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haskell: Phase 14 — record update r { field = v } (parser + desugar + eval)
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Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
This commit is contained in:
giles
2026-05-07 16:43:20 +00:00
parent 9307437679
commit 76d141737a
4 changed files with 94 additions and 2 deletions
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36
lib/haskell/eval.sx
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@@ -246,6 +246,42 @@
(hk-apply
(hk-eval (nth node 1) env)
(hk-mk-thunk (nth node 2) env)))
((= tag "rec-update")
(let
((rec-val (hk-force (hk-eval (nth node 1) env)))
(updates (nth node 2)))
(let
((cname (first rec-val))
(args (rest rec-val))
(new-args (list)))
(begin
(let
((i 0))
(for-each
(fn
(a)
(let
((fname-at-i
(cond
((nil? (hk-record-field-names cname)) nil)
(:else
(nth (hk-record-field-names cname) i)))))
(let
((override
(cond
((nil? fname-at-i) nil)
(:else
(hk-find-rec-pair updates fname-at-i)))))
(begin
(append!
new-args
(cond
((nil? override) a)
(:else
(hk-mk-thunk (nth override 1) env))))
(set! i (+ i 1))))))
args))
(cons cname new-args)))))
((= tag "op")
(hk-eval-op (nth node 1) (nth node 2) (nth node 3) env))
((= tag "case") (hk-eval-case (nth node 1) (nth node 2) env))