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.
7 * See the LICENSE file for redistribution information.
13 static const char sccsid[] = "@(#)v_paragraph.c 10.7 (Berkeley) 3/6/96";
16 #include <sys/types.h>
17 #include <sys/queue.h>
20 #include <bitstring.h>
27 #include "../common/common.h"
30 #define INTEXT_CHECK { \
31 if (len == 0 || v_isempty(p, len)) { \
38 * Historic documentation (USD:15-11, 4.2) said that formfeed \
39 * characters (^L) in the first column delimited paragraphs. \
40 * The historic vi code mentions formfeed characters, but never \
41 * implements them. It seems reasonable, do it. \
43 if (p[0] == '\014') { \
48 if (p[0] != '.' || len < 2) \
50 for (lp = VIP(sp)->ps; *lp != '\0'; lp += 2) \
51 if (lp[0] == p[1] && \
52 (lp[1] == ' ' && len == 2 || lp[1] == p[2]) && \
58 * v_paragraphf -- [count]}
59 * Move forward count paragraphs.
61 * Paragraphs are empty lines after text, formfeed characters, or values
62 * from the paragraph or section options.
64 * PUBLIC: int v_paragraphf __P((SCR *, VICMD *));
71 enum { P_INTEXT, P_INBLANK } pstate;
73 recno_t cnt, lastlno, lno;
79 * If the starting cursor position is at or before any non-blank
80 * characters in the line, i.e. the movement is cutting all of the
81 * line's text, the buffer is in line mode. It's a lot easier to
82 * check here, because we know that the end is going to be the start
85 * This was historical practice in vi, with a single exception. If
86 * the paragraph movement was from the start of the last line to EOF,
87 * then all the characters were deleted from the last line, but the
88 * line itself remained. If somebody complains, don't pause, don't
89 * hesitate, just hit them.
92 if (vp->m_start.cno == 0)
95 vp->m_stop = vp->m_start;
97 if (nonblank(sp, vp->m_stop.lno, &vp->m_stop.cno))
99 if (vp->m_start.cno <= vp->m_stop.cno)
103 /* Figure out what state we're currently in. */
104 lno = vp->m_start.lno;
105 if (db_get(sp, lno, 0, &p, &len))
109 * If we start in text, we want to switch states
110 * (2 * N - 1) times, in non-text, (2 * N) times.
112 cnt = F_ISSET(vp, VC_C1SET) ? vp->count : 1;
114 if (len == 0 || v_isempty(p, len))
124 if (db_get(sp, ++lno, 0, &p, &len))
131 if (len == 0 || v_isempty(p, len))
139 * Non-motion commands move to the end of the range,
140 * delete and yank stay at the start. Ignore others.
141 * Adjust the end of the range for motion commands;
142 * historically, a motion component was to the end of
143 * the previous line, whereas the movement command was
144 * to the start of the new "paragraph".
146 found: if (ISMOTION(vp)) {
147 vp->m_stop.lno = lastlno;
148 vp->m_stop.cno = lastlen ? lastlen - 1 : 0;
149 vp->m_final = vp->m_start;
151 vp->m_stop.lno = lno;
153 vp->m_final = vp->m_stop;
163 * Adjust end of the range for motion commands; EOF is a movement
164 * sink. The } command historically moved to the end of the last
165 * line, not the beginning, from any position before the end of the
166 * last line. It also historically worked on empty files, so we
167 * have to make it okay.
169 eof: if (vp->m_start.lno == lno || vp->m_start.lno == lno - 1) {
170 if (db_eget(sp, vp->m_start.lno, &p, &len, &isempty)) {
176 if (vp->m_start.cno == (len ? len - 1 : 0)) {
183 * Non-motion commands move to the end of the range, delete
184 * and yank stay at the start. Ignore others.
186 * If deleting the line (which happens if deleting to EOF), then
187 * cursor movement is to the first nonblank.
189 if (ISMOTION(vp) && ISCMD(vp->rkp, 'd')) {
190 F_CLR(vp, VM_RCM_MASK);
191 F_SET(vp, VM_RCM_SETFNB);
193 vp->m_stop.lno = lno - 1;
194 vp->m_stop.cno = len ? len - 1 : 0;
195 vp->m_final = ISMOTION(vp) ? vp->m_start : vp->m_stop;
200 * v_paragraphb -- [count]{
201 * Move backward count paragraphs.
203 * PUBLIC: int v_paragraphb __P((SCR *, VICMD *));
210 enum { P_INTEXT, P_INBLANK } pstate;
217 * Check for SOF. The historic vi didn't complain if users hit SOF
218 * repeatedly, unless it was part of a motion command. There is no
219 * question but that Emerson's editor of choice was vi.
221 * The { command historically moved to the beginning of the first
222 * line if invoked on the first line.
225 * If the starting cursor position is in the first column (backward
226 * paragraph movements did NOT historically pay attention to non-blank
227 * characters) i.e. the movement is cutting the entire line, the buffer
228 * is in line mode. Cuts from the beginning of the line also did not
229 * cut the current line, but started at the previous EOL.
231 * Correct for a left motion component while we're thinking about it.
233 lno = vp->m_start.lno;
236 if (vp->m_start.cno == 0) {
237 if (vp->m_start.lno == 1) {
238 v_sof(sp, &vp->m_start);
246 if (vp->m_start.lno <= 1)
249 /* Figure out what state we're currently in. */
250 if (db_get(sp, lno, 0, &p, &len))
254 * If we start in text, we want to switch states
255 * (2 * N - 1) times, in non-text, (2 * N) times.
257 cnt = F_ISSET(vp, VC_C1SET) ? vp->count : 1;
259 if (len == 0 || v_isempty(p, len))
267 * If the starting cursor is past the first column,
268 * the current line is checked for a paragraph.
270 if (vp->m_start.cno > 0)
275 if (db_get(sp, --lno, 0, &p, &len))
282 if (len != 0 && !v_isempty(p, len)) {
293 /* SOF is a movement sink. */
296 found: vp->m_stop.lno = lno;
300 * All commands move to the end of the range. (We already
301 * adjusted the start of the range for motion commands).
303 vp->m_final = vp->m_stop;
309 * Build the paragraph command search pattern.
311 * PUBLIC: int v_buildps __P((SCR *, char *, char *));
314 v_buildps(sp, p_p, s_p)
323 * The vi paragraph command searches for either a paragraph or
324 * section option macro.
326 p_len = p_p == NULL ? 0 : strlen(p_p);
327 s_len = s_p == NULL ? 0 : strlen(s_p);
329 if (p_len == 0 && s_len == 0)
332 MALLOC_RET(sp, p, char *, p_len + s_len + 1);
339 memmove(p, p_p, p_len + 1);
341 memmove(p + p_len, s_p, s_len + 1);