Changeset - r842:c2ff0a365245
« 831:cc9e0c
843:81f7e9 »
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alpar (Alpar Juttner)
alpar@cs.elte.hu
ArgParser can throw exception instead of exit(1) (#332)
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3 files changed with 70 insertions and 5 deletions:
demo/arg_parser_demo.cc
9
lemon/arg_parser.cc
14
5
lemon/arg_parser.h
47
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demo/arg_parser_demo.cc
Show white space 4 line context
... ... 
@@ -66,7 +66,16 @@
66 66 
    .other("...");
67 67 

			




	
	68
	
		
  // Throw an exception when problems occurs. The default behavior is to


			




	
	69
	
		
  // exit(1) on these cases, but this makes Valgrind falsely warn


			




	
	70
	
		
  // about memory leaks.


			




	
	71
	
		
  ap.throwOnProblems();


			




	
	72
	
		
  


			




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  // Perform the parsing process


			




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  // (in case of any error it terminates the program)


			




	
	75
	
		
  // The try {} construct is necessary only if the ap.trowOnProblems()


			




	
	76
	
		
  // setting is in use.


			




	
	77
	
		
  try {


			




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	78
	
		
  ap.parse();


			




	
	79
	
		
  } catch (ArgParserException &) { return 1; }


			




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  // Check each option if it has been given and print its value

			




        

    

    

    

        

            

                

                    lemon/arg_parser.cc
                

                

                  
                  
                  
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@@ -21,12 +21,21 @@


			




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namespace lemon {


			




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  void ArgParser::_terminate(ArgParserException::Reason reason) const


			




	
	24
	
		
  {


			




	
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    if(_exit_on_problems)


			




	
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      exit(1);


			




	
	27
	
		
    else throw(ArgParserException(reason));


			




	
	28
	
		
  }


			




	
	29
	
		
  


			




	
	30
	
		
  


			




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  void ArgParser::_showHelp(void *p)


			




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  {


			




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    (static_cast<ArgParser*>(p))->showHelp();


			




	26
	
	
		
    exit(1);


			




	
	34
	
		
    (static_cast<ArgParser*>(p))->_terminate(ArgParserException::HELP);


			




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  }


			




	28
	36
	
		

			




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  ArgParser::ArgParser(int argc, const char * const *argv)


			




	30
	
	
		
    :_argc(argc), _argv(argv), _command_name(argv[0]) {


			




	
	38
	
		
    :_argc(argc), _argv(argv), _command_name(argv[0]),


			




	
	39
	
		
    _exit_on_problems(true) {


			




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    funcOption("-help","Print a short help message",_showHelp,this);


			




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    synonym("help","-help");


			




	...
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@@ -343,5 +352,5 @@


			




	343
	352
	
		
        i!=_others_help.end();++i) showHelp(i);


			




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    for(Opts::const_iterator i=_opts.begin();i!=_opts.end();++i) showHelp(i);


			




	345
	
	
		
    exit(1);


			




	
	354
	
		
    _terminate(ArgParserException::HELP);


			




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  }


			




	347
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	...
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@@ -352,5 +361,5 @@


			




	352
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    std::cerr << "\nType '" << _command_name <<


			




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      " --help' to obtain a short summary on the usage.\n\n";


			




	354
	
	
		
    exit(1);


			




	
	363
	
		
    _terminate(ArgParserException::UNKNOWN_OPT);


			




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  }


			




	356
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	...
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@@ -415,5 +424,5 @@


			




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      std::cerr << "\nType '" << _command_name <<


			




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        " --help' to obtain a short summary on the usage.\n\n";


			




	417
	
	
		
      exit(1);


			




	
	426
	
		
      _terminate(ArgParserException::INVALID_OPT);


			




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    }


			




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  }

			




        

    

    

    

        

            

                

                    lemon/arg_parser.h
                

                

                  
                  
                  
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@@ -35,4 +35,42 @@


			




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namespace lemon {


			




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	37
	
		
  ///Exception used by ArgParser


			




	
	38
	
		
  class ArgParserException : public Exception {


			




	
	39
	
		
  public:


			




	
	40
	
		
    enum Reason {


			




	
	41
	
		
      HELP,         /// <tt>--help</tt> option was given


			




	
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      UNKNOWN_OPT,  /// Unknown option was given


			




	
	43
	
		
      INVALID_OPT   /// Invalid combination of options


			




	
	44
	
		
    };


			




	
	45
	
		
    


			




	
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  private:


			




	
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    Reason _reason;


			




	
	48
	
		
    


			




	
	49
	
		
  public:


			




	
	50
	
		
    ///Constructor


			




	
	51
	
		
    ArgParserException(Reason r) throw() : _reason(r) {}


			




	
	52
	
		
    ///Virtual destructor


			




	
	53
	
		
    virtual ~ArgParserException() throw() {}


			




	
	54
	
		
    ///A short description of the exception


			




	
	55
	
		
    virtual const char* what() const throw() {


			




	
	56
	
		
      switch(_reason)


			




	
	57
	
		
        {


			




	
	58
	
		
        case HELP:


			




	
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          return "lemon::ArgParseException: ask for help";


			




	
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          break;


			




	
	61
	
		
        case UNKNOWN_OPT:


			




	
	62
	
		
          return "lemon::ArgParseException: unknown option";


			




	
	63
	
		
          break;


			




	
	64
	
		
        case INVALID_OPT:


			




	
	65
	
		
          return "lemon::ArgParseException: invalid combination of options";


			




	
	66
	
		
          break;


			




	
	67
	
		
        }


			




	
	68
	
		
      return "";


			




	
	69
	
		
    }


			




	
	70
	
		
    ///Return the reason for the failure


			




	
	71
	
		
    Reason reason() const {return _reason; }


			




	
	72
	
		
  };


			




	
	73
	
		

			




	
	74
	
		

			




	37
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  ///Command line arguments parser


			




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@@ -117,4 +155,8 @@


			




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                    void (*func)(void *),void *data);


			




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	157
	
		
    bool _exit_on_problems;


			




	
	158
	
		
    


			




	
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    void _terminate(ArgParserException::Reason reason) const;


			




	
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  public:


			




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@@ -381,4 +423,9 @@


			




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    const std::vector<std::string> &files() const { return _file_args; }


			




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	425
	
		
    ///Throw instead of exit in case of problems


			




	
	426
	
		
    void throwOnProblems() 


			




	
	427
	
		
    {


			




	
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      _exit_on_problems=false;


			




	
	429
	
		
    }


			




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  };


			




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}


			




        

    






    
    



    


    

     
    
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