134 lines
6.4 KiB
C
134 lines
6.4 KiB
C
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/*************************************************************************
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* *
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* YAP Prolog *
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* *
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* Yap Prolog was developed at NCCUP - Universidade do Porto *
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* *
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* Copyright L.Damas, V.S.Costa and Universidade do Porto 2015- *
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* *
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**************************************************************************
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* *
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* File: YapLFlagInfo.h *
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* Last rev: *
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* mods: *
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* comments: local flag enumeration. *
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* *
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*************************************************************************/
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/** @file YapLFlagInfo.h
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@addtogroup YAPFlags
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@ingroup builtins
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@{
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@enum LocalFlags local Flags supported by YAP
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@brief local flag:
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*/
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typedef enum {
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/** + `autoload`: set the system to look for undefined procedures */
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YAP_FLAG( AUTOLOAD_FLAG, "autoload", true, booleanFlag, "false" , NULL ),
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/** + `read-only flag, that tells if Prolog is in an inner top-level */
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YAP_FLAG( BREAK_LEVEL_FLAG, "break_level", true, nat, "0" , NULL ),
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YAP_FLAG( CALL_COUNTING_FLAG, "call_counting", true, booleanFlag, "true" , NULL ), /** + `call_counting`
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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:
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calls: number of predicate calls since execution started or since system was reset;
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retries: number of retries for predicates called since execution started or since counters were reset;
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calls_and_retries: count both on predicate calls and retries.
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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
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stopping.
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If `on` `fileerrors` is `on`, if `off` (default)
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`fileerrors` is disabled.
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*/
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YAP_FLAG( ENCODING_FLAG, "encoding", true, isatom, "utf-8" , getenc ),
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YAP_FLAG( FILEERRORS_FLAG, "fileerrors", true, booleanFlag, "true" , NULL ), /** + `fileerrors`
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If `on` `fileerrors` is `on`, if `off` (default)
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`fileerrors` is disabled.
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*/
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YAP_FLAG( LANGUAGE_MODE_FLAG, "language_mode", true, isatom, "yap" , NULL ), /** + `language_mode`
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wweter native mode or trying to emulate a different Prolog.
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*/
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YAP_FLAG( REDEFINE_WARNINGS_FLAG, "redefine_warnings", true, booleanFlag, "true" , NULL ), /** + `redefine_warnings `
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If _Value_ is unbound, tell whether warnings for procedures defined
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in several different files are `on` or
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`off`. If _Value_ is bound to `on` enable these warnings,
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and if it is bound to `off` disable them. The default for YAP is
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`off`, unless we are in `sicstus` or `iso` mode.
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*/
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YAP_FLAG( SINGLE_VAR_WARNINGS_FLAG, "single_var_warnings", true, booleanFlag, "true" , NULL ), /** + `single_var_warnings`
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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.
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*/
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YAP_FLAG( STACK_DUMP_ON_ERROR_FLAG, "stack_dump_on_error", true, booleanFlag, "false" , NULL ), /** + `stack_dump_on_error `
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If `true` show a stack dump when YAP finds an error. The default is
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`off`.
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*/
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YAP_FLAG( STREAM_TYPE_CHECK_FLAG, "stream_type_check", true, isatom, "loose" , NULL ),
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YAP_FLAG( SYNTAX_ERRORS_FLAG, "syntax_errors", true, synerr, "error" , NULL ), /** + `syntax_errors`
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Control action to be taken after syntax errors while executing read/1,
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`read/2`, or `read_term/3`:
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+ `dec10`
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Report the syntax error and retry reading the term.
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+ `fail`
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Report the syntax error and fail.
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+ `error`
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Report the syntax error and generate an error (default).
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+ `quiet`
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Just fail
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*/
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YAP_FLAG( TYPEIN_MODULE_FLAG, "typein_module", true, isatom, "user" , typein ), /** + `typein_module `
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If bound, set the current working or type-in module to the argument,
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which must be an atom. If unbound, unify the argument with the current
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working module.
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*/
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YAP_FLAG( USER_ERROR_FLAG, "user_error", true, stream, "user_error" , set_error_stream ), /** + `user_error1`
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If the second argument is bound to a stream, set user_error to
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this stream. If the second argument is unbound, unify the argument with
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the current user_error stream.
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By default, the user_error stream is set to a stream
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corresponding to the Unix `stderr` stream.
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The next example shows how to use this flag:
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~~~{.prolog}
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?- open( '/dev/null', append, Error,
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[alias(mauri_tripa)] ).
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Error = '$stream'(3) ? ;
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no
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?- set_prolog_flag(user_error, mauri_tripa).
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close(mauri_tripa).
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yes
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?-
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~~~
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We execute three commands. First, we open a stream in write mode and
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give it an alias, in this case `mauri_tripa`. Next, we set
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user_error to the stream via the alias. Note that after we did so
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prompts from the system were redirected to the stream
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`mauri_tripa`. Last, we close the stream. At this point, YAP
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automatically redirects the user_error alias to the original
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`stderr`.
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*/
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YAP_FLAG( USER_INPUT_FLAG, "user_input", true, stream, "user_input" , set_input_stream ),
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YAP_FLAG( USER_OUTPUT_FLAG, "user_output", true, stream, "user_output" , set_output_stream ),
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} local_flag_t;
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