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

/** + `autoload`: 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),
    YAP_FLAG(CALL_COUNTING_FLAG, "call_counting", true, booleanFlag, "true",
             NULL), /** + `call_counting`

                     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(ENCODING_FLAG, "encoding", true, isatom, "utf-8", getenc),
    YAP_FLAG(FILEERRORS_FLAG, "fileerrors", true, booleanFlag, "true",
             NULL), /** +  `fileerrors`

                 If `on` `fileerrors` is `on`, if `off` (default)
                 `fileerrors` is disabled.
                 */
    YAP_FLAG(LANGUAGE_MODE_FLAG, "language_mode", true, isatom, "yap",
             NULL), /** +  `language_mode`

                 wweter native mode or trying to emulate a different Prolog.
                 */
    YAP_FLAG(STACK_DUMP_ON_ERROR_FLAG, "stack_dump_on_error", true, booleanFlag,
             "true", NULL), /** +  `stack_dump_on_error `

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),
    YAP_FLAG(SYNTAX_ERRORS_FLAG, "syntax_errors", true, synerr, "error",
             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(TYPEIN_MODULE_FLAG, "typein_module", true, isatom, "user",
             typein), /** +  `typein_module `

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(USER_ERROR_FLAG, "user_error", true, stream, "user_error",
             set_error_stream), /** +  `user_error1`

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_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

    /// @}