Class: RedQuilt::Blockquote::Parser

Inherits:
Object
  • Object
show all
Defined in:
lib/red_quilt/blockquote.rb

Instance Method Summary collapse

Constructor Details

#initialize(block_parser) ⇒ Parser

Returns a new instance of Parser.



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# File 'lib/red_quilt/blockquote.rb', line 80

def initialize(block_parser)
  @block_parser = block_parser
  @arena = block_parser.arena
end

Instance Method Details

#parse(parent_id, lines, index) ⇒ Object 



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# File 'lib/red_quilt/blockquote.rb', line 85

def parse(parent_id, lines, index)
  # Captured before the loop: block_lines holds prefix-stripped lines,
  # whose start_byte sits after the `>`. The span must start at the
  # marker itself (excluding indent), as cmark and mdast both report.
  first_line = lines[index]
  source_start = first_line.start_byte + (Blockquote.marker_offset(first_line.content) || 0)
  block_lines = []
  paragraph_open = false

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

    if line.blank
      # Blank line outside the blockquote prefix closes it.
      break
    elsif Blockquote.match?(line.content)
      stripped = Blockquote.strip_prefix(line)
      paragraph_open =
        if stripped.content.strip.empty?
          false # `>` 単独 (or `>` followed by blank) ends any open paragraph
        else
          # Recurse through any inner blockquote prefixes — an
          # innermost open paragraph (e.g. `> > > foo` where
          # `foo` is paragraph-eligible) lets a `>`-less follow-
          # up line lazily continue it even at the outer level.
          paragraph_eligible_through_blockquotes?(stripped.content)
        end
      block_lines << stripped
    elsif paragraph_open && !@block_parser.lazy_break?(lines, index)
      # Lazy continuation: a `>`-less line is absorbed into the
      # currently open paragraph as long as it doesn't itself
      # start a new block. Only allowed while the most recent
      # in-quote line is paragraph-eligible content. The `lazy`
      # flag prevents the paragraph parser from interpreting
      # `===` / `---` on such a line as a setext underline.
      block_lines << Line.new(line.content, line.start_byte, line.end_byte, line.blank, true)
    else
      break
    end

    index += 1
  end

  block_id = @arena.add_node(NodeType::BLOCKQUOTE,
                             source_start: source_start,
                             source_len: block_lines.last.end_byte - source_start)
  @arena.append_child(parent_id, block_id)
  @block_parser.parse_lines(block_id, block_lines, transformed: true)
  index
end