def _nt_zone
start_index = index
if node_cache[:zone].has_key?(index)
cached = node_cache[:zone][index]
@index = cached.interval.end if cached
return cached
end
i0 = index
i1, s1 = index, []
i2 = index
if has_terminal?("+", false, index)
r3 = instantiate_node(SyntaxNode,input, index...(index + 1))
@index += 1
else
terminal_parse_failure("+")
r3 = nil
end
if r3
r2 = r3
else
if has_terminal?("-", false, index)
r4 = instantiate_node(SyntaxNode,input, index...(index + 1))
@index += 1
else
terminal_parse_failure("-")
r4 = nil
end
if r4
r2 = r4
else
@index = i2
r2 = nil
end
end
s1 << r2
if r2
r5 = _nt_DIGIT
s1 << r5
if r5
r6 = _nt_DIGIT
s1 << r6
if r6
r7 = _nt_DIGIT
s1 << r7
if r7
r8 = _nt_DIGIT
s1 << r8
end
end
end
end
if s1.last
r1 = instantiate_node(SyntaxNode,input, i1...index, s1)
r1.extend(Zone0)
else
@index = i1
r1 = nil
end
if r1
r0 = r1
else
r9 = _nt_obs_zone
if r9
r0 = r9
else
@index = i0
r0 = nil
end
end
node_cache[:zone][start_index] = r0
r0
end