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Markus Triska fe27605497 FIXED: number_chars(N, "0' "), addressing #1580. 
There may be a more elegant way to solve this.
 2023-04-02 10:04:52 +02:00
Markus Triska b87fe1e21f DOC: link to "Indexing dif/2" 2023-04-01 11:04:37 +02:00
Markus Triska d6ac125425 DOC: explain location of scryer-prolog after compilation 
This question was recently raised on the #scryer IRC channel.
 2023-04-01 11:04:37 +02:00
Markus Triska b79d8732ea use the release flag so that the instructions can be used verbatim 
Also, the location of the executable depends on this flag.
 2023-04-01 11:04:33 +02:00
Markus Triska 3df0806017 change "run" to "build", since "run" leads to a Scryer prompt which can be unexpected 2023-04-01 11:03:31 +02:00
Markus Triska 8ab1155fc5 ENHANCED: use call_residue_vars/2 to show all pending constraints 
Example:

    ?- freeze(_, false).
       freeze:freeze(_A,false).

This was originally added in 04ba9bc11a,
then reverted, and is now restored.
 2023-03-30 23:49:33 +02:00
Markus Triska 01285f12c3 remove no longer needed queue attributes after propagation 2023-03-15 21:17:06 +01:00
Markus Triska cd586aab8c show remaining queue/2 attributes as residual goals 
This lets us verify that all attributes are correctly removed earlier.
 2023-03-15 19:56:02 +01:00
Markus Triska 56bd596af3 use actual toplevel answers 2023-03-08 23:35:11 +01:00
Markus Triska 21acb9361a use string notation as discussed on #scryer IRC 2023-03-08 23:32:05 +01:00
Markus Triska c3477d8476 items --> elements 
This addresses #1740.
 2023-03-08 23:31:02 +01:00
Markus Triska 884b0ca10e FIXED: Take all variables into account during goal projection. 
This addresses #1751.
 2023-03-08 21:16:54 +01:00
Markus Triska c9ecfb11d9 ENHANCED: more compact definition of dif/2 
As outlined in #1753.
 2023-03-08 20:50:33 +01:00
Markus Triska 3dc6ed79d2 ENHANCED: must_be/2: prefer type error over instantiation error 
This addresses #1594.
 2023-02-26 22:28:18 +01:00
Markus Triska 997161c740 rely on first instantiated argument indexing 
This great improvement to indexing allows much more natural
definitions of virtually all meta-predicates. Many thanks to @notoria!
 2023-02-25 10:17:55 +01:00
Markus Triska 669242a8ce DOC: update residual goals 2023-02-23 00:10:36 +01:00
Markus Triska 2a04d5e799 in projection of residual goals, mark considered propagators as processed 
This is to avoid duplicated goals with the new projection mechanism.
 2023-02-23 00:05:27 +01:00
Markus Triska 1a01438064 add link to newly available homepage 
Many thanks to @aarroyoc for the documentation system, and for hosting the page!
 2023-02-20 20:09:47 +01:00
Markus Triska 196e9c1e47 DOC: teletype font for reification 2023-02-03 20:47:08 +01:00
Markus Triska da4c0a359b correct DocLog ~/.scryerrc rendering 2023-02-01 23:26:52 +01:00
Markus Triska 95278c221b DOC: use valid Prolog terms as predicate indicators 2023-01-29 21:48:22 +01:00
Markus Triska 814b631543 use DocLog syntax for section anchors and links within the document 2023-01-28 17:37:43 +01:00
Markus Triska 0d8c7f8785 small documentation adjustments 2023-01-28 17:37:43 +01:00
Markus Triska 5bae8fcaf8 FIXED: use lsb/2 and msb/2 from library(arithmetic) 
This addresses #1720.
 2023-01-28 17:37:43 +01:00
Markus Triska 58fb851717 correct table layout for entries that themselves contain | 2023-01-27 00:22:48 +01:00
Markus Triska 2e9ec653a8 DOC: convert library(simplex) documentation to DocLog format 2023-01-26 00:46:06 +01:00
Markus Triska 7ca782b92d DOC: convert code samples in library(lambda) to DocLog format 2023-01-26 00:40:08 +01:00
Markus Triska 996496c3f5 DOC: initial documentation for library(pairs) in DocLog format 2023-01-26 00:36:05 +01:00
Markus Triska 90cf713186 add link to Desouter et al., "Tabling as a Library with Delimited Control" 2023-01-26 00:25:26 +01:00
Markus Triska ca4aaf44de DOC: initial documentation for library(tabling) in DocLog format 2023-01-26 00:20:53 +01:00
Markus Triska b04d845ec0 DOC: convert library(pio) documentation to DocLog format 2023-01-26 00:09:41 +01:00
Markus Triska a8ea2b0f97 DOC: add documentation for library(freeze) in DocLog format 2023-01-25 23:54:30 +01:00
Markus Triska a29227d0d4 DOC: add link to "Indexing dif/2" in DocLog format 2023-01-25 23:40:55 +01:00
Markus Triska 7f8f137aa0 DOC: convert library(si) documentation to DocLog format 2023-01-25 23:27:45 +01:00
Markus Triska cc7e721611 DOC: convert library(format) documentation to DocLog format 2023-01-25 23:18:39 +01:00
Markus Triska 22b815dc5c DOC: correctly format the table using DocLog syntax 2023-01-25 22:29:14 +01:00
Markus Triska 64be8e0fba DOC: add DocLog documentation for library(debug) 2023-01-25 00:19:14 +01:00
Markus Triska 43a297b691 DOC: add DocLog documentation for library(diag) 2023-01-25 00:09:44 +01:00
Markus Triska af9f0f81d8 DOC: convert library(sgml) documentation to DocLog format 2023-01-24 22:42:58 +01:00
Markus Triska 1c08b56e05 strengthen reified division for divisor == 1 2023-01-24 22:15:05 +01:00
Markus Triska 6cb8020f62 DOC: add CLP(B) documentation in DocLog format 2023-01-24 22:15:05 +01:00
Markus Triska d742d4cde9 DOC: convert library(time) documentation to DocLog format 2023-01-24 22:14:15 +01:00
Markus Triska b7d06540e6 DOC: convert library(crypto) documentation to DocLog format 2023-01-24 22:13:38 +01:00
Markus Triska 909f2e1058 DOC: improve CLP(ℤ) DocLog documentation 2023-01-24 20:39:47 +01:00
Markus Triska f213956ceb use (#)/1 2023-01-11 17:23:53 +01:00
Markus Triska c5caa9d311 ADDED: sign/1 is now reifiable. 
This addresses #1500.
 2023-01-11 17:22:38 +01:00
Markus Triska 542b9e1976 rely on newly available operator notation for (#)/1 2023-01-10 22:59:11 +01:00
Markus Triska 73a1ee59fa replace several more instances of ?/1 by (#)/1 2023-01-10 22:57:14 +01:00
Markus Triska 2771109427 use (#)/1 already internally for describing constraint projections 2023-01-10 22:50:38 +01:00
Markus Triska cc420bd31a FIXED: reification of (xor)/2. 
Example:

    ?- A #= 1 xor 0 #<==> R.
    %@    clpz:(A#=1#<==>R), clpz:(R in 0..1).
 2023-01-10 22:09:41 +01:00
Markus Triska 2fe1d2ef53 FIXED: correctly reify (/)/2. 
Example:

    ?- 0 #==> X #= 1/2.
    %@    clpz:(X in inf..sup)
    %@ ;  false.

This addresses #1501.
 2023-01-10 17:35:43 +01:00
Markus Triska 6cb8d7596a dereference more registers, analogous to d660e4244f 
See also #1654 for a nice test case by @notoria which this corrects.
 2022-12-18 17:43:33 +01:00
Markus Triska 309e5b320e more uses of newly available deref_register(n) 2022-12-07 23:19:31 +01:00
Markus Triska 56e5da6680 introduce and use deref_register(n) 2022-12-06 21:07:50 +01:00
Markus Triska d91ee5b77c FIXED: CLP(ℤ): Correctly remove all attributes during propagation of all_distinct/1 and other global constraints. 
The constraints from library(clpz) were already correctly removed, but
others such as pending freeze/2 goals were not, potentially leading to
an accumulation of redundant constraints during propagation.

Test case:

   ?- freeze(A,(X=1;X=2)), all_distinct([A]), A = 1.
      A = 1, X = 1
   ;  A = 1, X = 2.

The combination of freeze/2 and CLP(ℤ) is useful for example when
creating animations of search processes.

This addresses #1624.
 2022-10-26 23:36:07 -06:00
Markus Triska b2cccab768 ENHANCED: library(crypto): Faster conversion to bytes when the integer is known. 
These entailed constraints only affect performance, and can be removed
without affecting the correctness of the code. They speed up scalar
multiplication of a curve point, used for example in Bitcoinolog.
 2022-10-26 23:36:07 -06:00
Markus Triska 579aa8acd4 use newly available u8s_to_string 2022-10-26 23:36:07 -06:00
Markus Triska 9c2cb144b5 remove redundant error handling, since this case is checked in Prolog 
This restores f668640e3d, where this
change was already made. It seems it was accidentally overwritten in
0404c3bd94.
 2022-10-26 23:36:07 -06:00
Markus Triska 3d04689660 introduce and use u8s_to_string 2022-10-26 23:36:07 -06:00
Markus Triska a891cc4edf use (slightly) better variable names 2022-10-26 23:36:07 -06:00
Markus Triska 706ab2ae5b use newly available must_be(chars, ...) for better and shorter type test 2022-10-26 23:36:07 -06:00
Markus Triska 9c1de8e00b ENHANCED: Eliminate the OpenSSL dependency of library(crypto). 
This is achieved by using the newly available crrl crate by @pornin
to implement crypto_curve_scalar_mult/4 for secp256k1. Many thanks!
 2022-10-26 23:36:07 -06:00
Markus Triska ce313b8a6b correct nth0/4 and nth1/4 
As per https://github.com/triska/scryer-prolog/commit/56b430ecaf9bd59fb7bd0b1e56d451ab322c422e#commitcomment-82155379.
 2022-10-26 23:36:07 -06:00
Markus Triska 7c96b91663 remove nth1/3, which is now provided by library(lists) 2022-10-26 23:36:07 -06:00
Markus Triska 87e966e185 remove nth1/3, which is now provided by library(lists) 2022-10-26 23:36:07 -06:00
Markus Triska 1e018681de ENHANCED: Much improved nth0/3, taken from #1529. 
This also adds nth0/4 and bootstraps nth1/[3,4] from it.
 2022-10-26 23:36:07 -06:00
Markus Triska 5b324680ba ADDED: must_be/can_be(not_less_than_zero, ...) 
See #1309.
 2022-10-26 23:36:07 -06:00
Markus Triska abca5fc405 better implementation of list_si/1 
Per discussion in https://github.com/mthom/scryer-prolog/pull/1589.
 2022-10-26 23:36:07 -06:00
Markus Triska 6a455d2866 ADDED: chars_si/1, testing for a string 
Examples:

    ?- chars_si("hello").
       true.

    ?- chars_si(5).
       false.

    ?- chars_si([a,b,c|Rs]).
       error(instantiation_error,sort/2).
 2022-10-26 23:36:07 -06:00
Markus Triska 70da818101 use new domain names from library(error): octet_character, octet_chars 2022-10-26 23:36:07 -06:00
Markus Triska 5ec837acb4 ADDED: octet_character and octet_chars, testing for strings that represent bytes. 2022-10-26 23:36:07 -06:00
Markus Triska 76e33d051c rely on the built-in DCG expansion, per discussion in #1577 2022-10-26 23:36:07 -06:00
Markus Triska 7c5318b784 ENHANCED: Use '$skip_max_list'/4 for greater efficiency of nth0/3. 
This is now possible due to 4c7e2eb8614da9c04f2286f6116b468017fb442c.

See #1529 for the suggestion by @UWN.
 2022-10-26 23:36:07 -06:00
Markus Triska 47892bf24a ENHANCED: Improve determinism of ... //0 and seq//1. 
Example:

    ?- phrase(..., "hello").
       true.

This addresses #1577.
 2022-10-26 23:36:07 -06:00
Markus Triska 0ab355eada use a DCG to describe the path 2022-10-26 23:36:07 -06:00
Markus Triska 44825826df remove entailed must_be/2 goals 2022-10-26 23:36:07 -06:00
Markus Triska 612f09893c use newly available ... //0 from library(dcgs) 2022-10-26 23:36:07 -06:00
Markus Triska e9f507b868 add meta_predicate/1 declaration for phrase_to_file/3 2022-10-26 23:36:07 -06:00
Markus Triska c7caf6b7a9 ENHANCED: CLP(ℤ): Reduce redundant propagator invocations during all_distinct/1 filtering 
First, the current propagator is now logged and not re-triggered
during filtering. Second, and more significantly, all neq_num/2
constraints are scheduled and processed before more global constraints
are invoked. In this way, all the distilled information can be taken
into account by subsequently invoked global constraints.

These changes yield a 3-fold improvement in several Sudoku instances,
and a significant runtime reduction in social golfer instance 8-4-9.
 2022-10-26 23:36:07 -06:00
Markus Triska 4422ffe39f add meta_predicate/1 declarations 2022-10-26 23:36:07 -06:00
Markus Triska 6b49653754 use in_character 
This addresses one aspect of #1472.
 2022-05-22 23:04:27 +02:00
Markus Triska d5fa8cc211 ADDED: must_be(in_character, ...) and can_be(in_character, ...) 2022-05-22 23:04:27 +02:00
Markus Triska 47a6b498e3 ENHANCED: "f" on toplevel to report answers up to the next multiple of 5. 
This makes counting solutions easy.
 2022-05-21 18:20:08 +02:00
Markus Triska 18c52e076f indent enumerations 2022-05-15 10:55:56 +02:00
Markus Triska 1810dabc14 clarify the representation 2022-05-15 10:55:27 +02:00
Markus Triska 609a3a229f strengthen and improve type checks 2022-05-15 10:51:00 +02:00
Markus Triska dff56643f0 clarify comment 2022-05-15 10:23:00 +02:00
Markus Triska 77f8d52271 use phrase_from_file/2 directly on the file name 2022-05-15 10:19:00 +02:00
Markus Triska 1e9821ec0c document atom and predicate completion with TAB 
This feature, added via
https://github.com/mthom/scryer-prolog/pull/1467, makes the toplevel
interaction a lot more convenient in many cases.

Many thanks to @euanlacy!
 2022-05-15 10:05:30 +02:00
Markus Triska a5e72679bc prioritize type errors over instantiation errors 
Example:

    ?- must_be(chars, [a,X,cc]).
       error(type_error(character,cc),can_be/2).

See https://github.com/mthom/scryer-prolog/pull/1474#issuecomment-1126664368
 2022-05-14 09:53:21 +02:00
Markus Triska 15cc916333 FIXED: can_be(chars, [a,X]), i.e., if variables occur as elements 
This should simplify 2f3de51e55 and
other cases like it.
 2022-05-14 08:39:20 +02:00
Markus Triska d58dd7cc91 ADDED: sign/1 2022-05-05 22:51:49 +02:00
Markus Triska 7e06abebd5 remove comment that seems no longer valid 2022-05-05 22:51:49 +02:00
Markus Triska eea83d9474 ADDED: can_be(term, ...) and must_be(term, ...) 
This terminology is a bit harder to understand than that of the other
type checks.

Scryer Prolog comprises two individually consistent but incompatible
notions of terms, namely terms and rational trees (which are also
called "cyclic terms"). This leads to a confusion in terminology,
because cyclic terms are not terms in the former sense even though
they also contain the word "term" in their name.

This terminological confusion is not restricted to terms: We also find
it for example in the notion of lists. Lists are defined inductively:

    - The empty list (written as "" or [], called 'nil') is a list.
    - A term with principal functor '.'/2 is a list if its second argument
      is a list.

Note that a list may contain cyclic terms as elements, and still be
called a list. However, if we post:

    ?- Ls = [_|Ls].

then Ls is not a list, because it does not fit the inductive
definition. Still, it is sometimes referred to as a "cyclic list" or
"circular list", even though it is not a list. Even Prolog
implementors that aim for strict conformance to the Prolog ISO
standard and are deeply familiar with the standard use this
terminology when talking about such terms, see for example:

    https://github.com/ichiban/prolog/pull/198

Consequently, must_be(list, Ls) raises a *type error* in this case.

Terms are distinguished from cyclic terms completely analogously. This
leads to the counterintuitive consequence that *cyclic lists are not
terms*. The reason for this apparent contradiction in terminology is
the mutual incompatibility of different notions of terms. The notion
of "term" precludes rational trees, similar to the notion of "list"
which precludes cyclic lists.

We therefore introduce:

    * must_be(term, Term)
      - raises an instantiation error if Term contains variables (since
        it could still become a rational tree)
      - raises a type error if Term is a rational tree

    * can_be(term, Term)
      - raises a type error if Term is a rational tree

Note that using the notion of "cyclic term" and "acyclic term" in this
terminology would not be a good idea, because this confusion is
precisely what we want to eliminate: must_be(term, Term) should be
usable as a test that reliably determines whether Term can be treated
as a term with the logical properties we expect from terms.

This addresses #1428.
 2022-04-20 22:15:32 +02:00
Markus Triska 1fa8a0a969 ENHANCED: more memory efficient call_nth/2 (#1264) 
I hope that this will allow more extensive tests of Scryer Prolog. Enjoy!
 2022-04-02 17:42:45 +02:00
Markus Triska f7e31fceac as --> is 2022-03-30 21:33:46 +02:00
Markus Triska 1a7992e524 ENHANCED: use newly available must_be(chars, ...), which is very fast 2022-03-26 19:09:54 +01:00
Markus Triska 69e52d1ed8 ENHANCED: call_nth(Goal, 0) now fails, correct error for N < 0. 
This addresses #1307.
 2022-03-07 23:38:30 +01:00
Markus Triska c6264cf098 ADDED: library(simplex), for solving linear programming problems. 2022-03-06 21:49:52 +01:00
Markus Triska 8ad4f188f2 DOC: Better explanation of strings and partial strings. 2022-03-06 11:05:31 +01:00