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v_section.c

/*-
 * 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_section.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 <limits.h>
#include <stdio.h>
#include <string.h>

#include "../common/common.h"
#include "vi.h"

/*
 * !!!
 * In historic vi, the section commands ignored empty lines, unlike the
 * paragraph commands, which was probably okay.  However, they also moved
 * to the start of the last line when there where no more sections instead
 * of the end of the last line like the paragraph commands.  I've changed
 * the latter behavior to match the paragraph commands.
 *
 * In historic vi, a section was defined as the first character(s) of the
 * line matching, which could be followed by anything.  This implementation
 * follows that historic practice.
 *
 * !!!
 * The historic vi documentation (USD:15-10) claimed:
 *    The section commands interpret a preceding count as a different
 *    window size in which to redraw the screen at the new location,
 *    and this window size is the base size for newly drawn windows
 *    until another size is specified.  This is very useful if you are
 *    on a slow terminal ...
 *
 * I can't get the 4BSD vi to do this, it just beeps at me.  For now, a
 * count to the section commands simply repeats the command.
 */

/*
 * v_sectionf -- [count]]]
 *    Move forward count sections/functions.
 *
 * !!!
 * Using ]] as a motion command was a bit special, historically.  It could
 * match } as well as the usual { and section values.  If it matched a { or
 * a section, it did NOT include the matched line.  If it matched a }, it
 * did include the line.  No clue why.
 *
 * PUBLIC: int v_sectionf __P((SCR *, VICMD *));
 */
int
v_sectionf(sp, vp)
      SCR *sp;
      VICMD *vp;
{
      recno_t cnt, lno;
      size_t len;
      char *p, *list, *lp;

      /* Get the macro list. */
      if ((list = O_STR(sp, O_SECTIONS)) == NULL)
            return (1);

      /*
       * !!!
       * If the starting cursor position is at or before any non-blank
       * characters in the line, i.e. the movement is cutting all of the
       * line's text, the buffer is in line mode.  It's a lot easier to
       * check here, because we know that the end is going to be the start
       * or end of a line.
       */
      if (ISMOTION(vp))
            if (vp->m_start.cno == 0)
                  F_SET(vp, VM_LMODE);
            else {
                  vp->m_stop = vp->m_start;
                  vp->m_stop.cno = 0;
                  if (nonblank(sp, vp->m_stop.lno, &vp->m_stop.cno))
                        return (1);
                  if (vp->m_start.cno <= vp->m_stop.cno)
                        F_SET(vp, VM_LMODE);
            }

      cnt = F_ISSET(vp, VC_C1SET) ? vp->count : 1;
      for (lno = vp->m_start.lno; !db_get(sp, ++lno, 0, &p, &len);) {
            if (len == 0)
                  continue;
            if (p[0] == '{' || ISMOTION(vp) && p[0] == '}') {
                  if (!--cnt) {
                        if (p[0] == '{')
                              goto adjust1;
                        goto adjust2;
                  }
                  continue;
            }
            /*
             * !!!
             * Historic documentation (USD:15-11, 4.2) said that formfeed
             * characters (^L) in the first column delimited sections.
             * The historic code mentions formfeed characters, but never
             * implements them.  Seems reasonable, do it.
             */
            if (p[0] == '\014') {
                  if (!--cnt)
                        goto adjust1;
                  continue;
            }
            if (p[0] != '.' || len < 2)
                  continue;
            for (lp = list; *lp != '\0'; lp += 2 * sizeof(*lp))
                  if (lp[0] == p[1] &&
                      (lp[1] == ' ' && len == 2 || lp[1] == p[2]) &&
                      !--cnt) {
                        /*
                         * !!!
                         * If not cutting this line, adjust to the end
                         * of the previous one.  Otherwise, position to
                         * column 0.
                         */
adjust1:                if (ISMOTION(vp))
                              goto ret1;

adjust2:                vp->m_stop.lno = lno;
                        vp->m_stop.cno = 0;
                        goto ret2;
                  }
      }

      /* If moving forward, reached EOF, check to see if we started there. */
      if (vp->m_start.lno == lno - 1) {
            v_eof(sp, NULL);
            return (1);
      }

ret1: if (db_get(sp, --lno, DBG_FATAL, NULL, &len))
            return (1);
      vp->m_stop.lno = lno;
      vp->m_stop.cno = len ? len - 1 : 0;

      /*
       * Non-motion commands go to the end of the range.  Delete and
       * yank stay at the start of the range.  Ignore others.
       */
ret2: if (ISMOTION(vp)) {
            vp->m_final = vp->m_start;
            if (F_ISSET(vp, VM_LMODE))
                  vp->m_final.cno = 0;
      } else
            vp->m_final = vp->m_stop;
      return (0);
}

/*
 * v_sectionb -- [count][[
 *    Move backward count sections/functions.
 *
 * PUBLIC: int v_sectionb __P((SCR *, VICMD *));
 */
int
v_sectionb(sp, vp)
      SCR *sp;
      VICMD *vp;
{
      size_t len;
      recno_t cnt, lno;
      char *p, *list, *lp;

      /* An empty file or starting from line 1 is always illegal. */
      if (vp->m_start.lno <= 1) {
            v_sof(sp, NULL);
            return (1);
      }

      /* Get the macro list. */
      if ((list = O_STR(sp, O_SECTIONS)) == NULL)
            return (1);

      cnt = F_ISSET(vp, VC_C1SET) ? vp->count : 1;
      for (lno = vp->m_start.lno; !db_get(sp, --lno, 0, &p, &len);) {
            if (len == 0)
                  continue;
            if (p[0] == '{') {
                  if (!--cnt)
                        goto adjust1;
                  continue;
            }
            /*
             * !!!
             * Historic documentation (USD:15-11, 4.2) said that formfeed
             * characters (^L) in the first column delimited sections.
             * The historic code mentions formfeed characters, but never
             * implements them.  Seems reasonable, do it.
             */
            if (p[0] == '\014') {
                  if (!--cnt)
                        goto adjust1;
                  continue;
            }
            if (p[0] != '.' || len < 2)
                  continue;
            for (lp = list; *lp != '\0'; lp += 2 * sizeof(*lp))
                  if (lp[0] == p[1] &&
                      (lp[1] == ' ' && len == 2 || lp[1] == p[2]) &&
                      !--cnt) {
adjust1:                vp->m_stop.lno = lno;
                        vp->m_stop.cno = 0;
                        goto ret1;
                  }
      }

      /*
       * If moving backward, reached SOF, which is a movement sink.
       * We already checked for starting there.
       */
      vp->m_stop.lno = 1;
      vp->m_stop.cno = 0;

      /*
       * All commands move to the end of the range.
       *
       * !!!
       * Historic practice is the section cut was in line mode if it started
       * from column 0 and was in the backward direction.  Otherwise, left
       * motion commands adjust the starting point to the character before
       * the current one.  What makes this worse is that if it cut to line
       * mode it also went to the first non-<blank>.
       */
ret1: if (vp->m_start.cno == 0) {
            F_CLR(vp, VM_RCM_MASK);
            F_SET(vp, VM_RCM_SETFNB);

            --vp->m_start.lno;
            F_SET(vp, VM_LMODE);
      } else
            --vp->m_start.cno;

      vp->m_final = vp->m_stop;
      return (0);
}

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