Class: MarkdownToMrkdwn::Converter

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

Constant Summary collapse

SENTINEL = 
"§"

Instance Method Summary collapse

Constructor Details

#initialize(heading: :bold, keep_hr: false) ⇒ Converter

Options:

  • heading: :bold (default) or :plain

  • keep_hr: true to keep — as is (default false -> replace with an em dash line)



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# File 'lib/markdown_to_mrkdwn/converter.rb', line 9

def initialize(heading: :bold, keep_hr: false)
  @heading_style = heading
  @keep_hr = keep_hr
end

Instance Method Details

#convert(markdown) ⇒ Object 



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# File 'lib/markdown_to_mrkdwn/converter.rb', line 14

def convert(markdown)
  return "" if markdown.nil? || markdown.empty?

  text = markdown.dup

  # 1) Extract fenced code blocks and inline code to protect from further processing
  blocks = {}
  text = extract_fenced_code_blocks(text, blocks)
  text = extract_inline_code(text, blocks)

  # 2) Images: ![alt](url) -> <url|alt>
  text.gsub!(/!\[(.*?)\]\((\S+?)(?:\s+".*?")?\)/) do
    alt = Regexp.last_match(1)
    url = Regexp.last_match(2)
    "<#{url}|#{alt}>"
  end

  # 3) Links: [text](url) -> <url|text>
  text.gsub!(/\[(.*?)\]\((\S+?)(?:\s+".*?")?\)/) do
    label = Regexp.last_match(1)
    url = Regexp.last_match(2)
    "<#{url}|#{label}>"
  end

  # 4) Strikethrough: ~~text~~ -> ~text~
  text.gsub!(/~~(.*?)~~/, '~\1~')

  # 5) Italic: *text* or _text_ -> _text_
  # Run italics BEFORE bold so that bold remains asterisks in Slack.
  # Only match single markers, not double.
  text.gsub!(/(?<!\*)\*(?!\*)(.+?)(?<!\*)\*(?!\*)/, '_\1_')
  text.gsub!(/(?<!_)_(?!_)(.+?)(?<!_)_(?!_)/, '_\1_')

  # 6) Bold: **text** or __text__ -> *text*
  text.gsub!(/\*\*(.+?)\*\*/, '*\1*')
  text.gsub!(/__(.+?)__/, '*\1*')

  # 7) Headings: # H -> *H*
  text = convert_headings(text)

  # 8) Horizontal rules
  text.gsub!(/^\s*([-*_])\s*\1\s*\1\s*$/, @keep_hr ? '\0' : "—\n")

  # 9) Restore protected code segments
  restore_placeholders(text, blocks)
end