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38 Commits

Author SHA1 Message Date
Markus Triska
17377064cf use nonterminal indicators, correct meta_predicate/1 for higher-order phrase//N 
Noted by @UWN in https://github.com/mthom/scryer-prolog/discussions/2872.

Many thanks!
 2025-06-14 22:47:29 +02:00
Aleksy Grabowski
a599a11169 Remove DCGs that have thrown an exception during term expansion 
Some DCG constructs aren't supported and can't be expanded, here we
remove offending DCG rule and don't compile it at all – in a similar
fashion to what we do when incorrect goal was found – whole predicate
isn't getting compiled.

Fixes #2675
 2024-12-22 10:37:32 +01:00
Mark Thom
f3eea6302d delay instantiation errors on lists in phrase/3 until runtime (#1665, #2396) 2024-04-29 15:28:17 -06:00
Markus Triska
795a7c690d ADDED: meta_predicate/1 declarations for (',')//2 and (;)//2 
This addresses #2366.
 2024-03-21 22:14:40 +01:00
Markus Triska
a6ccf95076 improve error context 
Source: https://github.com/mthom/scryer-prolog/issues/2304#issuecomment-1906434756
 2024-01-23 21:43:34 +01:00
Markus Triska
fe3241c07c remove checks that are now no longer needed due to representation errors 2024-01-21 10:28:19 +01:00
Markus Triska
0559ddca2a ENHANCED: Throw representation errors for DCG bodies that use unsupported constructs. 
This addresses #2285.
 2024-01-21 10:28:19 +01:00
Markus Triska
98a046500f MODIFIED: (->)/2 in DCGs is now only supported in the context of if-then-else. 
That is, ( If -> Then ; Else ) is still supported, but ( If -> Then ) not.
 2024-01-21 10:28:19 +01:00
Markus Triska
e702fe5c68 ADDED: Support for higher-order non-terminals phrase//[2,3] 
These non-terminals take a grammar rule body and additional arguments
as arguments. These arguments are appended to the first argument.

A key motivation for the introduction of these non-terminals is found
in the discussion and sample code provided by @bakaq in:

    https://github.com/mthom/scryer-prolog/discussions/2260

In this way, portable higher-order DCG programming is possible while
keeping the logical grammar rule expansion implementation dependent.

Example:

    ?- phrase(phrase('.', a, []), Cs).
       Cs = "a".
 2024-01-06 14:02:13 +01:00
Markus Triska
f2b63d1689 Prevent assertion of clauses for (-->)/2 when DCGs are enabled. 
This addresses #1508.
 2024-01-05 19:04:53 +01:00
Mark
9cd762d88a remove (\+)//1 (#1511) 2023-12-04 13:51:44 -07:00
Mark
2c76943d35 emit callable type errors from call/1 and phrase/3 when appropriate (#2202) 2023-12-04 12:20:14 -07:00
Mark Thom
6e9cd072c5 catch attribute_goals errors in copy_term/3, don't discard variable module qualifiers in dcg_body/3 (#1738) 2023-02-21 00:50:46 -07:00
Mark Thom
601ff567e3 keep phrase goal qualified even if qualifier is a variable 2023-02-17 00:20:15 -07:00
Adrián Arroyo Calle
7f177c3d03 Compatible Doclog docs for library(dcgs) 2023-01-23 21:03:11 +01:00
Markus Triska
76e33d051c rely on the built-in DCG expansion, per discussion in #1577 2022-10-26 23:36:07 -06:00
Markus Triska
47892bf24a ENHANCED: Improve determinism of ... //0 and seq//1. 
Example:

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

This addresses #1577.
 2022-10-26 23:36:07 -06:00
Mark Thom
4e6c138099 introduce expand_call_goal/3 to expand goals in control meta-predicates (#1568) 2022-10-26 23:36:07 -06:00
Mark Thom
78278c804f strip modules from GRBody in phrase/3 (#1565) 2022-10-26 23:36:07 -06:00
Mark Thom
b8f384045c fix module resolution in dcgs, call/N (#1539) 2022-10-26 23:36:07 -06:00
Mark Thom
1ffbf63d20 inline metacalls 2022-10-26 23:36:07 -06:00
Mark Thom
607c84a79b capture and propagate (=..)/2 errors in phrase/{2,3} (#1460) 2022-06-21 22:47:55 -06:00
Mark Thom
0f502fff84 compact lists of characters to partial strings in read_term_from_heap (#1452, #1453) 2022-05-03 19:12:16 -06:00
Mark Thom
e6c4ecfc10 lazily throw exceptions of dcg_body from goal-expanded phrase/{2,3} (#1244) 2022-01-22 14:55:18 -07:00
Mark Thom
8df346f377 expand phrase/{2,3} using dcg_body whenever possible 2022-01-21 08:10:55 -07:00
Mark Thom
1854338ff4 throw errors from phrase/{2,3} where expected (#1220) 2022-01-19 20:19:47 -07:00
Mark Thom
11b96875e0 streamline and fix phrase/{2,3} (#1237) 2022-01-19 20:07:15 -07:00
Mark Thom
0e2db4a23e tag DCG constructs with module names for proper resolution 2022-01-06 21:44:41 -07:00
Markus Triska
bf9654e138 ADDED: ... //0, describing an arbitrary number of elements 
This is a very versatile nonterminal. For instance, repeated elements:

    ?- phrase((...,[E],...,[E],...), "hello!!").
    %@    E = l
    %@ ;  E = !
    %@ ;  false.
 2021-07-03 09:54:01 +02:00
panasenco
02b89362b2 Replaced raw_chars//1 in library(pio) with seq//1 in library(dcgs). 2021-04-25 14:53:37 -07:00
Mark Thom
a8a82e45a0 introduce cuts over indexed (:)/2 of dcgs:phrase_/3 (#786) 2021-02-03 16:03:15 -07:00
Mark Thom
94392f248c enable phrase_ rules for module resolved grammars (#785) 2021-02-03 15:48:12 -07:00
Mark Thom
88ad2ee103 restore cut after dcg_constr check (#784) 2021-02-03 15:21:20 -07:00
Mark Thom
4e29099ed9 export loader's public predicates from builtins, handle module resolution from DCGs 2021-02-02 15:43:52 -07:00
Mark Thom
8900df6f13 add built_in to predicate_property 2021-02-02 15:03:14 -07:00
Mark Thom
a4d15bfb88 move to a predicate-based module system, move to loader.[rs|pl]-based compilation, add support for incremental clause compilation 2021-01-30 21:07:51 -07:00
Mark Thom
4f15802fbc reconcile '[]' and [] (#644), solve remaining conformity issues (#648), move (-->) from dcgs.pl to builtins.pl (#649) 2020-08-02 23:35:53 -06:00
Mark Thom
33325f1574 remove vestigial prolog/ directory (#444) 2020-06-12 18:26:38 -06:00