contrib/nvi2/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 10.10 2001/06/25 15:19:35 skimo Exp $";
  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(SCR *, VICMD *);
  63  */
  64 int
  65 v_sectionf(SCR *sp, VICMD *vp)
  66 {
  67         recno_t cnt, lno;
  68         size_t len;
  69         CHAR_T *p;
  70         char *list, *lp;
  71
  72         /* Get the macro list. */
  73         if ((list = O_STR(sp, O_SECTIONS)) == NULL)
  74                 return (1);
  75
  76         /*
  77          * !!!
  78          * If the starting cursor position is at or before any non-blank
  79          * characters in the line, i.e. the movement is cutting all of the
  80          * line's text, the buffer is in line mode.  It's a lot easier to
  81          * check here, because we know that the end is going to be the start
  82          * or end of a line.
  83          */
  84         if (ISMOTION(vp))
  85                 if (vp->m_start.cno == 0)
  86                         F_SET(vp, VM_LMODE);
  87                 else {
  88                         vp->m_stop = vp->m_start;
  89                         vp->m_stop.cno = 0;
  90                         if (nonblank(sp, vp->m_stop.lno, &vp->m_stop.cno))
  91                                 return (1);
  92                         if (vp->m_start.cno <= vp->m_stop.cno)
  93                                 F_SET(vp, VM_LMODE);
  94                 }
  95
  96         cnt = F_ISSET(vp, VC_C1SET) ? vp->count : 1;
  97         for (lno = vp->m_start.lno; !db_get(sp, ++lno, 0, &p, &len);) {
  98                 if (len == 0)
  99                         continue;
 100                 if (p[0] == '{' || (ISMOTION(vp) && p[0] == '}')) {
 101                         if (!--cnt) {
 102                                 if (p[0] == '{')
 103                                         goto adjust1;
 104                                 goto adjust2;
 105                         }
 106                         continue;
 107                 }
 108                 /*
 109                  * !!!
 110                  * Historic documentation (USD:15-11, 4.2) said that formfeed
 111                  * characters (^L) in the first column delimited sections.
 112                  * The historic code mentions formfeed characters, but never
 113                  * implements them.  Seems reasonable, do it.
 114                  */
 115                 if (p[0] == '\014') {
 116                         if (!--cnt)
 117                                 goto adjust1;
 118                         continue;
 119                 }
 120                 if (p[0] != '.' || len < 2)
 121                         continue;
 122                 for (lp = list; *lp != '\0'; lp += 2 * sizeof(*lp))
 123                         if (lp[0] == p[1] &&
 124                             ((lp[1] == ' ' && len == 2) || lp[1] == p[2]) &&
 125                             !--cnt) {
 126                                 /*
 127                                  * !!!
 128                                  * If not cutting this line, adjust to the end
 129                                  * of the previous one.  Otherwise, position to
 130                                  * column 0.
 131                                  */
 132 adjust1:                        if (ISMOTION(vp))
 133                                         goto ret1;
 134
 135 adjust2:                        vp->m_stop.lno = lno;
 136                                 vp->m_stop.cno = 0;
 137                                 goto ret2;
 138                         }
 139         }
 140
 141         /* If moving forward, reached EOF, check to see if we started there. */
 142         if (vp->m_start.lno == lno - 1) {
 143                 v_eof(sp, NULL);
 144                 return (1);
 145         }
 146
 147 ret1:   if (db_get(sp, --lno, DBG_FATAL, NULL, &len))
 148                 return (1);
 149         vp->m_stop.lno = lno;
 150         vp->m_stop.cno = len ? len - 1 : 0;
 151
 152         /*
 153          * Non-motion commands go to the end of the range.  Delete and
 154          * yank stay at the start of the range.  Ignore others.
 155          */
 156 ret2:   if (ISMOTION(vp)) {
 157                 vp->m_final = vp->m_start;
 158                 if (F_ISSET(vp, VM_LMODE))
 159                         vp->m_final.cno = 0;
 160         } else
 161                 vp->m_final = vp->m_stop;
 162         return (0);
 163 }
 164
 165 /*
 166  * v_sectionb -- [count][[
 167  *      Move backward count sections/functions.
 168  *
 169  * PUBLIC: int v_sectionb(SCR *, VICMD *);
 170  */
 171 int
 172 v_sectionb(SCR *sp, VICMD *vp)
 173 {
 174         size_t len;
 175         recno_t cnt, lno;
 176         CHAR_T *p;
 177         char *list, *lp;
 178
 179         /* An empty file or starting from line 1 is always illegal. */
 180         if (vp->m_start.lno <= 1) {
 181                 v_sof(sp, NULL);
 182                 return (1);
 183         }
 184
 185         /* Get the macro list. */
 186         if ((list = O_STR(sp, O_SECTIONS)) == NULL)
 187                 return (1);
 188
 189         cnt = F_ISSET(vp, VC_C1SET) ? vp->count : 1;
 190         for (lno = vp->m_start.lno; !db_get(sp, --lno, 0, &p, &len);) {
 191                 if (len == 0)
 192                         continue;
 193                 if (p[0] == '{') {
 194                         if (!--cnt)
 195                                 goto adjust1;
 196                         continue;
 197                 }
 198                 /*
 199                  * !!!
 200                  * Historic documentation (USD:15-11, 4.2) said that formfeed
 201                  * characters (^L) in the first column delimited sections.
 202                  * The historic code mentions formfeed characters, but never
 203                  * implements them.  Seems reasonable, do it.
 204                  */
 205                 if (p[0] == '\014') {
 206                         if (!--cnt)
 207                                 goto adjust1;
 208                         continue;
 209                 }
 210                 if (p[0] != '.' || len < 2)
 211                         continue;
 212                 for (lp = list; *lp != '\0'; lp += 2 * sizeof(*lp))
 213                         if (lp[0] == p[1] &&
 214                             ((lp[1] == ' ' && len == 2) || lp[1] == p[2]) &&
 215                             !--cnt) {
 216 adjust1:                        vp->m_stop.lno = lno;
 217                                 vp->m_stop.cno = 0;
 218                                 goto ret1;
 219                         }
 220         }
 221
 222         /*
 223          * If moving backward, reached SOF, which is a movement sink.
 224          * We already checked for starting there.
 225          */
 226         vp->m_stop.lno = 1;
 227         vp->m_stop.cno = 0;
 228
 229         /*
 230          * All commands move to the end of the range.
 231          *
 232          * !!!
 233          * Historic practice is the section cut was in line mode if it started
 234          * from column 0 and was in the backward direction.  Otherwise, left
 235          * motion commands adjust the starting point to the character before
 236          * the current one.  What makes this worse is that if it cut to line
 237          * mode it also went to the first non-<blank>.
 238          */
 239 ret1:   if (vp->m_start.cno == 0) {
 240                 F_CLR(vp, VM_RCM_MASK);
 241                 F_SET(vp, VM_RCM_SETFNB);
 242
 243                 --vp->m_start.lno;
 244                 F_SET(vp, VM_LMODE);
 245         } else
 246                 --vp->m_start.cno;
 247
 248         vp->m_final = vp->m_stop;
 249         return (0);
 250 }