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DariusIII
151 lines
3.4 KiB
Python
151 lines
3.4 KiB
Python
#!/usr/bin/python
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"""
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A reasonably efficient FIFO buffer.
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Copyright (C) 2013 Byron Platt
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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"""
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#NOTE: docstrings beed to be added
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_DISCARD_SIZE = 0xffff
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class Fifo(object):
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def __init__(self, data="", eol="\r\n"):
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self.buf = data
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self.eol = eol
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self.buflist = []
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self.pos = 0
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def __len__(self):
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return len(self.buf) - self.pos
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def __iter__(self):
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return self
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def __discard(self):
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if self.pos > _DISCARD_SIZE:
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self.buf = self.buf[self.pos:]
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self.pos = 0
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def __append(self):
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self.buf += "".join(self.buflist)
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self.buflist = []
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def clear(self):
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self.buf = ""
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self.buflist = []
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self.pos = 0
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def write(self, data):
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self.buflist.append(data)
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def read(self, length=0):
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self.__append()
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if 0 < length < len(self):
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newpos = self.pos + length
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data = self.buf[self.pos:newpos]
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self.pos = newpos
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self.__discard()
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return data
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data = self.buf[self.pos:]
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self.clear()
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return data
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def readline(self):
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self.__append()
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i = self.buf.find(self.eol, self.pos)
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if i < 0:
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return ""
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newpos = i + len(self.eol)
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data = self.buf[self.pos:newpos]
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self.pos = newpos
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self.__discard()
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return data
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def readuntil(self, token, size=0):
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self.__append()
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i = self.buf.find(token, self.pos)
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if i < 0:
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index = max(len(token) - 1, size)
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newpos = max(len(self.buf) - index, self.pos)
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data = self.buf[self.pos:newpos]
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self.pos = newpos
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self.__discard()
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return False, data
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newpos = i + len(token)
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data = self.buf[self.pos:newpos]
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self.pos = newpos
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self.__discard()
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return True, data
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def peek(self, length=0):
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self.__append()
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if 0 < length < len(self):
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newpos = self.pos + length
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return self.buf[self.pos:newpos]
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return self.buf[self.pos:]
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def peekline(self):
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self.__append()
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i = self.buf.find(self.eol, self.pos)
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if i < 0:
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return ""
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newpos = i + len(self.eol)
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return self.buf[self.pos:newpos]
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def peekuntil(self, token, size=0):
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self.__append()
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i = self.buf.find(token, self.pos)
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if i < 0:
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index = max(len(token) - 1, size)
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newpos = max(len(self.buf) - index, self.pos)
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return False, self.buf[self.pos:newpos]
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newpos = i + len(token)
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return True, self.buf[self.pos:newpos]
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def next(self):
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line = self.readline()
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if not line:
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raise StopIteration()
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return line
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