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 ParsedCommand public header */
26 #ifndef HH_SENF_Scheduler_Console_ParsedCommand_
27 #define HH_SENF_Scheduler_Console_ParsedCommand_ 1
31 #define BOOST_PARAMETER_MAX_ARITY 6
34 #include <boost/type_traits/function_traits.hpp>
35 #include <boost/type_traits/is_member_pointer.hpp>
36 #include <boost/mpl/if.hpp>
37 #include <boost/utility.hpp>
38 #include <boost/parameter/keyword.hpp>
39 #include <boost/parameter/parameters.hpp>
40 #include <senf/config.hh>
41 #include "OverloadedCommand.hh"
43 #include <senf/Utils/type_traits.hh>
45 #include "ParsedCommand.ih"
46 #include "ParsedCommand.mpp"
47 ///////////////////////////////hh.p////////////////////////////////////////
52 namespace detail { class ArgumentInfoBase; }
54 /** \brief CommandOverload implementation with automatic argument parsing
56 ParsedCommandOverloadBase implements a CommandOverload implementation supporting automatic
57 parsing of arguments. This is \e not a node, it's a CommandOverload which is then added to
58 an OverloadedCommandNode instance.
60 Automatic argument parsing and return value processing consists of several components:
61 \li \ref overload_add Adding overload instances to the tree
62 \li (Advanced) \ref overload_parse
63 \li (Advanced) \ref overload_format
65 \section overload_add Adding argument parsing callbacks to the tree
67 Adding appropriate callbacks to the tree is very simple: just path a function pointer to
68 DirectoryNode::add() or a member function pointer to ScopedDirectory::add().
70 std::string taskStatus(int id);
72 senf::console::root().add("taskStatus", &taskStatus);
75 There are quite a number of additional parameters available to be set. These parameters are
76 documented in ParsedArgumentAttributor. Parameters are set by adding them as additional
77 calls after adding the node:
80 senf::console::root().add("taskStatus", &taskStatus)
81 .doc("Query the current task status")
83 description = "numeric id of task to check, -1 for the current task."
87 You may also add an additional \c std::ostream & Argument as first argument to the
88 callback. If this argument is present, the stream connected to the console which issued the
89 command will be passed there. This allows writing arbitrary messages to the console.
91 Additionally, overloading is supported by registering multiple commands under the same
92 name. So, elaborating on above example:
94 std::string taskStatus(int id);
95 std::string taskStatus(std::string const & name);
98 .add("taskStatus", static_cast<std::string (*)(int)>(&taskStatus))
99 .doc("Query the current task status")
100 .overloadDoc("Query status by id")
102 description = "numeric id of task to check, -1 for the current task."
103 default_value = -1 );
104 senf::console::root()
105 .add("taskStatus", static_cast<std::string (*)(std::string const &)>(&taskStatus))
106 .overloadDoc("Query status by name")
108 description = "name of task to check" );
111 We can see here, that taking the address of an overloaded function requires a cast. If you
112 can give unique names to each of the C++ overloads (not the overloads in the console), you
113 should do so to make the unwieldy casts unnecessary.
115 \section overload_parse Custom parameter parsers
117 By default, parameters are parsed using \c boost::lexical_cast and therefore using \c
118 iostreams. This means, that any type which can be read from a stream can automatically be
119 used as argument type.
121 However, argument parsing can be configured by specializing
122 senf::console::ArgumentTraits. See that class for more information.
124 \section overload_format Custom return-value formatters
126 By default, return values are streamed to an ostream. This automatically allows any
127 streamable type to be used as return value. To add new types or customize the formating, the
128 senf::console::ReturnValueTraits template needs to be specialized for that type. See
129 that class for more information.
131 \ingroup console_commands
133 class ParsedCommandOverloadBase
134 : public CommandOverload
137 typedef boost::intrusive_ptr<ParsedCommandOverloadBase> ptr;
139 detail::ArgumentInfoBase & arg(unsigned n) const;
141 void doc(std::string const & d);
144 ParsedCommandOverloadBase();
146 template <class Type> void addParameter();
149 virtual unsigned v_numArguments() const;
150 virtual void v_argumentDoc(unsigned index, ArgumentDoc & doc) const;
151 virtual std::string v_doc() const;
153 typedef std::vector<detail::ArgumentInfoBase::ptr> Parameters;
154 Parameters parameters_;
158 /** \brief Parsed command overload
160 ParsedCommandOverload provides the command overload added to an OverloadedCommandNode for an
161 automatically parsed command.
163 This class is normally instantiated automatically when adding a function or member-function
164 pointer as callback to the tree. Manually instantiation this type of overload is \e not
165 simple, since the function signature has to be manipulated correctly to support the optional
166 \c std::ostream first argument.
168 \implementation This class is specialized for each supported number of command arguments.
170 \todo Implement automatic binding of member functions for parser and formatter
172 template <class FunctionTraits, class ReturnType, unsigned arity>
173 class ParsedCommandOverload : public ParsedCommandOverloadBase
176 typedef boost::intrusive_ptr<ParsedCommandOverload> ptr;
179 static ptr create(Function fn);
185 # define BOOST_PP_ITERATION_PARAMS_1 (4, (0, SENF_CONSOLE_MAX_COMMAND_ARITY, \
186 SENF_ABSOLUTE_INCLUDE_PATH(Utils/Console/ParsedCommand.mpp), \
188 # include BOOST_PP_ITERATE()
192 /** \brief Generic ParsedCommandOverladBase attributes
194 Attributes for parsed commands are not set directly on the node. They are set via a special
195 attributor temporary returned when adding a parsed command to the tree.
197 This class is the base class for those attributors. It provides members which do not depend
198 in any way on the exact type of command added.
200 \see \ref console_autoparse
202 class ParsedCommandAttributorBase
205 OverloadedCommandNode & node() const; ///< Return the node object
206 operator OverloadedCommandNode & () const; ///< Automatically convert to node object
209 ParsedCommandAttributorBase(ParsedCommandOverloadBase & overload, unsigned index);
211 void argName(std::string const & name) const;
212 void argDoc(std::string const & doc) const;
213 void typeName(std::string const & doc) const;
214 void defaultDoc(std::string const & doc) const;
216 ParsedCommandOverloadBase & overload() const;
217 void overloadDoc(std::string const & doc) const;
218 void nodeDoc(std::string const & doc) const;
219 void shortDoc(std::string const & doc) const;
222 ParsedCommandOverloadBase & overload_;
226 /** \brief Non argument dependent ParsedCommandBase attributes
228 Attributes for parsed commands are not set directly on the node. They are set via a special
229 attributor temporary returned when adding a parsed command to the tree.
231 This class adds all those members, which do depend on the type of command added (and thereby
232 on that commands signature) but do not depend on the type of any single argument.
234 \see \ref console_autoparse
236 template <class Overload>
237 class ParsedCommandAttributor
238 : public ParsedCommandAttributorBase
241 Overload & overload() const; ///< Get the command overload
244 ParsedCommandAttributor(Overload & overload, unsigned index);
249 /** \brief Keyword argument tags
251 The tags defined in this namespace are used as keyword arguments via the <a
252 href="http://www.boost.org/doc/libs/1_33_1/libs/parameter/doc/html/index.html">Boost.Parameter</a>
255 For the keyword tags, the standard C++ scoping rules apply
257 // Either qualify them with their complete namespace
259 .arg( senf::console::kw::name = "name" );
261 // Or use a namespace alias
262 namespace kw = senf::console::kw;
264 .arg( kw::name = "name" );
266 // Or import the keywords into the current namespace (beware of name collisions)
267 using namespace senf::console::kw;
269 .arg( name = "name" );
272 The second alternative is preferred, the <tt>using namespace</tt> directive may be used as
273 long as the keyword names do not clash with another visible symbol.
275 \section kw_attributes Argument attribute values
277 The keywords are used to set argument attributes. The keywords \ref default_value and \ref
278 parser influence, how an argument is parsed/interpreted whereas \ref name, \ref description,
279 \ref type_name and \ref default_doc are used to change the arguments documentation:
283 dir.add("command", &command)
284 .arg( kw::name = "name",
285 kw::description = "description",
286 kw::default_value = 1,
287 kw::type_name = "type_name",
288 kw::default_doc = "default_doc" );
290 Will create the following documentation:
294 command [name:type_name]
302 \see \ref senf::console::ParsedArgumentAttributor::arg()
305 BOOST_PARAMETER_KEYWORD(type, name) ///< Argument name
306 /**< Sets the displayed name of the argument. */
307 BOOST_PARAMETER_KEYWORD(type, description) ///< One-line argument description
308 /**< This description is shown in the argument
309 reference. If several overloads have same-named
310 arguments, only one of them should be documented. This
311 documentation then applies to all arguments of that
313 BOOST_PARAMETER_KEYWORD(type, default_value) ///< Argument default value
314 /**< If a default value is specified for an argument, that
315 argument is optional. If an overload is called with
316 fewer arguments than defined, optional values will be
317 used beginning at the last optional argument and going
318 forward until all arguments have values assigned. E.g.,
319 an overload with 5 parameters \a a - \a e with two
322 command a:int [b:int] c:int [d:int] e:int
324 When calling the overload, the arguments will be
325 assigned in the following way:
326 <table class="senf fixedwidth">
328 <td style="whitespace:no-wrap"><tt>command 1 2</tt></td>
329 <td colspan="5">SyntaxErrorException: invalid number of
333 <td style="white-space:nowrap"><tt>command 1 2 3</tt></td>
334 <td style="width:6em">\a a = 1</td><td style="width:6em">\a b = \e default</td><td style="width:6em">\a c = 2</td><td style="width:6em">\a d = \e default</td><td style="width:6em">\a e = 3</td>
337 <td style="white-space:nowrap"><tt>command 1 2 3 4</tt></td>
338 <td>\a a = 1</td><td>\a b = 2</td><td>\a c = 3</td><td>\a d = \e default</td><td>\a e = 4</td>
341 <td style="white-space:nowrap"><tt>command 1 2 3 4 5</tt></td>
342 <td>\a a = 1</td><td>\a b = 2</td><td>\a c = 3</td><td>\a d = 4</td><td>\a e = 5</td>
345 <td style="white-space:nowrap"><tt>command 1 2 3 4 5 6</tt></td>
346 <td colspan="5">SyntaxErrorException: invalid number of
350 So, if you use default values as you are used to,
351 assigning default values to consecutive trailing
352 arguments, they work like they do in C++ and most other
354 BOOST_PARAMETER_KEYWORD(type, type_name) ///< Type name of this arguments type
355 /**< By default, the type of an argument is extracted from
356 the C++ type name by taking the last component of the
357 fully scoped name. This value can be changed by setting
359 BOOST_PARAMETER_KEYWORD(type, default_doc) ///< String rep of default value
360 /**< By default, the default value is documented by
361 converting the value to it's string representation
362 using the corresponding return value formatter which by
363 default uses \c boost::lexical_cast / \c iostreams. The
364 displayed value can be changed by setting this
366 BOOST_PARAMETER_KEYWORD(type, parser) ///< Argument parser
367 /**< The argument parser is used to convert the argument
368 token list returned by the console/config parser into
369 the appropriate value. If not set explicitly, this
370 conversion is supplied by the ArgumentTraits
373 Setting the \a parser attribute allows to use a custom
374 parser. The parser is an arbitrary callable object with
377 void parser(senf::console::ParseCommandInfo::TokensRange const & tokens, value_type & out);
379 where \c value_type is the type of the overload
380 parameter. The parser must read and parse the complete
381 \a tokens range and return the parsed value in \a
382 out. If the parser fails, it must raise a
383 senf::console::SyntaxErrorException. */
386 /** \brief Derived class dependent ParsedCommandBase attributes
388 Attributes for parsed commands are not set directly on the node. They are set via a special
389 attributor temporary returned when adding a parsed command to the tree.
391 This class adds all those members, which do not depend on any specific argument but which
392 need to return the correct attributor type.
394 \see \ref console_autoparse
396 template <class Overload, class Self, class ReturnType=typename Overload::traits::result_type>
397 class ParsedArgumentAttributorBase
398 : public ParsedCommandAttributor<Overload>
401 Self doc(std::string const & doc) const; ///< Set documentation for all overloads
402 Self shortdoc(std::string const & doc) const; ///< Set short documentation for all overloads
403 Self overloadDoc(std::string const & doc) const; ///< Set overload specific documentation
404 Self formatter(typename Overload::Formatter formatter) const;
405 ///< Set return value formatter
406 /**< This member is only available, if the \a ReturnType of
407 the installed callback is not \c void.
409 If \a ReturnType is not \c void, the \a formatter must
410 be a callable with a signature compatible with
412 void formatter(ReturnType const & value, std::ostream & os);
414 The \a formatter takes the return value of the call \a
415 value and writes it properly formated to \a os. */
418 ParsedArgumentAttributorBase(Overload & overload, unsigned index);
425 template <class Overload, class Self>
426 class ParsedArgumentAttributorBase<Overload, Self, void>
427 : public ParsedCommandAttributor<Overload>
430 Self doc(std::string const & doc) const; ///< Set documentation for all overloads
431 Self shortdoc(std::string const & doc) const; ///< Set short documentation for all overloads
432 Self overloadDoc(std::string const & doc) const; ///< Set overload specific documentation
435 ParsedArgumentAttributorBase(Overload & overload, unsigned index);
442 /** \brief Argument dependent ParsedCommandBase attributes
444 Attributes for parsed commands are not set directly on the node. They are set via a special
445 attributor temporary returned when adding a parsed command to the tree.
447 This class adds all those members, which depend on a specific argument. Each call to \c arg
448 will advance to the next argument.
450 \see \ref console_autoparse
452 template < class Overload, unsigned index, bool flag>
453 class ParsedArgumentAttributor
454 : public ParsedArgumentAttributorBase< Overload,
455 ParsedArgumentAttributor<Overload, index, flag> >
457 typedef boost::parameter::parameters<
459 kw::type::description,
460 kw::type::default_value,
462 kw::type::default_doc,
463 kw::type::parser> arg_params;
466 typedef OverloadedCommandNode node_type;
467 typedef ParsedArgumentAttributor return_type;
469 typedef typename senf::function_traits_arg_type<
470 typename Overload::traits, int(index) >::type arg_type;
471 typedef typename senf::remove_cvref< arg_type >::type value_type;
472 typedef ParsedArgumentAttributor<Overload, index+1> next_type;
474 next_type arg() const; ///< Set argument attributes
475 /**< This member changes the attributes for the current
476 argument. The attributes are passed to arg() as keyword
477 arguments using the <a
478 href="http://www.boost.org/doc/libs/1_33_1/libs/parameter/doc/html/index.html">Boost.Parameter</a>
482 .arg( kw::name = "name",
483 kw::default_value = 1 )
486 The valid keywords are defined in the senf::console::kw
489 Each call to arg() will increment the argument index
490 and advance to the next argument. This member is only
491 present, if there is an argument at the current
496 # define BOOST_PP_ITERATION_PARAMS_1 \
497 (4, (1, BOOST_PARAMETER_MAX_ARITY, \
498 SENF_ABSOLUTE_INCLUDE_PATH(Utils/Console/ParsedCommand.mpp), \
500 # include BOOST_PP_ITERATE()
505 explicit ParsedArgumentAttributor(Overload & overload);
507 template <class ArgumentPack>
508 next_type argInfo(ArgumentPack const & args) const;
509 template <class Kw, class ArgumentPack>
510 void argInfo(Kw const &, ArgumentPack const &, boost::mpl::false_)
513 template <class ArgumentPack>
514 void argInfo(boost::parameter::keyword<kw::type::name> const &,
515 ArgumentPack const & args, boost::mpl::true_)
517 template <class ArgumentPack>
518 void argInfo(boost::parameter::keyword<kw::type::description> const &,
519 ArgumentPack const & args, boost::mpl::true_)
521 template <class ArgumentPack>
522 void argInfo(boost::parameter::keyword<kw::type::default_value> const &,
523 ArgumentPack const & args, boost::mpl::true_)
525 template <class ArgumentPack>
526 void argInfo(boost::parameter::keyword<kw::type::type_name> const &,
527 ArgumentPack const & args, boost::mpl::true_)
529 template <class ArgumentPack>
530 void argInfo(boost::parameter::keyword<kw::type::default_doc> const &,
531 ArgumentPack const & args, boost::mpl::true_)
533 template <class ArgumentPack>
534 void argInfo(boost::parameter::keyword<kw::type::parser> const &,
535 ArgumentPack const & args, boost::mpl::true_)
538 next_type next() const;
540 void defaultValue(value_type const & value) const;
541 template <class Fn> void parser(Fn fn) const;
543 template <class O, unsigned i, bool f>
544 friend class ParsedArgumentAttributor;
546 friend class detail::ParsedCommandAddNodeAccess;
551 template <class Overload, unsigned index>
552 class ParsedArgumentAttributor<Overload, index, false>
553 : public ParsedArgumentAttributorBase< Overload,
554 ParsedArgumentAttributor<Overload, index, false> >
557 typedef OverloadedCommandNode node_type;
558 typedef ParsedArgumentAttributor return_type;
561 explicit ParsedArgumentAttributor(Overload & overload);
563 template <class O, unsigned i, bool f>
564 friend class ParsedArgumentAttributor;
566 friend class detail::ParsedCommandAddNodeAccess;
569 template <class Function>
570 typename detail::ParsedCommandTraits<Function>::Attributor
571 senf_console_add_node(DirectoryNode & node, std::string const & name, Function fn, int,
572 typename boost::enable_if_c<
573 detail::ParsedCommandTraits<Function>::is_callable>::type * = 0);
575 template <class Signature>
576 typename detail::ParsedCommandTraits<Signature>::Attributor
577 senf_console_add_node(DirectoryNode & node, std::string const & name,
578 boost::function<Signature> fn, int);
580 template <class Owner, class Function>
581 typename detail::ParsedCommandTraits<Function>::Attributor
582 senf_console_add_node(DirectoryNode & node, Owner & owner, std::string const & name,
584 typename boost::enable_if_c<
585 detail::ParsedCommandTraits<Function>::is_member>::type * = 0);
591 #include BOOST_TYPEOF_INCREMENT_REGISTRATION_GROUP()
593 BOOST_TYPEOF_REGISTER_TEMPLATE(senf::console::ParsedCommandOverload, (class,unsigned))
594 BOOST_TYPEOF_REGISTER_TEMPLATE(senf::console::ParsedArgumentAttributor, (class, unsigned, bool))
595 BOOST_TYPEOF_REGISTER_TEMPLATE(boost::function_traits, 1)
597 ///////////////////////////////hh.e////////////////////////////////////////
598 #include "ParsedCommand.cci"
599 #include "ParsedCommand.ct"
600 #include "ParsedCommand.cti"
607 // comment-column: 40
608 // c-file-style: "senf"
609 // indent-tabs-mode: nil
610 // ispell-local-dictionary: "american"
611 // compile-command: "scons -u test"