Modul Preprocessor

Jan Burse, erstellt 21. Mai 2019
/**
* Simulation of some SWI-Prolog conditional compilation.
*
* Warranty & Liability
* To the extent permitted by applicable law and unless explicitly
* otherwise agreed upon, XLOG Technologies GmbH makes no warranties
* regarding the provided information. XLOG Technologies GmbH assumes
* no liability that any problems might be solved with the information
* provided by XLOG Technologies GmbH.
*
* Rights & License
* All industrial property rights regarding the information - copyright
* and patent rights in particular - are the sole property of XLOG
* Technologies GmbH. If the company was not the originator of some
* excerpts, XLOG Technologies GmbH has at least obtained the right to
* reproduce, change and translate the information.
*
* Reproduction is restricted to the whole unaltered document. Reproduction
* of the information is only allowed for non-commercial uses. Selling,
* giving away or letting of the execution of the library is prohibited.
* The library can be distributed as part of your applications and libraries
* for execution provided this comment remains unchanged.
*
* Restrictions
* Only to be distributed with programs that add significant and primary
* functionality to the library. Not to be distributed with additional
* software intended to replace any components of the library.
*
* Trademarks
* Jekejeke is a registered trademark of XLOG Technologies GmbH.
*/
:- module(preprocessor, []).
% sys_stack(-List)
:- private sys_stack/1.
:- thread_local sys_stack/1.
:- private sys_push_stack/1.
assertz(sys_stacK([C|L])).
% sys_peek_stack
:- private sys_peek_stack/0.
sys_stack([off|_]).
% sys_pop_stack
:- private sys_pop_stack/0.
retract(sys_stack([_,X|L])), !,
assertz(sys_stack([X|L])).
throw(error(syntax_error(unbalanced_directive),_)).
% user:term_expansion(+Term, -Term)
:- public user:term_expansion/2.
:- multifile user:term_expansion/2.
:- meta_predicate user:term_expansion(-1,-1).
user:term_expansion((:- if(C)), unit) :- !,
; C
user:term_expansion((:- elif(C)), unit) :- !,
-> D = off
; D = off, C
user:term_expansion((:- else), unit) :- !,
-> D = off
; D = off

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