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try:
# pylint: disable=used-before-assignment
basestring = basestring
except NameError: # py3
basestring = str
from .nmea import NMEASentence
class NMEAFile(object):
"""
Reads NMEA sentences from a file similar to a standard python file object.
"""
def __init__(self, f, *args, **kwargs):
super(NMEAFile, self).__init__()
if isinstance(f, basestring) or args or kwargs:
self._file = self.open(f, *args, **kwargs)
else:
self._file = f
self._context = None
def open(self, fp, mode='r'):
"""
Open the NMEAFile.
"""
self._file = open(fp, mode=mode)
return self._file
def close(self):
"""
Close the NMEAFile.
"""
self._file.close()
def __iter__(self):
"""
Iterate through the file yielding NMEASentences
:return:
"""
for line in self._file:
yield self.parse(line)
def __enter__(self):
if hasattr(self._file, '__enter__'):
self._context = self._file.__enter__()
return self
def __exit__(self, exc_type, exc_val, exc_tb):
if self._context:
ctx = self._context
self._context = None
ctx.__exit__(exc_type, exc_val, exc_tb)
def next(self):
"""
Iterate through the file object returning NMEASentence objects
:return: NMEASentence
"""
data = self._file.readline()
return self.parse(data)
def parse(self, s):
return NMEASentence.parse(s)
def readline(self):
"""
Return the next NMEASentence in the file object
:return: NMEASentence
"""
data = self._file.readline()
s = self.parse(data)
return s
def read(self):
"""
Return a list of NMEASentence objects for each line in the file
:return: list of NMEASentence objects
"""
return [s for s in self]
|
