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
|
#
# stringio.rb
#
#--
# Copyright (c) 1998-2003 Minero Aoki <aamine@loveruby.net>
#
# Permission is hereby granted, free of charge, to any person obtaining
# a copy of this software and associated documentation files (the
# "Software"), to deal in the Software without restriction, including
# without limitation the rights to use, copy, modify, merge, publish,
# distribute, sublicense, and/or sell copies of the Software, and to
# permit persons to whom the Software is furnished to do so, subject to
# the following conditions:
#
# The above copyright notice and this permission notice shall be
# included in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
#
# Note: Originally licensed under LGPL v2+. Using MIT license for Rails
# with permission of Minero Aoki.
#++
class StringInput#:nodoc:
include Enumerable
class << self
def new( str )
if block_given?
begin
f = super
yield f
ensure
f.close if f
end
else
super
end
end
alias open new
end
def initialize( str )
@src = str
@pos = 0
@closed = false
@lineno = 0
end
attr_reader :lineno
def string
@src
end
def inspect
"#<#{self.class}:#{@closed ? 'closed' : 'open'},src=#{@src[0,30].inspect}>"
end
def close
stream_check!
@pos = nil
@closed = true
end
def closed?
@closed
end
def pos
stream_check!
[@pos, @src.size].min
end
alias tell pos
def seek( offset, whence = IO::SEEK_SET )
stream_check!
case whence
when IO::SEEK_SET
@pos = offset
when IO::SEEK_CUR
@pos += offset
when IO::SEEK_END
@pos = @src.size - offset
else
raise ArgumentError, "unknown seek flag: #{whence}"
end
@pos = 0 if @pos < 0
@pos = [@pos, @src.size + 1].min
offset
end
def rewind
stream_check!
@pos = 0
end
def eof?
stream_check!
@pos > @src.size
end
def each( &block )
stream_check!
begin
@src.each(&block)
ensure
@pos = 0
end
end
def gets
stream_check!
if idx = @src.index(?\n, @pos)
idx += 1 # "\n".size
line = @src[ @pos ... idx ]
@pos = idx
@pos += 1 if @pos == @src.size
else
line = @src[ @pos .. -1 ]
@pos = @src.size + 1
end
@lineno += 1
line
end
def getc
stream_check!
ch = @src[@pos]
@pos += 1
@pos += 1 if @pos == @src.size
ch
end
def read( len = nil )
stream_check!
return read_all unless len
str = @src[@pos, len]
@pos += len
@pos += 1 if @pos == @src.size
str
end
alias sysread read
def read_all
stream_check!
return nil if eof?
rest = @src[@pos ... @src.size]
@pos = @src.size + 1
rest
end
def stream_check!
@closed and raise IOError, 'closed stream'
end
end
class StringOutput#:nodoc:
class << self
def new( str = '' )
if block_given?
begin
f = super
yield f
ensure
f.close if f
end
else
super
end
end
alias open new
end
def initialize( str = '' )
@dest = str
@closed = false
end
def close
@closed = true
end
def closed?
@closed
end
def string
@dest
end
alias value string
alias to_str string
def size
@dest.size
end
alias pos size
def inspect
"#<#{self.class}:#{@dest ? 'open' : 'closed'},#{id}>"
end
def print( *args )
stream_check!
raise ArgumentError, 'wrong # of argument (0 for >1)' if args.empty?
args.each do |s|
raise ArgumentError, 'nil not allowed' if s.nil?
@dest << s.to_s
end
nil
end
def puts( *args )
stream_check!
args.each do |str|
@dest << (s = str.to_s)
@dest << "\n" unless s[-1] == ?\n
end
@dest << "\n" if args.empty?
nil
end
def putc( ch )
stream_check!
@dest << ch.chr
nil
end
def printf( *args )
stream_check!
@dest << sprintf(*args)
nil
end
def write( str )
stream_check!
s = str.to_s
@dest << s
s.size
end
alias syswrite write
def <<( str )
stream_check!
@dest << str.to_s
self
end
private
def stream_check!
@closed and raise IOError, 'closed stream'
end
end
|
