Application: gvSIG desktop

    public class RuleRequireTokens implements Rule {

        private final String[] required_tokens;

        private String id;

        public RuleRequireTokens(String... required_token) {

            this.required_tokens = required_token;

        }

        @Override

        public RuleRequireTokens capture_as(String... ids) {

          this.id = ids[0];

          return this;

        }

        @Override

        public void parse(StatementContext context) {

            context.trace(this.toString()+".parse");

            BaseCodes args = (BaseCodes) context.getCodeBuilder().args();

            Token token = context.look_token();

            for (String required_token : this.required_tokens) {

                String token_literal = (String) token.getLiteral();

                if( !StringUtils.equals(required_token, token_literal) ) {

                    throw new ExpressionSyntaxException(

                            I18N.An_identifier_was_expected_and_XliteralX_was_found(token_literal),

                            context.getLexicalAnalyzer()

                    );

                }

                context.next_token();

                token = context.look_token();

            }

            if( this.id!=null ) {

              Code code = context.getCodeBuilder().constant(true);

              context.setCode(id, code);

            }

        }

        @Override

        public String toString() {

            return "require_tokens(" + StringUtils.join(this.required_tokens) + ")";

        }

    }

    public Rule require_tokens(String... token) {

        return new RuleRequireTokens(token);

    }

    @Override