yap-6.3/H/YapLFlagInfo.h

/*************************************************************************
 *									 *
 *	 YAP Prolog 							 *
 *									 *
 *	Yap Prolog was developed at NCCUP - Universidade do Porto	 *
 *									 *
 * Copyright L.Damas, V.S.Costa and Universidade do Porto 2015-		 *
 *									 *
 **************************************************************************
 *									 *
 * File:		YapLFlagInfo.h * Last rev:
 ** mods: * comments:	local flag enumeration.				 *
 *									 *
 *************************************************************************/

/** @file YapLFlagInfo.h

    @addtogroup YAPFlags
@ingroup builtins
@{


    @enum THREAD_LOCAL_FLAGS  Local Flags supported by YAP
    @brief local flags and their values.
*/

START_LOCAL_FLAGS

/**< Allow constructs such as 'Functor( V )'. Functor is parsed as an
   atom. The token `V` is still understood as a variable.

Originally a SWI-Prolog flag.
 */
YAP_FLAG(ALLOW_VARIABLE_NAME_AS_FUNCTOR_FLAG, "allow_variable_name_as_functor", true, booleanFlag, "false", NULL),

/**< set the system to look for undefined procedures */
YAP_FLAG(AUTOLOAD_FLAG, "autoload", true, booleanFlag, "false", NULL),

/**<`read-only flag, that tells if Prolog is in an inner top-level */
    YAP_FLAG(BREAK_LEVEL_FLAG, "break_level", true, nat, "0", NULL),

 /**<
                     Predicates compiled with this flag set maintain a counter
               on the numbers of proceduree calls and of retries. These counters
               are  decreasing counters, and they can be used as timers. Three
               counters are available:

                     calls: number of predicate calls since execution started or
               since system was reset; retries: number of retries for predicates
               called since execution started or since counters were reset;
                     calls_and_retries: count both on predicate calls and
               retries. These counters can be used to find out how many calls a
               certain goal takes to execute. They can also be force the
               computatiom yp stopping.

               If `on` `fileerrors` is `on`, if `off` (default)
               `fileerrors` is disabled.
               */
  YAP_FLAG(CALL_COUNTING_FLAG, "call_counting", true, booleanFlag, "true",
             NULL),

/**< Indicates YAP is running within the compiler. */
  YAP_FLAG(COMPILING_FLAG, "compiling", false, booleanFlag,
             "true", NULL),
/**< support for coding systens, YAP relies on UTF-8 internally.
 */
    YAP_FLAG(ENCODING_FLAG, "encoding", true, isatom, "utf-8", getenc),

/** + what to do if opening a file fails.

 */
  YAP_FLAG(FILEERRORS_FLAG, "fileerrors", true, booleanFlag, "true",
             NULL),

              /**<

                 whether native mode or trying to emulate a different
                 Prolog.
                 */
  YAP_FLAG(LANGUAGE_MODE_FLAG, "language_mode", true, isatom, "yap",
             NULL),
  /**< If true, quoted atoms, string, lists of codes and of chars may extend over several lines, without the need to escape the new-line characters. Otherwise, unquoted line breaks cause a syntax error.

 The default was for it to be true, except if in iso mode. YAP-6.5 changed the default, in order to ensure compatibility.                                                                       
  */
  YAP_FLAG(MULTILINE_QUOTED_TEXT_FLAG, "multiline_quoted_text", false, booleanFlag, "false",              NULL),
/**< Show the execution stack in exceptions. */
  YAP_FLAG(STACK_DUMP_ON_ERROR_FLAG, "stack_dump_on_error", false, booleanFlag,
             "true", NULL),
             /**<

        If `true` show a stack dump when YAP finds an error. The default is
        `off`.
        */
        YAP_FLAG(STREAM_TYPE_CHECK_FLAG, "stream_type_check", true, isatom, "loose",
             NULL),
             /** +  `syntax_errors`

Control action to be taken after syntax errors while executing read/1,
`read/2`, or `read_term/3`:
+ `dec10`
Report the syntax error and retry reading the term.
+ `fail`
Report the syntax error and fail.
+ `error`
Report the syntax error and generate an error (default).
+ `quiet`
Just fail
*/
  YAP_FLAG(SYNTAX_ERRORS_FLAG, "syntax_errors", true, synerr, "error",
	   NULL),
/**<
   If bound, set the current working or type-in module to the argument,
   which must be an atom. If unbound, unify the argument with the current
   working module.
   
*/
  YAP_FLAG(TYPEIN_MODULE_FLAG, "typein_module", true, isatom, "user",
             typein),




/**<

    If `normal` allow printing of informational and banner messages,
    such as the ones that are printed when consulting. If `silent`
    disable printing these messages. It is `normal` by default except if
    YAP is booted with the `-q` or `-L` flag.

 */
	YAP_FLAG(VERBOSE_FLAG, "verbose", true, isatom, "normal", NULL),

	/**<

       If `true` allow printing of informational messages when
       searching for file names. If `false` disable printing these
       messages. It is `false` by default except if YAP is booted with
       the `-L` flag.
    */
	YAP_FLAG(VERBOSE_FILE_SEARCH_FLAG, "verbose_file_search", true, booleanFlag,
			 "false", NULL),

	/**<

        If `true` allow printing of informational messages when
        consulting files. If `false` disable printing these messages. It
        is `true` by default except if YAP is booted with the `-L`
        flag.
     */
  YAP_FLAG(VERBOSE_LOAD_FLAG, "verbose_load", true, booleanFlag, "true", NULL),
/**<

  If the second argument is bound to a stream, set user_error to
  this stream. If the second argument is unbound, unify the argument with
  the current user_error stream.
  By default, the user_error stream is set to a stream
  corresponding to the Unix `stderr` stream.
  The next example shows how to use this flag:

  ~~~{.prolog}
  ?- open( '/dev/null', append, Error,
  [alias(mauri_tripa)] ).

  Error = '$stream'(3) ? ;

  no
  ?- set_prolog_flag(user_error, mauri_tripa).

  close(mauri_tripa).

  yes
  ?-
  ~~~
  We execute three commands. First, we open a stream in write mode and
  give it an alias, in this case `mauri_tripa`. Next, we set
  user_error to the stream via the alias. Note that after we did so
  prompts from the system were redirected to the stream
  `mauri_tripa`. Last, we close the stream. At this point, YAP
  automatically redirects the user_error alias to the original
  `stderr`.
  */
  YAP_FLAG(USER_ERROR_FLAG, "user_error", true, stream, "user_error",
	   set_error_stream),
  YAP_FLAG(USER_INPUT_FLAG, "user_input", true, stream, "user_input",
	   set_input_stream),
  YAP_FLAG(USER_OUTPUT_FLAG, "user_output", true, stream, "user_output",
	   set_output_stream),
  
    END_LOCAL_FLAGS

    /// @}