1. Generator refactored to avoid mutable state (fixing a bug).
2. Incremental progress on properly handling ellipsis patterns. svn: r11400
This commit is contained in:
Casey Klein
parent
188d8a4a98
commit
71f6c8b480
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@ -1568,6 +1568,7 @@ before the pattern compiler is invoked.
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(bind-exp (bind? . -> . any/c))
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(compile-language (-> any/c (listof nt?) (listof (listof symbol?)) compiled-lang?))
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(symbol->nt (symbol? . -> . symbol?))
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(has-underscore? (symbol? . -> . boolean?))
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(split-underscore (symbol? . -> . symbol?)))
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(provide compiled-pattern?
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print-stats)
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@ -32,7 +32,7 @@
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(let ()
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(define-language lc
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(a 1 2 3)
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(b a (a b)))
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(b a (a_1 b_!_1)))
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(test (to-table (find-base-cases lc))
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'((a . (0 0 0)) (b . (1 2)))))
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@ -58,8 +58,7 @@
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(let ()
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(define-language lang
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(a (side-condition "strin_g" #t) 1/2 #t)
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(b ()))
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(a (side-condition "strin_g" #t) 1/2 #t))
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(let* ([literals (sort (lang-literals lang) string<=?)]
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[chars (sort (unique-chars literals) char<=?)])
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(test literals '("1/2" "side-condition" "strin_g"))
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@ -268,8 +267,6 @@
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(let ()
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(define-language lang (x variable literal))
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(test (is-nt? lang 'x) #t)
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(test (is-nt? lang 'x_1) #t)
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(test (is-nt? lang 'x_!_1) #t)
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(test (is-nt? lang 'y) #f))
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(let ()
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@ -283,12 +280,18 @@
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'number
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'number)
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#:num (list (λ _ 2) (λ _ 3) (λ _ 4))))
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'(2 3 4 2 3)))
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'(2 3 4 2 3))
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;;FIXME
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#;(test
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(generate
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lang (variable_1 ...) 5 0
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(decisions #:seq (list (λ () 2))
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#:var (list (λ _ 'x) (λ _ 'y) (λ _ 'x))))
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'(x y)))
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(let ()
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(define-language lang
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(e (x x_1 x_1) #:binds x x_1
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(x variable_1) #:binds x variable_1)
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(e (x x_1 x_1) #:binds x x_1)
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(x variable))
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(test
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(let/ec k
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@ -298,13 +301,6 @@
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#:nt (patterns '(x x_1 x_1)
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'variable
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'variable))))
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'(x))
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(test
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(let/ec k
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(generate
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lang e 5 0
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(decisions #:var (list (λ _ 'x) (λ (c l b a) (k b)))
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#:nt (patterns '(x variable_1) 'variable))))
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'(x)))
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(let ()
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@ -387,12 +383,10 @@
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(b 4)
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(c (side-condition (name x d) (zero? (term x))))
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(d 2 1 0)
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(e ((side-condition (name d_1 d) (zero? (term d_1))) d_1))
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(f ((side-condition d_1 (zero? (term d_1))) (name d_1 d))))
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(e ((side-condition (name d_1 d) (zero? (term d_1))) d_1)))
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(test (generate lang a 5 0) 4)
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(test (generate lang c 5 0) 0)
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(test (generate lang e 5 0) '(0 0))
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(test (generate lang f 5 0) '(0 0)))
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(test (generate lang e 5 0) '(0 0)))
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(let ()
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(define-language lang
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@ -401,6 +395,9 @@
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(B (6 (hole h)))
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(C hole)
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(d (x (in-hole C y)) #:binds x y)
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(e ((in-hole (in-hole f (number_1 hole)) number_1) number_1))
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(f (in-hole C (number_1 hole)))
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(g (in-hole (side-condition (hole number_1) (zero? (term number_1))) number_2))
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(x variable)
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(y variable))
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(test
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@ -421,7 +418,11 @@
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(decisions #:var (list (λ _ 'x) (λ _ 'x) (λ _ 'y) (λ _ 'y) (λ _ 'z))))
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'(x y z))
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(test (let/ec k (generate lang d 5 0 (decisions #:var (list (λ _ 'x) (λ (c l b a) (k b))))))
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'(x)))
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'(x))
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(test (generate lang e 5 0 (decisions #:num (list (λ _ 1) (λ _ 2))))
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'((1 (2 2)) 2))
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(test (generate lang g 5 0 (decisions #:num (list (λ _ 1) (λ _ 2) (λ _ 1) (λ _ 0))))
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'(1 0)))
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(let ()
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(define-language lc
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@ -459,7 +460,7 @@
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(test (generate lang e 5 0) (term (hole 1))))
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;; named ellipses
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(let ()
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#;(let ()
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(define-language empty)
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(test
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(generate empty (number ..._1 variable ..._2 number ..._1) 5 0
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@ -485,4 +486,78 @@
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(test (exn:fail-message (check lang ([x d]) 2 0 (error 'pred-raised)))
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#rx"term \\(\\(x 5\\)\\) raises"))
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;; parse-pattern
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(let-syntax ([test-match (syntax-rules () [(_ p x) (test (match x [p #t] [_ #f]) #t)])])
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(test-match
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(list (struct named-ellipsis (_ 1 null '...))
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(struct named-ellipsis ('..._1 2 null '..._1)))
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(parse-pattern '(1 ... 2 ..._1)))
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(test-match
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(list 1 (struct mismatch-ellipsis ('..._!_1 2 null)))
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(parse-pattern '(1 2 ..._!_1))))
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;; ellipsis-context-sets
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(test (sort (map (λ (contexts) (map (λ (nesting) (map ellipsis-name nesting)) contexts))
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(ellipsis-context-sets (parse-pattern '(x_1 x_1 ..._1 (x_1 x_2 ..._2) ..._3))))
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(λ (m n) (string<=? (format "~s" m) (format "~s" n))))
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'(((..._2 ..._3))
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((..._3) (..._1))))
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(let ()
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(define-syntax test-ellipsis-names-rewrites
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(syntax-rules ()
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[(_ pattern expected)
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(test (to-table (ellipsis-names-rewrites (parse-pattern pattern))) expected)]))
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(test-ellipsis-names-rewrites
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'(x_1 ..._1 x_2 ..._2 x_2 ..._1)
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'((..._1 . ..._2) (..._2 . ..._2)))
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(test-ellipsis-names-rewrites
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'((x_1 ..._1 x_1 ..._2) (x_2 ..._1 x_2 ..._2) x_3 ..._2)
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'((..._1 . ..._1) (..._2 . ..._1)))
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(test-ellipsis-names-rewrites
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'(x_1 ..._1 x ..._2 x_1 ..._2)
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'((..._1 . ..._1) (..._2 . ..._1)))
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(test-ellipsis-names-rewrites
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'(x_1 ..._1 x_2 ..._2 (x_1 x_2) ..._3)
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'((..._1 . ..._2) (..._2 . ..._2) (..._3 . ..._2)))
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(test-ellipsis-names-rewrites
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'((x_1 ..._1) ..._2 x_2 ..._3 (x_1 ..._4 x_2) ..._5)
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'((..._1 . ..._1) (..._2 . ..._3) (..._3 . ..._3) (..._4 . ..._1) (..._5 . ..._3)))
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(test-ellipsis-names-rewrites
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'((x_1 ..._1) ..._!_2 (x_1 ..._3) ..._4)
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'((..._1 . ..._1) (..._3 . ..._1) (..._4 . ..._4)))
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(test-ellipsis-names-rewrites
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'((x_1 ..._!_1) ..._2 (x_1 ..._3) ..._4 (x_1 ..._5) ..._6)
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'((..._2 . ..._2) (..._3 . ..._3) (..._4 . ..._2) (..._5 . ..._3) (..._6 . ..._2)))
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(test-ellipsis-names-rewrites
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'(x_1 ..._1 x_1 ..._2 x_2 ..._1 x_2 ..._4 x_2 ..._3)
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'((..._1 . ..._1) (..._2 . ..._1) (..._3 . ..._1) (..._4 . ..._1))))
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(let ()
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(define (make-table constraints)
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(sort (hash-map constraints cons) (λ (x y) (string<=? (format "~s" x) (format "~s" y)))))
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(define-syntax test-sequence-constraints
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(syntax-rules ()
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[(_ pattern expected)
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(test (make-table (sequence-length-constraints (parse-pattern pattern)))
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expected)]))
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(test-sequence-constraints
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'(x_3 ..._3 x_1 ..._!_1 x_2 ..._3 x_2 ..._!_1)
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'((..._!_1 ..._3) (..._3 ..._!_1)))
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(test-sequence-constraints
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'(x_1 ..._!_1 x_2 ..._2 x_2 ..._!_1)
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'((..._!_1 ..._2) (..._2 ..._!_1)))
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(test-sequence-constraints
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'(x_2 ..._2 x_1 ..._!_1 x_2 ..._!_1)
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'((..._!_1 ..._2) (..._2 ..._!_1)))
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(test-sequence-constraints
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'(x_1 ..._1 x_1 ..._!_1 x_3 ..._!_1 x_2 ..._2 x_2 ..._!_1)
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'((..._!_1 ..._1 ..._2) (..._1 ..._!_1) (..._2 ..._!_1)))
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(test-sequence-constraints
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'((x_1 ..._1 x_2 ..._!_1 x_2 ..._1) ...)
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'((..._!_1 ..._1) (..._1 ..._!_1))))
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(print-tests-passed 'rg-test.ss)
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@ -130,10 +130,15 @@ To do a better job of not generating programs with free variables,
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(error 'generate "unable to generate pattern ~s in ~s attempts"
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pat generation-retries))
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(define ((disjunction . preds) x)
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(if (null? preds)
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#f
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(or ((car preds) x) ((apply disjunction (cdr preds)) x))))
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;; used in generating the `any' pattern
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(define-language sexp (sexp variable string number hole (sexp ...)))
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(define (generate* lang nt size attempt [decisions@ random-decisions@])
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(define (generate* lang pat size attempt [decisions@ random-decisions@])
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(define-values/invoke-unit decisions@
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(import) (export decisions^))
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@ -141,116 +146,126 @@ To do a better job of not generating programs with free variables,
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(define lang-chars (unique-chars lang-lits))
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(define base-table (find-base-cases lang))
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(define (generate-nt nt bound-vars size in-hole)
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(define (generate-nt nt fvt-id bound-vars size in-hole initial-state)
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(let loop ([nts (compiled-lang-lang lang)])
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(cond
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[(null? nts) (error 'generate-nt "didn't find non-terminal ~s" nt)]
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[(eq? (nt-name (car nts)) nt)
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(let* ([prods (if (zero? size) (min-prods (car nts) base-table) (nt-rhs (car nts)))]
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[rhs ((next-non-terminal-decision) prods bound-vars size)]
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[size (max 0 (sub1 size))])
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(generate-pat (rhs-pattern rhs) bound-vars (rhs-var-info rhs) size in-hole))]
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[(eq? (nt-name (car nts)) nt)
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(let*-values
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([(rhs)
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((next-non-terminal-decision)
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(if (zero? size) (min-prods (car nts) base-table) (nt-rhs (car nts)))
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bound-vars size)]
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[(term post-nt-state)
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(((generate-pat
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(append (extract-bound-vars fvt-id initial-state) bound-vars)
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(max 0 (sub1 size)))
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(rhs-pattern rhs) in-hole)
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(make-gen-state
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(make-state (map fvt-entry (rhs-var-info rhs)) #hasheq() #hasheq())
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(if in-hole initial-state #f)))]
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[(new-state) (if in-hole (gen-state-hole post-nt-state) initial-state)])
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(values term (extend-found-vars fvt-id term new-state)))]
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[else (loop (cdr nts))])))
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(define-struct found-vars (nt source bound-vars found-nt?))
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(define (generate-pat pat bound-vars var-info size in-hole)
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(let* ([found-vars-table (map (λ (binds) (make-found-vars (binds-binds binds) (binds-source binds) '() #f))
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var-info)]
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[matches (make-immutable-hasheq null)]
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[mismatches (make-immutable-hasheq null)])
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(let loop ([pat pat] [in-hole in-hole])
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(define (generate/retry #:gen [gen (λ (p) (loop p in-hole))] success? . subpatterns)
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(let ([old-fvt found-vars-table]
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[old-matches matches]
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[old-mismatches mismatches])
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(let retry ([remaining generation-retries])
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(if (zero? remaining)
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(generation-failure pat)
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(let ([generated (map gen subpatterns)])
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(if (apply success? generated)
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(if (= 1 (length generated))
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(car generated)
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generated)
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(begin
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(set! found-vars-table old-fvt)
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(set! matches old-matches)
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(set! mismatches old-mismatches)
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(retry (sub1 remaining)))))))))
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(match pat
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[`number ((next-number-decision) random-numbers)]
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[`(variable-except ,vars ...)
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(generate/retry (λ (var) (not (memq var vars))) 'variable)]
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[`variable ((next-variable-decision) lang-chars lang-lits bound-vars attempt)]
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[`variable-not-otherwise-mentioned
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(generate/retry (λ (var) (not (memq var (compiled-lang-literals lang)))) 'variable)]
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[`(variable-prefix ,prefix)
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(string->symbol (string-append (symbol->string prefix)
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(symbol->string (loop 'variable in-hole))))]
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[`string ((next-string-decision) lang-chars lang-lits attempt)]
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[`(side-condition ,pattern ,(? procedure? condition))
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(define (condition-bindings bindings)
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(make-bindings (hash-map bindings (λ (name exp) (make-bind name exp)))))
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(generate/retry (λ _ (condition (condition-bindings matches))) pattern)]
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[`(name ,(? symbol? id) ,p)
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(define (generate/record)
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(let ([term (loop p in-hole)])
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(set! matches (hash-set matches id term))
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term))
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(hash-ref matches id generate/record)]
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[`hole (if in-hole (in-hole) the-hole)]
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[`(in-hole ,context ,contractum)
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(loop context (λ () (loop contractum in-hole)))]
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[`(hide-hole ,pattern) (loop pattern #f)]
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[`any
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(let-values ([(lang nt) ((next-any-decision) lang)])
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(generate* lang nt size attempt decisions@))]
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[(and (? symbol?) (? (λ (x) (or (is-nt? lang x) (underscored-built-in? x)))))
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(define ((generate-nt/underscored decorated) undecorated)
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(let* ([vars (append (extract-bound-vars decorated found-vars-table) bound-vars)]
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[term (if (is-nt? lang undecorated)
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(generate-nt undecorated vars size in-hole)
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(generate-pat undecorated vars null size in-hole))])
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(begin
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(set! found-vars-table (extend-found-vars decorated term found-vars-table))
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term)))
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(match (symbol->string pat)
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[(regexp #rx"^([^_]*)_[^_]*$" (list _ undecorated))
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(hash-ref
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matches pat
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(λ ()
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(let ([term ((generate-nt/underscored pat) (string->symbol undecorated))])
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(set! matches (hash-set matches pat term))
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term)))]
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[(regexp #rx"([^_]*)_!_[^_]*$" (list _ undecorated))
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(let* ([prior (hash-ref mismatches pat null)]
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[term (generate/retry
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(λ (t) (not (member t prior)))
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(string->symbol undecorated)
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#:gen (generate-nt/underscored pat))])
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(set! mismatches (hash-set mismatches pat (cons term prior)))
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term)]
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[else ((generate-nt/underscored pat) pat)])]
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[(or (? symbol?) (? number?) (? string?) (? boolean?)) pat]
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[(? null? pat) '()]
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[(list-rest seq '... rest)
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(loop (expand-sequence seq ((next-sequence-decision)) rest) in-hole)]
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[(list-rest seq (? named-ellipsis? name) rest)
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(let* ([match-len (hash-ref matches name #f)]
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[seq-len
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(if match-len
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match-len
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(let ([len ((next-sequence-decision))])
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(begin
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(set! matches (hash-set matches name len))
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len)))])
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(loop (expand-sequence seq seq-len rest) in-hole))]
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[(list-rest pat rest)
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(cons (loop pat in-hole) (loop rest in-hole))]
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[else
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(error 'generate "unknown pattern ~s\n" pat)]))))
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(define (extract-bound-vars pat found-vars-table)
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(let loop ([found-vars-table found-vars-table])
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(define-struct gen-state (current hole))
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(define-struct state (fvt matches mismatches))
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(define (set-current-matches state id term)
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(make-gen-state
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(make-state
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(state-fvt (gen-state-current state))
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(hash-set (state-matches (gen-state-current state)) id term)
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(state-mismatches (gen-state-current state)))
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(gen-state-hole state)))
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(define (set-current-mismatches state id term)
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(make-gen-state
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(make-state
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(state-fvt (gen-state-current state))
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(state-matches (gen-state-current state))
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(hash-set (state-mismatches (gen-state-current state)) id term))
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(gen-state-hole state)))
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(define-struct found-vars (nt source bound-vars found-nt?))
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(define (fvt-entry binds)
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(make-found-vars (binds-binds binds) (binds-source binds) '() #f))
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(define (((generate-pat bound-vars size) pat in-hole [fvt-id pat]) state)
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(define recur (generate-pat bound-vars size))
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(define (recur/pat pat) ((recur pat in-hole) state))
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(define (generate/pred pred pat [gen (λ () (recur/pat pat))])
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(let retry ([remaining generation-retries])
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(if (zero? remaining)
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(generation-failure pat)
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||||
(let-values ([(term state) (gen)])
|
||||
(if (pred term (state-matches (gen-state-current state)))
|
||||
(values term state)
|
||||
(retry (sub1 remaining)))))))
|
||||
(match pat
|
||||
[`number (values ((next-number-decision) random-numbers) state)]
|
||||
[`(variable-except ,vars ...)
|
||||
(generate/pred (λ (var _) (not (memq var vars))) 'variable)]
|
||||
[`variable (values ((next-variable-decision) lang-chars lang-lits bound-vars attempt) state)]
|
||||
[`variable-not-otherwise-mentioned
|
||||
(generate/pred (λ (var _) (not (memq var (compiled-lang-literals lang)))) 'variable)]
|
||||
[`(variable-prefix ,prefix)
|
||||
(define (symbol-append prefix suffix)
|
||||
(string->symbol (string-append (symbol->string prefix) (symbol->string suffix))))
|
||||
(let-values ([(term state) (recur/pat 'variable)])
|
||||
(values (symbol-append prefix term) state))]
|
||||
[`string (values ((next-string-decision) lang-chars lang-lits attempt) state)]
|
||||
[`(side-condition ,pat ,(? procedure? condition))
|
||||
;; `matches' includes bindings beyond those bound in `pat',
|
||||
;; but compiled side-conditions ignore these.
|
||||
(generate/pred (λ (_ matches) (condition (make-bindings (hash-map matches make-bind)))) pat)]
|
||||
[`(name ,(? symbol? id) ,p)
|
||||
(let-values ([(term state) (recur/pat p)])
|
||||
(values term (set-current-matches state id term)))]
|
||||
[`hole
|
||||
(cond [(not in-hole) (values the-hole state)]
|
||||
[(gen-state-hole state)
|
||||
(let-values ([(term hole-state) (in-hole (gen-state-hole state))])
|
||||
(values term (make-gen-state (gen-state-current state) hole-state)))]
|
||||
[else (in-hole state)])]
|
||||
[`(in-hole ,context ,contractum)
|
||||
((recur context (recur contractum in-hole)) state)]
|
||||
[`(hide-hole ,pattern) ((recur pattern #f) state)]
|
||||
[`any
|
||||
(let-values ([(lang nt) ((next-any-decision) lang)])
|
||||
(values (generate* lang nt size attempt decisions@) state))]
|
||||
[(? (λ (p) (is-nt? lang p)))
|
||||
(generate-nt pat fvt-id bound-vars size in-hole state)]
|
||||
[(and (? symbol?) (app symbol->string (regexp named-nt-rx (list _ nt))))
|
||||
(let* ([undecorated (string->symbol nt)]
|
||||
[none (gensym)]
|
||||
[prior (hash-ref (state-matches (gen-state-current state)) pat none)])
|
||||
(if (eq? prior none)
|
||||
(let-values
|
||||
([(term state) ((recur undecorated in-hole pat) state)])
|
||||
(values term (set-current-matches state pat term)))
|
||||
(values prior state)))]
|
||||
[(and (? symbol?) (app symbol->string (regexp mismatch-nt-rx (list _ nt))))
|
||||
(let*-values
|
||||
([(undecorated) (string->symbol nt)]
|
||||
[(prior) (hash-ref (state-mismatches (gen-state-current state)) pat null)]
|
||||
[(generate-mismatch)
|
||||
(λ () ((recur undecorated in-hole pat) state))]
|
||||
[(term state)
|
||||
(generate/pred (λ (t _) (not (member t prior))) undecorated generate-mismatch)])
|
||||
(values term (set-current-mismatches state pat (cons term prior))))]
|
||||
[(? (disjunction symbol? number? string? boolean? null?)) (values pat state)]
|
||||
[(list-rest pat '... rest)
|
||||
(recur/pat (append (build-list ((next-sequence-decision)) (λ (_) pat)) rest))]
|
||||
[(list-rest pat rest)
|
||||
(let*-values
|
||||
([(pat-term state) (recur/pat pat)]
|
||||
[(rest-term state)
|
||||
((recur rest in-hole) state)])
|
||||
(values (cons pat-term rest-term) state))]
|
||||
[else
|
||||
(error 'generate "unknown pattern ~s\n" pat)]))
|
||||
|
||||
(define (extract-bound-vars pat state)
|
||||
(let loop ([found-vars-table (state-fvt (gen-state-current state))])
|
||||
(cond
|
||||
[(null? found-vars-table) '()]
|
||||
[else (let ([found-vars (car found-vars-table)])
|
||||
|
|
@ -258,36 +273,37 @@ To do a better job of not generating programs with free variables,
|
|||
(found-vars-bound-vars found-vars)
|
||||
(loop (cdr found-vars-table))))])))
|
||||
|
||||
(define (extend-found-vars pat res found-vars-table)
|
||||
(map
|
||||
(λ (found-vars)
|
||||
(cond
|
||||
[(eq? (found-vars-source found-vars) pat)
|
||||
(let ([new-found-vars
|
||||
(make-found-vars (found-vars-nt found-vars)
|
||||
(found-vars-source found-vars)
|
||||
(cons res (found-vars-bound-vars found-vars))
|
||||
#f)])
|
||||
(when (found-vars-found-nt? found-vars)
|
||||
(error 'generate "kludge in #:binds was exposed! #:binds ~s ~s"
|
||||
(found-vars-nt found-vars)
|
||||
(found-vars-source found-vars)))
|
||||
new-found-vars)]
|
||||
[(eq? (found-vars-nt found-vars) pat)
|
||||
(make-found-vars (found-vars-nt found-vars)
|
||||
(found-vars-source found-vars)
|
||||
(found-vars-bound-vars found-vars)
|
||||
#t)]
|
||||
[else found-vars]))
|
||||
found-vars-table))
|
||||
|
||||
(define (expand-sequence seq-pat seq-len rest-pat)
|
||||
(let loop ([remaining seq-len] [acc-pat rest-pat])
|
||||
(if (zero? remaining)
|
||||
acc-pat
|
||||
(loop (sub1 remaining) (cons seq-pat acc-pat)))))
|
||||
|
||||
(generate-pat nt '() '() size #f))
|
||||
(define (extend-found-vars pat res state)
|
||||
(make-gen-state
|
||||
(make-state
|
||||
(map
|
||||
(λ (found-vars)
|
||||
(cond
|
||||
[(eq? (found-vars-source found-vars) pat)
|
||||
(let ([new-found-vars
|
||||
(make-found-vars (found-vars-nt found-vars)
|
||||
(found-vars-source found-vars)
|
||||
(cons res (found-vars-bound-vars found-vars))
|
||||
#f)])
|
||||
(when (found-vars-found-nt? found-vars)
|
||||
(error 'generate "kludge in #:binds was exposed! #:binds ~s ~s"
|
||||
(found-vars-nt found-vars)
|
||||
(found-vars-source found-vars)))
|
||||
new-found-vars)]
|
||||
[(eq? (found-vars-nt found-vars) pat)
|
||||
(make-found-vars (found-vars-nt found-vars)
|
||||
(found-vars-source found-vars)
|
||||
(found-vars-bound-vars found-vars)
|
||||
#t)]
|
||||
[else found-vars]))
|
||||
(state-fvt (gen-state-current state)))
|
||||
(state-matches (gen-state-current state))
|
||||
(state-mismatches (gen-state-current state)))
|
||||
(gen-state-hole state)))
|
||||
|
||||
(let ([initial-state (make-gen-state (make-state null #hasheq() #hasheq()) #f)])
|
||||
(let-values ([(term _) (((generate-pat null size) pat #f) initial-state)])
|
||||
term)))
|
||||
|
||||
;; find-base-cases : compiled-language -> hash-table
|
||||
(define (find-base-cases lang)
|
||||
|
|
@ -316,8 +332,8 @@ To do a better job of not generating programs with free variables,
|
|||
(let loop ([pat pat])
|
||||
(match pat
|
||||
[(? symbol? pat)
|
||||
(when (is-nt? lang pat)
|
||||
(set! nts (cons pat nts)))]
|
||||
(when (is-nt? lang (symbol->nt pat))
|
||||
(set! nts (cons (symbol->nt pat) nts)))]
|
||||
[(or (? number?) (? string?) (? procedure?) (? boolean?)) (void)]
|
||||
[`() (void)]
|
||||
[`(,a ,'... . ,b)
|
||||
|
|
@ -360,22 +376,131 @@ To do a better job of not generating programs with free variables,
|
|||
[(a b . c) (max/f a (apply max/f b c))]))
|
||||
(define (add1/f a) (if (eq? a 'inf) 'inf (+ a 1)))
|
||||
|
||||
;; is-nt? : compiled-lang symbol -> boolean
|
||||
(define (is-nt? lang sym)
|
||||
(ormap (λ (nt) (eq? (nt-name nt) (symbol->nt sym)))
|
||||
(compiled-lang-lang lang)))
|
||||
;; is-nt? : compiled-lang any -> boolean
|
||||
(define (is-nt? lang x)
|
||||
(and (hash-ref (compiled-lang-ht lang) x #f) #t))
|
||||
|
||||
;; underscored-built-in? : symbol -> boolean
|
||||
(define (underscored-built-in? sym)
|
||||
(and (memq #\_ (string->list (symbol->string sym)))
|
||||
(memq (symbol->nt sym) underscore-allowed)
|
||||
#t))
|
||||
(define named-nt-rx #rx"^([^_]+)_[^_]*$")
|
||||
(define mismatch-nt-rx #rx"([^_]+)_!_[^_]*$")
|
||||
(define named-ellipsis-rx #rx"^..._[^_]*$")
|
||||
(define mismatch-ellipsis-rx #rx"^..._!_[^_]*$")
|
||||
|
||||
;; named-ellipsis? : any -> boolean
|
||||
(define (named-ellipsis? x)
|
||||
(and (symbol? x)
|
||||
(memq #\_ (string->list (symbol->string x)))
|
||||
(eq? (symbol->nt x) '...)))
|
||||
(define-struct ellipsis (name pattern constraints))
|
||||
(define-struct (named-ellipsis ellipsis) (src-name))
|
||||
(define-struct (mismatch-ellipsis ellipsis) ())
|
||||
|
||||
;; parse-pattern : pattern -> parsed-pattern
|
||||
;; Turns "pat ..." and "pat ..._id" into named-ellipsis structs
|
||||
;; and "pat ..._!_id" into mismatch-ellipsis structs.
|
||||
(define parse-pattern
|
||||
(match-lambda
|
||||
[(list-rest pat (and (? symbol?) (app symbol->string (regexp named-ellipsis-rx)) name) rest)
|
||||
(cons (make-named-ellipsis name (parse-pattern pat) null name) (parse-pattern rest))]
|
||||
[(list-rest pat '... rest)
|
||||
(cons (make-named-ellipsis (gensym '..._) (parse-pattern pat) null '...) (parse-pattern rest))]
|
||||
[(list-rest pat (and (? symbol?) (app symbol->string (regexp mismatch-ellipsis-rx)) name) rest)
|
||||
(cons (make-mismatch-ellipsis name (parse-pattern pat) null) (parse-pattern rest))]
|
||||
[(cons first rest) (cons (parse-pattern first) (parse-pattern rest))]
|
||||
[else else]))
|
||||
|
||||
(define (hash-cons hash key val)
|
||||
(hash-set hash key (cons val (hash-ref hash key null))))
|
||||
|
||||
;; An ellipsis-context (listof ellipsis?) records the ellipses above a
|
||||
;; a position in a pattern.
|
||||
;;
|
||||
;; ellipsis-context-sets : parsed-pattern -> (listof (listof contexts))
|
||||
;; Extracts ellipsis-context-sets for each named non-teminal (e.g., x_1).
|
||||
(define (ellipsis-context-sets pattern)
|
||||
(hash-map
|
||||
(let recur ([pattern pattern] [under null] [contexts #hasheq()])
|
||||
(match pattern
|
||||
[(and (? symbol?) (app symbol->string (regexp named-nt-rx)))
|
||||
(if (null? under) contexts (hash-cons contexts pattern under))]
|
||||
[(struct ellipsis (_ sub-pattern _))
|
||||
(recur sub-pattern (cons pattern under) contexts)]
|
||||
[(? list?)
|
||||
(foldl (λ (p n) (recur p under n)) contexts pattern)]
|
||||
[_ contexts]))
|
||||
(λ (named-nt contexts) contexts)))
|
||||
|
||||
;; representative-context
|
||||
;; (cons/c ellipsis-context (listof ellipses-context)) -> ellipses-context
|
||||
;; Merges a (non-empty) list of ellipsis-contexts of common depth into a
|
||||
;; single "representative" context in which ...
|
||||
(define (representative-context contexts)
|
||||
(foldl (λ (current representative)
|
||||
(map (λ (c r) (if (named-ellipsis? c) c r))
|
||||
current representative))
|
||||
(car contexts) (cdr contexts)))
|
||||
|
||||
;; ellipsis-names-rewrites : parsed-pattern -> hash[sym -o> sym]
|
||||
;; Produces a hash mapping ellipsis names to new names, for use in
|
||||
;; `rewrite-named-ellipsis'
|
||||
(define (ellipsis-names-rewrites pat)
|
||||
; union-find w/o balancing or path compression (for now)
|
||||
(define (union e f sets)
|
||||
(hash-set sets (find f sets) (find e sets)))
|
||||
(define (find e sets)
|
||||
(let recur ([chd e] [par (hash-ref sets e #f)])
|
||||
(if (and par (not (eq? chd par))) (recur par (hash-ref sets par #f)) chd)))
|
||||
|
||||
(define (context-set-equivalence contexts classes)
|
||||
(let ([representative (representative-context contexts)])
|
||||
(foldl
|
||||
(λ (context classes)
|
||||
(foldl
|
||||
(λ (cur rep classes)
|
||||
(if (or (mismatch-ellipsis? cur) (mismatch-ellipsis? rep))
|
||||
classes
|
||||
(union (ellipsis-name rep) (ellipsis-name cur) classes)))
|
||||
classes context representative))
|
||||
classes contexts)))
|
||||
|
||||
(let ([classes (foldl context-set-equivalence #hasheq() (ellipsis-context-sets pat))])
|
||||
(make-immutable-hasheq
|
||||
(hash-map classes (λ (named-ellip _) (cons named-ellip (find named-ellip classes)))))))
|
||||
|
||||
(define (rewrite-named-ellipses pat rewrites)
|
||||
(match pat
|
||||
[(struct named-ellipsis (name sub-pat constraints src-name))
|
||||
(let ([rewritten (rewrite-named-ellipses sub-pat rewrites)])
|
||||
(make-named-ellipsis (hash-ref rewrites name name) rewritten constraints src-name))]
|
||||
[(struct mismatch-ellipsis (name sub-pat constraints))
|
||||
(make-mismatch-ellipsis name (rewrite-named-ellipses sub-pat rewrites) constraints)]
|
||||
[(? list?) (map (λ (p) (rewrite-named-ellipses p rewrites)) pat)]
|
||||
[_ pat]))
|
||||
|
||||
;; sequence-length-constraints : parsed-pattern -> hash[symbol -> (listof symbol)]
|
||||
;; Produces a hash mapping ellipsis names to the names of the ellipses that cannot
|
||||
;; have the same sequence length.
|
||||
(define (sequence-length-constraints pat)
|
||||
(define empty-set #hasheq())
|
||||
(define (extend member set) (hash-set set member #t))
|
||||
(define (member? element set) (hash-ref set element #f))
|
||||
(define (set->list set) (hash-map set (λ (elem _) elem)))
|
||||
|
||||
(define (exclude ellip from constraints)
|
||||
(hash-set constraints (ellipsis-name from)
|
||||
(extend (ellipsis-name ellip)
|
||||
(hash-ref constraints (ellipsis-name from) empty-set))))
|
||||
|
||||
(define (context-set-constraints contexts constraints)
|
||||
(let ([representative (representative-context contexts)])
|
||||
(foldl
|
||||
(λ (context constraints)
|
||||
(foldl
|
||||
(λ (cur rep constraints)
|
||||
(if (or (mismatch-ellipsis? rep) (named-ellipsis? cur))
|
||||
constraints
|
||||
(exclude cur rep (exclude rep cur constraints))))
|
||||
constraints context representative))
|
||||
constraints contexts)))
|
||||
|
||||
(make-immutable-hash
|
||||
(hash-map
|
||||
(foldl context-set-constraints #hasheq() (ellipsis-context-sets pat))
|
||||
(λ (ellip-name exclusion-set) (cons ellip-name (set->list exclusion-set))))))
|
||||
|
||||
(define-syntax check
|
||||
(syntax-rules ()
|
||||
|
|
@ -424,13 +549,11 @@ To do a better job of not generating programs with free variables,
|
|||
(define (next-any-decision) pick-any)
|
||||
(define (next-string-decision) pick-string)))
|
||||
|
||||
(define (sexp? x)
|
||||
(or (not (pair? x)) (and (list? x) (andmap sexp? x))))
|
||||
|
||||
(provide pick-from-list pick-var pick-length min-prods decisions^
|
||||
is-nt? lang-literals pick-char random-string pick-string
|
||||
check pick-nt unique-chars pick-any sexp generate)
|
||||
check pick-nt unique-chars pick-any sexp generate parse-pattern
|
||||
ellipsis-context-sets ellipsis-names-rewrites sequence-length-constraints
|
||||
(struct-out ellipsis) (struct-out named-ellipsis) (struct-out mismatch-ellipsis))
|
||||
|
||||
(provide/contract
|
||||
[find-base-cases (-> compiled-lang? hash?)])
|
||||
|
||||
[find-base-cases (-> compiled-lang? hash?)])
|
||||
Loading…
Reference in New Issue
Block a user