xref: /freebsd/contrib/nvi/vi/vi.h (revision b8ba871b)
1 /*-
2  * Copyright (c) 1992, 1993, 1994
3  *	The Regents of the University of California.  All rights reserved.
4  * Copyright (c) 1992, 1993, 1994, 1995, 1996
5  *	Keith Bostic.  All rights reserved.
6  *
7  * See the LICENSE file for redistribution information.
8  */
9 
10 /* Definition of a vi "word". */
11 #define	inword(ch)	((ch) == '_' || (ISGRAPH(ch) && !ISPUNCT(ch)))
12 
13 typedef struct _vikeys VIKEYS;
14 
15 /* Structure passed around to functions implementing vi commands. */
16 typedef struct _vicmd {
17 	CHAR_T	key;			/* Command key. */
18 	CHAR_T	buffer;			/* Buffer. */
19 	CHAR_T	character;		/* Character. */
20 	u_long	count;			/* Count. */
21 	u_long	count2;			/* Second count (only used by z). */
22 	EVENT	ev;			/* Associated event. */
23 
24 #define	ISCMD(p, key)	((p) == &vikeys[key])
25 	VIKEYS const *kp;		/* Command/Motion VIKEYS entry. */
26 #define	ISMOTION(vp)	(vp->rkp != NULL && F_ISSET(vp->rkp, V_MOTION))
27 	VIKEYS const *rkp;		/* Related C/M VIKEYS entry. */
28 
29 	/*
30 	 * Historic vi allowed "dl" when the cursor was on the last column,
31 	 * deleting the last character, and similarly allowed "dw" when
32 	 * the cursor was on the last column of the file.  It didn't allow
33 	 * "dh" when the cursor was on column 1, although these cases are
34 	 * not strictly analogous.  The point is that some movements would
35 	 * succeed if they were associated with a motion command, and fail
36 	 * otherwise.  This is part of the off-by-1 schizophrenia that
37 	 * plagued vi.  Other examples are that "dfb" deleted everything
38 	 * up to and including the next 'b' character, while "d/b" deleted
39 	 * everything up to the next 'b' character.  While this implementation
40 	 * regularizes the interface to the extent possible, there are many
41 	 * special cases that can't be fixed.  The special cases are handled
42 	 * by setting flags per command so that the underlying command and
43 	 * motion routines know what's really going on.
44 	 *
45 	 * The VM_* flags are set in the vikeys array and by the underlying
46 	 * functions (motion component or command) as well.  For this reason,
47 	 * the flags in the VICMD and VIKEYS structures live in the same name
48 	 * space.
49 	 */
50 #define	VM_CMDFAILED	0x00000001	/* Command failed. */
51 #define	VM_CUTREQ	0x00000002	/* Always cut into numeric buffers. */
52 #define	VM_LDOUBLE	0x00000004	/* Doubled command for line mode. */
53 #define	VM_LMODE	0x00000008	/* Motion is line oriented. */
54 #define	VM_COMMASK	0x0000000f	/* Mask for VM flags. */
55 
56 	/*
57 	 * The VM_RCM_* flags are single usage, i.e. if you set one, you have
58 	 * to clear the others.
59 	 */
60 #define	VM_RCM		0x00000010	/* Use relative cursor movment (RCM). */
61 #define	VM_RCM_SET	0x00000020	/* RCM: set to current position. */
62 #define	VM_RCM_SETFNB	0x00000040	/* RCM: set to first non-blank (FNB). */
63 #define	VM_RCM_SETLAST	0x00000080	/* RCM: set to last character. */
64 #define	VM_RCM_SETNNB	0x00000100	/* RCM: set to next non-blank. */
65 #define	VM_RCM_MASK	0x000001f0	/* Mask for RCM flags. */
66 
67 	/* Flags for the underlying function. */
68 #define	VC_BUFFER	0x00000200	/* The buffer was set. */
69 #define	VC_C1RESET	0x00000400	/* Reset C1SET flag for dot commands. */
70 #define	VC_C1SET	0x00000800	/* Count 1 was set. */
71 #define	VC_C2SET	0x00001000	/* Count 2 was set. */
72 #define	VC_ISDOT	0x00002000	/* Command was the dot command. */
73 	u_int32_t flags;
74 
75 	/*
76 	 * There are four cursor locations that we worry about: the initial
77 	 * cursor position, the start of the range, the end of the range,
78 	 * and the final cursor position.  The initial cursor position and
79 	 * the start of the range are both m_start, and are always the same.
80 	 * All locations are initialized to the starting cursor position by
81 	 * the main vi routines, and the underlying functions depend on this.
82 	 *
83 	 * Commands that can be motion components set the end of the range
84 	 * cursor position, m_stop.  All commands must set the ending cursor
85 	 * position, m_final.  The reason that m_stop isn't the same as m_final
86 	 * is that there are situations where the final position of the cursor
87 	 * is outside of the cut/delete range (e.g. 'd[[' from the first column
88 	 * of a line).  The final cursor position often varies based on the
89 	 * direction of the movement, as well as the command.  The only special
90 	 * case that the delete code handles is that it will make adjustments
91 	 * if the final cursor position is deleted.
92 	 *
93 	 * The reason for all of this is that the historic vi semantics were
94 	 * defined command-by-command.  Every function has to roll its own
95 	 * starting and stopping positions, and adjust them if it's being used
96 	 * as a motion component.  The general rules are as follows:
97 	 *
98 	 *	1: If not a motion component, the final cursor is at the end
99 	 *	   of the range.
100 	 *	2: If moving backward in the file, delete and yank move the
101 	 *	   final cursor to the end of the range.
102 	 *	3: If moving forward in the file, delete and yank leave the
103 	 *	   final cursor at the start of the range.
104 	 *
105 	 * Usually, if moving backward in the file and it's a motion component,
106 	 * the starting cursor is decremented by a single character (or, in a
107 	 * few cases, to the end of the previous line) so that the starting
108 	 * cursor character isn't cut or deleted.  No cursor adjustment is
109 	 * needed for moving forward, because the cut/delete routines handle
110 	 * m_stop inclusively, i.e. the last character in the range is cut or
111 	 * deleted.  This makes cutting to the EOF/EOL reasonable.
112 	 *
113 	 * The 'c', '<', '>', and '!' commands are special cases.  We ignore
114 	 * the final cursor position for all of them: for 'c', the text input
115 	 * routines set the cursor to the last character inserted; for '<',
116 	 * '>' and '!', the underlying ex commands that do the operation will
117 	 * set the cursor for us, usually to something related to the first
118 	 * <nonblank>.
119 	 */
120 	MARK	 m_start;		/* mark: initial cursor, range start. */
121 	MARK	 m_stop;		/* mark: range end. */
122 	MARK	 m_final;		/* mark: final cursor position. */
123 } VICMD;
124 
125 /* Vi command table structure. */
126 struct _vikeys {			/* Underlying function. */
127 	int	 (*func)(SCR *, VICMD *);
128 #define	V_ABS		0x00004000	/* Absolute movement, set '' mark. */
129 #define	V_ABS_C		0x00008000	/* V_ABS: if the line/column changed. */
130 #define	V_ABS_L		0x00010000	/* V_ABS: if the line changed. */
131 #define	V_CHAR		0x00020000	/* Character (required, trailing). */
132 #define	V_CNT		0x00040000	/* Count (optional, leading). */
133 #define	V_DOT		0x00080000	/* On success, sets dot command. */
134 #define	V_KEYW		0x00100000	/* Cursor referenced word. */
135 #define	V_MOTION	0x00200000	/* Motion (required, trailing). */
136 #define	V_MOVE		0x00400000	/* Command defines movement. */
137 #define	V_OBUF		0x00800000	/* Buffer (optional, leading). */
138 #define	V_RBUF		0x01000000	/* Buffer (required, trailing). */
139 #define	V_SECURE	0x02000000	/* Permission denied if O_SECURE set. */
140 	u_int32_t flags;
141 	char	*usage;			/* Usage line. */
142 	char	*help;			/* Help line. */
143 };
144 #define	MAXVIKEY	126		/* List of vi commands. */
145 extern VIKEYS const vikeys[MAXVIKEY + 1];
146 extern VIKEYS const tmotion;		/* XXX Hacked ~ command. */
147 
148 /* Character stream structure, prototypes. */
149 typedef struct _vcs {
150 	recno_t	 cs_lno;		/* Line. */
151 	size_t	 cs_cno;		/* Column. */
152 	CHAR_T	*cs_bp;			/* Buffer. */
153 	size_t	 cs_len;		/* Length. */
154 	CHAR_T	 cs_ch;			/* Character. */
155 #define	CS_EMP	1			/* Empty line. */
156 #define	CS_EOF	2			/* End-of-file. */
157 #define	CS_EOL	3			/* End-of-line. */
158 #define	CS_SOF	4			/* Start-of-file. */
159 	int	 cs_flags;		/* Return flags. */
160 } VCS;
161 
162 int	cs_bblank(SCR *, VCS *);
163 int	cs_fblank(SCR *, VCS *);
164 int	cs_fspace(SCR *, VCS *);
165 int	cs_init(SCR *, VCS *);
166 int	cs_next(SCR *, VCS *);
167 int	cs_prev(SCR *, VCS *);
168 
169 /*
170  * We use a single "window" for each set of vi screens.  The model would be
171  * simpler with two windows (one for the text, and one for the modeline)
172  * because scrolling the text window down would work correctly then, not
173  * affecting the mode line.  As it is we have to play games to make it look
174  * right.  The reason for this choice is that it would be difficult for
175  * curses to optimize the movement, i.e. detect that the downward scroll
176  * isn't going to change the modeline, set the scrolling region on the
177  * terminal and only scroll the first part of the text window.
178  *
179  * Structure for mapping lines to the screen.  An SMAP is an array, with one
180  * structure element per screen line, which holds information describing the
181  * physical line which is displayed in the screen line.  The first two fields
182  * (lno and off) are all that are necessary to describe a line.  The rest of
183  * the information is useful to keep information from being re-calculated.
184  *
185  * The SMAP always has an entry for each line of the physical screen, plus a
186  * slot for the colon command line, so there is room to add any screen into
187  * another one at screen exit.
188  *
189  * Lno is the line number.  If doing the historic vi long line folding, soff
190  * is the screen offset into the line.  For example, the pair 2:1 would be
191  * the first screen of line 2, and 2:2 would be the second.  In the case of
192  * long lines, the screen map will tend to be staggered, e.g., 1:1, 1:2, 1:3,
193  * 2:1, 3:1, etc.  If doing left-right scrolling, the coff field is the screen
194  * column offset into the lines, and can take on any value, as it's adjusted
195  * by the user set value O_SIDESCROLL.
196  */
197 typedef struct _smap {
198 	recno_t  lno;	/* 1-N: Physical file line number. */
199 	size_t	 coff;		/* 0-N: Column offset in the line. */
200 	size_t	 soff;		/* 1-N: Screen offset in the line. */
201 
202 				/* vs_line() cache information. */
203 	size_t	 c_sboff;	/* 0-N: offset of first character on screen. */
204 	size_t	 c_eboff;	/* 0-N: offset of  last character on screen. */
205 	u_int8_t c_scoff;	/* 0-N: offset into the first character. */
206 				/* 255: no character of line visible. */
207 	u_int8_t c_eclen;	/* 1-N: columns from the last character. */
208 	u_int8_t c_ecsize;	/* 1-N: size of the last character. */
209 } SMAP;
210 				/* Macros to flush/test cached information. */
211 #define	SMAP_CACHE(smp)		((smp)->c_ecsize != 0)
212 #define	SMAP_FLUSH(smp)		((smp)->c_ecsize = 0)
213 
214 				/* Character search information. */
215 typedef enum { CNOTSET, FSEARCH, fSEARCH, TSEARCH, tSEARCH } cdir_t;
216 
217 typedef enum { AB_NOTSET, AB_NOTWORD, AB_INWORD } abb_t;
218 typedef enum { Q_NOTSET, Q_VNEXT, Q_VTHIS } quote_t;
219 
220 /* Vi private, per-screen memory. */
221 typedef struct _vi_private {
222 	VICMD	cmd;		/* Current command, motion. */
223 	VICMD	motion;
224 
225 	/*
226 	 * !!!
227 	 * The saved command structure can be modified by the underlying
228 	 * vi functions, see v_Put() and v_put().
229 	 */
230 	VICMD	sdot;		/* Saved dot, motion command. */
231 	VICMD	sdotmotion;
232 
233 	CHAR_T *keyw;		/* Keyword buffer. */
234 	size_t	klen;		/* Keyword length. */
235 	size_t	keywlen;	/* Keyword buffer length. */
236 
237 	CHAR_T	rlast;		/* Last 'r' replacement character. */
238 	e_key_t	rvalue;		/* Value of last replacement character. */
239 
240 	EVENT  *rep;		/* Input replay buffer. */
241 	size_t	rep_len;	/* Input replay buffer length. */
242 	size_t	rep_cnt;	/* Input replay buffer characters. */
243 
244 	mtype_t	mtype;		/* Last displayed message type. */
245 	size_t	linecount;	/* 1-N: Output overwrite count. */
246 	size_t	lcontinue;	/* 1-N: Output line continue value. */
247 	size_t	totalcount;	/* 1-N: Output overwrite count. */
248 
249 				/* Busy state. */
250 	int	busy_ref;	/* Busy reference count. */
251 	int	busy_ch;	/* Busy character. */
252 	size_t	busy_fx;	/* Busy character x coordinate. */
253 	size_t	busy_oldy;	/* Saved y coordinate. */
254 	size_t	busy_oldx;	/* Saved x coordinate. */
255 	struct timespec busy_ts;/* Busy timer. */
256 
257 	MARK	sel;		/* Select start position. */
258 
259 	CHAR_T *mcs;		/* Match character list. */
260 	char   *ps;		/* Paragraph plus section list. */
261 
262 	u_long	u_ccnt;		/* Undo command count. */
263 
264 	CHAR_T	lastckey;	/* Last search character. */
265 	cdir_t	csearchdir;	/* Character search direction. */
266 
267 	SMAP   *h_smap;		/* First slot of the line map. */
268 	SMAP   *t_smap;		/* Last slot of the line map. */
269 
270 	/*
271 	 * One extra slot is always allocated for the map so that we can use
272 	 * it to do vi :colon command input; see v_tcmd().
273 	 */
274 	recno_t	sv_tm_lno;	/* tcmd: saved TMAP lno field. */
275 	size_t	sv_tm_coff;	/* tcmd: saved TMAP coff field. */
276 	size_t	sv_tm_soff;	/* tcmd: saved TMAP soff field. */
277 	size_t	sv_t_maxrows;	/* tcmd: saved t_maxrows. */
278 	size_t	sv_t_minrows;	/* tcmd: saved t_minrows. */
279 	size_t	sv_t_rows;	/* tcmd: saved t_rows. */
280 #define	SIZE_HMAP(sp)	(VIP(sp)->srows + 1)
281 
282 	/*
283 	 * Macros to get to the head/tail of the smap.  If the screen only has
284 	 * one line, HMAP can be equal to TMAP, so the code has to understand
285 	 * the off-by-one errors that can result.  If stepping through an SMAP
286 	 * and operating on each entry, use sp->t_rows as the count of slots,
287 	 * don't use a loop that compares <= TMAP.
288 	 */
289 #define	_HMAP(sp)	(VIP(sp)->h_smap)
290 #define	HMAP		_HMAP(sp)
291 #define	_TMAP(sp)	(VIP(sp)->t_smap)
292 #define	TMAP		_TMAP(sp)
293 
294 	recno_t	ss_lno;	/* 1-N: vi_opt_screens cached line number. */
295 	size_t	ss_screens;	/* vi_opt_screens cached return value. */
296 #define	VI_SCR_CFLUSH(vip)	vip->ss_lno = OOBLNO
297 
298 	size_t	srows;		/* 1-N: rows in the terminal/window. */
299 	recno_t	olno;		/* 1-N: old cursor file line. */
300 	size_t	ocno;		/* 0-N: old file cursor column. */
301 	size_t	sc_col;		/* 0-N: LOGICAL screen column. */
302 	SMAP   *sc_smap;	/* SMAP entry where sc_col occurs. */
303 
304 #define	VIP_CUR_INVALID	0x0001	/* Cursor position is unknown. */
305 #define	VIP_DIVIDER	0x0002	/* Divider line was displayed. */
306 #define	VIP_N_EX_PAINT	0x0004	/* Clear and repaint when ex finishes. */
307 #define	VIP_N_EX_REDRAW	0x0008	/* Schedule SC_SCR_REDRAW when ex finishes. */
308 #define	VIP_N_REFRESH	0x0010	/* Repaint (from SMAP) on the next refresh. */
309 #define	VIP_N_RENUMBER	0x0020	/* Renumber screen on the next refresh. */
310 #define	VIP_RCM_LAST	0x0040	/* Cursor drawn to the last column. */
311 #define	VIP_S_MODELINE	0x0080	/* Skip next modeline refresh. */
312 #define	VIP_S_REFRESH	0x0100	/* Skip next refresh. */
313 	u_int16_t flags;
314 } VI_PRIVATE;
315 
316 /* Vi private area. */
317 #define	VIP(sp)	((VI_PRIVATE *)((sp)->vi_private))
318 
319 #define	O_NUMBER_FMT	"%7lu "			/* O_NUMBER format, length. */
320 #define	O_NUMBER_LENGTH	8
321 #define	SCREEN_COLS(sp)				/* Screen columns. */	\
322 	((O_ISSET(sp, O_NUMBER) ? (sp)->cols - O_NUMBER_LENGTH : (sp)->cols))
323 
324 /*
325  * LASTLINE is the zero-based, last line in the screen.  Note that it is correct
326  * regardless of the changes in the screen to permit text input on the last line
327  * of the screen, or the existence of small screens.
328  */
329 #define LASTLINE(sp) \
330 	((sp)->t_maxrows < (sp)->rows ? (sp)->t_maxrows : (sp)->rows - 1)
331 
332 /*
333  * Small screen (see vs_refresh.c, section 6a) and one-line screen test.
334  * Note, both cannot be true for the same screen.
335  */
336 #define	IS_SMALL(sp)	((sp)->t_minrows != (sp)->t_maxrows)
337 #define	IS_ONELINE(sp)	((sp)->rows == 1)
338 
339 #define	HALFTEXT(sp)				/* Half text. */	\
340 	((sp)->t_rows == 1 ? 1 : (sp)->t_rows / 2)
341 #define	HALFSCREEN(sp)				/* Half text screen. */	\
342 	((sp)->t_maxrows == 1 ? 1 : (sp)->t_maxrows / 2)
343 
344 /*
345  * Next tab offset.
346  *
347  * !!!
348  * There are problems with how the historical vi handled tabs.  For example,
349  * by doing "set ts=3" and building lines that fold, you can get it to step
350  * through tabs as if they were spaces and move inserted characters to new
351  * positions when <esc> is entered.  I believe that nvi does tabs correctly,
352  * but there are some historical incompatibilities.
353  */
354 #define	TAB_OFF(c)	COL_OFF((c), O_VAL(sp, O_TABSTOP))
355 
356 /* If more than one horizontal screen being shown. */
357 #define	IS_HSPLIT(sp)							\
358 	((sp)->rows != O_VAL(sp, O_LINES))
359 /* If more than one vertical screen being shown. */
360 #define	IS_VSPLIT(sp)							\
361 	((sp)->cols != O_VAL(sp, O_COLUMNS))
362 /* If more than one screen being shown. */
363 #define	IS_SPLIT(sp)							\
364 	(IS_HSPLIT(sp) || IS_VSPLIT(sp))
365 
366 /* Screen adjustment operations. */
367 typedef enum { A_DECREASE, A_INCREASE, A_SET } adj_t;
368 
369 /* Screen position operations. */
370 typedef enum { P_BOTTOM, P_FILL, P_MIDDLE, P_TOP } pos_t;
371 
372 /* Scrolling operations. */
373 typedef enum {
374 	CNTRL_B, CNTRL_D, CNTRL_E, CNTRL_F,
375 	CNTRL_U, CNTRL_Y, Z_CARAT, Z_PLUS
376 } scroll_t;
377 
378 /* Vi common error messages. */
379 typedef enum {
380 	VIM_COMBUF, VIM_EMPTY, VIM_EOF, VIM_EOL,
381 	VIM_NOCOM, VIM_NOCOM_B, VIM_USAGE, VIM_WRESIZE
382 } vim_t;
383 
384 #include "extern.h"
385