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 <errno.h>
18#include <limits.h>
19#include <stdio.h>
20#include <stdlib.h>
21#include <string.h>
22
23#include "../common/common.h"
24#include "vi.h"
25
26#define	INTEXT_CHECK do {						\
27	if (len == 0 || v_isempty(p, len)) {				\
28		if (!--cnt)						\
29			goto found;					\
30		pstate = P_INBLANK;					\
31	}								\
32	/*								\
33	 * !!!								\
34	 * Historic documentation (USD:15-11, 4.2) said that formfeed	\
35	 * characters (^L) in the first column delimited paragraphs.	\
36	 * The historic vi code mentions formfeed characters, but never	\
37	 * implements them.  It seems reasonable, do it.		\
38	 */								\
39	if (p[0] == '\014') {						\
40		if (!--cnt)						\
41			goto found;					\
42		if (pstate == P_INTEXT && !--cnt)			\
43			goto found;					\
44		continue;						\
45	}								\
46	if (p[0] != '.' || len < 2)					\
47		continue;						\
48	for (lp = VIP(sp)->ps; *lp != '\0'; lp += 2)			\
49		if (lp[0] == p[1] &&					\
50		    (lp[1] == ' ' && len == 2 || lp[1] == p[2])) {	\
51			if (!--cnt)					\
52				goto found;				\
53			if (pstate == P_INTEXT && !--cnt)		\
54				goto found;				\
55		}							\
56} while (0)
57
58/*
59 * v_paragraphf -- [count]}
60 *	Move forward count paragraphs.
61 *
62 * Paragraphs are empty lines after text, formfeed characters, or values
63 * from the paragraph or section options.
64 *
65 * PUBLIC: int v_paragraphf(SCR *, VICMD *);
66 */
67int
68v_paragraphf(SCR *sp, VICMD *vp)
69{
70	enum { P_INTEXT, P_INBLANK } pstate;
71	size_t lastlen, len;
72	recno_t cnt, lastlno, lno;
73	int isempty;
74	CHAR_T *p;
75	char *lp;
76
77	/*
78	 * !!!
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
83	 * or end of a line.
84	 *
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.
90	 */
91	if (ISMOTION(vp)) {
92		if (vp->m_start.cno == 0)
93			F_SET(vp, VM_LMODE);
94		else {
95			vp->m_stop = vp->m_start;
96			vp->m_stop.cno = 0;
97			if (nonblank(sp, vp->m_stop.lno, &vp->m_stop.cno))
98				return (1);
99			if (vp->m_start.cno <= vp->m_stop.cno)
100				F_SET(vp, VM_LMODE);
101		}
102	}
103
104	/* Figure out what state we're currently in. */
105	lno = vp->m_start.lno;
106	if (db_get(sp, lno, 0, &p, &len))
107		goto eof;
108
109	/*
110	 * If we start in text, we want to switch states
111	 * (2 * N - 1) times, in non-text, (2 * N) times.
112	 */
113	cnt = F_ISSET(vp, VC_C1SET) ? vp->count : 1;
114	cnt *= 2;
115	if (len == 0 || v_isempty(p, len))
116		pstate = P_INBLANK;
117	else {
118		--cnt;
119		pstate = P_INTEXT;
120	}
121
122	for (;;) {
123		lastlno = lno;
124		lastlen = len;
125		if (db_get(sp, ++lno, 0, &p, &len))
126			goto eof;
127		switch (pstate) {
128		case P_INTEXT:
129			INTEXT_CHECK;
130			break;
131		case P_INBLANK:
132			if (len == 0 || v_isempty(p, len))
133				break;
134			if (--cnt) {
135				pstate = P_INTEXT;
136				break;
137			}
138			/*
139			 * !!!
140			 * Non-motion commands move to the end of the range,
141			 * delete and yank stay at the start.  Ignore others.
142			 * Adjust the end of the range for motion commands;
143			 * historically, a motion component was to the end of
144			 * the previous line, whereas the movement command was
145			 * to the start of the new "paragraph".
146			 */
147found:			if (ISMOTION(vp)) {
148				vp->m_stop.lno = lastlno;
149				vp->m_stop.cno = lastlen ? lastlen - 1 : 0;
150				vp->m_final = vp->m_start;
151			} else {
152				vp->m_stop.lno = lno;
153				vp->m_stop.cno = 0;
154				vp->m_final = vp->m_stop;
155			}
156			return (0);
157		default:
158			abort();
159		}
160	}
161
162	/*
163	 * !!!
164	 * Adjust end of the range for motion commands; EOF is a movement
165	 * sink.  The } command historically moved to the end of the last
166	 * line, not the beginning, from any position before the end of the
167	 * last line.  It also historically worked on empty files, so we
168	 * have to make it okay.
169	 */
170eof:	if (vp->m_start.lno == lno || vp->m_start.lno == lno - 1) {
171		if (db_eget(sp, vp->m_start.lno, &p, &len, &isempty)) {
172			if (!isempty)
173				return (1);
174			vp->m_start.cno = 0;
175			return (0);
176		}
177		if (vp->m_start.cno == (len ? len - 1 : 0)) {
178			v_eof(sp, NULL);
179			return (1);
180		}
181	}
182	/*
183	 * !!!
184	 * Non-motion commands move to the end of the range, delete
185	 * and yank stay at the start.  Ignore others.
186	 *
187	 * If deleting the line (which happens if deleting to EOF), then
188	 * cursor movement is to the first nonblank.
189	 */
190	if (ISMOTION(vp) && ISCMD(vp->rkp, 'd')) {
191		F_CLR(vp, VM_RCM_MASK);
192		F_SET(vp, VM_RCM_SETFNB);
193	}
194	vp->m_stop.lno = lno - 1;
195	vp->m_stop.cno = len ? len - 1 : 0;
196	vp->m_final = ISMOTION(vp) ? vp->m_start : vp->m_stop;
197	return (0);
198}
199
200/*
201 * v_paragraphb -- [count]{
202 *	Move backward count paragraphs.
203 *
204 * PUBLIC: int v_paragraphb(SCR *, VICMD *);
205 */
206int
207v_paragraphb(SCR *sp, VICMD *vp)
208{
209	enum { P_INTEXT, P_INBLANK } pstate;
210	size_t len;
211	recno_t cnt, lno;
212	CHAR_T *p;
213	char *lp;
214
215	/*
216	 * !!!
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.
220	 *
221	 * The { command historically moved to the beginning of the first
222	 * line if invoked on the first line.
223	 *
224	 * !!!
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.
230	 *
231	 * Correct for a left motion component while we're thinking about it.
232	 */
233	lno = vp->m_start.lno;
234
235	if (ISMOTION(vp)) {
236		if (vp->m_start.cno == 0) {
237			if (vp->m_start.lno == 1) {
238				v_sof(sp, &vp->m_start);
239				return (1);
240			} else
241				--vp->m_start.lno;
242			F_SET(vp, VM_LMODE);
243		} else
244			--vp->m_start.cno;
245	}
246
247	if (vp->m_start.lno <= 1)
248		goto sof;
249
250	/* Figure out what state we're currently in. */
251	if (db_get(sp, lno, 0, &p, &len))
252		goto sof;
253
254	/*
255	 * If we start in text, we want to switch states
256	 * (2 * N - 1) times, in non-text, (2 * N) times.
257	 */
258	cnt = F_ISSET(vp, VC_C1SET) ? vp->count : 1;
259	cnt *= 2;
260	if (len == 0 || v_isempty(p, len))
261		pstate = P_INBLANK;
262	else {
263		--cnt;
264		pstate = P_INTEXT;
265
266		/*
267		 * !!!
268		 * If the starting cursor is past the first column,
269		 * the current line is checked for a paragraph.
270		 */
271		if (vp->m_start.cno > 0)
272			++lno;
273	}
274
275	for (;;) {
276		if (db_get(sp, --lno, 0, &p, &len))
277			goto sof;
278		switch (pstate) {
279		case P_INTEXT:
280			INTEXT_CHECK;
281			break;
282		case P_INBLANK:
283			if (len != 0 && !v_isempty(p, len)) {
284				if (!--cnt)
285					goto found;
286				pstate = P_INTEXT;
287			}
288			break;
289		default:
290			abort();
291		}
292	}
293
294	/* SOF is a movement sink. */
295sof:	lno = 1;
296
297found:	vp->m_stop.lno = lno;
298	vp->m_stop.cno = 0;
299
300	/*
301	 * All commands move to the end of the range.  (We already
302	 * adjusted the start of the range for motion commands).
303	 */
304	vp->m_final = vp->m_stop;
305	return (0);
306}
307
308/*
309 * v_buildps --
310 *	Build the paragraph command search pattern.
311 *
312 * PUBLIC: int v_buildps(SCR *, char *, char *);
313 */
314int
315v_buildps(SCR *sp, char *p_p, char *s_p)
316{
317	VI_PRIVATE *vip;
318	size_t p_len, s_len;
319	char *p;
320
321	/*
322	 * The vi paragraph command searches for either a paragraph or
323	 * section option macro.
324	 */
325	p_len = p_p == NULL ? 0 : strlen(p_p);
326	s_len = s_p == NULL ? 0 : strlen(s_p);
327
328	if (p_len == 0 && s_len == 0)
329		return (0);
330
331	MALLOC_RET(sp, p, p_len + s_len + 1);
332
333	vip = VIP(sp);
334	free(vip->ps);
335
336	if (p_p != NULL)
337		memmove(p, p_p, p_len + 1);
338	if (s_p != NULL)
339		memmove(p + p_len, s_p, s_len + 1);
340	vip->ps = p;
341	return (0);
342}
343