This module defines several predicates from the Quintus Prolog libraries. Note that our library structure is totally different. If this library were complete, Prolog code could be ported by removing the use_module/1 declarations, relying on the SWI-Prolog autoloader.
Bluffers guide to porting:
- Fix problems
Of course, this library is incomplete ...
- interface to Unix.
- For (A -> B ; otherwise -> C)
- abs(+Number, -Absolute)
- Unify `Absolute' with the absolute value of `Number'.
- sin(+Angle, -Sine) is det
- cos(+Angle, -Cosine) is det
- tan(+Angle, -Tangent) is det
- log(+X, -NatLog) is det
- log10(+X, -Log) is det
- Math library predicates. SWI-Prolog (and ISO) support these as functions under is/2, etc.
- genarg(?Index, +Term, ?Arg) is nondet
- Generalised version of ISO arg/3. SWI-Prolog's arg/3 is already genarg/3.
- prolog_flag(?Flag, ?Value) is nondet
- Same as ISO current_prolog_flag/2. Maps
- date(-Date) is det
- Get current date as
- no_style_check(Style) is det
- Same as SWI-Prolog
style_check(-Style). The Quintus option
single_varis mapped to
- mode(+ModeDecl) is det
- Ignore a DEC10/Quintus
:- mode(Head)declaration. Typically these declarations are written in operator form. The operator declaration is not part of the Quintus emulation library. The following declaration is compatible with Quintus:
:- op(1150, fx, [(mode)]).
- simple(@Term) is semidet
- Term is atomic or a variable.
- current_stream(?Object, ?Mode, ?Stream)
- SICStus/Quintus and backward compatible predicate. New code should be using the ISO compatible stream_property/2.
- stream_position(+Stream, -Old, +New)
- True when Old is the current position in Stream and the stream has been repositioned to New.
- skip_line is det
- skip_line(Stream) is det
- Skip the rest of the current line (on Stream). Same as
- compile(+Files) is det
- Compile files. SWI-Prolog doesn't distinguish between compilation and consult.
- atom_char(+Char, -Code) is det
- atom_char(-Char, +Code) is det
- Same as ISO char_code/2.
- midstring(?ABC, ?B, ?AC) is nondet
- midstring(?ABC, ?B, ?AC, LenA) is nondet
- midstring(?ABC, ?B, ?AC, LenA, LenB) is nondet
- midstring(?ABC, ?B, ?AC, LenA, LenB, LenC) is nondet
- Too difficult to explain. See the Quintus docs. As far as I understand them the code below emulates this function just fine.
- Quintus compatible exception handling
- on_exception(+Template, :Goal, :Recover)
The following predicates are exported, but not or incorrectly documented.