Class: MotionMarkdownItPlugins::Sub

Inherits:
Object
  • Object
show all
Extended by:
MarkdownIt::Common::Utils
Defined in:
lib/motion-markdown-it-plugins/sub/sub.rb

Constant Summary collapse

UNESCAPE_RE =

same as UNESCAPE_MD_RE plus a space

/\\([ \!\"\#\$\%\&\'\(\)\*\+\,\-.\/:;<=>?@\[\\\]^_`{|}~])/

Class Method Summary collapse

Class Method Details

.init_plugin(md) ⇒ Object 



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# File 'lib/motion-markdown-it-plugins/sub/sub.rb', line 14

def self.init_plugin(md)
  md.inline.ruler.after('emphasis', 'sub', lambda { |state, silent| Sub.subscript(state, silent) })
end

.subscript(state, silent) ⇒ Object 



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# File 'lib/motion-markdown-it-plugins/sub/sub.rb', line 19

def self.subscript(state, silent)
  max   = state.posMax
  start = state.pos

  return false if (state.src.charCodeAt(start) != 0x7E)  # '~'
  return false if (silent) # don't run any pairs in validation mode
  return false if (start + 2 >= max)

  state.pos = start + 1

  while (state.pos < max)
    if (state.src.charCodeAt(state.pos) == 0x7E)  # '~'
      found = true
      break
    end

    state.md.inline.skipToken(state)
  end

  if (!found || start + 1 == state.pos)
    state.pos = start
    return false
  end

  content = state.src.slice((start + 1)...state.pos)

  # don't allow unescaped spaces/newlines inside
  if (content.match(/(^|[^\\])(\\\\)*\s/))
    state.pos = start
    return false
  end

  # found!
  state.posMax = state.pos
  state.pos    = start + 1

  # Earlier we checked !silent, but this implementation does not need it
  token         = state.push('sub_open', 'sub', 1)
  token.markup  = '~'

  token         = state.push('text', '', 0)
  token.content = content.gsub(UNESCAPE_RE, '\1')

  token         = state.push('sub_close', 'sub', -1)
  token.markup  = '~'

  state.pos    = state.posMax + 1
  state.posMax = max
  return true
end