Class: MarkdownIt::RulesBlock::Reference

Inherits:
Object
  • Object
show all
Extended by:
Common::Utils
Defined in:
lib/motion-markdown-it/rules_block/reference.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, fromCharCode, fromCodePoint, isMdAsciiPunct, isPunctChar, isSpace, isValidEntityCode, isWhiteSpace, normalizeReference, replaceEntityPattern, unescapeAll, unescapeMd

Class Method Details

.reference(state, startLine, _endLine, silent) ⇒ Object 



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# File 'lib/motion-markdown-it/rules_block/reference.rb', line 7

def self.reference(state, startLine, _endLine, silent)
  lines    = 0
  pos      = state.bMarks[startLine] + state.tShift[startLine]
  max      = state.eMarks[startLine]
  nextLine = startLine + 1

   # if it's indented more than 3 spaces, it should be a code block
  return false if state.sCount[startLine] - state.blkIndent >= 4

  return false if state.src.charCodeAt(pos) != 0x5B # [

  # Simple check to quickly interrupt scan on [link](url) at the start of line.
  # Can be useful on practice: https://github.com/markdown-it/markdown-it/issues/54
  pos += 1
  while (pos < max)
    if (state.src.charCodeAt(pos) == 0x5D &&    # ]
        state.src.charCodeAt(pos - 1) != 0x5C)  # \
      return false if (pos + 1 === max)
      return false if (state.src.charCodeAt(pos + 1) != 0x3A)  # :
      break
    end
    pos += 1
  end

  endLine = state.lineMax

  # jump line-by-line until empty one or EOF
  terminatorRules   = state.md.block.ruler.getRules('reference')

  oldParentType     = state.parentType
  state.parentType  = 'reference'

  while nextLine < endLine && !state.isEmpty(nextLine)
    # this would be a code block normally, but after paragraph
    # it's considered a lazy continuation regardless of what's there
    (nextLine += 1) and next if (state.sCount[nextLine] - state.blkIndent > 3)

    # quirk for blockquotes, this line should already be checked by that rule
    (nextLine += 1) and next if state.sCount[nextLine] < 0

    # Some tags can terminate paragraph without empty line.
    terminate = false
    (0...terminatorRules.length).each do |i|
      if (terminatorRules[i].call(state, nextLine, endLine, true))
        terminate = true
        break
      end
    end
    break if (terminate)
    nextLine += 1
  end

  str      = state.getLines(startLine, nextLine, state.blkIndent, false).strip
  max      = str.length
  labelEnd = -1

  pos = 1
  while pos < max
    ch = str.charCodeAt(pos)
    if (ch == 0x5B ) # [
      return false
    elsif (ch == 0x5D) # ]
      labelEnd = pos
      break
    elsif (ch == 0x0A) # \n
      lines += 1
    elsif (ch == 0x5C) # \
      pos += 1
      if (pos < max && str.charCodeAt(pos) == 0x0A)
        lines += 1
      end
    end
    pos += 1
  end

  return false if (labelEnd < 0 || str.charCodeAt(labelEnd + 1) != 0x3A) # :

  # [label]:   destination   'title'
  #         ^^^ skip optional whitespace here
  pos = labelEnd + 2
  while pos < max
    ch = str.charCodeAt(pos)
    if (ch == 0x0A)
      lines += 1
    elsif isSpace(ch)
    else
      break
    end
    pos += 1
  end

  # [label]:   destination   'title'
  #            ^^^^^^^^^^^ parse this
  res = state.md.helpers.parseLinkDestination(str, pos, max)
  return false if (!res[:ok])

  href = state.md.normalizeLink.call(res[:str])
  return false if (!state.md.validateLink.call(href))

  pos    = res[:pos]
  lines += res[:lines]

  # save cursor state, we could require to rollback later
  destEndPos    = pos
  destEndLineNo = lines

  # [label]:   destination   'title'
  #                       ^^^ skipping those spaces
  start = pos
  while (pos < max)
    ch = str.charCodeAt(pos)
    if (ch == 0x0A)
      lines += 1
    elsif isSpace(ch)
    else
      break
    end
    pos += 1
  end

  # [label]:   destination   'title'
  #                          ^^^^^^^ parse this
  res = state.md.helpers.parseLinkTitle(str, pos, max)
  if (pos < max && start != pos && res[:ok])
    title  = res[:str]
    pos    = res[:pos]
    lines += res[:lines]
  else
    title = ''
    pos   = destEndPos
    lines = destEndLineNo
  end

  # skip trailing spaces until the rest of the line
  while pos < max
    ch = str.charCodeAt(pos)
    break if !isSpace(ch)
    pos += 1
  end

  if (pos < max && str.charCodeAt(pos) != 0x0A)
    if (title)
      # garbage at the end of the line after title,
      # but it could still be a valid reference if we roll back
      title = ''
      pos = destEndPos
      lines = destEndLineNo
      while pos < max
        ch = str.charCodeAt(pos)
        break if !isSpace(ch)
        pos += 1
      end
    end
  end

  if (pos < max && str.charCodeAt(pos) != 0x0A)
    # garbage at the end of the line
    return false
  end

  label = normalizeReference(str.slice(1...labelEnd))
  if label == ''
    # CommonMark 0.20 disallows empty labels
    return false
  end

  # Reference can not terminate anything. This check is for safety only.
  # istanbul ignore if
  return true if (silent)

  if (state.env[:references].nil?)
    state.env[:references] = {}
  end
  if state.env[:references][label].nil?
    state.env[:references][label] = { title: title, href: href }
  end

  state.parentType = oldParentType

  state.line = startLine + lines + 1
  return true
end