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
|
-- filename : l-io.lua
-- comment : split off from luat-lib
-- author : Hans Hagen, PRAGMA-ADE, Hasselt NL
-- copyright: PRAGMA ADE / ConTeXt Development Team
-- license : see context related readme files
if not versions then versions = { } end versions['l-io'] = 1.001
if string.find(os.getenv("PATH"),";") then
io.fileseparator, io.pathseparator = "\\", ";"
else
io.fileseparator, io.pathseparator = "/" , ":"
end
function io.loaddata(filename)
local f = io.open(filename,'rb')
if f then
local data = f:read('*all')
f:close()
return data
else
return nil
end
end
function io.savedata(filename,data,joiner)
local f = io.open(filename, "wb")
if f then
if type(data) == "table" then
f:write(table.join(data,joiner or ""))
elseif type(data) == "function" then
data(f)
else
f:write(data)
end
f:close()
end
end
function io.exists(filename)
local f = io.open(filename)
if f == nil then
return false
else
assert(f:close())
return true
end
end
function io.size(filename)
local f = io.open(filename)
if f == nil then
return 0
else
local s = f:seek("end")
assert(f:close())
return s
end
end
function io.noflines(f)
local n = 0
for _ in f:lines() do
n = n + 1
end
f:seek('set',0)
return n
end
do
local sb = string.byte
local nextchar = {
[ 4] = function(f)
return f:read(1,1,1,1)
end,
[ 2] = function(f)
return f:read(1,1)
end,
[ 1] = function(f)
return f:read(1)
end,
[-2] = function(f)
local a, b = f:read(1,1)
return b, a
end,
[-4] = function(f)
local a, b, c, d = f:read(1,1,1,1)
return d, c, b, a
end
}
function io.characters(f,n)
if f then
return nextchar[n or 1], f
else
return nil, nil
end
end
end
do
local sb = string.byte
--~ local nextbyte = {
--~ [4] = function(f)
--~ local a = f:read(1)
--~ local b = f:read(1)
--~ local c = f:read(1)
--~ local d = f:read(1)
--~ if d then
--~ return sb(a), sb(b), sb(c), sb(d)
--~ else
--~ return nil, nil, nil, nil
--~ end
--~ end,
--~ [2] = function(f)
--~ local a = f:read(1)
--~ local b = f:read(1)
--~ if b then
--~ return sb(a), sb(b)
--~ else
--~ return nil, nil
--~ end
--~ end,
--~ [1] = function (f)
--~ local a = f:read(1)
--~ if a then
--~ return sb(a)
--~ else
--~ return nil
--~ end
--~ end,
--~ [-2] = function (f)
--~ local a = f:read(1)
--~ local b = f:read(1)
--~ if b then
--~ return sb(b), sb(a)
--~ else
--~ return nil, nil
--~ end
--~ end,
--~ [-4] = function(f)
--~ local a = f:read(1)
--~ local b = f:read(1)
--~ local c = f:read(1)
--~ local d = f:read(1)
--~ if d then
--~ return sb(d), sb(c), sb(b), sb(a)
--~ else
--~ return nil, nil, nil, nil
--~ end
--~ end
--~ }
local nextbyte = {
[4] = function(f)
local a, b, c, d = f:read(1,1,1,1)
if d then
return sb(a), sb(b), sb(c), sb(d)
else
return nil, nil, nil, nil
end
end,
[2] = function(f)
local a, b = f:read(1,1)
if b then
return sb(a), sb(b)
else
return nil, nil
end
end,
[1] = function (f)
local a = f:read(1)
if a then
return sb(a)
else
return nil
end
end,
[-2] = function (f)
local a, b = f:read(1,1)
if b then
return sb(b), sb(a)
else
return nil, nil
end
end,
[-4] = function(f)
local a, b, c, d = f:read(1,1,1,1)
if d then
return sb(d), sb(c), sb(b), sb(a)
else
return nil, nil, nil, nil
end
end
}
function io.bytes(f,n)
if f then
return nextbyte[n or 1], f
else
return nil, nil
end
end
end
function io.ask(question,default,options)
while true do
io.write(question)
if options then
io.write(string.format(" [%s]",table.concat(options,"|")))
end
if default then
io.write(string.format(" [%s]",default))
end
io.write(string.format(" "))
local answer = io.read()
answer = answer:gsub("^%s*(.*)%s*$","%1")
if answer == "" and default then
return default
elseif not options then
return answer
else
for _,v in pairs(options) do
if v == answer then
return answer
end
end
local pattern = "^" .. answer
for _,v in pairs(options) do
if v:find(pattern) then
return v
end
end
end
end
end
|
