Commit 52f8ec73 authored by Jim Blandy's avatar Jim Blandy

* lisp.h (Lisp_Overlay): New tag.

	(OVERLAYP): New predicate.
	(CHECK_OVERLAY): New type-checker.
	(Qoverlayp): New extern declaration.
	* buffer.c (Foverlayp): New function.
	(Qoverlayp): New atom.
	(overlays_at, recenter_overlay_lists): Abort if we encounter an
	invalid overlay.
	(syms_of_buffer): defsubr Soverlayp; initialize Qoverlayp.
	(Fdelete_overlay): Set the overlay's markers to point nowhere.
	Use CHECK_OVERLAY instead of signalling a special error.
	(Fmove_overlay, Foverlay_put): Use CHECK_OVERLAY instead of
	signalling a special error.
	(Foverlay_get): Use CHECK_OVERLAY.
	* fns.c (internal_equal): Define this for overlays.
	* buffer.h (OVERLAY_VALID): Define in terms of OVERLAYP.
	* print.c (print): Give overlays their own print syntax.
	* alloc.c (mark_object): Treat overlays like conses.

	* buffer.c (Foverlay_get): Return Qnil if the requested property
	is missing from the property list.
parent d855a603
......@@ -124,6 +124,8 @@ Lisp_Object QSFundamental; /* A string "Fundamental" */
Lisp_Object Qkill_buffer_hook;
Lisp_Object Qoverlayp;
/* For debugging; temporary. See set_buffer_internal. */
/* Lisp_Object Qlisp_mode, Vcheck_symbol; */
......@@ -1196,7 +1198,8 @@ a non-nil `permanent-local' property are not eliminated by this function.")
/* Find all the overlays in the current buffer that contain position POS.
Return the number found, and store them in a vector in *VEC_PTR.
Store in *LEN_PTR the size allocated for the vector.
Store in *NEXT_PTR the next position after POS where an overlay starts.
Store in *NEXT_PTR the next position after POS where an overlay starts,
or ZV if there are no more overlays.
*VEC_PTR and *LEN_PTR should contain a valid vector and size
when this function is called. */
......@@ -1213,15 +1216,15 @@ overlays_at (pos, vec_ptr, len_ptr, next_ptr)
int len = *len_ptr;
Lisp_Object *vec = *vec_ptr;
int next = ZV;
int startpos;
for (tail = current_buffer->overlays_before;
CONSP (tail);
tail = XCONS (tail)->cdr)
{
int startpos;
overlay = XCONS (tail)->car;
if (! OVERLAY_VALID (overlay))
continue;
abort ();
start = OVERLAY_START (overlay);
end = OVERLAY_END (overlay);
......@@ -1246,20 +1249,22 @@ overlays_at (pos, vec_ptr, len_ptr, next_ptr)
CONSP (tail);
tail = XCONS (tail)->cdr)
{
int startpos;
overlay = XCONS (tail)->car;
if (! OVERLAY_VALID (overlay))
continue;
abort ();
start = OVERLAY_START (overlay);
end = OVERLAY_END (overlay);
startpos = OVERLAY_POSITION (start);
if (startpos > pos)
if (pos < startpos)
{
if (startpos < next)
next = startpos;
break;
}
if (OVERLAY_POSITION (end) > pos)
if (pos < OVERLAY_POSITION (end))
{
if (idx == len)
{
......@@ -1299,6 +1304,9 @@ recenter_overlay_lists (buf, pos)
/* If the overlay is not valid, get rid of it. */
if (!OVERLAY_VALID (overlay))
#if 1
abort ();
#else
{
/* Splice the cons cell TAIL out of overlays_before. */
if (!NILP (prev))
......@@ -1308,6 +1316,7 @@ recenter_overlay_lists (buf, pos)
tail = prev;
continue;
}
#endif
beg = OVERLAY_START (overlay);
end = OVERLAY_END (overlay);
......@@ -1335,7 +1344,7 @@ recenter_overlay_lists (buf, pos)
otheroverlay = XCONS (other)->car;
if (! OVERLAY_VALID (otheroverlay))
continue;
abort ();
otherbeg = OVERLAY_START (otheroverlay);
if (OVERLAY_POSITION (otherbeg) >= where)
......@@ -1368,6 +1377,9 @@ recenter_overlay_lists (buf, pos)
/* If the overlay is not valid, get rid of it. */
if (!OVERLAY_VALID (overlay))
#if 1
abort ();
#else
{
/* Splice the cons cell TAIL out of overlays_after. */
if (!NILP (prev))
......@@ -1377,6 +1389,7 @@ recenter_overlay_lists (buf, pos)
tail = prev;
continue;
}
#endif
beg = OVERLAY_START (overlay);
end = OVERLAY_END (overlay);
......@@ -1409,7 +1422,7 @@ recenter_overlay_lists (buf, pos)
otheroverlay = XCONS (other)->car;
if (! OVERLAY_VALID (otheroverlay))
continue;
abort ();
otherend = OVERLAY_END (otheroverlay);
if (OVERLAY_POSITION (otherend) <= where)
......@@ -1429,6 +1442,14 @@ recenter_overlay_lists (buf, pos)
XFASTINT (buf->overlay_center) = pos;
}
DEFUN ("overlayp", Foverlayp, Soverlayp, 1, 1, 0,
"Return t if OBJECT is an overlay.")
(object)
Lisp_Object object;
{
return (OVERLAYP (object) ? Qt : Qnil);
}
DEFUN ("make-overlay", Fmake_overlay, Smake_overlay, 2, 3, 0,
"Create a new overlay with range BEG to END in BUFFER.\n\
If omitted, BUFFER defaults to the current buffer.\n\
......@@ -1465,6 +1486,7 @@ BEG and END may be integers or markers.")
end = Fset_marker (Fmake_marker (), end, buffer);
overlay = Fcons (Fcons (beg, end), Qnil);
XSETTYPE (overlay, Lisp_Overlay);
/* Put the new overlay on the wrong list. */
end = OVERLAY_END (overlay);
......@@ -1490,13 +1512,10 @@ If BUFFER is omitted, leave OVERLAY in the same buffer it inhabits now.")
{
struct buffer *b;
if (!OVERLAY_VALID (overlay))
error ("Invalid overlay object");
CHECK_OVERLAY (overlay, 0);
if (NILP (buffer))
buffer = Fmarker_buffer (OVERLAY_START (overlay));
CHECK_BUFFER (buffer, 3);
CHECK_NUMBER_COERCE_MARKER (beg, 1);
CHECK_NUMBER_COERCE_MARKER (end, 1);
......@@ -1555,15 +1574,16 @@ DEFUN ("delete-overlay", Fdelete_overlay, Sdelete_overlay, 1, 1, 0,
{
struct buffer *b;
if (OVERLAY_VALID (overlay))
b = XBUFFER (Fmarker_buffer (OVERLAY_START (overlay)));
else
/* Guess! */
b = current_buffer;
CHECK_OVERLAY (overlay, 0);
b = XBUFFER (Fmarker_buffer (OVERLAY_START (overlay)));
b->overlays_before = Fdelq (overlay, b->overlays_before);
b->overlays_after = Fdelq (overlay, b->overlays_after);
Fset_marker (OVERLAY_START (overlay), 1, Qnil);
Fset_marker (OVERLAY_END (overlay), 1, Qnil);
redisplay_region (b,
OVERLAY_POSITION (OVERLAY_START (overlay)),
OVERLAY_POSITION (OVERLAY_END (overlay)));
......@@ -1677,13 +1697,18 @@ DEFUN ("overlay-get", Foverlay_get, Soverlay_get, 2, 2, 0,
Lisp_Object overlay, prop;
{
Lisp_Object plist;
for (plist = Fcdr_safe (Fcdr_safe (overlay));
CHECK_OVERLAY (overlay, 0);
for (plist = Fcdr_safe (XCONS (overlay)->cdr);
CONSP (plist) && CONSP (XCONS (plist)->cdr);
plist = XCONS (XCONS (plist)->cdr)->cdr)
{
if (EQ (XCONS (plist)->car, prop))
return XCONS (XCONS (plist)->cdr)->car;
}
return Qnil;
}
DEFUN ("overlay-put", Foverlay_put, Soverlay_put, 3, 3, 0,
......@@ -1693,14 +1718,13 @@ DEFUN ("overlay-put", Foverlay_put, Soverlay_put, 3, 3, 0,
{
Lisp_Object plist, tail;
if (!OVERLAY_VALID (overlay))
error ("Invalid overlay object");
CHECK_OVERLAY (overlay, 0);
redisplay_region (XMARKER (OVERLAY_START (overlay))->buffer,
OVERLAY_POSITION (OVERLAY_START (overlay)),
OVERLAY_POSITION (OVERLAY_END (overlay)));
plist = Fcdr_safe (Fcdr_safe (overlay));
plist = Fcdr_safe (XCONS (overlay)->cdr);
for (tail = plist;
CONSP (tail) && CONSP (XCONS (tail)->cdr);
......@@ -1892,6 +1916,9 @@ syms_of_buffer ()
staticpro (&Qprotected_field);
staticpro (&Qpermanent_local);
staticpro (&Qkill_buffer_hook);
staticpro (&Qoverlayp);
Qoverlayp = intern ("overlayp");
Fput (Qprotected_field, Qerror_conditions,
Fcons (Qprotected_field, Fcons (Qerror, Qnil)));
......@@ -2215,6 +2242,7 @@ Automatically local in all buffers.");
defsubr (&Slist_buffers);
defsubr (&Skill_all_local_variables);
defsubr (&Soverlayp);
defsubr (&Smake_overlay);
defsubr (&Sdelete_overlay);
defsubr (&Smove_overlay);
......
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