src/keyboard.h

   1 /* Declarations useful when processing input.
   2    Copyright (C) 1985, 1986, 1987, 1993, 2001, 2002, 2003, 2004,
   3                  2005, 2006, 2007, 2008  Free Software Foundation, Inc.
   4
   5 This file is part of GNU Emacs.
   6
   7 GNU Emacs is free software: you can redistribute it and/or modify
   8 it under the terms of the GNU General Public License as published by
   9 the Free Software Foundation, either version 3 of the License, or
  10 (at your option) any later version.
  11
  12 GNU Emacs is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 GNU General Public License for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
  19
  20 #include "systime.h"            /* for EMACS_TIME */
  21 #include "coding.h"             /* for ENCODE_UTF_8 and ENCODE_SYSTEM */
  22
  23 /* Length of echobuf field in each KBOARD.  */
  24
  25 /* Each KBOARD represents one logical input stream from which Emacs
  26    gets input.  If we are using ordinary terminals, it has one KBOARD
  27    object for each terminal device.
  28    Usually each X display screen has its own KBOARD,
  29    but when two of them are on the same X server,
  30    we assume they share a keyboard and give them one KBOARD in common.
  31
  32    Some Lisp variables are per-kboard; they are stored in the KBOARD structure
  33    and accessed indirectly via a Lisp_Misc_Kboard_Objfwd object.
  34
  35    So that definition of keyboard macros, and reading of prefix arguments,
  36    can happen in parallel on various KBOARDs at once,
  37    the state information for those activities is stored in the KBOARD.
  38
  39    Emacs has two states for reading input:
  40
  41    ** Any kboard.  Emacs can accept input from any KBOARD,
  42    and as soon as any of them provides a complete command, Emacs can run it.
  43
  44    ** Single kboard.  Then Emacs is running a command for one KBOARD
  45    and can only read input from that KBOARD.
  46
  47    All input, from all KBOARDs, goes together in a single event queue
  48    at interrupt level.  read_char sees the events sequentially,
  49    but deals with them in accord with the current input state.
  50
  51    In the any-kboard state, read_key_sequence processes input from any KBOARD
  52    immediately.  When a new event comes in from a particular KBOARD,
  53    read_key_sequence switches to that KBOARD.  As a result,
  54    as soon as a complete key arrives from some KBOARD or other,
  55    Emacs starts executing that key's binding.  It switches to the
  56    single-kboard state for the execution of that command,
  57    so that that command can get input only from its own KBOARD.
  58
  59    While in the single-kboard state, read_char can consider input only
  60    from the current KBOARD.  If events come from other KBOARDs, they
  61    are put aside for later in the KBOARDs' kbd_queue lists.
  62    The flag kbd_queue_has_data in a KBOARD is 1 if this has happened.
  63    When Emacs goes back to the any-kboard state, it looks at all the KBOARDs
  64    to find those; and it tries processing their input right away.  */
  65
  66 typedef struct kboard KBOARD;
  67 struct kboard
  68   {
  69     KBOARD *next_kboard;
  70
  71     /* If non-nil, a keymap that overrides all others but applies only to
  72        this KBOARD.  Lisp code that uses this instead of calling read-char
  73        can effectively wait for input in the any-kboard state, and hence
  74        avoid blocking out the other KBOARDs.  See universal-argument in
  75        lisp/simple.el for an example.  */
  76     Lisp_Object Voverriding_terminal_local_map;
  77
  78     /* Last command executed by the editor command loop, not counting
  79        commands that set the prefix argument.  */
  80     Lisp_Object Vlast_command;
  81
  82     /* Normally same as last-command, but never modified by other commands.  */
  83     Lisp_Object Vreal_last_command;
  84
  85     /* User-supplied table to translate input characters through.  */
  86     Lisp_Object Vkeyboard_translate_table;
  87
  88     /* Last command that may be repeated by `repeat'.  */
  89     Lisp_Object Vlast_repeatable_command;
  90
  91     /* The prefix argument for the next command, in raw form.  */
  92     Lisp_Object Vprefix_arg;
  93
  94     /* Saved prefix argument for the last command, in raw form.  */
  95     Lisp_Object Vlast_prefix_arg;
  96
  97     /* Unread events specific to this kboard.  */
  98     Lisp_Object kbd_queue;
  99
 100     /* Non-nil while a kbd macro is being defined.  */
 101     Lisp_Object defining_kbd_macro;
 102
 103     /* The start of storage for the current keyboard macro.  */
 104     Lisp_Object *kbd_macro_buffer;
 105
 106     /* Where to store the next keystroke of the macro.  */
 107     Lisp_Object *kbd_macro_ptr;
 108
 109     /* The finalized section of the macro starts at kbd_macro_buffer and
 110        ends before this.  This is not the same as kbd_macro_ptr, because
 111        we advance this to kbd_macro_ptr when a key's command is complete.
 112        This way, the keystrokes for "end-kbd-macro" are not included in the
 113        macro.  This also allows us to throw away the events added to the
 114        macro by the last command: all the events between kbd_macro_end and
 115        kbd_macro_ptr belong to the last command; see
 116        cancel-kbd-macro-events.  */
 117     Lisp_Object *kbd_macro_end;
 118
 119     /* Allocated size of kbd_macro_buffer.  */
 120     int kbd_macro_bufsize;
 121
 122     /* Last anonymous kbd macro defined.  */
 123     Lisp_Object Vlast_kbd_macro;
 124
 125     /* Alist of system-specific X windows key symbols.  */
 126     Lisp_Object Vsystem_key_alist;
 127
 128     /* Cache for modify_event_symbol.  */
 129     Lisp_Object system_key_syms;
 130
 131     /* The kind of display: x, w32, ...  */
 132     Lisp_Object Vwindow_system;
 133
 134     /* Keymap mapping keys to alternative preferred forms.
 135        See the DEFVAR for more documentation.  */
 136     Lisp_Object Vlocal_function_key_map;
 137
 138     /* Keymap mapping ASCII function key sequences onto their preferred
 139        forms.  Initialized by the terminal-specific lisp files.  See the
 140        DEFVAR for more documentation.  */
 141     Lisp_Object Vinput_decode_map;
 142
 143     /* Minibufferless frames on this display use this frame's minibuffer.  */
 144     Lisp_Object Vdefault_minibuffer_frame;
 145
 146     /* Number of displays using this KBOARD.  Normally 1, but can be
 147        larger when you have multiple screens on a single X display.  */
 148     int reference_count;
 149
 150     /* The text we're echoing in the modeline - partial key sequences,
 151        usually.  This is nil when not echoing.  */
 152     Lisp_Object echo_string;
 153
 154     /* This flag indicates that events were put into kbd_queue
 155        while Emacs was running for some other KBOARD.
 156        The flag means that, when Emacs goes into the any-kboard state again,
 157        it should check this KBOARD to see if there is a complete command
 158        waiting.
 159
 160        Note that the kbd_queue field can be non-nil even when
 161        kbd_queue_has_data is 0.  When we push back an incomplete
 162        command, then this flag is 0, meaning we don't want to try
 163        reading from this KBOARD again until more input arrives.  */
 164     char kbd_queue_has_data;
 165
 166     /* Nonzero means echo each character as typed.  */
 167     char immediate_echo;
 168
 169     /* If we have echoed a prompt string specified by the user,
 170        this is its length in characters.  Otherwise this is -1.  */
 171     char echo_after_prompt;
 172   };
 173
 174 #ifdef MULTI_KBOARD
 175 /* Temporarily used before a frame has been opened. */
 176 extern KBOARD *initial_kboard;
 177
 178 /* In the single-kboard state, this is the kboard
 179    from which input is accepted.
 180
 181    In the any-kboard state, this is the kboard from which we are
 182    right now considering input.  We can consider input from another
 183    kboard, but doing so requires throwing to wrong_kboard_jmpbuf.  */
 184 extern KBOARD *current_kboard;
 185
 186 /* A list of all kboard objects, linked through next_kboard.  */
 187 extern KBOARD *all_kboards;
 188
 189 /* Nonzero in the single-kboard state, 0 in the any-kboard state.  */
 190 extern int single_kboard;
 191 #else
 192 extern KBOARD the_only_kboard;
 193 #define current_kboard (&the_only_kboard)
 194 #define all_kboards (&the_only_kboard)
 195 #define single_kboard 1
 196 #endif
 197 \f
 198 /* Total number of times read_char has returned.  */
 199 extern int num_input_events;
 200
 201 /* Total number of times read_char has returned, outside of macros.  */
 202 extern EMACS_INT num_nonmacro_input_events;
 203
 204 /* Nonzero means polling for input is temporarily suppressed.  */
 205 extern int poll_suppress_count;
 206
 207 /* Vector holding the key sequence that invoked the current command.
 208    It is reused for each command, and it may be longer than the current
 209    sequence; this_command_key_count indicates how many elements
 210    actually mean something.  */
 211 extern Lisp_Object this_command_keys;
 212 extern int this_command_key_count;
 213
 214 /* The frame in which the last input event occurred, or Qmacro if the
 215    last event came from a macro.  We use this to determine when to
 216    generate switch-frame events.  This may be cleared by functions
 217    like Fselect_frame, to make sure that a switch-frame event is
 218    generated by the next character.  */
 219 extern Lisp_Object internal_last_event_frame;
 220 \f
 221 /* Menu items.  */
 222
 223 extern Lisp_Object Vlucid_menu_bar_dirty_flag;
 224 extern Lisp_Object Qrecompute_lucid_menubar, Qactivate_menubar_hook;
 225
 226 /* This holds a Lisp vector that holds the properties of a single
 227    menu item while decoding it in parse_menu_item.
 228    Using a Lisp vector to hold this information while we decode it
 229    takes care of protecting all the data from GC.  */
 230 extern Lisp_Object item_properties;
 231
 232 /* This describes the elements of item_properties.
 233    The first element is not a property, it is a pointer to the item properties
 234    that is saved for GC protection. */
 235 #define ITEM_PROPERTY_ITEM 0
 236 /* The item string.  */
 237 #define ITEM_PROPERTY_NAME 1
 238 /* Start of initialize to nil */
 239 /* The binding: nil, a command or a keymap.  */
 240 #define ITEM_PROPERTY_DEF 2
 241 /* The keymap if the binding is a keymap, otherwise nil.  */
 242 #define ITEM_PROPERTY_MAP 3
 243 /* Nil, :radio or :toggle.  */
 244 #define ITEM_PROPERTY_TYPE 4
 245 /* Nil or a string describing an equivalent key binding.  */
 246 #define ITEM_PROPERTY_KEYEQ 5
 247 /* Not nil if a selected toggle box or radio button, otherwise nil.  */
 248 #define ITEM_PROPERTY_SELECTED 6
 249 /* Place for a help string. Not yet used.  */
 250 #define ITEM_PROPERTY_HELP 7
 251 /* Start of initialize to t */
 252 /* Last property. */
 253 /* Not nil if item is enabled.  */
 254 #define ITEM_PROPERTY_ENABLE 8
 255
 256 /* This holds a Lisp vector that holds the results of decoding
 257    the keymaps or alist-of-alists that specify a menu.
 258
 259    It describes the panes and items within the panes.
 260
 261    Each pane is described by 3 elements in the vector:
 262    t, the pane name, the pane's prefix key.
 263    Then follow the pane's items, with 5 elements per item:
 264    the item string, the enable flag, the item's value,
 265    the definition, and the equivalent keyboard key's description string.
 266
 267    In some cases, multiple levels of menus may be described.
 268    A single vector slot containing nil indicates the start of a submenu.
 269    A single vector slot containing lambda indicates the end of a submenu.
 270    The submenu follows a menu item which is the way to reach the submenu.
 271
 272    A single vector slot containing quote indicates that the
 273    following items should appear on the right of a dialog box.
 274
 275    Using a Lisp vector to hold this information while we decode it
 276    takes care of protecting all the data from GC.  */
 277 extern Lisp_Object menu_items;
 278
 279 /* If non-nil, means that the global vars defined here are already in use.
 280    Used to detect cases where we try to re-enter this non-reentrant code.  */
 281 extern Lisp_Object menu_items_inuse;
 282
 283 /* Number of slots currently allocated in menu_items.  */
 284 extern int menu_items_allocated;
 285
 286 /* This is the index in menu_items of the first empty slot.  */
 287 extern int menu_items_used;
 288
 289 /* The number of panes currently recorded in menu_items,
 290    excluding those within submenus.  */
 291 extern int menu_items_n_panes;
 292
 293 #define MENU_ITEMS_PANE_NAME 1
 294 #define MENU_ITEMS_PANE_PREFIX 2
 295 #define MENU_ITEMS_PANE_LENGTH 3
 296
 297 enum menu_item_idx
 298 {
 299   MENU_ITEMS_ITEM_NAME = 0,
 300   MENU_ITEMS_ITEM_ENABLE,
 301   MENU_ITEMS_ITEM_VALUE,
 302   MENU_ITEMS_ITEM_EQUIV_KEY,
 303   MENU_ITEMS_ITEM_DEFINITION,
 304   MENU_ITEMS_ITEM_TYPE,
 305   MENU_ITEMS_ITEM_SELECTED,
 306   MENU_ITEMS_ITEM_HELP,
 307   MENU_ITEMS_ITEM_LENGTH
 308 };
 309
 310 extern Lisp_Object unuse_menu_items P_ ((Lisp_Object dummy));
 311
 312 /* This is how to deal with multibyte text if HAVE_MULTILINGUAL_MENU
 313    isn't defined.  The use of HAVE_MULTILINGUAL_MENU could probably be
 314    confined to an extended version of this with sections of code below
 315    using it unconditionally.  */
 316 #ifndef HAVE_NTGUI
 317 #if defined (USE_GTK) || defined (HAVE_NS)
 318 # define ENCODE_MENU_STRING(str) ENCODE_UTF_8 (str)
 319 #elif defined HAVE_X_I18N
 320 #define ENCODE_MENU_STRING(str) ENCODE_SYSTEM (str)
 321 #else
 322 #define ENCODE_MENU_STRING(str) string_make_unibyte (str)
 323 #endif /* USE_GTK  */
 324 #else /* HAVE_NTGUI */
 325 #define ENCODE_MENU_STRING(str) (str)
 326 #endif
 327
 328 #if defined (HAVE_NS) || defined (HAVE_NTGUI)
 329
 330 typedef void * XtPointer;
 331 typedef unsigned char Boolean;
 332
 333 /* Definitions copied from lwlib.h */
 334
 335 enum button_type
 336 {
 337   BUTTON_TYPE_NONE,
 338   BUTTON_TYPE_TOGGLE,
 339   BUTTON_TYPE_RADIO
 340 };
 341
 342 /* This structure is based on the one in ../lwlib/lwlib.h, with unused portions
 343    removed.  No term uses these. */
 344 typedef struct _widget_value
 345 {
 346   /* name of widget */
 347   Lisp_Object   lname;
 348   char*         name;
 349   /* value (meaning depend on widget type) */
 350   char*         value;
 351   /* keyboard equivalent. no implications for XtTranslations */
 352   Lisp_Object   lkey;
 353   char*         key;
 354   /* Help string or nil if none.
 355      GC finds this string through the frame's menu_bar_vector
 356      or through menu_items.  */
 357   Lisp_Object   help;
 358   /* true if enabled */
 359   Boolean       enabled;
 360   /* true if selected */
 361   Boolean       selected;
 362   /* The type of a button.  */
 363   enum button_type button_type;
 364 #if defined (HAVE_NTGUI)
 365   /* true if menu title */
 366   Boolean       title;
 367 #endif
 368   /* Contents of the sub-widgets, also selected slot for checkbox */
 369   struct _widget_value* contents;
 370   /* data passed to callback */
 371   XtPointer     call_data;
 372   /* next one in the list */
 373   struct _widget_value* next;
 374 } widget_value;
 375 #endif
 376
 377 \f
 378 /* Macros for dealing with lispy events.  */
 379
 380 /* True if EVENT has data fields describing it (i.e. a mouse click).  */
 381 #define EVENT_HAS_PARAMETERS(event) (CONSP (event))
 382
 383 /* Extract the head from an event.
 384    This works on composite and simple events.  */
 385 #define EVENT_HEAD(event) \
 386   (EVENT_HAS_PARAMETERS (event) ? XCAR (event) : (event))
 387
 388 /* Extract the starting and ending positions from a composite event.  */
 389 #define EVENT_START(event) (XCAR (XCDR (event)))
 390 #define EVENT_END(event) (XCAR (XCDR (XCDR (event))))
 391
 392 /* Extract the click count from a multi-click event.  */
 393 #define EVENT_CLICK_COUNT(event) (Fnth (make_number (2), (event)))
 394
 395 /* Extract the fields of a position.  */
 396 #define POSN_WINDOW(posn) (XCAR (posn))
 397 #define POSN_POSN(posn) (XCAR (XCDR (posn)))
 398 #define POSN_SET_POSN(posn,x) (XSETCAR (XCDR (posn), (x)))
 399 #define POSN_WINDOW_POSN(posn) (XCAR (XCDR (XCDR (posn))))
 400 #define POSN_TIMESTAMP(posn) (XCAR (XCDR (XCDR (XCDR (posn)))))
 401 #define POSN_SCROLLBAR_PART(posn)       (Fnth (make_number (4), (posn)))
 402
 403 /* A cons (STRING . STRING-CHARPOS), or nil in mouse-click events.
 404    It's a cons if the click is over a string in the mode line.  */
 405
 406 #define POSN_STRING(posn) (Fnth (make_number (4), (posn)))
 407
 408 /* If POSN_STRING is nil, event refers to buffer location.  */
 409
 410 #define POSN_INBUFFER_P(posn) (NILP (POSN_STRING (posn)))
 411 #define POSN_BUFFER_POSN(posn) (Fnth (make_number (5), (posn)))
 412
 413 /* Some of the event heads.  */
 414 extern Lisp_Object Qswitch_frame;
 415
 416 /* Properties on event heads.  */
 417 extern Lisp_Object Qevent_kind, Qevent_symbol_elements;
 418
 419 /* Getting an unmodified version of an event head.  */
 420 #define EVENT_HEAD_UNMODIFIED(event_head) \
 421   (Fcar (Fget ((event_head), Qevent_symbol_elements)))
 422
 423 /* The values of Qevent_kind properties.  */
 424 extern Lisp_Object Qfunction_key, Qmouse_click, Qmouse_movement;
 425 extern Lisp_Object Qscroll_bar_movement;
 426
 427 /* Getting the kind of an event head.  */
 428 #define EVENT_HEAD_KIND(event_head) \
 429   (Fget ((event_head), Qevent_kind))
 430
 431 /* Symbols to use for non-text mouse positions.  */
 432 extern Lisp_Object Qmode_line, Qvertical_line, Qheader_line;
 433
 434 /* Forward declaration for prototypes.  */
 435 struct input_event;
 436
 437 extern Lisp_Object parse_modifiers P_ ((Lisp_Object));
 438 extern Lisp_Object reorder_modifiers P_ ((Lisp_Object));
 439 extern Lisp_Object read_char P_ ((int, int, Lisp_Object *, Lisp_Object,
 440                                   int *, EMACS_TIME *));
 441
 442
 443 /* Parent keymap of terminal-local function-key-map instances.  */
 444 extern Lisp_Object Vfunction_key_map;
 445
 446 /* Keymap of key translations that can override keymaps.  */
 447 extern Lisp_Object Vkey_translation_map;
 448
 449 extern int parse_menu_item P_ ((Lisp_Object, int, int));
 450
 451 extern void echo_now P_ ((void));
 452 extern void init_kboard P_ ((KBOARD *));
 453 extern void delete_kboard P_ ((KBOARD *));
 454 extern void not_single_kboard_state P_ ((KBOARD *));
 455 extern void push_kboard P_ ((struct kboard *));
 456 extern void push_frame_kboard P_ ((struct frame *));
 457 extern void pop_kboard P_ ((void));
 458 extern void temporarily_switch_to_single_kboard P_ ((struct frame *));
 459 extern void record_asynch_buffer_change P_ ((void));
 460 extern SIGTYPE input_poll_signal P_ ((int));
 461 extern void start_polling P_ ((void));
 462 extern void stop_polling P_ ((void));
 463 extern void set_poll_suppress_count P_ ((int));
 464 extern void gobble_input P_ ((int));
 465 extern int input_polling_used P_ ((void));
 466 extern void clear_input_pending P_ ((void));
 467 extern int requeued_events_pending_p P_ ((void));
 468 extern void bind_polling_period P_ ((int));
 469 extern void stuff_buffered_input P_ ((Lisp_Object));
 470 extern void clear_waiting_for_input P_ ((void));
 471 extern void swallow_events P_ ((int));
 472 extern int help_char_p P_ ((Lisp_Object));
 473 extern void quit_throw_to_read_char P_ ((void)) NO_RETURN;
 474 extern void cmd_error_internal P_ ((Lisp_Object, char *));
 475 extern int lucid_event_type_list_p P_ ((Lisp_Object));
 476 extern void kbd_buffer_store_event P_ ((struct input_event *));
 477 extern void kbd_buffer_store_event_hold P_ ((struct input_event *,
 478                                              struct input_event *));
 479 extern void kbd_buffer_unget_event P_ ((struct input_event *));
 480 #ifdef POLL_FOR_INPUT
 481 extern void poll_for_input_1 P_ ((void));
 482 #endif
 483 extern void show_help_echo P_ ((Lisp_Object, Lisp_Object, Lisp_Object,
 484                                 Lisp_Object, int));
 485 extern void gen_help_event P_ ((Lisp_Object, Lisp_Object, Lisp_Object,
 486                                Lisp_Object, int));
 487 extern void kbd_buffer_store_help_event P_ ((Lisp_Object, Lisp_Object));
 488 extern Lisp_Object menu_item_eval_property P_ ((Lisp_Object));
 489 extern int  kbd_buffer_events_waiting P_ ((int));
 490 extern void add_user_signals P_ ((int, const char *));
 491
 492 extern int tty_read_avail_input P_ ((struct terminal *, int,
 493                                      struct input_event *));
 494
 495 /* arch-tag: 769cbade-1ba9-4950-b886-db265b061aa3
 496    (do not change this comment) */