def _nt_obs_subject
start_index = index
if node_cache[:obs_subject].has_key?(index)
cached = node_cache[:obs_subject][index]
if cached
cached = SyntaxNode.new(input, index...(index + 1)) if cached == true
@index = cached.interval.end
end
return cached
end
i0, s0 = index, []
if has_terminal?("Subject", false, index)
r1 = instantiate_node(SyntaxNode,input, index...(index + 7))
@index += 7
else
terminal_parse_failure("Subject")
r1 = nil
end
s0 << r1
if r1
s2, i2 = [], index
loop do
r3 = _nt_WSP
if r3
s2 << r3
else
break
end
end
r2 = instantiate_node(SyntaxNode,input, i2...index, s2)
s0 << r2
if r2
if has_terminal?(":", false, index)
r4 = instantiate_node(SyntaxNode,input, index...(index + 1))
@index += 1
else
terminal_parse_failure(":")
r4 = nil
end
s0 << r4
if r4
r5 = _nt_unstructured
s0 << r5
if r5
r6 = _nt_CRLF
s0 << r6
end
end
end
end
if s0.last
r0 = instantiate_node(SyntaxNode,input, i0...index, s0)
r0.extend(ObsSubject0)
else
@index = i0
r0 = nil
end
node_cache[:obs_subject][start_index] = r0
r0
end