| 1 |
1630
|
aaronmk
|
# I/O
|
| 2 |
|
|
|
| 3 |
4917
|
aaronmk
|
import operator
|
| 4 |
1673
|
aaronmk
|
import timeouts
|
| 5 |
1635
|
aaronmk
|
|
| 6 |
1928
|
aaronmk
|
##### Exceptions
|
| 7 |
|
|
|
| 8 |
|
|
class InputStreamsOnlyException(Exception):
|
| 9 |
|
|
def __init__(self): Exception.__init__(self, 'Only input streams allowed')
|
| 10 |
|
|
|
| 11 |
1759
|
aaronmk
|
##### Wrapped streams
|
| 12 |
|
|
|
| 13 |
1635
|
aaronmk
|
class WrapStream:
|
| 14 |
|
|
'''Forwards close() to the underlying stream'''
|
| 15 |
|
|
def __init__(self, stream): self.stream = stream
|
| 16 |
|
|
|
| 17 |
|
|
def close(self): self.stream.close()
|
| 18 |
|
|
|
| 19 |
1759
|
aaronmk
|
##### Line iteration
|
| 20 |
|
|
|
| 21 |
1635
|
aaronmk
|
class StreamIter(WrapStream):
|
| 22 |
1630
|
aaronmk
|
'''Iterates over the lines in a stream.
|
| 23 |
|
|
Unlike stream.__iter__(), doesn't wait for EOF to start returning lines.
|
| 24 |
|
|
Offers curr() method.
|
| 25 |
|
|
'''
|
| 26 |
|
|
def __init__(self, stream):
|
| 27 |
1635
|
aaronmk
|
WrapStream.__init__(self, stream)
|
| 28 |
1630
|
aaronmk
|
self.line = None
|
| 29 |
|
|
|
| 30 |
|
|
def __iter__(self): return self
|
| 31 |
|
|
|
| 32 |
|
|
def curr(self):
|
| 33 |
1964
|
aaronmk
|
if self.line == None: self.line = self.readline()
|
| 34 |
1630
|
aaronmk
|
if self.line == '': raise StopIteration
|
| 35 |
|
|
return self.line
|
| 36 |
|
|
|
| 37 |
|
|
def next(self):
|
| 38 |
|
|
line = self.curr()
|
| 39 |
|
|
self.line = None
|
| 40 |
|
|
return line
|
| 41 |
1964
|
aaronmk
|
|
| 42 |
|
|
# Define as a separate method so it can be overridden
|
| 43 |
|
|
def readline(self): return self.stream.readline()
|
| 44 |
1635
|
aaronmk
|
|
| 45 |
1686
|
aaronmk
|
def copy(from_, to):
|
| 46 |
|
|
for line in StreamIter(from_): to.write(line)
|
| 47 |
|
|
|
| 48 |
1759
|
aaronmk
|
def consume(in_):
|
| 49 |
|
|
for line in StreamIter(in_): pass
|
| 50 |
|
|
|
| 51 |
4917
|
aaronmk
|
def read_all(stream): return reduce(operator.add, StreamIter(stream), '')
|
| 52 |
|
|
|
| 53 |
13463
|
aaronmk
|
def file_get_contents(file_path): return read_all(open(file_path))
|
| 54 |
|
|
|
| 55 |
1759
|
aaronmk
|
##### Timeouts
|
| 56 |
|
|
|
| 57 |
1635
|
aaronmk
|
class TimeoutInputStream(WrapStream):
|
| 58 |
1673
|
aaronmk
|
'''@param timeout sec'''
|
| 59 |
|
|
def __init__(self, stream, timeout):
|
| 60 |
1635
|
aaronmk
|
WrapStream.__init__(self, stream)
|
| 61 |
1673
|
aaronmk
|
self.timeout = timeout
|
| 62 |
1630
|
aaronmk
|
|
| 63 |
1635
|
aaronmk
|
def readline(self):
|
| 64 |
1673
|
aaronmk
|
return timeouts.run(lambda: self.stream.readline(), self.timeout)
|
| 65 |
1928
|
aaronmk
|
|
| 66 |
|
|
def write(self, str_): raise InputStreamsOnlyException()
|
| 67 |
1630
|
aaronmk
|
|
| 68 |
1710
|
aaronmk
|
##### Filtered/traced streams
|
| 69 |
1686
|
aaronmk
|
|
| 70 |
1962
|
aaronmk
|
class FilterStream(StreamIter):
|
| 71 |
1710
|
aaronmk
|
'''Wraps a stream, filtering each string read or written'''
|
| 72 |
|
|
def __init__(self, filter_, stream):
|
| 73 |
1962
|
aaronmk
|
StreamIter.__init__(self, stream)
|
| 74 |
1710
|
aaronmk
|
self.filter = filter_
|
| 75 |
1630
|
aaronmk
|
|
| 76 |
1964
|
aaronmk
|
def readline(self): return self.filter(StreamIter.readline(self))
|
| 77 |
1682
|
aaronmk
|
|
| 78 |
1762
|
aaronmk
|
def read(self, n): return self.readline() # forward all reads to readline()
|
| 79 |
|
|
|
| 80 |
1710
|
aaronmk
|
def write(self, str_): return self.stream.write(self.filter(str_))
|
| 81 |
1630
|
aaronmk
|
|
| 82 |
1710
|
aaronmk
|
class TracedStream(FilterStream):
|
| 83 |
|
|
'''Wraps a stream, running a trace function on each string read or written
|
| 84 |
|
|
'''
|
| 85 |
|
|
def __init__(self, trace, stream):
|
| 86 |
|
|
def filter_(str_):
|
| 87 |
|
|
trace(str_)
|
| 88 |
|
|
return str_
|
| 89 |
|
|
FilterStream.__init__(self, filter_, stream)
|
| 90 |
|
|
|
| 91 |
1684
|
aaronmk
|
class LineCountStream(TracedStream):
|
| 92 |
|
|
'''Wraps a unidirectional stream, making the current line number available.
|
| 93 |
5592
|
aaronmk
|
Lines start counting from 1, incrementing before each line is returned.'''
|
| 94 |
1630
|
aaronmk
|
def __init__(self, stream):
|
| 95 |
5592
|
aaronmk
|
self.line_num = 0
|
| 96 |
1630
|
aaronmk
|
def trace(str_): self.line_num += str_.count('\n')
|
| 97 |
1682
|
aaronmk
|
TracedStream.__init__(self, trace, stream)
|
| 98 |
|
|
|
| 99 |
1928
|
aaronmk
|
class LineCountInputStream(TracedStream):
|
| 100 |
|
|
'''Wraps an input stream, making the current line number available.
|
| 101 |
5592
|
aaronmk
|
Lines start counting from 1, incrementing before each line is returned.
|
| 102 |
1928
|
aaronmk
|
This is faster than LineCountStream for input streams, because all reading
|
| 103 |
|
|
is done through readline() so newlines don't need to be explicitly counted.
|
| 104 |
|
|
'''
|
| 105 |
|
|
def __init__(self, stream):
|
| 106 |
5592
|
aaronmk
|
self.line_num = 0
|
| 107 |
2672
|
aaronmk
|
def trace(str_):
|
| 108 |
|
|
if str_ != '': self.line_num += 1 # EOF is not a line
|
| 109 |
1928
|
aaronmk
|
TracedStream.__init__(self, trace, stream)
|
| 110 |
|
|
|
| 111 |
|
|
def write(self, str_): raise InputStreamsOnlyException()
|
| 112 |
|
|
|
| 113 |
1939
|
aaronmk
|
class ProgressInputStream(TracedStream):
|
| 114 |
|
|
'''Wraps an input stream, reporting the # lines read every n lines and after
|
| 115 |
|
|
the last line is read.
|
| 116 |
|
|
@param log The output stream for progress messages
|
| 117 |
|
|
'''
|
| 118 |
|
|
def __init__(self, stream, log, msg='Read %d line(s)', n=100):
|
| 119 |
|
|
self.eof = False
|
| 120 |
|
|
|
| 121 |
|
|
def trace(str_):
|
| 122 |
|
|
msg_ = msg # may be modified, so can't have same name as outer var
|
| 123 |
|
|
if str_ == None: # closed
|
| 124 |
|
|
if self.eof: return # not closed prematurely
|
| 125 |
|
|
str_ = '' # closed prematurely, so signal EOF
|
| 126 |
|
|
msg_ += ' (not all input read)'
|
| 127 |
|
|
|
| 128 |
|
|
self.eof = eof = str_ == ''
|
| 129 |
|
|
if eof: line_ending = '\n'
|
| 130 |
|
|
else: line_ending = '\r'
|
| 131 |
|
|
|
| 132 |
5592
|
aaronmk
|
line_ct = self.stream.line_num
|
| 133 |
|
|
if eof or (line_ct > 0 and line_ct % n == 0):
|
| 134 |
|
|
log.write((msg_ % line_ct)+line_ending)
|
| 135 |
1939
|
aaronmk
|
self.trace = trace
|
| 136 |
|
|
|
| 137 |
|
|
TracedStream.__init__(self, trace, LineCountInputStream(stream))
|
| 138 |
|
|
|
| 139 |
|
|
def close(self):
|
| 140 |
|
|
self.trace(None) # signal closed
|
| 141 |
|
|
TracedStream.close(self)
|
| 142 |
|
|
|
| 143 |
1682
|
aaronmk
|
class CaptureStream(TracedStream):
|
| 144 |
|
|
'''Wraps a stream, capturing matching text.
|
| 145 |
1706
|
aaronmk
|
Matches can be retrieved from self.matches.'''
|
| 146 |
1682
|
aaronmk
|
def __init__(self, stream, start_str, end_str):
|
| 147 |
|
|
self.recording = False
|
| 148 |
1706
|
aaronmk
|
self.matches = []
|
| 149 |
1682
|
aaronmk
|
|
| 150 |
|
|
def trace(str_):
|
| 151 |
1707
|
aaronmk
|
start_idx = 0
|
| 152 |
|
|
if not self.recording:
|
| 153 |
|
|
start_idx = str_.find(start_str)
|
| 154 |
|
|
if start_idx >= 0:
|
| 155 |
|
|
self.recording = True
|
| 156 |
|
|
self.matches.append('')
|
| 157 |
|
|
if self.recording:
|
| 158 |
|
|
end_idx = str_.find(end_str)
|
| 159 |
14583
|
aaronmk
|
if end_idx >= 0 and end_idx > start_idx:
|
| 160 |
1707
|
aaronmk
|
self.recording = False
|
| 161 |
|
|
end_idx += len(end_str)
|
| 162 |
|
|
else: end_idx = len(str_)
|
| 163 |
|
|
|
| 164 |
|
|
self.matches[-1] += str_[start_idx:end_idx]
|
| 165 |
1682
|
aaronmk
|
|
| 166 |
|
|
TracedStream.__init__(self, trace, stream)
|
