def _nt_encoding
start_index = index
if node_cache[:encoding].has_key?(index)
cached = node_cache[:encoding][index]
if cached
cached = SyntaxNode.new(input, index...(index + 1)) if cached == true
@index = cached.interval.end
end
return cached
end
i0 = index
i1, s1 = index, []
r2 = _nt_ietf_token
s1 << r2
if r2
if has_terminal?("s", false, index)
r4 = instantiate_node(SyntaxNode,input, index...(index + 1))
@index += 1
else
terminal_parse_failure("s")
r4 = nil
end
if r4
r3 = r4
else
r3 = instantiate_node(SyntaxNode,input, index...index)
end
s1 << r3
end
if s1.last
r1 = instantiate_node(SyntaxNode,input, i1...index, s1)
r1.extend(Encoding0)
r1.extend(Encoding1)
else
@index = i1
r1 = nil
end
if r1
r0 = r1
else
r5 = _nt_custom_x_token
if r5
r0 = r5
else
@index = i0
r0 = nil
end
end
node_cache[:encoding][start_index] = r0
r0
end