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 #include "config.h"
11
12 #include <sys/types.h>
13 #include <sys/queue.h>
14 #include <sys/time.h>
15
16 #include <bitstring.h>
17 #include <limits.h>
18 #include <stdio.h>
19 #include <string.h>
20
21 #include "../common/common.h"
22 #include "vi.h"
23
24 /*
25 * !!!
26 * In historic vi, the section commands ignored empty lines, unlike the
27 * paragraph commands, which was probably okay. However, they also moved
28 * to the start of the last line when there where no more sections instead
29 * of the end of the last line like the paragraph commands. I've changed
30 * the latter behavior to match the paragraph commands.
31 *
32 * In historic vi, a section was defined as the first character(s) of the
33 * line matching, which could be followed by anything. This implementation
34 * follows that historic practice.
35 *
36 * !!!
37 * The historic vi documentation (USD:15-10) claimed:
38 * The section commands interpret a preceding count as a different
39 * window size in which to redraw the screen at the new location,
40 * and this window size is the base size for newly drawn windows
41 * until another size is specified. This is very useful if you are
42 * on a slow terminal ...
43 *
44 * I can't get the 4BSD vi to do this, it just beeps at me. For now, a
45 * count to the section commands simply repeats the command.
46 */
47
48 /*
49 * v_sectionf -- [count]]]
50 * Move forward count sections/functions.
51 *
52 * !!!
53 * Using ]] as a motion command was a bit special, historically. It could
54 * match } as well as the usual { and section values. If it matched a { or
55 * a section, it did NOT include the matched line. If it matched a }, it
56 * did include the line. No clue why.
57 *
58 * PUBLIC: int v_sectionf(SCR *, VICMD *);
59 */
60 int
v_sectionf(SCR * sp,VICMD * vp)61 v_sectionf(SCR *sp, VICMD *vp)
62 {
63 recno_t cnt, lno;
64 size_t len;
65 CHAR_T *p;
66 char *list, *lp;
67
68 /* Get the macro list. */
69 if ((list = O_STR(sp, O_SECTIONS)) == NULL)
70 return (1);
71
72 /*
73 * !!!
74 * If the starting cursor position is at or before any non-blank
75 * characters in the line, i.e. the movement is cutting all of the
76 * line's text, the buffer is in line mode. It's a lot easier to
77 * check here, because we know that the end is going to be the start
78 * or end of a line.
79 */
80 if (ISMOTION(vp)) {
81 if (vp->m_start.cno == 0)
82 F_SET(vp, VM_LMODE);
83 else {
84 vp->m_stop = vp->m_start;
85 vp->m_stop.cno = 0;
86 if (nonblank(sp, vp->m_stop.lno, &vp->m_stop.cno))
87 return (1);
88 if (vp->m_start.cno <= vp->m_stop.cno)
89 F_SET(vp, VM_LMODE);
90 }
91 }
92
93 cnt = F_ISSET(vp, VC_C1SET) ? vp->count : 1;
94 for (lno = vp->m_start.lno; !db_get(sp, ++lno, 0, &p, &len);) {
95 if (len == 0)
96 continue;
97 if (p[0] == '{' || (ISMOTION(vp) && p[0] == '}')) {
98 if (!--cnt) {
99 if (p[0] == '{')
100 goto adjust1;
101 goto adjust2;
102 }
103 continue;
104 }
105 /*
106 * !!!
107 * Historic documentation (USD:15-11, 4.2) said that formfeed
108 * characters (^L) in the first column delimited sections.
109 * The historic code mentions formfeed characters, but never
110 * implements them. Seems reasonable, do it.
111 */
112 if (p[0] == '\014') {
113 if (!--cnt)
114 goto adjust1;
115 continue;
116 }
117 if (p[0] != '.' || len < 2)
118 continue;
119 for (lp = list; *lp != '\0'; lp += 2 * sizeof(*lp))
120 if (lp[0] == p[1] &&
121 ((lp[1] == ' ' && len == 2) || lp[1] == p[2]) &&
122 !--cnt) {
123 /*
124 * !!!
125 * If not cutting this line, adjust to the end
126 * of the previous one. Otherwise, position to
127 * column 0.
128 */
129 adjust1: if (ISMOTION(vp))
130 goto ret1;
131
132 adjust2: vp->m_stop.lno = lno;
133 vp->m_stop.cno = 0;
134 goto ret2;
135 }
136 }
137
138 /* If moving forward, reached EOF, check to see if we started there. */
139 if (vp->m_start.lno == lno - 1) {
140 v_eof(sp, NULL);
141 return (1);
142 }
143
144 ret1: if (db_get(sp, --lno, DBG_FATAL, NULL, &len))
145 return (1);
146 vp->m_stop.lno = lno;
147 vp->m_stop.cno = len ? len - 1 : 0;
148
149 /*
150 * Non-motion commands go to the end of the range. Delete and
151 * yank stay at the start of the range. Ignore others.
152 */
153 ret2: if (ISMOTION(vp)) {
154 vp->m_final = vp->m_start;
155 if (F_ISSET(vp, VM_LMODE))
156 vp->m_final.cno = 0;
157 } else
158 vp->m_final = vp->m_stop;
159 return (0);
160 }
161
162 /*
163 * v_sectionb -- [count][[
164 * Move backward count sections/functions.
165 *
166 * PUBLIC: int v_sectionb(SCR *, VICMD *);
167 */
168 int
v_sectionb(SCR * sp,VICMD * vp)169 v_sectionb(SCR *sp, VICMD *vp)
170 {
171 size_t len;
172 recno_t cnt, lno;
173 CHAR_T *p;
174 char *list, *lp;
175
176 /* An empty file or starting from line 1 is always illegal. */
177 if (vp->m_start.lno <= 1) {
178 v_sof(sp, NULL);
179 return (1);
180 }
181
182 /* Get the macro list. */
183 if ((list = O_STR(sp, O_SECTIONS)) == NULL)
184 return (1);
185
186 cnt = F_ISSET(vp, VC_C1SET) ? vp->count : 1;
187 for (lno = vp->m_start.lno; !db_get(sp, --lno, 0, &p, &len);) {
188 if (len == 0)
189 continue;
190 if (p[0] == '{') {
191 if (!--cnt)
192 goto adjust1;
193 continue;
194 }
195 /*
196 * !!!
197 * Historic documentation (USD:15-11, 4.2) said that formfeed
198 * characters (^L) in the first column delimited sections.
199 * The historic code mentions formfeed characters, but never
200 * implements them. Seems reasonable, do it.
201 */
202 if (p[0] == '\014') {
203 if (!--cnt)
204 goto adjust1;
205 continue;
206 }
207 if (p[0] != '.' || len < 2)
208 continue;
209 for (lp = list; *lp != '\0'; lp += 2 * sizeof(*lp))
210 if (lp[0] == p[1] &&
211 ((lp[1] == ' ' && len == 2) || lp[1] == p[2]) &&
212 !--cnt) {
213 adjust1: vp->m_stop.lno = lno;
214 vp->m_stop.cno = 0;
215 goto ret1;
216 }
217 }
218
219 /*
220 * If moving backward, reached SOF, which is a movement sink.
221 * We already checked for starting there.
222 */
223 vp->m_stop.lno = 1;
224 vp->m_stop.cno = 0;
225
226 /*
227 * All commands move to the end of the range.
228 *
229 * !!!
230 * Historic practice is the section cut was in line mode if it started
231 * from column 0 and was in the backward direction. Otherwise, left
232 * motion commands adjust the starting point to the character before
233 * the current one. What makes this worse is that if it cut to line
234 * mode it also went to the first non-<blank>.
235 */
236 ret1: if (vp->m_start.cno == 0) {
237 F_CLR(vp, VM_RCM_MASK);
238 F_SET(vp, VM_RCM_SETFNB);
239
240 --vp->m_start.lno;
241 F_SET(vp, VM_LMODE);
242 } else
243 --vp->m_start.cno;
244
245 vp->m_final = vp->m_stop;
246 return (0);
247 }
248