Skip to content
Navigation Menu
{{ message }}
-
Notifications
You must be signed in to change notification settings - Fork 0
Expand file tree
/
Copy pathstdio.py
More file actions
354 lines (299 loc) · 10.1 KB
/
Copy pathstdio.py
File metadata and controls
354 lines (299 loc) · 10.1 KB
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
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
"""
stdio.py
The stdio module supports reading from standard input and writing to
sys.stdout.
Note: Usually it's a bad idea to mix these three sets of reading
functions:
-- isEmpty(), readInt(), readFloat(), readBool(), readString()
-- hasNextLine(), readLine()
-- readAll(), readAllInts(), readAllFloats(), readAllBools(),
readAllStrings(), readAllLines()
Usually it's better to use one set exclusively.
"""
import sys
import re
#-----------------------------------------------------------------------
# Change sys.stdin so it provides universal newline support.
if (sys.hexversion < 0x03000000):
import os
sys.stdin = os.fdopen(sys.stdin.fileno(), 'rU', 0)
else:
sys.stdin = open(sys.stdin.fileno(), 'r', newline=None)
#=======================================================================
# Writing functions
#=======================================================================
def writeln(x=''):
"""
Write x and an end-of-line mark to standard output.
"""
if sys.hexversion < 0x03000000:
x = unicode(x)
x = x.encode('utf-8')
else:
x = str(x)
sys.stdout.write(x)
sys.stdout.write('\n')
sys.stdout.flush()
#-----------------------------------------------------------------------
def write(x=''):
"""
Write x to standard output.
"""
if (sys.hexversion < 0x03000000):
x = unicode(x)
x = x.encode('utf-8')
else:
x = str(x)
sys.stdout.write(x)
sys.stdout.flush()
#-----------------------------------------------------------------------
def writef(fmt, *args):
"""
Write each element of args to standard output. Use the format
specified by string fmt.
"""
x = fmt % args
if sys.hexversion < 0x03000000:
x = unicode(x)
x = x.encode('utf-8')
sys.stdout.write(x)
sys.stdout.flush()
#=======================================================================
# Reading functions
#=======================================================================
_buffer = ''
#-----------------------------------------------------------------------
def _readRegExp(regExp):
"""
Discard leading white space characters from standard input. Then read
from standard input and return a string matching regular expression
regExp. Raise an EOFError if no non-whitespace characters remain
in standard input. Raise a ValueError if the next characters to
be read from standard input do not match 'regExp'.
"""
global _buffer
if isEmpty():
raise EOFError()
compiledRegExp = re.compile(r'^\s*' + regExp)
match = compiledRegExp.search(_buffer)
if match is None:
raise ValueError()
s = match.group()
_buffer = _buffer[match.end():]
return s.lstrip()
#-----------------------------------------------------------------------
def isEmpty():
"""
Return True if no non-whitespace characters remain in standard
input. Otherwise return False.
"""
global _buffer
while _buffer.strip() == '':
line = sys.stdin.readline()
if sys.hexversion < 0x03000000:
line = line.decode('utf-8')
if line == '':
return True
_buffer += line
return False
#-----------------------------------------------------------------------
def readInt():
"""
Discard leading white space characters from standard input. Then
read from standard input a sequence of characters comprising an
integer. Convert the sequence of characters to an integer, and
return the integer. Raise an EOFError if no non-whitespace
characters remain in standard input. Raise a ValueError if the
next characters to be read from standard input cannot comprise
an integer.
"""
s = _readRegExp(r'[-+]?(0[xX][\dA-Fa-f]+|0[0-7]*|\d+)')
radix = 10
strLength = len(s)
if (strLength >= 1) and (s[0:1] == '0'): radix = 8
if (strLength >= 2) and (s[0:2] == '-0'): radix = 8
if (strLength >= 2) and (s[0:2] == '0x'): radix = 16
if (strLength >= 2) and (s[0:2] == '0X'): radix = 16
if (strLength >= 3) and (s[0:3] == '-0x'): radix = 16
if (strLength >= 3) and (s[0:3] == '-0X'): radix = 16
return int(s, radix)
#-----------------------------------------------------------------------
def readAllInts():
"""
Read all remaining strings from standard input, convert each to
an int, and return those ints in an array. Raise a ValueError if
any of the strings cannot be converted to an int.
"""
strings = readAllStrings()
ints = []
for s in strings:
i = int(s)
ints.append(i)
return ints
#-----------------------------------------------------------------------
def readFloat():
"""
Discard leading white space characters from standard input. Then
read from standard input a sequence of characters comprising a
float. Convert the sequence of characters to a float, and return the
float. Raise an EOFError if no non-whitespace characters remain
in standard input. Raise a ValueError if the next characters to be
read from standard input cannot comprise a float.
"""
s = _readRegExp(r'[-+]?(\d+(\.\d*)?|\.\d+)([eE][-+]?\d+)?')
return float(s)
#-----------------------------------------------------------------------
def readAllFloats():
"""
Read all remaining strings from standard input, convert each to
a float, and return those floats in an array. Raise a ValueError if
any of the strings cannot be converted to a float.
"""
strings = readAllStrings()
floats = []
for s in strings:
f = float(s)
floats.append(f)
return floats
#-----------------------------------------------------------------------
def readBool():
"""
Discard leading white space characters from standard input. Then
read from standard input a sequence of characters comprising a bool.
Convert the sequence of characters to a bool, and return the
bool. Raise an EOFError if no non-whitespace characters remain
in standard input. Raise a ValueError if the next characters to be
read from standard input cannot comprise a bool.
These character sequences can comprise a bool:
-- True
-- False
-- 1 (means true)
-- 0 (means false)
"""
s = _readRegExp(r'(True)|(False)|1|0')
if (s == 'True') or (s == '1'):
return True
return False
#-----------------------------------------------------------------------
def readAllBools():
"""
Read all remaining strings from standard input, convert each to
a bool, and return those bools in an array. Raise a ValueError if
any of the strings cannot be converted to a bool.
"""
strings = readAllStrings()
bools = []
for s in strings:
b = bool(s)
bools.append(b)
return bools
#-----------------------------------------------------------------------
def readString():
"""
Discard leading white space characters from standard input. Then
read from standard input a sequence of characters comprising a
string, and return the string. Raise an EOFError if no
non-whitespace characters remain in standard input.
"""
s = _readRegExp(r'\S+')
return s
#-----------------------------------------------------------------------
def readAllStrings():
"""
Read all remaining strings from standard input, and return them in
an array.
"""
strings = []
while not isEmpty():
s = readString()
strings.append(s)
return strings
#-----------------------------------------------------------------------
def hasNextLine():
"""
Return True if standard input has a next line. Otherwise return
False.
"""
global _buffer
if _buffer != '':
return True
else:
_buffer = sys.stdin.readline()
if sys.hexversion < 0x03000000:
_buffer = _buffer.decode('utf-8')
if _buffer == '':
return False
return True
#-----------------------------------------------------------------------
def readLine():
"""
Read and return as a string the next line of standard input.
Raise an EOFError is there is no next line.
"""
global _buffer
if not hasNextLine():
raise EOFError()
s = _buffer
_buffer = ''
return s.rstrip('\n')
#-----------------------------------------------------------------------
def readAllLines():
"""
Read all remaining lines from standard input, and return them as
strings in an array.
"""
lines = []
while hasNextLine():
line = readLine()
lines.append(line)
return lines
#-----------------------------------------------------------------------
def readAll():
"""
Read and return as a string all remaining lines of standard input.
"""
global _buffer
s = _buffer
_buffer = ''
for line in sys.stdin:
if sys.hexversion < 0x03000000:
line = line.decode('utf-8')
s += line
return s
#=======================================================================
# For Testing
#=======================================================================
def _testWrite():
writeln()
writeln('string')
writeln(123456)
writeln(123.456)
writeln(True)
write()
write('string')
write(123456)
write(123.456)
write(True)
writeln()
writef('<%s> <%8d> <%14.8f>\n', 'string', 123456, 123.456)
writef('formatstring\n')
#-----------------------------------------------------------------------
def _main():
"""
For testing. The command-line argument should be the name of the
function that should be called.
"""
map = {
'readInt': readInt, 'readAllInts': readAllInts,
'readFloat': readFloat, 'readAllFloats': readAllFloats,
'readBool': readBool, 'readAllBools': readAllBools,
'readString': readString, 'readAllStrings': readAllStrings,
'readLine': readLine, 'readAllLines' : readAllLines,
'readAll': readAll }
testId = sys.argv[1]
if testId == 'write':
_testWrite()
else:
writeln(map[testId]())
if __name__ == '__main__':
_main()
You can’t perform that action at this time.