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-rw-r--r--vi/v_sentence.c359
1 files changed, 359 insertions, 0 deletions
diff --git a/vi/v_sentence.c b/vi/v_sentence.c
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--- /dev/null
+++ b/vi/v_sentence.c
@@ -0,0 +1,359 @@
+/*-
+ * Copyright (c) 1992, 1993, 1994
+ * The Regents of the University of California. All rights reserved.
+ * Copyright (c) 1992, 1993, 1994, 1995, 1996
+ * Keith Bostic. All rights reserved.
+ *
+ * See the LICENSE file for redistribution information.
+ */
+
+#include "config.h"
+
+#ifndef lint
+static const char sccsid[] = "@(#)v_sentence.c 10.7 (Berkeley) 3/6/96";
+#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 <stdio.h>
+
+#include "../common/common.h"
+#include "vi.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.
+ *
+ * PUBLIC: int v_sentencef __P((SCR *, VICMD *));
+ */
+int
+v_sentencef(sp, vp)
+ SCR *sp;
+ VICMD *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 starting and ending cursor positions are at the first
+ * column in their lines, i.e. the movement is cutting entire lines,
+ * the buffer is in line mode, and the ending position is the last
+ * character of the previous line. Note check to make sure that
+ * it's not within a single 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 (vp->m_start.lno < vp->m_stop.lno) {
+ if (db_get(sp,
+ --vp->m_stop.lno, DBG_FATAL, NULL, &len))
+ 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.
+ *
+ * PUBLIC: int v_sentenceb __P((SCR *, VICMD *));
+ */
+int
+v_sentenceb(sp, vp)
+ SCR *sp;
+ VICMD *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 (db_get(sp,
+ --vp->m_start.lno, DBG_FATAL, NULL, &len))
+ 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);
+}
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