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
|
local ltn12 = require("ltn12")
dofile("testsupport.lua")
local function format(chunk)
if chunk then
if chunk == "" then return "''"
else return string.len(chunk) end
else return "nil" end
end
local function show(name, input, output)
local sin = format(input)
local sout = format(output)
io.write(name, ": ", sin, " -> ", sout, "\n")
end
local function chunked(length)
local tmp
return function(chunk)
local ret
if chunk and chunk ~= "" then
tmp = chunk
end
ret = string.sub(tmp, 1, length)
tmp = string.sub(tmp, length+1)
if not chunk and ret == "" then ret = nil end
return ret
end
end
local function named(f, name)
return function(chunk)
local ret = f(chunk)
show(name, chunk, ret)
return ret
end
end
--------------------------------
local function split(size)
local buffer = ""
local last_out = ""
local last_in = ""
local function output(chunk)
local part = string.sub(buffer, 1, size)
buffer = string.sub(buffer, size+1)
last_out = (part ~= "" or chunk) and part
last_in = chunk
return last_out
end
return function(chunk, done)
if done then
return not last_in and not last_out
end
-- check if argument is consistent with state
if not chunk then
if last_in and last_in ~= "" and last_out ~= "" then
error("nil chunk following data chunk", 2)
end
if not last_out then error("extra nil chunk", 2) end
return output(chunk)
elseif chunk == "" then
if last_out == "" then error('extra "" chunk', 2) end
if not last_out then error('"" chunk following nil return', 2) end
if not last_in then error('"" chunk following nil chunk', 2) end
return output(chunk)
else
if not last_in then error("data chunk following nil chunk", 2) end
if last_in ~= "" and last_out ~= "" then
error("data chunk following data chunk", 2)
end
buffer = chunk
return output(chunk)
end
end
end
--------------------------------
local function format(chunk)
if chunk then
if chunk == "" then return "''"
else return string.len(chunk) end
else return "nil" end
end
--------------------------------
local function merge(size)
local buffer = ""
local last_out = ""
local last_in = ""
local function output(chunk)
local part
if string.len(buffer) >= size or not chunk then
part = buffer
buffer = ""
else
part = ""
end
last_out = (part ~= "" or chunk) and part
last_in = chunk
return last_out
end
return function(chunk, done)
if done then
return not last_in and not last_out
end
-- check if argument is consistent with state
if not chunk then
if last_in and last_in ~= "" and last_out ~= "" then
error("nil chunk following data chunk", 2)
end
if not last_out then error("extra nil chunk", 2) end
return output(chunk)
elseif chunk == "" then
if last_out == "" then error('extra "" chunk', 2) end
if not last_out then error('"" chunk following nil return', 2) end
if not last_in then error('"" chunk following nil chunk', 2) end
return output(chunk)
else
if not last_in then error("data chunk following nil chunk", 2) end
if last_in ~= "" and last_out ~= "" then
error("data chunk following data chunk", 2)
end
buffer = buffer .. chunk
return output(chunk)
end
end
end
--------------------------------
io.write("testing sink.table: ")
local sink, t = ltn12.sink.table()
local s, c = "", ""
for i = 0, 10 do
c = string.rep(string.char(i), i)
s = s .. c
assert(sink(c), "returned error")
end
assert(sink(nil), "returned error")
assert(table.concat(t) == s, "mismatch")
print("ok")
--------------------------------
io.write("testing sink.chain (with split): ")
sink, t = ltn12.sink.table()
local filter = split(3)
sink = ltn12.sink.chain(filter, sink)
s = "123456789012345678901234567890"
assert(sink(s), "returned error")
assert(sink(s), "returned error")
assert(sink(nil), "returned error")
assert(table.concat(t) == s .. s, "mismatch")
assert(filter(nil, 1), "filter not empty")
print("ok")
--------------------------------
io.write("testing sink.chain (with merge): ")
sink, t = ltn12.sink.table()
filter = merge(10)
sink = ltn12.sink.chain(filter, sink)
s = string.rep("123", 30)
s = s .. string.rep("4321", 30)
for i = 1, 30 do
assert(sink("123"), "returned error")
end
for i = 1, 30 do
assert(sink("4321"), "returned error")
end
assert(sink(nil), "returned error")
assert(filter(nil, 1), "filter not empty")
assert(table.concat(t) == s, "mismatch")
print("ok")
--------------------------------
io.write("testing source.string and pump.all: ")
local source = ltn12.source.string(s)
sink, t = ltn12.sink.table()
assert(ltn12.pump.all(source, sink), "returned error")
assert(table.concat(t) == s, "mismatch")
print("ok")
--------------------------------
io.write("testing source.chain (with split): ")
source = ltn12.source.string(s)
filter = split(5)
source = ltn12.source.chain(source, filter)
sink, t = ltn12.sink.table()
assert(ltn12.pump.all(source, sink), "returned error")
assert(table.concat(t) == s, "mismatch")
assert(filter(nil, 1), "filter not empty")
print("ok")
--------------------------------
io.write("testing source.chain (with split) and sink.chain (with merge): ")
source = ltn12.source.string(s)
filter = split(5)
source = ltn12.source.chain(source, filter)
local filter2 = merge(13)
sink, t = ltn12.sink.table()
sink = ltn12.sink.chain(filter2, sink)
assert(ltn12.pump.all(source, sink), "returned error")
assert(table.concat(t) == s, "mismatch")
assert(filter(nil, 1), "filter not empty")
assert(filter2(nil, 1), "filter2 not empty")
print("ok")
--------------------------------
io.write("testing filter.chain (and sink.chain, with split, merge): ")
source = ltn12.source.string(s)
filter = split(5)
filter2 = merge(13)
local chain = ltn12.filter.chain(filter, filter2)
sink, t = ltn12.sink.table()
sink = ltn12.sink.chain(chain, sink)
assert(ltn12.pump.all(source, sink), "returned error")
assert(table.concat(t) == s, "mismatch")
assert(filter(nil, 1), "filter not empty")
assert(filter2(nil, 1), "filter2 not empty")
print("ok")
--------------------------------
io.write("testing filter.chain (and sink.chain, a bunch): ")
source = ltn12.source.string(s)
filter = split(5)
filter2 = merge(13)
local filter3 = split(7)
local filter4 = merge(11)
local filter5 = split(10)
chain = ltn12.filter.chain(filter, filter2, filter3, filter4, filter5)
sink, t = ltn12.sink.table()
sink = ltn12.sink.chain(chain, sink)
assert(ltn12.pump.all(source, sink))
assert(table.concat(t) == s, "mismatch")
assert(filter(nil, 1), "filter not empty")
assert(filter2(nil, 1), "filter2 not empty")
assert(filter3(nil, 1), "filter3 not empty")
assert(filter4(nil, 1), "filter4 not empty")
assert(filter5(nil, 1), "filter5 not empty")
print("ok")
--------------------------------
io.write("testing filter.chain (and source.chain, with split, merge): ")
source = ltn12.source.string(s)
filter = split(5)
filter2 = merge(13)
local chain = ltn12.filter.chain(filter, filter2)
sink, t = ltn12.sink.table()
source = ltn12.source.chain(source, chain)
assert(ltn12.pump.all(source, sink), "returned error")
assert(table.concat(t) == s, "mismatch")
assert(filter(nil, 1), "filter not empty")
assert(filter2(nil, 1), "filter2 not empty")
print("ok")
--------------------------------
io.write("testing filter.chain (and source.chain, a bunch): ")
source = ltn12.source.string(s)
filter = split(5)
filter2 = merge(13)
local filter3 = split(7)
local filter4 = merge(11)
local filter5 = split(10)
chain = ltn12.filter.chain(filter, filter2, filter3, filter4, filter5)
sink, t = ltn12.sink.table()
source = ltn12.source.chain(source, chain)
assert(ltn12.pump.all(source, sink))
assert(table.concat(t) == s, "mismatch")
assert(filter(nil, 1), "filter not empty")
assert(filter2(nil, 1), "filter2 not empty")
assert(filter3(nil, 1), "filter3 not empty")
assert(filter4(nil, 1), "filter4 not empty")
assert(filter5(nil, 1), "filter5 not empty")
print("ok")
|
