Module: MaRuKu::In::Markdown::BlockLevelParser

Includes:
Helpers, SpanLevelParser, Strings
Included in:
MDDocument
Defined in:
lib/maruku.rb,
lib/maruku/input/parse_doc.rb,
lib/maruku/input/linesource.rb,
lib/maruku/input/parse_block.rb

Defined Under Namespace

Classes: BlockContext, LineSource

Constant Summary

Constants included from SpanLevelParser

SpanLevelParser::CharSource, SpanLevelParser::Close_class, SpanLevelParser::EscapedCharInInlineCode, SpanLevelParser::EscapedCharInQuotes, SpanLevelParser::EscapedCharInText, SpanLevelParser::IgnoreWikiLinks, SpanLevelParser::Punct_class, SpanLevelParser::Rules

Constants included from Strings

Strings::TAB_SIZE

Instance Method Summary collapse

Methods included from SpanLevelParser

#apply_one_rule!, #educate, #extension_meta, #interpret_extension, #md_al, #merge_ial, #parse_span, #read_attribute_list, #read_em, #read_email_el, #read_emstrong, #read_footnote_ref, #read_image, #read_inline_code, #read_inline_html, #read_link, #read_quoted, #read_quoted_or_unquoted, #read_ref_id, #read_simple, #read_span, #read_strong, #read_url, #read_url_el, #read_xml_instr_span

Methods included from Helpers

#md_abbr, #md_abbr_def, #md_ald, #md_br, #md_code, #md_codeblock, #md_el, #md_em, #md_email, #md_emstrong, #md_entity, #md_foot_ref, #md_footnote, #md_header, #md_hrule, #md_html, #md_ial, #md_im_image, #md_im_link, #md_image, #md_li, #md_link, #md_par, #md_quote, #md_ref_def, #md_strong, #md_url, #md_xml_instr

Methods included from Strings

#parse_email_headers, #sanitize_ref_id, #spaces_before_first_char, #split_lines, #strip_indent, #unquote

Instance Method Details

#eventually_comes_a_def_list(src) ⇒ Object

If current line is text, a definition list is coming if 1) text,empty,*,definition



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# File 'lib/maruku/input/parse_block.rb', line 573

def eventually_comes_a_def_list(src)
  src.tell_me_the_future =~ %r{^t+e?d}x
end

#execute_code_blocks ⇒ Object 



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# File 'lib/maruku/input/parse_doc.rb', line 123

def execute_code_blocks
  each_element(:xml_instr) do |e|
    if e.target == 'maruku'
      result = safe_execute_code(e, e.code)
      if result.kind_of?(String)
        puts "Result is : #{result.inspect}"
      end
    end
  end
end

#expand_attribute_list(al, result) ⇒ Object

Expands an attribute list in an Hash



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# File 'lib/maruku/input/parse_doc.rb', line 72

def expand_attribute_list(al, result)
  al.each do |k, v|
    case k
    when :class
      if result[:class]
        result[:class] << " " << v
      else
        result[:class] = v
      end
    when :id
      result[:id] = v
    when :ref
      if self.ald[v]
        already = (result[:expanded_references] ||= [])
        if !already.include?(v)
          already << v
          expand_attribute_list(self.ald[v], result)
        else
          already << v
          maruku_error "Circular reference between labels.\n\n" +
          "Label #{v.inspect} calls itself via recursion.\nThe recursion is " +
            already.map(&:inspect).join(' => ')
        end
      else
        if result[:unresolved_references]
          result[:unresolved_references] << " " << v
        else
          result[:unresolved_references] = v
        end

        # $stderr.puts "Unresolved reference #{v.inspect} (avail: #{self.ald.keys.inspect})"
        result[v.to_sym] = true
      end
    else
      result[k.to_sym] = v
    end
  end
end

#parse_blocks(src) ⇒ Object

Input is a LineSource



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# File 'lib/maruku/input/parse_block.rb', line 26

def parse_blocks(src)
  output = BlockContext.new

  # run state machine
  while src.cur_line
    next if check_block_extensions(src, output, src.cur_line)

    md_type = src.cur_line.md_type

    # Prints detected type (useful for debugging)
    #puts "parse_blocks #{md_type}|#{src.cur_line}"
    case md_type
    when :empty
      output << :empty
      src.ignore_line
    when :ial
      m = InlineAttributeList.match src.shift_line
      content = m[1] || ""
      src2 = CharSource.new(content, src)
      interpret_extension(src2, output)
    when :ald
      output << read_ald(src)
    when :text
      # paragraph, or table, or definition list
      read_text_material(src, output)
    when :header2, :hrule
      # hrule
      src.shift_line
      output << md_hrule
    when :header3
      output << read_header3(src)
    when :ulist, :olist
      list_type = (md_type == :ulist) ? :ul : :ol
      li = read_list_item(src)
      # append to current list if we have one
      if output.last.kind_of?(MDElement) &&
          output.last.node_type == list_type then
        output.last.children << li
      else
        output << md_el(list_type, li)
      end
    when :quote
      output << read_quote(src)
    when :code
      e = read_code(src)
      output << e if e
    when :raw_html
      # More extra hacky stuff - if there's more than just HTML, we either wrap it
      # in a paragraph or break it up depending on whether it's an inline element or not
      e = read_raw_html(src)
      unless e.empty?
        if e.first.parsed_html &&
            (first_node_name = e.first.parsed_html.first_node_name) &&
            HTML_INLINE_ELEMS.include?(first_node_name) &&
            !%w(svg math).include?(first_node_name)
          content = [e.first]
          if e.size > 1
            content.concat(e[1].children)
          end
          output << md_par(content)
        else
          output.concat(e)
        end
      end
    when :footnote_text
      output << read_footnote_text(src)
    when :ref_definition
      if src.parent && src.cur_index == 0
        read_text_material(src, output)
      else
        read_ref_definition(src, output)
      end
    when :abbreviation
      output << read_abbreviation(src)
    when :xml_instr
      read_xml_instruction(src, output)
    else # warn if we forgot something
      line = src.cur_line
      maruku_error "Ignoring line '#{line}' type = #{md_type}", src
      src.shift_line
    end
  end

  merge_ial(output, src, output)
  output.delete_if {|x| x.kind_of?(MDElement) && x.node_type == :ial }

  # get rid of empty line markers
  output.delete_if {|x| x == :empty }

  # See for each list if we can omit the paragraphs
  # TODO: do this after
  output.each do |c|
    # Remove paragraphs that we can get rid of
    if [:ul, :ol].include?(c.node_type) && c.children.none?(&:want_my_paragraph)
      c.children.each do |d|
        if d.children.first && d.children.first.node_type == :paragraph
          d.children = d.children.first.children + d.children[1..-1]
        end
      end
    elsif c.node_type == :definition_list && c.children.none?(&:want_my_paragraph)
      c.children.each do |definition|
        definition.definitions.each do |dd|
          if dd.children.first.node_type == :paragraph
            dd.children = dd.children.first.children + dd.children[1..-1]
          end
        end
      end
    end
  end

  output
end

#parse_doc(s) ⇒ Object 



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# File 'lib/maruku/input/parse_doc.rb', line 6

def parse_doc(s)
  # Remove BOM if it is present
  s = s.sub(/^\xEF\xBB\xBF/u, '')
  meta2 = parse_email_headers(s)
  data = meta2.delete :data

  self.attributes.merge! meta2

=begin maruku_doc
Attribute: encoding
Scope:     document
Summary:   Encoding for the document.

If the `encoding` attribute is specified, then the content
will be converted from the specified encoding to UTF-8.
=end

  enc = self.attributes.delete(:encoding) || 'utf-8'
  if enc.downcase != 'utf-8'
    # Switch to ruby 1.9 String#encode
    # with backward 1.8 compatibility
    if data.respond_to?(:encode!)
      data.encode!('UTF-8', enc)
    else
      require 'iconv'
      data = Iconv.new('utf-8', enc).iconv(data)
    end
  end

  @children = parse_text_as_markdown(data)

  if markdown_extra?
    self.search_abbreviations
    self.substitute_markdown_inside_raw_html
  end

  self.toc = create_toc

  # use title if not set
  self.attributes[:title] ||= toc.header_element.children.join if toc.header_element

  # Now do the attributes magic
  each_element do |e|
    # default attribute list
    if default = self.ald[e.node_type.to_s]
      expand_attribute_list(default, e.attributes)
    end
    expand_attribute_list(e.al, e.attributes)
#     puts "#{e.node_type}: #{e.attributes.inspect}"
  end

=begin maruku_doc
Attribute: unsafe_features
Scope:     global
Summary:   Enables execution of XML instructions.

Disabled by default because of security concerns.
=end

  if Maruku::Globals[:unsafe_features]
    self.execute_code_blocks
    # TODO: remove executed code blocks
  end
end

#parse_text_as_markdown(text) ⇒ Object

Splits the string and calls parse_lines_as_markdown



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# File 'lib/maruku/input/parse_block.rb', line 19

def parse_text_as_markdown(text)
  lines =  split_lines(text)
  src = LineSource.new(lines)
  parse_blocks(src)
end

#read_abbreviation(src) ⇒ Object 



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# File 'lib/maruku/input/parse_block.rb', line 327

def read_abbreviation(src)
  unless (l = src.shift_line) =~ Abbreviation
    maruku_error "Bug: it's Andrea's fault. Tell him.\n#{l.inspect}"
  end

  abbr = $1
  desc = $2

  if !abbr || abbr.empty?
    maruku_error "Bad abbrev. abbr=#{abbr.inspect} desc=#{desc.inspect}"
  end

  self.abbreviations[abbr] = desc

  md_abbr_def(abbr, desc)
end

#read_ald(src) ⇒ Object 



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# File 'lib/maruku/input/parse_block.rb', line 159

def read_ald(src)
  if (l = src.shift_line) =~ AttributeDefinitionList
    id = $1
    al = read_attribute_list(CharSource.new($2, src))
    self.ald[id] = al;
    md_ald(id, al)
  else
    maruku_error "Bug Bug:\n#{l.inspect}"
    nil
  end
end

#read_code(src) ⇒ Object 



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# File 'lib/maruku/input/parse_block.rb', line 456

def read_code(src)
  # collect all indented lines
  lines = []
  while src.cur_line && [:code, :empty].include?(src.cur_line.md_type)
    lines << strip_indent(src.shift_line, 4)
  end

  #while lines.last && (lines.last.md_type == :empty )
  while lines.last && lines.last.strip.size == 0
    lines.pop
  end

  while lines.first && lines.first.strip.size == 0
    lines.shift
  end

  return nil if lines.empty?

  source = lines.join("\n")

  md_codeblock(source)
end

#read_definition(src) ⇒ Object 



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# File 'lib/maruku/input/parse_block.rb', line 577

def read_definition(src)
  # Read one or more terms
  terms = []
  while src.cur_line && src.cur_line.md_type == :text
    terms << md_el(:definition_term, parse_span(src.shift_line))
  end

  want_my_paragraph = false

  raise "Chunky Bacon!" unless src.cur_line

  # one optional empty
  if src.cur_line.md_type == :empty
    want_my_paragraph = true
    src.shift_line
  end

  raise "Chunky Bacon!" unless src.cur_line.md_type == :definition

  # Read one or more definitions
  definitions = []
  while src.cur_line && src.cur_line.md_type == :definition
    parent_offset = src.cur_index

    first = src.shift_line
    first =~ Definition
    first = $1

    lines, w_m_p = read_indented_content(src, 4, :definition, :definition)
    want_my_paragraph ||= w_m_p

    lines.unshift first

    src2 = LineSource.new(lines, src, parent_offset)
    children = parse_blocks(src2)
    definitions << md_el(:definition_data, children)
  end

  md_el(:definition, terms + definitions, {
          :terms => terms,
          :definitions => definitions,
          :want_my_paragraph => want_my_paragraph
        })
end

#read_footnote_text(src) ⇒ Object 



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# File 'lib/maruku/input/parse_block.rb', line 344

def read_footnote_text(src)
  parent_offset = src.cur_index

  first = src.shift_line

  unless first =~ FootnoteText
    maruku_error "Bug (it's Andrea's fault)"
  end

  id = $1
  text = $2 || ''

  indentation = 4 #first.size-text.size

  #   puts "id =_#{id}_; text=_#{text}_ indent=#{indentation}"

  break_list = [:footnote_text, :ref_definition, :definition, :abbreviation]
  item_type = :footnote_text
  lines, _ = read_indented_content(src, indentation, break_list, item_type)

  # add first line
  lines.unshift text unless text.strip.empty?

  src2 = LineSource.new(lines, src, parent_offset)
  children = parse_blocks(src2)

  e = md_footnote(id, children)
  self.footnotes[id] = e
  e
end

#read_header12(src) ⇒ Object

reads a header (with —– or ========)



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# File 'lib/maruku/input/parse_block.rb', line 172

def read_header12(src)
  line = src.shift_line.strip
  al = nil
  # Check if there is an IAL
  if new_meta_data? and line =~ /^(.*?)\{(.*?)\}\s*$/
    line = $1.strip
    ial = $2
    al = read_attribute_list(CharSource.new(ial, src))
  end
  text = parse_span line
  if text.empty?
    text = "{#{ial}}"
    al = nil
  end
  level = src.cur_line.md_type == :header2 ? 2 : 1;
  src.shift_line
  md_header(level, text, al)
end

#read_header3(src) ⇒ Object

reads a header like ‘#### header ####’



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# File 'lib/maruku/input/parse_block.rb', line 192

def read_header3(src)
  line = src.shift_line.strip
  al = nil
  # Check if there is an IAL
  if new_meta_data? and line =~ /^(.*?)\{(.*?)\}\s*$/
    line = $1.strip
    ial = $2
    al = read_attribute_list(CharSource.new(ial, src))
  end
  level = line[/^#+/].size
  text = parse_span line.gsub(/\A#+|#+\z/, '')
  if text.empty?
    text = "{#{ial}}"
    al = nil
  end
  md_header(level, text, al)
end

#read_indented_content(src, indentation, break_list, item_type, ial_offset = 0) ⇒ Object

This is the only ugly function in the code base. It is used to read list items, descriptions, footnote text



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# File 'lib/maruku/input/parse_block.rb', line 378

def read_indented_content(src, indentation, break_list, item_type, ial_offset=0)
  lines = []
  # collect all indented lines
  saw_empty = false
  saw_anything_after = false
  break_list = Array(break_list)
  len = indentation - ial_offset

  while src.cur_line
    num_leading_spaces = src.cur_line.number_of_leading_spaces
    break if num_leading_spaces < len && ![:text, :empty].include?(src.cur_line.md_type)

    line = strip_indent(src.cur_line, indentation)
    md_type = line.md_type

    if md_type == :empty
      saw_empty = true
      lines << line
      src.shift_line
      next
    end

    # Unquestioningly grab anything that's deeper-indented
    if md_type != :code && num_leading_spaces > len
      lines << line
      src.shift_line
      next
    end

    # after a white line
    if saw_empty
      # we expect things to be properly aligned
      break if num_leading_spaces < len
      saw_anything_after = true
    else
      break if break_list.include?(md_type)
    end

    lines << line
    src.shift_line

    # You are only required to indent the first line of
    # a child paragraph.
    if md_type == :text
      while src.cur_line && src.cur_line.md_type == :text
        lines << strip_indent(src.shift_line, indentation)
      end
    end
  end

  # TODO fix this
  want_my_paragraph = saw_anything_after ||
    (saw_empty && src.cur_line && src.cur_line.md_type == item_type)

  # create a new context

  while lines.last && lines.last.md_type == :empty
    lines.pop
  end

  return lines, want_my_paragraph
end

#read_list_item(src) ⇒ Object

Reads one list item, either ordered or unordered.



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# File 'lib/maruku/input/parse_block.rb', line 304

def read_list_item(src)
  parent_offset = src.cur_index

  item_type = src.cur_line.md_type
  first = src.shift_line

  indentation, ial = spaces_before_first_char(first)
  al = read_attribute_list(CharSource.new(ial, src)) if ial
  ial_offset = ial ? ial.length + 3 : 0
  lines, want_my_paragraph =
    read_indented_content(src, indentation, [], item_type, ial_offset)

  # add first line
  # Strip first '*', '-', '+' from first line
  stripped = first[indentation, first.size - 1]
  lines.unshift stripped

  src2 = LineSource.new(lines, src, parent_offset)
  children = parse_blocks(src2)

  md_li(children, want_my_paragraph, al)
end

#read_paragraph(src) ⇒ Object 



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# File 'lib/maruku/input/parse_block.rb', line 272

def read_paragraph(src)
  lines = [src.shift_line]
  while src.cur_line
    # :olist does not break
    case t = src.cur_line.md_type
    when :quote, :header3, :empty, :ref_definition, :ial, :xml_instr
      break
    when :olist, :ulist
      break if !src.next_line || src.next_line.md_type == t
    when :raw_html
      # This is a pretty awful hack to handle inline HTML
      # but it means double-parsing HMTL.
      html = parse_span([src.cur_line], src)
      unless html.empty? || html.first.is_a?(String)
        if html.first.parsed_html
          first_node_name = html.first.parsed_html.first_node_name
        end
      end
      break if first_node_name && !HTML_INLINE_ELEMS.include?(first_node_name)
    end
    break if src.cur_line.strip.empty?
    break if src.next_line && [:header1, :header2].include?(src.next_line.md_type)
    break if any_matching_block_extension?(src.cur_line)

    lines << src.shift_line
  end
  children = parse_span(lines, src)

  md_par(children)
end

#read_quote(src) ⇒ Object 



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# File 'lib/maruku/input/parse_block.rb', line 442

def read_quote(src)
  parent_offset = src.cur_index

  lines = []
  # collect all indented lines
  while src.cur_line && src.cur_line.md_type == :quote
    lines << unquote(src.shift_line)
  end

  src2 = LineSource.new(lines, src, parent_offset)
  children = parse_blocks(src2)
  md_quote(children)
end

#read_raw_html(src) ⇒ Object 



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# File 'lib/maruku/input/parse_block.rb', line 239

def read_raw_html(src)
  extra_line = nil
  h = HTMLHelper.new
  begin
    l = src.shift_line
    h.eat_this(l)
    #     puts "\nBLOCK:\nhtml -> #{l.inspect}"
    while src.cur_line && !h.is_finished?
      l = src.shift_line
      #       puts "html -> #{l.inspect}"
      h.eat_this "\n" + l
    end
  rescue => e
    maruku_error "Bad block-level HTML:\n#{e.inspect.gsub(/^/, '|')}\n", src
  end
  unless h.rest =~ /^\s*$/
    extra_line = h.rest
  end
  raw_html = h.stuff_you_read

  is_inline = HTML_INLINE_ELEMS.include?(h.first_tag)

  if extra_line
    remainder = is_inline ? parse_span(extra_line) : parse_text_as_markdown(extra_line)
    if extra_line.start_with?(' ')
      remainder[0] = ' ' + remainder[0] if remainder[0].is_a?(String)
    end
    is_inline ? [md_html(raw_html), md_par(remainder)] : [md_html(raw_html)] + remainder
  else
    [md_html(raw_html)]
  end
end

#read_ref_definition(src, out) ⇒ Object 



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# File 'lib/maruku/input/parse_block.rb', line 479

def read_ref_definition(src, out)
  line = src.shift_line

  # if link is incomplete, shift next line
  if src.cur_line &&
      ![:footnote_text, :ref_definition, :definition, :abbreviation].include?(src.cur_line.md_type) &&
      (1..3).include?(src.cur_line.number_of_leading_spaces)
    line << " " << src.shift_line
  end

  match = LinkRegex.match(line)
  unless match
    maruku_error "Link does not respect format: '#{line}'" and return
  end

  id = match[1]
  url = match[2]
  title = match[3] || match[4] || match[5]
  id = sanitize_ref_id(id)

  hash = self.refs[id] = {
    :url => url,
    :title => title
  }

  stuff = (match[6] || '')
  stuff.split.each do |couple|
    k, v = couple.split('=')
    v ||= ""
    v = v[1..-2] if v.start_with?('"') # strip quotes
    hash[k.to_sym] = v
  end

  out << md_ref_def(id, url, :title => title)
end

#read_table(src) ⇒ Object 



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# File 'lib/maruku/input/parse_block.rb', line 519

def read_table(src)
  head = split_cells(src.shift_line).map do |s|
    md_el(:head_cell, parse_span(s))
  end

  separator = split_cells(src.shift_line)

  align = separator.map do |s|
    # ex: :-------------------:
    # If the separator starts and ends with a colon,
    # center the cell. If it's on the right, right-align,
    # otherwise left-align.
    starts = s.start_with? ':'
    ends = s.end_with? ':'
    if starts && ends
      :center
    elsif ends
      :right
    else
      :left
    end
  end

  num_columns = align.size

  if head.size != num_columns
    maruku_error "Table head does not have #{num_columns} columns: \n#{head.inspect}"
    tell_user "I will ignore this table."
    # XXX try to recover
    return md_br
  end

  rows = []

  while src.cur_line && src.cur_line =~ /\|/
    row = split_cells(src.shift_line).map do |s|
      md_el(:cell, parse_span(s))
    end

    if head.size != num_columns
      maruku_error  "Row does not have #{num_columns} columns: \n#{row.inspect}"
      tell_user "I will ignore this table."
      # XXX try to recover
      return md_br
    end
    rows << row
  end

  children = (head + rows).flatten
  md_el(:table, children, { :align => align })
end

#read_text_material(src, output) ⇒ Object 



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# File 'lib/maruku/input/parse_block.rb', line 139

def read_text_material(src, output)
  if src.cur_line.include?('|') && # if contains a pipe, it could be a table header
      src.next_line &&
      src.next_line.rstrip =~ TableSeparator
    output << read_table(src)
  elsif src.next_line && [:header1, :header2].include?(src.next_line.md_type)
    output << read_header12(src)
  elsif eventually_comes_a_def_list(src)
    definition = read_definition(src)
    if output.last.kind_of?(MDElement) &&
        output.last.node_type == :definition_list then
      output.last.children << definition
    else
      output << md_el(:definition_list, definition)
    end
  else # Start of a paragraph
    output << read_paragraph(src)
  end
end

#read_xml_instruction(src, output) ⇒ Object 



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# File 'lib/maruku/input/parse_block.rb', line 210

def read_xml_instruction(src, output)
  m = /^\s*<\?((\w+)\s*)?(.*)$/.match src.shift_line
  raise "BugBug" unless m
  target = m[2] || ''
  code = m[3]
  until code.include?('?>')
    code << "\n" << src.shift_line
  end
  unless code =~ /\?>\s*$/
    garbage = (/\?>(.*)$/.match(code))[1]
    maruku_error "Trailing garbage on last line: #{garbage.inspect}:\n" +
      code.gsub(/^/, '|'), src
  end
  code.gsub!(/\?>\s*$/, '')

  if target == 'mrk' && MaRuKu::Globals[:unsafe_features]
    result = safe_execute_code(self, code)
    if result
      if result.kind_of? String
        raise "Not expected"
      else
        output.push(*result)
      end
    end
  else
    output << md_xml_instr(target, code)
  end
end

#safe_execute_code(object, code) ⇒ Object 



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# File 'lib/maruku/input/parse_doc.rb', line 111

def safe_execute_code(object, code)
  begin
    object.instance_eval(code)
  rescue StandardError, ScriptError => e
    maruku_error "Exception while executing this:\n" +
      code.gsub(/^/, ">") +
      "\nThe error was:\n" +
      (e.inspect + "\n" + e.caller.join("\n")).gsub(/^/, "|")
    nil
  end
end

#search_abbreviations ⇒ Object 



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# File 'lib/maruku/input/parse_doc.rb', line 134

def search_abbreviations
  abbreviations.each do |abbrev, title|
    reg = Regexp.new(Regexp.escape(abbrev))
    replace_each_string do |s|
      # bug if many abbreviations are present (agorf)
      p = StringScanner.new(s)
      a = []
      until p.eos?
        o = ''
        o << p.getch until p.scan(reg) or p.eos?
        a << o unless o.empty?
        a << md_abbr(abbrev.dup, title ? title.dup : nil) if p.matched == abbrev
      end
      a
    end
  end
end

#split_cells(s) ⇒ Object 



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# File 'lib/maruku/input/parse_block.rb', line 515

def split_cells(s)
  s.split('|').reject(&:empty?).map(&:strip)
end

#substitute_markdown_inside_raw_html ⇒ Object

(PHP Markdown extra) Search for elements that have markdown=1 or markdown=block defined



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# File 'lib/maruku/input/parse_doc.rb', line 154

def substitute_markdown_inside_raw_html
  each_element(:raw_html) do |e|
    html = e.parsed_html
    next unless html

    html.process_markdown_inside_elements(self)
  end
end