Class: MotionMarkdownItPlugins::Mark

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

Class Method Summary collapse

Class Method Details

.init_plugin(md) ⇒ Object 



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# File 'lib/motion-markdown-it-plugins/mark/mark.rb', line 9

def self.init_plugin(md)
  md.inline.ruler.before('emphasis', 'mark', lambda { |state, silent| Mark.tokenize(state, silent) })
  md.inline.ruler2.before('emphasis', 'mark', lambda { |state| Mark.postProcess(state) })
end

.postProcess(state) ⇒ Object

Walk through delimiter list and replace text tokens with tags



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# File 'lib/motion-markdown-it-plugins/mark/mark.rb', line 62

def self.postProcess(state)
  loneMarkers = []
  delimiters  = state.delimiters
  max         = state.delimiters.length

  i = 0
  while i < max
    startDelim = delimiters[i]

    (i += 1) and next if startDelim[:marker] != 0x3D # =

    (i += 1) and next if startDelim[:end] == -1

    endDelim = delimiters[startDelim[:end]]

    token         = state.tokens[startDelim[:token]]
    token.type    = 'mark_open'
    token.tag     = 'mark'
    token.nesting = 1
    token.markup  = '=='
    token.content = ''

    token         = state.tokens[endDelim[:token]]
    token.type    = 'mark_close'
    token.tag     = 'mark'
    token.nesting = -1
    token.markup  = '=='
    token.content = ''

    if (state.tokens[endDelim[:token] - 1].type == 'text' &&
        state.tokens[endDelim[:token] - 1].content == '=')
      loneMarkers.push(endDelim[:token] - 1)
    end

    i += 1
  end

  # If a marker sequence has an odd number of characters, it's splitted
  # like this: `~~~~~` -> `~` + `~~` + `~~`, leaving one marker at the
  # start of the sequence.
  #
  # So, we have to move all those markers after subsequent s_close tags.
  #
  while loneMarkers.length > 0
    i = loneMarkers.pop
    j = i + 1

    while j < state.tokens.length && state.tokens[j].type === 'mark_close'
      j += 1
    end

    j -= 1

    if i != j
      token = state.tokens[j]
      state.tokens[j] = state.tokens[i]
      state.tokens[i] = token
    end
  end
end

.tokenize(state, silent) ⇒ Object

Insert each marker as a separate text token, and add it to delimiter list



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# File 'lib/motion-markdown-it-plugins/mark/mark.rb', line 16

def self.tokenize(state, silent)
  start  = state.pos
  marker = state.src.charCodeAt(start)

  return false if silent

  return false if marker != 0x3D # =

  scanned = state.scanDelims(state.pos, true)
  len = scanned[:length]
  ch  = fromCharCode(marker)

  return false if len < 2

  if len % 2 > 0
    token         = state.push('text', '', 0)
    token.content = ch
    len -= 1
  end

  i = 0
  while i < len
    token         = state.push('text', '', 0)
    token.content = ch + ch

    state.delimiters.push({
      marker: marker,
      length: scanned[:length],
      jump:   i,
      token:  state.tokens.length - 1,
      level:  state.level,
      end:    -1,
      open:   scanned[:can_open],
      close:  scanned[:can_close]
    })

    i += 2
  end

  state.pos += scanned[:length]

  return true
end