records the restriction bounds that were current when the first
labeled restriction was entered (which may be a narrowing that was
set by the user and is visible on display). This alist is used
- internally by narrow-to-region, widen, internal--label-restriction,
- internal--unlabel-restriction and save-restriction. For efficiency
- reasons, an alist is used instead of a buffer-local variable:
- otherwise reset_outermost_restrictions, which is called during each
- redisplay cycle, would have to loop through all live buffers. */
+ internally by narrow-to-region, internal--labeled-narrow-to-region,
+ widen, internal--unlabel-restriction and save-restriction. For
+ efficiency reasons, an alist is used instead of a buffer-local
+ variable: otherwise reset_outermost_restrictions, which is called
+ during each redisplay cycle, would have to loop through all live
+ buffers. */
static Lisp_Object labeled_restrictions;
/* Add BUF with its list of labeled RESTRICTIONS in the
`without-restriction' with the same label. */)
(void)
{
- Fset (Qoutermost_restriction, Qnil);
Lisp_Object buf = Fcurrent_buffer ();
Lisp_Object label = labeled_restrictions_peek_label (buf);
return Qnil;
}
-DEFUN ("internal--label-restriction", Finternal__label_restriction,
- Sinternal__label_restriction, 1, 1, 0,
- doc: /* Label the current restriction with LABEL.
+DEFUN ("internal--labeled-narrow-to-region", Finternal__labeled_narrow_to_region,
+ Sinternal__labeled_narrow_to_region, 3, 3, 0,
+ doc: /* Restrict editing in this buffer to START-END, and label the restriction with LABEL.
This is an internal function used by `with-restriction'. */)
- (Lisp_Object label)
+ (Lisp_Object start, Lisp_Object end, Lisp_Object label)
{
Lisp_Object buf = Fcurrent_buffer ();
- Lisp_Object outermost_restriction
- = buffer_local_value (Qoutermost_restriction, buf);
- /* If internal--label-restriction is ever called without being
- preceded by narrow-to-region, do nothing. */
- if (NILP (outermost_restriction))
- return Qnil;
+ Lisp_Object outermost_restriction = list3 (Qoutermost_restriction,
+ Fpoint_min_marker (),
+ Fpoint_max_marker ());
+ Fnarrow_to_region (start, end);
if (NILP (labeled_restrictions_peek_label (buf)))
labeled_restrictions_push (buf, outermost_restriction);
labeled_restrictions_push (buf, list3 (label,
return Qnil;
}
-DEFUN ("internal--labeled-narrow-to-region", Finternal__labeled_narrow_to_region,
- Sinternal__labeled_narrow_to_region, 3, 3, 0,
- doc: /* Restrict editing to START-END, and label the restriction with LABEL.
-
-This is an internal function used by `with-restriction'. */)
- (Lisp_Object start, Lisp_Object end, Lisp_Object label)
-{
- /* Record the accessible range of the buffer when narrow-to-region
- is called, that is, before applying the narrowing. That
- information is used only by internal--label-restriction. */
- Fset (Qoutermost_restriction, list3 (Qoutermost_restriction,
- Fpoint_min_marker (),
- Fpoint_max_marker ()));
- Fnarrow_to_region (start, end);
- Finternal__label_restriction (label);
- return Qnil;
-}
-
DEFUN ("internal--unlabel-restriction", Finternal__unlabel_restriction,
Sinternal__unlabel_restriction, 1, 1, 0,
doc: /* If the current restriction is labeled with LABEL, remove its label.
it to be non-nil. */);
binary_as_unsigned = false;
- DEFVAR_LISP ("outermost-restriction", Voutermost_restriction,
- doc: /* Outermost narrowing bounds, if any. Internal use only. */);
- Voutermost_restriction = Qnil;
- Fmake_variable_buffer_local (Qoutermost_restriction);
DEFSYM (Qoutermost_restriction, "outermost-restriction");
Funintern (Qoutermost_restriction, Qnil);
defsubr (&Sdelete_and_extract_region);
defsubr (&Swiden);
defsubr (&Snarrow_to_region);
- defsubr (&Sinternal__label_restriction);
defsubr (&Sinternal__labeled_narrow_to_region);
defsubr (&Sinternal__unlabel_restriction);
defsubr (&Ssave_restriction);