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;; SPDX-License-Identifier: EUPL-1.2
;; SPDX-FileCopyrightText: 2025 Uko Kokņevičs <perkontevs@gmail.com>
(defpackage :ukkoclot/strings
(:use :c2cl :iterate)
(:import-from :cl-unicode :general-category)
(:export :escape-xml :is-tg-whitespace-str :lisp->snake-case :snake->lisp-case :starts-with :starts-with-ignore-case))
(in-package :ukkoclot/strings)
;; These are very inefficient but I don't care until I profile
(defun escape-xml (str &optional out)
(if out
(escape-xml% str out)
(with-output-to-string (out)
(escape-xml% str out))))
(defun escape-xml% (str out)
(loop for ch across str do
(case ch
(#\< (write-string "<" out))
(#\> (write-string ">" out))
(#\& (write-string "&" out))
(#\" (write-string """ out))
(t (write-char ch out)))))
(defun is-tg-whitespace (ch)
(let ((gc (general-category ch)))
(or (string= gc "Zs") ; Separator, space
(string= gc "Zl") ; Separator, line
(string= gc "Zp") ; Separator, paragraph
(string= gc "Cc") ; Other, control
(= (char-code ch) #x2800) ; BRAILLE PATTERN BLANK
)))
(defun is-tg-whitespace-str (str)
(iter (for ch in-string str)
(always (is-tg-whitespace ch))))
(defun lisp->snake-case (str)
(with-output-to-string (out)
(loop for ch across str do
(case ch
(#\- (write-char #\_ out))
(t (write-char ch out))))))
(defun snake->lisp-case (str)
(with-output-to-string (out)
(loop for ch across str do
(case ch
(#\_ (write-char #\- out))
(t (write-char ch out))))))
(defun starts-with (str prefix)
(and (> (length str) (length prefix))
(string= str prefix :end1 (length prefix))))
(defun starts-with-ignore-case (str prefix)
(and (> (length str) (length prefix))
(string-equal str prefix :end1 (length prefix))))
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