* custom.texi (Init Examples): Add example of changing load-path.

[emacs.git] / src / menu.c

/* Platform-independent code for terminal communications.
   Copyright (C) 1986, 1988, 1993, 1994, 1996, 1999, 2000, 2001, 2002, 2003,
                 2004, 2005, 2006, 2007, 2008, 2009 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 3 of the License, 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.  If not, see <http://www.gnu.org/licenses/>.  */

#include <config.h>
#include <stdio.h>

#include "lisp.h"
#include "keyboard.h"
#include "keymap.h"
#include "frame.h"
#include "termhooks.h"
#include "blockinput.h"
#include "dispextern.h"

#ifdef USE_X_TOOLKIT
#include "../lwlib/lwlib.h"
#endif

#ifdef HAVE_X_WINDOWS
#include "xterm.h"
#endif

#ifdef HAVE_NS
#include "nsterm.h"
#endif

#ifdef USE_GTK
#include "gtkutil.h"
#endif

#ifdef HAVE_NTGUI
#include "w32term.h"

extern AppendMenuW_Proc unicode_append_menu;

#endif /* HAVE_NTGUI  */

#include "menu.h"

/* Define HAVE_BOXES if menus can handle radio and toggle buttons.  */
#if defined (USE_X_TOOLKIT) || defined (USE_GTK) || defined (HAVE_NTGUI)
#define HAVE_BOXES 1
#endif

extern Lisp_Object QCtoggle, QCradio;

Lisp_Object menu_items;

/* If non-nil, means that the global vars defined here are already in use.
   Used to detect cases where we try to re-enter this non-reentrant code.  */
Lisp_Object menu_items_inuse;

/* Number of slots currently allocated in menu_items.  */
int menu_items_allocated;

/* This is the index in menu_items of the first empty slot.  */
int menu_items_used;

/* The number of panes currently recorded in menu_items,
   excluding those within submenus.  */
int menu_items_n_panes;

/* Current depth within submenus.  */
static int menu_items_submenu_depth;

void
init_menu_items ()
{
  if (!NILP (menu_items_inuse))
    error ("Trying to use a menu from within a menu-entry");

  if (NILP (menu_items))
    {
      menu_items_allocated = 60;
      menu_items = Fmake_vector (make_number (menu_items_allocated), Qnil);
    }

  menu_items_inuse = Qt;
  menu_items_used = 0;
  menu_items_n_panes = 0;
  menu_items_submenu_depth = 0;
}

/* Call at the end of generating the data in menu_items.  */

void
finish_menu_items ()
{
}

Lisp_Object
unuse_menu_items (dummy)
     Lisp_Object dummy;
{
  return menu_items_inuse = Qnil;
}

/* Call when finished using the data for the current menu
   in menu_items.  */

void
discard_menu_items ()
{
  /* Free the structure if it is especially large.
     Otherwise, hold on to it, to save time.  */
  if (menu_items_allocated > 200)
    {
      menu_items = Qnil;
      menu_items_allocated = 0;
    }
  xassert (NILP (menu_items_inuse));
}

/* This undoes save_menu_items, and it is called by the specpdl unwind
   mechanism.  */

static Lisp_Object
restore_menu_items (saved)
     Lisp_Object saved;
{
  menu_items = XCAR (saved);
  menu_items_inuse = (! NILP (menu_items) ? Qt : Qnil);
  menu_items_allocated = (VECTORP (menu_items) ? ASIZE (menu_items) : 0);
  saved = XCDR (saved);
  menu_items_used = XINT (XCAR (saved));
  saved = XCDR (saved);
  menu_items_n_panes = XINT (XCAR (saved));
  saved = XCDR (saved);
  menu_items_submenu_depth = XINT (XCAR (saved));
  return Qnil;
}

/* Push the whole state of menu_items processing onto the specpdl.
   It will be restored when the specpdl is unwound.  */

void
save_menu_items ()
{
  Lisp_Object saved = list4 (!NILP (menu_items_inuse) ? menu_items : Qnil,
                             make_number (menu_items_used),
                             make_number (menu_items_n_panes),
                             make_number (menu_items_submenu_depth));
  record_unwind_protect (restore_menu_items, saved);
  menu_items_inuse = Qnil;
  menu_items = Qnil;
}

\f
/* Make the menu_items vector twice as large.  */

static void
grow_menu_items ()
{
  menu_items_allocated *= 2;
  menu_items = larger_vector (menu_items, menu_items_allocated, Qnil);
}

/* Begin a submenu.  */

static void
push_submenu_start ()
{
  if (menu_items_used + 1 > menu_items_allocated)
    grow_menu_items ();

  XVECTOR (menu_items)->contents[menu_items_used++] = Qnil;
  menu_items_submenu_depth++;
}

/* End a submenu.  */

static void
push_submenu_end ()
{
  if (menu_items_used + 1 > menu_items_allocated)
    grow_menu_items ();

  XVECTOR (menu_items)->contents[menu_items_used++] = Qlambda;
  menu_items_submenu_depth--;
}

/* Indicate boundary between left and right.  */

static void
push_left_right_boundary ()
{
  if (menu_items_used + 1 > menu_items_allocated)
    grow_menu_items ();

  XVECTOR (menu_items)->contents[menu_items_used++] = Qquote;
}

/* Start a new menu pane in menu_items.
   NAME is the pane name.  PREFIX_VEC is a prefix key for this pane.  */

static void
push_menu_pane (name, prefix_vec)
     Lisp_Object name, prefix_vec;
{
  if (menu_items_used + MENU_ITEMS_PANE_LENGTH > menu_items_allocated)
    grow_menu_items ();

  if (menu_items_submenu_depth == 0)
    menu_items_n_panes++;
  XVECTOR (menu_items)->contents[menu_items_used++] = Qt;
  XVECTOR (menu_items)->contents[menu_items_used++] = name;
  XVECTOR (menu_items)->contents[menu_items_used++] = prefix_vec;
}

/* Push one menu item into the current pane.  NAME is the string to
   display.  ENABLE if non-nil means this item can be selected.  KEY
   is the key generated by choosing this item, or nil if this item
   doesn't really have a definition.  DEF is the definition of this
   item.  EQUIV is the textual description of the keyboard equivalent
   for this item (or nil if none).  TYPE is the type of this menu
   item, one of nil, `toggle' or `radio'. */

static void
push_menu_item (name, enable, key, def, equiv, type, selected, help)
     Lisp_Object name, enable, key, def, equiv, type, selected, help;
{
  if (menu_items_used + MENU_ITEMS_ITEM_LENGTH > menu_items_allocated)
    grow_menu_items ();

  XVECTOR (menu_items)->contents[menu_items_used++] = name;
  XVECTOR (menu_items)->contents[menu_items_used++] = enable;
  XVECTOR (menu_items)->contents[menu_items_used++] = key;
  XVECTOR (menu_items)->contents[menu_items_used++] = equiv;
  XVECTOR (menu_items)->contents[menu_items_used++] = def;
  XVECTOR (menu_items)->contents[menu_items_used++] = type;
  XVECTOR (menu_items)->contents[menu_items_used++] = selected;
  XVECTOR (menu_items)->contents[menu_items_used++] = help;
}

/* Args passed between single_keymap_panes and single_menu_item.  */
struct skp
  {
     Lisp_Object pending_maps;
     int maxdepth, notreal;
     int notbuttons;
  };

static void single_menu_item P_ ((Lisp_Object, Lisp_Object, Lisp_Object,
                                  void *));

/* This is a recursive subroutine of keymap_panes.
   It handles one keymap, KEYMAP.
   The other arguments are passed along
   or point to local variables of the previous function.
   If NOTREAL is nonzero, only check for equivalent key bindings, don't
   evaluate expressions in menu items and don't make any menu.

   If we encounter submenus deeper than MAXDEPTH levels, ignore them.  */

static void
single_keymap_panes (keymap, pane_name, prefix, notreal, maxdepth)
     Lisp_Object keymap;
     Lisp_Object pane_name;
     Lisp_Object prefix;
     int notreal;
     int maxdepth;
{
  struct skp skp;
  struct gcpro gcpro1;

  skp.pending_maps = Qnil;
  skp.maxdepth = maxdepth;
  skp.notreal = notreal;
  skp.notbuttons = 0;

  if (maxdepth <= 0)
    return;

  push_menu_pane (pane_name, prefix);

#ifndef HAVE_BOXES
  /* Remember index for first item in this pane so we can go back and
     add a prefix when (if) we see the first button.  After that, notbuttons
     is set to 0, to mark that we have seen a button and all non button
     items need a prefix.  */
  skp.notbuttons = menu_items_used;
#endif

  GCPRO1 (skp.pending_maps);
  map_keymap_canonical (keymap, single_menu_item, Qnil, &skp);
  UNGCPRO;

  /* Process now any submenus which want to be panes at this level.  */
  while (CONSP (skp.pending_maps))
    {
      Lisp_Object elt, eltcdr, string;
      elt = XCAR (skp.pending_maps);
      eltcdr = XCDR (elt);
      string = XCAR (eltcdr);
      /* We no longer discard the @ from the beginning of the string here.
         Instead, we do this in *menu_show.  */
      single_keymap_panes (Fcar (elt), string,
                           XCDR (eltcdr), notreal, maxdepth - 1);
      skp.pending_maps = XCDR (skp.pending_maps);
    }
}

/* This is a subroutine of single_keymap_panes that handles one
   keymap entry.
   KEY is a key in a keymap and ITEM is its binding.
   SKP->PENDING_MAPS_PTR is a list of keymaps waiting to be made into
   separate panes.
   If SKP->NOTREAL is nonzero, only check for equivalent key bindings, don't
   evaluate expressions in menu items and don't make any menu.
   If we encounter submenus deeper than SKP->MAXDEPTH levels, ignore them.  */

static void
single_menu_item (key, item, dummy, skp_v)
     Lisp_Object key, item, dummy;
     void *skp_v;
{
  Lisp_Object map, item_string, enabled;
  struct gcpro gcpro1, gcpro2;
  int res;
  struct skp *skp = skp_v;

  /* Parse the menu item and leave the result in item_properties.  */
  GCPRO2 (key, item);
  res = parse_menu_item (item, skp->notreal, 0);
  UNGCPRO;
  if (!res)
    return;                     /* Not a menu item.  */

  map = XVECTOR (item_properties)->contents[ITEM_PROPERTY_MAP];

  if (skp->notreal)
    {
      /* We don't want to make a menu, just traverse the keymaps to
         precompute equivalent key bindings.  */
      if (!NILP (map))
        single_keymap_panes (map, Qnil, key, 1, skp->maxdepth - 1);
      return;
    }

  enabled = XVECTOR (item_properties)->contents[ITEM_PROPERTY_ENABLE];
  item_string = XVECTOR (item_properties)->contents[ITEM_PROPERTY_NAME];

  if (!NILP (map) && SREF (item_string, 0) == '@')
    {
      if (!NILP (enabled))
        /* An enabled separate pane. Remember this to handle it later.  */
        skp->pending_maps = Fcons (Fcons (map, Fcons (item_string, key)),
                                   skp->pending_maps);
      return;
    }

#if defined(HAVE_X_WINDOWS) || defined(MSDOS)
#ifndef HAVE_BOXES
  /* Simulate radio buttons and toggle boxes by putting a prefix in
     front of them.  */
  {
    Lisp_Object prefix = Qnil;
    Lisp_Object type = XVECTOR (item_properties)->contents[ITEM_PROPERTY_TYPE];
    if (!NILP (type))
      {
        Lisp_Object selected
          = XVECTOR (item_properties)->contents[ITEM_PROPERTY_SELECTED];

        if (skp->notbuttons)
          /* The first button. Line up previous items in this menu.  */
          {
            int index = skp->notbuttons; /* Index for first item this menu.  */
            int submenu = 0;
            Lisp_Object tem;
            while (index < menu_items_used)
              {
                tem
                  = XVECTOR (menu_items)->contents[index + MENU_ITEMS_ITEM_NAME];
                if (NILP (tem))
                  {
                    index++;
                    submenu++;          /* Skip sub menu.  */
                  }
                else if (EQ (tem, Qlambda))
                  {
                    index++;
                    submenu--;          /* End sub menu.  */
                  }
                else if (EQ (tem, Qt))
                  index += 3;           /* Skip new pane marker. */
                else if (EQ (tem, Qquote))
                  index++;              /* Skip a left, right divider. */
                else
                  {
                    if (!submenu && SREF (tem, 0) != '\0'
                        && SREF (tem, 0) != '-')
                      XVECTOR (menu_items)->contents[index + MENU_ITEMS_ITEM_NAME]
                        = concat2 (build_string ("    "), tem);
                    index += MENU_ITEMS_ITEM_LENGTH;
                  }
              }
            skp->notbuttons = 0;
          }

        /* Calculate prefix, if any, for this item.  */
        if (EQ (type, QCtoggle))
          prefix = build_string (NILP (selected) ? "[ ] " : "[X] ");
        else if (EQ (type, QCradio))
          prefix = build_string (NILP (selected) ? "( ) " : "(*) ");
      }
    /* Not a button. If we have earlier buttons, then we need a prefix.  */
    else if (!skp->notbuttons && SREF (item_string, 0) != '\0'
             && SREF (item_string, 0) != '-')
      prefix = build_string ("    ");

    if (!NILP (prefix))
      item_string = concat2 (prefix, item_string);
  }
#endif /* not HAVE_BOXES */

#if ! defined (USE_X_TOOLKIT) && ! defined (USE_GTK)
  if (!NILP (map))
    /* Indicate visually that this is a submenu.  */
    item_string = concat2 (item_string, build_string (" >"));
#endif

#endif /* HAVE_X_WINDOWS || MSDOS */

  push_menu_item (item_string, enabled, key,
                  XVECTOR (item_properties)->contents[ITEM_PROPERTY_DEF],
                  XVECTOR (item_properties)->contents[ITEM_PROPERTY_KEYEQ],
                  XVECTOR (item_properties)->contents[ITEM_PROPERTY_TYPE],
                  XVECTOR (item_properties)->contents[ITEM_PROPERTY_SELECTED],
                  XVECTOR (item_properties)->contents[ITEM_PROPERTY_HELP]);

#if defined (USE_X_TOOLKIT) || defined (USE_GTK) || defined (HAVE_NS) || defined (HAVE_NTGUI)
  /* Display a submenu using the toolkit.  */
  if (! (NILP (map) || NILP (enabled)))
    {
      push_submenu_start ();
      single_keymap_panes (map, Qnil, key, 0, skp->maxdepth - 1);
      push_submenu_end ();
    }
#endif
}

/* Look through KEYMAPS, a vector of keymaps that is NMAPS long,
   and generate menu panes for them in menu_items.
   If NOTREAL is nonzero,
   don't bother really computing whether an item is enabled.  */

void
keymap_panes (keymaps, nmaps, notreal)
     Lisp_Object *keymaps;
     int nmaps;
     int notreal;
{
  int mapno;

  init_menu_items ();

  /* Loop over the given keymaps, making a pane for each map.
     But don't make a pane that is empty--ignore that map instead.
     P is the number of panes we have made so far.  */
  for (mapno = 0; mapno < nmaps; mapno++)
    single_keymap_panes (keymaps[mapno],
                         Fkeymap_prompt (keymaps[mapno]), Qnil, notreal, 10);

  finish_menu_items ();
}


/* Push the items in a single pane defined by the alist PANE.  */
static void
list_of_items (pane)
     Lisp_Object pane;
{
  Lisp_Object tail, item, item1;

  for (tail = pane; CONSP (tail); tail = XCDR (tail))
    {
      item = XCAR (tail);
      if (STRINGP (item))
        push_menu_item (ENCODE_MENU_STRING (item), Qnil, Qnil, Qt,
                        Qnil, Qnil, Qnil, Qnil);
      else if (CONSP (item))
        {
          item1 = XCAR (item);
          CHECK_STRING (item1);
          push_menu_item (ENCODE_MENU_STRING (item1), Qt, XCDR (item),
                          Qt, Qnil, Qnil, Qnil, Qnil);
        }
      else
        push_left_right_boundary ();

    }
}

/* Push all the panes and items of a menu described by the
   alist-of-alists MENU.
   This handles old-fashioned calls to x-popup-menu.  */
void
list_of_panes (menu)
     Lisp_Object menu;
{
  Lisp_Object tail;

  init_menu_items ();

  for (tail = menu; CONSP (tail); tail = XCDR (tail))
    {
      Lisp_Object elt, pane_name, pane_data;
      elt = XCAR (tail);
      pane_name = Fcar (elt);
      CHECK_STRING (pane_name);
      push_menu_pane (ENCODE_MENU_STRING (pane_name), Qnil);
      pane_data = Fcdr (elt);
      CHECK_CONS (pane_data);
      list_of_items (pane_data);
    }

  finish_menu_items ();
}

/* Set up data in menu_items for a menu bar item
   whose event type is ITEM_KEY (with string ITEM_NAME)
   and whose contents come from the list of keymaps MAPS.  */
int
parse_single_submenu (item_key, item_name, maps)
     Lisp_Object item_key, item_name, maps;
{
  Lisp_Object length;
  int len;
  Lisp_Object *mapvec;
  int i;
  int top_level_items = 0;

  length = Flength (maps);
  len = XINT (length);

  /* Convert the list MAPS into a vector MAPVEC.  */
  mapvec = (Lisp_Object *) alloca (len * sizeof (Lisp_Object));
  for (i = 0; i < len; i++)
    {
      mapvec[i] = Fcar (maps);
      maps = Fcdr (maps);
    }

  /* Loop over the given keymaps, making a pane for each map.
     But don't make a pane that is empty--ignore that map instead.  */
  for (i = 0; i < len; i++)
    {
      if (!KEYMAPP (mapvec[i]))
        {
          /* Here we have a command at top level in the menu bar
             as opposed to a submenu.  */
          top_level_items = 1;
          push_menu_pane (Qnil, Qnil);
          push_menu_item (item_name, Qt, item_key, mapvec[i],
                          Qnil, Qnil, Qnil, Qnil);
        }
      else
        {
          Lisp_Object prompt;
          prompt = Fkeymap_prompt (mapvec[i]);
          single_keymap_panes (mapvec[i],
                               !NILP (prompt) ? prompt : item_name,
                               item_key, 0, 10);
        }
    }

  return top_level_items;
}

\f
#if defined (USE_X_TOOLKIT) || defined (USE_GTK) || defined (HAVE_NS) || defined (HAVE_NTGUI)

/* Allocate a widget_value, blocking input.  */

widget_value *
xmalloc_widget_value ()
{
  widget_value *value;

  BLOCK_INPUT;
  value = malloc_widget_value ();
  UNBLOCK_INPUT;

  return value;
}

/* This recursively calls free_widget_value on the tree of widgets.
   It must free all data that was malloc'ed for these widget_values.
   In Emacs, many slots are pointers into the data of Lisp_Strings, and
   must be left alone.  */

void
free_menubar_widget_value_tree (wv)
     widget_value *wv;
{
  if (! wv) return;

  wv->name = wv->value = wv->key = (char *) 0xDEADBEEF;

  if (wv->contents && (wv->contents != (widget_value*)1))
    {
      free_menubar_widget_value_tree (wv->contents);
      wv->contents = (widget_value *) 0xDEADBEEF;
    }
  if (wv->next)
    {
      free_menubar_widget_value_tree (wv->next);
      wv->next = (widget_value *) 0xDEADBEEF;
    }
  BLOCK_INPUT;
  free_widget_value (wv);
  UNBLOCK_INPUT;
}

/* Create a tree of widget_value objects
   representing the panes and items
   in menu_items starting at index START, up to index END.  */

widget_value *
digest_single_submenu (start, end, top_level_items)
     int start, end, top_level_items;
{
  widget_value *wv, *prev_wv, *save_wv, *first_wv;
  int i;
  int submenu_depth = 0;
  widget_value **submenu_stack;
  int panes_seen = 0;

  submenu_stack
    = (widget_value **) alloca (menu_items_used * sizeof (widget_value *));
  wv = xmalloc_widget_value ();
  wv->name = "menu";
  wv->value = 0;
  wv->enabled = 1;
  wv->button_type = BUTTON_TYPE_NONE;
  wv->help = Qnil;
  first_wv = wv;
  save_wv = 0;
  prev_wv = 0;

  /* Loop over all panes and items made by the preceding call
     to parse_single_submenu and construct a tree of widget_value objects.
     Ignore the panes and items used by previous calls to
     digest_single_submenu, even though those are also in menu_items.  */
  i = start;
  while (i < end)
    {
      if (EQ (XVECTOR (menu_items)->contents[i], Qnil))
        {
          submenu_stack[submenu_depth++] = save_wv;
          save_wv = prev_wv;
          prev_wv = 0;
          i++;
        }
      else if (EQ (XVECTOR (menu_items)->contents[i], Qlambda))
        {
          prev_wv = save_wv;
          save_wv = submenu_stack[--submenu_depth];
          i++;
        }
      else if (EQ (XVECTOR (menu_items)->contents[i], Qt)
               && submenu_depth != 0)
        i += MENU_ITEMS_PANE_LENGTH;
      /* Ignore a nil in the item list.
         It's meaningful only for dialog boxes.  */
      else if (EQ (XVECTOR (menu_items)->contents[i], Qquote))
        i += 1;
      else if (EQ (XVECTOR (menu_items)->contents[i], Qt))
        {
          /* Create a new pane.  */
          Lisp_Object pane_name, prefix;
          char *pane_string;

          panes_seen++;

          pane_name = XVECTOR (menu_items)->contents[i + MENU_ITEMS_PANE_NAME];
          prefix = XVECTOR (menu_items)->contents[i + MENU_ITEMS_PANE_PREFIX];

#ifdef HAVE_NTGUI
          if (STRINGP (pane_name))
            {
              if (unicode_append_menu)
                /* Encode as UTF-8 for now.  */
                pane_name = ENCODE_UTF_8 (pane_name);
              else if (STRING_MULTIBYTE (pane_name))
                pane_name = ENCODE_SYSTEM (pane_name);

              ASET (menu_items, i + MENU_ITEMS_PANE_NAME, pane_name);
            }
#elif !defined (HAVE_MULTILINGUAL_MENU)
          if (STRINGP (pane_name) && STRING_MULTIBYTE (pane_name))
            {
              pane_name = ENCODE_MENU_STRING (pane_name);
              ASET (menu_items, i + MENU_ITEMS_PANE_NAME, pane_name);
            }
#endif

          pane_string = (NILP (pane_name)
                         ? "" : (char *) SDATA (pane_name));
          /* If there is just one top-level pane, put all its items directly
             under the top-level menu.  */
          if (menu_items_n_panes == 1)
            pane_string = "";

          /* If the pane has a meaningful name,
             make the pane a top-level menu item
             with its items as a submenu beneath it.  */
          if (strcmp (pane_string, ""))
            {
              wv = xmalloc_widget_value ();
              if (save_wv)
                save_wv->next = wv;
              else
                first_wv->contents = wv;
              wv->lname = pane_name;
              /* Set value to 1 so update_submenu_strings can handle '@'  */
              wv->value = (char *)1;
              wv->enabled = 1;
              wv->button_type = BUTTON_TYPE_NONE;
              wv->help = Qnil;
              save_wv = wv;
            }
          else
            save_wv = first_wv;

          prev_wv = 0;
          i += MENU_ITEMS_PANE_LENGTH;
        }
      else
        {
          /* Create a new item within current pane.  */
          Lisp_Object item_name, enable, descrip, def, type, selected;
          Lisp_Object help;

          /* All items should be contained in panes.  */
          if (panes_seen == 0)
            abort ();

          item_name = AREF (menu_items, i + MENU_ITEMS_ITEM_NAME);
          enable = AREF (menu_items, i + MENU_ITEMS_ITEM_ENABLE);
          descrip = AREF (menu_items, i + MENU_ITEMS_ITEM_EQUIV_KEY);
          def = AREF (menu_items, i + MENU_ITEMS_ITEM_DEFINITION);
          type = AREF (menu_items, i + MENU_ITEMS_ITEM_TYPE);
          selected = AREF (menu_items, i + MENU_ITEMS_ITEM_SELECTED);
          help = AREF (menu_items, i + MENU_ITEMS_ITEM_HELP);

#ifdef HAVE_NTGUI
          if (STRINGP (item_name))
            {
              if (unicode_append_menu)
                item_name = ENCODE_UTF_8 (item_name);
              else if (STRING_MULTIBYTE (item_name))
                item_name = ENCODE_SYSTEM (item_name);

              ASET (menu_items, i + MENU_ITEMS_ITEM_NAME, item_name);
            }

          if (STRINGP (descrip) && STRING_MULTIBYTE (descrip))
            {
              descrip = ENCODE_SYSTEM (descrip);
              ASET (menu_items, i + MENU_ITEMS_ITEM_EQUIV_KEY, descrip);
            }
#elif !defined (HAVE_MULTILINGUAL_MENU)
          if (STRING_MULTIBYTE (item_name))
            {
              item_name = ENCODE_MENU_STRING (item_name);
              ASET (menu_items, i + MENU_ITEMS_ITEM_NAME, item_name);
            }

          if (STRINGP (descrip) && STRING_MULTIBYTE (descrip))
            {
              descrip = ENCODE_MENU_STRING (descrip);
              ASET (menu_items, i + MENU_ITEMS_ITEM_EQUIV_KEY, descrip);
            }
#endif

          wv = xmalloc_widget_value ();
          if (prev_wv)
            prev_wv->next = wv;
          else
            save_wv->contents = wv;

          wv->lname = item_name;
          if (!NILP (descrip))
            wv->lkey = descrip;
          wv->value = 0;
          /* The EMACS_INT cast avoids a warning.  There's no problem
             as long as pointers have enough bits to hold small integers.  */
          wv->call_data = (!NILP (def) ? (void *) (EMACS_INT) i : 0);
          wv->enabled = !NILP (enable);

          if (NILP (type))
            wv->button_type = BUTTON_TYPE_NONE;
          else if (EQ (type, QCradio))
            wv->button_type = BUTTON_TYPE_RADIO;
          else if (EQ (type, QCtoggle))
            wv->button_type = BUTTON_TYPE_TOGGLE;
          else
            abort ();

          wv->selected = !NILP (selected);
          if (! STRINGP (help))
            help = Qnil;

          wv->help = help;

          prev_wv = wv;

          i += MENU_ITEMS_ITEM_LENGTH;
        }
    }

  /* If we have just one "menu item"
     that was originally a button, return it by itself.  */
  if (top_level_items && first_wv->contents && first_wv->contents->next == 0)
    {
      wv = first_wv->contents;
      free_widget_value (first_wv);
      return wv;
    }

  return first_wv;
}

/* Walk through the widget_value tree starting at FIRST_WV and update
   the char * pointers from the corresponding lisp values.
   We do this after building the whole tree, since GC may happen while the
   tree is constructed, and small strings are relocated.  So we must wait
   until no GC can happen before storing pointers into lisp values.  */
void
update_submenu_strings (first_wv)
     widget_value *first_wv;
{
  widget_value *wv;

  for (wv = first_wv; wv; wv = wv->next)
    {
      if (STRINGP (wv->lname))
        {
          wv->name = (char *) SDATA (wv->lname);

          /* Ignore the @ that means "separate pane".
             This is a kludge, but this isn't worth more time.  */
          if (wv->value == (char *)1)
            {
              if (wv->name[0] == '@')
                wv->name++;
              wv->value = 0;
            }
        }

      if (STRINGP (wv->lkey))
        wv->key = (char *) SDATA (wv->lkey);

      if (wv->contents)
        update_submenu_strings (wv->contents);
    }
}

/* Find the menu selection and store it in the keyboard buffer.
   F is the frame the menu is on.
   MENU_BAR_ITEMS_USED is the length of VECTOR.
   VECTOR is an array of menu events for the whole menu.  */

void
find_and_call_menu_selection (f, menu_bar_items_used, vector, client_data)
     FRAME_PTR f;
     int menu_bar_items_used;
     Lisp_Object vector;
     void *client_data;
{
  Lisp_Object prefix, entry;
  Lisp_Object *subprefix_stack;
  int submenu_depth = 0;
  int i;

  entry = Qnil;
  subprefix_stack = (Lisp_Object *) alloca (menu_bar_items_used * sizeof (Lisp_Object));
  prefix = Qnil;
  i = 0;

  while (i < menu_bar_items_used)
    {
      if (EQ (XVECTOR (vector)->contents[i], Qnil))
        {
          subprefix_stack[submenu_depth++] = prefix;
          prefix = entry;
          i++;
        }
      else if (EQ (XVECTOR (vector)->contents[i], Qlambda))
        {
          prefix = subprefix_stack[--submenu_depth];
          i++;
        }
      else if (EQ (XVECTOR (vector)->contents[i], Qt))
        {
          prefix = XVECTOR (vector)->contents[i + MENU_ITEMS_PANE_PREFIX];
          i += MENU_ITEMS_PANE_LENGTH;
        }
      else
        {
          entry = XVECTOR (vector)->contents[i + MENU_ITEMS_ITEM_VALUE];
          /* The EMACS_INT cast avoids a warning.  There's no problem
             as long as pointers have enough bits to hold small integers.  */
          if ((int) (EMACS_INT) client_data == i)
            {
              int j;
              struct input_event buf;
              Lisp_Object frame;
              EVENT_INIT (buf);

              XSETFRAME (frame, f);
              buf.kind = MENU_BAR_EVENT;
              buf.frame_or_window = frame;
              buf.arg = frame;
              kbd_buffer_store_event (&buf);

              for (j = 0; j < submenu_depth; j++)
                if (!NILP (subprefix_stack[j]))
                  {
                    buf.kind = MENU_BAR_EVENT;
                    buf.frame_or_window = frame;
                    buf.arg = subprefix_stack[j];
                    kbd_buffer_store_event (&buf);
                  }

              if (!NILP (prefix))
                {
                  buf.kind = MENU_BAR_EVENT;
                  buf.frame_or_window = frame;
                  buf.arg = prefix;
                  kbd_buffer_store_event (&buf);
                }

              buf.kind = MENU_BAR_EVENT;
              buf.frame_or_window = frame;
              buf.arg = entry;
              kbd_buffer_store_event (&buf);

              return;
            }
          i += MENU_ITEMS_ITEM_LENGTH;
        }
    }
}

#endif /* USE_X_TOOLKIT || USE_GTK || HAVE_NS || HAVE_NTGUI */

#ifdef HAVE_NS
/* As above, but return the menu selection instead of storing in kb buffer.
   If keymaps==1, return full prefixes to selection. */
Lisp_Object
find_and_return_menu_selection (FRAME_PTR f, int keymaps, void *client_data)
{
  Lisp_Object prefix, entry;
  int i;
  Lisp_Object *subprefix_stack;
  int submenu_depth = 0;

  prefix = entry = Qnil;
  i = 0;
  subprefix_stack =
    (Lisp_Object *)alloca(menu_items_used * sizeof (Lisp_Object));

  while (i < menu_items_used)
    {
      if (EQ (XVECTOR (menu_items)->contents[i], Qnil))
        {
          subprefix_stack[submenu_depth++] = prefix;
          prefix = entry;
          i++;
        }
      else if (EQ (XVECTOR (menu_items)->contents[i], Qlambda))
        {
          prefix = subprefix_stack[--submenu_depth];
          i++;
        }
      else if (EQ (XVECTOR (menu_items)->contents[i], Qt))
        {
          prefix
            = XVECTOR (menu_items)->contents[i + MENU_ITEMS_PANE_PREFIX];
          i += MENU_ITEMS_PANE_LENGTH;
        }
      /* Ignore a nil in the item list.
         It's meaningful only for dialog boxes.  */
      else if (EQ (XVECTOR (menu_items)->contents[i], Qquote))
        i += 1;
      else
        {
          entry
            = XVECTOR (menu_items)->contents[i + MENU_ITEMS_ITEM_VALUE];
          if ((int) (EMACS_INT)client_data ==  (int)(&XVECTOR (menu_items)->contents[i]))
            {
              if (keymaps != 0)
                {
                  int j;

                  entry = Fcons (entry, Qnil);
                  if (!NILP (prefix))
                    entry = Fcons (prefix, entry);
                  for (j = submenu_depth - 1; j >= 0; j--)
                    if (!NILP (subprefix_stack[j]))
                      entry = Fcons (subprefix_stack[j], entry);
                }
              return entry;
            }
          i += MENU_ITEMS_ITEM_LENGTH;
        }
    }
  return Qnil;
}
#endif

void
syms_of_menu ()
{
  staticpro (&menu_items);
  menu_items = Qnil;
  menu_items_inuse = Qnil;
}

/* arch-tag: 78bbc7cf-8025-4156-aa8a-6c7fd99bf51d
   (do not change this comment) */