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1.1 root 1: /* Copyright (c) 1981 Regents of the University of California */
2: /* sccs id: @(#)ex_vis.h 7.1 7/8/81 */
3: /*
4: * Ex version 3
5: * Mark Horton, UCB
6: * Bill Joy UCB
7: *
8: * Open and visual mode definitions.
9: *
10: * There are actually 4 major states in open/visual modes. These
11: * are visual, crt open (where the cursor can move about the screen and
12: * the screen can scroll and be erased), one line open (on dumb glass-crt's
13: * like the adm3), and hardcopy open (for everything else).
14: *
15: * The basic state is given by bastate, and the current state by state,
16: * since we can be in pseudo-hardcopy mode if we are on an adm3 and the
17: * line is longer than 80.
18: */
19:
20: var short bastate;
21: var short state;
22:
23: #define VISUAL 0
24: #define CRTOPEN 1
25: #define ONEOPEN 2
26: #define HARDOPEN 3
27:
28: /*
29: * The screen in visual and crtopen is of varying size; the basic
30: * window has top basWTOP and basWLINES lines are thereby implied.
31: * The current window (which may have grown from the basic size)
32: * has top WTOP and WLINES lines. The top line of the window is WTOP,
33: * and the bottom line WBOT. The line WECHO is used for messages,
34: * search strings and the like. If WBOT==WECHO then we are in ONEOPEN
35: * or HARDOPEN and there is no way back to the line we were on if we
36: * go to WECHO (i.e. we will have to scroll before we go there, and
37: * we can't get back). There are WCOLS columns per line.
38: * If WBOT!=WECHO then WECHO will be the last line on the screen
39: * and WBOT is the line before it.
40: */
41: var short basWTOP;
42: var short basWLINES;
43: var short WTOP;
44: var short WBOT;
45: var short WLINES;
46: var short WCOLS;
47: var short WECHO;
48:
49: /*
50: * When we are dealing with the echo area we consider the window
51: * to be "split" and set the variable splitw. Otherwise, moving
52: * off the bottom of the screen into WECHO causes a screen rollup.
53: */
54: var bool splitw;
55:
56: /*
57: * Information about each line currently on the screen includes
58: * the y coordinate associated with the line, the printing depth
59: * of the line (0 indicates unknown), and a mask which indicates
60: * whether the line is "unclean", i.e. whether we should check
61: * to make sure the line is displayed correctly at the next
62: * appropriate juncture.
63: */
64: struct vlinfo {
65: short vliny; /* Y coordinate */ /* mjm: was char */
66: short vdepth; /* Depth of displayed line */ /*mjm: was char */
67: short vflags; /* Is line potentially dirty ? */
68: };
69: var struct vlinfo vlinfo[TUBELINES + 2];
70:
71: #define DEPTH(c) (vlinfo[c].vdepth)
72: #define LINE(c) (vlinfo[c].vliny)
73: #define FLAGS(c) (vlinfo[c].vflags)
74:
75: #define VDIRT 1
76:
77: /*
78: * Hacks to copy vlinfo structures around
79: */
80: #ifdef V6
81: /* Kludge to make up for no structure assignment */
82: struct {
83: long longi;
84: };
85: # define vlcopy(i, j) i.longi = j.longi
86: #else
87: # define vlcopy(i, j) i = j;
88: #endif
89:
90: /*
91: * The current line on the screen is represented by vcline.
92: * There are vcnt lines on the screen, the last being "vcnt - 1".
93: * Vcline is intimately tied to the current value of dot,
94: * and when command mode is used as a subroutine fancy footwork occurs.
95: */
96: var short vcline;
97: var short vcnt;
98:
99: /*
100: * To allow many optimizations on output, an exact image of the terminal
101: * screen is maintained in the space addressed by vtube0. The vtube
102: * array indexes this space as lines, and is shuffled on scrolls, insert+delete
103: * lines and the like rather than (more expensively) shuffling the screen
104: * data itself. It is also rearranged during insert mode across line
105: * boundaries to make incore work easier.
106: */
107: var char *vtube[TUBELINES];
108: var char *vtube0;
109:
110: /*
111: * The current cursor position within the current line is kept in
112: * cursor. The current line is kept in linebuf. During insertions
113: * we use the auxiliary array genbuf as scratch area.
114: * The cursor wcursor and wdot are used in operations within/spanning
115: * lines to mark the other end of the affected area, or the target
116: * for a motion.
117: */
118: var char *cursor;
119: var char *wcursor;
120: var line *wdot;
121:
122: /*
123: * Undo information is saved in a LBSIZE buffer at "vutmp" for changes
124: * within the current line, or as for command mode for multi-line changes
125: * or changes on lines no longer the current line.
126: * The change kind "VCAPU" is used immediately after a U undo to prevent
127: * two successive U undo's from destroying the previous state.
128: */
129: #define VNONE 0
130: #define VCHNG 1
131: #define VMANY 2
132: #define VCAPU 3
133: #define VMCHNG 4
134: #define VMANYINS 5
135:
136: var short vundkind; /* Which kind of undo - from above */
137: var char *vutmp; /* Prev line image when "VCHNG" */
138:
139: /*
140: * State information for undoing of macros. The basic idea is that
141: * if the macro does only 1 change or even none, we don't treat it
142: * specially. If it does 2 or more changes we want to be able to
143: * undo it as a unit. We remember how many changes have been made
144: * within the current macro. (Remember macros can be nested.)
145: */
146: #define VC_NOTINMAC 0 /* Not in a macro */
147: #define VC_NOCHANGE 1 /* In a macro, no changes so far */
148: #define VC_ONECHANGE 2 /* In a macro, one change so far */
149: #define VC_MANYCHANGE 3 /* In a macro, at least 2 changes so far */
150:
151: var short vch_mac; /* Change state - one of the above */
152:
153: /*
154: * For U undo's the line is grabbed by "vmove" after it first appears
155: * on that line. The "vUNDdot" which specifies which line has been
156: * saved is selectively cleared when changes involving other lines
157: * are made, i.e. after a 'J' join. This is because a 'JU' would
158: * lose completely the text of the line just joined on.
159: */
160: var char *vUNDcurs; /* Cursor just before 'U' */
161: var line *vUNDdot; /* The line address of line saved in vUNDsav */
162: var line vUNDsav; /* Grabbed initial "*dot" */
163:
164: #define killU() vUNDdot = NOLINE
165:
166: /*
167: * There are a number of cases where special behaviour is needed
168: * from deeply nested routines. This is accomplished by setting
169: * the bits of hold, which acts to change the state of the general
170: * visual editing behaviour in specific ways.
171: *
172: * HOLDAT prevents the clreol (clear to end of line) routines from
173: * putting out @'s or ~'s on empty lines.
174: *
175: * HOLDDOL prevents the reopen routine from putting a '$' at the
176: * end of a reopened line in list mode (for hardcopy mode, e.g.).
177: *
178: * HOLDROL prevents spurious blank lines when scrolling in hardcopy
179: * open mode.
180: *
181: * HOLDQIK prevents the fake insert mode during repeated commands.
182: *
183: * HOLDPUPD prevents updating of the physical screen image when
184: * mucking around while in insert mode.
185: *
186: * HOLDECH prevents clearing of the echo area while rolling the screen
187: * backwards (e.g.) in deference to the clearing of the area at the
188: * end of the scroll (1 time instead of n times). The fact that this
189: * is actually needed is recorded in heldech, which says that a clear
190: * of the echo area was actually held off.
191: */
192: var short hold;
193: var short holdupd; /* Hold off update when echo line is too long */
194:
195: #define HOLDAT 1
196: #define HOLDDOL 2
197: #define HOLDROL 4
198: #define HOLDQIK 8
199: #define HOLDPUPD 16
200: #define HOLDECH 32
201: #define HOLDWIG 64
202:
203: /*
204: * Miscellaneous variables
205: */
206: var short CDCNT; /* Count of ^D's in insert on this line */
207: var char DEL[VBSIZE]; /* Last deleted text */
208: var bool HADUP; /* This insert line started with ^ then ^D */
209: var bool HADZERO; /* This insert line started with 0 then ^D */
210: var char INS[VBSIZE]; /* Last inserted text */
211: var int Vlines; /* Number of file lines "before" vi command */
212: var int Xcnt; /* External variable holding last cmd's count */
213: var bool Xhadcnt; /* Last command had explicit count? */
214: var short ZERO;
215: var short dir; /* Direction for search (+1 or -1) */
216: var short doomed; /* Disply chars right of cursor to be killed */
217: var bool gobblebl; /* Wrapmargin space generated nl, eat a space */
218: var bool hadcnt; /* (Almost) internal to vmain() */
219: var bool heldech; /* We owe a clear of echo area */
220: var bool insmode; /* Are in character insert mode */
221: var char lastcmd[5]; /* Chars in last command */
222: var int lastcnt; /* Count for last command */
223: var char *lastcp; /* Save current command here to repeat */
224: var bool lasthad; /* Last command had a count? */
225: var short lastvgk; /* Previous input key, if not from keyboard */
226: var short lastreg; /* Register with last command */
227: var char *ncols['z'-'a'+2]; /* Cursor positions of marks */
228: var char *notenam; /* Name to be noted with change count */
229: var char *notesgn; /* Change count from last command */
230: var char op; /* Operation of current command */
231: var short Peekkey; /* Peek ahead key */
232: var bool rubble; /* Line is filthy (in hardcopy open), redraw! */
233: var int vSCROLL; /* Number lines to scroll on ^D/^U */
234: var char *vglobp; /* Untyped input (e.g. repeat insert text) */
235: var char vmacbuf[VBSIZE]; /* Text of visual macro, hence nonnestable */
236: var char *vmacp; /* Like vglobp but for visual macros */
237: var char *vmcurs; /* Cursor for restore after undo d), e.g. */
238: var short vmovcol; /* Column to try to keep on arrow keys */
239: var bool vmoving; /* Are trying to keep vmovcol */
240: var short vreg; /* Reg for this command */ /* mjm: was char */
241: var short wdkind; /* Liberal/conservative words? */
242: var char workcmd[5]; /* Temporary for lastcmd */
243:
244:
245: /*
246: * Macros
247: */
248: #define INF 30000
249: #define LASTLINE LINE(vcnt)
250: #define OVERBUF QUOTE
251: #define beep obeep
252: #define cindent() ((outline - vlinfo[vcline].vliny) * WCOLS + outcol)
253: #define vputp(cp, cnt) tputs(cp, cnt, vputch)
254: #define vputc(c) putch(c)
255:
256: /*
257: * Function types
258: */
259: int beep();
260: int qcount();
261: int vchange();
262: int vdelete();
263: int vgrabit();
264: int vinschar();
265: int vmove();
266: int vputchar();
267: int vshift();
268: int vyankit();
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