# -*- coding: utf-8 -*-
#
#--
# Copyright (C) 2009-2012 Thomas Leitner <t_leitner@gmx.at>
#
# This file is part of kramdown.
#
# kramdown 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 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 General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.
#++
#

require 'kramdown/parser/kramdown/blank_line'
require 'kramdown/parser/kramdown/extensions'
require 'kramdown/parser/kramdown/eob'
require 'kramdown/parser/kramdown/paragraph'

module Kramdown
  module Parser
    class Kramdown

      CODEBLOCK_START = INDENT
      CODEBLOCK_MATCH = /(?:#{BLANK_LINE}?(?:#{INDENT}[ \t]*\S.*\n)+(?:(?!#{BLANK_LINE} {0,3}\S|#{IAL_BLOCK_START}|#{EOB_MARKER}|^#{OPT_SPACE}#{LAZY_END_HTML_STOP}|^#{OPT_SPACE}#{LAZY_END_HTML_START})^[ \t]*\S.*\n)*)*/

      # Parse the indented codeblock at the current location.
      def parse_codeblock
        data = @src.scan(self.class::CODEBLOCK_MATCH)
        data.gsub!(/\n( {0,3}\S)/, ' \\1')
        data.gsub!(INDENT, '')
        @tree.children << new_block_el(:codeblock, data)
        true
      end
      define_parser(:codeblock, CODEBLOCK_START)


      FENCED_CODEBLOCK_START = /^~{3,}/
      FENCED_CODEBLOCK_MATCH = /^(~{3,})\s*?(\w+)?\s*?\n(.*?)^\1~*\s*?\n/m

      # Parse the fenced codeblock at the current location.
      def parse_codeblock_fenced
        if @src.check(FENCED_CODEBLOCK_MATCH)
          @src.pos += @src.matched_size
          el = new_block_el(:codeblock, @src[3])
          lang = @src[2].to_s.strip
          el.attr['class'] = "language-#{lang}" unless lang.empty?
          @tree.children << el
          true
        else
          false
        end
      end
      define_parser(:codeblock_fenced, FENCED_CODEBLOCK_START)

    end
  end
end