C++ xml_node::attributes方法代码示例

void getNodeAttr(string& result, const xml_node &node, const string& attrName) {
  result = "";
  for (auto attr: node.attributes()) {
    if (attr.name() == attrName) {
      result = attr.value();
      break;
    }
  }
}

	void Setting::LoadFromXml(xml_node& node) {
		name = node.attribute("name").as_string("");

		for (auto itemNode : node.children("item")) {
			
			SettingItem item = SettingItem();
			item.key = itemNode.attribute("key").as_string("");

			auto value = itemNode.attribute("value");

			if (value) {
				// single string  <item key="abc" value="def" />
				item.AddValues(value.as_string(""));
			}
			else {
				/* more xml elements:
				<item key="abc">
				<value>val1</value>
				<value>val2</value>
				</item>
				*/
				for (auto valueNode : itemNode.children("value")) {
					string val = valueNode.value();
					item.AddValues(val);
				}
			}

			items[item.key] = item;
		}

		// items may be declared as attributes, e.g. <setting name="myset" key1="value1" key2="value2" />
		for (auto attrNode : node.attributes()) {
			auto attrName = attrNode.name();
			if (string(attrName).compare("name") != 0) {
				string val = attrNode.value();
				items[attrName] = SettingItem(attrName, val);
			}
		}
	}

bool Action::initialise(const xml_node& node)
{
	// The result of the initialisation
	bool result = true;

	// Set the path
	mPath = xvnu::path(node);

	// Get the action name
	string action = node.name();
	// Iterate over all valid action strings
	bool action_is_valid = false;
	for(string str : ACTIONS)
	{
		// If it is a valid action, set the flag true and break from the loop
		if(str == action)
		{
			action_is_valid = true;
			break;
		}
	}

	// If the boolean flag is still in a false state, no match was found. Report error and set results flag false.
	if(action_is_valid == false)
	{
		cout << "[email protected]" << mPath << " - \"" << action << "\" is not a valid action" << endl;
		result = false;
	}

	// Set the action
	mAction = action;

	// If the node has an attribute for the first variable, set it
	if(node.attribute("variable"))
		mVariableName = node.attribute("variable").as_string();
	// If it does not contain this attribute, report the error and set the result flag to false
	else
	{
		cout << "[email protected]" << mPath << " - \"variable\" attribute not found" << endl;
		result = false;
	}

	// Iterate over all attributes to find the second effector attribute
	for(auto& attribute : node.attributes())
	{
		// Get the attributes name
		string attribute_name = attribute.name();

		// Only consider attributes with names starting with "as", "to" or "by" as effector attributes.
		if(attribute_name.substr(0,2) == "as" || attribute_name.substr(0,2) == "to" || attribute_name.substr(0,2) == "by")
		{
			// If the end of the attributes name is "_variable", the attribute value is the effector variables name
			if(attribute_name.rfind("_") != string::npos && attribute_name.substr(attribute_name.rfind("_")) == "_variable")
				mEffectorVariableName = attribute.value();
			// Else the attribute value is the effector's literal value i.e. "123"
			else
				mEffectorVariableValue = attribute.value();
			break;
		}
	}

	// If both effector strings are empty, no suitable attribute was found. Report the error and set the result flag to false.
	if(mEffectorVariableValue.empty() && mEffectorVariableName.empty())
	{
		cout << "[email protected]" << mPath << " - no valid effector attribute found" << endl;
		result = false;
	}

	// Return the result of the initialise
	return result;
}