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* lisp/emacs-lisp/syntax.el: Use syntax-ppss-table for syntax-propertize.

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`syntax-ppss` uses `syntax-ppss-table` while parsing the buffer as well
as when it calls `syntax-propertize`, but `syntax-propertize` can also
be called directly rather than via `syntax-ppss` so it needs to explicitly
use `syntax-ppss-table` as well in order to avoid using sometimes one
table and sometimes another.

(syntax-ppss-table): Move before new use.
(syntax-propertize): Use it.
This commit is contained in:
Stefan Monnier 2019-06-04 21:48:06 -04:00
parent ca7b6a4451
commit 0b3982b1a3
1 changed files with 40 additions and 39 deletions
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79
lisp/emacs-lisp/syntax.el
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@ -283,6 +283,9 @@ END) suitable for `syntax-propertize-function'."
;; In case it was eval'd/compiled.
(setq keywords font-lock-syntactic-keywords)))))
(defvar-local syntax-ppss-table nil
"Syntax-table to use during `syntax-ppss', if any.")
(defun syntax-propertize (pos)
"Ensure that syntax-table properties are set until POS (a buffer point)."
(when (< syntax-propertize--done pos)
@ -301,47 +304,48 @@ END) suitable for `syntax-propertize-function'."
#'syntax-ppss-flush-cache 99 t))
(save-excursion
(with-silent-modifications
(make-local-variable 'syntax-propertize--done) ;Just in case!
(let* ((start (max (min syntax-propertize--done (point-max))
(point-min)))
(end (max pos
(min (point-max)
(+ start syntax-propertize-chunk-size))))
(funs syntax-propertize-extend-region-functions))
(while funs
(let ((new (funcall (pop funs) start end))
;; Avoid recursion!
(syntax-propertize--done most-positive-fixnum))
(if (or (null new)
(and (>= (car new) start) (<= (cdr new) end)))
nil
(setq start (car new))
(setq end (cdr new))
;; If there's been a change, we should go through the
;; list again since this new position may
;; warrant a different answer from one of the funs we've
;; already seen.
(unless (eq funs
(cdr syntax-propertize-extend-region-functions))
(setq funs syntax-propertize-extend-region-functions)))))
;; Flush ppss cache between the original value of `start' and that
;; set above by syntax-propertize-extend-region-functions.
(syntax-ppss-flush-cache start)
;; Move the limit before calling the function, so the function
;; can use syntax-ppss.
(setq syntax-propertize--done end)
;; (message "syntax-propertizing from %s to %s" start end)
(remove-text-properties start end
'(syntax-table nil syntax-multiline nil))
;; Avoid recursion!
(let ((syntax-propertize--done most-positive-fixnum))
(funcall syntax-propertize-function start end))))))))
(with-syntax-table syntax-ppss-table
(make-local-variable 'syntax-propertize--done) ;Just in case!
(let* ((start (max (min syntax-propertize--done (point-max))
(point-min)))
(end (max pos
(min (point-max)
(+ start syntax-propertize-chunk-size))))
(funs syntax-propertize-extend-region-functions))
(while funs
(let ((new (funcall (pop funs) start end))
;; Avoid recursion!
(syntax-propertize--done most-positive-fixnum))
(if (or (null new)
(and (>= (car new) start) (<= (cdr new) end)))
nil
(setq start (car new))
(setq end (cdr new))
;; If there's been a change, we should go through the
;; list again since this new position may
;; warrant a different answer from one of the funs we've
;; already seen.
(unless (eq funs
(cdr syntax-propertize-extend-region-functions))
(setq funs syntax-propertize-extend-region-functions)))))
;; Flush ppss cache between the original value of `start' and that
;; set above by syntax-propertize-extend-region-functions.
(syntax-ppss-flush-cache start)
;; Move the limit before calling the function, so the function
;; can use syntax-ppss.
(setq syntax-propertize--done end)
;; (message "syntax-propertizing from %s to %s" start end)
(remove-text-properties start end
'(syntax-table nil syntax-multiline nil))
;; Avoid recursion!
(let ((syntax-propertize--done most-positive-fixnum))
(funcall syntax-propertize-function start end)))))))))
;;; Link syntax-propertize with syntax.c.
(defvar syntax-propertize-chunks
;; We're not sure how far we'll go. In my tests, using chunks of 2000
;; brings to overhead to something negligible. Passing ‘charpos’ directly
;; brings the overhead to something negligible. Passing ‘charpos’ directly
;; also works (basically works line-by-line) but results in an overhead which
;; I thought was a bit too high (like around 50%).
2000)
@ -450,9 +454,6 @@ These are valid when the buffer has no restriction.")
(cl-incf (car pair))
(cl-incf (cdr pair) (- new old))))
(defvar-local syntax-ppss-table nil
"Syntax-table to use during `syntax-ppss', if any.")
(defun syntax-ppss--data ()
(if (eq (point-min) 1)
(progn