Class: MarkdownIt::RulesInline::Strikethrough

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

Constant Summary

Constants included from Common::Utils

Common::Utils::DIGITAL_ENTITY_TEST_RE, Common::Utils::ENTITY_RE, Common::Utils::HTML_ESCAPE_REPLACE_RE, Common::Utils::HTML_ESCAPE_TEST_RE, Common::Utils::HTML_REPLACEMENTS, Common::Utils::REGEXP_ESCAPE_RE, Common::Utils::UNESCAPE_ALL_RE, Common::Utils::UNESCAPE_MD_RE, Common::Utils::UNICODE_PUNCT_RE

Class Method Summary collapse

Methods included from Common::Utils

arrayReplaceAt, assign, escapeHtml, escapeRE, fromCodePoint, isMdAsciiPunct, isPunctChar, isValidEntityCode, isWhiteSpace, normalizeReference, replaceEntityPattern, unescapeAll, unescapeMd

Class Method Details

.scanDelims(state, start) ⇒ Object

parse sequence of markers, “start” should point at a valid marker



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# File 'lib/motion-markdown-it/rules_inline/strikethrough.rb', line 10

def self.scanDelims(state, start)
  pos       = start
  can_open  = true
  can_close = true
  max       = state.posMax
  marker    = state.src.charCodeAt(start)

  # treat beginning of the line as a whitespace
  lastChar = start > 0 ? state.src.charCodeAt(start - 1) : 0x20

  while (pos < max && state.src.charCodeAt(pos) == marker)
    pos += 1
  end

  if (pos >= max)
    can_open = false
  end

  count = pos - start

  # treat end of the line as a whitespace
  nextChar = pos < max ? state.src.charCodeAt(pos) : 0x20

  isLastPunctChar = isMdAsciiPunct(lastChar) || isPunctChar(lastChar.chr(Encoding::UTF_8))
  isNextPunctChar = isMdAsciiPunct(nextChar) || isPunctChar(nextChar.chr(Encoding::UTF_8))

  isLastWhiteSpace = isWhiteSpace(lastChar)
  isNextWhiteSpace = isWhiteSpace(nextChar)

  if (isNextWhiteSpace)
    can_open = false
  elsif (isNextPunctChar)
    if (!(isLastWhiteSpace || isLastPunctChar))
      can_open = false
    end
  end

  if (isLastWhiteSpace)
    can_close = false
  elsif (isLastPunctChar)
    if (!(isNextWhiteSpace || isNextPunctChar))
      can_close = false
    end
  end

  return { can_open: can_open, can_close: can_close, delims: count }
end

.strikethrough(state, silent) ⇒ Object 



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# File 'lib/motion-markdown-it/rules_inline/strikethrough.rb', line 59

def self.strikethrough(state, silent)
  max    = state.posMax
  start  = state.pos
  marker = state.src.charCodeAt(start)

  return false if (marker != 0x7E) # ~
  return false if (silent)  # don't run any pairs in validation mode

  res        = scanDelims(state, start)
  startCount = res[:delims]
  if (!res[:can_open])
    state.pos += startCount
    # Earlier we checked !silent, but this implementation does not need it
    state.pending += state.src.slice(start...state.pos)
    return true
  end

  stack = (startCount / 2).floor
  return false if (stack <= 0)
  state.pos = start + startCount

  while (state.pos < max)
    if (state.src.charCodeAt(state.pos) == marker)
      res      = scanDelims(state, state.pos)
      count    = res[:delims]
      tagCount = (count / 2).floor
      if (res[:can_close])
        if (tagCount >= stack)
          state.pos += count - 2
          found = true
          break
        end
        stack     -= tagCount
        state.pos += count
        next
      end

      stack += tagCount if (res[:can_open])
      state.pos += count
      next
    end

    state.md.inline.skipToken(state)
  end

  if (!found)
    # parser failed to find ending tag, so it's not valid emphasis
    state.pos = start
    return false
  end

  # found!
  state.posMax = state.pos
  state.pos    = start + 2

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

  state.md.inline.tokenize(state)

  token        = state.push('s_close', 's', -1)
  token.markup = '~~'

  state.pos    = state.posMax + 2
  state.posMax = max
  return true
end