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utils: Type drop-first-last.

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Sergiu Ivanov 2022-02-03 10:55:34 +01:00
parent ec28541c46
commit 403401f085
2 changed files with 23 additions and 15 deletions
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10
scribblings/utils.scrbl
View file

@ -226,6 +226,16 @@ Reads a list of symbols from a string.
(read-symbol-list "a b c")
]}
@defproc[(drop-first-last (str String)) String]{
Removes the first and the last symbol of a given string.
Useful for removing the parentheses in string representations of lists.
@examples[#:eval utils-evaluator
(drop-first-last "(a b)")
]}
@section{Additional graph utilities}
@defproc[(dotit [graph Graph]) Void]{

28
utils.rkt
View file

@ -20,7 +20,8 @@
eval-with eval1-with auto-hash-ref/explicit auto-hash-ref/:
extract-symbols any->string stringify-variable-mapping string->any
handle-org-booleans map-sexp read-org-sexp unorg unstringify-pairs
read-org-variable-mapping unorgv read-symbol-list dotit)
read-org-variable-mapping unorgv read-symbol-list drop-first-last
dotit)
(define-type Variable Symbol)
(define-type (VariableMapping A) (Immutable-HashTable Variable A))
@ -258,6 +259,14 @@
(test-case "read-symbol-list"
(check-equal? (read-symbol-list "a b c") '(a b c))))
(: drop-first-last (-> String String))
(define (drop-first-last str)
(substring str 1 (- (string-length str) 1)))
(module+ test
(test-case "drop-first-last"
(check-equal? (drop-first-last "(a b)") "a b")))
(define dotit (compose display graphviz))
)
@ -265,14 +274,14 @@
(provide eval-with eval1-with auto-hash-ref/explicit auto-hash-ref/:
extract-symbols any->string stringify-variable-mapping string->any
map-sexp read-org-sexp unorg unstringify-pairs
read-org-variable-mapping unorgv read-symbol-list dotit)
read-org-variable-mapping unorgv read-symbol-list drop-first-last
dotit)
;;; Untyped section.
(provide
;; Functions
(contract-out [drop-first-last (-> string? string?)]
[list-sets->list-strings (-> (listof (set/c any/c)) (listof string?))]
(contract-out [list-sets->list-strings (-> (listof (set/c any/c)) (listof string?))]
[pretty-print-set-sets (-> (set/c (set/c symbol?) #:kind 'dont-care) string?)]
[update-vertices/unweighted (-> graph? (-> any/c any/c) graph?)]
[update-graph (->* (graph?)
@ -317,17 +326,6 @@
(or/c (list/c key-contract val-contract)
(cons/c key-contract val-contract)))
;;; Removes the first and the last symbol of a given string.
;;;
;;; Useful for removing the parentheses in string representations of
;;; lists.
(define (drop-first-last str)
(substring str 1 (- (string-length str) 1)))
(module+ test
(test-case "drop-first-last"
(check-equal? (drop-first-last "(a b)") "a b")))
;;; Converts a list of sets of symbols to a list of strings containing
;;; those symbols.
(define (list-sets->list-strings lst)