Extend a data format: jsonic

#lang br/quick­lang
(module reader br
  (require "reader.rkt")
  (provide read-syntax))

#lang br/quick­lang
(require "tokenizer.rkt" "parser.rkt")

(define (read-syntax path port)
  (define parse-tree (parse path (make-tokenizer port)))
  (define module-datum `(module jsonic-module jsonic/expander
                          ,parse-tree))
  (datum->syntax #f module-datum))
(provide read-syntax)

#lang br/quick­lang
(require brag/support)

(define (make-tokenizer port)
  (define (next-token)
    (define jsonic-lexer
      (lexer
       [(from/to "//" "\n") (next-token)]
       [(from/to "@$" "$@")
        (token 'SEXP-TOK (trim-ends "@$" lexeme "$@"))]
       [any-char (token 'CHAR-TOK lexeme)]))
    (jsonic-lexer port))  
  next-token)
(provide make-tokenizer)

#lang brag
jsonic-program : (jsonic-char | jsonic-sexp)*
jsonic-char    : CHAR-TOK
jsonic-sexp    : SEXP-TOK

#lang br/quick­lang
(require json)

(define-macro (jsonic-mb PARSE-TREE)
  #'(#%module-begin
     (define result-string PARSE-TREE)
     (define vali­dated-jsexpr (string->jsexpr result-string))
     (display result-string)))
(provide (rename-out [jsonic-mb #%module-begin]))

(define-macro (jsonic-char CHAR-TOK-VALUE)
  #'CHAR-TOK-VALUE)
(provide jsonic-char)

(define-macro (jsonic-program SEXP-OR-JSON-STR ...)
  #'(string-trim (string-append SEXP-OR-JSON-STR ...)))
(provide jsonic-program)

(define-macro (jsonic-sexp SEXP-STR)
  (with-pattern ([SEXP-DATUM (format-datum '~a #'SEXP-STR)])
    #'(jsexpr->string SEXP-DATUM)))
(provide jsonic-sexp)

#lang jsonic
// a line comment
[
  @$ 'null $@,
  @$ (* 6 7) $@,
  @$ (= 2 (+ 1 1)) $@,
  @$ (list "array" "of" "strings") $@,
  @$ (hash 'key-1 'null
           'key-2 (even? 3)
           'key-3 (hash 'subkey 21)) $@
]