SoundSoftware Code Site

# Redmine - project management software

# Copyright (C) 2006-2011  Jean-Philippe Lang

#

# 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., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.

require 'redcloth3'

require 'digest/md5'

module Redmine

  module WikiFormatting

    module Textile

      class Formatter < RedCloth3

        include ActionView::Helpers::TagHelper

        # auto_link rule after textile rules so that it doesn't break !image_url! tags

        RULES = [:textile, :block_markdown_rule, :inline_auto_link, :inline_auto_mailto]

        def initialize(*args)

          super

          self.hard_breaks=true

          self.no_span_caps=true

          self.filter_styles=true

        end

        def to_html(*rules)

          @toc = []

          super(*RULES).to_s

        end

        def get_section(index)

          section = extract_sections(index)[1]

          hash = Digest::MD5.hexdigest(section)

          return section, hash

        end

        def update_section(index, update, hash=nil)

          t = extract_sections(index)

          if hash.present? && hash != Digest::MD5.hexdigest(t[1])

            raise Redmine::WikiFormatting::StaleSectionError

          end

          t[1] = update unless t[1].blank?

          t.reject(&:blank?).join "\n\n"

        end

        def extract_sections(index)

          @pre_list = []

          text = self.dup

          rip_offtags text, false, false

          before = ''

          s = ''

          after = ''

          i = 0

          l = 1

          started = false

          ended = false

          text.scan(/(((?:.*?)(\A|\r?\n\r?\n))(h(\d+)(#{A}#{C})\.(?::(\S+))? (.*?)$)|.*)/m).each do |all, content, lf, heading, level|

            if heading.nil?

              if ended

                after << all

              elsif started

                s << all

              else

                before << all

              end

              break

            end

            i += 1

            if ended

              after << all

            elsif i == index

              l = level.to_i

              before << content

              s << heading

              started = true

            elsif i > index

              s << content

              if level.to_i > l

                s << heading

              else

                after << heading

                ended = true

              end

            else

              before << all

            end

          end

          sections = [before.strip, s.strip, after.strip]

          sections.each {|section| smooth_offtags_without_code_highlighting section}

          sections

        end

      private

        # Patch for RedCloth.  Fixed in RedCloth r128 but _why hasn't released it yet.

        # <a href="http://code.whytheluckystiff.net/redcloth/changeset/128">http://code.whytheluckystiff.net/redcloth/changeset/128</a>

        def hard_break( text )

          text.gsub!( /(.)\n(?!\n|\Z| *([#*=]+(\s|$)|[{|]))/, "\\1<br />" ) if hard_breaks

        end

        alias :smooth_offtags_without_code_highlighting :smooth_offtags

        # Patch to add code highlighting support to RedCloth

        def smooth_offtags( text )

          unless @pre_list.empty?

            ## replace <pre> content

            text.gsub!(/<redpre#(\d+)>/) do

              content = @pre_list[$1.to_i]

              if content.match(/<code\s+class="(\w+)">\s?(.+)/m)

                content = "<code class=\"#{$1} syntaxhl\">" +

                  Redmine::SyntaxHighlighting.highlight_by_language($2, $1)

              end

              content

            end

          end

        end

        AUTO_LINK_RE = %r{

                        (                          # leading text

                          <\w+.*?>|                # leading HTML tag, or

                          [^=<>!:'"/]|             # leading punctuation, or

                          ^                        # beginning of line

                        )

                        (

                          (?:https?://)|           # protocol spec, or

                          (?:s?ftps?://)|

                          (?:www\.)                # www.*

                        )

                        (

                          (\S+?)                   # url

                          (\/)?                    # slash

                        )

                        ((?:>)?|[^\w\=\/;\(\)]*?)               # post

                        (?=<|\s|$)

                       }x unless const_defined?(:AUTO_LINK_RE)

        # Turns all urls into clickable links (code from Rails).

        def inline_auto_link(text)

          text.gsub!(AUTO_LINK_RE) do

            all, leading, proto, url, post = $&, $1, $2, $3, $6

            if leading =~ /<a\s/i || leading =~ /![<>=]?/

              # don't replace URL's that are already linked

              # and URL's prefixed with ! !> !< != (textile images)

              all

            else

              # Idea below : an URL with unbalanced parethesis and

              # ending by ')' is put into external parenthesis

              if ( url[-1]==?) and ((url.count("(") - url.count(")")) < 0 ) )

                url=url[0..-2] # discard closing parenth from url

                post = ")"+post # add closing parenth to post

              end

              tag = content_tag('a', proto + url, :href => "#{proto=="www."?"http://www.":proto}#{url}", :class => 'external')

              %(#{leading}#{tag}#{post})

            end

          end

        end

        # Turns all email addresses into clickable links (code from Rails).

        def inline_auto_mailto(text)

          text.gsub!(/([\w\.!#\$%\-+.]+@[A-Za-z0-9\-]+(\.[A-Za-z0-9\-]+)+)/) do

            mail = $1

            if text.match(/<a\b[^>]*>(.*)(#{Regexp.escape(mail)})(.*)<\/a>/)

              mail

            else

              content_tag('a', mail, :href => "mailto:#{mail}", :class => "email")

            end

          end

        end

      end

    end

  end

end