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[] = "$Id: v_sentence.c,v 10.9 2001/06/25 15:19:35 skimo Exp $";
16 #include <sys/types.h>
17 #include <sys/queue.h>
20 #include <bitstring.h>
25 #include "../common/common.h"
30 * In historic vi, a sentence was delimited by a '.', '?' or '!' character
31 * followed by TWO spaces or a newline. One or more empty lines was also
32 * treated as a separate sentence. The Berkeley documentation for historical
33 * vi states that any number of ')', ']', '"' and '\'' characters can be
34 * between the delimiter character and the spaces or end of line, however,
35 * the historical implementation did not handle additional '"' characters.
36 * We follow the documentation here, not the implementation.
38 * Once again, historical vi didn't do sentence movements associated with
39 * counts consistently, mostly in the presence of lines containing only
40 * white-space characters.
42 * This implementation also permits a single tab to delimit sentences, and
43 * treats lines containing only white-space characters as empty lines.
44 * Finally, tabs are eaten (along with spaces) when skipping to the start
45 * of the text following a "sentence".
49 * v_sentencef -- [count])
50 * Move forward count sentences.
52 * PUBLIC: int v_sentencef(SCR *, VICMD *);
55 v_sentencef(SCR *sp, VICMD *vp)
57 enum { BLANK, NONE, PERIOD } state;
62 cs.cs_lno = vp->m_start.lno;
63 cs.cs_cno = vp->m_start.cno;
67 cnt = F_ISSET(vp, VC_C1SET) ? vp->count : 1;
71 * If in white-space, the next start of sentence counts as one.
72 * This may not handle " . " correctly, but it's real unclear
73 * what correctly means in that case.
75 if (cs.cs_flags == CS_EMP || (cs.cs_flags == 0 && isblank(cs.cs_ch))) {
76 if (cs_fblank(sp, &cs))
79 if (vp->m_start.lno != cs.cs_lno ||
80 vp->m_start.cno != cs.cs_cno)
86 for (state = NONE;;) {
89 if (cs.cs_flags == CS_EOF)
91 if (cs.cs_flags == CS_EOL) {
92 if ((state == PERIOD || state == BLANK) && --cnt == 0) {
95 if (cs.cs_flags == 0 &&
96 isblank(cs.cs_ch) && cs_fblank(sp, &cs))
103 if (cs.cs_flags == CS_EMP) { /* An EMP is two sentences. */
106 if (cs_fblank(sp, &cs))
131 if (state == PERIOD) {
135 if (state == BLANK && --cnt == 0) {
136 if (cs_fblank(sp, &cs))
147 /* EOF is a movement sink, but it's an error not to have moved. */
148 if (vp->m_start.lno == cs.cs_lno && vp->m_start.cno == cs.cs_cno) {
153 okret: vp->m_stop.lno = cs.cs_lno;
154 vp->m_stop.cno = cs.cs_cno;
158 * Historic, uh, features, yeah, that's right, call 'em features.
159 * If the starting and ending cursor positions are at the first
160 * column in their lines, i.e. the movement is cutting entire lines,
161 * the buffer is in line mode, and the ending position is the last
162 * character of the previous line. Note check to make sure that
163 * it's not within a single line.
165 * Non-motion commands move to the end of the range. Delete and
166 * yank stay at the start. Ignore others. Adjust the end of the
167 * range for motion commands.
170 if (vp->m_start.cno == 0 &&
171 (cs.cs_flags != 0 || vp->m_stop.cno == 0)) {
172 if (vp->m_start.lno < vp->m_stop.lno) {
174 --vp->m_stop.lno, DBG_FATAL, NULL, &len))
176 vp->m_stop.cno = len ? len - 1 : 0;
181 vp->m_final = vp->m_start;
183 vp->m_final = vp->m_stop;
188 * v_sentenceb -- [count](
189 * Move backward count sentences.
191 * PUBLIC: int v_sentenceb(SCR *, VICMD *);
194 v_sentenceb(SCR *sp, VICMD *vp)
204 * Historic vi permitted the user to hit SOF repeatedly.
206 if (vp->m_start.lno == 1 && vp->m_start.cno == 0)
209 cs.cs_lno = vp->m_start.lno;
210 cs.cs_cno = vp->m_start.cno;
211 if (cs_init(sp, &cs))
214 cnt = F_ISSET(vp, VC_C1SET) ? vp->count : 1;
218 * In empty lines, skip to the previous non-white-space character.
219 * If in text, skip to the prevous white-space character. Believe
220 * it or not, in the paragraph:
223 * if the cursor is on the 'A' or 'B', ( moves to the 'a'. If it
224 * is on the ' ', 'C' or 'D', it moves to the 'A'. Yes, Virginia,
225 * Berkeley was once a major center of drug activity.
227 if (cs.cs_flags == CS_EMP) {
228 if (cs_bblank(sp, &cs))
231 if (cs_prev(sp, &cs))
233 if (cs.cs_flags != CS_EOL)
236 } else if (cs.cs_flags == 0 && !isblank(cs.cs_ch))
238 if (cs_prev(sp, &cs))
240 if (cs.cs_flags != 0 || isblank(cs.cs_ch))
245 if (cs_prev(sp, &cs))
247 if (cs.cs_flags == CS_SOF) /* SOF is a movement sink. */
249 if (cs.cs_flags == CS_EOL) {
253 if (cs.cs_flags == CS_EMP) {
256 if (cs_bblank(sp, &cs))
265 if (!last || --cnt != 0) {
270 ret: slno = cs.cs_lno;
274 * Move to the start of the sentence, skipping blanks
275 * and special characters.
278 if (cs_next(sp, &cs))
280 } while (!cs.cs_flags &&
281 (cs.cs_ch == ')' || cs.cs_ch == ']' ||
282 cs.cs_ch == '"' || cs.cs_ch == '\''));
283 if ((cs.cs_flags || isblank(cs.cs_ch)) &&
288 * If it was ". xyz", with the cursor on the 'x', or
289 * "end. ", with the cursor in the spaces, or the
290 * beginning of a sentence preceded by an empty line,
291 * we can end up where we started. Fix it.
293 if (vp->m_start.lno != cs.cs_lno ||
294 vp->m_start.cno != cs.cs_cno)
298 * Well, if an empty line preceded possible blanks
299 * and the sentence, it could be a real sentence.
302 if (cs_prev(sp, &cs))
304 if (cs.cs_flags == CS_EOL)
306 if (cs.cs_flags == 0 && isblank(cs.cs_ch))
310 if (cs.cs_flags == CS_EMP)
313 /* But it wasn't; try again. */
324 cs.cs_flags == CS_EOL || isblank(cs.cs_ch) ||
325 cs.cs_ch == ')' || cs.cs_ch == ']' ||
326 cs.cs_ch == '"' || cs.cs_ch == '\'' ? 1 : 0;
330 okret: vp->m_stop.lno = cs.cs_lno;
331 vp->m_stop.cno = cs.cs_cno;
335 * If the starting and stopping cursor positions are at the first
336 * columns in the line, i.e. the movement is cutting an entire line,
337 * the buffer is in line mode, and the starting position is the last
338 * character of the previous line.
340 * All commands move to the end of the range. Adjust the start of
341 * the range for motion commands.
344 if (vp->m_start.cno == 0 &&
345 (cs.cs_flags != 0 || vp->m_stop.cno == 0)) {
347 --vp->m_start.lno, DBG_FATAL, NULL, &len))
349 vp->m_start.cno = len ? len - 1 : 0;
353 vp->m_final = vp->m_stop;