mirror of
https://github.com/oliverschmidt/contiki.git
synced 2024-11-08 23:08:29 +00:00
66 lines
2.0 KiB
Python
66 lines
2.0 KiB
Python
|
|
class SerialException(Exception):
|
|
pass
|
|
|
|
class FileLike:
|
|
"""An abstract file like class.
|
|
|
|
This class implements readline and readlines based on read and
|
|
writelines based on write.
|
|
This class is used to provide the above functions for to Serial
|
|
port objects.
|
|
|
|
Note that when the serial port was opened with _NO_ timeout that
|
|
readline blocks until it sees a newline (or the specified size is
|
|
reached) and that readlines would never return and therefore
|
|
refuses to work (it raises an exception in this case)!
|
|
"""
|
|
|
|
def read(self, size): raise NotImplementedError
|
|
def write(self, s): raise NotImplementedError
|
|
|
|
def readline(self, size=None, eol='\n'):
|
|
"""read a line which is terminated with end-of-line (eol) character
|
|
('\n' by default) or until timeout"""
|
|
line = ''
|
|
while 1:
|
|
c = self.read(1)
|
|
if c:
|
|
line += c #not very efficient but lines are usually not that long
|
|
if c == eol:
|
|
break
|
|
if size is not None and len(line) >= size:
|
|
break
|
|
else:
|
|
break
|
|
return line
|
|
|
|
def readlines(self, sizehint=None, eol='\n'):
|
|
"""read a list of lines, until timeout
|
|
sizehint is ignored"""
|
|
if self.timeout is None:
|
|
raise ValueError, "Serial port MUST have enabled timeout for this function!"
|
|
lines = []
|
|
while 1:
|
|
line = self.readline(eol=eol)
|
|
if line:
|
|
lines.append(line)
|
|
if line[-1] != eol: #was the line received with a timeout?
|
|
break
|
|
else:
|
|
break
|
|
return lines
|
|
|
|
def xreadlines(self, sizehint=None):
|
|
"""just call readlines - here for compatibility"""
|
|
return self.readlines()
|
|
|
|
def writelines(self, sequence):
|
|
for line in sequence:
|
|
self.write(line)
|
|
|
|
def flush(self):
|
|
"""flush of file like objects"""
|
|
pass
|
|
|