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284f4730 | 1 | /* Declarations useful when processing input. |
0b5538bd | 2 | Copyright (C) 1985, 1986, 1987, 1993, 2002, 2003, 2004, |
aaef169d | 3 | 2005, 2006 Free Software Foundation, Inc. |
284f4730 JB |
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 | |
e5d77022 | 9 | the Free Software Foundation; either version 2, or (at your option) |
284f4730 JB |
10 | 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; see the file COPYING. If not, write to | |
4fc5845f LK |
19 | the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, |
20 | Boston, MA 02110-1301, USA. */ | |
284f4730 | 21 | |
931e7866 RS |
22 | /* Length of echobuf field in each KBOARD. */ |
23 | ||
931e7866 RS |
24 | /* Each KBOARD represents one logical input stream from which Emacs gets input. |
25 | If we are using an ordinary terminal, it has one KBOARD object. | |
26 | Usually each X display screen has its own KBOARD, | |
27 | but when two of them are on the same X server, | |
28 | we assume they share a keyboard and give them one KBOARD in common. | |
29 | ||
30 | Some Lisp variables are per-kboard; they are stored in the KBOARD structure | |
31 | and accessed indirectly via a Lisp_Misc_Kboard_Objfwd object. | |
32 | ||
33 | So that definition of keyboard macros, and reading of prefix arguments, | |
34 | can happen in parallel on various KBOARDs at once, | |
35 | the state information for those activities is stored in the KBOARD. | |
36 | ||
37 | Emacs has two states for reading input: | |
38 | ||
39 | ** Any kboard. Emacs can accept input from any KBOARD, | |
40 | and as soon as any of them provides a complete command, Emacs can run it. | |
41 | ||
42 | ** Single kboard. Then Emacs is running a command for one KBOARD | |
43 | and can only read input from that KBOARD. | |
44 | ||
45 | All input, from all KBOARDs, goes together in a single event queue | |
46 | at interrupt level. read_char sees the events sequentially, | |
47 | but deals with them in accord with the current input state. | |
48 | ||
49 | In the any-kboard state, read_key_sequence processes input from any KBOARD | |
50 | immediately. When a new event comes in from a particular KBOARD, | |
51 | read_key_sequence switches to that KBOARD. As a result, | |
52 | as soon as a complete key arrives from some KBOARD or other, | |
53 | Emacs starts executing that key's binding. It switches to the | |
54 | single-kboard state for the execution of that command, | |
55 | so that that command can get input only from its own KBOARD. | |
56 | ||
57 | While in the single-kboard state, read_char can consider input only | |
58 | from the current KBOARD. If events come from other KBOARDs, they | |
59 | are put aside for later in the KBOARDs' kbd_queue lists. | |
60 | The flag kbd_queue_has_data in a KBOARD is 1 if this has happened. | |
df631feb | 61 | When Emacs goes back to the any-kboard state, it looks at all the KBOARDs |
931e7866 RS |
62 | to find those; and it tries processing their input right away. */ |
63 | ||
64 | typedef struct kboard KBOARD; | |
65 | struct kboard | |
66 | { | |
67 | KBOARD *next_kboard; | |
68 | ||
063c96e6 KH |
69 | /* If non-nil, a keymap that overrides all others but applies only to |
70 | this KBOARD. Lisp code that uses this instead of calling read-char | |
71 | can effectively wait for input in the any-kboard state, and hence | |
72 | avoid blocking out the other KBOARDs. See universal-argument in | |
73 | lisp/simple.el for an example. */ | |
74 | Lisp_Object Voverriding_terminal_local_map; | |
75 | ||
334a398c KH |
76 | /* Last command executed by the editor command loop, not counting |
77 | commands that set the prefix argument. */ | |
78 | Lisp_Object Vlast_command; | |
79 | ||
d94a2d9a RS |
80 | /* Normally same as last-command, but never modified by |
81 | other commands. */ | |
82 | Lisp_Object Vreal_last_command; | |
83 | ||
7e926407 KH |
84 | /* The prefix argument for the next command, in raw form. */ |
85 | Lisp_Object Vprefix_arg; | |
d94a2d9a RS |
86 | |
87 | /* Saved prefix argument for the last command, in raw form. */ | |
88 | Lisp_Object Vlast_prefix_arg; | |
931e7866 RS |
89 | |
90 | /* Unread events specific to this kboard. */ | |
91 | Lisp_Object kbd_queue; | |
92 | ||
93 | /* Non-nil while a kbd macro is being defined. */ | |
94 | Lisp_Object defining_kbd_macro; | |
95 | ||
96 | /* The start of storage for the current keyboard macro. */ | |
97 | Lisp_Object *kbd_macro_buffer; | |
98 | ||
99 | /* Where to store the next keystroke of the macro. */ | |
100 | Lisp_Object *kbd_macro_ptr; | |
101 | ||
102 | /* The finalized section of the macro starts at kbd_macro_buffer and | |
103 | ends before this. This is not the same as kbd_macro_ptr, because | |
104 | we advance this to kbd_macro_ptr when a key's command is complete. | |
105 | This way, the keystrokes for "end-kbd-macro" are not included in the | |
70564478 EZ |
106 | macro. This also allows us to throw away the events added to the |
107 | macro by the last command: all the events between kbd_macro_end and | |
108 | kbd_macro_ptr belong to the last command; see | |
109 | cancel-kbd-macro-events. */ | |
931e7866 RS |
110 | Lisp_Object *kbd_macro_end; |
111 | ||
112 | /* Allocated size of kbd_macro_buffer. */ | |
113 | int kbd_macro_bufsize; | |
114 | ||
115 | /* Last anonymous kbd macro defined. */ | |
116 | Lisp_Object Vlast_kbd_macro; | |
117 | ||
be2f0083 KH |
118 | /* Alist of system-specific X windows key symbols. */ |
119 | Lisp_Object Vsystem_key_alist; | |
120 | ||
8955bab8 KH |
121 | /* Cache for modify_event_symbol. */ |
122 | Lisp_Object system_key_syms; | |
123 | ||
2db45b7b KH |
124 | /* Minibufferless frames on this display use this frame's minibuffer. */ |
125 | Lisp_Object Vdefault_minibuffer_frame; | |
126 | ||
931e7866 RS |
127 | /* Number of displays using this KBOARD. Normally 1, but can be |
128 | larger when you have multiple screens on a single X display. */ | |
129 | int reference_count; | |
130 | ||
931e7866 | 131 | /* The text we're echoing in the modeline - partial key sequences, |
a35bdffa GM |
132 | usually. This is nil when not echoing. */ |
133 | Lisp_Object echo_string; | |
931e7866 RS |
134 | |
135 | /* This flag indicates that events were put into kbd_queue | |
136 | while Emacs was running for some other KBOARD. | |
137 | The flag means that, when Emacs goes into the any-kboard state again, | |
138 | it should check this KBOARD to see if there is a complete command | |
139 | waiting. | |
140 | ||
141 | Note that the kbd_queue field can be non-nil even when | |
142 | kbd_queue_has_data is 0. When we push back an incomplete | |
143 | command, then this flag is 0, meaning we don't want to try | |
144 | reading from this KBOARD again until more input arrives. */ | |
145 | char kbd_queue_has_data; | |
146 | ||
147 | /* Nonzero means echo each character as typed. */ | |
148 | char immediate_echo; | |
149 | ||
150 | /* If we have echoed a prompt string specified by the user, | |
a35bdffa | 151 | this is its length in characters. Otherwise this is -1. */ |
931e7866 RS |
152 | char echo_after_prompt; |
153 | }; | |
154 | ||
155 | #ifdef MULTI_KBOARD | |
156 | /* Temporarily used before a frame has been opened, and for termcap frames */ | |
157 | extern KBOARD *initial_kboard; | |
158 | ||
159 | /* In the single-kboard state, this is the kboard | |
160 | from which input is accepted. | |
161 | ||
162 | In the any-kboard state, this is the kboard from which we are | |
163 | right now considering input. We can consider input from another | |
164 | kboard, but doing so requires throwing to wrong_kboard_jmpbuf. */ | |
165 | extern KBOARD *current_kboard; | |
166 | ||
167 | /* A list of all kboard objects, linked through next_kboard. */ | |
168 | extern KBOARD *all_kboards; | |
169 | ||
170 | /* Nonzero in the single-kboard state, 0 in the any-kboard state. */ | |
171 | extern int single_kboard; | |
172 | #else | |
173 | extern KBOARD the_only_kboard; | |
174 | #define current_kboard (&the_only_kboard) | |
175 | #define all_kboards (&the_only_kboard) | |
176 | #define single_kboard 1 | |
177 | #endif | |
178 | \f | |
18afd477 KH |
179 | extern Lisp_Object Vlucid_menu_bar_dirty_flag; |
180 | extern Lisp_Object Qrecompute_lucid_menubar, Qactivate_menubar_hook; | |
181 | ||
284f4730 | 182 | /* Total number of times read_char has returned. */ |
6c747f30 | 183 | extern int num_input_events; |
284f4730 | 184 | |
0ca96cef | 185 | /* Total number of times read_char has returned, outside of macros. */ |
31ade731 | 186 | extern EMACS_INT num_nonmacro_input_events; |
0ca96cef | 187 | |
eb8c3be9 | 188 | /* Nonzero means polling for input is temporarily suppressed. */ |
284f4730 JB |
189 | extern int poll_suppress_count; |
190 | ||
191 | /* Keymap mapping ASCII function key sequences onto their preferred forms. | |
192 | Initialized by the terminal-specific lisp files. */ | |
193 | extern Lisp_Object Vfunction_key_map; | |
194 | ||
49fcd3de JB |
195 | /* Vector holding the key sequence that invoked the current command. |
196 | It is reused for each command, and it may be longer than the current | |
197 | sequence; this_command_key_count indicates how many elements | |
198 | actually mean something. */ | |
199 | extern Lisp_Object this_command_keys; | |
200 | extern int this_command_key_count; | |
6084b314 | 201 | |
fd2777e0 JB |
202 | /* The frame in which the last input event occurred, or Qmacro if the |
203 | last event came from a macro. We use this to determine when to | |
204 | generate switch-frame events. This may be cleared by functions | |
205 | like Fselect_frame, to make sure that a switch-frame event is | |
206 | generated by the next character. */ | |
9e6314a4 | 207 | extern Lisp_Object internal_last_event_frame; |
284f4730 | 208 | \f |
0340dc60 RS |
209 | /* This holds a Lisp vector that holds the properties of a single |
210 | menu item while decoding it in parse_menu_item. | |
211 | Using a Lisp vector to hold this information while we decode it | |
212 | takes care of protecting all the data from GC. */ | |
213 | extern Lisp_Object item_properties; | |
177c0ea7 | 214 | |
0340dc60 RS |
215 | /* This describes the elements of item_properties. |
216 | The first element is not a property, it is a pointer to the item properties | |
217 | that is saved for GC protection. */ | |
218 | #define ITEM_PROPERTY_ITEM 0 | |
219 | /* The item string. */ | |
220 | #define ITEM_PROPERTY_NAME 1 | |
df631feb | 221 | /* Start of initialize to nil */ |
0340dc60 RS |
222 | /* The binding: nil, a command or a keymap. */ |
223 | #define ITEM_PROPERTY_DEF 2 | |
224 | /* The keymap if the binding is a keymap, otherwise nil. */ | |
225 | #define ITEM_PROPERTY_MAP 3 | |
226 | /* Nil, :radio or :toggle. */ | |
227 | #define ITEM_PROPERTY_TYPE 4 | |
228 | /* Nil or a string describing an equivalent key binding. */ | |
229 | #define ITEM_PROPERTY_KEYEQ 5 | |
230 | /* Not nil if a selected toggle box or radio button, otherwise nil. */ | |
231 | #define ITEM_PROPERTY_SELECTED 6 | |
232 | /* Place for a help string. Not yet used. */ | |
233 | #define ITEM_PROPERTY_HELP 7 | |
df631feb | 234 | /* Start of initialize to t */ |
0340dc60 RS |
235 | /* Last property. */ |
236 | /* Not nil if item is enabled. */ | |
237 | #define ITEM_PROPERTY_ENABLE 8 | |
238 | \f | |
284f4730 JB |
239 | /* Macros for dealing with lispy events. */ |
240 | ||
241 | /* True iff EVENT has data fields describing it (i.e. a mouse click). */ | |
4a2fb8bd | 242 | #define EVENT_HAS_PARAMETERS(event) (CONSP (event)) |
284f4730 | 243 | |
53ce28d6 JB |
244 | /* Extract the head from an event. |
245 | This works on composite and simple events. */ | |
ac501cd9 | 246 | #define EVENT_HEAD(event) \ |
3331fb06 | 247 | (EVENT_HAS_PARAMETERS (event) ? XCAR (event) : (event)) |
ac501cd9 | 248 | |
53ce28d6 | 249 | /* Extract the starting and ending positions from a composite event. */ |
3331fb06 KR |
250 | #define EVENT_START(event) (XCAR (XCDR (event))) |
251 | #define EVENT_END(event) (XCAR (XCDR (XCDR (event)))) | |
ac501cd9 | 252 | |
6765e5b0 | 253 | /* Extract the click count from a multi-click event. */ |
1365f343 | 254 | #define EVENT_CLICK_COUNT(event) (Fnth (make_number (2), (event))) |
6765e5b0 | 255 | |
53ce28d6 | 256 | /* Extract the fields of a position. */ |
3331fb06 | 257 | #define POSN_WINDOW(posn) (XCAR (posn)) |
03c975a4 KS |
258 | #define POSN_POSN(posn) (XCAR (XCDR (posn))) |
259 | #define POSN_SET_POSN(posn,x) (XSETCAR (XCDR (posn), (x))) | |
3331fb06 | 260 | #define POSN_WINDOW_POSN(posn) (XCAR (XCDR (XCDR (posn)))) |
03c975a4 | 261 | #define POSN_TIMESTAMP(posn) (XCAR (XCDR (XCDR (XCDR (posn))))) |
1365f343 | 262 | #define POSN_SCROLLBAR_PART(posn) (Fnth (make_number (4), (posn))) |
284f4730 | 263 | |
6e0adcfa GM |
264 | /* A cons (STRING . STRING-CHARPOS), or nil in mouse-click events. |
265 | It's a cons if the click is over a string in the mode line. */ | |
266 | ||
03c975a4 KS |
267 | #define POSN_STRING(posn) (Fnth (make_number (4), (posn))) |
268 | ||
269 | /* If POSN_STRING is nil, event refers to buffer location. */ | |
270 | ||
271 | #define POSN_INBUFFER_P(posn) (NILP (POSN_STRING (posn))) | |
272 | #define POSN_BUFFER_POSN(posn) (Fnth (make_number (5), (posn))) | |
6e0adcfa | 273 | |
284f4730 | 274 | /* Some of the event heads. */ |
6084b314 | 275 | extern Lisp_Object Qswitch_frame; |
284f4730 JB |
276 | |
277 | /* Properties on event heads. */ | |
ac501cd9 | 278 | extern Lisp_Object Qevent_kind, Qevent_symbol_elements; |
284f4730 JB |
279 | |
280 | /* Getting an unmodified version of an event head. */ | |
281 | #define EVENT_HEAD_UNMODIFIED(event_head) \ | |
ac501cd9 | 282 | (Fcar (Fget ((event_head), Qevent_symbol_elements))) |
284f4730 JB |
283 | |
284 | /* The values of Qevent_kind properties. */ | |
285 | extern Lisp_Object Qfunction_key, Qmouse_click, Qmouse_movement; | |
fd2777e0 | 286 | extern Lisp_Object Qscroll_bar_movement; |
284f4730 JB |
287 | |
288 | /* Getting the kind of an event head. */ | |
289 | #define EVENT_HEAD_KIND(event_head) \ | |
290 | (Fget ((event_head), Qevent_kind)) | |
291 | ||
292 | /* Symbols to use for non-text mouse positions. */ | |
045dee35 | 293 | extern Lisp_Object Qmode_line, Qvertical_line, Qheader_line; |
284f4730 | 294 | |
d748a3db AS |
295 | /* Forward declaration for prototypes. */ |
296 | struct input_event; | |
297 | ||
501d5094 | 298 | extern Lisp_Object parse_modifiers P_ ((Lisp_Object)); |
d748a3db AS |
299 | extern Lisp_Object reorder_modifiers P_ ((Lisp_Object)); |
300 | extern Lisp_Object read_char P_ ((int, int, Lisp_Object *, Lisp_Object, int *)); | |
ec558adc JB |
301 | /* User-supplied string to translate input characters through. */ |
302 | extern Lisp_Object Vkeyboard_translate_table; | |
303 | ||
ec5d8db7 | 304 | extern int parse_menu_item P_ ((Lisp_Object, int, int)); |
0340dc60 | 305 | |
d748a3db AS |
306 | extern void echo_now P_ ((void)); |
307 | extern void init_kboard P_ ((KBOARD *)); | |
308 | extern void delete_kboard P_ ((KBOARD *)); | |
309 | extern void single_kboard_state P_ ((void)); | |
c2fb5878 | 310 | extern void not_single_kboard_state P_ ((KBOARD *)); |
d748a3db AS |
311 | extern void push_frame_kboard P_ ((struct frame *)); |
312 | extern void pop_frame_kboard P_ ((void)); | |
313 | extern void record_asynch_buffer_change P_ ((void)); | |
d748a3db AS |
314 | extern SIGTYPE input_poll_signal P_ ((int)); |
315 | extern void start_polling P_ ((void)); | |
316 | extern void stop_polling P_ ((void)); | |
317 | extern void set_poll_suppress_count P_ ((int)); | |
318 | extern void gobble_input P_ ((int)); | |
319 | extern int input_polling_used P_ ((void)); | |
320 | extern void clear_input_pending P_ ((void)); | |
321 | extern int requeued_events_pending_p P_ ((void)); | |
322 | extern void bind_polling_period P_ ((int)); | |
323 | extern void stuff_buffered_input P_ ((Lisp_Object)); | |
324 | extern void clear_waiting_for_input P_ ((void)); | |
325 | extern void swallow_events P_ ((int)); | |
326 | extern int help_char_p P_ ((Lisp_Object)); | |
b41ce817 | 327 | extern void quit_throw_to_read_char P_ ((void)) NO_RETURN; |
d748a3db | 328 | extern void cmd_error_internal P_ ((Lisp_Object, char *)); |
d748a3db AS |
329 | extern int lucid_event_type_list_p P_ ((Lisp_Object)); |
330 | extern void kbd_buffer_store_event P_ ((struct input_event *)); | |
e0de7f88 KS |
331 | extern void kbd_buffer_store_event_hold P_ ((struct input_event *, |
332 | struct input_event *)); | |
87d78665 | 333 | extern void kbd_buffer_unget_event P_ ((struct input_event *)); |
d494ad02 DL |
334 | #ifdef POLL_FOR_INPUT |
335 | extern void poll_for_input_1 P_ ((void)); | |
336 | #endif | |
8d7268b4 GM |
337 | extern void show_help_echo P_ ((Lisp_Object, Lisp_Object, Lisp_Object, |
338 | Lisp_Object, int)); | |
e0de7f88 KS |
339 | extern void gen_help_event P_ ((Lisp_Object, Lisp_Object, Lisp_Object, |
340 | Lisp_Object, int)); | |
35ff954a | 341 | extern void kbd_buffer_store_help_event P_ ((Lisp_Object, Lisp_Object)); |
84b87198 | 342 | extern Lisp_Object menu_item_eval_property P_ ((Lisp_Object)); |
3f2ccb21 | 343 | extern int kbd_buffer_events_waiting P_ ((int)); |
ab5796a9 MB |
344 | |
345 | /* arch-tag: 769cbade-1ba9-4950-b886-db265b061aa3 | |
346 | (do not change this comment) */ |