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search: result pagination (offset/limit) + 12 tests
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paginate windows a ranked list (take lim . drop off); pageTfIdf/pageBm25 and
resultCount. 148/148.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
This commit is contained in:
giles
2026-06-06 20:55:25 +00:00
parent 9d3b775b25
commit 3ab8270a58
7 changed files with 84 additions and 8 deletions
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lib/search/page.sx Normal file
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;; search pagination — Haskell source fragment. Depends on rank.
;; Windows a ranked result list by offset/limit (offset >= length -> empty;
;; limit clamps to what remains).
;; paginate :: Int -> Int -> [DocId] -> [DocId] (offset, limit)
;; pageTfIdf :: Int -> Int -> [Term] -> Index -> [DocId]
;; pageBm25 :: Int -> Int -> Float -> Float -> [Term] -> Index -> [DocId]
;; resultCount :: [Term] -> Index -> Int
(define
search/page-src
"paginate off lim docs = take lim (drop off docs)\npageTfIdf off lim ts idx = paginate off lim (rankTfIdf ts idx)\npageBm25 off lim k1 b ts idx = paginate off lim (rankBm25 k1 b ts idx)\nresultCount ts idx = length (rankTfIdf ts idx)\n")