resume in runtime repl

beautiful-racket-demo/basic-demo-3/expander.rkt

@@ -1,5 +1,5 @@
 #lang br/quicklang
-(require "struct.rkt" "run.rkt" "elements.rkt")
+(require "struct.rkt" "run.rkt" "elements.rkt" "runtime.rkt")
 (provide (rename-out [b-module-begin #%module-begin])
          (all-from-out "elements.rkt"))
 
@@ -7,26 +7,29 @@
   (with-pattern
       ([((b-line NUM STMT ...) ...) #'(LINE ...)]
        [(LINE-FUNC ...) (prefix-id "line-" #'(NUM ...))]
-       [(VAR-ID ...) (find-unique-var-ids #'(LINE ...))])
+       [(VAR-ID ...) (find-property 'b-id #'(LINE ...))]
+       [(REQ-SPEC ...) (find-property 'b-require-spec #'(LINE ...))])
     #'(#%module-begin
        (module configure-runtime br
-         (require basic-demo-3/runtime)
+         (require "runtime.rkt")
-         (current-basic-port (current-output-port)))
+         (current-basic-port (current-output-port))
+         (configure-repl!))
+       (require REQ-SPEC) ...
        (define VAR-ID 0) ...
        (provide VAR-ID ...)
        LINE ...
        (define line-table
          (apply hasheqv (append (list NUM LINE-FUNC) ...)))
-       (void (parameterize ([current-output-port
+       (parameterize ([current-output-port
                              (or (current-basic-port) (open-output-nowhere))])
-               (void (run line-table)))))))
+               (void (run line-table))))))
 
 (begin-for-syntax
   (require racket/list)
-  (define (find-unique-var-ids line-stxs)
+  (define (find-property which line-stxs)
     (remove-duplicates
      (for/list ([stx (in-list (stx-flatten line-stxs))]
-                #:when (syntax-property stx 'b-id))
+                #:when (syntax-property stx which))
        stx)
      #:key syntax->datum)))
 

beautiful-racket-demo/basic-demo-3/expr.rkt

@@ -1,5 +1,5 @@
 #lang br
-(provide b-expr b-sum b-product b-neg b-expt)
+(provide b-expr b-sum b-product b-neg b-expt b-def b-func)
 
 (define (b-expr expr)
   (if (integer? expr) (inexact->exact expr) expr))
@@ -21,4 +21,13 @@
 
 (define-macro-cases b-expt
   [(_ VAL) #'VAL]
-  [(_ LEFT "^" RIGHT) #'(expt LEFT RIGHT)])
+  [(_ LEFT "^" RIGHT) #'(expt LEFT RIGHT)])
+
+(define-macro (b-def ID VAR-ID ... EXPR)
+  #'(set! ID (λ (VAR-ID ...) EXPR)))
+
+(define-macro (b-func ID EXPR ...)
+  #'(let ([result (ID EXPR ...)])
+      (if (boolean? result)
+          (if result 1 0)
+          result)))

beautiful-racket-demo/basic-demo-3/lexer.rkt

@@ -3,7 +3,7 @@
 
 (define-lex-abbrev digits (:+ (char-set "0123456789")))
 
-(define-lex-abbrev reserved-terms (:or "print" "goto" "end" "+" ":" ";" "let" "=" "input" "-" "*" "/" "^" "mod" "(" ")" "def" "if" "then" "else" "<" ">" "<>" "and" "or" "not" "gosub" "return" "for" "to" "step" "next"))
+(define-lex-abbrev reserved-terms (:or "print" "goto" "end" "+" ":" ";" "let" "=" "input" "-" "*" "/" "^" "mod" "(" ")" "def" "if" "then" "else" "<" ">" "<>" "and" "or" "not" "gosub" "return" "for" "to" "step" "next" "def" "," "require"))
 
 (define basic-lexer
   (lexer-srcloc
@@ -12,7 +12,7 @@
    [whitespace (token lexeme #:skip? #t)]
    [(from/stop-before "rem" "\n") (token 'REM lexeme)]
    [reserved-terms (token lexeme lexeme)]
-   [(:seq alphabetic (:* (:or alphabetic numeric "$")))
+   [(:seq alphabetic (:* (:or alphabetic numeric "$" "/" "-" "?")))
     (token 'ID (string->symbol lexeme))]
    [digits (token 'INTEGER (string->number lexeme))]
    [(:or (:seq (:? digits) "." digits)

beautiful-racket-demo/basic-demo-3/misc.rkt

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

beautiful-racket-demo/basic-demo-3/parser.rkt

@@ -7,6 +7,7 @@ b-rem : REM
 @b-statement : b-end | b-print | b-goto
              | b-let | b-input | b-if
              | b-gosub | b-return | b-for | b-next
+             | b-def | b-require
 b-end : /"end"
 b-print : /"print" [b-printable] (/";" [b-printable])*
 @b-printable : STRING | b-expr
@@ -20,6 +21,10 @@ b-gosub : /"gosub" b-expr
 b-return : /"return"
 b-for : /"for" b-id /"=" b-expr /"to" b-expr [/"step" b-expr]
 b-next : /"next" b-id
+b-def : /"def" b-id /"(" b-var-list /")" /"=" b-expr
+@b-var-list : ID [/"," ID]*
+b-require : /"require" b-require-spec
+@b-require-spec : ID | STRING
 b-expr : b-or-expr
 b-or-expr : [b-or-expr "or"] b-and-expr
 b-and-expr : [b-and-expr "and"] b-not-expr
@@ -29,5 +34,7 @@ b-sum : [b-sum ("+"|"-")] b-product
 b-product : [b-product ("*"|"/"|"mod")] b-neg
 b-neg : ["-"] b-expt
 b-expt : [b-expt ("^")] b-value
-@b-value : b-number | b-id | /"(" b-expr /")"
+@b-value : b-number | b-id | /"(" b-expr /")" | b-func
+b-func : ID /"(" b-input-list /")"
+@b-input-list : (ID | b-expr) [/"," (ID | b-expr)]*
 @b-number : INTEGER | DECIMAL

beautiful-racket-demo/basic-demo-3/runtime.rkt

@@ -1,3 +1,12 @@
 #lang br
-(provide current-basic-port)
+(require (prefix-in basic: (submod "main.rkt" reader)))
-(define current-basic-port (make-parameter #f))
+(provide current-basic-port configure-repl!)
+
+(define current-basic-port (make-parameter #f))
+
+(define (configure-repl!)
+  ;; wrap REPL interactions with pollen expression support
+  (define racket-read (current-read-interaction))
+  (define (basic-read src in)
+    (basic:read-syntax src in))
+  (current-read-interaction basic-read))

beautiful-racket-demo/basic-demo-3/sample-export.rkt

@@ -1,5 +1,6 @@
 #lang basic-demo-3
-10 a = 1 : a = 5
+5 def f(x, y) = x * y
+10 a = 1 : a = 5 : b = 10
 20 gosub 150
 30 a = 25
 40 gosub 150

beautiful-racket-demo/basic-demo-3/sample-import.rkt

@@ -1,3 +1,6 @@
 #lang br
-(require basic-demo-3/sample-var)
+(require "sample-export.rkt")
-(* a a)
+f
+a
+b
+(f a b)

beautiful-racket-demo/basic-demo-3/sample-require.rkt

@@ -0,0 +1,8 @@
+#lang basic-demo-3
+5 x = 5
+10 def f(x, y) = x * y
+20 print f(9, f(4,5)) : print x
+30 print 42 : require math/number-theory
+40 print prime?(15)
+50 require racket/base
+60 print max(2, 4, 10, 8)