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[] = "$Id: v_section.c,v 10.9 2000/06/27 17:19:08 skimo Exp $ (Berkeley) $Date: 2000/06/27 17:19:08 $";
  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         db_recno_t cnt, lno;
  70         size_t len;
  71         CHAR_T *p;
  72         char *list, *lp;
  73
  74         /* Get the macro list. */
  75         if ((list = O_STR(sp, O_SECTIONS)) == NULL)
  76                 return (1);
  77
  78         /*
  79          * !!!
  80          * If the starting cursor position is at or before any non-blank
  81          * characters in the line, i.e. the movement is cutting all of the
  82          * line's text, the buffer is in line mode.  It's a lot easier to
  83          * check here, because we know that the end is going to be the start
  84          * or end of a line.
  85          */
  86         if (ISMOTION(vp))
  87                 if (vp->m_start.cno == 0)
  88                         F_SET(vp, VM_LMODE);
  89                 else {
  90                         vp->m_stop = vp->m_start;
  91                         vp->m_stop.cno = 0;
  92                         if (nonblank(sp, vp->m_stop.lno, &vp->m_stop.cno))
  93                                 return (1);
  94                         if (vp->m_start.cno <= vp->m_stop.cno)
  95                                 F_SET(vp, VM_LMODE);
  96                 }
  97
  98         cnt = F_ISSET(vp, VC_C1SET) ? vp->count : 1;
  99         for (lno = vp->m_start.lno; !db_get(sp, ++lno, 0, &p, &len);) {
 100                 if (len == 0)
 101                         continue;
 102                 if (p[0] == '{' || ISMOTION(vp) && p[0] == '}') {
 103                         if (!--cnt) {
 104                                 if (p[0] == '{')
 105                                         goto adjust1;
 106                                 goto adjust2;
 107                         }
 108                         continue;
 109                 }
 110                 /*
 111                  * !!!
 112                  * Historic documentation (USD:15-11, 4.2) said that formfeed
 113                  * characters (^L) in the first column delimited sections.
 114                  * The historic code mentions formfeed characters, but never
 115                  * implements them.  Seems reasonable, do it.
 116                  */
 117                 if (p[0] == '\014') {
 118                         if (!--cnt)
 119                                 goto adjust1;
 120                         continue;
 121                 }
 122                 if (p[0] != '.' || len < 2)
 123                         continue;
 124                 for (lp = list; *lp != '\0'; lp += 2 * sizeof(*lp))
 125                         if (lp[0] == p[1] &&
 126                             (lp[1] == ' ' && len == 2 || lp[1] == p[2]) &&
 127                             !--cnt) {
 128                                 /*
 129                                  * !!!
 130                                  * If not cutting this line, adjust to the end
 131                                  * of the previous one.  Otherwise, position to
 132                                  * column 0.
 133                                  */
 134 adjust1:                        if (ISMOTION(vp))
 135                                         goto ret1;
 136
 137 adjust2:                        vp->m_stop.lno = lno;
 138                                 vp->m_stop.cno = 0;
 139                                 goto ret2;
 140                         }
 141         }
 142
 143         /* If moving forward, reached EOF, check to see if we started there. */
 144         if (vp->m_start.lno == lno - 1) {
 145                 v_eof(sp, NULL);
 146                 return (1);
 147         }
 148
 149 ret1:   if (db_get(sp, --lno, DBG_FATAL, NULL, &len))
 150                 return (1);
 151         vp->m_stop.lno = lno;
 152         vp->m_stop.cno = len ? len - 1 : 0;
 153
 154         /*
 155          * Non-motion commands go to the end of the range.  Delete and
 156          * yank stay at the start of the range.  Ignore others.
 157          */
 158 ret2:   if (ISMOTION(vp)) {
 159                 vp->m_final = vp->m_start;
 160                 if (F_ISSET(vp, VM_LMODE))
 161                         vp->m_final.cno = 0;
 162         } else
 163                 vp->m_final = vp->m_stop;
 164         return (0);
 165 }
 166
 167 /*
 168  * v_sectionb -- [count][[
 169  *      Move backward count sections/functions.
 170  *
 171  * PUBLIC: int v_sectionb __P((SCR *, VICMD *));
 172  */
 173 int
 174 v_sectionb(sp, vp)
 175         SCR *sp;
 176         VICMD *vp;
 177 {
 178         size_t len;
 179         db_recno_t cnt, lno;
 180         CHAR_T *p;
 181         char *list, *lp;
 182
 183         /* An empty file or starting from line 1 is always illegal. */
 184         if (vp->m_start.lno <= 1) {
 185                 v_sof(sp, NULL);
 186                 return (1);
 187         }
 188
 189         /* Get the macro list. */
 190         if ((list = O_STR(sp, O_SECTIONS)) == NULL)
 191                 return (1);
 192
 193         cnt = F_ISSET(vp, VC_C1SET) ? vp->count : 1;
 194         for (lno = vp->m_start.lno; !db_get(sp, --lno, 0, &p, &len);) {
 195                 if (len == 0)
 196                         continue;
 197                 if (p[0] == '{') {
 198                         if (!--cnt)
 199                                 goto adjust1;
 200                         continue;
 201                 }
 202                 /*
 203                  * !!!
 204                  * Historic documentation (USD:15-11, 4.2) said that formfeed
 205                  * characters (^L) in the first column delimited sections.
 206                  * The historic code mentions formfeed characters, but never
 207                  * implements them.  Seems reasonable, do it.
 208                  */
 209                 if (p[0] == '\014') {
 210                         if (!--cnt)
 211                                 goto adjust1;
 212                         continue;
 213                 }
 214                 if (p[0] != '.' || len < 2)
 215                         continue;
 216                 for (lp = list; *lp != '\0'; lp += 2 * sizeof(*lp))
 217                         if (lp[0] == p[1] &&
 218                             (lp[1] == ' ' && len == 2 || lp[1] == p[2]) &&
 219                             !--cnt) {
 220 adjust1:                        vp->m_stop.lno = lno;
 221                                 vp->m_stop.cno = 0;
 222                                 goto ret1;
 223                         }
 224         }
 225
 226         /*
 227          * If moving backward, reached SOF, which is a movement sink.
 228          * We already checked for starting there.
 229          */
 230         vp->m_stop.lno = 1;
 231         vp->m_stop.cno = 0;
 232
 233         /*
 234          * All commands move to the end of the range.
 235          *
 236          * !!!
 237          * Historic practice is the section cut was in line mode if it started
 238          * from column 0 and was in the backward direction.  Otherwise, left
 239          * motion commands adjust the starting point to the character before
 240          * the current one.  What makes this worse is that if it cut to line
 241          * mode it also went to the first non-<blank>.
 242          */
 243 ret1:   if (vp->m_start.cno == 0) {
 244                 F_CLR(vp, VM_RCM_MASK);
 245                 F_SET(vp, VM_RCM_SETFNB);
 246
 247                 --vp->m_start.lno;
 248                 F_SET(vp, VM_LMODE);
 249         } else
 250                 --vp->m_start.cno;
 251
 252         vp->m_final = vp->m_stop;
 253         return (0);
 254 }