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#lang br/quicklang
( require brag/support " grammar.rkt " )
( provide top fun expr app )
( module+ reader
( provide read-syntax ) )
( define-lex-abbrev reserved-toks
( :or " fun " " ( " " ) " " = " " + " " , " ) )
( define tokenize-1
( lexer
[ whitespace ( token lexeme #:skip? #t ) ]
[ ( from/stop-before " # " " \n " ) ( token ' COMMENT #:skip? #t ) ]
[ reserved-toks lexeme ]
[ ( :+ alphabetic ) ( token ' ID ( string->symbol lexeme ) ) ]
[ ( :+ ( char-set " 0123456789 " ) ) ( token ' INT ( string->number lexeme ) ) ] ) )
( define-macro top #' #%module-begin )
( define-macro-cases fun
[ ( _ VAR ARG0 EXPR ) #' ( define ( VAR ) EXPR ) ]
[ ( _ VAR ARG0 ARG1 EXPR ) #' ( define ( VAR ARG1 ) EXPR ) ] )
( define-macro-cases expr
[ ( _ LEFT RIGHT ) #' ( + LEFT RIGHT ) ]
[ ( _ OTHER ) #' OTHER ] )
( define-macro app #' #%app )
( define ( read-syntax src ip )
( define parse-tree ( parse src ( λ ( ) ( tokenize-1 ip ) ) ) )
( strip-bindings
( with-syntax ( [ PT parse-tree ] )
#' ( module algebra-mod algebra-demo
PT ) ) ) )