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":";exec snow -- "$0" "$@"
;;;
;;;; Tests for the GLR parser generator
;;;
;;
;; @created "Fri Aug 19 11:23:48 EDT 2005"
;;
(package* glr-test/v1.0.0
(require: lalr/v2.4.0))
(define (syntax-error msg . args)
(display msg (current-error-port))
(for-each (cut format (current-error-port) " ~A" <>) args)
(newline (current-error-port))
(throw 'misc-error))
(define (make-lexer words)
(let ((phrase words))
(lambda ()
(if (null? phrase)
'*eoi*
(let ((word (car phrase)))
(set! phrase (cdr phrase))
word)))))
;;;
;;;; Test 1
;;;
(define parser-1
;; Grammar taken from Tomita's "An Efficient Augmented-Context-Free Parsing Algorithm"
(lalr-parser
(driver: glr)
(expect: 2)
(*n *v *d *p)
(<s> (<np> <vp>)
(<s> <pp>))
(<np> (*n)
(*d *n)
(<np> <pp>))
(<pp> (*p <np>))
(<vp> (*v <np>))))
(define *phrase-1* '(*n *v *d *n *p *d *n *p *d *n *p *d *n))
(define (test-1)
(parser-1 (make-lexer *phrase-1*) syntax-error))
;;;
;;;; Test 2
;;;
(define parser-2
;; The dangling-else problem
(lalr-parser
(driver: glr)
(expect: 1)
((nonassoc: if then else e s))
(<s> (s)
(if e then <s>)
(if e then <s> else <s>))))
(define *phrase-2* '(if e then if e then s else s))
(define (test-2)
(parser-2 (make-lexer *phrase-2*) syntax-error))
(define (assert-length l n test-name)
(display "Test '")
(display test-name)
(display (if (not (= (length l) n)) "' failed!" "' passed!"))
(newline))
(assert-length (test-1) 14 1)
(assert-length (test-2) 2 2)
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