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Plans for acl-on-sx (Datalog), flow-on-sx (Scheme), feed-on-sx (APL), mod-on-sx (Prolog), search-on-sx (Haskell). Each is a 4-phase queue sitting on its respective guest language, targeting rose-ash needs: access control, durable workflows, activity feeds, moderation, search. Federation extension in Phase 4 of each (plugs into fed-sx). Briefings for the three loops we're kicking off now: acl-loop, flow-loop, feed-loop. mod-sx and search-sx briefings will follow once the first three have surfaced any shared infrastructure worth extracting to lib/guest/. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
107 lines
4.6 KiB
Markdown
107 lines
4.6 KiB
Markdown
# search-on-sx: Full-text + structured search on Haskell
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rose-ash needs search across pages, posts, threads, federated content. Tokenize,
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index, query, rank, filter by visibility. Typed ADTs make query parsing clean,
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lazy lists make posting-list iteration efficient, and Haskell-on-SX is at 1514/1514.
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End-state: a Haskell-on-SX layer with inverted index, query AST, boolean +
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phrase + ranked queries (TF-IDF, BM25), ACL-aware post-filter, and a federation
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extension that merges per-peer indices.
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## Status (rolling)
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`bash lib/search/conformance.sh` → **0/0** (not yet started)
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## Ground rules
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- **Scope:** only touch `lib/search/**` and `plans/search-on-sx.md`. Do **not** edit
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`spec/`, `hosts/`, `shared/`, `lib/haskell/**`, or other `lib/<lang>/`. You may
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**import** from `lib/haskell/` (public API in `lib/haskell/haskell.sx`); do **not**
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modify Haskell.
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- **Shared-file issues** go under "Blockers" with a minimal repro; do not fix here.
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- **SX files:** use `sx-tree` MCP tools only.
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- **Architecture:** index = `Map Term [(DocId, [Pos])]`. Query AST = ADT. Eval =
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fold of posting lists with set ops + ranking math. Ranking is pure (no IO until
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result emission).
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- **Commits:** one feature per commit. Keep Progress log updated and tick boxes.
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## Architecture sketch
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```
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Document Query
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{:id :text :tags} "alice AND bob OR phrase \"x y\""
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│ │
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▼ ▼
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lib/search/tokenize.sx lib/search/parse.sx
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— tokenize :: Text → [Term] — parse :: Text → Query
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— normalize (lowercase, strip) — Query = Term | And | Or
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— (optionally) stem | Not | Phrase
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│ │
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▼ ▼
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lib/search/index.sx lib/search/eval.sx
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— Map Term [(DocId, [Pos])] — eval :: Index → Query → [DocId]
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— insert / delete / lookup — boolean + phrase positions
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— persistence (optional later) │
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│ ▼
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└────────────────► lib/search/rank.sx
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— TF-IDF / BM25 scoring
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— top-N
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│
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▼
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lib/search/api.sx
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— (search/index doc)
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— (search/query q)
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— (search/top n q)
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│
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▼
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lib/search/fed.sx
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— federated query (merge peer results)
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— ACL filter post-merge
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```
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## Phase 1 — Tokenize + index
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- [ ] `lib/search/tokenize.sx` — normalize (lowercase, strip punctuation), split on
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whitespace, return positions
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- [ ] `lib/search/index.sx` — inverted index data structure (typed `Map` from
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haskell lib); `insert`, `delete`, `lookup`
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- [ ] `lib/search/api.sx` — `(search/index doc)`, `(search/lookup term)`
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- [ ] `lib/search/tests/index.sx` — 15+ cases: tokenize, insert + lookup, update,
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delete, multi-doc
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- [ ] `lib/search/scoreboard.{json,md}`
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- [ ] `lib/search/conformance.sh`
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## Phase 2 — Query AST + boolean evaluation
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- [ ] Query ADT: `Term Text | And Query Query | Or Query Query | Not Query |
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Phrase [Text]`
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- [ ] `lib/search/parse.sx` — query syntax parser (boolean operators, quoted phrases)
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- [ ] `lib/search/eval.sx` — boolean eval via set ops on posting lists
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- [ ] phrase eval — adjacency check using positions
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- [ ] `lib/search/tests/boolean.sx` — 25+ cases: term, and, or, not, phrase,
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composition, parser edge cases
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## Phase 3 — Ranking
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- [ ] document frequency tracking — extend index with `df` per term
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- [ ] TF-IDF scoring
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- [ ] BM25 scoring (configurable k1, b)
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- [ ] top-N retrieval (heap-based)
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- [ ] `lib/search/tests/rank.sx` — 20+ cases: TF-IDF behavior, BM25 vs TF-IDF,
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ranking stability, top-N correctness
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## Phase 4 — ACL filter + federation
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- [ ] post-filter — each candidate result tested via `(acl/permit? viewer :read doc)`
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- [ ] federated query — fan out to peer instances via fed-sx, merge results
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- [ ] merge policy — interleave by rank, dedupe by `(peer, doc-id)`
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- [ ] `lib/search/tests/integration.sx` — federated search with ACL filter
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## Progress log
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(loop fills this in)
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## Blockers
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(loop fills this in)
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