Commit 2f600e97 authored by Paul Eggert's avatar Paul Eggert

Avoid crashes when casifying noncontiguous regions

This is a followon fix for Bug#37477.
* lisp/simple.el (region-extract-function):
Use setq here, since the var is now defined in C code.
* src/casefiddle.c (casify_pnc_region): New function.
(Fupcase_region, Fdowncase_region, Fcapitalize_region)
(Fupcase_initials_region): Use it.
(Fupcase_initials_region): Add region-noncontiguous-p flag
for consistency with the others.  All uses changed.
(syms_of_casefiddle): Define Qbounds, Vregion_extract_function.
* src/insdel.c (prepare_to_modify_buffer_1):
* src/keyboard.c (command_loop_1):
Use Vregion_extraction_function.
* src/insdel.c (syms_of_insdel): No need to define
Qregion_extract_function.
* test/src/casefiddle-tests.el (casefiddle-oldfunc): New var.
(casefiddle-loopfunc, casefiddle-badfunc): New functions.
(casefiddle-invalid-region-extract-function): New test.
parent dddff96a
Pipeline #3257 failed with stage
in 54 minutes and 14 seconds
......@@ -488,7 +488,8 @@ interface that's more like functions like 'search-forward'.
---
** More commands support noncontiguous rectangular regions, namely
'upcase-dwim', 'downcase-dwim', 'capitalize-dwim', 'capitalize-region',
'replace-string', 'replace-regexp', and 'delimit-columns-region'.
'upcase-initials-region', 'replace-string', 'replace-regexp', and
'delimit-columns-region'.
+++
** When asked to visit a large file, Emacs now offers visiting it literally.
......
......@@ -1087,7 +1087,7 @@ instead of deleted."
:group 'killing
:version "24.1")
(defvar region-extract-function
(setq region-extract-function
(lambda (method)
(when (region-beginning)
(cond
......@@ -1096,19 +1096,7 @@ instead of deleted."
((eq method 'delete-only)
(delete-region (region-beginning) (region-end)))
(t
(filter-buffer-substring (region-beginning) (region-end) method)))))
"Function to get the region's content.
Called with one argument METHOD which can be:
- nil: return the content as a string (list of strings for
non-contiguous regions).
- `delete-only': delete the region; the return value is undefined.
- `bounds': return the boundaries of the region as a list of one
or more cons cells of the form (START . END).
- anything else: delete the region and return its content
as a string (or list of strings for non-contiguous regions),
after filtering it with `filter-buffer-substring', which
is called, for each contiguous sub-region, with METHOD as its
3rd argument.")
(filter-buffer-substring (region-beginning) (region-end) method))))))
(defvar region-insert-function
(lambda (lines)
......
......@@ -516,34 +516,43 @@ casify_region (enum case_action flag, Lisp_Object b, Lisp_Object e)
return orig_end + added;
}
DEFUN ("upcase-region", Fupcase_region, Supcase_region, 2, 3,
"(list (region-beginning) (region-end) (region-noncontiguous-p))",
doc: /* Convert the region to upper case. In programs, wants two arguments.
These arguments specify the starting and ending character numbers of
the region to operate on. When used as a command, the text between
point and the mark is operated on.
See also `capitalize-region'. */)
(Lisp_Object beg, Lisp_Object end, Lisp_Object region_noncontiguous_p)
{
Lisp_Object bounds = Qnil;
/* Casify a possibly noncontiguous region according to FLAG. BEG and
END specify the bounds, except that if REGION_NONCONTIGUOUS_P is
non-nil, the region's bounds are specified by (funcall
region-extract-function 'bounds) instead. */
static Lisp_Object
casify_pnc_region (enum case_action flag, Lisp_Object beg, Lisp_Object end,
Lisp_Object region_noncontiguous_p)
{
if (!NILP (region_noncontiguous_p))
{
bounds = call1 (Fsymbol_value (Qregion_extract_function),
intern ("bounds"));
while (CONSP (bounds))
Lisp_Object bounds = call1 (Vregion_extract_function, Qbounds);
FOR_EACH_TAIL (bounds)
{
casify_region (CASE_UP, XCAR (XCAR (bounds)), XCDR (XCAR (bounds)));
bounds = XCDR (bounds);
CHECK_CONS (XCAR (bounds));
casify_region (flag, XCAR (XCAR (bounds)), XCDR (XCAR (bounds)));
}
CHECK_LIST_END (bounds, bounds);
}
else
casify_region (CASE_UP, beg, end);
casify_region (flag, beg, end);
return Qnil;
}
DEFUN ("upcase-region", Fupcase_region, Supcase_region, 2, 3,
"(list (region-beginning) (region-end) (region-noncontiguous-p))",
doc: /* Convert the region to upper case. In programs, wants two arguments.
These arguments specify the starting and ending character numbers of
the region to operate on. When used as a command, the text between
point and the mark is operated on.
See also `capitalize-region'. */)
(Lisp_Object beg, Lisp_Object end, Lisp_Object region_noncontiguous_p)
{
return casify_pnc_region (CASE_UP, beg, end, region_noncontiguous_p);
}
DEFUN ("downcase-region", Fdowncase_region, Sdowncase_region, 2, 3,
"(list (region-beginning) (region-end) (region-noncontiguous-p))",
doc: /* Convert the region to lower case. In programs, wants two arguments.
......@@ -552,23 +561,7 @@ the region to operate on. When used as a command, the text between
point and the mark is operated on. */)
(Lisp_Object beg, Lisp_Object end, Lisp_Object region_noncontiguous_p)
{
Lisp_Object bounds = Qnil;
if (!NILP (region_noncontiguous_p))
{
bounds = call1 (Fsymbol_value (Qregion_extract_function),
intern ("bounds"));
while (CONSP (bounds))
{
casify_region (CASE_DOWN, XCAR (XCAR (bounds)), XCDR (XCAR (bounds)));
bounds = XCDR (bounds);
}
}
else
casify_region (CASE_DOWN, beg, end);
return Qnil;
return casify_pnc_region (CASE_DOWN, beg, end, region_noncontiguous_p);
}
DEFUN ("capitalize-region", Fcapitalize_region, Scapitalize_region, 2, 3,
......@@ -580,38 +573,23 @@ In programs, give two arguments, the starting and ending
character positions to operate on. */)
(Lisp_Object beg, Lisp_Object end, Lisp_Object region_noncontiguous_p)
{
Lisp_Object bounds = Qnil;
if (!NILP (region_noncontiguous_p))
{
bounds = call1 (Fsymbol_value (Qregion_extract_function),
intern ("bounds"));
while (CONSP (bounds))
{
casify_region (CASE_CAPITALIZE, XCAR (XCAR (bounds)), XCDR (XCAR (bounds)));
bounds = XCDR (bounds);
}
}
else
casify_region (CASE_CAPITALIZE, beg, end);
return Qnil;
return casify_pnc_region (CASE_CAPITALIZE, beg, end, region_noncontiguous_p);
}
/* Like Fcapitalize_region but change only the initials. */
DEFUN ("upcase-initials-region", Fupcase_initials_region,
Supcase_initials_region, 2, 2, "r",
Supcase_initials_region, 2, 3,
"(list (region-beginning) (region-end) (region-noncontiguous-p))",
doc: /* Upcase the initial of each word in the region.
This means that each word's first character is converted to either
title case or upper case, and the rest are left unchanged.
In programs, give two arguments, the starting and ending
character positions to operate on. */)
(Lisp_Object beg, Lisp_Object end)
(Lisp_Object beg, Lisp_Object end, Lisp_Object region_noncontiguous_p)
{
casify_region (CASE_CAPITALIZE_UP, beg, end);
return Qnil;
return casify_pnc_region (CASE_CAPITALIZE_UP, beg, end,
region_noncontiguous_p);
}
static Lisp_Object
......@@ -668,12 +646,28 @@ With negative argument, capitalize previous words but do not move. */)
void
syms_of_casefiddle (void)
{
DEFSYM (Qbounds, "bounds");
DEFSYM (Qidentity, "identity");
DEFSYM (Qtitlecase, "titlecase");
DEFSYM (Qspecial_uppercase, "special-uppercase");
DEFSYM (Qspecial_lowercase, "special-lowercase");
DEFSYM (Qspecial_titlecase, "special-titlecase");
DEFVAR_LISP ("region-extract-function", Vregion_extract_function,
doc: /* Function to get the region's content.
Called with one argument METHOD which can be:
- nil: return the content as a string (list of strings for
non-contiguous regions).
- `delete-only': delete the region; the return value is undefined.
- `bounds': return the boundaries of the region as a list of one
or more cons cells of the form (START . END).
- anything else: delete the region and return its content
as a string (or list of strings for non-contiguous regions),
after filtering it with `filter-buffer-substring', which
is called, for each contiguous sub-region, with METHOD as its
3rd argument. */);
Vregion_extract_function = Qnil; /* simple.el sets this. */
defsubr (&Supcase);
defsubr (&Sdowncase);
defsubr (&Scapitalize);
......
......@@ -2002,7 +2002,7 @@ prepare_to_modify_buffer_1 (ptrdiff_t start, ptrdiff_t end,
: (!NILP (Vselect_active_regions)
&& !NILP (Vtransient_mark_mode))))
Vsaved_region_selection
= call1 (Fsymbol_value (Qregion_extract_function), Qnil);
= call1 (Vregion_extract_function, Qnil);
signal_before_change (start, end, preserve_ptr);
Fset (Qdeactivate_mark, Qt);
......@@ -2401,7 +2401,5 @@ handling of the active region per `select-active-regions'. */);
inhibit_modification_hooks = 0;
DEFSYM (Qinhibit_modification_hooks, "inhibit-modification-hooks");
DEFSYM (Qregion_extract_function, "region-extract-function");
defsubr (&Scombine_after_change_execute);
}
......@@ -1535,7 +1535,7 @@ command_loop_1 (void)
Vselection_inhibit_update_commands)))
{
Lisp_Object txt
= call1 (Fsymbol_value (Qregion_extract_function), Qnil);
= call1 (Vregion_extract_function, Qnil);
if (XFIXNUM (Flength (txt)) > 0)
/* Don't set empty selections. */
call2 (Qgui_set_selection, QPRIMARY, txt);
......
......@@ -2739,7 +2739,7 @@ since only regular expressions have distinguished subexpressions. */)
Qnil);
else if (case_action == cap_initial)
Fupcase_initials_region (make_fixnum (search_regs.start[sub]),
make_fixnum (newpoint));
make_fixnum (newpoint), Qnil);
/* The replace_range etc. functions can trigger modification hooks
(see signal_before_change and signal_after_change). Try to error
......
......@@ -259,5 +259,22 @@
(should (eq tc (capitalize ch)))
(should (eq tc (upcase-initials ch))))))
(defvar casefiddle-oldfunc region-extract-function)
(defun casefiddle-loopfunc (method)
(if (eq method 'bounds)
(let ((looping (list '(1 . 1))))
(setcdr looping looping))
(funcall casefiddle-oldfunc method)))
(defun casefiddle-badfunc (method)
(if (eq method 'bounds)
'(())
(funcall casefiddle-oldfunc method)))
(ert-deftest casefiddle-invalid-region-extract-function ()
(dolist (region-extract-function '(casefiddle-badfunc casefiddle-loopfunc))
(with-temp-buffer
(should-error (upcase-region nil nil t)))))
;;; casefiddle-tests.el ends here
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