Class: Coradoc::Markdown::Parser::InlineParser

Inherits:
Parslet::Parser
  • Object
show all
Defined in:
lib/coradoc/markdown/parser/inline_parser.rb

Instance Method Summary collapse

Instance Method Details

#build_delim_stack(tree) ⇒ Object 



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# File 'lib/coradoc/markdown/parser/inline_parser.rb', line 183

def build_delim_stack(tree)
  delim_stack = []
  tree.each_with_index do |elem, idx|
    next unless elem.is_a?(Hash) || elem.length != 1

    key = elem.first.first
    if %i[rsp rpp rfp].include?(key)
      outer_key = key
      tree[idx] = elem = elem[key]
      key = elem.first.first
    end
    next unless %i[bfdr lfdr rfdr nfdr].include?(key)

    delim_stack << idx
    # pp elem
    elem[:char] = elem[key].to_s[0]
    elem[:length] = elem[key].length
    elem[:left_flanking] = %i[bfdr lfdr].include?(key)
    elem[:right_flanking] = %i[bfdr rfdr].include?(key)
    elem[:preceded_by_punc] = %i[rsp rpp].include?(outer_key)
    elem[:followed_by_punc] = %i[rsp rfp].include?(outer_key)
    # elem[:active] = true
  end
  # pp delim_stack
  delim_stack
end

#can_close_emphasis(elem) ⇒ Object 



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# File 'lib/coradoc/markdown/parser/inline_parser.rb', line 156

def can_close_emphasis(elem)
  return false unless elem[:right_flanking]
  return true unless elem[:char] == '_'

  !elem[:left_flanking] || (elem[:left_flanking] && elem[:followed_by_punc])
end

#can_open_emphasis(elem) ⇒ Object 



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# File 'lib/coradoc/markdown/parser/inline_parser.rb', line 149

def can_open_emphasis(elem)
  return false unless elem[:left_flanking]
  return true unless elem[:char] == '_'

  !elem[:right_flanking] || (elem[:right_flanking] && elem[:preceded_by_punc])
end

#lookup_entity(s) ⇒ Object 



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# File 'lib/coradoc/markdown/parser/inline_parser.rb', line 35

def lookup_entity(s)
  HTML_ENTITIES[s.to_s] || "&#{s};"
end

#parse(io, options = {}) ⇒ Object 



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# File 'lib/coradoc/markdown/parser/inline_parser.rb', line 268

def parse(io, options = {})
  process_emphasis(super(io, options))
end

#process_code(s) ⇒ Object 



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# File 'lib/coradoc/markdown/parser/inline_parser.rb', line 39

def process_code(s)
  s = s.to_s
  s.tr!("\n", ' ')
  return s.slice(1, s.length - 2) if s.length > 2 && s.start_with?(' ') && s.end_with?(' ')

  s
end

#process_emphasis(tree) ⇒ Object 



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# File 'lib/coradoc/markdown/parser/inline_parser.rb', line 210

def process_emphasis(tree)
  delim_stack = build_delim_stack(tree)
  cur_pos = 0
  openers_bottom = { '*' => 0, '_' => 0 }
  while (closer_offset = delim_stack[cur_pos..].index { |i| can_close_emphasis(tree[i]) })
    # puts "-----"
    # pp tree
    # puts "clofset #{closer_offset} -> cur_pos #{closer_offset + cur_pos}"
    cur_pos += closer_offset
    closer = tree[closer_idx = delim_stack[cur_pos]]
    # puts "closer:#{cur_pos}, #{closer}"
    # look back - in reverse?
    opener_bottom = openers_bottom[closer[:char]]
    opener_to_cur = delim_stack.slice(opener_bottom, cur_pos - opener_bottom)
    # puts "obottom #{opener_bottom} len #{cur_pos - opener_bottom} -> opener_to_cur #{opener_to_cur}"
    opener_offset = (opener_to_cur || []).rindex do |i|
      can_open_emphasis(tree[i]) && tree[i][:char] == closer[:char] && rule_of_three(tree[i], closer)
    end
    # puts "opener:#{opener_offset}"
    if opener_offset
      opener = tree[opener_idx = delim_stack[opener_bottom + opener_offset]]
      strong = opener[:length] > 1 && closer[:length] > 1
      # pp opener
      contents_range = (opener_idx + 1)..(closer_idx - 1)
      # puts "crange #{contents_range} size #{contents_range.size}"
      contents = used_delims_to_text(tree.slice!(contents_range))
      tree.insert(opener_idx + 1, { (strong ? :strong : :emph) => contents })
      middle = (opener_bottom + opener_offset + 1)..(cur_pos - 1)
      delim_stack.slice!(middle)
      # puts "slice middle #{middle} -> #{delim_stack}"
      delim_stack.map! { |i| i <= opener_idx ? i : (i - contents_range.size + 1) }
      # puts "slice map <dstack.map!> #{delim_stack}"
      cur_pos -= middle.size
      if (opener[:length] -= strong ? 2 : 1).zero?
        delim_stack.slice!(opener_bottom + opener_offset)
        cur_pos -= 1
        # puts "slice opener #{opener_bottom + opener_offset} -> #{delim_stack} @#{cur_pos}"
      end
      if (closer[:length] -= strong ? 2 : 1).zero?
        delim_stack.slice!(cur_pos)
        # puts "slice closer #{cur_pos} -> #{delim_stack}"
      end
    else
      openers_bottom[closer[:chr]] = cur_pos - 1
      if can_open_emphasis(closer)
        cur_pos += 1
      else
        delim_stack.slice!(cur_pos)
        # puts "nopener slice #{cur_pos} -> #{delim_stack}"
      end
    end
  end
  # puts "----------"
  used_delims_to_text(tree)
  # puts "----------"
  # pp x
end

#rule_of_three(opener, closer) ⇒ Object 



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# File 'lib/coradoc/markdown/parser/inline_parser.rb', line 163

def rule_of_three(opener, closer)
  return true unless (can_open_emphasis(opener) && can_close_emphasis(opener)) ||
                     (can_open_emphasis(closer) && can_close_emphasis(closer))

  ((opener[:length] % 3).zero? && (closer[:length] % 3).zero?) ||
    (opener[:length] + closer[:length]) % 3 != 0
end

#unicode_codepoint(base, s) ⇒ Object 



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# File 'lib/coradoc/markdown/parser/inline_parser.rb', line 18

def unicode_codepoint(base, s)
  i = s.to_s.to_i(base)
  return "\uFFFD" if i.zero?

  i.chr(Encoding::UTF_8)
rescue RangeError
  "\uFFFD"
end

#unicode_dec(s) ⇒ Object 



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# File 'lib/coradoc/markdown/parser/inline_parser.rb', line 27

def unicode_dec(s)
  unicode_codepoint(10, s)
end

#unicode_hex(s) ⇒ Object 



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# File 'lib/coradoc/markdown/parser/inline_parser.rb', line 31

def unicode_hex(s)
  unicode_codepoint(16, s)
end

#used_delims_to_text(elems) ⇒ Object 



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# File 'lib/coradoc/markdown/parser/inline_parser.rb', line 171

def used_delims_to_text(elems)
  elems.map do |elem|
    if elem.key?(:char)
      next if elem[:length] < 1

      { text: elem[:char] * elem[:length] }
    else
      elem
    end
  end.compact
end