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
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
|
#include <u.h>
#include <libc.h>
#include <draw.h>
#include <thread.h>
#include <cursor.h>
#include <mouse.h>
#include <keyboard.h>
#include <frame.h>
#include <fcall.h>
#include <plumb.h>
#include "dat.h"
#include "fns.h"
enum
{
None = 0,
Fore = '+',
Back = '-'
};
enum
{
Char,
Line
};
int
isaddrc(int r)
{
if(r && utfrune("0123456789+-/$.#,;?", r)!=nil)
return TRUE;
return FALSE;
}
/*
* quite hard: could be almost anything but white space, but we are a little conservative,
* aiming for regular expressions of alphanumerics and no white space
*/
int
isregexc(int r)
{
if(r == 0)
return FALSE;
if(isalnum(r))
return TRUE;
if(utfrune("^+-.*?#,;[]()$", r)!=nil)
return TRUE;
return FALSE;
}
Range
number(uint showerr, Text *t, Range r, int line, int dir, int size, int *evalp)
{
uint q0, q1;
if(size == Char){
if(dir == Fore)
line = r.q1+line;
else if(dir == Back){
if(r.q0==0 && line>0)
r.q0 = t->file->b.nc;
line = r.q0 - line;
}
if(line<0 || line>t->file->b.nc)
goto Rescue;
*evalp = TRUE;
return range(line, line);
}
q0 = r.q0;
q1 = r.q1;
switch(dir){
case None:
q0 = 0;
q1 = 0;
Forward:
while(line>0 && q1<t->file->b.nc)
if(textreadc(t, q1++) == '\n' || q1==t->file->b.nc)
if(--line > 0)
q0 = q1;
if(line==1 && q1==t->file->b.nc) // 6 goes to end of 5-line file
break;
if(line > 0)
goto Rescue;
break;
case Fore:
if(q1 > 0)
while(q1<t->file->b.nc && textreadc(t, q1-1) != '\n')
q1++;
q0 = q1;
goto Forward;
case Back:
if(q0 < t->file->b.nc)
while(q0>0 && textreadc(t, q0-1)!='\n')
q0--;
q1 = q0;
while(line>0 && q0>0){
if(textreadc(t, q0-1) == '\n'){
if(--line >= 0)
q1 = q0;
}
--q0;
}
/* :1-1 is :0 = #0, but :1-2 is an error */
if(line > 1)
goto Rescue;
while(q0>0 && textreadc(t, q0-1)!='\n')
--q0;
}
*evalp = TRUE;
return range(q0, q1);
Rescue:
if(showerr)
warning(nil, "address out of range\n");
*evalp = FALSE;
return r;
}
Range
regexp(uint showerr, Text *t, Range lim, Range r, Rune *pat, int dir, int *foundp)
{
int found;
Rangeset sel;
int q;
if(pat[0] == '\0' && rxnull()){
if(showerr)
warning(nil, "no previous regular expression\n");
*foundp = FALSE;
return r;
}
if(pat[0] && rxcompile(pat) == FALSE){
*foundp = FALSE;
return r;
}
if(dir == Back)
found = rxbexecute(t, r.q0, &sel);
else{
if(lim.q0 < 0)
q = Infinity;
else
q = lim.q1;
found = rxexecute(t, nil, r.q1, q, &sel);
}
if(!found && showerr)
warning(nil, "no match for regexp\n");
*foundp = found;
return sel.r[0];
}
Range
address(uint showerr, Text *t, Range lim, Range ar, void *a, uint q0, uint q1, int (*getc)(void*, uint), int *evalp, uint *qp)
{
int dir, size, npat;
int prevc, c, nc, n;
uint q;
Rune *pat;
Range r, nr;
r = ar;
q = q0;
dir = None;
size = Line;
c = 0;
while(q < q1){
prevc = c;
c = (*getc)(a, q++);
switch(c){
default:
*qp = q-1;
return r;
case ';':
ar = r;
/* fall through */
case ',':
if(prevc == 0) /* lhs defaults to 0 */
r.q0 = 0;
if(q>=q1 && t!=nil && t->file!=nil) /* rhs defaults to $ */
r.q1 = t->file->b.nc;
else{
nr = address(showerr, t, lim, ar, a, q, q1, getc, evalp, &q);
r.q1 = nr.q1;
}
*qp = q;
return r;
case '+':
case '-':
if(*evalp && (prevc=='+' || prevc=='-'))
if((nc=(*getc)(a, q))!='#' && nc!='/' && nc!='?')
r = number(showerr, t, r, 1, prevc, Line, evalp); /* do previous one */
dir = c;
break;
case '.':
case '$':
if(q != q0+1){
*qp = q-1;
return r;
}
if(*evalp)
if(c == '.')
r = ar;
else
r = range(t->file->b.nc, t->file->b.nc);
if(q < q1)
dir = Fore;
else
dir = None;
break;
case '#':
if(q==q1 || (c=(*getc)(a, q++))<'0' || '9'<c){
*qp = q-1;
return r;
}
size = Char;
/* fall through */
case '0': case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
n = c -'0';
while(q<q1){
c = (*getc)(a, q++);
if(c<'0' || '9'<c){
q--;
break;
}
n = n*10+(c-'0');
}
if(*evalp)
r = number(showerr, t, r, n, dir, size, evalp);
dir = None;
size = Line;
break;
case '?':
dir = Back;
/* fall through */
case '/':
npat = 0;
pat = nil;
while(q<q1){
c = (*getc)(a, q++);
switch(c){
case '\n':
--q;
goto out;
case '\\':
pat = runerealloc(pat, npat+1);
pat[npat++] = c;
if(q == q1)
goto out;
c = (*getc)(a, q++);
break;
case '/':
goto out;
}
pat = runerealloc(pat, npat+1);
pat[npat++] = c;
}
out:
pat = runerealloc(pat, npat+1);
pat[npat] = 0;
if(*evalp)
r = regexp(showerr, t, lim, r, pat, dir, evalp);
free(pat);
dir = None;
size = Line;
break;
}
}
if(*evalp && dir != None)
r = number(showerr, t, r, 1, dir, Line, evalp); /* do previous one */
*qp = q;
return r;
}
|