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# File 'lib/brevity/parsing/note/pitch.rb', line 16
def _nt_pitch
start_index = index
if node_cache[:pitch].has_key?(index)
cached = node_cache[:pitch][index]
if cached
node_cache[:pitch][index] = cached = SyntaxNode.new(input, index...(index + 1)) if cached == true
@index = cached.interval.end
end
return cached
end
i0, s0 = index, []
if has_terminal?(@regexps[gr = '\A[A-Ga-g]'] ||= Regexp.new(gr), :regexp, index)
r1 = true
@index += 1
else
terminal_parse_failure('[A-Ga-g]')
r1 = nil
end
s0 << r1
if r1
if has_terminal?(@regexps[gr = '\A[#b]'] ||= Regexp.new(gr), :regexp, index)
r3 = true
@index += 1
else
terminal_parse_failure('[#b]')
r3 = nil
end
if r3
r2 = r3
else
r2 = instantiate_node(SyntaxNode,input, index...index)
end
s0 << r2
if r2
if has_terminal?(@regexps[gr = '\A[0-9]'] ||= Regexp.new(gr), :regexp, index)
r4 = true
@index += 1
else
terminal_parse_failure('[0-9]')
r4 = nil
end
s0 << r4
end
end
if s0.last
r0 = instantiate_node(PitchNode,input, i0...index, s0)
r0.extend(Pitch0)
else
@index = i0
r0 = nil
end
node_cache[:pitch][start_index] = r0
r0
end
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