Method eval_number

UnitTests/TestApp/pugixml.cpp:8947–9067

	}

	double eval_number(const xpath_context& c, const xpath_stack& stack)
	{
		switch (_type)
		{
		case ast_op_add: return _left->eval_number(c, stack) + _right->eval_number(c, stack);

		case ast_op_subtract: return _left->eval_number(c, stack) - _right->eval_number(c, stack);

		case ast_op_multiply: return _left->eval_number(c, stack) * _right->eval_number(c, stack);

		case ast_op_divide: return _left->eval_number(c, stack) / _right->eval_number(c, stack);

		case ast_op_mod: return fmod(_left->eval_number(c, stack), _right->eval_number(c, stack));

		case ast_op_negate: return -_left->eval_number(c, stack);

		case ast_number_constant: return _data.number;

		case ast_func_last: return static_cast<double>(c.size);

		case ast_func_position: return static_cast<double>(c.position);

		case ast_func_count:
		{
			xpath_allocator_capture cr(stack.result);

			return static_cast<double>(_left->eval_node_set(c, stack).size());
		}

		case ast_func_string_length_0:
		{
			xpath_allocator_capture cr(stack.result);

			return static_cast<double>(string_value(c.n, stack.result).length());
		}

		case ast_func_string_length_1:
		{
			xpath_allocator_capture cr(stack.result);

			return static_cast<double>(_left->eval_string(c, stack).length());
		}

		case ast_func_number_0:
		{
			xpath_allocator_capture cr(stack.result);

			return convert_string_to_number(string_value(c.n, stack.result).c_str());
		}

		case ast_func_number_1: return _left->eval_number(c, stack);

		case ast_func_sum:
		{
			xpath_allocator_capture cr(stack.result);

			double r = 0;