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Sequential- and random-access sequences as procedures
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Sequential- and random-access sequences as procedures

This is a variant of Mario's callable-datastructures. But contrary to that egg, I don't consider hash-tables, but only ordered sequences, presently lists, pseudolists, vectors and strings. Additionally, there are two constructors for handling arbitrary sequential- and random-access sequences. Note that both types are implemented differently.

Since those sequences are ordered, it makes sense to consider not only references but slices as well. So, for example, if vec is (make-callable #(0 1 2 3 4 5)), then (vec 1 4) or (vec 4 1) are callables comprising #(1 2 3) or #(4 3 2) respectively.

API

callablesprocedure
callables symprocedure: documentation procedure: returns the list of exported symbols if called without argument, or the documentation of sym otherwise.

make-callable

make-callable seqprocedure

constructor: transforms the sequence into a procedure of zero, one or two arguments.

zero: returns the original sequence and its length
one: returns the reference of its integer argument
two: returns the slice of its integer arguments respecting their order

make-sas-callable

make-sas-callable seq seq-cons seq-car seq-cdr seq-null?procedure: constructor for sequential-access sequences: transforms the sequence, seq, into a procedure of zero, one or two arguments as above.

make-ras-callable

make-ras-callable seq make-seq seq-ref seq-set! seq-lengthprocedure: constructor for random-access sequences: transforms the sequence, seq, into a procedure of zero, one or two arguments as above.

callable-sas?

callable-sas? xprprocedure: type predicate for callable sequential-access sequences

callable-ras?

callable-ras? xprprocedure: type predicate for callable random-access sequences

callable?

callable? xprprocedure: type predicate for arbitrary sequences

callable-length

callable-length csprocedure: returns the length of the callable sequence cs

callable-data

callable-data csprocedure: returns the encapsulated data of the callable sequence cs

callable-reverse

callable-reverse csprocedure: returns a callable sequence, which is the reverse of the original one

Requirements

None

Examples

(import callables)

(define vec (make-callable #(0 1 2 3 4 5)))

(define lst (make-callable '(0 1 2 3 4 5)))

(define pair (make-callable '(0 1 2 3 4 5 . 6)))

(define str (make-callable "012345"))

(lst 2)
; -> 2

(vec 5)
; -> 5

(str 1)
; -> #\1

(callable-length pair)
; -> 6

(callable-length str)
; -> 6

(callable-sas? lst)
; -> #t

(callable-ras? lst)
; -> #f

(callable? lst)
; -> #t

(callable? (pair 2 4))
; -> #t

(callable-data (callable-reverse pair))
; ->  '(5 4 3 2 1 0 . 6))

(callable-data vec)
; -> #(0 1 2 3 4 5)

(callable-data (lst 2 4))
; -> '(2 3)

(callable-data (pair 4 2))
; -> '(4 3 . 6)

(callable-data (str 2 5))
; -> "234"

(callable-data (str 5 2))
; -> "543"

(callable-data (callable-reverse str))
; -> "543210"

Copyright (c) 2020, Juergen Lorenz
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Version History

1.0 ; initial version

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