[Emacs-diffs] Changes to emacs/lisp/emacs-lisp/syntax.el,v

[Stefan Monnier]

CVSROOT:        /sources/emacs
Module name:    emacs
Changes by:     Stefan Monnier <monnier>        06/12/18 14:34:02

Index: emacs-lisp/syntax.el
===================================================================
RCS file: /sources/emacs/emacs/lisp/emacs-lisp/syntax.el,v
retrieving revision 1.20
retrieving revision 1.21
diff -u -b -r1.20 -r1.21
--- emacs-lisp/syntax.el        18 Dec 2006 14:02:30 -0000      1.20
+++ emacs-lisp/syntax.el        18 Dec 2006 14:34:01 -0000      1.21
@@ -59,6 +59,12 @@
 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)))      
 
@@ -97,8 +103,7 @@
     ;; 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 (car (nth 10 syntax-ppss-last))
-                    (nth 9 syntax-ppss-last)
+    (if (<= beg (or (syntax-ppss-toplevel-pos (cdr syntax-ppss-last))
                     (nth 3 syntax-ppss-last)
                     0))
        (setq syntax-ppss-last nil)
@@ -146,22 +151,14 @@
          (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
-                ;; 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 parenthesis.
-                (setq pt-min (or (car (nth 9 old-ppss))
-                                 (nth 8 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)))