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 cnt = F_ISSET(vp, VC_C1SET) ? vp->count : 1;
93 for (lno = vp->m_start.lno; !db_get(sp, ++lno, 0, &p, &len);) {
94 if (len == 0)
95 continue;
96 if (p[0] == '{' || (ISMOTION(vp) && p[0] == '}')) {
97 if (!--cnt) {
98 if (p[0] == '{')
99 goto adjust1;
100 goto adjust2;
101 }
102 continue;
103 }
104 /*
105 * !!!
106 * Historic documentation (USD:15-11, 4.2) said that formfeed
107 * characters (^L) in the first column delimited sections.
108 * The historic code mentions formfeed characters, but never
109 * implements them. Seems reasonable, do it.
110 */
111 if (p[0] == '\014') {
112 if (!--cnt)
113 goto adjust1;
114 continue;
115 }
116 if (p[0] != '.' || len < 2)
117 continue;
118 for (lp = list; *lp != '\0'; lp += 2 * sizeof(*lp))
119 if (lp[0] == p[1] &&
120 ((lp[1] == ' ' && len == 2) || lp[1] == p[2]) &&
121 !--cnt) {
122 /*
123 * !!!
124 * If not cutting this line, adjust to the end
125 * of the previous one. Otherwise, position to
126 * column 0.
127 */
128 adjust1: if (ISMOTION(vp))
129 goto ret1;
130
131 adjust2: vp->m_stop.lno = lno;
132 vp->m_stop.cno = 0;
133 goto ret2;
134 }
135 }
136
137 /* If moving forward, reached EOF, check to see if we started there. */
138 if (vp->m_start.lno == lno - 1) {
139 v_eof(sp, NULL);
140 return (1);
141 }
142
143 ret1: if (db_get(sp, --lno, DBG_FATAL, NULL, &len))
144 return (1);
145 vp->m_stop.lno = lno;
146 vp->m_stop.cno = len ? len - 1 : 0;
147
148 /*
149 * Non-motion commands go to the end of the range. Delete and
150 * yank stay at the start of the range. Ignore others.
151 */
152 ret2: if (ISMOTION(vp)) {
153 vp->m_final = vp->m_start;
154 if (F_ISSET(vp, VM_LMODE))
155 vp->m_final.cno = 0;
156 } else
157 vp->m_final = vp->m_stop;
158 return (0);
159 }
160
161 /*
162 * v_sectionb -- [count][[
163 * Move backward count sections/functions.
164 *
165 * PUBLIC: int v_sectionb(SCR *, VICMD *);
166 */
167 int
v_sectionb(SCR * sp,VICMD * vp)168 v_sectionb(SCR *sp, VICMD *vp)
169 {
170 size_t len;
171 recno_t cnt, lno;
172 CHAR_T *p;
173 char *list, *lp;
174
175 /* An empty file or starting from line 1 is always illegal. */
176 if (vp->m_start.lno <= 1) {
177 v_sof(sp, NULL);
178 return (1);
179 }
180
181 /* Get the macro list. */
182 if ((list = O_STR(sp, O_SECTIONS)) == NULL)
183 return (1);
184
185 cnt = F_ISSET(vp, VC_C1SET) ? vp->count : 1;
186 for (lno = vp->m_start.lno; !db_get(sp, --lno, 0, &p, &len);) {
187 if (len == 0)
188 continue;
189 if (p[0] == '{') {
190 if (!--cnt)
191 goto adjust1;
192 continue;
193 }
194 /*
195 * !!!
196 * Historic documentation (USD:15-11, 4.2) said that formfeed
197 * characters (^L) in the first column delimited sections.
198 * The historic code mentions formfeed characters, but never
199 * implements them. Seems reasonable, do it.
200 */
201 if (p[0] == '\014') {
202 if (!--cnt)
203 goto adjust1;
204 continue;
205 }
206 if (p[0] != '.' || len < 2)
207 continue;
208 for (lp = list; *lp != '\0'; lp += 2 * sizeof(*lp))
209 if (lp[0] == p[1] &&
210 ((lp[1] == ' ' && len == 2) || lp[1] == p[2]) &&
211 !--cnt) {
212 adjust1: vp->m_stop.lno = lno;
213 vp->m_stop.cno = 0;
214 goto ret1;
215 }
216 }
217
218 /*
219 * If moving backward, reached SOF, which is a movement sink.
220 * We already checked for starting there.
221 */
222 vp->m_stop.lno = 1;
223 vp->m_stop.cno = 0;
224
225 /*
226 * All commands move to the end of the range.
227 *
228 * !!!
229 * Historic practice is the section cut was in line mode if it started
230 * from column 0 and was in the backward direction. Otherwise, left
231 * motion commands adjust the starting point to the character before
232 * the current one. What makes this worse is that if it cut to line
233 * mode it also went to the first non-<blank>.
234 */
235 ret1: if (vp->m_start.cno == 0) {
236 F_CLR(vp, VM_RCM_MASK);
237 F_SET(vp, VM_RCM_SETFNB);
238
239 --vp->m_start.lno;
240 F_SET(vp, VM_LMODE);
241 } else
242 --vp->m_start.cno;
243
244 vp->m_final = vp->m_stop;
245 return (0);
246 }
247