def _nt_quoted_pair
start_index = index
if node_cache[:quoted_pair].has_key?(index)
cached = node_cache[:quoted_pair][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, []
if has_terminal?("\\", false, index)
r2 = instantiate_node(SyntaxNode,input, index...(index + 1))
@index += 1
else
terminal_parse_failure("\\")
r2 = nil
end
s1 << r2
if r2
r3 = _nt_text
s1 << r3
end
if s1.last
r1 = instantiate_node(SyntaxNode,input, i1...index, s1)
r1.extend(QuotedPair0)
else
@index = i1
r1 = nil
end
if r1
r0 = r1
else
r4 = _nt_obs_qp
if r4
r0 = r4
else
@index = i0
r0 = nil
end
end
node_cache[:quoted_pair][start_index] = r0
r0
end