simplify jsonic

beautiful-racket/br/demo/jsonic/expander.rkt

@@ -1,7 +1,28 @@
 #lang br/quicklang
+(provide (rename-out [jsonic-mb #%module-begin])
+         jsonic-program
+         char
+         s-val)
  
 (define-macro (jsonic-mb PARSE-TREE)
   #'(#%module-begin
-     'PARSE-TREE))
-(provide (rename-out [jsonic-mb #%module-begin]))
+     (display (string-trim PARSE-TREE))))
 
+(define-macro (jsonic-program STR ...)
+  #'(string-append STR ...))
+
+(define-macro (char TOK)
+  #'TOK)
+
+(define (stringify result)
+  (cond
+    [(number? result) (number->string result)]
+    [(string? result) (format "~v" result)]
+    [(list? result) (format "[~a]" (string-join (map stringify result) ", "))]
+    [(hash? result) (format "{~a}" (string-join (for/list ([(k v) (in-hash result)])
+                                                          (format "~a: ~a" (stringify k) (stringify v))) ", "))]
+    [else (error 'unknown-thing)]))
+
+(define-macro (s-val TOK ...)
+  (with-pattern ([DATUM (read (open-input-string (apply string-append (map syntax->datum (syntax->list #'(TOK ...))))))])
+    #'(stringify DATUM)))

beautiful-racket/br/demo/jsonic/jsonic-test.rkt

@@ -1,4 +1,8 @@
 #lang br/demo/jsonic
 
-{"foo": @(+ 4 (+ 4 2)),
-      "bar" : ")"}
+{"number": @$(* 6 7)$@,
+         "string": @$(string-append "foo" "bar")$@,
+         "array": @$(range 5)$@,
+         "object": @$(hash "k1" "valstring" "k2" 42)$@
+         //   "bar" :
+         }

beautiful-racket/br/demo/jsonic/parser.rkt

@@ -1,18 +1,7 @@
 #lang brag
 
-jsonic-program: value*
+jsonic-program: (char | s-val)*
 
-value: array | object | string | number | s-val
+char: CHAR
 
-object: /"{" [kvpair (/"," kvpair)*] /"}"
-
-array: /"[" [value (/"," value)*] /"]"
-
-string: STRING
-
-number: NUMBER
-
-kvpair: STRING /":" value
-
-s-val: S-EXP
-            
+s-val: /OPEN CHAR* /CLOSE  

beautiful-racket/br/demo/jsonic/reader.rkt

@@ -14,13 +14,10 @@
     (define our-lexer
       (lexer
        [(eof) eof]
-       [(or whitespace
-            (seq "//" (complement (seq any-string "\n" any-string)) "\n")) (next-token)]
-       [(char-set ",:[]{}") lexeme]
-       [(seq "@" "(" any-string ")") (token 'S-EXP (string-trim lexeme "@"))]
-       [(seq (repetition 0 1 "-") (+ numeric) (repetition 0 1 (seq "." (* numeric))))
-        (token 'NUMBER lexeme)] ;; Q: what is grammar for a JS number?
-       [(seq "\"" (complement (seq any-string "\"" any-string)) "\"") (token 'STRING (string-trim lexeme "\""))]))
+       [(or (seq "//" (complement (seq any-string "\n" any-string)) "\n")) (next-token)]
+       [(seq "@$") (token 'OPEN lexeme)]
+       [(seq "$@") (token 'CLOSE lexeme)]
+       [any-char (token 'CHAR lexeme)]))
     (our-lexer port))  
   next-token)