class YARD::Templates::Helpers::Markup::HybridMarkdown

# File lib/yard/templates/helpers/markup/hybrid_markdown.rb, line 89
def initialize(text, options = {})
  @heading_ids = options.fetch(:heading_ids, true)
  @references = {}
  @text = extract_reference_definitions(text.to_s.gsub(/\r\n?/, "\n"))
end

# File lib/yard/templates/helpers/markup/hybrid_markdown.rb, line 96
def to_html
  parse_blocks(split_lines(@text), 0).join("\n")
end

# File lib/yard/templates/helpers/markup/hybrid_markdown.rb, line 2101
def append_folded_codepoint(buffer, codepoint)
  case codepoint
  when 0x41..0x5A
    buffer << [codepoint + 32].pack('U')
  when 0x0391..0x03A1
    buffer << [codepoint + 32].pack('U')
  when 0x03A3..0x03AB
    buffer << [codepoint + 32].pack('U')
  when 0x03C2
    buffer << [0x03C3].pack('U')
  when 0x00DF, 0x1E9E
    buffer << 'ss'
  else
    begin
      buffer << [codepoint].pack('U').downcase
    rescue StandardError
      buffer << [codepoint].pack('U')
    end
  end
end

# File lib/yard/templates/helpers/markup/hybrid_markdown.rb, line 2074
def ascii_only_compat?(text)
  if text.respond_to?(:ascii_only?)
    text.ascii_only?
  else
    text.to_s.unpack('C*').all? { |byte| byte < 128 }
  end
end

# File lib/yard/templates/helpers/markup/hybrid_markdown.rb, line 1595
def ascii_punctuation_char?(char)
  return false unless ascii_only_compat?(char)

  byte = char.to_s.unpack('C').first
  return false unless byte

  (0x21..0x2F).include?(byte) ||
    (0x3A..0x40).include?(byte) ||
    (0x5B..0x60).include?(byte) ||
    (0x7B..0x7E).include?(byte)
end

# File lib/yard/templates/helpers/markup/hybrid_markdown.rb, line 804
def autolink_urls(text)
  text.gsub(/(^|[^\w\/{"'=])((?:https?:\/\/|mailto:)[^\s<]+)/) do
    match = Regexp.last_match
    prefix = $1
    before_url = text[0...match.begin(2)]
    if before_url.end_with?('&lt;') || before_url.end_with?('&lt; ')
      match[0]
    else
      url, trailer = strip_trailing_punctuation($2)
      %(#{prefix}<a href="#{h(url)}">#{h(url)}</a>#{h(trailer)})
    end
  end
end

# File lib/yard/templates/helpers/markup/hybrid_markdown.rb, line 1537
def available_delimiter_length(token)
  token[:length] - token[:left_consumed] - token[:right_consumed]
end

# File lib/yard/templates/helpers/markup/hybrid_markdown.rb, line 898
def blank_line?(line)
  line.strip.empty?
end

# File lib/yard/templates/helpers/markup/hybrid_markdown.rb, line 1129
def block_boundary?(line)
  thematic_break?(line) || parse_heading(line) || fenced_code_start?(line) ||
    table_row?(line) || labeled_list_start?([line, ''], 0) || blockquote_start?(line) ||
    html_block_start?(line) || parse_list_marker(line)
end

# File lib/yard/templates/helpers/markup/hybrid_markdown.rb, line 1986
def blockquote_open_fence?(quoted_lines)
  opener = nil

  quoted_lines.each do |quoted|
    next if blank_line?(quoted)

    if opener
      opener = nil if fence_closer?(quoted, opener[:char], opener[:length])
    else
      opener = parse_fence_opener(quoted)
    end
  end

  !opener.nil?
end

# File lib/yard/templates/helpers/markup/hybrid_markdown.rb, line 2002
def blockquote_paragraph_context?(quoted_lines)
  last_content = quoted_lines.reverse.find { |quoted| !blank_line?(quoted) }
  return false unless last_content
  return false if fenced_code_start?(last_content)
  return false if parse_heading(last_content)
  return false if thematic_break?(last_content)

  true
end

# File lib/yard/templates/helpers/markup/hybrid_markdown.rb, line 951
def blockquote_start?(line)
  !strip_blockquote_marker(line).nil?
end

# File lib/yard/templates/helpers/markup/hybrid_markdown.rb, line 994
def code_block(text, lang = nil)
  lang, text = extract_codeblock_language(text, lang)
  attrs = lang ? %( class="#{h(lang)}") : ''
  "<pre><code#{attrs}>#{h(text)}</code></pre>"
end

# File lib/yard/templates/helpers/markup/hybrid_markdown.rb, line 1922
def consume_columns(text, columns, start_column = 0, normalize_remaining = false)
  index = 0
  column = start_column
  remaining = columns
  prefix_width = 0
  source = text.to_s

  while index < source.length && remaining > 0
    char = source[index, 1]
    if char == ' '
      column += 1
      remaining -= 1
      index += 1
    elsif char == "\t"
      advance = TAB_WIDTH - (column % TAB_WIDTH)
      if advance <= remaining
        column += advance
        remaining -= advance
        index += 1
      else
        prefix_width += advance - remaining if normalize_remaining
        column += advance
        remaining = 0
        index += 1
      end
    else
      break
    end
  end

  if normalize_remaining
    while index < source.length
      char = source[index, 1]
      if char == ' '
        prefix_width += 1
        column += 1
        index += 1
      elsif char == "\t"
        advance = TAB_WIDTH - (column % TAB_WIDTH)
        prefix_width += advance
        column += advance
        index += 1
      else
        break
      end
    end

    (' ' * prefix_width) + source[index..-1].to_s
  else
    source[index..-1].to_s
  end
end

# File lib/yard/templates/helpers/markup/hybrid_markdown.rb, line 1756
def contains_nested_link?(label, placeholders)
  text = restore_placeholders(label.to_s, placeholders)
  return true if text.include?('<a ')

  index = 0

  while index < text.length
    if text[index, 2] == '![' && (index.zero? || text[index - 1, 1] != '\\')
      label_open = index + 1
    elsif text[index, 1] == '[' && (index.zero? || text[index - 1, 1] != '\\')
      label_open = index
    else
      index += 1
      next
    end

    label_close = find_closing_bracket(text, label_open)
    if label_close
      next_char = text[label_close + 1, 1]
      return true if next_char == '(' || next_char == '['
    end

    index += 1
  end

  false
end

# File lib/yard/templates/helpers/markup/hybrid_markdown.rb, line 1514
def decode_entities(text)
  text.gsub(ENTITY_RE) do |entity|
    decode_entity(entity)
  end
end

# File lib/yard/templates/helpers/markup/hybrid_markdown.rb, line 1848
def decode_entity(entity)
  case entity
  when /\A&#(\d+);\z/
    codepoint = $1.to_i
  when /\A&#[xX]([0-9A-Fa-f]+);\z/
    codepoint = $1.to_i(16)
  else
    name = entity[1..-2]
    return [0x00E4].pack('U') if name == 'auml'
    return NAMED_ENTITIES[name] || CGI.unescapeHTML(entity)
  end

  return [0xFFFD].pack('U') if codepoint.zero?
  return entity if codepoint > 0x10FFFF
  [codepoint].pack('U')
rescue RangeError
  entity
end

# File lib/yard/templates/helpers/markup/hybrid_markdown.rb, line 1550
def delimiter_flags(text, run_start, run_end, char)
  before = run_start.zero? ? nil : text[run_start - 1, 1]
  after = run_end >= text.length ? nil : text[run_end, 1]
  before_whitespace = whitespace_char?(before)
  after_whitespace = whitespace_char?(after)
  before_punctuation = punctuation_char?(before)
  after_punctuation = punctuation_char?(after)

  left_flanking = !after_whitespace && (!after_punctuation || before_whitespace || before_punctuation)
  right_flanking = !before_whitespace && (!before_punctuation || after_whitespace || after_punctuation)

  if char == '_'
    [
      left_flanking && (!right_flanking || before_punctuation),
      right_flanking && (!left_flanking || after_punctuation)
    ]
  else
    [left_flanking, right_flanking]
  end
end

# File lib/yard/templates/helpers/markup/hybrid_markdown.rb, line 2066
def each_char_compat(text)
  if text.respond_to?(:each_char)
    text.each_char { |char| yield char }
  else
    text.scan(/./m) { |char| yield char }
  end
end

# File lib/yard/templates/helpers/markup/hybrid_markdown.rb, line 1638
def escape_autolink_url(url)
  percent_encode_url(url.to_s, /[A-Za-z0-9\-._~:\/?#@!$&'()*+,;=%]/)
end

# File lib/yard/templates/helpers/markup/hybrid_markdown.rb, line 1619
def escape_list_marker_text(line)
  source = line.to_s.sub(/\n\z/, '')
  newline = source.length == line.to_s.length ? '' : "\n"

  if source =~ /\A([*+-])([ \t].*)\z/
    "\\#{$1}#{$2}#{newline}"
  elsif source =~ /\A(\d{1,9}[.)])([ \t].*)\z/
    "\\#{$1}#{$2}#{newline}"
  elsif source =~ /\A([A-Za-z]\.)([ \t].*)\z/
    "\\#{$1}#{$2}#{newline}"
  else
    source + newline
  end
end

# File lib/yard/templates/helpers/markup/hybrid_markdown.rb, line 1634
def escape_url(url)
  percent_encode_url(url.to_s, /[A-Za-z0-9\-._~:\/?#\[\]@!$&'()*+,;=%]/)
end

# File lib/yard/templates/helpers/markup/hybrid_markdown.rb, line 1000
def extract_codeblock_language(text, lang = nil)
  return [lang, text] unless text =~ CODE_LANG_RE

  lang ||= unescape_markdown_punctuation(decode_entities($1))
  [lang, $']
end

# File lib/yard/templates/helpers/markup/hybrid_markdown.rb, line 833
def extract_reference_definitions(text)
  lines = split_lines(text)
  kept_lines = []
  index = 0
  in_fenced_code = false
  previous_line = nil

  while index < lines.length
    line = lines[index]
    if fenced_code_start?(line)
      in_fenced_code = !in_fenced_code
      kept_lines << line
      index += 1
      previous_line = line
      next
    end

    if in_fenced_code
      kept_lines << line
      index += 1
      previous_line = line
      next
    end

    parsed = parse_reference_definition_block(lines, index, previous_line)
    if parsed
      normalized = normalize_reference_label(parsed[:label])
      @references[normalized] ||= parsed[:reference] unless normalized.empty?
      kept_lines.concat(parsed[:replacement_lines])
      index = parsed[:next_index]
      previous_line = kept_lines.last
      next
    end

    kept_lines << line
    index += 1
    previous_line = line
  end

  kept_lines.join
end

# File lib/yard/templates/helpers/markup/hybrid_markdown.rb, line 1049
def fence_closer?(line, char, min_length)
  stripped = line.sub(/^\s{0,3}/, '')
  return false unless stripped.start_with?(char)

  run = stripped[/\A#{Regexp.escape(char)}+/]
  run && run.length >= min_length && stripped.sub(/\A#{Regexp.escape(run)}/, '').strip.empty?
end

# File lib/yard/templates/helpers/markup/hybrid_markdown.rb, line 910
def fenced_code_start?(line)
  !!parse_fence_opener(line)
end

# File lib/yard/templates/helpers/markup/hybrid_markdown.rb, line 1480
def find_braced_text_link_label_end(text, index)
  cursor = index + 1

  while cursor < text.length
    char = text[cursor, 1]

    if char == '\\'
      cursor += 2
      next
    end

    return cursor if char == '}'
    cursor += 1
  end

  nil
end

# File lib/yard/templates/helpers/markup/hybrid_markdown.rb, line 1314
def find_closing_bracket(text, open_index)
  depth = 0
  index = open_index
  while index < text.length
    char = text[index, 1]
    if char == '['
      depth += 1
    elsif char == ']'
      depth -= 1
      return index if depth.zero?
    elsif char == '\\'
      index += 1
    end
    index += 1
  end
  nil
end

# File lib/yard/templates/helpers/markup/hybrid_markdown.rb, line 1332
def find_matching_backtick_run(text, index, length)
  while index < text.length
    if text[index, 1] == '`'
      run_length = 1
      run_length += 1 while index + run_length < text.length && text[index + run_length, 1] == '`'
      return index if run_length == length

      index += run_length
      next
    end
    index += 1
  end

  nil
end

# File lib/yard/templates/helpers/markup/hybrid_markdown.rb, line 1737
def find_reference_label_end(text)
  return nil unless text.start_with?('[')

  index = 1
  while index < text.length
    char = text[index, 1]
    if char == '\\'
      index += 2
      next
    end
    return nil if char == '['
    return index if char == ']' && text[index + 1, 1] == ':'

    index += 1
  end

  nil
end

# File lib/yard/templates/helpers/markup/hybrid_markdown.rb, line 733
def format_emphasis(text)
  delimiters = []
  output = []
  index = 0

  while index < text.length
    char = text[index, 1]
    if char == '*' || char == '_'
      run_end = index
      run_end += 1 while run_end < text.length && text[run_end, 1] == char
      run_length = run_end - index
      can_open, can_close = delimiter_flags(text, index, run_end, char)
      token = {
        :char => char,
        :length => run_length,
        :position => output.length,
        :left_consumed => 0,
        :right_consumed => 0,
        :opening_html => String.new,
        :closing_html => String.new,
        :can_open => can_open,
        :can_close => can_close
      }
      output << token

      if can_close
        delimiter_index = delimiters.length - 1
        while delimiter_index >= 0 && available_delimiter_length(token) > 0
          opener = delimiters[delimiter_index]
          if opener[:char] == char && available_delimiter_length(opener) > 0 &&
              !odd_match_disallowed?(opener, token)
            use = available_delimiter_length(opener) >= 2 &&
              available_delimiter_length(token) >= 2 ? 2 : 1
            opener[:right_consumed] += use
            opener[:opening_html] = (use == 2 ? '<strong>' : '<em>') + opener[:opening_html]
            token[:left_consumed] += use
            token[:closing_html] << (use == 2 ? '</strong>' : '</em>')
            delimiters.reject! do |candidate|
              candidate[:position] > opener[:position] &&
                candidate[:position] < token[:position] &&
                available_delimiter_length(candidate) > 0
            end
            delimiters.delete_at(delimiter_index) if available_delimiter_length(opener).zero?
            delimiter_index = delimiters.length - 1
          else
            delimiter_index -= 1
          end
        end
      end

      delimiters << token if can_open && available_delimiter_length(token) > 0
      index = run_end
    else
      output << char
      index += 1
    end
  end

  output.map do |piece|
    next piece if piece.is_a?(String)

    piece[:closing_html] +
      (piece[:char] * available_delimiter_length(piece)) +
      piece[:opening_html]
  end.join
end

# File lib/yard/templates/helpers/markup/hybrid_markdown.rb, line 524
def format_inline(text)
  placeholders = []
  text = protect_yard_links(text, placeholders)
  text = protect_raw_html(text, placeholders)
  text = protect_code_spans(text, placeholders)
  text = protect_autolinks(text, placeholders)
  text = protect_hard_breaks(text, placeholders)
  text = protect_inline_images(text, placeholders)
  text = protect_inline_links(text, placeholders)
  text = protect_braced_text_links(text, placeholders)
  text = protect_single_word_text_links(text, placeholders)
  text = protect_reference_images(text, placeholders)
  text = protect_reference_links(text, placeholders)
  text = protect_escaped_characters(text, placeholders)
  text = protect_entities(text, placeholders)
  text = text.gsub(/[ \t]+\n/, "\n")
  text = h(text)
  text = format_emphasis(text)
  text = format_strikethrough(text)
  restore_placeholders(autolink_urls(text), placeholders)
end

# File lib/yard/templates/helpers/markup/hybrid_markdown.rb, line 800
def format_strikethrough(text)
  text.gsub(/~~([^\n~](?:.*?[^\n~])?)~~/, '<del>\1</del>')
end

# File lib/yard/templates/helpers/markup/hybrid_markdown.rb, line 1867
def h(text)
  text.to_s.gsub('&', '&amp;').gsub('<', '&lt;').gsub('>', '&gt;').gsub('"', '&quot;')
end

# File lib/yard/templates/helpers/markup/hybrid_markdown.rb, line 1016
def heading_id(text)
  return '' unless @heading_ids

  " id=\"#{text.gsub(/\W/, '_')}\""
end

# File lib/yard/templates/helpers/markup/hybrid_markdown.rb, line 1829
def html_block_end?(type, line)
  case type
  when 1
    line =~ %r{</(?:script|pre|style|textarea)\s*>}i
  when 2
    line.include?('-->')
  when 3
    line.include?('?>')
  when 4
    line.include?('>')
  when 5
    line.include?(']]>')
  when 6, 7
    blank_line?(line)
  else
    false
  end
end

# File lib/yard/templates/helpers/markup/hybrid_markdown.rb, line 955
def html_block_start?(line, interrupt_paragraph = false)
  !html_block_type(line, interrupt_paragraph).nil?
end

# File lib/yard/templates/helpers/markup/hybrid_markdown.rb, line 1812
def html_block_type(line, interrupt_paragraph = false)
  stripped = line.chomp
  return nil unless stripped =~ /^\s{0,3}</ || stripped =~ /^\s{0,3}<(?!!--)/

  return 1 if stripped =~ /^\s{0,3}<(?:script|pre|style|textarea)(?:\s|>|$)/i
  return 2 if stripped =~ /^\s{0,3}<!--/
  return 3 if stripped =~ /^\s{0,3}<\?/
  return 4 if stripped =~ /^\s{0,3}<![A-Z]/
  return 5 if stripped =~ /^\s{0,3}<!\[CDATA\[/
  return 6 if stripped =~ /^\s{0,3}<\/?(?:#{HTML_BLOCK_TAGS.join('|')})(?:\s|\/?>|$)/i
  return nil if interrupt_paragraph

  return 7 if stripped =~ /^\s{0,3}(?:<[A-Za-z][A-Za-z0-9-]*(?:\s+[A-Za-z_:][\w:.-]*(?:\s*=\s*(?:"[^"]*"|'[^']*'|[^\s"'=<>`]+))?)*\s*\/?>|<\/[A-Za-z][A-Za-z0-9-]*\s*>)\s*$/

  nil
end

# File lib/yard/templates/helpers/markup/hybrid_markdown.rb, line 1506
def image_html(label, dest, title = nil)
  src = escape_url(unescape_markdown_punctuation(decode_entities(dest.to_s)))
  normalized_title = title && unescape_markdown_punctuation(decode_entities(title))
  attrs = %( src="#{h(src)}" alt="#{h(plain_text(label))}")
  attrs += %( title="#{h(normalized_title)}") if normalized_title
  "<img#{attrs} />"
end

# File lib/yard/templates/helpers/markup/hybrid_markdown.rb, line 918
def indented_code_block_start?(lines, index, previous_block_type = nil)
  return false unless indented_code_start?(lines[index])
  return true if leading_columns(lines[index]) >= 4
  return false if previous_block_type == :list
  return false if html_block_start?(lines[index])
  return false if parse_setext_heading(lines, index)

  !index.zero? && blank_line?(lines[index - 1])
end

# File lib/yard/templates/helpers/markup/hybrid_markdown.rb, line 914
def indented_code_start?(line)
  leading_columns(line) >= 2
end

# File lib/yard/templates/helpers/markup/hybrid_markdown.rb, line 1611
def indented_to?(line, indent)
  leading_columns(line) >= indent
end

# File lib/yard/templates/helpers/markup/hybrid_markdown.rb, line 577
def inside_angle_autolink_candidate?(text, index)
  opening = text.rindex('<', index)
  return false unless opening

  closing = text.rindex('>', index)
  return false if closing && closing > opening

  candidate = text[opening...index]
  return false if candidate =~ /\s/

  candidate =~ /\A<(?:[A-Za-z][A-Za-z0-9.+-]{1,31}:|[A-Za-z0-9.!#$%&'*+\/=?^_`{|}~-]+@)/
end

# File lib/yard/templates/helpers/markup/hybrid_markdown.rb, line 945
def labeled_list_start?(lines, index)
  line = lines[index]
  return true if line =~ LABEL_LIST_COLON_RE
  false
end

# File lib/yard/templates/helpers/markup/hybrid_markdown.rb, line 1975
def lazy_blockquote_continuation?(quoted_lines, line)
  return false if block_boundary?(line)
  return false if indented_code_start?(line) && !blockquote_paragraph_context?(quoted_lines)

  last_content = quoted_lines.reverse.find { |quoted| !blank_line?(quoted) }
  return false if last_content && fenced_code_start?(last_content)
  return false if last_content && indented_code_start?(last_content)

  true
end

# File lib/yard/templates/helpers/markup/hybrid_markdown.rb, line 1607
def leading_columns(line)
  scan_leading_columns(line.to_s).first
end

# File lib/yard/templates/helpers/markup/hybrid_markdown.rb, line 1498
def link_html(label, dest, title = nil)
  href = escape_url(unescape_markdown_punctuation(decode_entities(dest.to_s)))
  normalized_title = title && unescape_markdown_punctuation(decode_entities(title))
  attrs = %( href="#{h(href)}")
  attrs += %( title="#{h(normalized_title)}") if normalized_title
  %(<a#{attrs}>#{format_inline(label)}</a>)
end

# File lib/yard/templates/helpers/markup/hybrid_markdown.rb, line 1118
def list_item_padding(marker)
  (1..4).include?(marker[:padding]) ? marker[:padding] : 1
end

# File lib/yard/templates/helpers/markup/hybrid_markdown.rb, line 936
def list_start?(line, interrupt_paragraph = false)
  return false unless (marker = parse_list_marker(line))
  return true unless interrupt_paragraph

  return false if marker[:content].empty?

  !marker[:ordered] || marker[:start] == 1
end

# File lib/yard/templates/helpers/markup/hybrid_markdown.rb, line 2041
def loose_list_item_continuation?(item_lines)
  return false if open_fence_in_lines?(item_lines)

  previous = item_lines.reverse.find { |item_line| item_line != "\n" }
  return true unless previous

  !parse_list_marker(previous.chomp)
end

# File lib/yard/templates/helpers/markup/hybrid_markdown.rb, line 1528
def normalize_code_span(code)
  code = code.gsub(/\n/, ' ')
  if code.length > 1 && code.start_with?(' ') && code.end_with?(' ') && code.strip != ''
    code[1...-1]
  else
    code
  end
end

# File lib/yard/templates/helpers/markup/hybrid_markdown.rb, line 2016
def normalize_heading_line(line)
  normalize_paragraph_line(line).rstrip
end

# File lib/yard/templates/helpers/markup/hybrid_markdown.rb, line 2012
def normalize_paragraph_line(line)
  line.to_s.chomp.sub(/^\s+/, '')
end

# File lib/yard/templates/helpers/markup/hybrid_markdown.rb, line 875
def normalize_reference_label(label)
  normalized = label.to_s.gsub(/\\([\[\]])/, '\1').gsub(/\s+/, ' ').strip
  unicode_casefold_compat(normalized)
end

# File lib/yard/templates/helpers/markup/hybrid_markdown.rb, line 1541
def odd_match_disallowed?(opener, closer)
  return false unless opener[:can_close] || closer[:can_open]

  opener_len = available_delimiter_length(opener)
  closer_len = available_delimiter_length(closer)
  ((opener_len + closer_len) % 3).zero? &&
    (opener_len % 3 != 0 || closer_len % 3 != 0)
end

# File lib/yard/templates/helpers/markup/hybrid_markdown.rb, line 2050
def open_fence_in_lines?(lines)
  opener = nil

  lines.each do |line|
    next if blank_line?(line)

    if opener
      opener = nil if fence_closer?(line, opener[:char], opener[:length])
    else
      opener = parse_fence_opener(line)
    end
  end

  !opener.nil?
end

# File lib/yard/templates/helpers/markup/hybrid_markdown.rb, line 1022
def parse_atx_heading(line)
  stripped = line.chomp.sub(/^\s{0,3}/, '')
  match = stripped.match(/\A(#{'#' * 6}|#{'#' * 5}|#{'#' * 4}|#{'#' * 3}|#{'#' * 2}|#)(?=[ \t]|$)(.*)\z/)
  return nil unless match

  level = match[1].length
  content = match[2]
  content = content.sub(/\A[ \t]+/, '')
  content = content.sub(/[ \t]+#+[ \t]*\z/, '')
  content = '' if content =~ /\A#+\z/
  content = content.rstrip
  "<h#{level}#{heading_id(content)}>#{format_inline(content)}</h#{level}>"
end

# File lib/yard/templates/helpers/markup/hybrid_markdown.rb, line 443
def parse_blockquote(lines, index)
  quoted_lines = []
  saw_quote = false
  previous_blank = false

  while index < lines.length
    line = lines[index]
    break if saw_quote && quoted_lines.last == "\n" && !blockquote_start?(line)
    break if saw_quote && blank_line?(line) && blockquote_open_fence?(quoted_lines)
    break if saw_quote && previous_blank
    break if saw_quote && !blank_line?(line) && !blockquote_start?(line) &&
      !lazy_blockquote_continuation?(quoted_lines, line)
    break unless blank_line?(line) || blockquote_start?(line) || saw_quote

    if blank_line?(line)
      quoted_lines << "\n"
      previous_blank = true
    elsif (stripped = strip_blockquote_marker(line))
      quoted_lines << stripped
      saw_quote = true
      previous_blank = false
    else
      if setext_underline_line?(line)
        quoted_lines << "    #{line.lstrip}"
      else
        quoted_lines << line
      end
      previous_blank = false
    end
    index += 1
  end

  inner_html = parse_blocks(quoted_lines, 0).join("\n")
  [inner_html.empty? ? "<blockquote>\n</blockquote>" : "<blockquote>\n#{inner_html}\n</blockquote>", index]
end

# File lib/yard/templates/helpers/markup/hybrid_markdown.rb, line 102
def parse_blocks(lines, index)
  blocks = []
  previous_block_type = nil

  while index < lines.length
    line = lines[index]

    if blank_line?(line)
      index += 1
    elsif yard_indented_code_start?(lines, index)
      block, index = parse_yard_indented_code(lines, index)
      blocks << block
      previous_block_type = :code
    elsif indented_code_block_start?(lines, index, previous_block_type)
      block, index = parse_indented_code(lines, index)
      blocks << block
      previous_block_type = :code
    elsif thematic_break?(line)
      blocks << '<hr />'
      index += 1
      previous_block_type = :hr
    elsif (heading = parse_setext_heading(lines, index))
      blocks << heading[0]
      index = heading[1]
      previous_block_type = :heading
    elsif (heading = parse_heading(line))
      blocks << heading
      index += 1
      previous_block_type = :heading
    elsif fenced_code_start?(line)
      block, index = parse_fenced_code(lines, index)
      blocks << block
      previous_block_type = :code
    elsif table_start?(lines, index)
      block, index = parse_table(lines, index)
      blocks << block
      previous_block_type = :table
    elsif labeled_list_start?(lines, index)
      block, index = parse_labeled_list(lines, index)
      blocks << block
      previous_block_type = :list
    elsif blockquote_start?(line)
      block, index = parse_blockquote(lines, index)
      blocks << block
      previous_block_type = :blockquote
    elsif list_start?(line)
      block, index = parse_list(lines, index)
      blocks << block
      previous_block_type = :list
    elsif html_block_start?(line)
      block, index = parse_html_block(lines, index)
      blocks << block
      previous_block_type = :html
    else
      block, index = parse_paragraph(lines, index)
      blocks << block unless block.empty?
      previous_block_type = :paragraph unless block.empty?
    end
  end

  blocks
end

# File lib/yard/templates/helpers/markup/hybrid_markdown.rb, line 1036
def parse_fence_opener(line)
  match = line.match(FENCE_RE)
  return nil unless match

  indent = match[1].length
  fence = match[2]
  info = match[3].to_s.strip
  return nil if fence.start_with?('`') && info.include?('`')

  lang = info.empty? ? nil : unescape_markdown_punctuation(decode_entities(info.split(/[ \t]/, 2).first))
  {:char => fence[0, 1], :length => fence.length, :indent => indent, :lang => lang}
end

# File lib/yard/templates/helpers/markup/hybrid_markdown.rb, line 216
def parse_fenced_code(lines, index)
  opener = parse_fence_opener(lines[index])
  fence_char = opener[:char]
  fence_length = opener[:length]
  indent = opener[:indent]
  lang = opener[:lang]
  index += 1
  body = []

  while index < lines.length
    break if fence_closer?(lines[index], fence_char, fence_length)

    body << strip_fenced_indent(lines[index], indent)
    index += 1
  end

  index += 1 if index < lines.length
  [code_block(body.join, lang), index]
end

# File lib/yard/templates/helpers/markup/hybrid_markdown.rb, line 165
def parse_heading(line)
  if (heading = parse_atx_heading(line))
    return heading
  end

  match = RDOC_HEADING_RE.match(line)
  return unless match

  heading_marks = match[1]
  heading_text = match[2].strip
  return nil if heading_text =~ /\A[=\-]+\z/

  level = [heading_marks.length, 6].min
  "<h#{level}#{heading_id(heading_text)}>#{format_inline(heading_text)}</h#{level}>"
end

# File lib/yard/templates/helpers/markup/hybrid_markdown.rb, line 479
def parse_html_block(lines, index)
  html = []
  type = html_block_type(lines[index])
  return ['', index] unless type

  while index < lines.length
    line = lines[index]
    break if html.any? && [6, 7].include?(type) && html_block_end?(type, line)
    break unless html.any? || html_block_type(line)

    html << line.chomp
    if html_block_end?(type, line)
      index += 1
      break
    end
    index += 1
  end

  [html.join("\n"), index]
end

# File lib/yard/templates/helpers/markup/hybrid_markdown.rb, line 236
def parse_indented_code(lines, index)
  body = []
  previous_blank = false

  while index < lines.length
    line = lines[index]
    break if previous_blank && html_block_start?(line)
    break unless blank_line?(line) || indented_code_start?(line)
    body << line
    previous_blank = blank_line?(line)
    index += 1
  end

  body.pop while body.any? && blank_line?(body.last)
  [code_block(unindent_indented_code(body)), index]
end

# File lib/yard/templates/helpers/markup/hybrid_markdown.rb, line 1348
def parse_inline_destination(text, index, placeholders = nil)
  while index < text.length && text[index, 1] =~ /[ \t\n]/
    index += 1
  end

  if text[index, 1] == '<'
    close = text.index('>', index + 1)
    return [nil, nil, nil] unless close
    dest = text[(index + 1)...close]
    return [nil, nil, nil] if dest.include?("\n") || dest.include?('\\')
    dest = dest.gsub(' ', '%20')
    index = close + 1
  else
    close = index
    parens = 0
    while close < text.length
      char = text[close, 1]
      if char == '\\' && close + 1 < text.length
        close += 2
        next
      end
      break if parens.zero? && (char == ')' || char =~ /\s/)
      parens += 1 if char == '('
      parens -= 1 if char == ')'
      close += 1
    end
    dest = text[index...close]
    index = close
  end

  if placeholders
    restored_dest = restore_placeholders(dest.to_s, placeholders)
    if restored_dest.start_with?('<')
      return [nil, nil, nil] if restored_dest.include?("\n") || restored_dest.include?('\\')
      return [nil, nil, nil] unless restored_dest.end_with?('>') && restored_dest.index('>') == restored_dest.length - 1

      dest = restored_dest[1...-1]
    end
  end

  while index < text.length && text[index, 1] =~ /[ \t\n]/
    index += 1
  end

  title = nil
  if text[index, 1] == '"' || text[index, 1] == "'"
    delimiter = text[index, 1]
    index += 1
    buffer = String.new
    while index < text.length
      char = text[index, 1]
      if char == '\\' && index + 1 < text.length
        buffer << text[index, 2]
        index += 2
        next
      end
      break if char == delimiter
      buffer << char
      index += 1
    end
    return [nil, nil, nil] unless index < text.length && text[index, 1] == delimiter
    title = buffer
    index += 1
  elsif text[index, 1] == '('
    index += 1
    buffer = String.new
    depth = 1
    while index < text.length
      char = text[index, 1]
      if char == '\\' && index + 1 < text.length
        buffer << text[index, 2]
        index += 2
        next
      end
      if char == '('
        depth += 1
      elsif char == ')'
        depth -= 1
        break if depth.zero?
      end
      buffer << char
      index += 1
    end
    return [nil, nil, nil] unless index < text.length && text[index, 1] == ')'
    title = buffer
    index += 1
  end

  while index < text.length && text[index, 1] =~ /[ \t\n]/
    index += 1
  end
  return [nil, nil, nil] unless text[index, 1] == ')'

  [dest.to_s, title, index + 1]
end

# File lib/yard/templates/helpers/markup/hybrid_markdown.rb, line 408
def parse_labeled_list(lines, index)
  items = []

  while index < lines.length
    label, body = parse_labeled_list_line(lines[index])
    break unless label

    index += 1
    body_lines = []
    body_lines << body if body && !body.empty?

    while index < lines.length
      line = lines[index]
      break if blank_line?(line)
      break if parse_labeled_list_line(line)
      break if !line.strip.empty? && !line.match(/^(?: {2,}|\t)/)

      body_lines << line.sub(/^(?: {2,}|\t)/, '').chomp
      index += 1
    end

    body_html =
      if body_lines.empty?
        ''
      else
        parse_blocks(body_lines.map { |l| "#{l}\n" }, 0).join("\n")
      end

    items << "<dt>#{format_inline(label)}</dt>\n<dd>#{body_html}</dd>"
    index += 1 while index < lines.length && blank_line?(lines[index])
  end

  ["<dl>\n#{items.join("\n")}\n</dl>", index]
end

# File lib/yard/templates/helpers/markup/hybrid_markdown.rb, line 827
def parse_labeled_list_line(line)
  return [$1, $2] if line =~ LABEL_LIST_COLON_RE

  nil
end

# File lib/yard/templates/helpers/markup/hybrid_markdown.rb, line 296
def parse_list(lines, index)
  marker = parse_list_marker(lines[index])
  ordered = marker[:ordered]
  tag = ordered ? 'ol' : 'ul'
  start_attr = ordered && marker[:start] != 1 ? %( start="#{marker[:start]}") : ''
  items = []
  tight = true
  list_indent = marker[:indent]

  while index < lines.length
    break if items.any? && thematic_break?(lines[index]) && leading_columns(lines[index]) <= list_indent + 3

    item_marker = parse_list_marker(lines[index])
    break unless item_marker && same_list_type?(marker, item_marker)

    effective_padding = list_item_padding(item_marker)
    content_indent = item_marker[:indent] + item_marker[:marker_length] + effective_padding
    lazy_indent = item_marker[:indent] + effective_padding
    item_lines = []
    first_line = item_marker[:content]
    unless first_line.empty?
      leading = [item_marker[:padding] - effective_padding, 0].max
      item_lines << "#{' ' * leading}#{first_line}\n"
    end
    index += 1
    blank_seen = false
    item_loose = false

    while index < lines.length
      line = lines[index]
      break if thematic_break?(line) && !indented_to?(line, content_indent)
      break if setext_underline_line?(line) && !indented_to?(line, content_indent)

      next_marker = parse_list_marker(line)
      if next_marker && same_list_type?(marker, next_marker) &&
          (next_marker[:indent] == item_marker[:indent] || (blank_seen && next_marker[:indent] <= list_indent + 3))
        if blank_seen
          tight = false
        end
        break
      end
      break if next_marker && next_marker[:indent] < content_indent
      break if !blank_seen && !indented_to?(line, content_indent) && block_boundary?(line)

      if blank_line?(line)
        item_lines << "\n"
        blank_seen = true
      elsif blank_seen && indented_to?(line, content_indent)
        break if first_line.empty? && item_lines.all? { |item_line| item_line == "\n" } &&
          leading_columns(line) == content_indent
        item_loose = true if loose_list_item_continuation?(item_lines)
        stripped = strip_list_item_indent(line, content_indent)
        item_lines << stripped
        blank_seen = false
      elsif !blank_seen && indented_to?(line, content_indent)
        stripped = strip_list_item_indent(line, content_indent)
        item_lines << stripped
        blank_seen = false
      elsif !blank_seen
        stripped = strip_list_item_indent(line, lazy_indent)
        stripped = escape_list_marker_text(stripped) if parse_list_marker(stripped)
        item_lines << stripped
        blank_seen = false
      else
        break
      end

      index += 1
    end

    item_blocks = parse_blocks(item_lines, 0)
    item_html = item_blocks.join("\n")
    item_html = format_inline(first_line) if item_html.empty? && !first_line.empty?

    simple_item = !item_loose &&
      item_blocks.length == 1 &&
      item_html =~ /\A<p>(.*?)<\/p>\z/m &&
      item_html !~ /<(?:pre|blockquote|ul|ol|dl|table|h\d|hr)/m

    if item_html.empty?
      item_html = ''
    else
      item_loose ||= item_blocks.count { |block| block.start_with?('<p>') } > 1
    end

    tight &&= !item_loose
    items << {:html => item_html, :simple => simple_item}
  end

  items.map! do |item|
    item_html = item[:html]
    item_html = "<p>#{item_html}</p>" if !tight && !item_html.empty? && item_html !~ /\A</m
    item_html = item_html.sub(/\A<p>(.*?)<\/p>(?=\n<(?:ul|ol|blockquote|pre|h\d|table|hr))/m, '\1') if tight
    item_html = item_html.sub(/\n<p>(.*?)<\/p>\z/m, "\n\\1") if tight
    item_html = item_html.sub(/\A<p>(.*?)<\/p>\z/m, '\1') if item[:simple] && tight

    if item_html.empty?
      '<li></li>'
    elsif item[:simple] && tight
      "<li>#{item_html}</li>"
    elsif item_html !~ /\A</m
      suffix = item_html.include?("\n") ? "\n" : ''
      "<li>#{item_html}#{suffix}</li>"
    else
      suffix = item_html =~ /(?:<\/(?:p|pre|blockquote|ul|ol|dl|table|h\d)>|<hr \/>|<[A-Za-z][A-Za-z0-9-]*>)\z/m ? "\n" : ''
      "<li>\n#{item_html}#{suffix}</li>"
    end
  end

  ["<#{tag}#{start_attr}>\n#{items.join("\n")}\n</#{tag}>", index]
end

# File lib/yard/templates/helpers/markup/hybrid_markdown.rb, line 1063
def parse_list_marker(line)
  source = line.to_s.sub(/\n\z/, '')
  indent, index = scan_leading_columns(source)
  return nil if indent > 3
  return nil if index >= source.length

  char = source[index, 1]
  current_column = indent

  if '*+-'.include?(char)
    marker_length = 1
    marker_end = index + 1
    current_column += 1
    padding, marker_end = scan_padding_columns(source, marker_end, current_column)
    content = source[marker_end..-1].to_s
    return nil if padding.zero? && !content.empty?

    return {:ordered => false, :bullet => char, :indent => indent,
            :marker_length => marker_length, :padding => padding, :content => content}
  end

  number = source[index..-1][/^\d{1,9}/]
  if number
    marker_end = index + number.length
    delimiter = source[marker_end, 1]
    if delimiter == '.' || delimiter == ')'
      marker_length = number.length + 1
      current_column += marker_length
      marker_end += 1
      padding, marker_end = scan_padding_columns(source, marker_end, current_column)
      content = source[marker_end..-1].to_s
      return nil if padding.zero? && !content.empty?

      return {:ordered => true, :delimiter => delimiter, :start => number.to_i,
              :indent => indent, :marker_length => marker_length,
              :padding => padding, :content => content}
    end
  end

  if source[index, 2] =~ /\A[A-Za-z]\.\z/
    marker_length = 2
    marker_end = index + marker_length
    current_column += marker_length
    padding, marker_end = scan_padding_columns(source, marker_end, current_column)
    content = source[marker_end..-1].to_s
    return nil if padding.zero? && !content.empty?

    return {:ordered => true, :delimiter => '.', :start => 1,
            :indent => indent, :marker_length => marker_length,
            :padding => padding, :content => content}
  end

  nil
end

# File lib/yard/templates/helpers/markup/hybrid_markdown.rb, line 500
def parse_paragraph(lines, index)
  buffer = []

  while index < lines.length
    line = lines[index]
    break if blank_line?(line)
    break if thematic_break?(line)
    break if parse_setext_heading(lines, index)
    break if parse_heading(line)
    break if fenced_code_start?(line)
    break if table_start?(lines, index)
    break if labeled_list_start?(lines, index)
    break if blockquote_start?(line)
    break if list_start?(line, true)
    break if html_block_start?(line, true)

    buffer << line.chomp
    index += 1
  end

  text = buffer.map { |line| normalize_paragraph_line(line) }.join("\n").strip
  [text.empty? ? '' : "<p>#{format_inline(text)}</p>", index]
end

# File lib/yard/templates/helpers/markup/hybrid_markdown.rb, line 1135
def parse_reference_definition(label, definition)
  definition = definition.to_s
    return nil if normalize_reference_label(label).empty?

  index = 0
  index += 1 while index < definition.length && definition[index, 1] =~ /[ \t\n]/
  return nil if index >= definition.length

  if definition[index, 1] == '<'
    close = definition.index('>', index + 1)
    return nil unless close
    url = definition[(index + 1)...close]
    return nil if url.include?("\n")
    index = close + 1
      return nil if index < definition.length && definition[index, 1] !~ /[ \t\n]/
  else
    start = index
    while index < definition.length && definition[index, 1] !~ /[ \t\n]/
      index += 1
    end
    url = definition[start...index]
  end

    return nil if url.nil? || url.include?('<') || url.include?('>')

  index += 1 while index < definition.length && definition[index, 1] =~ /[ \t\n]/
  title = nil

  if index < definition.length
    delimiter = definition[index, 1]
    close_delimiter = delimiter == '(' ? ')' : delimiter
    if delimiter == '"' || delimiter == "'" || delimiter == '('
      index += 1
      start = index
      buffer = String.new
      while index < definition.length
        char = definition[index, 1]
        if char == '\\' && index + 1 < definition.length
          buffer << definition[index, 2]
          index += 2
          next
        end
        break if char == close_delimiter
        buffer << char
        index += 1
      end
      return nil if index >= definition.length || definition[index, 1] != close_delimiter
      title = buffer
      index += 1
      index += 1 while index < definition.length && definition[index, 1] =~ /[ \t\n]/
      return nil unless index == definition.length
    else
      return nil
    end
  end

  {
    :url => escape_url(unescape_markdown_punctuation(decode_entities(url))),
    :title => title && unescape_markdown_punctuation(decode_entities(title))
  }
end

# File lib/yard/templates/helpers/markup/hybrid_markdown.rb, line 1642
def parse_reference_definition_block(lines, index, previous_line)
  line = lines[index]
  return nil unless reference_definition_context?(previous_line)

  prefix, content = split_reference_container_prefix(line)
  return nil unless content =~ /^\s{0,3}\[/

  label_buffer = content.sub(/^\s{0,3}/, '')
  consumed_lines = [line]
  label_end = find_reference_label_end(label_buffer)
  current_index = index

  while label_end.nil?
    current_index += 1
    return nil if current_index >= lines.length

    next_prefix, next_content = split_reference_container_prefix(lines[current_index])
    return nil unless next_prefix == prefix

    label_buffer << next_content
    consumed_lines << lines[current_index]
    label_end = find_reference_label_end(label_buffer)
  end

  label = label_buffer[1...label_end]
  remainder = label_buffer[(label_end + 2)..-1].to_s
  current_index += 1

  while remainder.strip.empty? && current_index < lines.length
    next_prefix, next_content = split_reference_container_prefix(lines[current_index])
    break unless next_prefix == prefix
    break if blank_line?(next_content)

    remainder << (remainder.empty? ? next_content : "\n#{next_content}")
    consumed_lines << lines[current_index]
    current_index += 1
  end

  while unclosed_reference_title?(remainder) && current_index < lines.length
    next_prefix, next_content = split_reference_container_prefix(lines[current_index])
    break unless next_prefix == prefix
    break if blank_line?(next_content)

    remainder << "\n#{next_content}"
    consumed_lines << lines[current_index]
    current_index += 1
  end

  while current_index < lines.length
    next_prefix, next_content = split_reference_container_prefix(lines[current_index])
    break unless next_prefix == prefix
    break unless reference_definition_continuation?(next_content)

    remainder << "\n#{next_content.strip}"
    consumed_lines << lines[current_index]
    current_index += 1
  end

  reference = parse_reference_definition(label, remainder)
  return nil unless reference

  {
    :label => label,
    :reference => reference,
    :replacement_lines => consumed_lines.map { |consumed| reference_definition_replacement_line(consumed, prefix) },
    :next_index => current_index
  }
end

# File lib/yard/templates/helpers/markup/hybrid_markdown.rb, line 181
def parse_setext_heading(lines, index)
  return nil if index + 1 >= lines.length
  return nil if lines[index].strip.empty?
  return nil if lines[index] =~ /^\s{0,3}>/
  return nil if parse_list_marker(lines[index])
  return nil if lines[index] =~ /^(?: {4,}|\t)/
  return nil if parse_heading(lines[index])
  return nil if fenced_code_start?(lines[index])

  content_lines = []
  current_index = index

  while current_index < lines.length
    line = lines[current_index]
    return nil if blank_line?(line)

    if line =~ SETEXT_HEADING_RE
      return nil if content_lines.empty?

      level = $1.start_with?('=') ? 1 : 2
      text = content_lines.join("\n")
      return ["<h#{level}#{heading_id(text)}>#{format_inline(text)}</h#{level}>", current_index + 1]
    end

    if current_index > index && block_boundary?(line)
      return nil
    end

    content_lines << normalize_heading_line(line)
    current_index += 1
  end

  nil
end

# File lib/yard/templates/helpers/markup/hybrid_markdown.rb, line 267
def parse_table(lines, index)
  header = split_table_row(lines[index])
  alignments = split_table_row(lines[index + 1]).map { |cell| table_alignment(cell) }
  rows = []
  index += 2

  while index < lines.length && table_row?(lines[index])
    rows << split_table_row(lines[index])
    index += 1
  end

  html = "<table>\n<thead>\n<tr>\n".dup
  header.each_with_index do |cell, i|
    attrs = alignments[i] ? %( align="#{alignments[i]}") : ""
    html << "<th#{attrs}>#{format_inline(cell)}</th>\n"
  end
  html << "</tr>\n</thead>\n<tbody>\n"
  rows.each do |row|
    html << "<tr>\n"
    row.each_with_index do |cell, i|
      attrs = alignments[i] ? %( align="#{alignments[i]}") : ""
      html << "<td#{attrs}>#{format_inline(cell)}</td>\n"
    end
    html << "</tr>\n"
  end
  html << "</tbody>\n</table>"
  [html, index]
end

# File lib/yard/templates/helpers/markup/hybrid_markdown.rb, line 1451
def parse_text_link_destination(text, index)
  return [nil, 0] unless text[index, 1] == '['

  dest = String.new
  cursor = index + 1

  while cursor < text.length
    char = text[cursor, 1]

    if char == '\\'
      escaped = text[cursor + 1, 1]
      return [nil, 0] unless escaped && "[]\\*+<_".include?(escaped)

      dest << escaped
      cursor += 2
      next
    end

    return [nil, 0] if char =~ /\s/
    return [dest, cursor - index + 1] if char == ']'
    return [nil, 0] if char == '['

    dest << char
    cursor += 1
  end

  [nil, 0]
end

# File lib/yard/templates/helpers/markup/hybrid_markdown.rb, line 253
def parse_yard_indented_code(lines, index)
  body = []

  while index < lines.length
    line = lines[index]
    break unless blank_line?(line) || indented_code_start?(line)
    body << line
    index += 1
  end

  body.pop while body.any? && blank_line?(body.last)
  [code_block(unindent(body)), index]
end

# File lib/yard/templates/helpers/markup/hybrid_markdown.rb, line 1796
def percent_encode_url(text, allowed_re)
  encoded = String.new

  each_char_compat(text.to_s) do |char|
    if ascii_only_compat?(char) && char =~ /\A#{allowed_re.source}\z/
      encoded << char
    else
      utf8_bytes(char).each do |byte|
        encoded << sprintf('%%%02X', byte)
      end
    end
  end

  encoded
end

# File lib/yard/templates/helpers/markup/hybrid_markdown.rb, line 1444
def plain_text(text)
  text = text.to_s.gsub(/!\[([^\]]*)\]\([^)]+\)/, '\1')
  text = text.gsub(/\[([^\]]+)\]\([^)]+\)/, '\1')
  text = text.gsub(/[*_~`]/, '')
  decode_entities(unescape_markdown_punctuation(text))
end

# File lib/yard/templates/helpers/markup/hybrid_markdown.rb, line 601
def protect_autolinks(text, placeholders)
  text.gsub(AUTOLINK_RE) do
    href = $1
    link_href = href.include?('@') && href !~ /\A[A-Za-z][A-Za-z0-9.+-]{1,31}:/ ? "mailto:#{href}" : escape_autolink_url(href)
    store_placeholder(placeholders, %(<a href="#{h(link_href)}">#{h(href)}</a>))
  end
end

# File lib/yard/templates/helpers/markup/hybrid_markdown.rb, line 701
def protect_braced_text_links(text, placeholders)
  output = String.new
  index = 0

  while index < text.length
    if text[index, 1] == '\\' && index + 1 < text.length
      output << text[index, 2]
      index += 2
      next
    end

    if text[index, 1] == '{'
      label_end = find_braced_text_link_label_end(text, index)
      if label_end
        label = text[(index + 1)...label_end]
        dest, consumed = parse_text_link_destination(text, label_end + 1)

        if dest
          output << store_placeholder(placeholders, link_html(label, dest))
          index = label_end + 1 + consumed
          next
        end
      end
    end

    output << text[index, 1]
    index += 1
  end

  output
end

# File lib/yard/templates/helpers/markup/hybrid_markdown.rb, line 546
def protect_code_spans(text, placeholders)
  output = String.new
  index = 0

  while index < text.length
    if text[index, 1] == '`' && (index.zero? || text[index - 1, 1] != '\\') && !inside_angle_autolink_candidate?(text, index)
      opener_length = 1
      opener_length += 1 while index + opener_length < text.length && text[index + opener_length, 1] == '`'
      closer_index = find_matching_backtick_run(text, index + opener_length, opener_length)
      if closer_index
        code = normalize_code_span(restore_placeholders(text[(index + opener_length)...closer_index], placeholders))
        output << store_placeholder(placeholders, "<code>#{h(code)}</code>")
        index = closer_index + opener_length
        next
      end

      output << ('`' * opener_length)
      index += opener_length
      next
    end

    output << text[index, 1]
    index += 1
  end

  output.gsub(/(^|[\s>])\+([^\s+\n](?:[^+\n]*?[^\s+\n])?)\+(?=$|[\s<.,;:!?)]|\z)/) do
    prefix = $1
    prefix + store_placeholder(placeholders, "<code>#{h(restore_placeholders($2, placeholders))}</code>")
  end
end

# File lib/yard/templates/helpers/markup/hybrid_markdown.rb, line 629
def protect_entities(text, placeholders)
  text.gsub(ENTITY_RE) { store_placeholder(placeholders, h(decode_entity($&))) }
end

# File lib/yard/templates/helpers/markup/hybrid_markdown.rb, line 621
def protect_escaped_characters(text, placeholders)
  text = text.gsub(RDOC_ESCAPED_CAPITALIZED_CROSSREF_RE) do
    store_placeholder(placeholders, h($1))
  end

  text.gsub(ESCAPABLE_CHARS_RE) { store_placeholder(placeholders, h($1)) }
end

# File lib/yard/templates/helpers/markup/hybrid_markdown.rb, line 633
def protect_hard_breaks(text, placeholders)
  text.gsub(/(?:\\|\s{2,})\n/) { store_placeholder(placeholders, "<br />\n") }
end

# File lib/yard/templates/helpers/markup/hybrid_markdown.rb, line 637
def protect_inline_images(text, placeholders)
  replace_inline_constructs(text, placeholders, '!') do |label, dest, title|
    store_placeholder(placeholders, image_html(
      restore_placeholders(label, placeholders),
      restore_placeholders(dest, placeholders),
      title && restore_placeholders(title, placeholders)
    ))
  end
end

# File lib/yard/templates/helpers/markup/hybrid_markdown.rb, line 647
def protect_inline_links(text, placeholders)
  replace_inline_constructs(text, placeholders, nil) do |label, dest, title|
    store_placeholder(placeholders, link_html(
      restore_placeholders(label, placeholders),
      restore_placeholders(dest, placeholders),
      title && restore_placeholders(title, placeholders)
    ))
  end
end

# File lib/yard/templates/helpers/markup/hybrid_markdown.rb, line 609
def protect_raw_html(text, placeholders)
  text.gsub(/(?<!\\)#{HTML_TAG_RE}/m) do
    match = $&
    match_start = Regexp.last_match.begin(0)
    if match_start > 0 && text[match_start - 1, 1] == '`'
      match
    else
      store_placeholder(placeholders, match)
    end
  end
end

# File lib/yard/templates/helpers/markup/hybrid_markdown.rb, line 657
def protect_reference_images(text, placeholders)
  scan_reference_constructs(text, placeholders, :image)
end

# File lib/yard/templates/helpers/markup/hybrid_markdown.rb, line 661
def protect_reference_links(text, placeholders)
  scan_reference_constructs(text, placeholders, :link)
end

# File lib/yard/templates/helpers/markup/hybrid_markdown.rb, line 665
def protect_single_word_text_links(text, placeholders)
  output = String.new
  index = 0
  bracket_depth = 0

  while index < text.length
    char = text[index, 1]

    if char == '\\' && index + 1 < text.length
      output << text[index, 2]
      index += 2
      next
    elsif char == '['
      bracket_depth += 1
    elsif char == ']' && bracket_depth > 0
      bracket_depth -= 1
    end

    if bracket_depth.zero? && (match = text[index..-1].match(/\A([A-Za-z0-9]+)(?=\[)/))
      label = match[1]
      dest, consumed = parse_text_link_destination(text, index + label.length)

      if dest
        output << store_placeholder(placeholders, link_html(label, dest))
        index += label.length + consumed
        next
      end
    end

    output << char
    index += 1
  end

  output
end

# File lib/yard/templates/helpers/markup/hybrid_markdown.rb, line 590
def protect_yard_links(text, placeholders)
  text.gsub(YARD_LINK_RE) do
    match = Regexp.last_match
    if text[match.end(0), 1] == '['
      match[0]
    else
      store_placeholder(placeholders, match[0])
    end
  end
end

# File lib/yard/templates/helpers/markup/hybrid_markdown.rb, line 1575
def punctuation_char?(char)
  return false if char.nil?

  ascii_punctuation_char?(char) || unicode_symbol_char?(char)
end

# File lib/yard/templates/helpers/markup/hybrid_markdown.rb, line 1711
def reference_definition_context?(previous_line)
  return true if previous_line.nil?
  return true if blank_line?(previous_line)

  stripped = split_reference_container_prefix(previous_line).last
  block_boundary?(stripped)
end

# File lib/yard/templates/helpers/markup/hybrid_markdown.rb, line 1520
def reference_definition_continuation?(line)
  return true if line =~ /^(?: {1,3}|\t)(.*)$/
  return true if line =~ /\A<(?:[^>\n]*)>\s*\z/
  return true if line =~ /\A(?:"[^"]*"|'[^']*'|\([^)]*\))\s*\z/

  false
end

# File lib/yard/templates/helpers/markup/hybrid_markdown.rb, line 1731
def reference_definition_replacement_line(line, prefix)
  return '' if prefix.empty?

  prefix.rstrip + "\n"
end

# File lib/yard/templates/helpers/markup/hybrid_markdown.rb, line 889
def reference_image_html(alt, ref)
  reference = @references[normalize_reference_label(ref)]
  return nil unless reference

  attrs = %( src="#{h(reference[:url])}" alt="#{h(plain_text(alt))}")
  attrs += %( title="#{h(reference[:title])}") if reference[:title]
  "<img#{attrs} />"
end

# File lib/yard/templates/helpers/markup/hybrid_markdown.rb, line 880
def reference_link_html(label, ref)
  reference = @references[normalize_reference_label(ref)]
  return nil unless reference

  attrs = %( href="#{h(reference[:url])}")
  attrs += %( title="#{h(reference[:title])}") if reference[:title]
  %(<a#{attrs}>#{format_inline(unescape_markdown_punctuation(label))}</a>)
end

# File lib/yard/templates/helpers/markup/hybrid_markdown.rb, line 1197
def replace_inline_constructs(text, placeholders, prefix)
  output = String.new
  index = 0

  while index < text.length
    if prefix
      if text[index, 2] != '![' || (index > 0 && text[index - 1, 1] == '\\')
        output << text[index, 1]
        index += 1
        next
      end
      label_start = index + 2
    else
      if text[index, 1] != '[' || (index > 0 && text[index - 1, 1] == '\\')
        output << text[index, 1]
        index += 1
        next
      end
      label_start = index + 1
    end

    label_end = find_closing_bracket(text, label_start - 1)
    unless label_end && text[label_end + 1, 1] == '('
      output << text[index, 1]
      index += 1
      next
    end

    dest, title, consumed = parse_inline_destination(text, label_end + 2, placeholders)
    unless consumed
      output << text[index, 1]
      index += 1
      next
    end

    label = text[label_start...label_end]
    if !prefix && contains_nested_link?(label, placeholders)
      output << text[index, 1]
      index += 1
      next
    end
    output << yield(label, dest, title)
    index = consumed
  end

  output
end

# File lib/yard/templates/helpers/markup/hybrid_markdown.rb, line 818
def restore_placeholders(text, placeholders)
  text.gsub(PLACEHOLDER_RE) { placeholders[$1.to_i] }
end

# File lib/yard/templates/helpers/markup/hybrid_markdown.rb, line 1122
def same_list_type?(base, other)
  return false unless other
  return base[:bullet] == other[:bullet] if !base[:ordered] && !other[:ordered]

  base[:ordered] && other[:ordered] && base[:delimiter] == other[:delimiter]
end

# File lib/yard/templates/helpers/markup/hybrid_markdown.rb, line 1879
def scan_leading_columns(text)
  index = 0
  column = 0
  source = text.to_s

  while index < source.length
    char = source[index, 1]
    if char == ' '
      column += 1
    elsif char == "\t"
      column += TAB_WIDTH - (column % TAB_WIDTH)
    else
      break
    end
    index += 1
  end

  [column, index]
end

# File lib/yard/templates/helpers/markup/hybrid_markdown.rb, line 1899
def scan_padding_columns(text, index, start_column)
  column = start_column
  padding = 0
  source = text.to_s

  while index < source.length
    char = source[index, 1]
    if char == ' '
      column += 1
      padding += 1
    elsif char == "\t"
      advance = TAB_WIDTH - (column % TAB_WIDTH)
      column += advance
      padding += advance
    else
      break
    end
    index += 1
  end

  [padding, index]
end

# File lib/yard/templates/helpers/markup/hybrid_markdown.rb, line 1245
def scan_reference_constructs(text, placeholders, kind)
  output = String.new
  index = 0

  while index < text.length
    image = kind == :image
    if image
      if text[index, 2] != '![' || (index > 0 && text[index - 1, 1] == '\\')
        output << text[index, 1]
        index += 1
        next
      end
      label_open = index + 1
    else
      if text[index, 1] != '[' || (index > 0 && text[index - 1, 1] == '\\')
        output << text[index, 1]
        index += 1
        next
      end
      label_open = index
    end

    label_close = find_closing_bracket(text, label_open)
    unless label_close
      output << text[index, 1]
      index += 1
      next
    end

    next_char = text[label_close + 1, 1]
    label = restore_placeholders(text[(label_open + 1)...label_close], placeholders)
    html = nil
    consumed = nil

    if next_char == '['
      ref_close = find_closing_bracket(text, label_close + 1)
      if ref_close
        ref = restore_placeholders(text[(label_close + 2)...ref_close], placeholders)
        ref = label if ref.empty?
        if kind == :link && contains_nested_link?(label, placeholders)
          output << text[index]
          index += 1
          next
        end
        html = kind == :image ? reference_image_html(label, ref) : reference_link_html(label, ref)
        consumed = ref_close + 1 if html
      end
    else
      if kind == :link && contains_nested_link?(label, placeholders)
        output << text[index, 1]
        index += 1
        next
      end
      html = kind == :image ? reference_image_html(label, label) : reference_link_html(label, label)
      consumed = label_close + 1 if html
    end

    if html
      output << store_placeholder(placeholders, html)
      index = consumed
    else
      output << text[index, 1]
      index += 1
    end
  end

  output
end

# File lib/yard/templates/helpers/markup/hybrid_markdown.rb, line 906
def setext_underline_line?(line)
  line =~ SETEXT_HEADING_RE
end

# File lib/yard/templates/helpers/markup/hybrid_markdown.rb, line 2020
def split_blockquote_prefix(line)
  source = line.to_s
  indent, index = scan_leading_columns(source)
  return nil if indent > 3
  return nil unless source[index, 1] == '>'

  prefix = source[0..index]
  rest = source[(index + 1)..-1].to_s
  if rest.start_with?(' ') || rest.start_with?("\t")
    prefix << rest[0, 1]
    rest = consume_columns(rest, 1, indent + 1, true)
  end

  [prefix, rest.end_with?("\n") ? rest : "#{rest}\n"]
end

# File lib/yard/templates/helpers/markup/hybrid_markdown.rb, line 1875
def split_lines(text)
  text.to_s.split(/^/, -1)
end

# File lib/yard/templates/helpers/markup/hybrid_markdown.rb, line 1719
def split_reference_container_prefix(line)
  prefix = String.new
  content = line.chomp

  while (split = split_blockquote_prefix(content))
    prefix << split[0]
    content = split[1].chomp
  end

  [prefix, content]
end

# File lib/yard/templates/helpers/markup/hybrid_markdown.rb, line 969
def split_table_row(line)
  line.strip.sub(/\A\|/, '').sub(/\|\z/, '').split('|').map(&:strip)
end

# File lib/yard/templates/helpers/markup/hybrid_markdown.rb, line 822
def store_placeholder(placeholders, html)
  placeholders << html
  "\0#{placeholders.length - 1}\0"
end

# File lib/yard/templates/helpers/markup/hybrid_markdown.rb, line 2036
def strip_blockquote_marker(line)
  split = split_blockquote_prefix(line)
  split && split[1]
end

# File lib/yard/templates/helpers/markup/hybrid_markdown.rb, line 1057
def strip_fenced_indent(line, indent)
  return line.sub(/^\t/, '') if line.start_with?("\t")

  line.sub(/\A {0,#{indent}}/, '')
end

# File lib/yard/templates/helpers/markup/hybrid_markdown.rb, line 1615
def strip_list_item_indent(line, content_indent)
  consume_columns(line, content_indent, 0, true)
end

# File lib/yard/templates/helpers/markup/hybrid_markdown.rb, line 1007
def strip_trailing_punctuation(url)
  trailer = ''
  while url =~ /[),.;:!?]\z/
    trailer = url[-1, 1] + trailer
    url = url[0...-1]
  end
  [url, trailer]
end

# File lib/yard/templates/helpers/markup/hybrid_markdown.rb, line 973
def table_alignment(cell)
  stripped = cell.strip
  return 'center' if stripped.start_with?(':') && stripped.end_with?(':')
  return 'left' if stripped.start_with?(':')
  return 'right' if stripped.end_with?(':')

  nil
end

# File lib/yard/templates/helpers/markup/hybrid_markdown.rb, line 964
def table_row?(line)
  stripped = line.strip
  stripped.include?('|') && stripped !~ /\A[|:\-\s]+\z/
end

# File lib/yard/templates/helpers/markup/hybrid_markdown.rb, line 959
def table_start?(lines, index)
  return false if index + 1 >= lines.length
  table_row?(lines[index]) && lines[index + 1] =~ TABLE_SEPARATOR_RE
end

# File lib/yard/templates/helpers/markup/hybrid_markdown.rb, line 902
def thematic_break?(line)
  line =~ THEMATIC_BREAK_RE
end

# File lib/yard/templates/helpers/markup/hybrid_markdown.rb, line 1784
def unclosed_reference_title?(text)
  stripped = text.to_s.rstrip
  return false if stripped.empty?

  single_quotes = stripped.count("'")
  double_quotes = stripped.count('"')
  open_parens = stripped.count('(')
  close_parens = stripped.count(')')

  single_quotes.odd? || double_quotes.odd? || open_parens > close_parens
end