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
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
|
#!/usr/bin/awk -f
#
# ZyklonB eval plugin, LISP-like expression evaluator
#
# Copyright 2013, 2014 Přemysl Janouch
# See the file LICENSE for licensing information.
#
BEGIN \
{
RS = "\r"
ORS = "\r\n"
IGNORECASE = 1
srand()
prefix = get_config("prefix")
print "ZYKLONB register"
fflush("")
# All functions have to be in this particular array
min_args["int"] = 1
min_args["+"] = 1
min_args["-"] = 1
min_args["*"] = 1
min_args["/"] = 1
min_args["%"] = 1
min_args["^"] = 1
min_args["**"] = 1
min_args["exp"] = 1
min_args["sin"] = 1
min_args["cos"] = 1
min_args["atan2"] = 2
min_args["log"] = 1
min_args["rand"] = 0
min_args["sqrt"] = 1
min_args["pi"] = 0
min_args["e"] = 0
min_args["min"] = 1
min_args["max"] = 1
# Whereas here their presence is only optional
max_args["int"] = 1
max_args["sin"] = 1
max_args["cos"] = 1
max_args["atan2"] = 2
max_args["log"] = 1
max_args["rand"] = 0
max_args["sqrt"] = 1
max_args["pi"] = 0
max_args["e"] = 0
}
{
parse($0)
}
msg_command == "PRIVMSG" \
{
# Context = either channel or user nickname
match(msg_prefix, /^[^!]+/)
ctx = substr(msg_prefix, RSTART, RLENGTH)
if (msg_param[0] ~ /^[#&!+]/)
{
ctx_quote = ctx ": "
ctx = msg_param[0]
}
else
ctx_quote = ""
if (substr(msg_param[1], 1, length(prefix)) == prefix)
{
keyword = "eval"
text = substr(msg_param[1], 1 + length(prefix))
if (match(text, "^" keyword "([^A-Za-z0-9].*|$)"))
process_request(substr(text, 1 + length(keyword)))
}
}
{
fflush("")
}
function pmrespond (text)
{
print "PRIVMSG " ctx " :" ctx_quote text
}
function process_request (input, res, x)
{
delete funs
delete accumulator
delete n_args
res = ""
fun_top = 0
funs[0] = ""
accumulator[0] = 0
n_args[0] = 0
if (match(input, "^[ \t]*"))
input = substr(input, RLENGTH + 1)
if (input == "")
res = "expression missing"
while (res == "" && input != "") {
if (match(input, "^-?[0-9]+\\.?[0-9]*")) {
x = substr(input, RSTART, RLENGTH)
input = substr(input, RLENGTH + 1)
match(input, "^ *")
input = substr(input, RLENGTH + 1)
res = process_argument(x)
} else if (match(input, "^[(]([^ ()]+)")) {
x = substr(input, RSTART + 1, RLENGTH - 1)
input = substr(input, RLENGTH + 1)
match(input, "^ *")
input = substr(input, RLENGTH + 1)
if (!(x in min_args)) {
res = "undefined function '" x "'"
} else {
fun_top++
funs[fun_top] = x
accumulator[fun_top] = 636363
n_args[fun_top] = 0
}
} else if (match(input, "^[)] *")) {
input = substr(input, RLENGTH + 1)
res = process_end()
} else
res = "invalid input at '" substr(input, 1, 10) "...'"
}
if (res == "") {
if (fun_top != 0)
res = "unclosed '" funs[fun_top] "'"
else if (n_args[0] != 1)
res = "internal error, expected one result" \
", got " n_args[0] " instead"
}
if (res == "")
pmrespond(accumulator[0])
else
pmrespond(res)
}
function process_argument (arg)
{
if (fun_top == 0) {
if (n_args[0]++ != 0)
return "too many results, I only expect one"
accumulator[0] = arg
return ""
}
fun = funs[fun_top]
if (fun in max_args && max_args[fun] <= n_args[fun_top])
return "too many operands for " fun
if (fun == "int") {
accumulator[fun_top] = int(arg)
} else if (fun == "+") {
if (n_args[fun_top] == 0)
accumulator[fun_top] = arg
else
accumulator[fun_top] += arg
} else if (fun == "-") {
if (n_args[fun_top] == 0)
accumulator[fun_top] = arg
else
accumulator[fun_top] -= arg
} else if (fun == "*") {
if (n_args[fun_top] == 0)
accumulator[fun_top] = arg
else
accumulator[fun_top] *= arg
} else if (fun == "/") {
if (n_args[fun_top] == 0)
accumulator[fun_top] = arg
else if (arg == 0)
return "division by zero"
else
accumulator[fun_top] /= arg
} else if (fun == "%") {
if (n_args[fun_top] == 0)
accumulator[fun_top] = arg
else if (arg == 0)
return "division by zero"
else
accumulator[fun_top] %= arg
} else if (fun == "^" || fun == "**" || fun == "exp") {
if (n_args[fun_top] == 0)
accumulator[fun_top] = arg
else
accumulator[fun_top] ^= arg
} else if (fun == "sin") {
accumulator[fun_top] = sin(arg)
} else if (fun == "cos") {
accumulator[fun_top] = cos(arg)
} else if (fun == "atan2") {
if (n_args[fun_top] == 0)
accumulator[fun_top] = arg
else
accumulator[fun_top] = atan2(accumulator[fun_top], arg)
} else if (fun == "log") {
accumulator[fun_top] = log(arg)
} else if (fun == "rand") {
# Just for completeness, execution never gets here
} else if (fun == "sqrt") {
accumulator[fun_top] = sqrt(arg)
} else if (fun == "min") {
if (n_args[fun_top] == 0)
accumulator[fun_top] = arg
else if (accumulator[fun_top] > arg)
accumulator[fun_top] = arg
} else if (fun == "max") {
if (n_args[fun_top] == 0)
accumulator[fun_top] = arg
else if (accumulator[fun_top] < arg)
accumulator[fun_top] = arg
} else
return "internal error, unhandled operands for " fun
n_args[fun_top]++
return ""
}
function process_end ()
{
if (fun_top <= 0)
return "extraneous ')'"
fun = funs[fun_top]
if (!(fun in min_args))
return "internal error, unhandled ')' for '" fun "'"
if (min_args[fun] > n_args[fun_top])
return "not enough operands for '" fun "'"
# There's no 'init' function to do it in
if (fun == "rand")
accumulator[fun_top] = rand()
else if (fun == "pi")
accumulator[fun_top] = 3.141592653589793
else if (fun == "e")
accumulator[fun_top] = 2.718281828459045
return process_argument(accumulator[fun_top--])
}
function get_config (key)
{
print "ZYKLONB get_config :" key
fflush("")
getline
parse($0)
return msg_param[0]
}
function parse (line, s, n, id, token)
{
s = 1
id = 0
# NAWK only uses the first character of RS
if (line ~ /^\n/)
line = substr(line, 2)
msg_prefix = ""
msg_command = ""
delete msg_param
n = match(substr(line, s), / |$/)
while (n)
{
token = substr(line, s, n - 1)
if (token ~ /^:/)
{
if (s == 1)
msg_prefix = substr(token, 2)
else
{
msg_param[id] = substr(line, s + 1)
break
}
}
else if (!msg_command)
msg_command = toupper(token)
else
msg_param[id++] = token
s = s + n
n = index(substr(line, s), " ")
if (!n)
{
n = length(substr(line, s)) + 1
if (n == 1)
break;
}
}
}
|
