contrib/nvi/vi/v_section.c

   1 /*-
   2  * Copyright (c) 1992, 1993, 1994
   3  *      The Regents of the University of California.  All rights reserved.
   4  * Copyright (c) 1992, 1993, 1994, 1995, 1996
   5  *      Keith Bostic.  All rights reserved.
   6  *
   7  * See the LICENSE file for redistribution information.
   8  */
   9
  10 #include "config.h"
  11
  12 #ifndef lint
  13 static const char sccsid[] = "@(#)v_section.c   10.7 (Berkeley) 3/6/96";
  14 #endif /* not lint */
  15
  16 #include <sys/types.h>
  17 #include <sys/queue.h>
  18 #include <sys/time.h>
  19
  20 #include <bitstring.h>
  21 #include <limits.h>
  22 #include <stdio.h>
  23 #include <string.h>
  24
  25 #include "../common/common.h"
  26 #include "vi.h"
  27
  28 /*
  29  * !!!
  30  * In historic vi, the section commands ignored empty lines, unlike the
  31  * paragraph commands, which was probably okay.  However, they also moved
  32  * to the start of the last line when there where no more sections instead
  33  * of the end of the last line like the paragraph commands.  I've changed
  34  * the latter behavior to match the paragraph commands.
  35  *
  36  * In historic vi, a section was defined as the first character(s) of the
  37  * line matching, which could be followed by anything.  This implementation
  38  * follows that historic practice.
  39  *
  40  * !!!
  41  * The historic vi documentation (USD:15-10) claimed:
  42  *      The section commands interpret a preceding count as a different
  43  *      window size in which to redraw the screen at the new location,
  44  *      and this window size is the base size for newly drawn windows
  45  *      until another size is specified.  This is very useful if you are
  46  *      on a slow terminal ...
  47  *
  48  * I can't get the 4BSD vi to do this, it just beeps at me.  For now, a
  49  * count to the section commands simply repeats the command.
  50  */
  51
  52 /*
  53  * v_sectionf -- [count]]]
  54  *      Move forward count sections/functions.
  55  *
  56  * !!!
  57  * Using ]] as a motion command was a bit special, historically.  It could
  58  * match } as well as the usual { and section values.  If it matched a { or
  59  * a section, it did NOT include the matched line.  If it matched a }, it
  60  * did include the line.  No clue why.
  61  *
  62  * PUBLIC: int v_sectionf __P((SCR *, VICMD *));
  63  */
  64 int
  65 v_sectionf(sp, vp)
  66         SCR *sp;
  67         VICMD *vp;
  68 {
  69         recno_t cnt, lno;
  70         size_t len;
  71         char *p, *list, *lp;
  72
  73         /* Get the macro list. */
  74         if ((list = O_STR(sp, O_SECTIONS)) == NULL)
  75                 return (1);
  76
  77         /*
  78          * !!!
  79          * If the starting cursor position is at or before any non-blank
  80          * characters in the line, i.e. the movement is cutting all of the
  81          * line's text, the buffer is in line mode.  It's a lot easier to
  82          * check here, because we know that the end is going to be the start
  83          * or end of a line.
  84          */
  85         if (ISMOTION(vp))
  86                 if (vp->m_start.cno == 0)
  87                         F_SET(vp, VM_LMODE);
  88                 else {
  89                         vp->m_stop = vp->m_start;
  90                         vp->m_stop.cno = 0;
  91                         if (nonblank(sp, vp->m_stop.lno, &vp->m_stop.cno))
  92                                 return (1);
  93                         if (vp->m_start.cno <= vp->m_stop.cno)
  94                                 F_SET(vp, VM_LMODE);
  95                 }
  96
  97         cnt = F_ISSET(vp, VC_C1SET) ? vp->count : 1;
  98         for (lno = vp->m_start.lno; !db_get(sp, ++lno, 0, &p, &len);) {
  99                 if (len == 0)
 100                         continue;
 101                 if (p[0] == '{' || ISMOTION(vp) && p[0] == '}') {
 102                         if (!--cnt) {
 103                                 if (p[0] == '{')
 104                                         goto adjust1;
 105                                 goto adjust2;
 106                         }
 107                         continue;
 108                 }
 109                 /*
 110                  * !!!
 111                  * Historic documentation (USD:15-11, 4.2) said that formfeed
 112                  * characters (^L) in the first column delimited sections.
 113                  * The historic code mentions formfeed characters, but never
 114                  * implements them.  Seems reasonable, do it.
 115                  */
 116                 if (p[0] == '\014') {
 117                         if (!--cnt)
 118                                 goto adjust1;
 119                         continue;
 120                 }
 121                 if (p[0] != '.' || len < 2)
 122                         continue;
 123                 for (lp = list; *lp != '\0'; lp += 2 * sizeof(*lp))
 124                         if (lp[0] == p[1] &&
 125                             (lp[1] == ' ' && len == 2 || lp[1] == p[2]) &&
 126                             !--cnt) {
 127                                 /*
 128                                  * !!!
 129                                  * If not cutting this line, adjust to the end
 130                                  * of the previous one.  Otherwise, position to
 131                                  * column 0.
 132                                  */
 133 adjust1:                        if (ISMOTION(vp))
 134                                         goto ret1;
 135
 136 adjust2:                        vp->m_stop.lno = lno;
 137                                 vp->m_stop.cno = 0;
 138                                 goto ret2;
 139                         }
 140         }
 141
 142         /* If moving forward, reached EOF, check to see if we started there. */
 143         if (vp->m_start.lno == lno - 1) {
 144                 v_eof(sp, NULL);
 145                 return (1);
 146         }
 147
 148 ret1:   if (db_get(sp, --lno, DBG_FATAL, NULL, &len))
 149                 return (1);
 150         vp->m_stop.lno = lno;
 151         vp->m_stop.cno = len ? len - 1 : 0;
 152
 153         /*
 154          * Non-motion commands go to the end of the range.  Delete and
 155          * yank stay at the start of the range.  Ignore others.
 156          */
 157 ret2:   if (ISMOTION(vp)) {
 158                 vp->m_final = vp->m_start;
 159                 if (F_ISSET(vp, VM_LMODE))
 160                         vp->m_final.cno = 0;
 161         } else
 162                 vp->m_final = vp->m_stop;
 163         return (0);
 164 }
 165
 166 /*
 167  * v_sectionb -- [count][[
 168  *      Move backward count sections/functions.
 169  *
 170  * PUBLIC: int v_sectionb __P((SCR *, VICMD *));
 171  */
 172 int
 173 v_sectionb(sp, vp)
 174         SCR *sp;
 175         VICMD *vp;
 176 {
 177         size_t len;
 178         recno_t cnt, lno;
 179         char *p, *list, *lp;
 180
 181         /* An empty file or starting from line 1 is always illegal. */
 182         if (vp->m_start.lno <= 1) {
 183                 v_sof(sp, NULL);
 184                 return (1);
 185         }
 186
 187         /* Get the macro list. */
 188         if ((list = O_STR(sp, O_SECTIONS)) == NULL)
 189                 return (1);
 190
 191         cnt = F_ISSET(vp, VC_C1SET) ? vp->count : 1;
 192         for (lno = vp->m_start.lno; !db_get(sp, --lno, 0, &p, &len);) {
 193                 if (len == 0)
 194                         continue;
 195                 if (p[0] == '{') {
 196                         if (!--cnt)
 197                                 goto adjust1;
 198                         continue;
 199                 }
 200                 /*
 201                  * !!!
 202                  * Historic documentation (USD:15-11, 4.2) said that formfeed
 203                  * characters (^L) in the first column delimited sections.
 204                  * The historic code mentions formfeed characters, but never
 205                  * implements them.  Seems reasonable, do it.
 206                  */
 207                 if (p[0] == '\014') {
 208                         if (!--cnt)
 209                                 goto adjust1;
 210                         continue;
 211                 }
 212                 if (p[0] != '.' || len < 2)
 213                         continue;
 214                 for (lp = list; *lp != '\0'; lp += 2 * sizeof(*lp))
 215                         if (lp[0] == p[1] &&
 216                             (lp[1] == ' ' && len == 2 || lp[1] == p[2]) &&
 217                             !--cnt) {
 218 adjust1:                        vp->m_stop.lno = lno;
 219                                 vp->m_stop.cno = 0;
 220                                 goto ret1;
 221                         }
 222         }
 223
 224         /*
 225          * If moving backward, reached SOF, which is a movement sink.
 226          * We already checked for starting there.
 227          */
 228         vp->m_stop.lno = 1;
 229         vp->m_stop.cno = 0;
 230
 231         /*
 232          * All commands move to the end of the range.
 233          *
 234          * !!!
 235          * Historic practice is the section cut was in line mode if it started
 236          * from column 0 and was in the backward direction.  Otherwise, left
 237          * motion commands adjust the starting point to the character before
 238          * the current one.  What makes this worse is that if it cut to line
 239          * mode it also went to the first non-<blank>.
 240          */
 241 ret1:   if (vp->m_start.cno == 0) {
 242                 F_CLR(vp, VM_RCM_MASK);
 243                 F_SET(vp, VM_RCM_SETFNB);
 244
 245                 --vp->m_start.lno;
 246                 F_SET(vp, VM_LMODE);
 247         } else
 248                 --vp->m_start.cno;
 249
 250         vp->m_final = vp->m_stop;
 251         return (0);
 252 }