def _nt_comment
start_index = index
if node_cache[:comment].has_key?(index)
cached = node_cache[:comment][index]
@index = cached.interval.end if cached
return cached
end
s0, i0 = [], index
loop do
i1, s1 = index, []
r2 = _nt_comment_line
s1 << r2
if r2
r3 = _nt_white
s1 << r3
end
if s1.last
r1 = instantiate_node(SyntaxNode,input, i1...index, s1)
r1.extend(Comment0)
else
@index = i1
r1 = nil
end
if r1
s0 << r1
else
break
end
end
r0 = instantiate_node(SyntaxNode,input, i0...index, s0)
r0.extend(Comment1)
node_cache[:comment][start_index] = r0
r0
end