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 } 253