- Fundamental sequence operations
- Convenience procedures
- Last update
- Version History
Fundamental sequence operations
This module provides the minimum necessary to handle linear container datatypes under a common sequence interface. It's written primary to be used in the bindings egg but secondary to be extendable to a full-fledged sequence package.
basic-sequences[procedure] (basic-sequences sym ..)
documentation procedure. Shows the exported symbols and the syntax of such an exported symbol, respectively.
seq-exception[procedure] (seq-exception loc msg . args)
generates a composite condition of type (exn sequence) with location loc, message msg and arguments args.
seq-ref[procedure] (seq-ref seq n)
returns the nth item of the generic sequence seq
seq-tail[procedure] (seq-tail seq n)
returns the tail of the generic sequence seq, starting at n
seq-car[procedure] (seq-car seq)
returns the zeroth item of the generic sequence seq
seq-cdr[procedure] (seq-cdr seq)
returns the tail of the generic sequence seq, starting at 1
seq?[procedure] (seq? xpr)
checks, if xpr is a sequence
seq-null?[procedure] (seq-null? seq)
checks, if seq is empty.
seq-random-access?[procedure] (seq-random-access? seq)
checks, if seq is randomly accessible
shows the sequence database[procedure] (seq-db type? ref: ref tail: tail maker: maker ra?: random-access?)
adds a new custom sequence type with predicate type? and keyword arguments ref: tail: maker: ra?: naming procedures to be later accessed as seq-ref, seq-tail, seq-maker and seq-randoam-access? respectively.
cons*[procedure] (cons* arg ....)
iterative version of cons
list-of[procedure] (list-of ok? ...)
returns a predicate which checks, if its argument is a list which passes every predicate ok? ...
pseudo-list-of[procedure] (pseudo-list-of ok? ...)
returns a predicate which checks, if its argument is a pseudo-list, which passes every predicate ok? ...
vector-of[procedure] (vector-of ok? ...)
returns a predicate which checks, if its argument is a vector which passes every predicate ok? ...
tagged-vector[procedure] (tagged-vector kw arg ...)
generates a tagged vector with keyword kw and args arg ...
tagged-vector?[procedure] (tagged-vector? xpr)
tagged-vector-of[procedure] (tagged-vector-of ok? ...)
generates a tagged vector predicate which checks all of its arguments
tagged-vector-ref[procedure] (tagged-vector-ref tv k)
access to kth item of tagged vector tv
tagged-vector-tail[procedure] (tagged-vector-tail tv k)
returns a tagged subvector of tv starting at k
thunk[syntax] (thunk xpr ....)
generates a thunk with body xpr ....
thunk?[procedure] (thunk? xpr)
checks if xpr is a thunk, i.e. a nullary procedure
symbol-dispatcher[procedure] (symbol-dispatcher alist)
creates a documentation procedure as used in all modules of this library.
(use simple-exceptions basic-sequences)
(require-library basic-sequences simple-tests arrays) (import basic-sequences simple-tests (only arrays array array? array-ref array-tail array->list)) (seq-db array? ref: array-ref tail: array-tail maker: array ra?: #t) (define lst '(0 1 2 3 4)) (define pls '(0 1 2 3 . 4)) (define vec #(0 1 2 3 4)) (define arr (array 0 1 2 3 4)) (define str "01234") (seq-ref lst 3) ;-> 3 (seq-ref pls 3) ; -> 3 (seq-tail pls 4) ; -> 4 (seq-ref vec 3) ; -> 3 (seq-ref arr 3) ; -> 3 (seq-ref str 3) ; -> #\3 (seq-tail lst 3) ; -> '(3 4) (seq-tail pls 3) ; -> '(3 . 4) (seq-tail vec 3) ; -> #(3 4) (array->list (seq-tail arr 3)) ; -> '(3 4) (seq-tail str 3) ; -> "34" (seq-null? (seq-tail lst 5)) ; -> #t (seq-null? (seq-tail vec 5)) ; -> #t (seq-null? (seq-tail arr 5)) ; -> #t (seq-null? (seq-tail str 5)) ; -> #t (seq-null? (seq-tail pls 4)) ; -> #t (seq? lst) ; -> #t (seq? pls) ; -> #t (seq? vec) ; -> #t (seq? str) ; -> #t (seq? arr) ; -> #t ((seq-of integer? odd?) arr) ; -> #f ((seq-of integer? odd?) #(1 3 5 7)) ; -> #t (seq-maker lst) ; -> list (seq-maker pls) ; -> cons* (seq-maker vec) ; -> vector (seq-random-access? arr) ; -> #t (seq-random-access? vec) ; -> #t (seq-random-access? lst) ; -> #f (cons* 0 1 2 3) ; -> '(0 1 2 . 3) (thunk? (thunk 1 2 3)) ; -> #t (define tv (tagged-vector x: 0 1 2 3)) (tagged-vector-ref tv 0) ; -> x: (define null (tagged-vector x:)) (tagged-vector? null) ; -> #t (seq? null) ; -> #t (seq-null? null) ; -> #f (define tv3 (tagged-vector-tail tv 3)) (tagged-vector-ref tv3 0) ; -> x: (define tv4 (tagged-vector-tail tv 4)) (tagged-vector? tv4) ; -> #t (seq-null? tv4) ; -> #f (define tv5 (tagged-vector-tail tv 5)) (seq-null? tv5) ; -> #t (condition-case (tagged-vector-ref tv5 0) ((exn sequence) #f)) ; -> #f
Dec 23, 2016
Copyright (c) 2011-2016, Juergen Lorenz All rights reserved.
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- 2.0 ; tagged vectors added to be used with algebraic types
- initial import