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lang/emacs-lisp: optimize var/face highlighting

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A slight performance improvement in files with a lot of comments and
strings, by skipping ahead a line if in a comment and to the next double
quote if in a string. Otherwise, this function would visit every symbol
in between, and syntax-ppss calls are relatively expensive here.
This commit is contained in:
Henrik Lissner 2019-05-20 20:17:05 -04:00
parent 08bfd5879a
commit 3e15b71568
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GPG key ID: 5F6C0EA160557395
1 changed files with 25 additions and 23 deletions
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14
modules/lang/emacs-lisp/autoload.el
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@ -43,11 +43,13 @@ to a pop up buffer."
Functions are differentiated into special forms, built-in functions and
library/userland functions"
(catch 'matcher
(while (re-search-forward "\\_<.+?\\_>" end t)
(unless (save-excursion
(let ((ppss (syntax-ppss)))
(or (nth 3 ppss) (nth 4 ppss))))
(let ((symbol (intern-soft (match-string-no-properties 0))))
(while (re-search-forward "\\(?:\\sw\\|\\s_\\)+" end t)
(let ((ppss (save-excursion (syntax-ppss))))
(cond ((nth 3 ppss) ; strings
(search-forward "\"" end t))
((nth 4 ppss) ; comments
(forward-line +1))
((let ((symbol (intern-soft (match-string-no-properties 0))))
(and (cond ((null symbol) nil)
((eq symbol t) nil)
((special-variable-p symbol)
@ -65,7 +67,7 @@ library/userland functions"
(if (subrp unaliased)
'font-lock-constant-face
'font-lock-function-name-face))))))
(throw 'matcher t)))))
(throw 'matcher t)))))))
nil))
;;;###autoload