4 // Fraunhofer Institute for Open Communication Systems (FOKUS)
5 // Competence Center NETwork research (NET), St. Augustin, GERMANY
6 // Stefan Bund <g0dil@berlios.de>
8 // This program is free software; you can redistribute it and/or modify
9 // it under the terms of the GNU General Public License as published by
10 // the Free Software Foundation; either version 2 of the License, or
11 // (at your option) any later version.
13 // This program is distributed in the hope that it will be useful,
14 // but WITHOUT ANY WARRANTY; without even the implied warranty of
15 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 // GNU General Public License for more details.
18 // You should have received a copy of the GNU General Public License
19 // along with this program; if not, write to the
20 // Free Software Foundation, Inc.,
21 // 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
24 \brief Node public header */
26 /** \defgroup node_tree The console/config file-system node tree
28 The console/config node tree is the central data-structure of the library. Into this tree, all
29 commands and parameters are entered. The tree is then exposed using a file-system like
34 \section console_tree The tree
36 We will start by giving a more complete example. This example contains most of the stuff needed
37 for using the console/config library.
40 // Define callback function.
41 void mycommand(std::ostream & os, senf::console::ParseCommandInfo const & command)
44 os << "!! Important message ...\n";
50 // Declare a directory node (proxy) for use by this class. This must be public so we can add
51 // it to the node tree later.
52 senf::console::ScopedDirectory<SomeClass> dir;
54 SomeClass() : dir(this)
56 // You may document the directory here or later when adding it to the tree
57 dir.doc("Manager for something");
59 // Add a member function (the pointer-to-member is automatically bound to this instance)
60 dir.add("member", &SomeClass::member)
61 .doc("Do the member operation");
64 void member(std::ostream & os, senf::console::ParseCommandInfo const & command)
72 // Provide global documentation
74 .doc("This is someServer server");
76 // Add a new directory to the root and document it. All the mutators return the node object
77 // itself so operations can be chained.
78 senf::console::DirectoryNode & mydir (
80 .doc("My server specific directory"));
82 // Add a command to that directory
83 mydir.add("mycommand", &mycommand)
84 .doc("mycommand <foo> [<bar>]\n\n"
85 "If <bar> is given, flurgle the <foo>, otherwise burgle it");
87 // Create a SomeClass instance and add it's directory.
89 mydir.add("someClass", someClass.dir);
91 // Start the interactive console server
92 senf::console::Server::start(senf::INet4SocketAddress(senf::INet4Address::None, 23232u))
97 \subsection console_nodes Node types
99 The console/config library tree consists of two basic node types:
101 \li senf::console::DirectoryNode provides internal nodes with an arbitrary number of children
102 \li senf::console::CommandNode describes a command entry in the tree
104 senf::console::CommandNode is the base-class of all command nodes of which there are several,
105 depending on the type of command.
107 There is a single root node, the senf::console::DirectoryNode called senf::console::root(). From
108 this node, the tree is traversed.
110 All nodes are allocated on the heap and are managed using a smart pointer.
112 \subsection console_manipulate Manipulating the node tree
114 There are several ways to add nodes to the tree:
116 \li A senf::console::DirectoryNode can be added using senf::console::DirectoryNode::mkdir().
117 \li An arbitrary node can be created and then (possibly later) added to the tree using the
118 corresponding senf::console::DirectoryNode::add() overload.
119 \li A senf::console::CommandNode is normally added to the tree by directly adding a callback
120 using one of the overloaded senf::console::DirectoryNode::add() members.
122 When directly adding a node callback, the type of node added depends on the type of
123 callback. The callback types which can be added are listed at \ref console_callbacks.
126 void callback(std::ostream & os, senf::console::ParseCommandInfo const & command) { ... }
128 myDirectory.add("foo",&callback);
131 Every node is identified among it's siblings by it's name. The name of the node is set when
132 adding the node to the tree. If the name is empty or non-unique, a unique name will be
133 automatically provided.
135 To remove a node from the tree, just use the nodes senf::console::GenericNode::unlink() or the
136 parents senf::console::DirectoryNode::remove() member. This call removes the node from it's
137 parent and returns a (smart) node pointer.
139 \li If you ignore the return value, the node (and it's children) will be deleted.
140 \li Alternatively, you may store away the node and re-attach it later.
141 \li An node (or subtree) can be moved to a different place by unlinking the node at it's old
142 place and re-adding it at it's new location.
143 \li To rename a node, unlink and re-add it with a different name.
146 myDirectory.add("bar", myDirectory.remove("foo"));
149 \subsection console_node_param Assigning additional node parameters
151 Depending on the node type added, additional node parameters may be set. For example, every node
152 has a documentation parameter which is used by the online-help system. To assign these
153 parameters, the node exposes corresponding member functions. Since
154 senf::console::DirectoryNode::add() returns the newly added node by reference, additional
155 parameters may just be added to the end of the add command:
157 myDirectory.add("foo",&fooCallback).doc("The foo method");
159 Since the parameter setters all return the node reference, additional parameters may just be
160 added to the end of the command.
162 \subsection console_tree_traverse Traversing the tree
164 The simplest way to access tree elements is to save the return value of the
165 senf::console::DirectoryNode::add() members. However, saving the reference will not ensure, that
166 the node is not removed. If the node might be removed from the tree, you should use a smart
167 pointer (either <tt>ptr</tt> or <tt>weak_ptr</tt>) to hold the node.
169 Another possibility is to traverse the tree explicitly. For this purpose, the operators '[]' and
170 '()' have been overloaded in senf::console::DirectoryNode.
172 senf::console::root().getDirectory("myDirectory").getCommand("foo")
173 \\ or more concise but otherwise completely identical
174 senf::console::root()["myDirectory"]("foo")
177 getDirectory and the '[]' operator will return a senf::console::DirectoryNode whereas getCommand
178 and the '()' operator will return a senf::console::CommandNode. If the node is not found or is
179 not of the correct type, an exception will be raised.
181 \section console_object_dir Assigning a directory to an object instance
183 Most objects will register several commands. So it makes sense for these objects to manage their
184 own directory. Since directories are however allocated on the heap, they cannot be directly
185 added to a class. To facilitate this usage, the senf::console::ScopedDirectory is used. This
186 class provides a senf::console::DirectoryNode facade. Internally, it automatically creates a
187 senf::console::DirectoryNode to which all calls are forwarded.
189 The senf::console::ScopedDirectory member should be declared public. This allows the user of the
190 class to add the node to the tree.
198 #include <boost/shared_ptr.hpp>
199 #include <boost/weak_ptr.hpp>
200 #include <boost/enable_shared_from_this.hpp>
201 #include <boost/utility.hpp>
202 #include <boost/range/iterator_range.hpp>
203 #include <boost/typeof/typeof.hpp>
204 #include <boost/type_traits/remove_reference.hpp>
205 #include "../Utils/Exception.hh"
206 #include "../Utils/mpl.hh"
207 #include "../Utils/Logger/SenfLog.hh"
210 //#include "Node.mpp"
211 ///////////////////////////////hh.p////////////////////////////////////////
219 /** \brief Config/console node tree base-class
221 GenericNode is the base class of all node objects. There are two basic node types derived
222 from GenericNode: DirectoryNode and CommandNode.
224 All nodes are dynamically allocated and automatically managed using reference counting.
226 All nodes are normally linked into a single tree which root node is
227 senf::console::root(). Nodes may however be orphaned (not linked to the tree) either
228 directly (the node has no parent) or indirectly (the node has a parent but is part of an
229 orphaned subtree which is not linked to the root node).
231 Every active (non-orphaned) node (except the root() node) has a non-empty node name. This
232 name is assigned to the node when adding the node to the tree.
237 : public boost::enable_shared_from_this<GenericNode>
239 SENF_LOG_CLASS_AREA();
241 ///////////////////////////////////////////////////////////////////////////
244 typedef boost::shared_ptr<GenericNode> ptr;
245 typedef boost::shared_ptr<GenericNode const> cptr;
246 typedef boost::weak_ptr<GenericNode> weak_ptr;
248 ///////////////////////////////////////////////////////////////////////////
250 virtual ~GenericNode();
252 std::string const & name() const; ///< Node name
253 boost::shared_ptr<DirectoryNode> parent() const; ///< Parent node
254 /**< May be null, if the node is the root node or if it is
255 not linked to the tree */
257 std::string path() const; ///< Node path
258 /**< The node path is built by joining the names of all
259 parent nodes with '/' chars. */
261 ptr unlink(); ///< Remove node from it's parent directory
262 /**< You may either discard the return value and thereby
263 dispose the node or may re-attach the node at some
264 other place using DirectoryNode::add(). */
266 bool active() const; ///< \c true, if node is attached to the root() node
268 void help(std::ostream & output) const; /// Write help info to \a output
270 ptr thisptr(); ///< Get smart pointer to node
271 cptr thisptr() const; ///< Get smart pointer to node (const)
276 void name(std::string const & name);
283 virtual void v_help(std::ostream & output) const = 0;
284 ///< Provide help information
285 /**< This member must be implemented in derived classes
286 to provide node specific help information. */
290 DirectoryNode * parent_;
292 friend class DirectoryNode;
295 class SimpleCommandNode;
297 /** \brief Internal: Node creation helper traits
299 This class is used internally to find out the type of node to create for a specific argument
302 template <class Object>
303 struct NodeCreateTraits
305 typedef BOOST_TYPEOF_TPL( senf_console_add_node(
306 * static_cast<DirectoryNode *>(0),
307 * static_cast<std::string const *>(0),
308 * static_cast<Object const *>(0),
311 typedef typename boost::remove_reference<result_type>::type NodeType;
315 static NodeType & create(DirectoryNode & node, std::string const & name,
320 /** \brief Config/console tree directory node
322 This node type provides the internal and root nodes of the tree. It allows to add arbitrary
323 children and supports directory traversal.
325 Nodes are normally not instantiated manually but are created by the DirectoryNode via
326 mkdir() or add(). Special add() members however allow externally allocated node objects.
328 Nodes may be added to the tree only once, otherwise chaos will ensue. Since nodes are always
329 managed dynamically, there is a special ScopedDirectory proxy template which provides a
330 DirectoryNode facade. ScopedDirectory is used if a class wants to manage it's own directory
333 Every node is assigned a (new) name when it is added to a directory. If the directory
334 already has an entry of that name, the name is made unique by appending a suffix of the form
335 '-n' where n is a number starting at 1. If the name is empty, int is set to 'unnamed' and
336 then uniquified as above. Automatically providing unique names simplifies adding
337 configuration/console support to generic components.
341 class DirectoryNode : public GenericNode
343 SENF_LOG_CLASS_AREA();
344 typedef std::map<std::string, GenericNode::ptr> ChildMap;
346 ///////////////////////////////////////////////////////////////////////////
349 typedef boost::shared_ptr<DirectoryNode> ptr;
350 typedef boost::shared_ptr<DirectoryNode const> cptr;
351 typedef boost::weak_ptr<DirectoryNode> weak_ptr;
353 typedef boost::iterator_range<ChildMap::const_iterator> ChildrenRange;
354 typedef ChildMap::const_iterator child_iterator;
356 ///////////////////////////////////////////////////////////////////////////
357 ///\name Structors and default members
360 static ptr create(); ///< Create node object.
361 /**< You should normally use either mkdir() or
362 ScopedDirectory instead of create() */
365 ///////////////////////////////////////////////////////////////////////////
369 template <class NodeType>
370 NodeType & add(std::string const & name, boost::shared_ptr<NodeType> node);
371 ///< Add node to tree
372 /**< Adds the \a node to the tree as a child of \a this
373 node. The node is given the name \a name. If a node of
374 that name already exists, a numeric suffix of the form
375 '-n' is added to the name until the name is unique. If
376 \a name is empty, it is set to 'unnamed'. */
378 template <class Object>
379 typename NodeCreateTraits<Object>::NodeType & add (std::string const & name,
381 ///< Generic child node factory
382 /**< This member is used to create a new child node of the
383 current directory. The type of node created depends on
384 the type of argument passed.
386 The node type is selected by the NodeCreateTraits
387 class. To allow adding a specific node type, you need
388 to provide an overload for
389 <tt>senf_console_add_node</tt> which must be visible at
390 when you register the new node.
392 MyNodeType & senf_console_add_node(
394 std::string const & name,
395 MySpecialObject const & ob,
398 return dir.add(name, MyNodeType::create(ob));
401 (Do not forget the last unnamed 'int' parameter which
402 is not used but serves to disambiguate the
405 GenericNode::ptr remove(std::string const & name);
406 ///< Remove node \a name from the tree
407 /**< The returned pointer may either be discarded, which
408 will automatically dispose the removed node, or it may
409 be saved and/or re-attached at some other place in the
412 bool hasChild(std::string const & name) const;
413 ///< \c true, if there is a child with name \a name
415 GenericNode & get(std::string const & name) const;
417 /**< \throws UnknownNodeNameException if a child \a name
420 DirectoryNode & getDirectory(std::string const & name) const;
421 ///< Get directory child node
422 /**< Same as operator[]
423 \throws UnknownNodeNameException if a child \a name
425 \throws std::bad_cast if the child \a name is not a
428 DirectoryNode & operator[](std::string const & name) const;
429 ///< Get directory child node
430 /**< Same as getDirectory
431 \throws UnknownNodeNameException if a child \a name
433 \throws std::bad_cast if the child \a name is not a
436 CommandNode & getCommand(std::string const & name) const;
437 ///< Get command child node
438 /**< Same as operator()
439 \throws UnknownNodeNameException if a child \a name
441 \throws std::bad_cast if the child \a name is not a
444 CommandNode & operator()(std::string const & name) const;
445 ///< Get command child node
446 /**< Same as getCommand()
447 \throws UnknownNodeNameException if a child \a name
449 \throws std::bad_cast if the child \a name is not a
452 DirectoryNode & mkdir(std::string const & name);
453 ///< Create sub-directory node
455 ChildrenRange children() const;
456 ///< Return iterator range over all children.
457 /**< The returned range is sorted by child name. */
460 ///////////////////////////////////////////////////////////////////////////
462 template <class ForwardRange>
463 GenericNode & traverse(ForwardRange const & range);
464 ///< Traverse node path starting at this node
465 /**< The <tt>ForwardRange::value_type</tt> must be
466 (convertible to) std::string. Each range element
467 constitutes a step along the node traversal.
469 If the range starts with an empty element, the
470 traversal is started at the root() node, otherwise it
471 is started at \a this node. The traversal supports '.',
472 '..' and ignores further empty elements. */
474 DirectoryNode & doc(std::string const & doc);
475 ///< Set node documentation
478 cptr thisptr() const;
484 void add(GenericNode::ptr node);
485 virtual void v_help(std::ostream & output) const;
490 friend DirectoryNode & root();
493 /// Exception: Unknown node name
494 struct UnknownNodeNameException : public senf::Exception
495 { UnknownNodeNameException() : senf::Exception("Unknown node name") {}};
498 template <class Type>
499 struct NodeCreateTraits< boost::shared_ptr<Type> >
503 struct SyntaxErrorException : public senf::Exception
505 explicit SyntaxErrorException(std::string const & msg = "");
507 virtual char const * what() const throw();
510 /** \brief Config/console tree command node
512 The CommandNode is the base-class for the tree leaf nodes. Concrete command node
513 implementations are derived from this class.
515 To execute a command, CommandNode::operator()() or CommandNode::execute() is called.
519 class CommandNode : public GenericNode
521 SENF_LOG_CLASS_AREA();
523 ///////////////////////////////////////////////////////////////////////////
526 typedef boost::shared_ptr<CommandNode> ptr;
527 typedef boost::shared_ptr<CommandNode const> cptr;
528 typedef boost::weak_ptr<CommandNode> weak_ptr;
530 ///////////////////////////////////////////////////////////////////////////
532 void execute(std::ostream & output, ParseCommandInfo const & command) const;
533 ///< Execute the command
534 /**< Same as operator()()
535 \param[in] output stream where result messages may be
537 \param[in] arguments command arguments. This is a
538 range of ranges of ArgumentToken instances. */
540 void operator()(std::ostream & output, ParseCommandInfo const & command) const;
541 ///< Execute the command
542 /**< Same as execute()
543 \param[in] output stream where result messages may be
545 \param[in] arguments command arguments. This is a
546 range of ranges of ArgumentToken instances. */
549 cptr thisptr() const;
557 virtual void v_execute(std::ostream & output, ParseCommandInfo const & command) const = 0;
558 ///< Called to execute the command
559 /**< \param[in] output stream where result messages may be
561 \param[in] arguments command arguments. This is a
562 range of ranges of ArgumentToken instances. */
567 /** \brief Most simple CommandNode implementation
569 This CommandNode implementation simply forwards the \a output and \a arguments arguments to
570 an arbitrary callback.
574 class SimpleCommandNode : public CommandNode
576 SENF_LOG_CLASS_AREA();
578 ///////////////////////////////////////////////////////////////////////////
581 typedef boost::shared_ptr<SimpleCommandNode> ptr;
582 typedef boost::shared_ptr<SimpleCommandNode const> cptr;
583 typedef boost::weak_ptr<SimpleCommandNode> weak_ptr;
585 typedef boost::function<void (std::ostream &, ParseCommandInfo const &)> Function;
587 ///////////////////////////////////////////////////////////////////////////
588 ///\name Structors and default members
591 static ptr create(Function const & fn);
594 ///////////////////////////////////////////////////////////////////////////
597 cptr thisptr() const;
599 SimpleCommandNode & doc(std::string const & doc);
602 SimpleCommandNode(Function const & fn);
605 virtual void v_help(std::ostream & output) const;
606 virtual void v_execute(std::ostream & output, ParseCommandInfo const & command) const;
614 template <class Function>
615 SimpleCommandNode & senf_console_add_node(DirectoryNode & node, std::string const & name,
616 Function const & fn, ...);
619 DirectoryNode & root();
623 #include BOOST_TYPEOF_INCREMENT_REGISTRATION_GROUP()
625 BOOST_TYPEOF_REGISTER_TYPE(senf::console::DirectoryNode)
626 BOOST_TYPEOF_REGISTER_TYPE(senf::console::SimpleCommandNode)
629 ///////////////////////////////hh.e////////////////////////////////////////
639 // comment-column: 40
640 // c-file-style: "senf"
641 // indent-tabs-mode: nil
642 // ispell-local-dictionary: "american"
643 // compile-command: "scons -u test"