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;;; test-lr-single-expressions.scm --
;;
;;Grammar accepting single expressions.
;;
(load "common-test.scm")
(define (doit . tokens)
(let ((parser (lalr-parser (expect: 0)
(N O C (left: A) (left: M) (nonassoc: U))
(E (N) : $1
(E A E) : ($2 $1 $3)
(E M E) : ($2 $1 $3)
(A E (prec: U)) : ($1 $2)
(O E C) : $2))))
(parser (make-lexer tokens) error-handler)))
;;; --------------------------------------------------------------------
(check ;correct input
(doit (make-lexical-token 'N #f 1))
=> 1)
(check ;correct input
(doit (make-lexical-token 'A #f -)
(make-lexical-token 'N #f 1))
=> -1)
(check ;correct input
(doit (make-lexical-token 'A #f +)
(make-lexical-token 'N #f 1))
=> 1)
(check ;correct input
(doit (make-lexical-token 'N #f 1)
(make-lexical-token 'A #f +)
(make-lexical-token 'N #f 2))
=> 3)
(check ;correct input
(doit (make-lexical-token 'N #f 1)
(make-lexical-token 'A #f +)
(make-lexical-token 'N #f 2)
(make-lexical-token 'M #f *)
(make-lexical-token 'N #f 3))
=> 7)
(check ;correct input
(doit (make-lexical-token 'O #f #\()
(make-lexical-token 'N #f 1)
(make-lexical-token 'A #f +)
(make-lexical-token 'N #f 2)
(make-lexical-token 'C #f #\))
(make-lexical-token 'M #f *)
(make-lexical-token 'N #f 3))
=> 9)
;;; end of file
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