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# encoding: utf-8
#--
# Copyright (C) 2009 Johan Sørensen
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as published by
# the Free Software Foundation, either version 3 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 Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#++
require "zlib"
class MarkupRenderer
class NotProcessedYetError < StandardError; end
WRAPPER_NAME = "markdown-wrapper".freeze
PRE_TAG_EXTRATION_KEY = "gts-markup-renderer".freeze
def initialize(content, options = {})
@content = content.to_s
@options = options
@options[:markdown] ||= [:smart]
@markdown = nil
end
def markdown
raise NotProcessedYetError unless @markdown
@markdown
end
def to_html
pre_process
@markdown = RDiscount.new(@content, *@options[:markdown])
post_process(@markdown.to_html)
end
def pre_process
# Extract <pre> tags
pre_tag_content = {}
@content.gsub!(/(<pre>.*?<\/pre>)/im) do |pre|
crc = Zlib.crc32(pre)
pre_tag_content[crc] = pre
"$#{PRE_TAG_EXTRATION_KEY}-#{crc}$"
end
# Convert windows lineendings
@content.gsub!(/\r\n?/, "\n")
# Convert any single newlines to space-space-newline
# so markdown will break them
@content.gsub!(/([^\n]\n)(?=[^\n])/) do |m|
m.gsub!(/^(.+)$/, '\1 ')
end
# re-insert the extracted <pre> tag content
@content.gsub!(/\$#{PRE_TAG_EXTRATION_KEY}-(\d+)\$/) do
pre_tag_content[$1.to_i]
end
@content
end
def post_process(text)
if @options[:wrapper].blank?
text
else
if @options[:wrapper] == true
"<div class=\"#{WRAPPER_NAME}\">\n#{text}</div>\n"
else
"<div class=\"#{@options[:wrapper]} #{WRAPPER_NAME}\">\n#{text}</div>\n"
end
end
end
end
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