master b60c2a5: Add XInput 2 input method support

[Po Lu]

branch: master
commit b60c2a5d853b0c6478d7182920c39cb2ec96bdc7
Author: Po Lu <luangruo@yahoo.com>
Commit: Po Lu <luangruo@yahoo.com>

    Add XInput 2 input method support
    
    * src/xterm.c (handle_one_xevent): Let input methods filter
    events first before trying to handle an XI2 key press event.
---
 src/xterm.c | 145 ++++++++++++++++++++++++++++++++++++++++++------------------
 1 file changed, 102 insertions(+), 43 deletions(-)

diff --git a/src/xterm.c b/src/xterm.c
index 9e5aed9..6a35b11 100644
--- a/src/xterm.c
+++ b/src/xterm.c
@@ -10350,6 +10350,104 @@ handle_one_xevent (struct x_display_info *dpyinfo,
                    = x_x_to_emacs_modifiers (FRAME_DISPLAY_INFO (f), state);
                  inev.ie.timestamp = xev->time;
 
+#ifdef HAVE_X_I18N
+                 XKeyPressedEvent xkey;
+
+                 memset (&xkey, 0, sizeof xkey);
+
+                 xkey.type = KeyPress;
+                 xkey.serial = 0;
+                 xkey.send_event = xev->send_event;
+                 xkey.display = xev->display;
+                 xkey.window = xev->event;
+                 xkey.root = xev->root;
+                 xkey.subwindow = xev->child;
+                 xkey.time = xev->time;
+                 xkey.state = state;
+                 xkey.keycode = keycode;
+                 xkey.same_screen = True;
+
+                 if (x_filter_event (dpyinfo, (XEvent *) &xkey))
+                   goto xi_done_keysym;
+
+                 if (FRAME_XIC (f))
+                   {
+                     Status status_return;
+                     nbytes = XmbLookupString (FRAME_XIC (f),
+                                               &xkey, (char *) copy_bufptr,
+                                               copy_bufsiz, &keysym,
+                                               &status_return);
+
+                     if (status_return == XBufferOverflow)
+                       {
+                         copy_bufsiz = nbytes + 1;
+                         copy_bufptr = alloca (copy_bufsiz);
+                         nbytes = XmbLookupString (FRAME_XIC (f),
+                                                   &xkey, (char *) copy_bufptr,
+                                                   copy_bufsiz, &keysym,
+                                                   &status_return);
+                       }
+
+                     if (status_return == XLookupNone)
+                       goto xi_done_keysym;
+                     else if (status_return == XLookupChars)
+                       {
+                         keysym = NoSymbol;
+                         state = 0;
+                       }
+                     else if (status_return != XLookupKeySym
+                              && status_return != XLookupBoth)
+                       emacs_abort ();
+                   }
+                 else
+                   {
+#endif
+#ifdef HAVE_XKB
+                     int overflow = 0;
+                     KeySym sym = keysym;
+
+                     if (dpyinfo->xkb_desc)
+                       {
+                         if (!(nbytes = XkbTranslateKeySym (dpyinfo->display, 
&sym,
+                                                            state & 
~mods_rtrn, copy_bufptr,
+                                                            copy_bufsiz, 
&overflow)))
+                           goto XI_OTHER;
+                       }
+                     else
+#else
+                       {
+                         block_input ();
+                         char *str = XKeysymToString (keysym);
+                         if (!str)
+                           {
+                             unblock_input ();
+                             goto XI_OTHER;
+                           }
+                         nbytes = strlen (str) + 1;
+                         copy_bufptr = alloca (nbytes);
+                         strcpy (copy_bufptr, str);
+                         unblock_input ();
+                       }
+#endif
+#ifdef HAVE_XKB
+                     if (overflow)
+                       {
+                         overflow = 0;
+                         copy_bufptr = alloca (copy_bufsiz + overflow);
+                         keysym = sym;
+                         if (!(nbytes = XkbTranslateKeySym (dpyinfo->display, 
&sym,
+                                                            state & 
~mods_rtrn, copy_bufptr,
+                                                            copy_bufsiz + 
overflow, &overflow)))
+                           goto XI_OTHER;
+
+                         if (overflow)
+                           goto XI_OTHER;
+                       }
+#endif
+#ifdef HAVE_X_I18N
+                   }
+#endif
+
                  /* First deal with keysyms which have defined
                     translations to characters.  */
                  if (keysym >= 32 && keysym < 128)
@@ -10466,49 +10564,6 @@ handle_one_xevent (struct x_display_info *dpyinfo,
                      goto xi_done_keysym;
                    }
 
-#ifdef HAVE_XKB
-                 int overflow = 0;
-                 KeySym sym = keysym;
-
-                 if (dpyinfo->xkb_desc)
-                   {
-                     if (!(nbytes = XkbTranslateKeySym (dpyinfo->display, &sym,
-                                                        state & ~mods_rtrn, 
copy_bufptr,
-                                                        copy_bufsiz, 
&overflow)))
-                       goto XI_OTHER;
-                   }
-                 else
-#else
-                   {
-                     block_input ();
-                     char *str = XKeysymToString (keysym);
-                     if (!str)
-                       {
-                         unblock_input ();
-                         goto XI_OTHER;
-                       }
-                     nbytes = strlen (str) + 1;
-                     copy_bufptr = alloca (nbytes);
-                     strcpy (copy_bufptr, str);
-                     unblock_input ();
-                   }
-#endif
-#ifdef HAVE_XKB
-                 if (overflow)
-                   {
-                     overflow = 0;
-                     copy_bufptr = alloca (copy_bufsiz + overflow);
-                     keysym = sym;
-                     if (!(nbytes = XkbTranslateKeySym (dpyinfo->display, &sym,
-                                                        state & ~mods_rtrn, 
copy_bufptr,
-                                                        copy_bufsiz + 
overflow, &overflow)))
-                       goto XI_OTHER;
-
-                     if (overflow)
-                       goto XI_OTHER;
-                   }
-#endif
-
                  for (i = 0, nchars = 0; i < nbytes; i++)
                    {
                      if (ASCII_CHAR_P (copy_bufptr[i]))
@@ -10574,6 +10629,10 @@ handle_one_xevent (struct x_display_info *dpyinfo,
            goto XI_OTHER;
          }
       xi_done_keysym:
+#ifdef HAVE_X_I18N
+       if (FRAME_XIC (f) && (FRAME_XIC_STYLE (f) & XIMStatusArea))
+         xic_set_statusarea (f);
+#endif
        if (must_free_data)
          XFreeEventData (dpyinfo->display, &event->xcookie);
        goto done_keysym;