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;; SPDX-License-Identifier: EUPL-1.2
;; SPDX-FileCopyrightText: 2025 Uko Kokņevičs <perkontevs@gmail.com>
(defpackage :ukkoclot/strings
(:documentation "String-oriented utilities.")
(:use :c2cl :iterate)
(:import-from :cl-unicode :general-category)
(:export
:escape-xml
:is-tg-whitespace
:is-tg-whitespace-str))
(in-package :ukkoclot/strings)
;; These are very inefficient but I don't care until I profile
(defun escape-xml (str &optional out)
"Escape special XML characters in the STR.
OUT is the output stream or `nil' for outputting to a string."
(if out
(escape-xml% str out)
(with-output-to-string (out)
(escape-xml% str out))))
(defun escape-xml% (str out)
"See `escape-xml'.
OUT is always the stream."
(loop for ch across str do
(case ch
(#\< (write-string "<" out))
(#\> (write-string ">" out))
(#\& (write-string "&" out))
(#\" (write-string """ out))
(otherwise (write-char ch out)))))
(defun is-tg-whitespace (ch)
"Checks if CH on its own would be considered whitespace by telegram."
(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)
"Checks if message containing just STR would be considered whitespace by telegram."
(iter (for ch in-string str)
(always (is-tg-whitespace ch))))
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