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;; SPDX-License-Identifier: EUPL-1.2
;; SPDX-FileCopyrightText: 2025 Uko Kokņevičs <perkontevs@gmail.com>
(defpackage :ukkoclot/tg/message-entity
(:use :c2cl :iterate :ukkoclot/tg/type-macros :ukkoclot/tg/message-entity-type :ukkoclot/tg/user)
(:export
#:message-entity
#:make-message-entity
#:message-entity-p
#:copy-message-entity
#:message-entity-type
#:message-entity-offset
#:message-entity-length
#:message-entity-url
#:message-entity-user
#:message-entity-language
#:message-entity-custom-emoji-id
#:message-entity-extract))
(in-package :ukkoclot/tg/message-entity)
(define-tg-type message-entity
(type message-entity-type)
(offset integer)
(length integer)
(url (or string null) nil)
(user (or user null) nil)
(language (or string null) nil)
(custom-emoji-id (or string null) nil))
(unless (= char-code-limit #x110000)
(error "Some UTF-16 fuckery assumes that system chars are UTF-32"))
(defun utf16-width (ch)
(if (< (char-code ch) #x10000)
1
2))
(defun message-entity-extract (entity text)
(with-slots (length offset) entity
(if (= length 0)
""
(let* ((start (iterate
(with curr-idx16 = 0)
(for ch in-string text with-index curr-idx32)
(for curr-width = (utf16-width ch))
(when (or (= curr-idx16 offset)
(> (+ curr-idx16 curr-width) offset))
(return curr-idx32))
(setq curr-idx16 (+ curr-idx16 curr-width))
(finally (return (length text)))))
(end (iterate
(with curr-len16 = 0)
(for ch in-string text from start with-index curr-idx32)
(for curr-width = (utf16-width ch))
(when (>= curr-len16 length)
(return curr-idx32))
(setq curr-len16 (+ curr-len16 curr-width))
(finally (return (length text))))))
(subseq text start end)))))
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