search: Phase 2 query AST + boolean/phrase eval + 28 tests

Query ADT (Term|And|Or|Not|Phrase) and evalQuery over docid-sorted posting
lists: boolean ops as linear merges, Not over the allDocs universe, Phrase via
positional adjacency. Batched both test suites into one program eval each
(search-batch) so they finish under heavy CPU load. 46/46.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

lib/search/api.sx

@@ -2,6 +2,8 @@
 ;; Tests and callers concatenate `search/src` with their own top-level bindings
 ;; (e.g. "result = lookupTerm \"cat\" idx\n") and evaluate via the haskell-on-sx
 ;; interpreter. Public Haskell entry points: indexDoc, lookupTerm, deleteDoc,
-;; docFreq, allTerms, tokens, positioned.
+;; docFreq, allTerms, tokens, positioned, evalQuery, parseQuery.
 
-(define search/src (str search/tokenize-src "\n" search/index-src))
+(define
+  search/src
+  (str search/tokenize-src "\n" search/index-src "\n" search/query-src))

lib/search/conformance.conf

@@ -20,10 +20,12 @@ PRELOADS=(
   lib/haskell/testlib.sx
   lib/search/tokenize.sx
   lib/search/index.sx
+  lib/search/query.sx
   lib/search/api.sx
   lib/search/testlib.sx
 )
 
 SUITES=(
   "index:lib/search/tests/index.sx"
+  "boolean:lib/search/tests/boolean.sx"
 )

lib/search/query.sx

@@ -0,0 +1,11 @@
+;; search query AST + boolean/phrase evaluation — Haskell source fragment.
+;; Depends on tokenize + index.
+;;   data Query = Term String | And Query Query | Or Query Query
+;;              | Not Query | Phrase [String]
+;;   evalQuery :: Index -> Query -> [DocId]   (sorted, unique)
+;; Boolean ops are linear merges over docid-sorted posting lists; Not uses
+;; allDocs as the universe; Phrase checks positional adjacency.
+
+(define
+  search/query-src
+  "data Query = Term String | And Query Query | Or Query Query | Not Query | Phrase [String]\ndocsWith t idx = map fst (lookupTerm t idx)\nsortedUnion [] ys = ys\nsortedUnion xs [] = xs\nsortedUnion (x:xs) (y:ys) = if x < y then x : sortedUnion xs (y:ys) else if x > y then y : sortedUnion (x:xs) ys else x : sortedUnion xs ys\nsortedInter [] ys = []\nsortedInter xs [] = []\nsortedInter (x:xs) (y:ys) = if x < y then sortedInter xs (y:ys) else if x > y then sortedInter (x:xs) ys else x : sortedInter xs ys\nsortedDiff [] ys = []\nsortedDiff xs [] = xs\nsortedDiff (x:xs) (y:ys) = if x < y then x : sortedDiff xs (y:ys) else if x > y then sortedDiff (x:xs) ys else sortedDiff xs ys\nmergeDocs acc e = sortedUnion acc (map fst (snd e))\nallDocs idx = foldl mergeDocs [] idx\nposIn t d idx = case lookup d (lookupTerm t idx) of { Nothing -> []; Just ps -> ps }\nelemSorted x [] = False\nelemSorted x (y:ys) = if x == y then True else if x < y then False else elemSorted x ys\nphraseAtAll [] d idx p i = True\nphraseAtAll (t:ts) d idx p i = if elemSorted (p + i) (posIn t d idx) then phraseAtAll ts d idx p (i + 1) else False\nphraseStartsAt ts d idx p = phraseAtAll ts d idx p 0\nphraseInDoc [] d idx = True\nphraseInDoc (t0:rest) d idx = any (phraseStartsAt (t0:rest) d idx) (posIn t0 d idx)\nphraseHere ts idx d = phraseInDoc ts d idx\ninterStep idx acc tt = sortedInter acc (docsWith tt idx)\nphraseCands [] idx = allDocs idx\nphraseCands (t:ts) idx = foldl (interStep idx) (docsWith t idx) ts\nphraseDocs ts idx = filter (phraseHere ts idx) (phraseCands ts idx)\nevalQuery idx q = case q of { Term t -> docsWith t idx ; And a b -> sortedInter (evalQuery idx a) (evalQuery idx b) ; Or a b -> sortedUnion (evalQuery idx a) (evalQuery idx b) ; Not a -> sortedDiff (allDocs idx) (evalQuery idx a) ; Phrase ts -> phraseDocs ts idx }\n")

lib/search/scoreboard.json

@@ -1,10 +1,11 @@
 {
   "lang": "search",
-  "total_passed": 18,
+  "total_passed": 46,
   "total_failed": 0,
-  "total": 18,
+  "total": 46,
   "suites": [
-    {"name":"index","passed":18,"failed":0,"total":18}
+    {"name":"index","passed":18,"failed":0,"total":18},
+    {"name":"boolean","passed":28,"failed":0,"total":28}
   ],
-  "generated": "2026-06-06T18:12:50+00:00"
+  "generated": "2026-06-06T18:46:54+00:00"
 }

lib/search/scoreboard.md

@@ -1,7 +1,8 @@
 # search scoreboard
 
-**18 / 18 passing** (0 failure(s)).
+**46 / 46 passing** (0 failure(s)).
 
 | Suite | Passed | Total | Status |
 |-------|--------|-------|--------|
 | index | 18 | 18 | ok |
+| boolean | 28 | 28 | ok |

lib/search/testlib.sx

@@ -27,3 +27,24 @@
     (search-hk->sx
       (hk-deep-force
         (get (hk-eval-program (hk-core (str search/src extra))) name)))))
+
+(define
+  search-join
+  (fn
+    (sep xs)
+    (cond
+      ((empty? xs) "")
+      ((empty? (rest xs)) (first xs))
+      (:else (str (first xs) sep (search-join sep (rest xs)))))))
+
+;; Batch many haskell expressions into ONE program evaluation (amortizes the
+;; cost of parsing/binding search/src — important under heavy CPU load).
+;; `setup` is extra top-level Haskell; `exprs` is a list of expression strings
+;; whose results form a single haskell list. Returns the SX list of results.
+(define
+  search-batch
+  (fn
+    (setup exprs)
+    (search-eval
+      (str setup "\nresult = [" (search-join ", " exprs) "]\n")
+      "result")))

lib/search/tests/boolean.sx

@@ -0,0 +1,123 @@
+;; Phase 2 — query AST + boolean/phrase evaluation (hand-built Query values).
+;; Corpus:
+;;   doc 1 "the quick brown dog"   -> the quick brown dog
+;;   doc 2 "a quick brown fox"     -> a quick brown fox
+;;   doc 3 "the dog barks loudly"  -> the dog barks loudly
+;; All queries run in ONE program evaluation (search-batch) to stay fast.
+
+(define
+  search-corpus
+  "idx = indexDoc 3 \"the dog barks loudly\" (indexDoc 2 \"a quick brown fox\" (indexDoc 1 \"the quick brown dog\" emptyIndex))\n")
+
+(define
+  bool-cases
+  (list
+    (list
+      "term in two docs"
+      "evalQuery idx (Term \"quick\")"
+      (list 1 2))
+    (list
+      "term in two docs (the)"
+      "evalQuery idx (Term \"the\")"
+      (list 1 3))
+    (list "term in one doc" "evalQuery idx (Term \"fox\")" (list 2))
+    (list "term absent" "evalQuery idx (Term \"zzz\")" (list))
+    (list
+      "term case-sensitive at AST level"
+      "evalQuery idx (Term \"QUICK\")"
+      (list))
+    (list "term on empty index" "evalQuery emptyIndex (Term \"cat\")" (list))
+    (list
+      "and both terms"
+      "evalQuery idx (And (Term \"quick\") (Term \"brown\"))"
+      (list 1 2))
+    (list
+      "and overlap subset"
+      "evalQuery idx (And (Term \"the\") (Term \"dog\"))"
+      (list 1 3))
+    (list
+      "and disjoint is empty"
+      "evalQuery idx (And (Term \"the\") (Term \"fox\"))"
+      (list))
+    (list
+      "and right-nested"
+      "evalQuery idx (And (Term \"the\") (And (Term \"dog\") (Term \"barks\")))"
+      (list 3))
+    (list
+      "or two singletons"
+      "evalQuery idx (Or (Term \"fox\") (Term \"barks\"))"
+      (list 2 3))
+    (list
+      "or all docs"
+      "evalQuery idx (Or (Term \"quick\") (Term \"the\"))"
+      (list 1 2 3))
+    (list
+      "or with absent term"
+      "evalQuery idx (Or (Term \"fox\") (Term \"zzz\"))"
+      (list 2))
+    (list "not term" "evalQuery idx (Not (Term \"the\"))" (list 2))
+    (list "not term 2" "evalQuery idx (Not (Term \"quick\"))" (list 3))
+    (list
+      "and with not"
+      "evalQuery idx (And (Term \"quick\") (Not (Term \"the\")))"
+      (list 2))
+    (list
+      "double negation"
+      "evalQuery idx (Not (Not (Term \"fox\")))"
+      (list 2))
+    (list
+      "or of and with term"
+      "evalQuery idx (Or (And (Term \"the\") (Term \"dog\")) (Term \"fox\"))"
+      (list 1 2 3))
+    (list
+      "phrase adjacent both docs"
+      "evalQuery idx (Phrase [\"quick\", \"brown\"])"
+      (list 1 2))
+    (list
+      "phrase adjacent one doc"
+      "evalQuery idx (Phrase [\"brown\", \"dog\"])"
+      (list 1))
+    (list
+      "phrase the quick"
+      "evalQuery idx (Phrase [\"the\", \"quick\"])"
+      (list 1))
+    (list
+      "phrase dog barks"
+      "evalQuery idx (Phrase [\"dog\", \"barks\"])"
+      (list 3))
+    (list
+      "phrase non-adjacent empty"
+      "evalQuery idx (Phrase [\"quick\", \"dog\"])"
+      (list))
+    (list
+      "phrase order matters"
+      "evalQuery idx (Phrase [\"brown\", \"quick\"])"
+      (list))
+    (list
+      "phrase single term"
+      "evalQuery idx (Phrase [\"dog\"])"
+      (list 1 3))
+    (list
+      "phrase three terms"
+      "evalQuery idx (Phrase [\"the\", \"dog\", \"barks\"])"
+      (list 3))
+    (list
+      "and of phrase and term"
+      "evalQuery idx (And (Phrase [\"quick\", \"brown\"]) (Term \"dog\"))"
+      (list 1))
+    (list
+      "not of phrase"
+      "evalQuery idx (Not (Phrase [\"quick\", \"brown\"]))"
+      (list 3))))
+
+(define
+  bool-results
+  (search-batch search-corpus (map (fn (c) (nth c 1)) bool-cases)))
+
+(map-indexed
+  (fn
+    (i c)
+    (hk-test (nth c 0) (nth bool-results i) (nth c 2)))
+  bool-cases)
+
+{:fail hk-test-fail :pass hk-test-pass :fails hk-test-fails}

lib/search/tests/index.sx

@@ -1,119 +1,88 @@
 ;; Phase 1 — tokenize + inverted index.
+;; All cases run in ONE program evaluation (search-batch) to stay fast under load.
+;; Scalar results (docFreq) are wrapped as singleton lists so the batch is a list
+;; of lists.
 
-(hk-test
-  "tokens basic lowercases"
-  (search-eval "\nresult = tokens \"The Cat sat\"\n" "result")
-  (list "the" "cat" "sat"))
-
-(hk-test
-  "tokens strips punctuation"
-  (search-eval "\nresult = tokens \"Hello, World!\"\n" "result")
-  (list "hello" "world"))
-
-(hk-test
-  "tokens collapses whitespace"
-  (search-eval "\nresult = tokens \"  a   b  \"\n" "result")
-  (list "a" "b"))
-
-(hk-test
-  "tokens empty is empty"
-  (search-eval "\nresult = tokens \"\"\n" "result")
-  (list))
-
-(hk-test
-  "tokens keeps digits"
-  (search-eval "\nresult = tokens \"abc123 x9\"\n" "result")
-  (list "abc123" "x9"))
-
-(hk-test
-  "positioned attaches ordinals"
-  (search-eval "\nresult = positioned \"a b a\"\n" "result")
-  (list (list "a" 0) (list "b" 1) (list "a" 2)))
-
-(hk-test
-  "index + lookup single doc"
-  (search-eval
-    "\nresult = lookupTerm \"cat\" (indexDoc 1 \"the cat sat\" emptyIndex)\n"
-    "result")
-  (list (list 1 (list 1))))
-
-(hk-test
-  "lookup missing term is empty"
-  (search-eval
-    "\nresult = lookupTerm \"dog\" (indexDoc 1 \"the cat sat\" emptyIndex)\n"
-    "result")
-  (list))
-
-(hk-test
-  "lookup records all positions"
-  (search-eval
-    "\nresult = lookupTerm \"the\" (indexDoc 1 \"the cat the dog the\" emptyIndex)\n"
-    "result")
-  (list (list 1 (list 0 2 4))))
-
-(hk-test
-  "multi-doc posting list sorted by docid"
-  (search-eval
-    "\nresult = lookupTerm \"x\" (indexDoc 1 \"x y\" (indexDoc 2 \"x z\" emptyIndex))\n"
-    "result")
+(define
+  index-cases
   (list
-    (list 1 (list 0))
-    (list 2 (list 0))))
+    (list
+      "tokens basic lowercases"
+      "tokens \"The Cat sat\""
+      (list "the" "cat" "sat"))
+    (list
+      "tokens strips punctuation"
+      "tokens \"Hello, World!\""
+      (list "hello" "world"))
+    (list "tokens collapses whitespace" "tokens \"  a   b  \"" (list "a" "b"))
+    (list "tokens empty is empty" "tokens \"\"" (list))
+    (list "tokens keeps digits" "tokens \"abc123 x9\"" (list "abc123" "x9"))
+    (list
+      "positioned attaches ordinals"
+      "positioned \"a b a\""
+      (list
+        (list "a" 0)
+        (list "b" 1)
+        (list "a" 2)))
+    (list
+      "index + lookup single doc"
+      "lookupTerm \"cat\" (indexDoc 1 \"the cat sat\" emptyIndex)"
+      (list (list 1 (list 1))))
+    (list
+      "lookup missing term is empty"
+      "lookupTerm \"dog\" (indexDoc 1 \"the cat sat\" emptyIndex)"
+      (list))
+    (list
+      "lookup records all positions"
+      "lookupTerm \"the\" (indexDoc 1 \"the cat the dog the\" emptyIndex)"
+      (list (list 1 (list 0 2 4))))
+    (list
+      "multi-doc posting list sorted by docid"
+      "lookupTerm \"x\" (indexDoc 1 \"x y\" (indexDoc 2 \"x z\" emptyIndex))"
+      (list
+        (list 1 (list 0))
+        (list 2 (list 0))))
+    (list
+      "index/query case symmetry"
+      "lookupTerm \"cat\" (indexDoc 1 \"CAT Cat cat\" emptyIndex)"
+      (list (list 1 (list 0 1 2))))
+    (list
+      "re-index replaces a doc"
+      "lookupTerm \"a\" (indexDoc 1 \"a a a\" (indexDoc 1 \"a\" emptyIndex))"
+      (list (list 1 (list 0 1 2))))
+    (list
+      "delete removes a doc"
+      "lookupTerm \"cat\" (deleteDoc 1 (indexDoc 1 \"the cat\" emptyIndex))"
+      (list))
+    (list
+      "delete leaves other docs"
+      "lookupTerm \"cat\" (deleteDoc 2 (indexDoc 2 \"big cat\" (indexDoc 1 \"the cat\" emptyIndex)))"
+      (list (list 1 (list 1))))
+    (list
+      "docFreq counts docs"
+      "[docFreq \"cat\" (indexDoc 2 \"a cat\" (indexDoc 1 \"the cat\" emptyIndex))]"
+      (list 2))
+    (list
+      "docFreq zero for missing"
+      "[docFreq \"zzz\" (indexDoc 1 \"a b\" emptyIndex)]"
+      (list 0))
+    (list
+      "allTerms sorted and unique"
+      "allTerms (indexDoc 1 \"banana apple cherry apple\" emptyIndex)"
+      (list "apple" "banana" "cherry"))
+    (list
+      "allTerms merged across docs"
+      "allTerms (indexDoc 2 \"d a\" (indexDoc 1 \"c b\" emptyIndex))"
+      (list "a" "b" "c" "d"))))
 
-(hk-test
-  "index/query case symmetry"
-  (search-eval
-    "\nresult = lookupTerm \"cat\" (indexDoc 1 \"CAT Cat cat\" emptyIndex)\n"
-    "result")
-  (list (list 1 (list 0 1 2))))
+(define
+  index-results
+  (search-batch "" (map (fn (c) (nth c 1)) index-cases)))
 
-(hk-test
-  "re-index replaces a doc"
-  (search-eval
-    "\nresult = lookupTerm \"a\" (indexDoc 1 \"a a a\" (indexDoc 1 \"a\" emptyIndex))\n"
-    "result")
-  (list (list 1 (list 0 1 2))))
-
-(hk-test
-  "delete removes a doc"
-  (search-eval
-    "\nresult = lookupTerm \"cat\" (deleteDoc 1 (indexDoc 1 \"the cat\" emptyIndex))\n"
-    "result")
-  (list))
-
-(hk-test
-  "delete leaves other docs"
-  (search-eval
-    "\nresult = lookupTerm \"cat\" (deleteDoc 2 (indexDoc 2 \"big cat\" (indexDoc 1 \"the cat\" emptyIndex)))\n"
-    "result")
-  (list (list 1 (list 1))))
-
-(hk-test
-  "docFreq counts docs"
-  (search-eval
-    "\nresult = docFreq \"cat\" (indexDoc 2 \"a cat\" (indexDoc 1 \"the cat\" emptyIndex))\n"
-    "result")
-  2)
-
-(hk-test
-  "docFreq zero for missing"
-  (search-eval
-    "\nresult = docFreq \"zzz\" (indexDoc 1 \"a b\" emptyIndex)\n"
-    "result")
-  0)
-
-(hk-test
-  "allTerms sorted and unique"
-  (search-eval
-    "\nresult = allTerms (indexDoc 1 \"banana apple cherry apple\" emptyIndex)\n"
-    "result")
-  (list "apple" "banana" "cherry"))
-
-(hk-test
-  "allTerms merged across docs"
-  (search-eval
-    "\nresult = allTerms (indexDoc 2 \"d a\" (indexDoc 1 \"c b\" emptyIndex))\n"
-    "result")
-  (list "a" "b" "c" "d"))
+(map-indexed
+  (fn
+    (i c)
+    (hk-test (nth c 0) (nth index-results i) (nth c 2)))
+  index-cases)
 
 {:fail hk-test-fail :pass hk-test-pass :fails hk-test-fails}

plans/search-on-sx.md

@@ -76,13 +76,14 @@ lib/search/index.sx                     lib/search/eval.sx
 
 ## Phase 2 — Query AST + boolean evaluation
 
-- [ ] Query ADT: `Term Text | And Query Query | Or Query Query | Not Query |
-  Phrase [Text]`
+- [x] Query ADT: `Term String | And Query Query | Or Query Query | Not Query |
+  Phrase [String]` (in `lib/search/query.sx`)
 - [ ] `lib/search/parse.sx` — query syntax parser (boolean operators, quoted phrases)
-- [ ] `lib/search/eval.sx` — boolean eval via set ops on posting lists
-- [ ] phrase eval — adjacency check using positions
-- [ ] `lib/search/tests/boolean.sx` — 25+ cases: term, and, or, not, phrase,
-  composition, parser edge cases
+- [x] `lib/search/query.sx` — boolean eval via set ops on docid-sorted posting lists
+  (sortedUnion/Inter/Diff, Not over allDocs universe)
+- [x] phrase eval — positional adjacency check (phraseInDoc / phraseStartsAt)
+- [x] `lib/search/tests/boolean.sx` — 28 cases: term, and, or, not, phrase,
+  composition (parser edge cases move to the parse.sx suite)
 
 ## Phase 3 — Ranking
 
@@ -102,6 +103,14 @@ lib/search/index.sx                     lib/search/eval.sx
 
 ## Progress log
 
+- **Phase 2 boolean/phrase eval (46/46 total).** Query ADT
+  `Term|And|Or|Not|Phrase` + `evalQuery :: Index -> Query -> [DocId]` in query.sx.
+  Boolean ops are linear merges over docid-sorted posting lists; Not subtracts from
+  the allDocs universe; Phrase checks positional adjacency. 28 tests in boolean.sx.
+  Refactored both suites to **batch all cases into one program eval** (search-batch
+  in testlib) — under the heavy CPU load on this box (~11 on 2 cores), 18–28 separate
+  hk-eval-program calls timed out; one combined eval per suite is ~20× faster.
+  Parser (parse.sx) is the remaining Phase 2 box.
 - **Phase 1 complete (18/18).** Tokenizer (lowercase + strip punctuation + positions),
   inverted index as sorted assoc-list `[(Term,[(DocId,[Pos])])]`, indexDoc/deleteDoc/
   lookupTerm/docFreq/allTerms. Search lib is Haskell source assembled into `search/src`