Move SSD cell JSON helpers to typed Kotlin

ober

12d73611877dd525a3db6f51f6f421f966b272be

diff --git a/.build.yml b/.build.yml
index 088ca19..03caea2 100644
--- a/.build.yml
+++ b/.build.yml
@@ -5,7 +5,7 @@ packages:
   - make=4.4.1-r4
 sources:
   # Build dependency: full immutable commit, mirrored in dependencies.lock.json.
-  - "https://git.sr.ht/~lisp/jerboa#063dc728b171b6039887edb42acecd201f5dd3f0"
+  - "https://git.sr.ht/~lisp/jerboa#778d80053579958c2297c6f183517fdf1db94950"
   # The second source is the build subject selected by the SourceHut submitter.
   - https://git.sr.ht/~lisp/jerboa-android
 tasks:
@@ -14,6 +14,6 @@ tasks:
       test "$(apk info -v chez-scheme)" = chez-scheme-10.3.0-r2
       test "$(apk info -v git)" = git-2.54.0-r0
       test "$(apk info -v make)" = make-4.4.1-r4
-      test "$(git -C ../jerboa rev-parse HEAD)" = 063dc728b171b6039887edb42acecd201f5dd3f0
-      test "$(git -C ../jerboa rev-parse 'HEAD^{tree}')" = 08e730fabd0754a09c6b50b072823385540bc627
+      test "$(git -C ../jerboa rev-parse HEAD)" = 778d80053579958c2297c6f183517fdf1db94950
+      test "$(git -C ../jerboa rev-parse 'HEAD^{tree}')" = d643e4a71c3d517cc14732ff7e7b87fe578b014b
       JERBOA="chez --libdirs .:../jerboa/lib --script" make test
diff --git a/dependencies.lock.json b/dependencies.lock.json
index bdc7390..cceec91 100644
--- a/dependencies.lock.json
+++ b/dependencies.lock.json
@@ -11,8 +11,8 @@
   "generator_runtime": {
     "name": "jerboa",
     "repository": "https://git.sr.ht/~lisp/jerboa",
-    "commit": "063dc728b171b6039887edb42acecd201f5dd3f0",
-    "tree": "08e730fabd0754a09c6b50b072823385540bc627"
+    "commit": "778d80053579958c2297c6f183517fdf1db94950",
+    "tree": "d643e4a71c3d517cc14732ff7e7b87fe578b014b"
   },
   "assurance_tools": {
     "osv_scanner": {
diff --git a/scripts/verify-supply-chain.sh b/scripts/verify-supply-chain.sh
index 36bc170..9cdcbdf 100755
--- a/scripts/verify-supply-chain.sh
+++ b/scripts/verify-supply-chain.sh
@@ -3,8 +3,8 @@ set -eu
 
 repo=$(CDPATH= cd -- "$(dirname -- "$0")/.." && pwd -P)
 lock="$repo/dependencies.lock.json"
-jerboa_commit=063dc728b171b6039887edb42acecd201f5dd3f0 # gitsafe:ignore
-jerboa_tree=08e730fabd0754a09c6b50b072823385540bc627 # gitsafe:ignore
+jerboa_commit=778d80053579958c2297c6f183517fdf1db94950 # gitsafe:ignore
+jerboa_tree=d643e4a71c3d517cc14732ff7e7b87fe578b014b # gitsafe:ignore
 gradle_sha=20f1b1176237254a6fc204d8434196fa11a4cfb387567519c61556e8710aed78
 jdk_macos_sha=8fa1eff40bb637a33613b2ccb8b12c70dc3661cc22cf8e784943715769a05336
 jdk_linux_sha=d8afc263758141a66e0e3aafc321e783f7016696f4eaea067d340a269037d331
diff --git a/templates/ssd-review.ss b/templates/ssd-review.ss
index fa30bb1..0275fd9 100644
--- a/templates/ssd-review.ss
+++ b/templates/ssd-review.ss
@@ -777,6 +777,44 @@
                       (json-array-opt-float32 (nullable-get json) (int32 2) (float32 0.0))
                       (json-array-opt-float32 (nullable-get json) (int32 3) (float32 0.0)))))))))
 
+    (typed-kotlin-file "com/sfb/ssdreview/SsdCellJson.kt"
+      (kotlin-imports (org json JSONArray) (org json JSONObject))
+      (typed-library (com sfb ssdreview)
+        (export ssdCellToJson ssdCellFromJson)
+        (type JSONObject)
+        (type JSONArray)
+        (type SsdCell)
+        (type Float32)
+        (type Int32)
+        (def (zeroMeanBgr) : JSONArray
+          (let ((mean (json-array-empty)))
+            (begin
+              (json-array-put-int32! mean (int32 0))
+              (json-array-put-int32! mean (int32 0))
+              (json-array-put-int32! mean (int32 0))
+              mean)))
+        (def (ssdCellToJson (cell : SsdCell)) : JSONObject
+          (let ((json (json-object-empty)))
+            (begin
+              (json-object-put-string! json "id" (SsdCell-id cell))
+              (json-object-put-float32! json "x" (SsdCell-x cell))
+              (json-object-put-float32! json "y" (SsdCell-y cell))
+              (json-object-put-float32! json "w" (SsdCell-w cell))
+              (json-object-put-float32! json "h" (SsdCell-h cell))
+              (json-object-put-float32! json "cx" (ssdCellCx cell))
+              (json-object-put-float32! json "cy" (ssdCellCy cell))
+              (json-object-put-string! json "detector" (SsdCell-detector cell))
+              (json-object-put-json-array! json "mean_bgr" (zeroMeanBgr))
+              json)))
+        (def (ssdCellFromJson (json : JSONObject)) : SsdCell
+          (make-SsdCell
+            (json-object-opt-string json "id")
+            (json-object-opt-float32 json "x")
+            (json-object-opt-float32 json "y")
+            (json-object-opt-float32 json "w")
+            (json-object-opt-float32 json "h")
+            (json-object-opt-string-default json "detector" "truth")))))
+
     (typed-kotlin-file "com/sfb/ssdreview/Guess.kt"
       (typed-library (com sfb ssdreview)
         (export make-Guess Guess? Guess-label Guess-boxType Guess-reason)
@@ -3533,26 +3571,6 @@
        "import kotlin.math.max"
        "import kotlin.math.min"
        ""
-       "fun ssdCellToJson(cell: SsdCell): JSONObject = JSONObject()"
-       "    .put(\"id\", cell.id)"
-       "    .put(\"x\", cell.x.toDouble())"
-       "    .put(\"y\", cell.y.toDouble())"
-       "    .put(\"w\", cell.w.toDouble())"
-       "    .put(\"h\", cell.h.toDouble())"
-       "    .put(\"cx\", ssdCellCx(cell).toDouble())"
-       "    .put(\"cy\", ssdCellCy(cell).toDouble())"
-       "    .put(\"detector\", cell.detector)"
-       "    .put(\"mean_bgr\", JSONArray(listOf(0, 0, 0)))"
-       ""
-       "fun ssdCellFromJson(json: JSONObject): SsdCell = SsdCell("
-       "    id = json.optString(\"id\"),"
-       "    x = json.optDouble(\"x\").toFloat(),"
-       "    y = json.optDouble(\"y\").toFloat(),"
-       "    w = json.optDouble(\"w\").toFloat(),"
-       "    h = json.optDouble(\"h\").toFloat(),"
-       "    detector = json.optString(\"detector\", \"truth\")"
-       ")"
-       ""
        "fun ssdGroupToTruthJson(group: SsdGroup, cellsById: Map<String, SsdCell>): JSONObject {"
        "    val groupCells = group.cellIds.mapNotNull { cellsById[it] }"
        "    val ids = JSONArray()"