# begin: ragel

begin

%%{

machine bel;

include 'common.rl';

action start_comment {
  trace('COMMENT start_comment')
  p_start = p;
}

action stop_comment {
  trace('COMMENT stop_comment')
  p_end = p;
}

action comment_end {
  trace('COMMENT comment_end')
  p_end = p
  chars = data[p_start...p_end]
  completed = !chars.empty?
  ast_node = comment(utf8_string(chars), complete: completed)
  @buffers[:comment] = ast_node
}

action yield_comment {
  trace('COMMENT yield_comment')
  yield @buffers[:comment] || comment(nil)
}

comment =
  SS
  ^NL+ >start_comment %stop_comment %comment_end
  ;

comment_node :=
  comment %yield_comment
  NL?
  ;

}%%

end

# end: ragel

require_relative '../ast/node' require_relative '../mixin/buffer' require_relative '../nonblocking_io_wrapper' require_relative '../tracer'

module BELParser

module Parsers
  module Expression
    module Comment

      class << self

        MAX_LENGTH = 1024 * 128 # 128K

        def parse(content)
          return nil unless content

          Parser.new(content).each do |obj|
            yield obj
          end
        end
      end

      private

      class Parser
        include Enumerable
        include BELParser::Parsers::Buffer
        include BELParser::Parsers::AST::Sexp
        include BELParser::Parsers::Tracer

        def initialize(content)
          @content = content
    # begin: ragel
          %% write data;
    # end: ragel
        end

        def each
          @buffers    = {}
          @incomplete = {}
          stack       = []
          data        = @content.unpack('C*')
          p           = 0
          p_start     = 0
          p_end       = 0
          pe          = data.length
          eof         = data.length

    # begin: ragel
          %% write init;
          %% write exec;
    # end: ragel
        end
      end
    end
  end
end

end

if __FILE__ == $0

$stdin.each_line do |line|
  BELParser::Parsers::Expression::Comment.parse(line) { |obj|
    puts obj.inspect
  }
end

end

# vim: ft=ruby ts=2 sw=2: # encoding: utf-8