[boost] Re: arguments parsing, wildcard matcher

From: Petr Ovchenkov (ptr_at_[hidden])
Date: 2001-11-19 04:31:23

Ok.

Now I have following args parser (I print only usage sample):

...

int main( int argc, char * const * argv )
{
  using namespace std;

  string fname;
  bool turn;

  try {
    Argv arg;
    arg.copyright( "Copyright (C) SomeNiceCompany Ltd., 2001" );
    arg.brief( "VRML 1.0 Monoshape Splitter" );
    arg.option( "-h", false, "print this help message" );
    arg.option( "-f", string(""), "process VRML 1.0 file" );
    arg.option( "-p", false, "Use preprocessed files" );

    try {
      arg.parse( argc, argv );
    }
    catch ( invalid_argument& err ) {
      cerr << err.what() << endl;
      arg.print_help( cerr );
      throw 1;
    }
    if ( arg.assign( "-h", turn ) ) {
      arg.print_help( cerr );
      throw 0;
    }
    arg.assign( "-f", fname );
    arg.assign( "-p", turn );
    if ( fname.length() == 0 ) {
      arg.print_help( cerr );
      throw 0;      
    }
    
  }
  catch ( int r ) {
    return r;
  }
....
}

This parser process only command line options.
IMO, parser for configuration file (<xml> or not) and command line
parser are different parsers.

For command line parser the improvement will be

    Argv arg( Argv::use_some_options_style );
    ...
    arg.option( "h", false, "print this help message" );
    ...

with usage

  cmd --help

or

  cmd -h

or

  cmd /H

in dependence of enum Argv::use_some_options_style.

  - ptr