Script Examples

A first script showing the power of emfscript

/ M3 Level : The meta-meta-model is 'ecore' 
var ecore = importModelDef( 'org.eclipse.emf.ecore', 'import.org.eclipse.emf.ecore.EcorePackage' );
var expr = xmiLoadModelElement( 'platform:/resource/fr.enic.emfshell/models/expr.ecore' );

// M2 Level : The meta-model 'lang' has the Program and Variable concepts 
var lang = xmiLoadModelElement( 'lang.ecore' );

// Decorate the 'lang' metamodel :
// add an EOperation to the lang.Program class
var eop_run = ecore.EOperation.create();
eop_run.name = 'run';
lang.Program.eOperations.add( eop_run );
lang.Program.run._body = function() {
         var vars = this.variables;
         function Context() {
                  var known = [];
                   this.add = function( v ) {
	               var i;
	               for (i in known) {
	                       var k = known[i];
	                       if (k.name == v.name)
	                               return k;
	               }
	               known = known.concat( v );
	               return null;
	       }
	}
	var cx = new Context();
	var i;
	for (i in vars) {
	       var v = vars[i];
	       var k = cx.add(v);
        if (k)
                print( k.name+' : '+k.value );
	}
}
var eops = lang.Program.eOperations;
// provide a JavaScript implementation for the HUTN EOperation
var eop_hutn1 = eops.select(function(e){ return e.name=='asHUTN' && e.eParameters.size()==0;} ).first();
eop_hutn1._body = function()  {
// the '_' underscore indicates that body is not an ecore concept
	print( 'Program '+this.name+';' );
	var vars = this.variables;
	for (i in vars) {
	       var v = vars[i];
	       print( '  '+v.name+(v.value ? ' = '+v.value : '')+';' );
  }
  print( 'end.' );
}
// multiple eOperations with the same name
var eop_hutn2 = eops.select(function(e){ return e.name=='asHUTN' && e.eParameters.size()==1 && e.eParameters[0].eType==ecore.EIntegerObject;} ).first();
eop_hutn2._body = function()  {
  print( this.name+'.asHUTN(EIntegerObject)' );
}
// multiple eOperations with the same name
var eop_hutn3 = eops.select(function(e){ return e.name=='asHUTN' && e.eParameters.size()==1 && e.eParameters[0].eType==ecore.EString;} ).first();
eop_hutn3._body = function()  {
  print( this.name+'.asHUTN(EString)' );
}

//  M1 Level : The 'HelloWorld' model which is an instance of 'lang' metamodel
var prog = lang.Program.create();
prog.name = 'HelloWorld';
var x = lang.Variable.create();
prog.variables.add( x );
x.name = 'x';
x.value = 5.1;
var y = lang.Variable.create();
prog.variables.add( y );
y.name = 'y';
y.value = 3.0;
x = lang.Variable.create();
prog.variables.add( x );
x.name = 'x';
y = lang.Variable.create();
prog.variables.add( y );
y.name = 'y';

// display the program HUTN
prog.asHUTN();
// run the 'prog' Program instance
prog.run();

// discrimination on arguments
prog.asHUTN( 'Hello' );
prog.asHUTN( new java.lang.Integer( 5 ) );

EMFScript

Models Scripting with EMF & Javascript