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source: code/branches/tutorial/src/libraries/core/CommandLineParser.h @ 9215

Last change on this file since 9215 was 7401, checked in by landauf, 14 years ago

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1/*
2 *   ORXONOX - the hottest 3D action shooter ever to exist
3 *                    > www.orxonox.net <
4 *
5 *
6 *   License notice:
7 *
8 *   This program is free software; you can redistribute it and/or
9 *   modify it under the terms of the GNU General Public License
10 *   as published by the Free Software Foundation; either version 2
11 *   of the License, or (at your option) any later version.
12 *
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.
17 *
18 *   You should have received a copy of the GNU General Public License
19 *   along with this program; if not, write to the Free Software
20 *   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
21 *
22 *   Author:
23 *      Reto Grieder
24 *   Co-authors:
25 *      ...
26 *
27 */
28
29/**
30    @defgroup CmdArgs Commandline arguments
31    @ingroup Config
32    @brief For a reference of all commandline arguments see @ref cmdargspage
33*/
34
35/**
36    @file
37    @ingroup Config CmdArgs
38    @brief Declaration of CommandLineParser and CommandLineArgument, definition of the SetCommandLineArgument() macros.
39*/
40
41#ifndef _CommandLine_H__
42#define _CommandLine_H__
43
44#include "CorePrereqs.h"
45
46#include <fstream>
47#include <map>
48#include "util/OrxAssert.h"
49#include "util/MultiType.h"
50
51#define SetCommandLineArgument(name, defaultValue) \
52    orxonox::CommandLineArgument& CmdArgumentDummyBoolVar##name \
53    = orxonox::CommandLineParser::addArgument(#name, defaultValue, false)
54#define SetCommandLineOnlyArgument(name, defaultValue) \
55    orxonox::CommandLineArgument& CmdArgumentDummyBoolVar##name \
56    = orxonox::CommandLineParser::addArgument(#name, defaultValue, true)
57#define SetCommandLineSwitch(name) \
58    orxonox::CommandLineArgument& CmdArgumentDummyBoolVar##name \
59    = orxonox::CommandLineParser::addArgument(#name, false, false)
60#define SetCommandLineOnlySwitch(name) \
61    orxonox::CommandLineArgument& CmdArgumentDummyBoolVar##name \
62    = orxonox::CommandLineParser::addArgument(#name, false, true)
63
64
65namespace orxonox
66{
67    /**
68    @brief
69        Container class for a command line argument of any type supported by MultiType.
70
71        Whenever you want to have an option specified by a command line switch,
72        you need to first define it with SetCommandLineArgument(name, defaultValue).
73        It is then added to a map and possibly changed when the command line is being parsed.
74        If the option was not given, you can detect this by asking hasDefaultValue().
75
76        There is a possibility to define a short cut so you can write "-p 20" instead of "--port 20".
77        Note the difference between "-" and "--"!
78        Also, there is no restriction to the number of strings you add after --name.
79        So "--startVector {2, 4, 5}" is perfectly legal.
80
81        Retrieving an argument is possible with the getCommandLineArgument function of the
82        CommandLineParser class. It is a Singleton, but the public interface is static.
83    */
84    class _CoreExport CommandLineArgument
85    {
86        friend class CommandLineParser;
87
88    public:
89        //! Tells whether the value has been changed by the command line.
90        bool hasDefaultValue() const { return bHasDefaultValue_; }
91        //! Returns the name of the argument.
92        const std::string& getName() const { return name_; }
93
94        //! Returns the shortcut (example: "-p 22" for "--port 22") of the argument.
95        //! Evaluates to "" if there is none.
96        const std::string& getShortcut() const { return shortcut_; }
97        //! Sets the shortcut for the argument
98        CommandLineArgument& shortcut(const std::string& shortcut)
99        { this->shortcut_ = shortcut; return *this; }
100
101        //! Returns the usage information
102        const std::string& getInformation() const { return this->usageInformation_; }
103        //! Sets the option information when displaying orxonox usage.
104        CommandLineArgument& information(const std::string& usage)
105        { this->usageInformation_ = usage; return *this; }
106
107        //! Returns the actual value of the argument. Can be equal to default value.
108        MultiType getValue() const { return value_; }
109        //! Returns the given default value as type T.
110        MultiType getDefaultValue() const { return defaultValue_; }
111
112    private:
113        //! Constructor initialises both value_ and defaultValue_ with defaultValue.
114        CommandLineArgument(const std::string& name, const MultiType& defaultValue, bool bCommandLineOnly)
115            : bHasDefaultValue_(true)
116            , name_(name)
117            , value_(defaultValue)
118            , defaultValue_(defaultValue)
119            , bCommandLineOnly_(bCommandLineOnly)
120        { }
121
122        //! Undefined copy constructor
123        CommandLineArgument(const CommandLineArgument& instance);
124        ~CommandLineArgument() { }
125
126        //! Parses the value string of a command line argument.
127        void parse(const std::string& value, bool bParsingFile);
128
129        //! Tells whether the value has been changed by the command line.
130        bool bHasDefaultValue_;
131
132    private:
133        std::string name_;             //!< Name of the argument
134        std::string shortcut_;         //!< Shortcut of the argument. @see getShortcut().
135        std::string usageInformation_; //!< Tells about the usage of this parameter
136
137        MultiType   value_;            //!< The actual value
138        MultiType   defaultValue_;     //!< Default value. Should not be changed.
139        bool        bCommandLineOnly_; //!< Whether you cannot specify the value in a text file
140    };
141
142
143    /**
144    @brief
145        Global interface to command line options.
146        Allows to add and retrieve command line arguments. Also does the parsing.
147    @note
148        Internally it is a Singleton, but the public interface is static.
149    @see
150        CommandLineArgument
151    */
152    class _CoreExport CommandLineParser
153    {
154    public:
155
156        //! Parse redirection to internal member method.
157        static void parseCommandLine(const std::string& cmdLine) { _getInstance()._parseCommandLine(cmdLine); }
158        static void parseFile() { _getInstance()._parseFile(); }
159
160        static std::string getUsageInformation();
161
162        static const CommandLineArgument* getArgument(const std::string& name);
163        //! Writes the argument value in the given parameter.
164        template <class T>
165        static void getValue(const std::string& name, T* value)
166        { *value = (T)(getArgument(name)->getValue()); }
167        static MultiType getValue(const std::string& name)
168        { return getArgument(name)->getValue(); }
169        template <class T>
170        static CommandLineArgument& addArgument(const std::string& name, T defaultValue, bool bCommandLineOnly);
171
172        static bool existsArgument(const std::string& name)
173        {
174            std::map<std::string, CommandLineArgument*>::const_iterator it = _getInstance().cmdLineArgs_.find(name);
175            return !(it == _getInstance().cmdLineArgs_.end());
176        }
177
178        static void destroyAllArguments();
179
180        static void generateDoc(std::ofstream& file);
181
182    private:
183        //! Constructor initialises bFirstTimeParse_ with true.
184        CommandLineParser() : bFirstTimeParse_(true) { }
185        //! Undefined copy constructor
186        CommandLineParser(const CommandLineParser& instance);
187        ~CommandLineParser();
188
189        static CommandLineParser& _getInstance();
190
191        void _parseCommandLine(const std::string& cmdLine);
192        void _parseFile();
193        void _parse(const std::vector<std::string>& arguments, bool bParsingFile);
194        void checkFullArgument(const std::string& name, const std::string& value, bool bParsingFile);
195        void checkShortcut(const std::string& shortcut, const std::string& value, bool bParsingFile);
196
197        /**
198            Tells whether we parsed for the first time. The CommmandLineArguments are added before main().
199            So when we call parse() the first time, we need to create a map with all shortcuts since these
200            get added after addCommandLineArgument().
201        */
202        bool bFirstTimeParse_;
203
204        //! Holds all pointers to the arguments and serves as a search map by name.
205        std::map<std::string, CommandLineArgument*> cmdLineArgs_;
206        //! Search map by shortcut for the arguments.
207        std::map<std::string, CommandLineArgument*> cmdLineArgsShortcut_;
208    };
209
210    template <>
211    inline void CommandLineParser::getValue<std::string>(const std::string& name, std::string* value)
212    {
213        *value = getArgument(name)->getValue().getString();
214    }
215
216    /**
217    @brief
218        Adds a new CommandLineArgument to the internal map.
219        Note that only such arguments are actually valid.
220    @param name
221        Name of the argument. Shortcut can be added later.
222    @param defaultValue
223        Default value that is used when argument was not given.
224    @param bCommandLineOnly
225        Parsing a file or the command line itself
226    */
227    template <class T>
228    CommandLineArgument& CommandLineParser::addArgument(const std::string& name, T defaultValue, bool bCommandLineOnly)
229    {
230        OrxAssert(!_getInstance().existsArgument(name),
231            "Cannot add a command line argument with name '" + name + "' twice.");
232        OrxAssert(MultiType(defaultValue).getType() != MT_Type::Bool || MultiType(defaultValue).getBool() != true,
233               "Boolean command line arguments with positive default values are not supported." << std::endl
234            << "Please use SetCommandLineSwitch and adjust your argument: " << name);
235
236        return *(_getInstance().cmdLineArgs_[name] = new CommandLineArgument(name, defaultValue, bCommandLineOnly));
237    }
238}
239
240#endif /* _CommandLine_H__ */
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