# begin: ragel

begin

%%{

machine bel;

include 'term.rl';
include 'relationship.rl';
include 'comment.rl';

action statement_subject {
  trace('SIMPLE_STATEMENT statement_subject')
  @buffers[:subject]    = subject(
                            @buffers[:term_stack][-1])
  @buffers[:term_stack] = nil
}

action statement_object {
  trace('SIMPLE_STATEMENT statement_object')
  term = @buffers[:term_stack][-1]
  @buffers[:object] = object(term)
  @buffers[:term_stack] = nil
  sub = @buffers[:subject]
  rel = @buffers[:relationship]
  obj = @buffers[:object]
  stmt = statement(sub, rel, obj)
  simple_stmt = simple_statement(stmt)
  simple_stmt.complete = true
  @buffers[:simple_statement] = simple_stmt
}

action simple_statement_comment {
  trace('SIMPLE_STATEMENT simple_statement_comment')
  comment = @buffers[:comment]
  @buffers[:simple_statement] =
    simple_statement(
      @buffers[:simple_statement].statement << comment)
}

action yield_simple_statement {
  trace('YIELD_SIMPLE_STATEMENT')
  simple_stmt = @buffers.delete(:simple_statement)
  yield simple_stmt
}

STATEMENT_SIMPLE =
  outer_term %statement_subject
  SP+
  relationship %relationship_end
  SP+
  outer_term
  %statement_object;

simple_statement :=
  STATEMENT_SIMPLE
  SP*
  comment? %simple_statement_comment %yield_simple_statement
  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 SimpleStatement

      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
          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::SimpleStatement.parse(line) { |obj|
    puts obj.inspect
  }
end

end

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