356 lines
8.3 KiB
C
356 lines
8.3 KiB
C
/*-
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* Copyright (c) 1992, 1993, 1994
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* The Regents of the University of California. All rights reserved.
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* Copyright (c) 1992, 1993, 1994, 1995, 1996
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* Keith Bostic. All rights reserved.
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*
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* See the LICENSE file for redistribution information.
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*/
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#include "config.h"
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#ifndef lint
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static const char sccsid[] = "$Id: v_sentence.c,v 10.9 2001/06/25 15:19:35 skimo Exp $";
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#endif /* not lint */
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#include <sys/types.h>
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#include <sys/queue.h>
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#include <sys/time.h>
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#include <bitstring.h>
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#include <ctype.h>
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#include <limits.h>
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#include <stdio.h>
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#include "../common/common.h"
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#include "vi.h"
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/*
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* !!!
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* In historic vi, a sentence was delimited by a '.', '?' or '!' character
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* followed by TWO spaces or a newline. One or more empty lines was also
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* treated as a separate sentence. The Berkeley documentation for historical
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* vi states that any number of ')', ']', '"' and '\'' characters can be
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* between the delimiter character and the spaces or end of line, however,
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* the historical implementation did not handle additional '"' characters.
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* We follow the documentation here, not the implementation.
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*
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* Once again, historical vi didn't do sentence movements associated with
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* counts consistently, mostly in the presence of lines containing only
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* white-space characters.
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*
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* This implementation also permits a single tab to delimit sentences, and
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* treats lines containing only white-space characters as empty lines.
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* Finally, tabs are eaten (along with spaces) when skipping to the start
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* of the text following a "sentence".
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*/
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/*
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* v_sentencef -- [count])
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* Move forward count sentences.
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*
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* PUBLIC: int v_sentencef(SCR *, VICMD *);
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*/
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int
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v_sentencef(SCR *sp, VICMD *vp)
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{
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enum { BLANK, NONE, PERIOD } state;
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VCS cs;
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size_t len;
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u_long cnt;
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cs.cs_lno = vp->m_start.lno;
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cs.cs_cno = vp->m_start.cno;
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if (cs_init(sp, &cs))
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return (1);
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cnt = F_ISSET(vp, VC_C1SET) ? vp->count : 1;
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/*
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* !!!
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* If in white-space, the next start of sentence counts as one.
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* This may not handle " . " correctly, but it's real unclear
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* what correctly means in that case.
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*/
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if (cs.cs_flags == CS_EMP || (cs.cs_flags == 0 && isblank(cs.cs_ch))) {
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if (cs_fblank(sp, &cs))
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return (1);
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if (--cnt == 0) {
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if (vp->m_start.lno != cs.cs_lno ||
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vp->m_start.cno != cs.cs_cno)
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goto okret;
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return (1);
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}
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}
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for (state = NONE;;) {
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if (cs_next(sp, &cs))
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return (1);
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if (cs.cs_flags == CS_EOF)
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break;
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if (cs.cs_flags == CS_EOL) {
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if ((state == PERIOD || state == BLANK) && --cnt == 0) {
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if (cs_next(sp, &cs))
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return (1);
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if (cs.cs_flags == 0 &&
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isblank(cs.cs_ch) && cs_fblank(sp, &cs))
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return (1);
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goto okret;
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}
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state = NONE;
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continue;
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}
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if (cs.cs_flags == CS_EMP) { /* An EMP is two sentences. */
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if (--cnt == 0)
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goto okret;
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if (cs_fblank(sp, &cs))
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return (1);
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if (--cnt == 0)
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goto okret;
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state = NONE;
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continue;
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}
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switch (cs.cs_ch) {
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case '.':
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case '?':
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case '!':
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state = PERIOD;
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break;
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case ')':
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case ']':
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case '"':
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case '\'':
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if (state != PERIOD)
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state = NONE;
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break;
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case '\t':
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if (state == PERIOD)
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state = BLANK;
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/* FALLTHROUGH */
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case ' ':
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if (state == PERIOD) {
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state = BLANK;
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break;
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}
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if (state == BLANK && --cnt == 0) {
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if (cs_fblank(sp, &cs))
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return (1);
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goto okret;
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}
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/* FALLTHROUGH */
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default:
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state = NONE;
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break;
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}
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}
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/* EOF is a movement sink, but it's an error not to have moved. */
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if (vp->m_start.lno == cs.cs_lno && vp->m_start.cno == cs.cs_cno) {
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v_eof(sp, NULL);
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return (1);
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}
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okret: vp->m_stop.lno = cs.cs_lno;
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vp->m_stop.cno = cs.cs_cno;
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/*
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* !!!
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* Historic, uh, features, yeah, that's right, call 'em features.
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* If the starting and ending cursor positions are at the first
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* column in their lines, i.e. the movement is cutting entire lines,
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* the buffer is in line mode, and the ending position is the last
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* character of the previous line. Note check to make sure that
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* it's not within a single line.
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*
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* Non-motion commands move to the end of the range. Delete and
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* yank stay at the start. Ignore others. Adjust the end of the
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* range for motion commands.
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*/
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if (ISMOTION(vp)) {
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if (vp->m_start.cno == 0 &&
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(cs.cs_flags != 0 || vp->m_stop.cno == 0)) {
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if (vp->m_start.lno < vp->m_stop.lno) {
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if (db_get(sp,
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--vp->m_stop.lno, DBG_FATAL, NULL, &len))
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return (1);
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vp->m_stop.cno = len ? len - 1 : 0;
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}
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F_SET(vp, VM_LMODE);
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} else
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--vp->m_stop.cno;
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vp->m_final = vp->m_start;
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} else
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vp->m_final = vp->m_stop;
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return (0);
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}
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/*
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* v_sentenceb -- [count](
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* Move backward count sentences.
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*
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* PUBLIC: int v_sentenceb(SCR *, VICMD *);
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*/
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int
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v_sentenceb(SCR *sp, VICMD *vp)
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{
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VCS cs;
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recno_t slno;
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size_t len, scno;
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u_long cnt;
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int last;
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/*
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* !!!
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* Historic vi permitted the user to hit SOF repeatedly.
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*/
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if (vp->m_start.lno == 1 && vp->m_start.cno == 0)
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return (0);
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cs.cs_lno = vp->m_start.lno;
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cs.cs_cno = vp->m_start.cno;
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if (cs_init(sp, &cs))
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return (1);
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cnt = F_ISSET(vp, VC_C1SET) ? vp->count : 1;
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/*
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* !!!
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* In empty lines, skip to the previous non-white-space character.
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* If in text, skip to the prevous white-space character. Believe
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* it or not, in the paragraph:
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* ab cd.
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* AB CD.
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* if the cursor is on the 'A' or 'B', ( moves to the 'a'. If it
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* is on the ' ', 'C' or 'D', it moves to the 'A'. Yes, Virginia,
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* Berkeley was once a major center of drug activity.
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*/
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if (cs.cs_flags == CS_EMP) {
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if (cs_bblank(sp, &cs))
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return (1);
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for (;;) {
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if (cs_prev(sp, &cs))
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return (1);
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if (cs.cs_flags != CS_EOL)
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break;
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}
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} else if (cs.cs_flags == 0 && !isblank(cs.cs_ch))
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for (;;) {
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if (cs_prev(sp, &cs))
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return (1);
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if (cs.cs_flags != 0 || isblank(cs.cs_ch))
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break;
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}
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for (last = 0;;) {
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if (cs_prev(sp, &cs))
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return (1);
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if (cs.cs_flags == CS_SOF) /* SOF is a movement sink. */
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break;
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if (cs.cs_flags == CS_EOL) {
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last = 1;
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continue;
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}
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if (cs.cs_flags == CS_EMP) {
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if (--cnt == 0)
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goto ret;
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if (cs_bblank(sp, &cs))
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return (1);
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last = 0;
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continue;
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}
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switch (cs.cs_ch) {
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case '.':
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case '?':
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case '!':
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if (!last || --cnt != 0) {
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last = 0;
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continue;
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}
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ret: slno = cs.cs_lno;
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scno = cs.cs_cno;
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/*
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* Move to the start of the sentence, skipping blanks
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* and special characters.
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*/
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do {
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if (cs_next(sp, &cs))
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return (1);
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} while (!cs.cs_flags &&
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(cs.cs_ch == ')' || cs.cs_ch == ']' ||
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cs.cs_ch == '"' || cs.cs_ch == '\''));
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if ((cs.cs_flags || isblank(cs.cs_ch)) &&
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cs_fblank(sp, &cs))
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return (1);
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/*
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* If it was ". xyz", with the cursor on the 'x', or
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* "end. ", with the cursor in the spaces, or the
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* beginning of a sentence preceded by an empty line,
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* we can end up where we started. Fix it.
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*/
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if (vp->m_start.lno != cs.cs_lno ||
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vp->m_start.cno != cs.cs_cno)
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goto okret;
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/*
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* Well, if an empty line preceded possible blanks
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* and the sentence, it could be a real sentence.
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*/
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for (;;) {
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if (cs_prev(sp, &cs))
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return (1);
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if (cs.cs_flags == CS_EOL)
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continue;
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if (cs.cs_flags == 0 && isblank(cs.cs_ch))
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continue;
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break;
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}
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if (cs.cs_flags == CS_EMP)
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goto okret;
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/* But it wasn't; try again. */
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++cnt;
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cs.cs_lno = slno;
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cs.cs_cno = scno;
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last = 0;
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break;
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case '\t':
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last = 1;
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break;
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default:
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last =
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cs.cs_flags == CS_EOL || isblank(cs.cs_ch) ||
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cs.cs_ch == ')' || cs.cs_ch == ']' ||
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cs.cs_ch == '"' || cs.cs_ch == '\'' ? 1 : 0;
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}
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}
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okret: vp->m_stop.lno = cs.cs_lno;
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vp->m_stop.cno = cs.cs_cno;
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/*
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* !!!
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* If the starting and stopping cursor positions are at the first
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* columns in the line, i.e. the movement is cutting an entire line,
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* the buffer is in line mode, and the starting position is the last
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* character of the previous line.
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*
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* All commands move to the end of the range. Adjust the start of
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* the range for motion commands.
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*/
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if (ISMOTION(vp))
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if (vp->m_start.cno == 0 &&
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(cs.cs_flags != 0 || vp->m_stop.cno == 0)) {
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if (db_get(sp,
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--vp->m_start.lno, DBG_FATAL, NULL, &len))
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return (1);
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vp->m_start.cno = len ? len - 1 : 0;
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F_SET(vp, VM_LMODE);
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} else
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--vp->m_start.cno;
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vp->m_final = vp->m_stop;
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return (0);
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}
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