def _nt_parenthesized_expression
start_index = index
if node_cache[:parenthesized_expression].has_key?(index)
cached = node_cache[:parenthesized_expression][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?('(', false, index)
r1 = instantiate_node(SyntaxNode,input, index...(index + 1))
@index += 1
else
terminal_parse_failure('(')
r1 = nil
end
s0 << r1
if r1
r3 = _nt_space
if r3
r2 = r3
else
r2 = instantiate_node(SyntaxNode,input, index...index)
end
s0 << r2
if r2
r4 = _nt_parsing_expression
s0 << r4
if r4
r6 = _nt_space
if r6
r5 = r6
else
r5 = instantiate_node(SyntaxNode,input, index...index)
end
s0 << r5
if r5
if has_terminal?(')', false, index)
r7 = instantiate_node(SyntaxNode,input, index...(index + 1))
@index += 1
else
terminal_parse_failure(')')
r7 = nil
end
s0 << r7
end
end
end
end
if s0.last
r0 = instantiate_node(ParenthesizedExpression,input, i0...index, s0)
r0.extend(ParenthesizedExpression0)
r0.extend(ParenthesizedExpression1)
else
@index = i0
r0 = nil
end
node_cache[:parenthesized_expression][start_index] = r0
r0
end