264 lines
6.4 KiB
Scheme
264 lines
6.4 KiB
Scheme
#lang scheme
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(require syntax/parse
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syntax/private/stxparse/rep-attrs
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syntax/private/stxparse/runtime)
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(require schemeunit)
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;; tok = test pattern ok
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(define-syntax tok
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(syntax-rules ()
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[(tok s p expr #:pre [pre-p ...] #:post [post-p ...])
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(test-case (format "line ~s: ~s match ~s"
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(syntax-line (quote-syntax s))
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's 'p)
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(syntax-parse (quote-syntax s)
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[pre-p (error 'wrong-pattern "~s" 'pre-p)] ...
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[p expr]
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[post-p (error 'wrong-pattern "~s" 'post-p)] ...)
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(void))]
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[(tok s p expr)
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(tok s p expr #:pre () #:post ())]
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[(tok s p)
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(tok s p 'ok)]))
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(define-syntax-rule (bound b ...)
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(begin (bound1 b) ...))
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(define-syntax bound1
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(syntax-rules ()
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[(bound1 (name depth))
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(let ([a (attribute-binding name)])
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(check-pred attr? a)
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(when (attr? a)
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(check-equal? (attr-depth a) 'depth)))]
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[(bound1 (name depth syntax?))
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(let ([a (attribute-binding name)])
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(check-pred attr? a)
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(when (attr? a)
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(check-equal? (attr-depth a) 'depth)
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(check-equal? (attr-syntax? a) 'syntax?)))]))
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(define-syntax-rule (s= t v)
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(check-equal? (syntax->datum #'t) v))
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(define-syntax-rule (a= a v)
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(check-equal? (attribute a) v))
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(define-syntax-rule (terx s p rx ...)
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(terx* s [p] rx ...))
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(define-syntax terx*
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(syntax-rules ()
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[(terx s [p ...] rx ...)
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(test-case (format "line ~s: ~a match ~s for error"
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(syntax-line (quote-syntax s))
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's '(p ...))
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(check-exn (lambda (exn)
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(erx rx (exn-message exn)) ... #t)
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(lambda ()
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(syntax-parse (quote-syntax s)
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[p 'ok] ...)))
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(void))]))
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(define-syntax erx
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(syntax-rules (not)
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[(erx (not rx) msg)
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(check (compose not regexp-match?) rx msg)]
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[(erx rx msg)
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(check regexp-match? rx msg)]))
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;; ========
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(define-syntax-class one
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(pattern (a)))
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(define-syntax-class two
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(pattern (a b)))
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;; ========
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;; == Parsing tests
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;; -- S patterns
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;; name patterns
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(tok 1 a
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(and (bound (a 0)) (s= a 1)))
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(tok (a b c) a
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(and (bound (a 0)) (s= a '(a b c))))
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(tok 1 a
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'ok
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#:pre [] #:post [1])
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;; wildcard patterns
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(tok 1 _)
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(tok (a b c) _)
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(tok (a b) (_ _)) ;; multiple _'s allowed
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;; sc tests -> lib tests
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(tok (1) x:one
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(and (bound (x 0) (x.a 0)) (s= x '(1)) (s= x.a 1)))
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(tok (1 2) x:two
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(and (bound (x 0) (x.a 0) (x.b 0)) (s= x '(1 2)) (s= x.a 1) (s= x.b 2)))
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(tok (1 2) x:two
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'ok
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#:pre [x:one] #:post [])
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(tok (1) x:one
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'ok
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#:pre [()] #:post [x:two])
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;; check if wildcard, no attr bound
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(terx (1) _:two "expected two")
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;(terx (1 2) _:one "expected one")
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(terx (1 (2 3)) (_:one _:two) "expected one")
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(terx ((1) 2) (_:one _:two) "expected two")
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;; datum patterns
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(tok 1 1
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'ok)
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(tok 1 _
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#t
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#:pre [2] #:post [])
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(tok "here" "here"
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'ok
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#:pre ["there"] #:post [])
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(tok #f #f
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'ok
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#:pre [#t 0] #:post [_])
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(terx 1 2 "literal 2")
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(terx (1 2) 1 "literal 1")
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(terx (1 2) (1 1) "literal 1")
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;; literal patterns
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(syntax-parse #'+ #:literals (+ -)
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[+ (void)])
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(syntax-parse #'+ #:literals (+ -)
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[- (error 'wrong)]
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[+ (void)])
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(syntax-parse #'+ #:literals (+ -)
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[+ (void)]
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[_ (error 'wrong)])
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;; compound patterns
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(tok (a b c) (x y z)
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(and (bound (x 0) (y 0) (z 0)) (s= x 'a) (s= y 'b))
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#:pre [(x y)] #:post [])
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(tok (a . b) (x . y)
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(and (bound (x 0) (y 0)) (s= x 'a) (s= y 'b))
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#:pre [(x y)] #:post [])
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(tok #(a b c) #(x y z)
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(and (bound (x 0) (y 0) (z 0)) (s= x 'a) (s= y 'b)))
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(tok #(a b c) #(x y z)
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(and (bound (x 0) (y 0) (z 0)) (s= x 'a) (s= y 'b)))
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(tok #&1 #&x
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(and (bound (x 0)) (s= x 1)))
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;; head patterns
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;; See H-patterns
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;; dots patterns
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;; See EH-patterns
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;; and patterns
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(tok 1 (~and a 1)
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(and (bound (a 0)) (s= a 1)))
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(tok 1 (~and 1 1)
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'ok
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#:pre [(~and 1 2)] #:post [(~and 2 2)])
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(tok (1 2 3) (~and w (x y z))
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(and (bound (w 0) (x 0) (y 0) (z 0))
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(s= w '(1 2 3)) (s= x 1)))
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(tok (1 2 3) (~and (1 _ _) (_ 2 _) (_ _ 3))
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'ok)
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(tok (1 2 3) (~and (x _ _) (_ y _) (_ _ z))
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(and (bound (x 0) (y 0) (z 0))))
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;; or patterns
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(tok 1 (~or 1 2 3)
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'ok)
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(tok 3 (~or 1 2 3)
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'ok)
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(tok (1) (~or (a) (a b) (a b c))
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(and (bound (a 0 #t) (b 0 #f) (c 0 #f)) (s= a 1) (a= b #f) (a= c #f)))
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(tok (1 2 3) (~or (a) (a b) (a b c))
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(and (bound (a 0 #t) (b 0 #f) (c 0 #f)) (s= a 1) (s= b 2) (s= c 3)))
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(tok 1 (~or 5 _)
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'ok)
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(tok #t (~or #t #f)
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'ok)
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(tok #t (~or (~and #t x) (~and #f x))
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(and (bound (x 0 #t))))
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;; epsilon-name patterns
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(tok (1) :one
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(and (bound (a 0)) (s= a 1)))
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(tok (1 2) :two
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(and (bound (a 0) (b 0)) (s= a 1) (s= b 2)))
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(tok (1 2) (~and x:two :two)
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(and (bound (x 0) (x.a 0) (a 0)) (s= x '(1 2)) (s= x.a 1) (s= a 1)))
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;; -- H patterns
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;; seq
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(tok (1 2 3) ((~seq 1 2) 3))
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(tok (1 2 3) (1 (~seq 2) 3))
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(tok (1 2 3) ((~seq) 1 2 3))
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;; or
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(tok (1 2 3) ((~or (~seq 1 2) 1) 3))
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(tok (1 2 3) ((~or 1 (~seq 1 2)) 3))
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(tok (1 2 3) ((~or (~seq 1) (~seq 1 2)) 3))
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(tok (1 2 3) ((~or (~seq 1) (~seq)) 1 2 3))
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(tok (1 2 3) ((~or (~seq 1) (~seq)) 1 2 3 (~or (~seq 4) (~seq))))
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;; describe
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(tok (1 2 3) ((~describe "one-two" (~seq 1 2)) 3))
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(terx (1 3 3) ((~describe "one-two" (~seq 1 2)) 3)
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"one-two")
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;; -- A patterns
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;; cut patterns
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(terx* (1 2 3) [(1 ~! 4) (1 _:nat 3)]
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"4" (not "exact nonnegative integer"))
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;; cut-in-and
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(terx* 1 [(~and a:nat ~! 2) b:nat]
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"2")
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;; cut&describe interaction
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(tok (1 (2 3)) (1 (~or (~describe "foo" (2 ~! 4)) (2 3))))
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(tok (1 2 3) (1 2 3)
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'ok
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#:pre [(~describe "foo" (1 2 ~! 4))] #:post [])
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;; bind patterns
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(tok 1 (~and x (~bind [y #'x]))
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(s= y '1))
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(tok 1 (~or x:id (~bind [x #'default]))
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(s= x 'default))
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;; fail patterns
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(tok (1 2 3) _
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'ok
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#:pre [(~fail "pass") (error 'wrong)] #:post [])
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(terx 1 (~fail "wanted 2")
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#rx"wanted 2")
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(terx 1 (~and n:nat (~fail #:unless (even? (syntax-e #'n)) "wanted even number"))
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#rx"wanted even number")
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;; fail as S-pattern
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(terx 1 (~fail "grr")
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#rx"grr")
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(tok (1 2 3) (x:nat y:nat (~parse (~or 2 3) (+ (syntax-e #'x) (syntax-e #'y))) z:nat))
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(terx (1 2 3) (x:nat y:nat (~parse 4 (+ (syntax-e #'x) (syntax-e #'y))) z:nat)
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"expected the literal 4")
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(terx (1 2 3) (x:nat y:nat (~parse (2 4) #'(x y)))
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"expected the literal 2")
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;; == Lib tests
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;; == Error tests
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