1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
|
/* $OpenBSD: match.c,v 1.19 2015/06/03 23:40:01 bcallah Exp $ */
/* This file is in the public domain. */
/*
* Limited parenthesis matching routines
*
* The hacks in this file implement automatic matching * of (), [], {}, and
* other characters. It would be better to have a full-blown syntax table,
* but there's enough overhead in the editor as it is.
*/
#include <sys/queue.h>
#include <signal.h>
#include <stdio.h>
#include "def.h"
#include "key.h"
static int balance(void);
static void displaymatch(struct line *, int);
/*
* Balance table. When balance() encounters a character that is to be
* matched, it first searches this table for a balancing left-side character.
* If the character is not in the table, the character is balanced by itself.
*/
static struct balance {
char left, right;
} bal[] = {
{ '(', ')' },
{ '[', ']' },
{ '{', '}' },
{ '<', '>' },
{ '\0', '\0' }
};
/*
* Hack to show matching paren. Self-insert character, then show matching
* character, if any. Bound to "blink-and-insert".
*/
int
showmatch(int f, int n)
{
int i, s;
for (i = 0; i < n; i++) {
if ((s = selfinsert(FFRAND, 1)) != TRUE)
return (s);
/* unbalanced -- warn user */
if (balance() != TRUE)
dobeep();
}
return (TRUE);
}
/*
* Search for and display a matching character.
*
* This routine does the real work of searching backward
* for a balancing character. If such a balancing character
* is found, it uses displaymatch() to display the match.
*/
static int
balance(void)
{
struct line *clp;
int cbo;
int c, i, depth;
int rbal, lbal;
rbal = key.k_chars[key.k_count - 1];
/* See if there is a matching character -- default to the same */
lbal = rbal;
for (i = 0; bal[i].right != '\0'; i++)
if (bal[i].right == rbal) {
lbal = bal[i].left;
break;
}
/*
* Move behind the inserted character. We are always guaranteed
* that there is at least one character on the line.
*/
clp = curwp->w_dotp;
cbo = curwp->w_doto - 1;
/* init nesting depth */
depth = 0;
for (;;) {
if (cbo == 0) {
clp = lback(clp); /* beginning of line */
if (clp == curbp->b_headp)
return (FALSE);
cbo = llength(clp) + 1;
}
if (--cbo == llength(clp))
c = '\n'; /* end of line */
else
c = lgetc(clp, cbo); /* somewhere in middle */
/*
* Check for a matching character. If still in a nested
* level, pop out of it and continue search. This check
* is done before the nesting check so single-character
* matches will work too.
*/
if (c == lbal) {
if (depth == 0) {
displaymatch(clp, cbo);
return (TRUE);
} else
depth--;
}
/* Check for another level of nesting. */
if (c == rbal)
depth++;
}
/* NOTREACHED */
}
/*
* Display matching character. Matching characters that are not in the
* current window are displayed in the echo line. If in the current window,
* move dot to the matching character, sit there a while, then move back.
*/
static void
displaymatch(struct line *clp, int cbo)
{
struct line *tlp;
int tbo;
int cp;
int bufo;
int c;
int inwindow;
char buf[NLINE];
/*
* Figure out if matching char is in current window by
* searching from the top of the window to dot.
*/
inwindow = FALSE;
for (tlp = curwp->w_linep; tlp != lforw(curwp->w_dotp);
tlp = lforw(tlp))
if (tlp == clp)
inwindow = TRUE;
if (inwindow == TRUE) {
tlp = curwp->w_dotp; /* save current position */
tbo = curwp->w_doto;
curwp->w_dotp = clp; /* move to new position */
curwp->w_doto = cbo;
curwp->w_rflag |= WFMOVE;
update(CMODE); /* show match */
ttwait(1000); /* wait for key or 1 second */
curwp->w_dotp = tlp; /* return to old position */
curwp->w_doto = tbo;
curwp->w_rflag |= WFMOVE;
update(CMODE);
} else {
/* match is not in this window, so display line in echo area */
bufo = 0;
for (cp = 0; cp < llength(clp); cp++) {
c = lgetc(clp, cp);
if (c != '\t'
#ifdef NOTAB
|| (curbp->b_flag & BFNOTAB)
#endif
)
if (ISCTRL(c)) {
buf[bufo++] = '^';
buf[bufo++] = CCHR(c);
} else
buf[bufo++] = c;
else
do {
buf[bufo++] = ' ';
} while (bufo & 7);
}
buf[bufo++] = '\0';
ewprintf("Matches %s", buf);
}
}
|
