add new token

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

@@ -8,8 +8,8 @@
 (define-lex-abbrev id-kapu
   (:or whitespace (char-set "()[]{}\",'`;#|\\")))
 
-(define-lex-abbrev id
+(define-lex-abbrev racket-id
-  (:seq (:~ (:or "-" id-kapu)) (:* (:~ id-kapu))))
+  (:seq "[" (:~ (:or "-" id-kapu)) (:* (:~ id-kapu)) "]"))
 
 (define basic-lexer
   (lexer-srcloc
@@ -17,12 +17,14 @@
    ["\n" (token 'NEWLINE lexeme)]
    [whitespace (token lexeme #:skip? #t)]
    [(from/stop-before "rem" "\n") (token 'REM lexeme)]
+   [racket-id (token 'RACKET-ID (string->symbol (trim-ends "[" lexeme "]")))] 
    [reserved-terms (token lexeme lexeme)]
+   [(:seq alphabetic (:* (:or alphabetic numeric "$")))
+    (token 'ID (string->symbol lexeme))]
    [digits (token 'INTEGER (string->number lexeme))]
    [(:or (:seq (:? digits) "." digits)
          (:seq digits "."))
     (token 'DECIMAL (string->number lexeme))]
-   [id (token 'ID (string->symbol lexeme))]
    [(:or (from/to "\"" "\"") (from/to "'" "'"))
     (token 'STRING
            (substring lexeme

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

@@ -22,7 +22,7 @@ b-for : /"for" b-id /"=" b-expr /"to" b-expr [/"step" b-expr]
 b-next : /"next" b-id
 b-def : /"def" b-id /"(" ID [/"," ID]* /")" /"=" b-expr
 b-import : /"import" b-import-name
-@b-import-name : ID | STRING
+@b-import-name : RACKET-ID | STRING
 b-export : /"export" b-export-name
 @b-export-name : ID
 b-expr : b-or-expr
@@ -35,6 +35,6 @@ 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-func
-b-func : ID /"(" b-expr [/"," b-expr]* /")"
+b-func : (ID | RACKET-ID) /"(" b-expr [/"," b-expr]* /")"
 @b-number : INTEGER | DECIMAL
 b-repl : (b-statement | b-expr) (/":" [b-repl])*