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BSD 4_4_Lite2 release
[unix-history] / usr / src / contrib / nvi.1.43 / vi / v_sentence.c
/*-
* Copyright (c) 1992, 1993, 1994
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef lint
static char sccsid[] = "@(#)v_sentence.c 9.1 (Berkeley) 11/9/94";
#endif /* not lint */
#include <sys/types.h>
#include <sys/queue.h>
#include <sys/time.h>
#include <bitstring.h>
#include <ctype.h>
#include <limits.h>
#include <signal.h>
#include <stdio.h>
#include <termios.h>
#include "compat.h"
#include <db.h>
#include <regex.h>
#include "vi.h"
#include "vcmd.h"
/*
* !!!
* In historic vi, a sentence was delimited by a '.', '?' or '!' character
* followed by TWO spaces or a newline. One or more empty lines was also
* treated as a separate sentence. The Berkeley documentation for historical
* vi states that any number of ')', ']', '"' and '\'' characters can be
* between the delimiter character and the spaces or end of line, however,
* the historical implementation did not handle additional '"' characters.
* We follow the documentation here, not the implementation.
*
* Once again, historical vi didn't do sentence movements associated with
* counts consistently, mostly in the presence of lines containing only
* white-space characters.
*
* This implementation also permits a single tab to delimit sentences, and
* treats lines containing only white-space characters as empty lines.
* Finally, tabs are eaten (along with spaces) when skipping to the start
* of the text following a "sentence".
*/
/*
* v_sentencef -- [count])
* Move forward count sentences.
*/
int
v_sentencef(sp, vp)
SCR *sp;
VICMDARG *vp;
{
enum { BLANK, NONE, PERIOD } state;
VCS cs;
size_t len;
u_long cnt;
cs.cs_lno = vp->m_start.lno;
cs.cs_cno = vp->m_start.cno;
if (cs_init(sp, &cs))
return (1);
cnt = F_ISSET(vp, VC_C1SET) ? vp->count : 1;
/*
* !!!
* If in white-space, the next start of sentence counts as one.
* This may not handle " . " correctly, but it's real unclear
* what correctly means in that case.
*/
if (cs.cs_flags == CS_EMP || cs.cs_flags == 0 && isblank(cs.cs_ch)) {
if (cs_fblank(sp, &cs))
return (1);
if (--cnt == 0) {
if (vp->m_start.lno != cs.cs_lno ||
vp->m_start.cno != cs.cs_cno)
goto okret;
return (1);
}
}
for (state = NONE;;) {
if (cs_next(sp, &cs))
return (1);
if (cs.cs_flags == CS_EOF)
break;
if (cs.cs_flags == CS_EOL) {
if ((state == PERIOD || state == BLANK) && --cnt == 0) {
if (cs_next(sp, &cs))
return (1);
if (cs.cs_flags == 0 &&
isblank(cs.cs_ch) && cs_fblank(sp, &cs))
return (1);
goto okret;
}
state = NONE;
continue;
}
if (cs.cs_flags == CS_EMP) { /* An EMP is two sentences. */
if (--cnt == 0)
goto okret;
if (cs_fblank(sp, &cs))
return (1);
if (--cnt == 0)
goto okret;
state = NONE;
continue;
}
switch (cs.cs_ch) {
case '.':
case '?':
case '!':
state = PERIOD;
break;
case ')':
case ']':
case '"':
case '\'':
if (state != PERIOD)
state = NONE;
break;
case '\t':
if (state == PERIOD)
state = BLANK;
/* FALLTHROUGH */
case ' ':
if (state == PERIOD) {
state = BLANK;
break;
}
if (state == BLANK && --cnt == 0) {
if (cs_fblank(sp, &cs))
return (1);
goto okret;
}
/* FALLTHROUGH */
default:
state = NONE;
break;
}
}
/* EOF is a movement sink, but it's an error not to have moved. */
if (vp->m_start.lno == cs.cs_lno && vp->m_start.cno == cs.cs_cno) {
v_eof(sp, NULL);
return (1);
}
okret: vp->m_stop.lno = cs.cs_lno;
vp->m_stop.cno = cs.cs_cno;
/*
* !!!
* Historic, uh, features, yeah, that's right, call 'em features.
* If the ending cursor position is at the first column in the
* line, i.e. the movement is cutting an entire line, the buffer
* is in line mode, and the ending position is the last character
* of the previous line.
*
* Non-motion commands move to the end of the range. Delete and
* yank stay at the start. Ignore others. Adjust the end of the
* range for motion commands.
*/
if (ISMOTION(vp)) {
if (vp->m_start.cno == 0 &&
(cs.cs_flags != 0 || vp->m_stop.cno == 0)) {
if (file_gline(sp, --vp->m_stop.lno, &len) == NULL) {
GETLINE_ERR(sp, vp->m_stop.lno);
return (1);
}
vp->m_stop.cno = len ? len - 1 : 0;
F_SET(vp, VM_LMODE);
} else
--vp->m_stop.cno;
vp->m_final = vp->m_start;
} else
vp->m_final = vp->m_stop;
return (0);
}
/*
* v_sentenceb -- [count](
* Move backward count sentences.
*/
int
v_sentenceb(sp, vp)
SCR *sp;
VICMDARG *vp;
{
VCS cs;
recno_t slno;
size_t len, scno;
u_long cnt;
int last;
/*
* !!!
* Historic vi permitted the user to hit SOF repeatedly.
*/
if (vp->m_start.lno == 1 && vp->m_start.cno == 0)
return (0);
cs.cs_lno = vp->m_start.lno;
cs.cs_cno = vp->m_start.cno;
if (cs_init(sp, &cs))
return (1);
cnt = F_ISSET(vp, VC_C1SET) ? vp->count : 1;
/*
* !!!
* In empty lines, skip to the previous non-white-space character.
* If in text, skip to the prevous white-space character. Believe
* it or not, in the paragraph:
* ab cd.
* AB CD.
* if the cursor is on the 'A' or 'B', ( moves to the 'a'. If it
* is on the ' ', 'C' or 'D', it moves to the 'A'. Yes, Virginia,
* Berkeley was once a major center of drug activity.
*/
if (cs.cs_flags == CS_EMP) {
if (cs_bblank(sp, &cs))
return (1);
for (;;) {
if (cs_prev(sp, &cs))
return (1);
if (cs.cs_flags != CS_EOL)
break;
}
} else if (cs.cs_flags == 0 && !isblank(cs.cs_ch))
for (;;) {
if (cs_prev(sp, &cs))
return (1);
if (cs.cs_flags != 0 || isblank(cs.cs_ch))
break;
}
for (last = 0;;) {
if (cs_prev(sp, &cs))
return (1);
if (cs.cs_flags == CS_SOF) /* SOF is a movement sink. */
break;
if (cs.cs_flags == CS_EOL) {
last = 1;
continue;
}
if (cs.cs_flags == CS_EMP) {
if (--cnt == 0)
goto ret;
if (cs_bblank(sp, &cs))
return (1);
last = 0;
continue;
}
switch (cs.cs_ch) {
case '.':
case '?':
case '!':
if (!last || --cnt != 0) {
last = 0;
continue;
}
ret: slno = cs.cs_lno;
scno = cs.cs_cno;
/*
* Move to the start of the sentence, skipping blanks
* and special characters.
*/
do {
if (cs_next(sp, &cs))
return (1);
} while (!cs.cs_flags &&
(cs.cs_ch == ')' || cs.cs_ch == ']' ||
cs.cs_ch == '"' || cs.cs_ch == '\''));
if ((cs.cs_flags || isblank(cs.cs_ch)) &&
cs_fblank(sp, &cs))
return (1);
/*
* If it was ". xyz", with the cursor on the 'x', or
* "end. ", with the cursor in the spaces, or the
* beginning of a sentence preceded by an empty line,
* we can end up where we started. Fix it.
*/
if (vp->m_start.lno != cs.cs_lno ||
vp->m_start.cno != cs.cs_cno)
goto okret;
/*
* Well, if an empty line preceded possible blanks
* and the sentence, it could be a real sentence.
*/
for (;;) {
if (cs_prev(sp, &cs))
return (1);
if (cs.cs_flags == CS_EOL)
continue;
if (cs.cs_flags == 0 && isblank(cs.cs_ch))
continue;
break;
}
if (cs.cs_flags == CS_EMP)
goto okret;
/* But it wasn't; try again. */
++cnt;
cs.cs_lno = slno;
cs.cs_cno = scno;
last = 0;
break;
case '\t':
last = 1;
break;
default:
last =
cs.cs_flags == CS_EOL || isblank(cs.cs_ch) ||
cs.cs_ch == ')' || cs.cs_ch == ']' ||
cs.cs_ch == '"' || cs.cs_ch == '\'' ? 1 : 0;
}
}
okret: vp->m_stop.lno = cs.cs_lno;
vp->m_stop.cno = cs.cs_cno;
/*
* !!!
* If the starting and stopping cursor positions are at the first
* columns in the line, i.e. the movement is cutting an entire line,
* the buffer is in line mode, and the starting position is the last
* character of the previous line.
*
* All commands move to the end of the range. Adjust the start of
* the range for motion commands.
*/
if (ISMOTION(vp))
if (vp->m_start.cno == 0 &&
(cs.cs_flags != 0 || vp->m_stop.cno == 0)) {
if (file_gline(sp, --vp->m_start.lno, &len) == NULL) {
GETLINE_ERR(sp, vp->m_start.lno);
return (1);
}
vp->m_start.cno = len ? len - 1 : 0;
F_SET(vp, VM_LMODE);
} else
--vp->m_start.cno;
vp->m_final = vp->m_stop;
return (0);
}
Continuous source code history from original PDP-7 UNIX to FreeBSD 2, the first fully unencumbered FreeBSD release.