sx: step 3 — add :end and :line to hs tokenizer tokens

Extend hs-make-token to (type value pos &rest extras) producing dicts
{:pos :end :line :value :type}. End defaults to pos+len(value); line
defaults to 1. Both tokenize loops now track current-line via newline
counting in advance!. hs-emit! and t-emit! pass the right end and
start-line to the constructor; redundant dict-set! after construction
removed.

Mirror copied to shared/static/wasm/sx/hs-tokenizer.sx (byte-identical).

Verify: (hs-make-token "NUMBER" "1" 0) returns
  {:pos 0 :end 1 :line 1 :value "1" :type "NUMBER"}.

OCaml suite: 4529 pass, 1339 pre-existing failures (baseline). All
4/4 hs-upstream-core/sourceInfo tests now pass (was 2/4 — closes E38).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

lib/hyperscript/tokenizer.sx

@@ -8,7 +8,17 @@
 
 ;; ── Token constructor ─────────────────────────────────────────────
 
-(define hs-make-token (fn (type value pos) {:pos pos :value value :type type}))
+(define hs-make-token
+  (fn (type value pos &rest extras)
+    (let
+      ((end-arg (if (>= (len extras) 1) (nth extras 0) nil))
+       (line-arg (if (>= (len extras) 2) (nth extras 1) nil)))
+      (let
+        ((end (if (nil? end-arg)
+                  (+ pos (if (nil? value) 0 (len (str value))))
+                  end-arg))
+         (line (if (nil? line-arg) 1 line-arg)))
+        {:pos pos :end end :line line :value value :type type}))))
 
 ;; ── Character predicates ──────────────────────────────────────────
 
@@ -221,14 +231,26 @@
   (fn
     (src)
     (let
-      ((tokens (list)) (pos 0) (src-len (len src)))
+      ((tokens (list)) (pos 0) (src-len (len src)) (current-line 1))
       (define
         hs-peek
         (fn
           (offset)
           (if (< (+ pos offset) src-len) (nth src (+ pos offset)) nil)))
       (define hs-cur (fn () (hs-peek 0)))
-      (define hs-advance! (fn (n) (set! pos (+ pos n))))
+      (define
+        hs-advance!
+        (fn (n)
+          (let ((new-pos (+ pos n)))
+            (define
+              count-nl!
+              (fn (i)
+                (when (< i new-pos)
+                  (when (= (nth src i) "\n")
+                    (set! current-line (+ current-line 1)))
+                  (count-nl! (+ i 1)))))
+            (count-nl! pos)
+            (set! pos new-pos))))
       (define
         skip-ws!
         (fn
@@ -502,13 +524,14 @@
         (fn
           (type value start)
           (let
-            ((tok (hs-make-token type value start))
-              (end-pos
-                (max pos (+ start (if (nil? value) 0 (len (str value)))))))
-            (do
-              (dict-set! tok "end" end-pos)
-              (dict-set! tok "line" (len (split (slice src 0 start) "\n")))
-              (append! tokens tok)))))
+            ((end-pos
+                (max pos (+ start (if (nil? value) 0 (len (str value))))))
+              (newlines-after-start
+                (- (len (split (slice src start (max start pos)) "\n")) 1))
+              (start-line (- current-line newlines-after-start)))
+            (append!
+              tokens
+              (hs-make-token type value start end-pos start-line)))))
       (define
         scan!
         (fn
@@ -758,11 +781,30 @@
   (fn
     (src)
     (let
-      ((tokens (list)) (pos 0) (src-len (len src)))
+      ((tokens (list)) (pos 0) (src-len (len src)) (current-line 1))
       (define t-cur (fn () (if (< pos src-len) (nth src pos) nil)))
       (define t-peek (fn (n) (if (< (+ pos n) src-len) (nth src (+ pos n)) nil)))
-      (define t-advance! (fn (n) (set! pos (+ pos n))))
-      (define t-emit! (fn (type value) (append! tokens (hs-make-token type value pos))))
+      (define
+        t-advance!
+        (fn (n)
+          (let ((new-pos (+ pos n)))
+            (define
+              t-count-nl!
+              (fn (i)
+                (when (< i new-pos)
+                  (when (= (nth src i) "\n")
+                    (set! current-line (+ current-line 1)))
+                  (t-count-nl! (+ i 1)))))
+            (t-count-nl! pos)
+            (set! pos new-pos))))
+      (define
+        t-emit!
+        (fn (type value)
+          (let
+            ((end-pos (+ pos (if (nil? value) 0 (len (str value))))))
+            (append!
+              tokens
+              (hs-make-token type value pos end-pos current-line)))))
       (define
         scan-to-close!
         (fn

plans/sx-improvements.md

@@ -183,7 +183,7 @@ these when operands are known numbers/lists.
 |------|--------|--------|
 | 1 — JIT combinator bug | [x] | 882a4b76 |
 | 2 — letrec+resume | [x] | e80e655b |
-| 3 — tokenizer :end/:line | [ ] | — |
+| 3 — tokenizer :end/:line | [x] | (pending) |
 | 4 — parser spans complete | [ ] | — |
 | 5 — OCaml AdtValue + define-type + match | [ ] | — |
 | 6 — JS AdtValue + define-type + match | [ ] | — |

shared/static/wasm/sx/hs-tokenizer.sx

@@ -8,7 +8,17 @@
 
 ;; ── Token constructor ─────────────────────────────────────────────
 
-(define hs-make-token (fn (type value pos) {:pos pos :value value :type type}))
+(define hs-make-token
+  (fn (type value pos &rest extras)
+    (let
+      ((end-arg (if (>= (len extras) 1) (nth extras 0) nil))
+       (line-arg (if (>= (len extras) 2) (nth extras 1) nil)))
+      (let
+        ((end (if (nil? end-arg)
+                  (+ pos (if (nil? value) 0 (len (str value))))
+                  end-arg))
+         (line (if (nil? line-arg) 1 line-arg)))
+        {:pos pos :end end :line line :value value :type type}))))
 
 ;; ── Character predicates ──────────────────────────────────────────
 
@@ -221,14 +231,26 @@
   (fn
     (src)
     (let
-      ((tokens (list)) (pos 0) (src-len (len src)))
+      ((tokens (list)) (pos 0) (src-len (len src)) (current-line 1))
       (define
         hs-peek
         (fn
           (offset)
           (if (< (+ pos offset) src-len) (nth src (+ pos offset)) nil)))
       (define hs-cur (fn () (hs-peek 0)))
-      (define hs-advance! (fn (n) (set! pos (+ pos n))))
+      (define
+        hs-advance!
+        (fn (n)
+          (let ((new-pos (+ pos n)))
+            (define
+              count-nl!
+              (fn (i)
+                (when (< i new-pos)
+                  (when (= (nth src i) "\n")
+                    (set! current-line (+ current-line 1)))
+                  (count-nl! (+ i 1)))))
+            (count-nl! pos)
+            (set! pos new-pos))))
       (define
         skip-ws!
         (fn
@@ -502,13 +524,14 @@
         (fn
           (type value start)
           (let
-            ((tok (hs-make-token type value start))
-              (end-pos
-                (max pos (+ start (if (nil? value) 0 (len (str value)))))))
-            (do
-              (dict-set! tok "end" end-pos)
-              (dict-set! tok "line" (len (split (slice src 0 start) "\n")))
-              (append! tokens tok)))))
+            ((end-pos
+                (max pos (+ start (if (nil? value) 0 (len (str value))))))
+              (newlines-after-start
+                (- (len (split (slice src start (max start pos)) "\n")) 1))
+              (start-line (- current-line newlines-after-start)))
+            (append!
+              tokens
+              (hs-make-token type value start end-pos start-line)))))
       (define
         scan!
         (fn
@@ -538,7 +561,8 @@
                     (= (hs-peek 1) "#")
                     (= (hs-peek 1) "[")
                     (= (hs-peek 1) "*")
-                    (= (hs-peek 1) ":")))
+                    (= (hs-peek 1) ":")
+                    (= (hs-peek 1) "$")))
                 (do (hs-emit! "selector" (read-selector) start) (scan!))
                 (and (= ch ".") (< (+ pos 1) src-len) (= (hs-peek 1) "."))
                 (do (hs-emit! "op" ".." start) (hs-advance! 2) (scan!))
@@ -757,11 +781,30 @@
   (fn
     (src)
     (let
-      ((tokens (list)) (pos 0) (src-len (len src)))
+      ((tokens (list)) (pos 0) (src-len (len src)) (current-line 1))
       (define t-cur (fn () (if (< pos src-len) (nth src pos) nil)))
       (define t-peek (fn (n) (if (< (+ pos n) src-len) (nth src (+ pos n)) nil)))
-      (define t-advance! (fn (n) (set! pos (+ pos n))))
-      (define t-emit! (fn (type value) (append! tokens (hs-make-token type value pos))))
+      (define
+        t-advance!
+        (fn (n)
+          (let ((new-pos (+ pos n)))
+            (define
+              t-count-nl!
+              (fn (i)
+                (when (< i new-pos)
+                  (when (= (nth src i) "\n")
+                    (set! current-line (+ current-line 1)))
+                  (t-count-nl! (+ i 1)))))
+            (t-count-nl! pos)
+            (set! pos new-pos))))
+      (define
+        t-emit!
+        (fn (type value)
+          (let
+            ((end-pos (+ pos (if (nil? value) 0 (len (str value))))))
+            (append!
+              tokens
+              (hs-make-token type value pos end-pos current-line)))))
       (define
         scan-to-close!
         (fn