Class: PDFConverterTableBreak

Inherits:
Object
  • Object
show all
Defined in:
lib/asciidoctor-pdf-table-break.rb

Instance Method Summary collapse

Instance Method Details

#convert_table(node) ⇒ Object 



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# File 'lib/asciidoctor-pdf-table-break.rb', line 54

def convert_table node
  body_rows = node.rows[:body]

  # Save node state before any early return so the ensure block always has
  # valid references. In a prepend approach, returning early before these
  # assignments leaves them nil, and the ensure block would then corrupt the
  # node by setting body/foot to nil.
  orig_body  = node.rows[:body]
  orig_foot  = node.rows[:foot]
  orig_id    = node.id
  orig_title = node.title if node.title?
  orig_attrs = node.attributes.dup

  # Detect break rows: every cell must have source text '<<<'.
  # Covers both N+| <<< (single spanning cell) and | <<< | <<< | ... (one per column).
  break_idxs = body_rows.each_index.select do |i|
    body_rows[i].all? { |c| c.source.strip == '<<<' }
  end
  return super if break_idxs.empty?

  # Build one range per segment between break rows.
  ranges = []
  prev = 0
  break_idxs.each { |i| ranges << (prev...i); prev = i + 1 }
  ranges << (prev...body_rows.size)
  last_idx = ranges.size - 1

  # Compute the grid-line width used at break edges so borders are seamless.
  frame_widths = expand_rect_values @theme.table_border_width, 0  # [top, right, bottom, left]
  grid_raw     = @theme.table_grid_width || [frame_widths[0], frame_widths[3]]
  grid_rows_w  = (expand_grid_values grid_raw, 0)[0]
  orig_tbl_bw  = @theme.table_border_width

  ranges.each_with_index do |range, seg_idx|
    is_first = seg_idx == 0
    is_last  = seg_idx == last_idx

    advance_page unless is_first

    node.rows.body = orig_body[range]
    node.rows.foot = is_last ? orig_foot : []
    node.instance_variable_set :@attributes, orig_attrs.dup
    node.set_attr 'rowcount', node.rows[:head].size + node.rows[:body].size + node.rows[:foot].size
    node.remove_attr 'unbreakable-option'
    node.remove_attr 'breakable-option'
    node.instance_variable_set :@id,    nil unless is_first
    node.instance_variable_set :@title, nil unless is_first

    # Patch frame border widths so each segment gets the correct edge:
    #   first segment:   full frame top,  grid bottom
    #   middle segments: grid top,         grid bottom
    #   last segment:    grid top,         full frame bottom
    unless is_first && is_last
      patched = frame_widths.dup
      patched[0] = grid_rows_w unless is_first
      patched[2] = grid_rows_w unless is_last
      @theme.table_border_width = patched
    end

    begin
      super
    ensure
      @theme.table_border_width = orig_tbl_bw
    end
  end

ensure
  node.rows.body = orig_body
  node.rows.foot = orig_foot
  node.instance_variable_set :@id, orig_id
  node.instance_variable_set :@title, orig_title if defined?(orig_title) && orig_title
  node.instance_variable_set :@attributes, orig_attrs if orig_attrs
end