def _nt_background
start_index = index
if node_cache[:background].has_key?(index)
cached = node_cache[:background][index]
@index = cached.interval.end if cached
return cached
end
i0, s0 = index, []
r1 = _nt_comment
s0 << r1
if r1
r2 = _nt_white
s0 << r2
if r2
r3 = _nt_background_keyword
s0 << r3
if r3
s4, i4 = [], index
loop do
r5 = _nt_space
if r5
s4 << r5
else
break
end
end
r4 = instantiate_node(SyntaxNode,input, i4...index, s4)
s0 << r4
if r4
r7 = _nt_lines_to_keyword
if r7
r6 = r7
else
r6 = instantiate_node(SyntaxNode,input, index...index)
end
s0 << r6
if r6
i8 = index
s9, i9 = [], index
loop do
r10 = _nt_eol
if r10
s9 << r10
else
break
end
end
if s9.empty?
@index = i9
r9 = nil
else
r9 = instantiate_node(SyntaxNode,input, i9...index, s9)
end
if r9
r8 = r9
else
r11 = _nt_eof
if r11
r8 = r11
else
@index = i8
r8 = nil
end
end
s0 << r8
if r8
r12 = _nt_steps
s0 << r12
end
end
end
end
end
end
if s0.last
r0 = instantiate_node(SyntaxNode,input, i0...index, s0)
r0.extend(Background0)
r0.extend(Background1)
else
@index = i0
r0 = nil
end
node_cache[:background][start_index] = r0
r0
end