def _nt_alphanumeric_char
start_index = index
if node_cache[:alphanumeric_char].has_key?(index)
cached = node_cache[:alphanumeric_char][index]
if cached
cached = SyntaxNode.new(input, index...(index + 1)) if cached == true
@index = cached.interval.end
end
return cached
end
i0 = index
r1 = _nt_alpha_char
if r1
r0 = r1
else
if has_terminal?('\G[0-9]', true, index)
r2 = true
@index += 1
else
r2 = nil
end
if r2
r0 = r2
else
@index = i0
r0 = nil
end
end
node_cache[:alphanumeric_char][start_index] = r0
r0
end