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giles da27958d67 GUEST: step 4 — lib/guest/pratt.sx operator-table format + lookup

Extracted the data-half of Pratt-style precedence parsing: the operator
table format and lookup. The climbing loop stays per-language because
the two canaries use opposite conventions (lua: higher prec = tighter;
prolog: lower prec = tighter, with xfx/xfy/yfx assoc tags) — forcing
one shared loop adds callback indirection that obscures more than it
shares. The brief's literal ask is "Grammar is a dict, not hardcoded
cond" and that's what gets shared.

Entry shape: (NAME PREC ASSOC). Three accessors: pratt-op-name /
pratt-op-prec / pratt-op-assoc. One traversal: pratt-op-lookup.

Ported lua/parser.sx — replaced 18-clause cond and the
lua-binop-right? hardcoded `or` with a 15-entry lua-op-table, now
queried via pratt-op-lookup. Ported prolog/parser.sx — pl-op-find
(linear walk reimpl) deleted; pl-op-lookup wraps pratt-op-lookup;
pl-token-op simplified to return the entry directly.

Verification:
- lua/test.sh: 185/185 = baseline.
- prolog/conformance.sh: 590/590 = baseline (timestamp-only diff).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

2026-05-07 17:17:17 +00:00

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590 / 590 passing (0 failure(s)). Generated 2026-05-07T17:07:57+00:00.

Suite	Passed	Total	Status
parse	25	25	ok
unify	47	47	ok
clausedb	14	14	ok
solve	62	62	ok
operators	19	19	ok
dynamic	11	11	ok
findall	11	11	ok
term_inspect	14	14	ok
append	6	6	ok
reverse	6	6	ok
member	7	7	ok
nqueens	6	6	ok
family	10	10	ok
atoms	34	34	ok
query_api	16	16	ok
iso_predicates	29	29	ok
meta_predicates	25	25	ok
list_predicates	33	33	ok
meta_call	15	15	ok
set_predicates	15	15	ok
char_predicates	27	27	ok
io_predicates	24	24	ok
assert_rules	15	15	ok
string_agg	25	25	ok
advanced	21	21	ok
compiler	17	17	ok
cross_validate	17	17	ok
integration	20	20	ok
hs_bridge	19	19	ok

Run bash lib/prolog/conformance.sh to refresh. Override the binary with SX_SERVER=path/to/sx_server.exe bash ….

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1.1 KiB

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