11.2.12 Hook Predicates

user:breakpoint_expansion(+Macro, -Body)   hook,development

defines debugger condition macros

user:debugger_command_hook(+DCommand,-Actions)   hook,development

Allows the interactive debugger to be extended with user-defined commands.

user:error_exception(=Exception)   hook

Exception is an exception that traps to the debugger if it is switched on.

user:file_search_path(+F,-D)   hook

directory D is included in file search path F

foreign(+F,-P)

foreign(+F,-L,-P)

Describes the interface between Prolog and the foreign Routine

foreign_resource(+R,-L)

resource R defines foreign functions in list L

user:generate_message_hook(+M,?S0,?S)   hook

A way for the user to override the call to 'SU_messages':generate_message/3 in print_message/2.

goal_expansion(+Term1, +Layout1, +Module, -Term2, -Layout2)   hook

Defines transformations on goals while clauses are being compiled or asserted, and during meta-calls.

user:library_directory(-D)   hook

D is a library directory that will be searched

user:message_hook(+S,+M,+L)   hook

Overrides the call to print_message_lines/3 in print_message/2.

user:portray(+T)

A way for the user to over-ride the default behavior of print/1.

user:portray_message(+S,+M)   hook

Tells print_message/2 what to do.

user:query_hook(+QueryClass, +Query, +QueryLines, +Help, +HelpLines, -Answer)   hook

Called by ask_query/4 before processing the query. If this predicate succeeds, it is assumed that the query has been processed and nothing further is done.

user:query_class_hook(+QueryClass, -Prompt, -InputMethod, -MapMethod, -FailureMode)   hook

Provides the user with a method of overriding the call to 'SU_messages':query_class/5 in the preparation phase of query processing. This way the default query class characteristics can be changed.

user:query_input_hook(+InputMethod, +Prompt, -RawInput)   hook

Provides the user with a method of overriding the call to 'SU_messages':query_input/3 in the input phase of query processing. This way the implementation of the default input methods can be changed.

user:query_map_hook(+MapMethod, +RawInput, -Result, -Answer)   hook

Provides the user with a method of overriding the call to 'SU_messages':query_map/4 in the mapping phase of query processing. This way the implementation of the default map methods can be changed.

user:runtime_entry(+M)   hook

This predicate is called upon start-up and exit of stand alone applications.

user:term_expansion(+Term1, +Layout1, +Tokens1, -Term2, -Layout2, -Tokens2)   hook

Overrides or complements the standard transformations to be done by expand_term/2.

user:unknown_predicate_handler(+G,+M,-N)   hook

hook to trap calls to unknown predicates