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;; -*-theme-d-*-
;; Copyright (C) 2008-2019, 2021, 2025 Tommi Höynälänmaa
;; Distributed under GNU Lesser General Public License version 3,
;; see file doc/LGPL-3.
;; The result type safety of the following procedures has been checked:
;; string-match
(define-body (standard-library string-utilities)
(import (standard-library list-utilities))
(add-method string-append
(unchecked-prim-proc string-append ((rest <string>)) <string> pure))
(add-method string
(unchecked-prim-proc string ((rest <character>)) <string> pure))
(add-method string-length
(unchecked-prim-proc string-length (<string>) <integer> pure))
(add-method string-ref
(unchecked-prim-proc string-ref (<string> <integer>) <character> pure))
(add-method string-empty?
(unchecked-prim-proc string-null? (<string>) <boolean> pure))
(define-simple-method substring
(((str <string>) (i-start <integer>) (i-end <integer>))
<string>
force-pure)
(let ((i-len (string-length str)))
(if (or (< i-start 0) (< i-end 0)
(> i-start i-len)
(> i-end i-len))
(raise-simple 'substring:index-out-of-range)
(let-mutable ((result <string> ""))
(do ((i <integer> i-start (+ i 1))) ((>= i i-end))
(set! result (string-append result (string (string-ref str i)))))
result))))
(define-simple-method string-last-char
(((str <string>)) <character> pure)
(let ((i-len <integer> (string-length str)))
(if (> i-len 0)
(string-ref str (- i-len 1))
(raise-simple 'string-last-char:empty-string))))
(define-simple-method replace-char
(((str <string>) (ch-src <character>) (ch-dest <character>))
<string>
force-pure)
(let ((i-len (string-length str)))
(let-mutable ((str-result <string> ""))
(do ((i <integer> 0 (+ i 1))) ((>= i i-len))
(let* ((ch-cur (string-ref str i))
(ch-new
(if (equal? ch-cur ch-src) ch-dest ch-cur)))
(set! str-result (string-append str-result (string ch-new)))))
str-result)))
(define-simple-method replace-char-with-string
(((str <string>) (ch-src <character>) (str-dest <string>))
<string>
force-pure)
(let ((i-len (string-length str)))
(let-mutable ((str-result <string> ""))
(do ((i <integer> 0 (+ i 1))) ((>= i i-len))
(let* ((ch-cur (string-ref str i))
(str-new
(if (equal? ch-cur ch-src) str-dest (string ch-cur))))
(set! str-result (string-append str-result str-new))))
str-result)))
(define-simple-method split-string (((str <string>)
(ch-split <character>))
(:uniform-list <string>)
force-pure)
(let ((i-len <integer> (string-length str)))
(let-mutable ((lst-result (:uniform-list <string>) null)
(str-cur <string> ""))
(do ((i <integer> 0 (+ i 1)))
((>= i i-len))
(let ((ch-cur (string-ref str i)))
(if (equal? ch-cur ch-split)
(begin
(set! lst-result (append lst-result
(list str-cur)))
(set! str-cur ""))
(set! str-cur (string-append str-cur (string ch-cur))))))
(append lst-result (list str-cur)))))
(define-simple-method join-strings-with-sep
(((lst (:uniform-list <string>)) (str-sep <string>)) <string> pure)
(match-type lst
((<null>) "")
((lst1 (:nonempty-uniform-list <string>))
(let ((str-head (car lst1))
(l-tail (cdr lst1)))
(if (null? l-tail)
str-head
(string-append str-head str-sep
(join-strings-with-sep l-tail str-sep)))))))
(define-simple-method string-contains-char?
(((str <string>) (ch <character>)) <boolean> force-pure)
(let ((i-len (string-length str)))
(let-mutable ((found? <boolean> #f))
(do ((i <integer> 0 (+ i 1))) ((or (>= i i-len) found?))
(if (equal? (string-ref str i) ch)
(set! found? #t)))
found?)))
(define-simple-method string-char-index
(((str <string>) (ch <character>)) <integer> force-pure)
(let ((i-len (string-length str)))
(let-mutable ((i-found <integer> -1))
(do ((i <integer> 0 (+ i 1))) ((or (>= i i-len) (>= i-found 0)))
(if (equal? (string-ref str i) ch)
(set! i-found i)))
i-found)))
(define-simple-method string-char-index-right
(((str <string>) (ch <character>))
<integer>
pure)
(let ((i-len (string-length str)))
(let-mutable ((i-result <integer> -1))
(do ((i-cur <integer> (- i-len 1) (- i-cur 1)))
((or (< i-cur 0) (>= i-result 0)) i-result)
(if (equal? (string-ref str i-cur) ch)
(set! i-result i-cur))))))
(define-simple-method string-take
(((str <string>) (i-count <integer>))
<string>
pure)
(substring str 0 i-count))
(define-simple-method string-drop
(((str <string>) (i-count <integer>))
<string>
pure)
(let ((i-len (string-length str)))
(substring str i-count i-len)))
(define-simple-method string-take-right
(((str <string>) (i-count <integer>))
<string>
pure)
(let ((i-len (string-length str)))
(if (> i-count i-len)
(raise-simple 'string-index-out-of-range)
(substring str (- i-len i-count) i-len))))
(define-simple-method string-drop-right
(((str <string>) (i-count <integer>))
<string>
pure)
(let ((i-len (string-length str)))
(if (> i-count i-len)
(raise-simple 'string-index-out-of-range)
(substring str 0 (- i-len i-count)))))
(define-simple-method search-substring
(((str <string>) (str-match <string>)) <integer> pure)
(let* ((i-len (string-length str))
(i-match-len (string-length str-match))
(i-limit (- i-len i-match-len)))
(if (> i-match-len i-len)
(raise-simple 'search-substring:index-out-of-range)
(let-mutable ((i-found <integer> -1))
(do ((i1 <integer> 0 (+ i1 1)))
((or (>= i1 i-limit) (>= i-found 0)) i-found)
(if
(let-mutable ((success2? <boolean> #t))
(do ((i2 <integer> 0 (+ i2 1)))
((or (>= i2 i-match-len) (not success2?)) success2?)
(if (not (character=? (string-ref str (+ i1 i2))
(string-ref str-match i2)))
(set! success2? #f))))
(set! i-found i1)))))))
(define-simple-method search-substring-from-end
(((str <string>) (str-match <string>)) <integer> pure)
(let ((i-len (string-length str))
(i-match-len (string-length str-match)))
(if (> i-match-len i-len)
(raise-simple 'search-substring-from-end:index-out-of-range)
(let-mutable ((i-found <integer> -1))
(do ((i1 <integer> (- i-len i-match-len) (- i1 1)))
((or (< i1 0) (>= i-found 0)) i-found)
(if
(let-mutable ((success2? <boolean> #t))
(do ((i2 <integer> 0 (+ i2 1)))
((or (>= i2 i-match-len) (not success2?)) success2?)
(if (not (character=? (string-ref str (+ i1 i2))
(string-ref str-match i2)))
(set! success2? #f))))
(set! i-found i1)))))))
(add-method string-match
(unchecked-prim-proc theme-string-match (<string> <string>)
<string-match-result>
pure))
(define-simple-method string-exact-match?
(((str-pattern <string>) (str-source <string>)) <boolean> pure)
(let ((tp-match <string-match-result>
(string-match str-pattern str-source)))
(match-type tp-match
((tp1 (:tuple <string> <integer> <integer>))
(and (equal? (tuple-ref tp1 1) 0)
(equal? (tuple-ref tp1 2) (string-length str-source))))
(else #f)))))
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