def readstream(self, stream):
""" Reads the specified stream and parses the token elements generated
from tokenizing the input data.
`stream`
``File``-like object.
Returns boolean.
"""
self._reset()
try:
# tokenize input stream
self._lexer = SettingLexer()
self._lexer.readstream(stream)
# parse tokens into AST
self._parse()
return True
except IOError:
self._reset()
return False
