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#lang br/quicklang
( require brag/support " grammar.rkt " )
( provide ( all-defined-out ) #%module-begin )
( module+ reader
( provide read-syntax ) )
( define-lex-abbrev reserved-toks
( :or " fun " " ( " " ) " " = " " + " " , " ) )
( define lex
( lexer
[ whitespace ( lex input-port ) ]
[ reserved-toks lexeme ]
[ alphabetic ( token ' ID ( string->symbol lexeme ) ) ]
[ ( :+ ( char-set " 0123456789 " ) ) ( token ' INT ( string->number lexeme ) ) ] ) )
( define-macro top #' begin )
( define-macro ( func-def VAR VARS EXPR )
#' ( define ( VAR VARS ) EXPR ) )
( define-macro-cases expr
[ ( _ LEFT " + " RIGHT ) #' ( + LEFT RIGHT ) ]
[ ( _ OTHER ) #' OTHER ] )
( define-macro func-app #' #%app )
( define ( read-syntax src ip )
( define token-thunk ( λ ( ) ( lex ip ) ) )
( define parse-tree ( parse token-thunk ) )
( strip-context
( with-syntax ( [ PT parse-tree ] )
#' ( module mod-name algebra-demo
PT ) ) ) )