edits

beautiful-racket-demo/basic-demo-2/expander.rkt

@@ -7,9 +7,9 @@
   (with-pattern
       ([((b-line NUM STMT ...) ...) #'(LINE ...)]
        [(LINE-FUNC ...) (prefix-id "line-" #'(NUM ...))]
-       [(VAR-NAME ...) (find-unique-var-names #'(LINE ...))])
+       [(VAR-ID ...) (find-unique-var-ids #'(LINE ...))])
     #'(#%module-begin
-       (define VAR-NAME 0) ...
+       (define VAR-ID 0) ...
        LINE ...
        (define line-table
          (apply hasheqv (append (list NUM LINE-FUNC) ...)))
@@ -17,10 +17,10 @@
 
 (begin-for-syntax
   (require racket/list)
-  (define (find-unique-var-names stx)
+  (define (find-unique-var-ids line-stxs)
     (remove-duplicates
-     (for/list ([var-stx (in-list (syntax-flatten stx))]
-                #:when (syntax-property var-stx 'b-id))
-       var-stx)
+     (for/list ([stx (in-list (syntax-flatten line-stxs))]
+                #:when (syntax-property stx 'b-id))
+       stx)
      #:key syntax->datum)))
 

beautiful-racket-demo/basic-demo-2/go.rkt

@@ -1,6 +1,8 @@
 #lang br
 (require "struct.rkt" "line.rkt" "misc.rkt")
-(provide b-goto b-gosub b-return b-for b-next)
+(provide b-end b-goto b-gosub b-return b-for b-next)
+
+(define (b-end) (raise (end-program-signal)))
 
 (define (b-goto num-expr)
   (raise (change-line-signal num-expr)))

beautiful-racket-demo/basic-demo-2/misc.rkt

@@ -1,6 +1,6 @@
 #lang br
 (require "struct.rkt")
-(provide (all-defined-out))
+(provide b-rem b-print b-let b-input)
 
 (define (b-rem val) (void))
 
@@ -12,6 +12,4 @@
 (define-macro (b-input ID)
   #'(b-let ID (let* ([str (read-line)]
                      [num (string->number (string-trim str))])
-                (or num str))))
-
-(define (b-end) (raise (end-program-signal)))
+                (or num str))))

beautiful-racket-demo/basic-demo-2/parser.rkt

@@ -4,7 +4,7 @@ b-program : [b-line] (/NEWLINE [b-line])*
 b-line : b-line-num [b-statement] (/":" [b-statement])* [b-rem]
 @b-line-num : INTEGER
 b-rem : REM
-@b-statement :  b-rem | b-end | b-print | b-goto  | b-let
+@b-statement : b-end | b-print | b-goto  | b-let
 | b-input | b-def | b-gosub
 | b-return | b-for | b-next | b-if
 b-end : /"end"

beautiful-racket-demo/basic-demo-2a/parser.rkt

@@ -1,8 +1,8 @@
 #lang brag
 b-program : [b-line] (/NEWLINE [b-line])*
-b-line : b-line-num [b-statement] (/":" [b-statement])*
+b-line : b-line-num [b-statement] (/":" [b-statement])* [b-rem]
 @b-line-num : INTEGER
-@b-statement : b-rem | b-end | b-print | b-goto
+@b-statement : b-end | b-print | b-goto
 b-rem : REM
 b-end : /"end"
 b-print : /"print" [b-printable] (/";" [b-printable])*