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34 Commits

Author SHA1 Message Date
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