DBasic.os

#!/usr/local/bin/slang

// library imports
import libParam.ParameterHandler;
import System.Collections.List;
import System.IO.File;
import System.String;
import System.StringIterator;

// project imports
import Consts;
import Debugger;


// public variables
string filename;


public int Main( int argc, string args ) modify {
	var debug = false;
	var params = new ParameterHandler( argc, args );

	// Handle parameters
	// {
	if ( params.contains( "debug" ) ) {
		debug = true;
		params.remove( "debug" );
	}

	if ( params.contains( "version" ) ) {
		print( APPNAME + " " + VERSION );
		return 0;
	}
	// }

	if ( !params.empty() ) {
		// set filename if any params are set
		filename = params[ 0 ].Key;
	}

	try {
		while ( true ) {
			write( "DBasic> " );

			var commandIt = new StringIterator( cin() );
			if ( !commandIt.hasNext() ) {
				continue;
			}

			switch ( commandIt.next() ) {
				case "help": { printHelp(); break; }
				case "load": { loadFile( commandIt ); break; }
				case "run": { run( commandIt ); break; }
				case "quit": { print( "Quitting..." ); return 0; }
				default: { print( "Invalid command" ); break; }
			}
		}
	}
	catch ( string e ) {
		print( "Exception: " + e );
	}
	catch ( IException e ) {
		print( "Exception: " + e.what() );
	}
	catch {
		print( "Exception: uncaught exception!" );
	}

	return 0;
}

void loadFile( StringIterator it ) modify {
	if ( !it.hasNext() ) {
		print( "filename expected!" );
		return;
	}

	filename = it.next();
}

void printHelp() {
	print( "" );
	print( "Available commands:" );
	print( "help    This screen" );
	print( "load    Loads a file for execution" );
	print( "run     Starts a debugging session for the loaded file" );
	print( "quit    Quits the debugger" );
	print( "" );
}

void run( StringIterator it ) modify {
	if ( it.hasNext() ) {
		loadFile( it );
	}

	if ( !filename ) {
		print( "no file selected for debugging" );
		return;
	}

	try {
		var debugger = new Debugger( filename );

		print( "Started debug session..." );
		print( "" );

		debugger.run();

		print( "" );
		print( "Debug session exited." );
	}
	catch ( IException e ) {
		print( "Exception: " + e.what() );
	}
	catch ( string e ) {
		print( "Exception: " + e );
	}
	catch {
		print( "Exception: caught unknown exception!" );
	}
}