From: Reza Nikoopour <rnikoopour@gmail.com>
To: emacs-devel@gnu.org
Subject: Help Understanding syntax-propertize-function
Date: Mon, 15 Mar 2021 15:48:13 -0700 [thread overview]
Message-ID: <CAKesZq3e0WZ50yFWtDfgfHNT1dtO0hwsYtewXQ+o-0Wh76xoMA@mail.gmail.com> (raw)
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Hello All,
I'm trying to implement here doc syntax highlighting. I've reviewed the
implementations in shell-script-mode and hcl-mode but I don't really
understand what is happening. I've read the documentation for
syntax-propertize-function (
https://www.gnu.org/software/emacs/manual/html_node/elisp/Syntax-Properties.html)
but that didn't help me understand what's going on.
Could someone help explain the following code:
(defun hcl--syntax-propertize-heredoc (end)
(let ((ppss (syntax-ppss)))
(when (eq t (nth 3 ppss))
(let ((key (get-text-property (nth 8 ppss) 'hcl-here-doc-marker))
(case-fold-search nil))
(when (re-search-forward
(concat "^\\(?:[ \t]*\\)" (regexp-quote key) "\\(\n\\)")
end 'move)
(let ((eol (match-beginning 1)))
(put-text-property eol (1+ eol)
'syntax-table (string-to-syntax "|"))))))))
(defun hcl--font-lock-open-heredoc (start string eol)
(unless (or (memq (char-before start) '(?< ?>))
(save-excursion
(goto-char start)
(hcl--in-string-or-comment-p)))
(let ((str (replace-regexp-in-string "['\"]" "" string)))
(put-text-property eol (1+ eol) 'hcl-here-doc-marker str)
(prog1 (string-to-syntax "|")
(goto-char (+ 2 start))))))
(defun hcl--syntax-propertize-function (start end)
(goto-char start)
(hcl--syntax-propertize-heredoc end)
(funcall
(syntax-propertize-rules
(hcl--here-doc-beg-re
(2 (hcl--font-lock-open-heredoc
(match-beginning 0) (match-string 1) (match-beginning 2))))
("\\s|" (0 (prog1 nil (hcl--syntax-propertize-heredoc end)))))
(point) end))
Cheers,
Reza
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next reply other threads:[~2021-03-15 22:48 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-15 22:48 Reza Nikoopour [this message]
2021-03-15 23:30 ` Help Understanding syntax-propertize-function Stefan Monnier
2021-03-15 23:58 ` Reza Nikoopour
2021-03-16 1:42 ` Stefan Monnier
2021-03-16 15:37 ` Reza Nikoopour
2021-03-16 17:29 ` Stefan Monnier
2021-03-16 17:50 ` Reza Nikoopour
2021-03-24 20:29 ` Filipp Gunbin
2021-03-24 22:10 ` Stefan Monnier
2021-03-24 22:54 ` Filipp Gunbin
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