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# A TokenStream is a list of tokens, gathered during the parse
# of some entity (say a method). Entities populate these streams
# by being registered with the lexer. Any class can collect tokens
# by including TokenStream. From the outside, you use such an object
# by calling the start_collecting_tokens method, followed by calls
# to add_token and pop_token
module TokenStream
def token_stream
@token_stream
end
def start_collecting_tokens
@token_stream = []
end
def add_token(tk)
@token_stream << tk
end
def add_tokens(tks)
tks.each {|tk| add_token(tk)}
end
def pop_token
@token_stream.pop
end
end