-;;; syntax.el --- Helper functions to find syntactic context
-
-;; Copyright (C) 2000 Free Software Foundation, Inc.
-
-;; This file is part of GNU Emacs.
-
-;; GNU Emacs is free software; you can redistribute it and/or modify
-;; it under the terms of the GNU General Public License as published by
-;; the Free Software Foundation; either version 2, or (at your option)
-;; any later version.
-
-;; GNU Emacs is distributed in the hope that it will be useful,
-;; but WITHOUT ANY WARRANTY; without even the implied warranty of
-;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-;; GNU General Public License for more details.
-
-;; You should have received a copy of the GNU General Public License
-;; along with GNU Emacs; see the file COPYING. If not, write to the
-;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
-;; Boston, MA 02111-1307, USA.
-
-;;; Commentary:
-
-;; The main exported function is `syntax-ppss'. You might also need
-;; to call `syntax-ppss-after-change-function' or to add it to
-;; after-change-functions'(although this is automatically done by
-;; syntax-ppss when needed, but that might fail if syntax-ppss is
-;; called in a context where after-change-functions is temporarily
-;; let-bound to nil).
-
-;;; Todo:
-
-;; - do something about the case where the syntax-table is changed.
-;; This typically happens with tex-mode and its `$' operator.
-;; - move font-lock-syntactic-keywords in here. Then again, maybe not.
-;; - new functions `syntax-state', ... to replace uses of parse-partial-state
-;; with something higher-level (similar to syntax-ppss-context).
-;; - interaction with mmm-mode.
-;; - what to do when the buffer is narrowed ?
-
-;;; Code:
-
-;; Note: PPSS stands for `parse-partial-sexp state'
-
-(eval-when-compile (require 'cl))
-
-(defsubst syntax-ppss-depth (ppss)
- (nth 0 ppss))
-
-(defsubst syntax-ppss-context (ppss)
- (cond
- ((nth 3 ppss) 'string)
- ((nth 4 ppss) 'comment)
- (t nil)))
-
-(defvar syntax-ppss-max-span 20000
- "Threshold below which cache info is deemed unnecessary.
-We try to make sure that cache entries are at least this far apart
-from each other, to avoid keeping too much useless info.")
-
-(defvar syntax-begin-function nil
- "Function to move back outside of any comment/string/paren.
-This function should move the cursor back to some syntactically safe
-point (where the PPSS is equivalent to nil).")
-
-(defvar syntax-ppss-cache nil
- "List of (POS . PPSS) pairs, in decreasing POS order.")
-(make-variable-buffer-local 'syntax-ppss-cache)
-(defvar syntax-ppss-last nil
- "Cache of (LAST-POS . LAST-PPSS).")
-(make-variable-buffer-local 'syntax-ppss-last)
-
-(defun syntax-ppss-after-change-function (beg &rest ignored)
- ;; Flush invalid cache entries.
- (while (and syntax-ppss-cache (> (caar syntax-ppss-cache) beg))
- (setq syntax-ppss-cache (cdr syntax-ppss-cache)))
- ;; Throw away `last' value if made invalid.
- (when (< beg (or (car syntax-ppss-last) 0))
- (if (< beg (or (car (nth 10 syntax-ppss-last))
- (nth 9 syntax-ppss-last)
- (nth 2 syntax-ppss-last)
- 0))
- (setq syntax-ppss-last nil)
- (setcar syntax-ppss-last nil)))
- ;; Unregister if there's no cache left. Sadly this doesn't work
- ;; because `after-change-functions' is temporarily bound to nil here.
- ;; (unless syntax-ppss-cache
- ;; (remove-hook 'after-change-functions
- ;; 'syntax-ppss-after-change-function t))
- )
-
-(defvar syntax-ppss-stats
- [(0 . 0.0) (0 . 0.0) (0 . 0.0) (0 . 0.0) (0 . 0.0) (1 . 2500.0)])
-(defun syntax-ppss-stats ()
- (mapcar (lambda (x)
- (condition-case nil
- (cons (car x) (truncate (/ (cdr x) (car x))))
- (error nil)))
- syntax-ppss-stats))
-
-;;;###autoload
-(defun syntax-ppss (&optional pos)
- "Parse-Partial-Sexp State at POS.
-The returned value is the same as `parse-partial-sexp' except that
-the 2nd and 6th values of the returned state cannot be relied upon.
-
-If the caller knows the PPSS of a nearby position, she can pass it
-in OLP-PPSS (with or without its corresponding OLD-POS) to try and
-avoid a more expansive scan.
-Point is at POS when this function returns."
- ;; Default values.
- (unless pos (setq pos (point)))
- ;;
- (let ((old-ppss (cdr syntax-ppss-last))
- (old-pos (car syntax-ppss-last))
- (ppss nil)
- (pt-min (point-min)))
- (if (and old-pos (> old-pos pos)) (setq old-pos nil))
- ;; Use the OLD-POS if usable and close. Don't update the `last' cache.
- (if (and old-pos (< (- pos old-pos)
- ;; The time to find PPSS using syntax-begin-function
- ;; is assumed to be about 2 * distance.
- (* 2 (/ (cdr (aref syntax-ppss-stats 5))
- (1+ (car (aref syntax-ppss-stats 5)))))))
- (progn
- (incf (car (aref syntax-ppss-stats 0)))
- (incf (cdr (aref syntax-ppss-stats 0)) (- pos old-pos))
- (parse-partial-sexp old-pos pos nil nil old-ppss))
-
- (cond
- ;; Use OLD-PPSS if possible and close enough.
- ((and (not old-pos) old-ppss
- ;; BEWARE! We rely on the undocumented 9th field.
- ;; The 9th field currently contains the list of positions
- ;; of open-parens of the enclosing parens. I.e. those positions
- ;; are outside of any string/comment and the first of those is
- ;; outside of any paren (i.e. corresponds to a nil ppss).
- ;; If this list is empty but we are in a string or comment,
- ;; then the 8th field contains a similar "toplevel" position.
- ;; If `pt-min' is too far from `pos', we could try to use
- ;; other positions in (nth 9 old-ppss), but that doesn't seem
- ;; to happen in practice and it would complicate this code
- ;; (and the after-change-function code even more). But maybe it
- ;; would be useful in "degenerate" cases such as when the whole
- ;; file is wrapped in a set of parenthesis.
- (setq pt-min (or (car (nth 9 old-ppss))
- (nth 8 old-ppss)
- (nth 2 old-ppss)))
- (<= pt-min pos) (< (- pos pt-min) syntax-ppss-max-span))
- (incf (car (aref syntax-ppss-stats 1)))
- (incf (cdr (aref syntax-ppss-stats 1)) (- pos pt-min))
- (setq ppss (parse-partial-sexp pt-min pos)))
- ;; The OLD-* data can't be used. Consult the cache.
- (t
- (let ((cache-pred nil)
- (cache syntax-ppss-cache)
- (pt-min (point-min))
- ;; I differentiate between PT-MIN and PT-BEST because I feel
- ;; like it might be important to ensure that the cache is only
- ;; filled with 100% sure data (whereas syntax-begin-function
- ;; might return incorrect data). Maybe that's just stupid.
- (pt-best (point-min))
- (ppss-best nil))
- ;; look for a usable cache entry.
- (while (and cache (< pos (caar cache)))
- (setq cache-pred cache)
- (setq cache (cdr cache)))
- (if cache (setq pt-min (caar cache) ppss (cdar cache)))
-
- ;; Setup the after-change function if necessary.
- (unless (or syntax-ppss-cache syntax-ppss-last)
- (add-hook 'after-change-functions
- 'syntax-ppss-after-change-function nil t))
-
- ;; Use the best of OLD-POS and CACHE.
- (if (or (not old-pos) (< old-pos pt-min))
- (setq pt-best pt-min ppss-best ppss)
- (incf (car (aref syntax-ppss-stats 4)))
- (incf (cdr (aref syntax-ppss-stats 4)) (- pos old-pos))
- (setq pt-best old-pos ppss-best old-ppss))
-
- ;; Use the `syntax-begin-function' if available.
- ;; We could try using that function earlier, but:
- ;; - The result might not be 100% reliable, so it's better to use
- ;; the cache if available.
- ;; - The function might be slow.
- ;; - If this function almost always finds a safe nearby spot,
- ;; the cache won't be populated, so consulting it is cheap.
- (unless (or syntax-begin-function
- (not (boundp 'font-lock-beginning-of-syntax-function))
- (not font-lock-beginning-of-syntax-function))
- (set (make-local-variable 'syntax-begin-function)
- font-lock-beginning-of-syntax-function))
- (when (and syntax-begin-function
- (progn (goto-char pos)
- (funcall syntax-begin-function)
- ;; Make sure it's better.
- (> (point) pt-best))
- ;; Simple sanity check.
- (not (memq (get-text-property (point) 'face)
- '(font-lock-string-face font-lock-comment-face
- font-lock-doc-face))))
- (incf (car (aref syntax-ppss-stats 5)))
- (incf (cdr (aref syntax-ppss-stats 5)) (- pos (point)))
- (setq pt-best (point) ppss-best nil))
-
- (cond
- ;; Quick case when we found a nearby pos.
- ((< (- pos pt-best) syntax-ppss-max-span)
- (incf (car (aref syntax-ppss-stats 2)))
- (incf (cdr (aref syntax-ppss-stats 2)) (- pos pt-best))
- (setq ppss (parse-partial-sexp pt-best pos nil nil ppss-best)))
- ;; Slow case: compute the state from some known position and
- ;; populate the cache so we won't need to do it again soon.
- (t
- (incf (car (aref syntax-ppss-stats 3)))
- (incf (cdr (aref syntax-ppss-stats 3)) (- pos pt-min))
-
- ;; If `pt-min' is too far, add a few intermediate entries.
- (while (> (- pos pt-min) (* 2 syntax-ppss-max-span))
- (setq ppss (parse-partial-sexp
- pt-min (setq pt-min (/ (+ pt-min pos) 2))
- nil nil ppss))
- (let ((pair (cons pt-min ppss)))
- (if cache-pred
- (push pair (cdr cache-pred))
- (push pair syntax-ppss-cache))))
-
- ;; Compute the actual return value.
- (setq ppss (parse-partial-sexp pt-min pos nil nil ppss))
-
- ;; Debugging check.
- ;; (let ((real-ppss (parse-partial-sexp (point-min) pos)))
- ;; (setcar (last ppss 4) 0)
- ;; (setcar (last real-ppss 4) 0)
- ;; (setcar (last ppss 8) nil)
- ;; (setcar (last real-ppss 8) nil)
- ;; (unless (equal ppss real-ppss)
- ;; (message "!!Syntax: %s != %s" ppss real-ppss)
- ;; (setq ppss real-ppss)))
-
- ;; Store it in the cache.
- (let ((pair (cons pos ppss)))
- (if cache-pred
- (if (> (- (caar cache-pred) pos) syntax-ppss-max-span)
- (push pair (cdr cache-pred))
- (setcar cache-pred pair))
- (if (or (null syntax-ppss-cache)
- (> (- (caar syntax-ppss-cache) pos)
- syntax-ppss-max-span))
- (push pair syntax-ppss-cache)
- (setcar syntax-ppss-cache pair)))))))))
-
- (setq syntax-ppss-last (cons pos ppss))
- ppss)))
-
-;; Debugging functions
-
-(defun syntax-ppss-debug ()
- (let ((pt nil)
- (min-diffs nil))
- (dolist (x (append syntax-ppss-cache (list (cons (point-min) nil))))
- (when pt (push (- pt (car x)) min-diffs))
- (setq pt (car x)))
- min-diffs))
-
-;; XEmacs compatibility functions
-
-;; (defun buffer-syntactic-context (&optional buffer)
-;; "Syntactic context at point in BUFFER.
-;; Either of `string', `comment' or `nil'.
-;; This is an XEmacs compatibility function."
-;; (with-current-buffer (or buffer (current-buffer))
-;; (syntax-ppss-context (syntax-ppss))))
-
-;; (defun buffer-syntactic-context-depth (&optional buffer)
-;; "Syntactic parenthesis depth at point in BUFFER.
-;; This is an XEmacs compatibility function."
-;; (with-current-buffer (or buffer (current-buffer))
-;; (syntax-ppss-depth (syntax-ppss))))
-
-(defun syntax-after (pos)
- "Return the syntax of the char after POS."
- (unless (or (< pos (point-min)) (>= pos (point-max)))
- (let ((st (if parse-sexp-lookup-properties
- (get-char-property pos 'syntax-table))))
- (if (consp st) st
- (aref (or st (syntax-table)) (char-after pos))))))
-
-(provide 'syntax)
-;;; syntax.el ends here
+;;; syntax.el --- helper functions to find syntactic context
+
+;; Copyright (C) 2000, 2001, 2002, 2003, 2004,
+;; 2005, 2006, 2007 Free Software Foundation, Inc.
+
+;; Maintainer: FSF
+;; Keywords: internal
+
+;; This file is part of GNU Emacs.
+
+;; GNU Emacs is free software; you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published by
+;; the Free Software Foundation; either version 2, or (at your option)
+;; any later version.
+
+;; GNU Emacs is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+;; GNU General Public License for more details.
+
+;; You should have received a copy of the GNU General Public License
+;; along with GNU Emacs; see the file COPYING. If not, write to the
+;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+;; Boston, MA 02110-1301, USA.
+
+;;; Commentary:
+
+;; The main exported function is `syntax-ppss'. You might also need
+;; to call `syntax-ppss-flush-cache' or to add it to
+;; before-change-functions'(although this is automatically done by
+;; syntax-ppss when needed, but that might fail if syntax-ppss is
+;; called in a context where before-change-functions is temporarily
+;; let-bound to nil).
+
+;;; Todo:
+
+;; - do something about the case where the syntax-table is changed.
+;; This typically happens with tex-mode and its `$' operator.
+;; - move font-lock-syntactic-keywords in here. Then again, maybe not.
+;; - new functions `syntax-state', ... to replace uses of parse-partial-state
+;; with something higher-level (similar to syntax-ppss-context).
+;; - interaction with mmm-mode.
+
+;;; Code:
+
+;; Note: PPSS stands for `parse-partial-sexp state'
+
+(eval-when-compile (require 'cl))
+
+(defvar font-lock-beginning-of-syntax-function)
+
+(defsubst syntax-ppss-depth (ppss)
+ (nth 0 ppss))
+
+(defun syntax-ppss-toplevel-pos (ppss)
+ "Get the latest syntactically outermost position found in a syntactic scan.
+PPSS is a scan state, as returned by `partial-parse-sexp' or `syntax-ppss'.
+An \"outermost position\" means one that it is outside of any syntactic entity:
+outside of any parentheses, comments, or strings encountered in the scan.
+If no such position is recorded in PPSS (because the end of the scan was
+itself at the outermost level), return nil."
+ ;; BEWARE! We rely on the undocumented 9th field. The 9th field currently
+ ;; contains the list of positions of the enclosing open-parens.
+ ;; I.e. those positions are outside of any string/comment and the first of
+ ;; those is outside of any paren (i.e. corresponds to a nil ppss).
+ ;; If this list is empty but we are in a string or comment, then the 8th
+ ;; field contains a similar "toplevel" position.
+ (or (car (nth 9 ppss))
+ (nth 8 ppss)))
+
+(defsubst syntax-ppss-context (ppss)
+ (cond
+ ((nth 3 ppss) 'string)
+ ((nth 4 ppss) 'comment)
+ (t nil)))
+
+(defvar syntax-ppss-max-span 20000
+ "Threshold below which cache info is deemed unnecessary.
+We try to make sure that cache entries are at least this far apart
+from each other, to avoid keeping too much useless info.")
+
+(defvar syntax-begin-function nil
+ "Function to move back outside of any comment/string/paren.
+This function should move the cursor back to some syntactically safe
+point (where the PPSS is equivalent to nil).")
+
+(defvar syntax-ppss-cache nil
+ "List of (POS . PPSS) pairs, in decreasing POS order.")
+(make-variable-buffer-local 'syntax-ppss-cache)
+(defvar syntax-ppss-last nil
+ "Cache of (LAST-POS . LAST-PPSS).")
+(make-variable-buffer-local 'syntax-ppss-last)
+
+(defalias 'syntax-ppss-after-change-function 'syntax-ppss-flush-cache)
+(defun syntax-ppss-flush-cache (beg &rest ignored)
+ "Flush the cache of `syntax-ppss' starting at position BEG."
+ ;; Flush invalid cache entries.
+ (while (and syntax-ppss-cache (> (caar syntax-ppss-cache) beg))
+ (setq syntax-ppss-cache (cdr syntax-ppss-cache)))
+ ;; Throw away `last' value if made invalid.
+ (when (< beg (or (car syntax-ppss-last) 0))
+ ;; If syntax-begin-function jumped to BEG, then the old state at BEG can
+ ;; depend on the text after BEG (which is presumably changed). So if
+ ;; BEG=(car (nth 10 syntax-ppss-last)) don't reuse that data because the
+ ;; assumed nil state at BEG may not be valid any more.
+ (if (<= beg (or (syntax-ppss-toplevel-pos (cdr syntax-ppss-last))
+ (nth 3 syntax-ppss-last)
+ 0))
+ (setq syntax-ppss-last nil)
+ (setcar syntax-ppss-last nil)))
+ ;; Unregister if there's no cache left. Sadly this doesn't work
+ ;; because `before-change-functions' is temporarily bound to nil here.
+ ;; (unless syntax-ppss-cache
+ ;; (remove-hook 'before-change-functions 'syntax-ppss-flush-cache t))
+ )
+
+(defvar syntax-ppss-stats
+ [(0 . 0.0) (0 . 0.0) (0 . 0.0) (0 . 0.0) (0 . 0.0) (1 . 2500.0)])
+(defun syntax-ppss-stats ()
+ (mapcar (lambda (x)
+ (condition-case nil
+ (cons (car x) (truncate (/ (cdr x) (car x))))
+ (error nil)))
+ syntax-ppss-stats))
+
+(defun syntax-ppss (&optional pos)
+ "Parse-Partial-Sexp State at POS.
+The returned value is the same as `parse-partial-sexp' except that
+the 2nd and 6th values of the returned state cannot be relied upon.
+Point is at POS when this function returns."
+ ;; Default values.
+ (unless pos (setq pos (point)))
+ ;;
+ (let ((old-ppss (cdr syntax-ppss-last))
+ (old-pos (car syntax-ppss-last))
+ (ppss nil)
+ (pt-min (point-min)))
+ (if (and old-pos (> old-pos pos)) (setq old-pos nil))
+ ;; Use the OLD-POS if usable and close. Don't update the `last' cache.
+ (condition-case nil
+ (if (and old-pos (< (- pos old-pos)
+ ;; The time to use syntax-begin-function and
+ ;; find PPSS is assumed to be about 2 * distance.
+ (* 2 (/ (cdr (aref syntax-ppss-stats 5))
+ (1+ (car (aref syntax-ppss-stats 5)))))))
+ (progn
+ (incf (car (aref syntax-ppss-stats 0)))
+ (incf (cdr (aref syntax-ppss-stats 0)) (- pos old-pos))
+ (parse-partial-sexp old-pos pos nil nil old-ppss))
+
+ (cond
+ ;; Use OLD-PPSS if possible and close enough.
+ ((and (not old-pos) old-ppss
+ ;; If `pt-min' is too far from `pos', we could try to use
+ ;; other positions in (nth 9 old-ppss), but that doesn't
+ ;; seem to happen in practice and it would complicate this
+ ;; code (and the before-change-function code even more).
+ ;; But maybe it would be useful in "degenerate" cases such
+ ;; as when the whole file is wrapped in a set
+ ;; of parentheses.
+ (setq pt-min (or (syntax-ppss-toplevel-pos old-ppss)
+ (nth 2 old-ppss)))
+ (<= pt-min pos) (< (- pos pt-min) syntax-ppss-max-span))
+ (incf (car (aref syntax-ppss-stats 1)))
+ (incf (cdr (aref syntax-ppss-stats 1)) (- pos pt-min))
+ (setq ppss (parse-partial-sexp pt-min pos)))
+ ;; The OLD-* data can't be used. Consult the cache.
+ (t
+ (let ((cache-pred nil)
+ (cache syntax-ppss-cache)
+ (pt-min (point-min))
+ ;; I differentiate between PT-MIN and PT-BEST because
+ ;; I feel like it might be important to ensure that the
+ ;; cache is only filled with 100% sure data (whereas
+ ;; syntax-begin-function might return incorrect data).
+ ;; Maybe that's just stupid.
+ (pt-best (point-min))
+ (ppss-best nil))
+ ;; look for a usable cache entry.
+ (while (and cache (< pos (caar cache)))
+ (setq cache-pred cache)
+ (setq cache (cdr cache)))
+ (if cache (setq pt-min (caar cache) ppss (cdar cache)))
+
+ ;; Setup the before-change function if necessary.
+ (unless (or syntax-ppss-cache syntax-ppss-last)
+ (add-hook 'before-change-functions
+ 'syntax-ppss-flush-cache t t))
+
+ ;; Use the best of OLD-POS and CACHE.
+ (if (or (not old-pos) (< old-pos pt-min))
+ (setq pt-best pt-min ppss-best ppss)
+ (incf (car (aref syntax-ppss-stats 4)))
+ (incf (cdr (aref syntax-ppss-stats 4)) (- pos old-pos))
+ (setq pt-best old-pos ppss-best old-ppss))
+
+ ;; Use the `syntax-begin-function' if available.
+ ;; We could try using that function earlier, but:
+ ;; - The result might not be 100% reliable, so it's better to use
+ ;; the cache if available.
+ ;; - The function might be slow.
+ ;; - If this function almost always finds a safe nearby spot,
+ ;; the cache won't be populated, so consulting it is cheap.
+ (when (and (not syntax-begin-function)
+ (boundp 'font-lock-beginning-of-syntax-function)
+ font-lock-beginning-of-syntax-function)
+ (set (make-local-variable 'syntax-begin-function)
+ font-lock-beginning-of-syntax-function))
+ (when (and syntax-begin-function
+ (progn (goto-char pos)
+ (funcall syntax-begin-function)
+ ;; Make sure it's better.
+ (> (point) pt-best))
+ ;; Simple sanity check.
+ (not (memq (get-text-property (point) 'face)
+ '(font-lock-string-face font-lock-doc-face
+ font-lock-comment-face))))
+ (incf (car (aref syntax-ppss-stats 5)))
+ (incf (cdr (aref syntax-ppss-stats 5)) (- pos (point)))
+ (setq pt-best (point) ppss-best nil))
+
+ (cond
+ ;; Quick case when we found a nearby pos.
+ ((< (- pos pt-best) syntax-ppss-max-span)
+ (incf (car (aref syntax-ppss-stats 2)))
+ (incf (cdr (aref syntax-ppss-stats 2)) (- pos pt-best))
+ (setq ppss (parse-partial-sexp pt-best pos nil nil ppss-best)))
+ ;; Slow case: compute the state from some known position and
+ ;; populate the cache so we won't need to do it again soon.
+ (t
+ (incf (car (aref syntax-ppss-stats 3)))
+ (incf (cdr (aref syntax-ppss-stats 3)) (- pos pt-min))
+
+ ;; If `pt-min' is too far, add a few intermediate entries.
+ (while (> (- pos pt-min) (* 2 syntax-ppss-max-span))
+ (setq ppss (parse-partial-sexp
+ pt-min (setq pt-min (/ (+ pt-min pos) 2))
+ nil nil ppss))
+ (let ((pair (cons pt-min ppss)))
+ (if cache-pred
+ (push pair (cdr cache-pred))
+ (push pair syntax-ppss-cache))))
+
+ ;; Compute the actual return value.
+ (setq ppss (parse-partial-sexp pt-min pos nil nil ppss))
+
+ ;; Debugging check.
+ ;; (let ((real-ppss (parse-partial-sexp (point-min) pos)))
+ ;; (setcar (last ppss 4) 0)
+ ;; (setcar (last real-ppss 4) 0)
+ ;; (setcar (last ppss 8) nil)
+ ;; (setcar (last real-ppss 8) nil)
+ ;; (unless (equal ppss real-ppss)
+ ;; (message "!!Syntax: %s != %s" ppss real-ppss)
+ ;; (setq ppss real-ppss)))
+
+ ;; Store it in the cache.
+ (let ((pair (cons pos ppss)))
+ (if cache-pred
+ (if (> (- (caar cache-pred) pos) syntax-ppss-max-span)
+ (push pair (cdr cache-pred))
+ (setcar cache-pred pair))
+ (if (or (null syntax-ppss-cache)
+ (> (- (caar syntax-ppss-cache) pos)
+ syntax-ppss-max-span))
+ (push pair syntax-ppss-cache)
+ (setcar syntax-ppss-cache pair)))))))))
+
+ (setq syntax-ppss-last (cons pos ppss))
+ ppss)
+ (args-out-of-range
+ ;; If the buffer is more narrowed than when we built the cache,
+ ;; we may end up calling parse-partial-sexp with a position before
+ ;; point-min. In that case, just parse from point-min assuming
+ ;; a nil state.
+ (parse-partial-sexp (point-min) pos)))))
+
+;; Debugging functions
+
+(defun syntax-ppss-debug ()
+ (let ((pt nil)
+ (min-diffs nil))
+ (dolist (x (append syntax-ppss-cache (list (cons (point-min) nil))))
+ (when pt (push (- pt (car x)) min-diffs))
+ (setq pt (car x)))
+ min-diffs))
+
+;; XEmacs compatibility functions
+
+;; (defun buffer-syntactic-context (&optional buffer)
+;; "Syntactic context at point in BUFFER.
+;; Either of `string', `comment' or `nil'.
+;; This is an XEmacs compatibility function."
+;; (with-current-buffer (or buffer (current-buffer))
+;; (syntax-ppss-context (syntax-ppss))))
+
+;; (defun buffer-syntactic-context-depth (&optional buffer)
+;; "Syntactic parenthesis depth at point in BUFFER.
+;; This is an XEmacs compatibility function."
+;; (with-current-buffer (or buffer (current-buffer))
+;; (syntax-ppss-depth (syntax-ppss))))
+
+(provide 'syntax)
+
+;; arch-tag: 302f1eeb-e77c-4680-a8c5-c543e01161a5
+;;; syntax.el ends here
HCoop / bpt / emacs.git / blobdiff