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- Fundamental sequence operations
- Convenience procedures
- Last update
- Version History
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 sym ..procedure
documentation procedure. Shows the exported symbols and the syntax of such an exported symbol, respectively.
- seq-exception loc msg #!rest argsprocedure
generates a composite condition of type (exn sequence) with location loc, message msg and arguments args.
- seq-ref seq nprocedure
returns the nth item of the generic sequence seq
- seq-tail seq nprocedure
returns the tail of the generic sequence seq, starting at n
- seq-car seqprocedure
returns the zeroth item of the generic sequence seq
- seq-cdr seqprocedure
returns the tail of the generic sequence seq, starting at 1
- seq? xprprocedure
checks, if xpr is a sequence
- seq-null? seqprocedure
checks, if seq is empty.
- seq-random-access? seqprocedure
checks, if seq is randomly accessible
shows the sequence database
- (seq-db type? ref: ref tail: tail maker: maker ra?: random-access?)procedure
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* arg ....procedure
iterative version of cons
- list-of ok? ...procedure
returns a predicate which checks, if its argument is a list which passes every predicate ok? ...
- pseudo-list-of ok? ...procedure
returns a predicate which checks, if its argument is a pseudo-list, which passes every predicate ok? ...
- vector-of ok? ...procedure
returns a predicate which checks, if its argument is a vector which passes every predicate ok? ...
- tagged-vector kw arg ...procedure
generates a tagged vector with keyword kw and args arg ...
- tagged-vector? xprprocedure
- tagged-vector-of ok? ...procedure
generates a tagged vector predicate which checks all of its arguments
- tagged-vector-ref tv kprocedure
access to kth item of tagged vector tv
- tagged-vector-tail tv kprocedure
returns a tagged subvector of tv starting at k
- (thunk xpr ....)syntax
generates a thunk with body xpr ....
- thunk? xprprocedure
checks if xpr is a thunk, i.e. a nullary procedure
- symbol-dispatcher alistprocedure
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
Jul 12, 2018
Copyright (c) 2011-2018, Juergen Lorenz All rights reserved.
Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. Neither the name of the author nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- 2.2 ; fixed the bugfix
- 2.1 ; bug in tagged-vector? fixed, thanks to Martin Schneeweis
- 2.0 ; tagged vectors added to be used with algebraic types
- initial import