Eliminate one set of dummy wrappers

syndicate/HOWITWORKS.md

@@ -145,7 +145,7 @@ on a dataflow variable, and that variable changes, the entire handler
 is removed, reevaluated, and reinstalled.
 
     constantmap :: P -> [(H, E)]
-    constantmap p  = cmap [0] p
+    constantmap p  = cmap [] p
       where
         cmap :: H -> P -> [(H, E)]
         cmap h e                 = [(h, e)]
@@ -158,7 +158,7 @@ is removed, reevaluated, and reinstalled.
 Finally, a capture map extracts all capturing positions in a pattern:
 
     capturemap :: P -> [H]
-    capturemap p  = vmap [0] p
+    capturemap p  = vmap [] p
       where
         vmap :: H -> P -> [H]
         vmap h e                = []
@@ -241,10 +241,8 @@ cases where handlers are dynamically installed.
   given path `h` from an overall value `v`.
 
     project :: V -> H -> V
-    project v h = go dummy(v) h             -- TODO: gross
-      where
-        go v                 []  = v
-        go x(v_0, ... v_i) (n:h) = v_n @ h
+    project v [] = v
+    project x(v_0, ..., v_i) (n:h) = project v_n h
 
 **Definition.** The `projectMany` function projects a sequence of
   subvalues.
@@ -267,7 +265,7 @@ cases where handlers are dynamically installed.
 
     extend :: Node -> S -> Continuation
     extend node s =
-        let (_, (cont, _)) = walk-edge [0] node 0 0 [s]
+        let (_, (cont, _)) = walk-node [] node 0 0 s
         cont
       where
 

syndicate/pattern.rkt

@@ -192,7 +192,7 @@
         ['() '()]
         [(cons p pieces) (append (walk-node (cons index key-rev) p)
                                  (walk-edge (+ index 1) key-rev pieces))]))
-    (walk-node '(0) desc))
+    (walk-node '() desc))
 
   (define (desc->key desc)
     (select-pattern-leaves desc

syndicate/skeleton.rkt

@@ -222,7 +222,7 @@
       [(cons p pieces)
        (let-values (((pop-count sk) (walk-node! path sk pop-count index p)))
          (walk-edge! (update-path path 1 (+ index 1)) sk pop-count (+ index 1) pieces))]))
-  (let-values (((_pop-count sk) (walk-edge! '(0) sk 0 0 (list desc))))
+  (let-values (((_pop-count sk) (walk-node! '() sk 0 0 desc)))
     sk))
 
 (define (add-interest! sk i)
@@ -340,7 +340,7 @@
     (apply-projection-path term path)))
 
 (define (apply-projection-path term path)
-  (for/fold [(term (list term))] [(index (in-list path))]
+  (for/fold [(term term)] [(index (in-list path))]
     (cond [(non-object-struct? term) (vector-ref (struct->vector term) (+ index 1))]
           [(list? term) (list-ref term index)]
           [(vector? term) (vector-ref term index)]
@@ -369,9 +369,9 @@
 
   (define i1
     (skeleton-interest (list struct:a (list struct:b #f) #f)
-                       '((0 0 0))
+                       '((0 0))
                        '(foo)
-                       '((0 1))
+                       '((1))
                        (lambda (op . bindings)
                          (printf "xAB HANDLER: ~v ~v\n" op bindings))
                        (lambda (vars)
@@ -393,9 +393,9 @@
 
   (add-interest! sk
                  (skeleton-interest (list struct:d (list struct:b #f) #f (list struct:c #f))
-                                    '((0 2 0))
+                                    '((2 0))
                                     '(DCZ)
-                                    '((0) (0 0) (0 0 0) (0 1))
+                                    '(() (0) (0 0) (1))
                                     (lambda (op . bindings)
                                       (printf "DBC HANDLER: ~v ~v\n" op bindings))
                                     (lambda (vars)
@@ -412,9 +412,9 @@
 
   (add-interest! sk
                  (skeleton-interest (list struct:d #f (list struct:b #f) #f)
-                                    '((0 1 0))
+                                    '((1 0))
                                     '(DBY)
-                                    '((0 0) (0 2))
+                                    '((0) (2))
                                     (lambda (op . bindings)
                                       (printf "xDB HANDLER: ~v ~v\n" op bindings))
                                     (lambda (vars)

syndicate/term.rkt

@@ -50,7 +50,7 @@
       [(cons p pieces) (append (walk-node (cons index key-rev) p)
                                (walk-edge (+ index 1) key-rev pieces))]))
 
-  (walk-node '(0) t))
+  (walk-node '() t))
 
 (define (term->skeleton-proj t)
   (select-term-leaves t

syndicate/test/pattern-test.rkt

@@ -33,19 +33,19 @@
 
   (check-analyse-pattern '() $cap desc->key)
   (check-analyse-pattern '() $cap desc->skeleton-proj)
-  (check-analyse-pattern '((0)) $cap desc->capture-proj)
+  (check-analyse-pattern '(()) $cap desc->capture-proj)
   (check-analyse-pattern '#f $cap (s->d desc->skeleton-stx))
   (check-analyse-pattern '(capture (discard)) $cap (s->d desc->assertion-stx))
 
   (check-analyse-pattern '(123) (foo 123 $cap) desc->key)
-  (check-analyse-pattern '((0 0)) (foo 123 $cap) desc->skeleton-proj)
-  (check-analyse-pattern '((0 1)) (foo 123 $cap) desc->capture-proj)
+  (check-analyse-pattern '((0)) (foo 123 $cap) desc->skeleton-proj)
+  (check-analyse-pattern '((1)) (foo 123 $cap) desc->capture-proj)
   (check-analyse-pattern '(list struct:foo #f #f) (foo 123 $cap) (s->d desc->skeleton-stx))
   (check-analyse-pattern '(foo 123 (capture (discard))) (foo 123 $cap) (s->d desc->assertion-stx))
 
   (check-analyse-pattern '((bar 'beep)) (foo (bar 'beep) $cap) desc->key)
-  (check-analyse-pattern '((0 0)) (foo (bar 'beep) $cap) desc->skeleton-proj)
-  (check-analyse-pattern '((0 1)) (foo (bar 'beep) $cap) desc->capture-proj)
+  (check-analyse-pattern '((0)) (foo (bar 'beep) $cap) desc->skeleton-proj)
+  (check-analyse-pattern '((1)) (foo (bar 'beep) $cap) desc->capture-proj)
   (check-analyse-pattern '(list struct:foo #f #f) (foo (bar 'beep) $cap) (s->d desc->skeleton-stx))
   (check-analyse-pattern '(foo (bar 'beep) (capture (discard)))
                          (foo (bar 'beep) $cap)

syndicate/test/raw-dataspace.rkt

@@ -40,7 +40,7 @@
                    (skeleton-interest (list struct:set-box #f)
                                       '()
                                       '()
-                                      '((0 0))
+                                      '((0))
                                       (capture-facet-context
                                        (lambda (op new-value)
                                          (when (eq? '! op)
@@ -84,7 +84,7 @@
                    (skeleton-interest (list struct:box-state #f)
                                       '()
                                       '()
-                                      '((0 0))
+                                      '((0))
                                       (capture-facet-context
                                        (lambda (op v)
                                          (when (eq? '+ op)