_links(str)
  str.gsub(/\{\{([^\}]+)\}\}/) do
    tags = CGI.unescapeHTML($1)
    %{<a rel="nofollow" href="/posts?tags=#{u(tags)}">#{h(tags)}</a>}
  end
end

.parse_table_elements(str) ⇒ Object 



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# File 'lib/dtext_ruby.rb', line 73

def self.parse_table_elements(str)
  str = parse_inline(str, :ignore_newlines => true)
  str.gsub!(/\[(\/?(?:tr|td|th|thead|tbody))\]/, '<\1>')
  str
end

.parse_wiki_links(str) ⇒ Object 



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# File 'lib/dtext_ruby.rb', line 112

def self.parse_wiki_links(str)
  str.gsub(/\[\[([^\]]+)\]\]/) do
    text = CGI.unescapeHTML($1)
    title = text.tr(" ", "_").downcase
    %{<a href="/wiki_pages/show_or_new?title=#{u(title)}">#{h(text)}</a>}
  end
end

.strip_blocks(string, tag) ⇒ Object 



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# File 'lib/dtext_ruby.rb', line 15

def self.strip_blocks(string, tag)
  blocks = string.scan(/\[\/?#{tag}\]|.+?(?=\[\/?#{tag}\]|$)/m)
  n = 0
  stripped = ""
  blocks.each do |block|
    case block
    when "[#{tag}]"
      n += 1

    when "[/#{tag}]"
      n -= 1

    else
      if n == 0
        stripped += block
      end
    end
  end

  stripped.strip
end

.u(string) ⇒ Object 



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# File 'lib/dtext_ruby.rb', line 7

def self.u(string)
  CGI.escape(string)
end