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# File 'lib/music-transcription/parsing/numbers/positive_integer_parsing.rb', line 31
def _nt_positive_integer
start_index = index
if node_cache[:positive_integer].has_key?(index)
cached = node_cache[:positive_integer][index]
if cached
node_cache[:positive_integer][index] = cached = SyntaxNode.new(input, index...(index + 1)) if cached == true
@index = cached.interval.end
end
return cached
end
i0, s0 = index, []
s1, i1 = [], index
loop do
if has_terminal?(@regexps[gr = '\A[0]'] ||= Regexp.new(gr), :regexp, index)
r2 = true
@index += 1
else
terminal_parse_failure('[0]')
r2 = nil
end
if r2
s1 << r2
else
break
end
end
r1 = instantiate_node(SyntaxNode,input, i1...index, s1)
s0 << r1
if r1
if has_terminal?(@regexps[gr = '\A[1-9]'] ||= Regexp.new(gr), :regexp, index)
r3 = true
@index += 1
else
terminal_parse_failure('[1-9]')
r3 = nil
end
s0 << r3
if r3
r4 = _nt_nonnegative_integer
s0 << r4
end
end
if s0.last
r0 = instantiate_node(SyntaxNode,input, i0...index, s0)
r0.extend(PositiveInteger0)
r0.extend(PositiveInteger1)
else
@index = i0
r0 = nil
end
node_cache[:positive_integer][start_index] = r0
r0
end
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