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/* $OpenBSD: v_match.c,v 1.9 2016/01/06 22:28:52 millert Exp $ */ |
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/*- |
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* Copyright (c) 1992, 1993, 1994 |
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* The Regents of the University of California. All rights reserved. |
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* Copyright (c) 1992, 1993, 1994, 1995, 1996 |
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* Keith Bostic. All rights reserved. |
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* |
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* See the LICENSE file for redistribution information. |
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*/ |
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#include "config.h" |
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#include <sys/types.h> |
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#include <sys/queue.h> |
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#include <sys/time.h> |
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#include <bitstring.h> |
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#include <ctype.h> |
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#include <limits.h> |
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#include <stdio.h> |
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#include <string.h> |
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#include "../common/common.h" |
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#include "vi.h" |
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/* |
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* v_match -- % |
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* Search to matching character. |
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* |
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* PUBLIC: int v_match(SCR *, VICMD *); |
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*/ |
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int |
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v_match(SCR *sp, VICMD *vp) |
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{ |
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VCS cs; |
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MARK *mp; |
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size_t cno, len, off; |
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int cnt, isempty, matchc, startc, (*gc)(SCR *, VCS *); |
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char *p; |
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/* |
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* !!! |
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* Historic practice; ignore the count. |
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* |
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* !!! |
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* Historical practice was to search for the initial character in the |
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* forward direction only. |
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*/ |
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if (db_eget(sp, vp->m_start.lno, &p, &len, &isempty)) { |
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if (isempty) |
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goto nomatch; |
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return (1); |
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} |
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for (off = vp->m_start.cno;; ++off) { |
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if (off >= len) { |
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nomatch: msgq(sp, M_BERR, "No match character on this line"); |
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return (1); |
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} |
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switch (startc = p[off]) { |
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case '(': |
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matchc = ')'; |
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gc = cs_next; |
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break; |
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case ')': |
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matchc = '('; |
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gc = cs_prev; |
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break; |
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case '[': |
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matchc = ']'; |
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gc = cs_next; |
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break; |
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case ']': |
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matchc = '['; |
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gc = cs_prev; |
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break; |
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case '{': |
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matchc = '}'; |
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gc = cs_next; |
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break; |
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case '}': |
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matchc = '{'; |
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gc = cs_prev; |
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break; |
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case '<': |
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matchc = '>'; |
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gc = cs_next; |
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break; |
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case '>': |
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matchc = '<'; |
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gc = cs_prev; |
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break; |
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default: |
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continue; |
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} |
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break; |
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} |
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cs.cs_lno = vp->m_start.lno; |
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cs.cs_cno = off; |
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if (cs_init(sp, &cs)) |
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return (1); |
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for (cnt = 1;;) { |
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if (gc(sp, &cs)) |
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return (1); |
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if (cs.cs_flags != 0) { |
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if (cs.cs_flags == CS_EOF || cs.cs_flags == CS_SOF) |
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break; |
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continue; |
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} |
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if (cs.cs_ch == startc) |
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++cnt; |
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else if (cs.cs_ch == matchc && --cnt == 0) |
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break; |
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} |
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if (cnt) { |
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msgq(sp, M_BERR, "Matching character not found"); |
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return (1); |
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} |
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vp->m_stop.lno = cs.cs_lno; |
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vp->m_stop.cno = cs.cs_cno; |
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/* |
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* If moving right, non-motion commands move to the end of the range. |
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* Delete and yank stay at the start. |
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* |
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* If moving left, all commands move to the end of the range. |
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* |
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* !!! |
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* Don't correct for leftward movement -- historic vi deleted the |
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* starting cursor position when deleting to a match. |
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*/ |
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if (vp->m_start.lno < vp->m_stop.lno || |
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(vp->m_start.lno == vp->m_stop.lno && |
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vp->m_start.cno < vp->m_stop.cno)) |
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vp->m_final = ISMOTION(vp) ? vp->m_start : vp->m_stop; |
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else |
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vp->m_final = vp->m_stop; |
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/* |
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* !!! |
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* If the motion is across lines, and the earliest cursor position |
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* is at or before any non-blank characters in the line, i.e. the |
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* movement is cutting all of the line's text, and the later cursor |
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* position has nothing other than whitespace characters between it |
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* and the end of its line, the buffer is in line mode. |
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*/ |
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if (!ISMOTION(vp) || vp->m_start.lno == vp->m_stop.lno) |
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return (0); |
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mp = vp->m_start.lno < vp->m_stop.lno ? &vp->m_start : &vp->m_stop; |
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if (mp->cno != 0) { |
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cno = 0; |
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if (nonblank(sp, mp->lno, &cno)) |
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return (1); |
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if (cno < mp->cno) |
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return (0); |
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} |
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mp = vp->m_start.lno < vp->m_stop.lno ? &vp->m_stop : &vp->m_start; |
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if (db_get(sp, mp->lno, DBG_FATAL, &p, &len)) |
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return (1); |
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for (p += mp->cno + 1, len -= mp->cno; --len; ++p) |
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if (!isblank(*p)) |
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return (0); |
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F_SET(vp, VM_LMODE); |
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return (0); |
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} |