eof?()
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gets()
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def gets
if l = readline(@prompt, false)
HISTORY.push(l) if !l.empty?
@line[@line_no += 1] = l + "\n"
else
@eof = true
l
end
end
line(line_no)
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def line(line_no)
@line[line_no]
end
readable_atfer_eof?()
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def readable_atfer_eof?
true
end