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class LazyParser(object):
"""Parse commands and extract information"""
def __init__(self, line):
self.line = line
self._chunks = None
self._rests = None
self._rests_loaded = 0
self._rests_gen_instance = None
try:
self.firstpart = line[:line.rindex(' ') + 1]
except ValueError:
self.firstpart = ''
def chunk(self, n, otherwise=''):
"""Chunks are pieces of the command seperated by spaces"""
if self._chunks is None:
self._chunks = line.split()
if len(self._chunks) > n:
return self._chunks[n]
else:
return otherwise
def rest(self, n, otherwise=''):
"""Rests are the strings which come after each word."""
if self._rests is None:
self._rests = list(self._rest_generator())
# TODO: Don't calculate all the rest elements if not needed
if len(self._rests) > n:
return self._rests[n]
else:
return otherwise
def _rest_generator(self):
lastrest = self.line
n = 0
while n < len(lastrest):
if lastrest[n] == ' ':
n += 1
else:
yield lastrest[n:]
n = lastrest.find(' ', n) + 1
if n <= 0:
break
lastrest = lastrest[n:]
n = 0
def __add__(self, newpart):
return self.firstpart + newpart
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