usr.bin/vi/nvi/v_paragraph.c

/*-
 * Copyright (c) 1992, 1993
 *      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_paragraph.c       8.4 (Berkeley) 12/9/93";
#endif /* not lint */

#include <sys/types.h>

#include <errno.h>
#include <stdlib.h>
#include <string.h>

#include "vi.h"
#include "vcmd.h"

/*
 * Paragraphs are empty lines after text or values from the paragraph or
 * section options.
 */

/*
 * v_paragraphf -- [count]}
 *      Move forward count paragraphs.
 */
int
v_paragraphf(sp, ep, vp, fm, tm, rp)
        SCR *sp;
        EXF *ep;
        VICMDARG *vp;
        MARK *fm, *tm, *rp;
{
        enum { P_INTEXT, P_INBLANK } pstate;
        size_t lastlen, len;
        recno_t cnt, lastlno, lno;
        char *p, *lp;

        /* Figure out what state we're currently in. */
        lno = fm->lno;
        if ((p = file_gline(sp, ep, lno, &len)) == NULL)
                goto eof;

        /*
         * If we start in text, we want to switch states 2 * N - 1
         * times, in non-text, 2 * N times.
         */
        cnt = F_ISSET(vp, VC_C1SET) ? vp->count : 1;
        cnt *= 2;
        if (len == 0 || v_isempty(p, len))
                pstate = P_INBLANK;
        else {
                --cnt;
                pstate = P_INTEXT;
        }

        for (;;) {
                lastlno = lno;
                lastlen = len;
                if ((p = file_gline(sp, ep, ++lno, &len)) == NULL)
                        goto eof;
                switch (pstate) {
                case P_INTEXT:
                        if (p[0] == '.' && len >= 2)
                                for (lp = VIP(sp)->paragraph; *lp; lp += 2)
                                        if (lp[0] == p[1] &&
                                            (lp[1] == ' ' || lp[1] == p[2]) &&
                                            !--cnt)
                                                goto found;
                        if (len == 0 || v_isempty(p, len)) {
                                if (!--cnt)
                                        goto found;
                                pstate = P_INBLANK;
                        }
                        break;
                case P_INBLANK:
                        if (len == 0 || v_isempty(p, len))
                                break;
                        if (--cnt) {
                                pstate = P_INTEXT;
                                break;
                        }
                        /*
                         * Historically, a motion command was up to the end
                         * of the previous line, whereas the movement command
                         * was to the start of the new "paragraph".
                         */
found:                  if (F_ISSET(vp, VC_C | VC_D | VC_Y)) {
                                rp->lno = lastlno;
                                rp->cno = lastlen ? lastlen + 1 : 0;
                        } else {
                                rp->lno = lno;
                                rp->cno = 0;
                        }
                        return (0);
                default:
                        abort();
                }
        }

        /*
         * EOF is a movement sink, however, the } command historically
         * moved to the end of the last line if repeatedly invoked.
         */
eof:    if (fm->lno != lno - 1) {
                rp->lno = lno - 1;
                rp->cno = len ? len - 1 : 0;
                return (0);
        }
        if ((p = file_gline(sp, ep, fm->lno, &len)) == NULL)
                GETLINE_ERR(sp, fm->lno);
        if (fm->cno != (len ? len - 1 : 0)) {
                rp->lno = lno - 1;
                rp->cno = len ? len - 1 : 0;
                return (0);
        }
        v_eof(sp, ep, NULL);
        return (1);
}

/*
 * v_paragraphb -- [count]{
 *      Move forward count paragraph.
 */
int
v_paragraphb(sp, ep, vp, fm, tm, rp)
        SCR *sp;
        EXF *ep;
        VICMDARG *vp;
        MARK *fm, *tm, *rp;
{
        enum { P_INTEXT, P_INBLANK } pstate;
        size_t len;
        recno_t cnt, lno;
        char *p, *lp;

        /*
         * The { command historically moved to the beginning of the first
         * line if invoked on the first line.
         *
         * Check for SOF.
         */
        if (fm->lno <= 1) {
                if (fm->cno == 0) {
                        v_sof(sp, NULL);
                        return (1);
                }
                rp->lno = 1;
                rp->cno = 0;
                return (0);
        }

        /* Figure out what state we're currently in. */
        lno = fm->lno;
        if ((p = file_gline(sp, ep, lno, &len)) == NULL)
                goto sof;

        /*
         * If we start in text, we want to switch states 2 * N - 1
         * times, in non-text, 2 * N times.
         */
        cnt = F_ISSET(vp, VC_C1SET) ? vp->count : 1;
        cnt *= 2;
        if (len == 0 || v_isempty(p, len))
                pstate = P_INBLANK;
        else {
                --cnt;
                pstate = P_INTEXT;
        }

        for (;;) {
                if ((p = file_gline(sp, ep, --lno, &len)) == NULL)
                        goto sof;
                switch (pstate) {
                case P_INTEXT:
                        if (p[0] == '.' && len >= 2)
                                for (lp = VIP(sp)->paragraph; *lp; lp += 2)
                                        if (lp[0] == p[1] &&
                                            (lp[1] == ' ' || lp[1] == p[2]) &&
                                            !--cnt)
                                                goto found;
                        if (len == 0 || v_isempty(p, len)) {
                                if (!--cnt)
                                        goto found;
                                pstate = P_INBLANK;
                        }
                        break;
                case P_INBLANK:
                        if (len != 0 && !v_isempty(p, len)) {
                                if (!--cnt) {
found:                                  rp->lno = lno;
                                        rp->cno = 0;
                                        return (0);
                                }
                                pstate = P_INTEXT;
                        }
                        break;
                default:
                        abort();
                }
        }

        /* SOF is a movement sink. */
sof:    rp->lno = 1;
        rp->cno = 0;
        return (0);
}

/*
 * v_buildparagraph --
 *      Build the paragraph command search pattern.
 */
int
v_buildparagraph(sp)
        SCR *sp;
{
        VI_PRIVATE *vip;
        size_t p_len, s_len;
        char *p, *p_p, *s_p;

        /*
         * The vi paragraph command searches for either a paragraph or
         * section option macro.
         */
        p_len = (p_p = O_STR(sp, O_PARAGRAPHS)) == NULL ? 0 : strlen(p_p);
        s_len = (s_p = O_STR(sp, O_SECTIONS)) == NULL ? 0 : strlen(s_p);

        if (p_len == 0 && s_len == 0)
                return (0);

        MALLOC_RET(sp, p, char *, p_len + s_len + 1);

        vip = VIP(sp);
        if (vip->paragraph != NULL)
                FREE(vip->paragraph, vip->paragraph_len);

        if (p_p != NULL)
                memmove(p, p_p, p_len + 1);
        if (s_p != NULL)
                memmove(p + p_len, s_p, s_len + 1);
        vip->paragraph = p;
        vip->paragraph_len = p_len + s_len + 1;
        return (0);
}