Module: MdToBbcode

Defined in:
lib/md_to_bbcode.rb,
lib/md_to_bbcode/version.rb,
lib/md_to_bbcode/core_extensions/string/md_to_bbcode.rb

Defined Under Namespace

Modules: CoreExtensions

Constant Summary collapse

VERSION = 
'1.1.2'

Class Method Summary collapse

Class Method Details

.md_to_bbcode(markdown) ⇒ Object

Convert a Markdown string to Bbcode

Parameters

  • markdown (String): The Markdown string

Result

  • String: BBCode converted string



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

def self.md_to_bbcode(markdown)
  bbcode_lines = []
  in_a_list = false
  in_a_code_block = false
  in_bold_text = false
  in_italic_text = false
  markdown.split("\n").each do |line|
    unindented_line = in_a_list && line =~ /^  (.*)$/ ? $1 : line
    if unindented_line =~ /^```(.*)$/
      if in_a_code_block
        # We exit a code block
        bbcode_lines << "#{in_a_list ? '  ' : ''}[/code]\n"
        in_a_code_block = false
      else
        # We enter a code block
        bbcode_lines << "#{in_a_list ? '  ' : ''}[code]"
        in_a_code_block = true
      end
    elsif in_a_code_block
      # Don't change anything at the formatting
      bbcode_lines << "#{line}\n"
    else
      # Handle in-line code markers first
      line = line.split(/(`.+?`)/).map do |field|
        if field[0] == '`'
          # Don't change anything at the formatting
          "#{in_bold_text ? '' : '[b]'}[font=Courier New]#{field[1..-2]}[/font]#{in_bold_text ? '' : '[/b]'}"
        else
          # Apply the formatting except the formatting used for whole lines (headers, bullets, lists...)
          # Images (do this gsub before links and any single tags, like bold, headings...)
          field.gsub!(/!\[(.*?)\]\((.*?)\)/, '[img]\2[/img]')
          # Links
          field.gsub!(/\[(.*?)\]\((.*?)\)/, '[url=\2]\1[/url]')
          # Bold (do this before italic)
          if in_bold_text
            field.gsub!(/\*\*(.*?)\*\*/, '[/b]\1[b]')
          else
            field.gsub!(/\*\*(.*?)\*\*/, '[b]\1[/b]')
          end
          if field =~ /.*\*\*.*/
            if in_bold_text
              field.gsub!(/(.*)\*\*(.*)/, '\1[/b]\2')
              in_bold_text = false
            else
              field.gsub!(/(.*)\*\*(.*)/, '\1[b]\2')
              in_bold_text = true
            end
          end
          # Italic
          if in_italic_text
            field.gsub!(/\*(\S.*?)\*/, '[/i]\1[i]')
          else
            field.gsub!(/\*(\S.*?)\*/, '[i]\1[/i]')
          end
          if in_italic_text && field =~ /.*\S\*.*/
            field.gsub!(/(.*\S)\*(.*)/, '\1[/i]\2')
            in_italic_text = false
          elsif !in_italic_text && field =~ /.*\*\S.*/
            field.gsub!(/(.*)\*(\S.*)/, '\1[i]\2')
            in_italic_text = true
          end
          field
        end
      end.join
      # Heading 1
      line.gsub!(/^# (.*?)$/, '[size=6][b]\1[/b][/size]')
      # Heading 2
      line.gsub!(/^## (.*?)$/, '[size=6]\1[/size]')
      # Heading 3
      line.gsub!(/^### (.*?)$/, '[size=5][b]\1[/b][/size]')
      # Heading 4
      line.gsub!(/^#### (.*?)$/, '[size=5]\1[/size]')
      # Bullets
      if line =~ /^\* (.+)$/
        # Single bullet line
        bbcode_lines << "[list]\n" unless in_a_list
        bbcode_lines << "[*]#{$1}\n"
        in_a_list = true
      elsif line =~ /^\d\. (.+)$/
        # Single numbered line
        bbcode_lines << "[list=1]\n" unless in_a_list
        bbcode_lines << "[*]#{$1}\n"
        in_a_list = true
      else
        if in_a_list && !(line =~ /^  (.*)$/)
          bbcode_lines << "[/list]\n"
          in_a_list = false
        end
        bbcode_lines << "#{line}\n"
      end
    end
  end
  bbcode_lines << "[/list]\n" if in_a_list
  bbcode = bbcode_lines.join
  markdown.end_with?("\n") ? bbcode : bbcode[0..-2]
end