content: block query + TOC (query.sx) + 13 tests (574/574)

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

lib/content/tests/query.sx

@@ -0,0 +1,89 @@
+;; Extension — block query + table of contents.
+
+(st-bootstrap-classes!)
+(content/bootstrap!)
+(content-bootstrap-section!)
+
+(define
+  d
+  (doc-append
+    (doc-append
+      (doc-append
+        (doc-append (doc-empty "d") (mk-heading "h1" 1 "Intro"))
+        (mk-text "p1" "para"))
+      (mk-image "img" "/a.png" "alt"))
+    (mk-section
+      "s"
+      (list
+        (mk-heading "h2" 2 "Sub")
+        (mk-text "p2" "more")
+        (mk-image "img2" "/b.png" "b")))))
+
+;; ── select-type (tree-wide) ──
+(content-test
+  "select headings ids"
+  (map (fn (b) (blk-id b)) (content/select-type d "heading"))
+  (list "h1" "h2"))
+(content-test
+  "select images ids"
+  (map (fn (b) (blk-id b)) (content/select-type d "image"))
+  (list "img" "img2"))
+(content-test
+  "select text ids"
+  (map (fn (b) (blk-id b)) (content/select-type d "text"))
+  (list "p1" "p2"))
+(content-test
+  "select section ids"
+  (map (fn (b) (blk-id b)) (content/select-type d "section"))
+  (list "s"))
+
+;; ── count-type ──
+(content-test "count headings" (content/count-type d "heading") 2)
+(content-test "count images" (content/count-type d "image") 2)
+(content-test "count dividers" (content/count-type d "divider") 0)
+
+;; ── select with custom predicate ──
+(content-test
+  "select-ids custom"
+  (content/select-ids d (fn (b) (= (blk-type b) "image")))
+  (list "img" "img2"))
+(content-test
+  "select custom field"
+  (map
+    (fn (b) (blk-id b))
+    (content/select
+      d
+      (fn
+        (b)
+        (if
+          (= (blk-type b) "heading")
+          (= (blk-get b "level") 2)
+          false))))
+  (list "h2"))
+
+;; ── headings / TOC ──
+(content-test
+  "headings TOC"
+  (content/headings d)
+  (list {:id "h1" :text "Intro" :level 1} {:id "h2" :text "Sub" :level 2}))
+(content-test
+  "empty doc no headings"
+  (content/headings (doc-empty "e"))
+  (list))
+
+;; ── deeply nested ──
+(define
+  deep
+  (doc-append
+    (doc-empty "d")
+    (mk-section
+      "o"
+      (list (mk-section "i" (list (mk-heading "deep" 3 "Deep")))))))
+(content-test
+  "deep heading found"
+  (map (fn (b) (blk-id b)) (content/select-type deep "heading"))
+  (list "deep"))
+(content-test
+  "deep toc level"
+  (get (first (content/headings deep)) :level)
+  3)