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yap-6.3/H/YapLFlagInfo.h
Vitor Santos Costa bdf7088665 docd
2018-05-20 00:47:27 +01:00

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/*************************************************************************
* *
* 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( REDEFINE_WARNINGS_FLAG, "redefine_warnings", true, booleanFlag, "true" , NULL ), /** + `redefine_warnings `
If _Value_ is unbound, tell whether warnings for procedures defined
in several different files are `on` or
`off`. If _Value_ is bound to `on` enable these warnings,
and if it is bound to `off` disable them. The default for YAP is
`off`, unless we are in `sicstus` or `iso` mode.
*/
YAP_FLAG( SINGLE_VAR_WARNINGS_FLAG, "single_var_warnings", true, booleanFlag, "true" , NULL ), /** + `single_var_warnings`
If `true` (default `true`) YAP checks for singleton variables when loading files. A singleton variable is a variable that appears ony once in a clause. The name must start with a capital letter, variables whose name starts with underscore are never considered singleton.
*/
YAP_FLAG( STACK_DUMP_ON_ERROR_FLAG, "stack_dump_on_error", true, booleanFlag, "false" , 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
/// @}