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(define-record-type Flexvector
(%make-flexvector fv-vector fv-length)
flexvector?
(fv-vector vec set-vec!)
(fv-length flexvector-length set-flexvector-length!))
(define (cap fv)
(vector-length (vec fv)))
(define (grow! fv)
(define old-vec (vec fv))
(define new-vec (make-vector (quotient (* (vector-length old-vec) 3) 2)))
(vector-copy! new-vec 0 old-vec)
(set-vec! fv new-vec)
new-vec)
(define make-flexvector
(case-lambda
((size)
(assume (>= size 0))
(%make-flexvector (make-vector (max size 4)) size))
((size fill)
(assume (>= size 0))
(%make-flexvector (make-vector (max size 4) fill) size))))
(define (flexvector . xs)
(if (null? xs)
(%make-flexvector (make-vector 4) 0)
(list->flexvector xs)))
(define (flexvector-ref fv index)
(assume (flexvector? fv))
(assume (integer? index))
(assume (< -1 index (flexvector-length fv)))
(vector-ref (vec fv) index))
(define (flexvector-set! fv index x)
(assume (flexvector? fv))
(assume (integer? index))
(assume (< -1 index (flexvector-length fv)))
(let ((last-value (vector-ref (vec fv) index)))
(vector-set! (vec fv) index x)
last-value))
(define flexvector-add!
(case-lambda
((fv i x)
(assume (flexvector? fv))
(assume (integer? i))
(let* ((len (flexvector-length fv))
(v (if (< len (cap fv)) (vec fv) (grow! fv))))
(assume (<= 0 i len))
(vector-copy! v (+ i 1) v i len)
(vector-set! v i x)
(set-flexvector-length! fv (+ len 1))
fv))
((fv i . xs)
(flexvector-add-all! fv i xs))))
(define flexvector-add-back!
(case-lambda
((fv x)
(assume (flexvector? fv))
(let* ((len (flexvector-length fv))
(v (if (< len (cap fv)) (vec fv) (grow! fv))))
(vector-set! v len x)
(set-flexvector-length! fv (+ len 1))
fv))
((fv x . xs)
(flexvector-add-back! fv x)
(apply flexvector-add-back! fv xs))))
(define (flexvector-add-all! fv i xs)
(assume (flexvector? fv))
(assume (integer? i))
(assume (list? xs))
(let* ((len (flexvector-length fv))
(xv (list->vector xs))
(xvlen (vector-length xv))
(v (let lp ((v (vec fv)))
(if (< (+ len xvlen) (vector-length v)) v (lp (grow! fv))))))
(assume (<= 0 i len))
(vector-copy! v (+ i xvlen) v i len)
(vector-copy! v i xv 0 xvlen)
(set-flexvector-length! fv (+ len xvlen))
fv))
(define (flexvector-remove! fv i)
(assume (flexvector? fv))
(assume (integer? i))
(assume (<= 0 i (- (flexvector-length fv) 1)))
(let ((removed (flexvector-ref fv i)))
(flexvector-remove-range! fv i (+ i 1))
removed))
(define (flexvector-remove-range! fv start end)
(assume (flexvector? fv))
(let ((len (flexvector-length fv)))
(when (< start 0) (set! start 0))
(when (>= end len) (set! end len))
(assume (<= start end))
(vector-copy! (vec fv) start (vec fv) end)
(let ((new-len (- len (- end start))))
(vector-fill! (vec fv) #f new-len len)
(set-flexvector-length! fv new-len)))
fv)
(define (flexvector-clear! fv)
(assume (flexvector? fv))
(set-vec! fv (make-vector 4))
(set-flexvector-length! fv 0)
fv)
(define vector->flexvector
(case-lambda
((vec)
(assume (vector? vec))
(vector->flexvector vec 0 (vector-length vec)))
((vec start)
(assume (vector? vec))
(vector->flexvector vec start (vector-length vec)))
((vec start end)
(assume (vector? vec))
(assume (<= 0 start end (vector-length vec)))
(let ((len (- end start)))
(cond
((< len 4)
(let ((new-vec (make-vector 4)))
(vector-copy! new-vec 0 vec start end)
(%make-flexvector new-vec len)))
(else
(%make-flexvector (vector-copy vec start end) len)))))))
(define flexvector->vector
(case-lambda
((fv)
(assume (flexvector? fv))
(flexvector->vector fv 0 (flexvector-length fv)))
((fv start)
(assume (flexvector? fv))
(flexvector->vector fv start (flexvector-length fv)))
((fv start end)
(assume (flexvector? fv))
(assume (<= 0 start end (flexvector-length fv)))
(vector-copy (vec fv) start end))))
(define (list->flexvector xs)
(let* ((vec (list->vector xs))
(len (vector-length vec)))
(cond
((< len 4)
(let ((new-vec (make-vector 4)))
(vector-copy! new-vec 0 vec)
(%make-flexvector new-vec len)))
(else
(%make-flexvector vec len)))))
(define flexvector-filter/index!
(case-lambda
((pred? fv)
(assume (flexvector? fv))
(let ((v (vec fv)) (len (flexvector-length fv)))
(let lp ((i 0) (j 0))
(cond
((>= i len)
(set-flexvector-length! fv j)
fv)
((pred? i (vector-ref v i))
(unless (= i j) (vector-set! v j (vector-ref v i)))
(lp (+ i 1) (+ j 1)))
(else
(lp (+ i 1) j))))))
((pred? fv . fvs)
(assume (flexvector? fv))
(let ((v (vec fv)) (len (flexvector-length fv)))
(let lp ((i 0) (j 0))
(cond
((>= i len)
(set-flexvector-length! fv j)
fv)
((apply pred?
i
(vector-ref v i)
(map (lambda (fv) (flexvector-ref fv i)) fvs))
(unless (= i j) (vector-set! v j (vector-ref v i)))
(lp (+ i 1) (+ j 1)))
(else
(lp (+ i 1) j))))))))
(define flexvector-copy
(case-lambda
((fv)
(assume (flexvector? fv))
(%make-flexvector (vector-copy (vec fv))
(flexvector-length fv)))
((fv start)
(assume (flexvector? fv))
(flexvector-copy fv start (flexvector-length fv)))
((fv start end)
(assume (flexvector? fv))
(assume (<= 0 start end (flexvector-length fv)))
(vector->flexvector (vector-copy (vec fv) start end)))))
(define flexvector-copy!
(case-lambda
((to at from)
(assume (flexvector? from))
(flexvector-copy! to at from 0 (flexvector-length from)))
((to at from start)
(assume (flexvector? from))
(flexvector-copy! to at from start (flexvector-length from)))
((to at from start end)
(assume (flexvector? to))
(assume (<= 0 at (flexvector-length to)))
(assume (<= 0 start end (flexvector-length from)))
(let* ((vf (vec from))
(lt (+ (flexvector-length to) (- end start)))
(vt (let lp ((v (vec to)))
(if (< lt (vector-length v)) v (lp (grow! to))))))
(vector-copy! vt at vf start end)
(set-flexvector-length! to
(max (flexvector-length to) (+ at (- end start))))))))
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