def _nt_choice
start_index = index
if node_cache[:choice].has_key?(index)
cached = node_cache[:choice][index]
@index = cached.interval.end if cached
return cached
end
i0, s0 = index, []
r1 = _nt_alternative
s0 << r1
if r1
s2, i2 = [], index
loop do
i3, s3 = index, []
r5 = _nt_space
if r5
r4 = r5
else
r4 = instantiate_node(SyntaxNode,input, index...index)
end
s3 << r4
if r4
if input.index('/', index) == index
r6 = instantiate_node(SyntaxNode,input, index...(index + 1))
@index += 1
else
terminal_parse_failure('/')
r6 = nil
end
s3 << r6
if r6
r8 = _nt_space
if r8
r7 = r8
else
r7 = instantiate_node(SyntaxNode,input, index...index)
end
s3 << r7
if r7
r9 = _nt_alternative
s3 << r9
end
end
end
if s3.last
r3 = instantiate_node(SyntaxNode,input, i3...index, s3)
r3.extend(Choice0)
else
self.index = i3
r3 = nil
end
if r3
s2 << r3
else
break
end
end
if s2.empty?
self.index = i2
r2 = nil
else
r2 = instantiate_node(SyntaxNode,input, i2...index, s2)
end
s0 << r2
end
if s0.last
r0 = instantiate_node(Choice,input, i0...index, s0)
r0.extend(Choice1)
r0.extend(Choice2)
else
self.index = i0
r0 = nil
end
node_cache[:choice][start_index] = r0
return r0
end