251 lines
6.3 KiB
C
251 lines
6.3 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_section.c,v 10.10 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 <limits.h>
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#include <stdio.h>
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#include <string.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, the section commands ignored empty lines, unlike the
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* paragraph commands, which was probably okay. However, they also moved
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* to the start of the last line when there where no more sections instead
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* of the end of the last line like the paragraph commands. I've changed
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* the latter behavior to match the paragraph commands.
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*
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* In historic vi, a section was defined as the first character(s) of the
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* line matching, which could be followed by anything. This implementation
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* follows that historic practice.
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*
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* !!!
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* The historic vi documentation (USD:15-10) claimed:
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* The section commands interpret a preceding count as a different
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* window size in which to redraw the screen at the new location,
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* and this window size is the base size for newly drawn windows
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* until another size is specified. This is very useful if you are
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* on a slow terminal ...
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*
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* I can't get the 4BSD vi to do this, it just beeps at me. For now, a
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* count to the section commands simply repeats the command.
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*/
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/*
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* v_sectionf -- [count]]]
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* Move forward count sections/functions.
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*
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* !!!
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* Using ]] as a motion command was a bit special, historically. It could
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* match } as well as the usual { and section values. If it matched a { or
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* a section, it did NOT include the matched line. If it matched a }, it
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* did include the line. No clue why.
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*
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* PUBLIC: int v_sectionf(SCR *, VICMD *);
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*/
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int
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v_sectionf(SCR *sp, VICMD *vp)
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{
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recno_t cnt, lno;
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size_t len;
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CHAR_T *p;
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char *list, *lp;
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/* Get the macro list. */
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if ((list = O_STR(sp, O_SECTIONS)) == NULL)
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return (1);
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/*
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* !!!
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* If the starting cursor position is at or before any non-blank
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* characters in the line, i.e. the movement is cutting all of the
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* line's text, the buffer is in line mode. It's a lot easier to
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* check here, because we know that the end is going to be the start
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* or end of a line.
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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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F_SET(vp, VM_LMODE);
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else {
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vp->m_stop = vp->m_start;
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vp->m_stop.cno = 0;
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if (nonblank(sp, vp->m_stop.lno, &vp->m_stop.cno))
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return (1);
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if (vp->m_start.cno <= vp->m_stop.cno)
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F_SET(vp, VM_LMODE);
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}
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cnt = F_ISSET(vp, VC_C1SET) ? vp->count : 1;
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for (lno = vp->m_start.lno; !db_get(sp, ++lno, 0, &p, &len);) {
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if (len == 0)
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continue;
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if (p[0] == '{' || (ISMOTION(vp) && p[0] == '}')) {
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if (!--cnt) {
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if (p[0] == '{')
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goto adjust1;
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goto adjust2;
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}
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continue;
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}
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/*
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* !!!
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* Historic documentation (USD:15-11, 4.2) said that formfeed
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* characters (^L) in the first column delimited sections.
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* The historic code mentions formfeed characters, but never
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* implements them. Seems reasonable, do it.
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*/
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if (p[0] == '\014') {
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if (!--cnt)
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goto adjust1;
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continue;
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}
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if (p[0] != '.' || len < 2)
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continue;
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for (lp = list; *lp != '\0'; lp += 2 * sizeof(*lp))
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if (lp[0] == p[1] &&
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((lp[1] == ' ' && len == 2) || lp[1] == p[2]) &&
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!--cnt) {
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/*
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* !!!
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* If not cutting this line, adjust to the end
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* of the previous one. Otherwise, position to
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* column 0.
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*/
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adjust1: if (ISMOTION(vp))
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goto ret1;
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adjust2: vp->m_stop.lno = lno;
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vp->m_stop.cno = 0;
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goto ret2;
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}
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}
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/* If moving forward, reached EOF, check to see if we started there. */
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if (vp->m_start.lno == lno - 1) {
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v_eof(sp, NULL);
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return (1);
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}
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ret1: if (db_get(sp, --lno, DBG_FATAL, NULL, &len))
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return (1);
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vp->m_stop.lno = lno;
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vp->m_stop.cno = len ? len - 1 : 0;
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/*
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* Non-motion commands go to the end of the range. Delete and
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* yank stay at the start of the range. Ignore others.
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*/
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ret2: if (ISMOTION(vp)) {
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vp->m_final = vp->m_start;
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if (F_ISSET(vp, VM_LMODE))
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vp->m_final.cno = 0;
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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_sectionb -- [count][[
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* Move backward count sections/functions.
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*
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* PUBLIC: int v_sectionb(SCR *, VICMD *);
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*/
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int
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v_sectionb(SCR *sp, VICMD *vp)
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{
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size_t len;
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recno_t cnt, lno;
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CHAR_T *p;
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char *list, *lp;
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/* An empty file or starting from line 1 is always illegal. */
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if (vp->m_start.lno <= 1) {
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v_sof(sp, NULL);
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return (1);
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}
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/* Get the macro list. */
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if ((list = O_STR(sp, O_SECTIONS)) == NULL)
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return (1);
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cnt = F_ISSET(vp, VC_C1SET) ? vp->count : 1;
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for (lno = vp->m_start.lno; !db_get(sp, --lno, 0, &p, &len);) {
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if (len == 0)
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continue;
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if (p[0] == '{') {
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if (!--cnt)
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goto adjust1;
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continue;
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}
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/*
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* !!!
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* Historic documentation (USD:15-11, 4.2) said that formfeed
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* characters (^L) in the first column delimited sections.
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* The historic code mentions formfeed characters, but never
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* implements them. Seems reasonable, do it.
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*/
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if (p[0] == '\014') {
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if (!--cnt)
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goto adjust1;
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continue;
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}
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if (p[0] != '.' || len < 2)
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continue;
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for (lp = list; *lp != '\0'; lp += 2 * sizeof(*lp))
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if (lp[0] == p[1] &&
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((lp[1] == ' ' && len == 2) || lp[1] == p[2]) &&
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!--cnt) {
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adjust1: vp->m_stop.lno = lno;
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vp->m_stop.cno = 0;
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goto ret1;
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}
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}
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/*
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* If moving backward, reached SOF, which is a movement sink.
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* We already checked for starting there.
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*/
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vp->m_stop.lno = 1;
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vp->m_stop.cno = 0;
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/*
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* All commands move to the end of the range.
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*
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* !!!
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* Historic practice is the section cut was in line mode if it started
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* from column 0 and was in the backward direction. Otherwise, left
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* motion commands adjust the starting point to the character before
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* the current one. What makes this worse is that if it cut to line
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* mode it also went to the first non-<blank>.
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*/
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ret1: if (vp->m_start.cno == 0) {
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F_CLR(vp, VM_RCM_MASK);
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F_SET(vp, VM_RCM_SETFNB);
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--vp->m_start.lno;
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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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