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#!r6rs
(library (aps string-utils)
(export string-split drop1 collect-symbols-starting-with
replace-with-commas)
(import (rnrs) (aps compat) (aps list-utils))
(define (string-cdr s)
(list->string (cdr (string->list s))))
(define (drop1 s);; drop the first character from a symbol
(string->symbol (list->string (cdr (string->list (symbol->string s))))))
(define (collect-symbols-starting-with char lst)
(remove-dupl symbol=?
(deep-fold
(lambda (x a)
(if (and (symbol? x) (char=? char (string-ref (symbol->string x) 0)))
(cons x a) a)) '() lst)))
(define (replace-with-commas char lst)
(deep-map
(lambda (x)
(if (and (symbol? x) (char=? char (string-ref (symbol->string x) 0)))
(list 'unquote x) x)) lst))
;;STRING-SPLIT
;; adapted from http://schemecookbook.org/Cookbook/StringSplit
;; to match Python behaviour
(define (string-split str ch)
(define len (string-length str))
(define (split a b)
;(printf "~a: ~a ~a\n" str a b)
(cond
((>= b len)
(if (= a b) '("")
(list (substring str a b))))
((char=? ch (string-ref str b))
(if (= a b) (let ((res (split (+ 1 a) (+ 1 b))))
(if (= 0 a) (cons "" res) res))
(cons (substring str a b) (split b b))))
(else (split a (+ 1 b)))))
(split 0 0))
;;END
)
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