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import logging
# Handle efficient operations on a non-fixed length buffer like appending,
# replacing, reading chunks, etc
class ChunkBuffer:
def __init__( self, data = '' ):
logging.debug( "Creating chunkbuffer: %s" % data )
self.l = len( data )
self.chunk = [ data ]
def append( self, s ):
self.l += len( s )
self.chunk.append( s )
# Note: replace doesn't effect length so we don't update it
def replace( self, buf, start, end ):
# We make a string of our chunk, then create a new list of the 3
# strings, the start, new chunk, and remaining chunk
s = ''.join( self.chunk )
l = end - start
self.chunk = [ s[ :start ], buf[ :l ], s[ end: ] ]
def length( self ):
return self.l
def truncate( self, l ):
s = ''.join( self.chunk )
self.l = l
self.chunk = [ s[ :l ] ]
def _simplify( self ):
logging.debug( "Simplify!" )
self.chunk = [ ''.join( self.chunk ) ]
def string(self):
logging.debug( "Stringifying: %s" % self.chunk )
return ''.join( self.chunk )
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