...

svn: r9999

collects/stepper/internal-docs.txt

@@ -241,7 +241,11 @@ stepper-args-of-call [ADDED BY RECONSTRUCTOR] :
 stepper-hide-completed : don't show the final top-level expression binding
   for this identifier.
 
-stepper-hide-reduction : don't show the "before" step for this term.
+stepper-hide-reduction : don't show any reductions where this term is 
+  associated with the topmost mark
+
+stepper-use-val-as-final : use the return value of this expression as a
+  "completed" val in the stepper. Used for test cases.
 
 STEPPER-HINT COLLISIONS
 

collects/stepper/private/annotate.ss

@@ -253,9 +253,9 @@
 ;  h e h o m e o f t h e b r a v e ? . . .                                                         .
 ;  .. . . . . . . . . . . . . . . . . . ............................................................
 ;  . . . . . . . . . . . . . . . . . . . .                                                         .
-;  .................................................................................................
+;  .........you-know,-this-flag-doesn't-feel-quite-as...............................................
 ;  .                                                                                               .
-;  .................................................................................................
+;  ..........lighthearted-as-it-did-when-I-created-it-in-1998.......................................
 ;  .                                                                                               .
 ;  .................................................................................................
 ;  .                                                                                               .
@@ -774,6 +774,22 @@
                                                (syntax-recertify b exp (current-code-inspector) #f))
                                              bindings))))]
                   
+                  ;; this is a terrible hack... until some other language form needs it.  It wraps the 
+                  ;; given annotated expression with a break that adds the result to the list of completed
+                  ;; expressions
+                  [maybe-final-val-wrap
+                   (match-lambda 
+                     [(vector annotated free-vars) 
+                      (vector (if (stepper-syntax-property exp 'stepper-use-val-as-final)
+                                  #`(call-with-values 
+                                     (lambda () #,annotated)
+                                     (lambda results
+                                       (#,exp-finished-break (list (list #,(lambda () exp) #f (lambda () results))))
+                                       (values results)))
+                                  annotated)
+                              free-vars)]
+                     [error 'maybe-final-val-wrap "stepper internal error 20080527"])]
+                  
                   )
                ; find the source expression and associate it with the parsed expression
                ;             (when (and red-exprs foot-wrap?)
@@ -781,6 +797,7 @@
                
                
                (recertifier
+                (maybe-final-val-wrap
                  (kernel:kernel-syntax-case exp #f
                    
                    [(#%plain-lambda . clause)
@@ -1075,7 +1092,7 @@
                     (varref-abstraction #`var-stx)]
                    
                    [else 
-                                            (error 'annotate "unexpected syntax for expression: ~v" (syntax->datum exp))])))])))
+                    (error 'annotate "unexpected syntax for expression: ~v" (syntax->datum exp))]))))])))
   
   (define (stepper-recertify new-stx old-stx)
     (syntax-recertify new-stx old-stx (current-code-inspector) #f))

collects/stepper/private/reconstruct.ss

@@ -148,7 +148,9 @@
   (define (skip-step? break-kind mark-list render-settings)
     (case break-kind
       [(result-value-break)
-       #f]
+       (and (pair? mark-list)
+            (let ([expr (mark-source (car mark-list))])
+              (stepper-syntax-property expr 'stepper-hide-reduction)))]
       [(result-exp-break)
        ;; skip if clauses that are the result of and/or reductions
        (let ([and/or-clauses-consumed (stepper-syntax-property (mark-source (car mark-list)) 'stepper-and/or-clauses-consumed)])
@@ -521,8 +523,9 @@
   ; Accepts the source expression, a lifting-index which is either a number (indicating
   ;  a lifted binding) or false (indicating a top-level expression), a list of values
   ;  currently bound to the bindings, and the language level's render-settings.
-  ;; returns a vectory containing a reconstructed expression and a boolean indicating whether this is source syntax
-  ;; from a define-struct and therefore should not be unwound.
+  ;; returns a vector containing a reconstructed expression and a boolean indicating 
+  ;; whether this should not be unwound (e.g., is source syntax
+  ;; from a define-struct).
   
   (define (reconstruct-completed exp lifting-indices vals-getter render-settings)
     (if lifting-indices
@@ -537,6 +540,9 @@
             [(stepper-syntax-property exp 'stepper-define-struct-hint)
              ;; the hint contains the original syntax
              (vector (stepper-syntax-property exp 'stepper-define-struct-hint) #t)]
+            ;; for test cases, use the result here as the final result of the expression:
+            [(stepper-syntax-property exp 'stepper-use-val-as-final)
+             (vector (recon-value (car (vals-getter)) render-settings) #f)]
             [else
              (vector
               (kernel:kernel-syntax-case exp #f