Hi all,
I don't understand the error message here. The parser seems to be
looking for a position-token but the lexer is sending srcloc-tokens? Is
there a simple fix? Using Racket 7.7 on WIn 10.
I am also confused about whether to use br-parser-tools or parser-tools
package. br-* is the more recent?
Thanks,
Jon
#lang racket
(require br-parser-tools/lex)
(require br-parser-tools/yacc)
(define-empty-tokens etoks (ZERO ONE EOF))
(define simple-lex
(lexer-srcloc
["0" (token-ZERO)]
["1" (token-ONE)]
[(eof) (token-EOF)]
))
(define (err-proc tok-ok? tok-name tok-value start-pos end-pos)
(display "Ugghh!"))
(define simple-parse
(parser
(tokens etoks)
(start S)
(end EOF)
(src-pos)
(error err-proc)
(grammar
(S [(ONE ZERO) 'OK])
)))
(define (make-scanner ip [path #f])
(λ () (simple-lex ip)))
(simple-parse (make-scanner (open-input-string "01")))
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