Method: ParsingMachine#handle_run_time_capture_result

Defined in:

lib/rpeg/parsing_machine.rb

#handle_run_time_capture_result(results) ⇒ Object

From the ICloseRuntIme main-loop switch statement in lpvm.c

# File 'lib/rpeg/parsing_machine.rb', line 372

def handle_run_time_capture_result(results)
  directive, *dyn_captures = results
  unless directive
    handle_fail_ptr
    return
  end

  @subject_index = if directive == true
                     @subject_index
                   else
                     directive.must_be_a(Integer)
                     if directive < @subject_index || directive > @subject_size
                       raise 'invalid position returned by match-time capture'
                     end

                     directive
                   end

  if dyn_captures.empty?
    # no dynamic captures. Just get rid of the OPEN capture we still have
    @bread_count -= 1
  else
    # This is LPEG's adddyncaptures in lpvm.c
    @breadcrumbs[@bread_count - 1].data = nil # make the group capture an anonymous group
    dyn_captures.each do |cap_val|
      # LPEG uses a special RUNTIME capture kind here to help find these things later if they need to be removed. We don't appear
      # to need it - we could just use a CONST capture. But let's follow LPEG just in case.
      add_capture Capture::Breadcrumb.new(1, @subject_index, cap_val, Capture::RUNTIME)
    end
    add_capture Capture::Breadcrumb.new(1, @subject_index, nil, Capture::CLOSE) # close the group
  end
  @i_ptr += 1
end