def _nt_obs_hour
start_index = index
if node_cache[:obs_hour].has_key?(index)
cached = node_cache[:obs_hour][index]
@index = cached.interval.end if cached
return cached
end
i0, s0 = index, []
r2 = _nt_CFWS
if r2
r1 = r2
else
r1 = instantiate_node(SyntaxNode,input, index...index)
end
s0 << r1
if r1
i3, s3 = index, []
r4 = _nt_DIGIT
s3 << r4
if r4
r5 = _nt_DIGIT
s3 << r5
end
if s3.last
r3 = instantiate_node(SyntaxNode,input, i3...index, s3)
r3.extend(ObsHour0)
else
@index = i3
r3 = nil
end
s0 << r3
if r3
r7 = _nt_CFWS
if r7
r6 = r7
else
r6 = instantiate_node(SyntaxNode,input, index...index)
end
s0 << r6
end
end
if s0.last
r0 = instantiate_node(SyntaxNode,input, i0...index, s0)
r0.extend(ObsHour1)
else
@index = i0
r0 = nil
end
node_cache[:obs_hour][start_index] = r0
r0
end