dist/nvi/vi/v_section.c

   1 /*      $NetBSD: v_section.c,v 1.1.1.2 2008/05/18 14:31:44 aymeric Exp $ */
   2
   3 /*-
   4  * Copyright (c) 1992, 1993, 1994
   5  *      The Regents of the University of California.  All rights reserved.
   6  * Copyright (c) 1992, 1993, 1994, 1995, 1996
   7  *      Keith Bostic.  All rights reserved.
   8  *
   9  * See the LICENSE file for redistribution information.
  10  */
  11
  12 #include "config.h"
  13
  14 #ifndef lint
  15 static const char sccsid[] = "Id: v_section.c,v 10.10 2001/06/25 15:19:35 skimo Exp (Berkeley) Date: 2001/06/25 15:19:35";
  16 #endif /* not lint */
  17
  18 #include <sys/types.h>
  19 #include <sys/queue.h>
  20 #include <sys/time.h>
  21
  22 #include <bitstring.h>
  23 #include <limits.h>
  24 #include <stdio.h>
  25 #include <string.h>
  26
  27 #include "../common/common.h"
  28 #include "vi.h"
  29
  30 /*
  31  * !!!
  32  * In historic vi, the section commands ignored empty lines, unlike the
  33  * paragraph commands, which was probably okay.  However, they also moved
  34  * to the start of the last line when there where no more sections instead
  35  * of the end of the last line like the paragraph commands.  I've changed
  36  * the latter behavior to match the paragraph commands.
  37  *
  38  * In historic vi, a section was defined as the first character(s) of the
  39  * line matching, which could be followed by anything.  This implementation
  40  * follows that historic practice.
  41  *
  42  * !!!
  43  * The historic vi documentation (USD:15-10) claimed:
  44  *      The section commands interpret a preceding count as a different
  45  *      window size in which to redraw the screen at the new location,
  46  *      and this window size is the base size for newly drawn windows
  47  *      until another size is specified.  This is very useful if you are
  48  *      on a slow terminal ...
  49  *
  50  * I can't get the 4BSD vi to do this, it just beeps at me.  For now, a
  51  * count to the section commands simply repeats the command.
  52  */
  53
  54 /*
  55  * v_sectionf -- [count]]]
  56  *      Move forward count sections/functions.
  57  *
  58  * !!!
  59  * Using ]] as a motion command was a bit special, historically.  It could
  60  * match } as well as the usual { and section values.  If it matched a { or
  61  * a section, it did NOT include the matched line.  If it matched a }, it
  62  * did include the line.  No clue why.
  63  *
  64  * PUBLIC: int v_sectionf __P((SCR *, VICMD *));
  65  */
  66 int
  67 v_sectionf(SCR *sp, VICMD *vp)
  68 {
  69         db_recno_t cnt, lno;
  70         size_t len;
  71         CHAR_T *p;
  72         const 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
  99         cnt = F_ISSET(vp, VC_C1SET) ? vp->count : 1;
 100         for (lno = vp->m_start.lno; !db_get(sp, ++lno, 0, &p, &len);) {
 101                 if (len == 0)
 102                         continue;
 103                 if (p[0] == '{' || (ISMOTION(vp) && p[0] == '}')) {
 104                         if (!--cnt) {
 105                                 if (p[0] == '{')
 106                                         goto adjust1;
 107                                 goto adjust2;
 108                         }
 109                         continue;
 110                 }
 111                 /*
 112                  * !!!
 113                  * Historic documentation (USD:15-11, 4.2) said that formfeed
 114                  * characters (^L) in the first column delimited sections.
 115                  * The historic code mentions formfeed characters, but never
 116                  * implements them.  Seems reasonable, do it.
 117                  */
 118                 if (p[0] == '\014') {
 119                         if (!--cnt)
 120                                 goto adjust1;
 121                         continue;
 122                 }
 123                 if (p[0] != '.' || len < 2)
 124                         continue;
 125                 for (lp = list; *lp != '\0'; lp += 2 * sizeof(*lp))
 126                         if (lp[0] == p[1] &&
 127                             ((lp[1] == ' ' && len == 2) || lp[1] == p[2]) &&
 128                             !--cnt) {
 129                                 /*
 130                                  * !!!
 131                                  * If not cutting this line, adjust to the end
 132                                  * of the previous one.  Otherwise, position to
 133                                  * column 0.
 134                                  */
 135 adjust1:                        if (ISMOTION(vp))
 136                                         goto ret1;
 137
 138 adjust2:                        vp->m_stop.lno = lno;
 139                                 vp->m_stop.cno = 0;
 140                                 goto ret2;
 141                         }
 142         }
 143
 144         /* If moving forward, reached EOF, check to see if we started there. */
 145         if (vp->m_start.lno == lno - 1) {
 146                 v_eof(sp, NULL);
 147                 return (1);
 148         }
 149
 150 ret1:   if (db_get(sp, --lno, DBG_FATAL, NULL, &len))
 151                 return (1);
 152         vp->m_stop.lno = lno;
 153         vp->m_stop.cno = len ? len - 1 : 0;
 154
 155         /*
 156          * Non-motion commands go to the end of the range.  Delete and
 157          * yank stay at the start of the range.  Ignore others.
 158          */
 159 ret2:   if (ISMOTION(vp)) {
 160                 vp->m_final = vp->m_start;
 161                 if (F_ISSET(vp, VM_LMODE))
 162                         vp->m_final.cno = 0;
 163         } else
 164                 vp->m_final = vp->m_stop;
 165         return (0);
 166 }
 167
 168 /*
 169  * v_sectionb -- [count][[
 170  *      Move backward count sections/functions.
 171  *
 172  * PUBLIC: int v_sectionb __P((SCR *, VICMD *));
 173  */
 174 int
 175 v_sectionb(SCR *sp, VICMD *vp)
 176 {
 177         size_t len;
 178         db_recno_t cnt, lno;
 179         CHAR_T *p;
 180         const char *list, *lp;
 181
 182         /* An empty file or starting from line 1 is always illegal. */
 183         if (vp->m_start.lno <= 1) {
 184                 v_sof(sp, NULL);
 185                 return (1);
 186         }
 187
 188         /* Get the macro list. */
 189         if ((list = O_STR(sp, O_SECTIONS)) == NULL)
 190                 return (1);
 191
 192         cnt = F_ISSET(vp, VC_C1SET) ? vp->count : 1;
 193         for (lno = vp->m_start.lno; !db_get(sp, --lno, 0, &p, &len);) {
 194                 if (len == 0)
 195                         continue;
 196                 if (p[0] == '{') {
 197                         if (!--cnt)
 198                                 goto adjust1;
 199                         continue;
 200                 }
 201                 /*
 202                  * !!!
 203                  * Historic documentation (USD:15-11, 4.2) said that formfeed
 204                  * characters (^L) in the first column delimited sections.
 205                  * The historic code mentions formfeed characters, but never
 206                  * implements them.  Seems reasonable, do it.
 207                  */
 208                 if (p[0] == '\014') {
 209                         if (!--cnt)
 210                                 goto adjust1;
 211                         continue;
 212                 }
 213                 if (p[0] != '.' || len < 2)
 214                         continue;
 215                 for (lp = list; *lp != '\0'; lp += 2 * sizeof(*lp))
 216                         if (lp[0] == p[1] &&
 217                             ((lp[1] == ' ' && len == 2) || lp[1] == p[2]) &&
 218                             !--cnt) {
 219 adjust1:                        vp->m_stop.lno = lno;
 220                                 vp->m_stop.cno = 0;
 221                                 goto ret1;
 222                         }
 223         }
 224
 225         /*
 226          * If moving backward, reached SOF, which is a movement sink.
 227          * We already checked for starting there.
 228          */
 229         vp->m_stop.lno = 1;
 230         vp->m_stop.cno = 0;
 231
 232         /*
 233          * All commands move to the end of the range.
 234          *
 235          * !!!
 236          * Historic practice is the section cut was in line mode if it started
 237          * from column 0 and was in the backward direction.  Otherwise, left
 238          * motion commands adjust the starting point to the character before
 239          * the current one.  What makes this worse is that if it cut to line
 240          * mode it also went to the first non-<blank>.
 241          */
 242 ret1:   if (vp->m_start.cno == 0) {
 243                 F_CLR(vp, VM_RCM_MASK);
 244                 F_SET(vp, VM_RCM_SETFNB);
 245
 246                 --vp->m_start.lno;
 247                 F_SET(vp, VM_LMODE);
 248         } else
 249                 --vp->m_start.cno;
 250
 251         vp->m_final = vp->m_stop;
 252         return (0);
 253 }