[14301] | 1 | /*- |
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| 2 | * Copyright (c) 1992, 1993, 1994 |
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| 3 | * The Regents of the University of California. All rights reserved. |
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| 4 | * Copyright (c) 1992, 1993, 1994, 1995, 1996 |
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| 5 | * Keith Bostic. All rights reserved. |
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| 6 | * |
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| 7 | * See the LICENSE file for redistribution information. |
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| 8 | */ |
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| 9 | |
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| 10 | #include "config.h" |
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| 11 | |
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| 12 | #ifndef lint |
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| 13 | static const char sccsid[] = "@(#)v_paragraph.c 10.7 (Berkeley) 3/6/96"; |
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| 14 | #endif /* not lint */ |
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| 15 | |
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| 16 | #include <sys/types.h> |
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| 17 | #include <sys/queue.h> |
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| 18 | #include <sys/time.h> |
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| 19 | |
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| 20 | #include <bitstring.h> |
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| 21 | #include <errno.h> |
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| 22 | #include <limits.h> |
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| 23 | #include <stdio.h> |
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| 24 | #include <stdlib.h> |
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| 25 | #include <string.h> |
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| 26 | |
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| 27 | #include "../common/common.h" |
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| 28 | #include "vi.h" |
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| 29 | |
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| 30 | #define INTEXT_CHECK { \ |
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| 31 | if (len == 0 || v_isempty(p, len)) { \ |
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| 32 | if (!--cnt) \ |
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| 33 | goto found; \ |
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| 34 | pstate = P_INBLANK; \ |
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| 35 | } \ |
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| 36 | /* \ |
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| 37 | * !!! \ |
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| 38 | * Historic documentation (USD:15-11, 4.2) said that formfeed \ |
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| 39 | * characters (^L) in the first column delimited paragraphs. \ |
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| 40 | * The historic vi code mentions formfeed characters, but never \ |
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| 41 | * implements them. It seems reasonable, do it. \ |
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| 42 | */ \ |
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| 43 | if (p[0] == '\014') { \ |
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| 44 | if (!--cnt) \ |
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| 45 | goto found; \ |
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| 46 | continue; \ |
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| 47 | } \ |
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| 48 | if (p[0] != '.' || len < 2) \ |
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| 49 | continue; \ |
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| 50 | for (lp = VIP(sp)->ps; *lp != '\0'; lp += 2) \ |
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| 51 | if (lp[0] == p[1] && \ |
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| 52 | (lp[1] == ' ' && len == 2 || lp[1] == p[2]) && \ |
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| 53 | !--cnt) \ |
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| 54 | goto found; \ |
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| 55 | } |
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| 56 | |
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| 57 | /* |
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| 58 | * v_paragraphf -- [count]} |
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| 59 | * Move forward count paragraphs. |
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| 60 | * |
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| 61 | * Paragraphs are empty lines after text, formfeed characters, or values |
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| 62 | * from the paragraph or section options. |
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| 63 | * |
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| 64 | * PUBLIC: int v_paragraphf __P((SCR *, VICMD *)); |
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| 65 | */ |
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| 66 | int |
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| 67 | v_paragraphf(sp, vp) |
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| 68 | SCR *sp; |
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| 69 | VICMD *vp; |
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| 70 | { |
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| 71 | enum { P_INTEXT, P_INBLANK } pstate; |
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| 72 | size_t lastlen, len; |
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| 73 | recno_t cnt, lastlno, lno; |
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| 74 | int isempty; |
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| 75 | char *p, *lp; |
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| 76 | |
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| 77 | /* |
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| 78 | * !!! |
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| 79 | * If the starting cursor position is at or before any non-blank |
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| 80 | * characters in the line, i.e. the movement is cutting all of the |
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| 81 | * line's text, the buffer is in line mode. It's a lot easier to |
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| 82 | * check here, because we know that the end is going to be the start |
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| 83 | * or end of a line. |
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| 84 | * |
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| 85 | * This was historical practice in vi, with a single exception. If |
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| 86 | * the paragraph movement was from the start of the last line to EOF, |
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| 87 | * then all the characters were deleted from the last line, but the |
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| 88 | * line itself remained. If somebody complains, don't pause, don't |
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| 89 | * hesitate, just hit them. |
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| 90 | */ |
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| 91 | if (ISMOTION(vp)) |
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| 92 | if (vp->m_start.cno == 0) |
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| 93 | F_SET(vp, VM_LMODE); |
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| 94 | else { |
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| 95 | vp->m_stop = vp->m_start; |
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| 96 | vp->m_stop.cno = 0; |
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| 97 | if (nonblank(sp, vp->m_stop.lno, &vp->m_stop.cno)) |
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| 98 | return (1); |
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| 99 | if (vp->m_start.cno <= vp->m_stop.cno) |
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| 100 | F_SET(vp, VM_LMODE); |
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| 101 | } |
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| 102 | |
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| 103 | /* Figure out what state we're currently in. */ |
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| 104 | lno = vp->m_start.lno; |
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| 105 | if (db_get(sp, lno, 0, &p, &len)) |
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| 106 | goto eof; |
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| 107 | |
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| 108 | /* |
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| 109 | * If we start in text, we want to switch states |
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| 110 | * (2 * N - 1) times, in non-text, (2 * N) times. |
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| 111 | */ |
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| 112 | cnt = F_ISSET(vp, VC_C1SET) ? vp->count : 1; |
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| 113 | cnt *= 2; |
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| 114 | if (len == 0 || v_isempty(p, len)) |
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| 115 | pstate = P_INBLANK; |
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| 116 | else { |
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| 117 | --cnt; |
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| 118 | pstate = P_INTEXT; |
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| 119 | } |
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| 120 | |
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| 121 | for (;;) { |
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| 122 | lastlno = lno; |
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| 123 | lastlen = len; |
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| 124 | if (db_get(sp, ++lno, 0, &p, &len)) |
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| 125 | goto eof; |
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| 126 | switch (pstate) { |
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| 127 | case P_INTEXT: |
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| 128 | INTEXT_CHECK; |
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| 129 | break; |
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| 130 | case P_INBLANK: |
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| 131 | if (len == 0 || v_isempty(p, len)) |
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| 132 | break; |
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| 133 | if (--cnt) { |
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| 134 | pstate = P_INTEXT; |
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| 135 | break; |
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| 136 | } |
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| 137 | /* |
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| 138 | * !!! |
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| 139 | * Non-motion commands move to the end of the range, |
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| 140 | * delete and yank stay at the start. Ignore others. |
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| 141 | * Adjust the end of the range for motion commands; |
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| 142 | * historically, a motion component was to the end of |
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| 143 | * the previous line, whereas the movement command was |
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| 144 | * to the start of the new "paragraph". |
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| 145 | */ |
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| 146 | found: if (ISMOTION(vp)) { |
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| 147 | vp->m_stop.lno = lastlno; |
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| 148 | vp->m_stop.cno = lastlen ? lastlen - 1 : 0; |
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| 149 | vp->m_final = vp->m_start; |
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| 150 | } else { |
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| 151 | vp->m_stop.lno = lno; |
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| 152 | vp->m_stop.cno = 0; |
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| 153 | vp->m_final = vp->m_stop; |
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| 154 | } |
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| 155 | return (0); |
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| 156 | default: |
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| 157 | abort(); |
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| 158 | } |
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| 159 | } |
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| 160 | |
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| 161 | /* |
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| 162 | * !!! |
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| 163 | * Adjust end of the range for motion commands; EOF is a movement |
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| 164 | * sink. The } command historically moved to the end of the last |
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| 165 | * line, not the beginning, from any position before the end of the |
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| 166 | * last line. It also historically worked on empty files, so we |
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| 167 | * have to make it okay. |
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| 168 | */ |
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| 169 | eof: if (vp->m_start.lno == lno || vp->m_start.lno == lno - 1) { |
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| 170 | if (db_eget(sp, vp->m_start.lno, &p, &len, &isempty)) { |
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| 171 | if (!isempty) |
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| 172 | return (1); |
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| 173 | vp->m_start.cno = 0; |
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| 174 | return (0); |
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| 175 | } |
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| 176 | if (vp->m_start.cno == (len ? len - 1 : 0)) { |
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| 177 | v_eof(sp, NULL); |
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| 178 | return (1); |
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| 179 | } |
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| 180 | } |
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| 181 | /* |
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| 182 | * !!! |
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| 183 | * Non-motion commands move to the end of the range, delete |
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| 184 | * and yank stay at the start. Ignore others. |
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| 185 | * |
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| 186 | * If deleting the line (which happens if deleting to EOF), then |
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| 187 | * cursor movement is to the first nonblank. |
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| 188 | */ |
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| 189 | if (ISMOTION(vp) && ISCMD(vp->rkp, 'd')) { |
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| 190 | F_CLR(vp, VM_RCM_MASK); |
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| 191 | F_SET(vp, VM_RCM_SETFNB); |
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| 192 | } |
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| 193 | vp->m_stop.lno = lno - 1; |
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| 194 | vp->m_stop.cno = len ? len - 1 : 0; |
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| 195 | vp->m_final = ISMOTION(vp) ? vp->m_start : vp->m_stop; |
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| 196 | return (0); |
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| 197 | } |
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| 198 | |
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| 199 | /* |
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| 200 | * v_paragraphb -- [count]{ |
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| 201 | * Move backward count paragraphs. |
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| 202 | * |
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| 203 | * PUBLIC: int v_paragraphb __P((SCR *, VICMD *)); |
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| 204 | */ |
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| 205 | int |
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| 206 | v_paragraphb(sp, vp) |
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| 207 | SCR *sp; |
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| 208 | VICMD *vp; |
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| 209 | { |
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| 210 | enum { P_INTEXT, P_INBLANK } pstate; |
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| 211 | size_t len; |
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| 212 | recno_t cnt, lno; |
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| 213 | char *p, *lp; |
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| 214 | |
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| 215 | /* |
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| 216 | * !!! |
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| 217 | * Check for SOF. The historic vi didn't complain if users hit SOF |
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| 218 | * repeatedly, unless it was part of a motion command. There is no |
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| 219 | * question but that Emerson's editor of choice was vi. |
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| 220 | * |
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| 221 | * The { command historically moved to the beginning of the first |
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| 222 | * line if invoked on the first line. |
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| 223 | * |
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| 224 | * !!! |
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| 225 | * If the starting cursor position is in the first column (backward |
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| 226 | * paragraph movements did NOT historically pay attention to non-blank |
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| 227 | * characters) i.e. the movement is cutting the entire line, the buffer |
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| 228 | * is in line mode. Cuts from the beginning of the line also did not |
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| 229 | * cut the current line, but started at the previous EOL. |
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| 230 | * |
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| 231 | * Correct for a left motion component while we're thinking about it. |
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| 232 | */ |
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| 233 | lno = vp->m_start.lno; |
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| 234 | |
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| 235 | if (ISMOTION(vp)) |
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| 236 | if (vp->m_start.cno == 0) { |
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| 237 | if (vp->m_start.lno == 1) { |
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| 238 | v_sof(sp, &vp->m_start); |
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| 239 | return (1); |
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| 240 | } else |
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| 241 | --vp->m_start.lno; |
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| 242 | F_SET(vp, VM_LMODE); |
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| 243 | } else |
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| 244 | --vp->m_start.cno; |
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| 245 | |
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| 246 | if (vp->m_start.lno <= 1) |
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| 247 | goto sof; |
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| 248 | |
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| 249 | /* Figure out what state we're currently in. */ |
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| 250 | if (db_get(sp, lno, 0, &p, &len)) |
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| 251 | goto sof; |
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| 252 | |
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| 253 | /* |
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| 254 | * If we start in text, we want to switch states |
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| 255 | * (2 * N - 1) times, in non-text, (2 * N) times. |
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| 256 | */ |
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| 257 | cnt = F_ISSET(vp, VC_C1SET) ? vp->count : 1; |
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| 258 | cnt *= 2; |
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| 259 | if (len == 0 || v_isempty(p, len)) |
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| 260 | pstate = P_INBLANK; |
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| 261 | else { |
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| 262 | --cnt; |
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| 263 | pstate = P_INTEXT; |
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| 264 | |
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| 265 | /* |
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| 266 | * !!! |
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| 267 | * If the starting cursor is past the first column, |
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| 268 | * the current line is checked for a paragraph. |
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| 269 | */ |
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| 270 | if (vp->m_start.cno > 0) |
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| 271 | ++lno; |
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| 272 | } |
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| 273 | |
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| 274 | for (;;) { |
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| 275 | if (db_get(sp, --lno, 0, &p, &len)) |
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| 276 | goto sof; |
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| 277 | switch (pstate) { |
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| 278 | case P_INTEXT: |
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| 279 | INTEXT_CHECK; |
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| 280 | break; |
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| 281 | case P_INBLANK: |
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| 282 | if (len != 0 && !v_isempty(p, len)) { |
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| 283 | if (!--cnt) |
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| 284 | goto found; |
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| 285 | pstate = P_INTEXT; |
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| 286 | } |
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| 287 | break; |
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| 288 | default: |
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| 289 | abort(); |
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| 290 | } |
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| 291 | } |
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| 292 | |
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| 293 | /* SOF is a movement sink. */ |
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| 294 | sof: lno = 1; |
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| 295 | |
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| 296 | found: vp->m_stop.lno = lno; |
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| 297 | vp->m_stop.cno = 0; |
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| 298 | |
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| 299 | /* |
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| 300 | * All commands move to the end of the range. (We already |
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| 301 | * adjusted the start of the range for motion commands). |
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| 302 | */ |
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| 303 | vp->m_final = vp->m_stop; |
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| 304 | return (0); |
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| 305 | } |
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| 306 | |
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| 307 | /* |
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| 308 | * v_buildps -- |
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| 309 | * Build the paragraph command search pattern. |
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| 310 | * |
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| 311 | * PUBLIC: int v_buildps __P((SCR *, char *, char *)); |
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| 312 | */ |
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| 313 | int |
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| 314 | v_buildps(sp, p_p, s_p) |
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| 315 | SCR *sp; |
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| 316 | char *p_p, *s_p; |
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| 317 | { |
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| 318 | VI_PRIVATE *vip; |
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| 319 | size_t p_len, s_len; |
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| 320 | char *p; |
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| 321 | |
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| 322 | /* |
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| 323 | * The vi paragraph command searches for either a paragraph or |
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| 324 | * section option macro. |
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| 325 | */ |
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| 326 | p_len = p_p == NULL ? 0 : strlen(p_p); |
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| 327 | s_len = s_p == NULL ? 0 : strlen(s_p); |
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| 328 | |
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| 329 | if (p_len == 0 && s_len == 0) |
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| 330 | return (0); |
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| 331 | |
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| 332 | MALLOC_RET(sp, p, char *, p_len + s_len + 1); |
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| 333 | |
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| 334 | vip = VIP(sp); |
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| 335 | if (vip->ps != NULL) |
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| 336 | free(vip->ps); |
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| 337 | |
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| 338 | if (p_p != NULL) |
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| 339 | memmove(p, p_p, p_len + 1); |
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| 340 | if (s_p != NULL) |
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| 341 | memmove(p + p_len, s_p, s_len + 1); |
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| 342 | vip->ps = p; |
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| 343 | return (0); |
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| 344 | } |
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