Class: MarkdownIt::RulesInline::Link

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



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# File 'lib/motion-markdown-it/rules_inline/link.rb', line 9

def self.link(state, silent)
  href            = ''
  oldPos          = state.pos
  max             = state.posMax
  start           = state.pos
  parseReference  = true

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

  labelStart = state.pos + 1
  labelEnd   = state.md.helpers.parseLinkLabel(state, state.pos, true)

  # parser failed to find ']', so it's not a valid link
  return false if (labelEnd < 0)

  pos = labelEnd + 1
  if (pos < max && state.src.charCodeAt(pos) == 0x28) # (
    #
    # Inline link
    #

    # might have found a valid shortcut link, disable reference parsing
    parseReference = false

    # [link](  <href>  "title"  )
    #        ^^ skipping these spaces
    pos += 1
    while pos < max
      code = state.src.charCodeAt(pos)
      break if (!isSpace(code) && code != 0x0A)
      pos += 1
    end
    return false if (pos >= max)

    # [link](  <href>  "title"  )
    #          ^^^^^^ parsing link destination
    start = pos
    res   = state.md.helpers.parseLinkDestination(state.src, pos, state.posMax)
    if (res[:ok])
      href = state.md.normalizeLink.call(res[:str])
      if (state.md.validateLink.call(href))
        pos = res[:pos]
      else
        href = ''
      end
    end

    # [link](  <href>  "title"  )
    #                ^^ skipping these spaces
    start = pos
    while pos < max
      code = state.src.charCodeAt(pos)
      break if (!isSpace(code) && code != 0x0A)
      pos += 1
    end

    # [link](  <href>  "title"  )
    #                  ^^^^^^^ parsing link title
    res = state.md.helpers.parseLinkTitle(state.src, pos, state.posMax)
    if (pos < max && start != pos && res[:ok])
      title = res[:str]
      pos   = res[:pos]

      # [link](  <href>  "title"  )
      #                         ^^ skipping these spaces
      while pos < max
        code = state.src.charCodeAt(pos)
        break if (!isSpace(code) && code != 0x0A)
        pos += 1
      end
    else
      title = ''
    end

    if (pos >= max || state.src.charCodeAt(pos) != 0x29) # )
      # parsing a valid shortcut link failed, fallback to reference
      parseReference = true
    end
    pos += 1
  end

  if parseReference
    #
    # Link reference
    #
    return false if state.env[:references].nil?

    if (pos < max && state.src.charCodeAt(pos) == 0x5B)  # [
      start = pos + 1
      pos   = state.md.helpers.parseLinkLabel(state, pos)
      if (pos >= 0)
        label = state.src.slice(start...pos)
        pos += 1
      else
        pos = labelEnd + 1
      end
    else
      pos = labelEnd + 1
    end

    # covers label === '' and label === undefined
    # (collapsed reference link and shortcut reference link respectively)
    label = state.src.slice(labelStart...labelEnd) if label.nil? || label.empty?

    ref = state.env[:references][normalizeReference(label)]
    if (!ref)
      state.pos = oldPos
      return false
    end
    href  = ref[:href]
    title = ref[:title]
  end

  #
  # We found the end of the link, and know for a fact it's a valid link;
  # so all that's left to do is to call tokenizer.
  #
  if (!silent)
    state.pos    = labelStart
    state.posMax = labelEnd

    token        = state.push('link_open', 'a', 1)
    token.attrs  = attrs = [ [ 'href', href ] ]
    unless title.nil? || title.empty?
      attrs.push([ 'title', title ])
    end

    state.md.inline.tokenize(state)

    token        = state.push('link_close', 'a', -1)
  end

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