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module Mpeg
class Input
def initialize(string)
@scanner = StringScanner.new(string)
end
def matches?(pattern)
@scanner.match?(pattern)
end
def consume(characters)
position = @scanner.pos
slice = @scanner.scan(/(.|$){#{characters}}/m)
Slice.new(position, slice)
end
def rewind
transaction do |_|
yield
end
end
def transaction(&block)
Transaction.new(@scanner).run(&block)
end
def end_of_string?
@scanner.eos?
end
def position
@scanner.pos
end
end
end
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