2 files changed, 82 insertions, 27 deletions

diff --git a/src/core/parser/ParserStack.cpp b/src/core/parser/ParserStack.cpp
index 691b9d0..caf2116 100644
--- a/src/core/parser/ParserStack.cpp
+++ b/src/core/parser/ParserStack.cpp
@@ -26,13 +26,30 @@
 namespace ousia {
 namespace parser {
 
+/* A default handler */
+
+class DefaultHandler : public Handler {
+public:
+	using Handler::Handler;
+
+	void start(Variant::mapType &args) override {}
+
+	void end() override {}
+};
+
+static Handler *createDefaultHandler(const HandlerData &handlerData)
+{
+	return new DefaultHandler{handlerData};
+}
+
 /* Class Handler */
 
 void Handler::data(const std::string &data, int field)
 {
 	for (auto &c : data) {
 		if (!Utils::isWhitespace(c)) {
-			throw LoggableException{"No data allowed here."};
+			logger().error("Expected command but found character data.");
+			return;
 		}
 	}
 }
@@ -49,7 +66,13 @@ HandlerInstance HandlerDescriptor::create(const ParserContext &ctx,
                                           bool isChild,
                                           Variant::mapType &args) const
 {
-	Handler *h = ctor(ctx, name, targetState, parentState, isChild);
+	Handler *h;
+	HandlerData data{ctx, name, targetState, parentState, isChild};
+	if (ctor) {
+		h = ctor(data);
+	} else {
+		h = createDefaultHandler(data);
+	}
 
 	// Canonicalize the arguments
 	arguments.validateMap(args, ctx.logger, true);
@@ -120,7 +143,8 @@ void ParserStack::start(std::string name, Variant::mapType &args)
 	}
 
 	// Instantiate the handler and call its start function
-	stack.emplace(descr->create(ctx, name, curState, isChild, args));
+	stack.emplace(
+	    descr->create(ctx, name, curState, isChild, args));
 }
 
 void ParserStack::start(std::string name, const Variant::mapType &args)
diff --git a/src/core/parser/ParserStack.hpp b/src/core/parser/ParserStack.hpp
index d9de39e..43d6529 100644
--- a/src/core/parser/ParserStack.hpp
+++ b/src/core/parser/ParserStack.hpp
@@ -55,15 +55,9 @@ static const State STATE_ALL = -2;
 static const State STATE_NONE = -1;
 
 /**
- * The handler class provides a context for handling an XML tag. It has to be
- * overridden and registered in the StateStack class to form handlers for
- * concrete XML tags.
+ * Struct collecting all the data that is being passed to a Handler instance.
  */
-class Handler {
-private:
-	Rooted<Node> node;
-
-public:
+struct HandlerData {
 	/**
 	 * Reference to the ParserContext instance that should be used to resolve
 	 * references to nodes in the Graph.
@@ -92,7 +86,7 @@ public:
 	const bool isChild;
 
 	/**
-	 * Constructor of the Handler class.
+	 * Constructor of the HandlerData class.
 	 *
 	 * @param ctx is the parser context the handler should be executed in.
 	 * @param name is the name of the string.
@@ -101,26 +95,57 @@ public:
 	 * @param isChild specifies whether this handler was called not for the
 	 * command that was specified in the state machine but a child command.
 	 */
-	Handler(const ParserContext &ctx, std::string name, State state,
-	        State parentState, bool isChild)
+	HandlerData(const ParserContext &ctx, std::string name, State state,
+	            State parentState, bool isChild)
 	    : ctx(ctx),
 	      name(std::move(name)),
 	      state(state),
 	      parentState(parentState),
 	      isChild(isChild){};
+};
 
+/**
+ * The handler class provides a context for handling an XML tag. It has to be
+ * overridden and registered in the StateStack class to form handlers for
+ * concrete XML tags.
+ */
+class Handler {
+private:
 	/**
-	 * Virtual destructor.
+	 * Structure containing the internal handler data.
 	 */
-	virtual ~Handler(){};
+	const HandlerData handlerData;
 
+public:
 	/**
-	 * Returns the node instance that was created by the handler.
+	 * Constructor of the Handler class.
 	 *
-	 * @return the Node instance created by the handler. May be nullptr if no
-	 * Node was created.
+	 * @param data is a structure containing all data being passed to the
+	 * handler.
 	 */
-	Rooted<Node> getNode() { return node; }
+	Handler(const HandlerData &handlerData) : handlerData(handlerData) {};
+
+	/**
+	 * Virtual destructor.
+	 */
+	virtual ~Handler(){};
+
+	
+	const std::string& name() {return handlerData.name;}
+
+	Scope &scope() {return handlerData.ctx.scope;}
+
+	Registry &registry() {return handlerData.ctx.registry;}
+
+	Manager &manager() { return handlerData.ctx.manager; }
+
+	Logger &logger() { return handlerData.ctx.logger; }
+
+	State state() {return handlerData.state; }
+
+	State parentState() { return handlerData.parentState; }
+
+	bool isChild() { return handlerData.isChild; }
 
 	/**
 	 * Called when the command that was specified in the constructor is
@@ -128,7 +153,7 @@ public:
 	 *
 	 * @param args is a map from strings to variants (argument name and value).
 	 */
-	virtual void start(const Variant::mapType &args) = 0;
+	virtual void start(Variant::mapType &args) = 0;
 
 	/**
 	 * Called whenever the command for which this handler is defined ends.
@@ -158,10 +183,12 @@ public:
 /**
  * HandlerConstructor is a function pointer type used to create concrete
  * instances of the Handler class.
+ *
+ * @param handlerData is the data that should be passed to the new handler
+ * instance.
+ * @return a newly created handler instance.
  */
-using HandlerConstructor = Handler *(*)(const ParserContext &ctx,
-                                        std::string name, State state,
-                                        State parentState, bool isChild);
+using HandlerConstructor = Handler *(*)(const HandlerData &handlerData);
 
 struct HandlerDescriptor;
 
@@ -177,6 +204,10 @@ struct HandlerInstance {
 	 */
 	std::shared_ptr<Handler> handler;
 
+	/**
+	 * Pointer pointing at the descriptor from which the handler instance was
+	 * derived.
+	 */
 	const HandlerDescriptor *descr;
 
 	HandlerInstance(Handler *handler, const HandlerDescriptor *descr)
@@ -309,7 +340,7 @@ public:
 	 */
 	State currentState()
 	{
-		return stack.empty() ? STATE_NONE : stack.top().handler->state;
+		return stack.empty() ? STATE_NONE : stack.top().handler->state();
 	}
 
 	/**
@@ -320,7 +351,7 @@ public:
 	 */
 	std::string currentName()
 	{
-		return stack.empty() ? std::string{} : stack.top().handler->name;
+		return stack.empty() ? std::string{} : stack.top().handler->name();
 	}
 
 	/**
@@ -370,7 +401,7 @@ public:
 	 *
 	 * @return a reference to the parser context.
 	 */
-	ParserContext& getContext() {return ctx;}
+	ParserContext &getContext() { return ctx; }
 };
 }
 }