forked from mirrors/gecko-dev
99 lines
3.6 KiB
Python
99 lines
3.6 KiB
Python
#!/usr/bin/env python
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#
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# Copyright 2011, Google Inc.
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# All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions are
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# met:
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#
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# * Redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer.
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# * Redistributions in binary form must reproduce the above
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# copyright notice, this list of conditions and the following disclaimer
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# in the documentation and/or other materials provided with the
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# distribution.
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# * Neither the name of Google Inc. nor the names of its
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# contributors may be used to endorse or promote products derived from
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# this software without specific prior written permission.
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#
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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"""Memorizing file.
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A memorizing file wraps a file and memorizes lines read by readline.
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"""
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import sys
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class MemorizingFile(object):
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"""MemorizingFile wraps a file and memorizes lines read by readline.
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Note that data read by other methods are not memorized. This behavior
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is good enough for memorizing lines SimpleHTTPServer reads before
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the control reaches WebSocketRequestHandler.
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"""
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def __init__(self, file_, max_memorized_lines=sys.maxint):
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"""Construct an instance.
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Args:
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file_: the file object to wrap.
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max_memorized_lines: the maximum number of lines to memorize.
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Only the first max_memorized_lines are memorized.
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Default: sys.maxint.
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"""
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self._file = file_
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self._memorized_lines = []
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self._max_memorized_lines = max_memorized_lines
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self._buffered = False
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self._buffered_line = None
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def __getattribute__(self, name):
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if name in ('_file', '_memorized_lines', '_max_memorized_lines',
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'_buffered', '_buffered_line', 'readline',
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'get_memorized_lines'):
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return object.__getattribute__(self, name)
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return self._file.__getattribute__(name)
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def readline(self, size=-1):
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"""Override file.readline and memorize the line read.
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Note that even if size is specified and smaller than actual size,
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the whole line will be read out from underlying file object by
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subsequent readline calls.
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"""
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if self._buffered:
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line = self._buffered_line
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self._buffered = False
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else:
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line = self._file.readline()
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if line and len(self._memorized_lines) < self._max_memorized_lines:
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self._memorized_lines.append(line)
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if size >= 0 and size < len(line):
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self._buffered = True
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self._buffered_line = line[size:]
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return line[:size]
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return line
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def get_memorized_lines(self):
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"""Get lines memorized so far."""
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return self._memorized_lines
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# vi:sts=4 sw=4 et
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