Class: Kramdown::Parser::PotMarkdown

Inherits:
GFM
  • Object
show all
Defined in:
lib/kramdown/parser/pot_markdown.rb,
lib/kramdown/parser/pot_markdown/table.rb,
lib/kramdown/parser/pot_markdown/atx_header.rb,
lib/kramdown/parser/pot_markdown/code_block.rb

Constant Summary collapse

TABLE_SEP_LINE = 
/^([+|: -]*?-[+|: -]*?)[ \t]*\n/
TABLE_HSEP_ALIGN = 
/[ ]?(:?)-+(:?)[ ]?/
TABLE_FSEP_LINE = 
/^[+|: =]*?=[+|: =]*?[ \t]*\n/
TABLE_ROW_LINE = 
/^(.*?)[ \t]*\n/
TABLE_PIPE_CHECK = 
/(?:^\|)/
TABLE_LINE = 
/#{TABLE_PIPE_CHECK}.*?\|\s*\n/
TABLE_START = 
/^#{OPT_SPACE}(?=\S)#{TABLE_LINE}/
FENCED_CODEBLOCK_MATCH = 
/^(([~`]){3,})\s*?((\w[\w\:\.-]*)(?:\?\S*)?)?\s*?\n(.*?)^\1\2*\s*?\n/m

Instance Method Summary collapse

Constructor Details

#initialize(source, options) ⇒ PotMarkdown

Returns a new instance of PotMarkdown.



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# File 'lib/kramdown/parser/pot_markdown.rb', line 7

def initialize(source, options)
  super

  # replace table
  @block_parsers.insert(@block_parsers.index(:table), :table_pot)
  @block_parsers.delete(:table)
end

Instance Method Details

#parse_atx_header ⇒ Object 



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# File 'lib/kramdown/parser/pot_markdown/atx_header.rb', line 4

def parse_atx_header
  # ↓ removed in pot_markdown
  # return false if !after_block_boundary?

  start_line_number = @src.current_line_number
  @src.check(ATX_HEADER_MATCH)
  level = @src[1]
  text = @src[2].to_s.strip
  id = @src[3]
  return false if text.empty?

  @src.pos += @src.matched_size
  el = new_block_el(:header, nil, nil, level: level.length, raw_text: text, location: start_line_number)
  add_text(text, el)
  el.attr['id'] = id if id
  @tree.children << el
  true
end

#parse_codeblock_fenced ⇒ Object 



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# File 'lib/kramdown/parser/pot_markdown/code_block.rb', line 6

def parse_codeblock_fenced
  if @src.check(self.class::FENCED_CODEBLOCK_MATCH)
    start_line_number = @src.current_line_number
    @src.pos += @src.matched_size
    el = new_block_el(:codeblock, @src[5], nil, location: start_line_number)
    lang = @src[3].to_s.strip
    unless lang.empty?
      lang, filename = lang.split(':', 2)
      if filename.nil? && lang.include?('.')
        filename = lang
        lang = Rouge::Lexer.guess_by_filename(filename).name.match(/[^\:]+\z/).to_s.downcase
      end
      el.options[:lang] = lang
      el.attr['data-lang'] = lang
      if filename
        el.attr['class'] = "language-#{lang} has-filename"
        el.attr['data-filename'] = filename
      else
        el.attr['class'] = "language-#{lang}"
      end
    end
    @tree.children << el
    true
  else
    false
  end
end

#parse_table_pot ⇒ Object 



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# File 'lib/kramdown/parser/pot_markdown/table.rb', line 12

def parse_table_pot
  return false unless after_block_boundary?

  saved_pos = @src.save_pos
  orig_pos = @src.pos
  table = new_block_el(:table, nil, nil, alignment: [], location: @src.current_line_number)
  leading_pipe = (@src.check(TABLE_LINE) =~ /^\s*\|/)
  @src.scan(TABLE_SEP_LINE)

  rows = []
  has_footer = false
  columns = 0

  add_container = lambda do |type, force|
    if !has_footer || type != :tbody || force
      cont = Element.new(type)
      cont.children = rows
      rows = []
      table.children << cont
    end
  end

  until @src.eos?
    break unless @src.check(TABLE_LINE)
    if @src.scan(TABLE_SEP_LINE)
      if rows.empty?
        # nothing to do, ignoring multiple consecutive separator lines
      elsif table.options[:alignment].empty? && !has_footer
        add_container.call(:thead, false)
        table.options[:alignment] = @src[1].scan(TABLE_HSEP_ALIGN).map do |left, right|
          (left.empty? && right.empty? && :default) || (right.empty? && :left) || (left.empty? && :right) || :center
        end
      else # treat as normal separator line
        add_container.call(:tbody, false)
      end
    elsif @src.scan(TABLE_FSEP_LINE)
      add_container.call(:tbody, true) unless rows.empty?
      has_footer = true
    elsif @src.scan(TABLE_ROW_LINE)
      trow = Element.new(:tr)

      # parse possible code spans on the line and correctly split the line into cells
      env = save_env
      cells = []
      @src[1].split(/(<code.*?>.*?<\/code>)/).each_with_index do |str, i|
        if i.odd?
          (cells.empty? ? cells : cells.last) << str
        else
          reset_env(src: Kramdown::Utils::StringScanner.new(str, @src.current_line_number))
          root = Element.new(:root)
          parse_spans(root, nil, [:codespan])

          root.children.each do |c|
            if c.type == :raw_text
              # Only on Ruby 1.9: f, *l = c.value.split(/(?<!\\)\|/).map {|t| t.gsub(/\\\|/, '|')}
              f, *l = c.value.split(/\\\|/, -1).map { |t| t.split(/\|/, -1) }.inject([]) do |memo, t|
                memo.last << "|#{t.shift}" if memo.size > 0
                memo.concat(t)
              end
              (cells.empty? ? cells : cells.last) << f
              cells.concat(l)
            else
              delim = (c.value.scan(/`+/).max || '') + '`'
              tmp = "#{delim}#{' ' if delim.size > 1}#{c.value}#{' ' if delim.size > 1}#{delim}"
              (cells.empty? ? cells : cells.last) << tmp
            end
          end
        end
      end
      restore_env(env)

      cells.shift if leading_pipe && cells.first.strip.empty?
      cells.pop if cells.last.strip.empty?
      cells.each do |cell_text|
        tcell = Element.new(:td)
        tcell.children << Element.new(:raw_text, cell_text.strip)
        trow.children << tcell
      end
      columns = [columns, cells.length].max
      rows << trow
    else
      break
    end
  end

  unless before_block_boundary?
    @src.revert_pos(saved_pos)
    return false
  end

  # Parse all lines of the table with the code span parser
  env = save_env
  l_src = ::Kramdown::Utils::StringScanner.new(extract_string(orig_pos...(@src.pos - 1), @src),
                                               @src.current_line_number)
  reset_env(src: l_src)
  root = Element.new(:root)
  parse_spans(root, nil, [:codespan, :span_html])
  restore_env(env)

  # Check if each line has at least one unescaped pipe that is not inside a code span/code
  # HTML element
  # Note: It doesn't matter that we parse *all* span HTML elements because the row splitting
  # algorithm above only takes <code> elements into account!
  pipe_on_line = false
  while (c = root.children.shift)
    lines = c.value.split(/\n/)
    if c.type == :codespan
      if lines.size > 2 || (lines.size == 2 && !pipe_on_line)
        break
      elsif lines.size == 2 && pipe_on_line
        pipe_on_line = false
      end
    else
      break if lines.size > 1 && !pipe_on_line && lines.first !~ /^#{TABLE_PIPE_CHECK}/
      pipe_on_line = (lines.size > 1 ? false : pipe_on_line) || (lines.last =~ /^#{TABLE_PIPE_CHECK}/)
    end
  end
  @src.revert_pos(saved_pos) && (return false) unless pipe_on_line

  add_container.call(has_footer ? :tfoot : :tbody, false) unless rows.empty?

  unless table.children.any? { |el| el.type == :tbody }
    warning("Found table without body on line #{table.options[:location]} - ignoring it")
    @src.revert_pos(saved_pos)
    return false
  end

  # adjust all table rows to have equal number of columns, same for alignment defs
  table.children.each do |kind|
    kind.children.each do |row|
      (columns - row.children.length).times do
        row.children << Element.new(:td)
      end
    end
  end
  if table.options[:alignment].length > columns
    table.options[:alignment] = table.options[:alignment][0...columns]
  else
    table.options[:alignment] += [:default] * (columns - table.options[:alignment].length)
  end

  @tree.children << table

  true
end