ExpressionsProposalProvider.java

/*
* generated by Xtext
*/
package org.example.expressions.ui.contentassist;

import java.util.List;

import org.eclipse.emf.ecore.EObject;
import org.eclipse.xtext.Assignment;
import org.eclipse.xtext.ui.editor.contentassist.ContentAssistContext;
import org.eclipse.xtext.ui.editor.contentassist.ICompletionProposalAcceptor;
import org.example.expressions.expressions.AbstractElement;
import org.example.expressions.expressions.Variable;
import org.example.expressions.typing.ExpressionsModelUtil;

/**
 * see http://www.eclipse.org/Xtext/documentation/latest/xtext.html#contentAssist on how to customize content assistant
 */
public class ExpressionsProposalProvider extends AbstractExpressionsProposalProvider {
	@Override
	public void completeAtomic_Variable(final EObject elem, Assignment assignment, ContentAssistContext context,
			ICompletionProposalAcceptor acceptor) {
		if (!(elem instanceof AbstractElement)) {
			return; // no proposal
		}
		List<Variable> variables = ExpressionsModelUtil.
				variablesDefinedBefore((AbstractElement)elem);
		for (Variable variable : variables) {
		     acceptor.accept(createCompletionProposal
		    		(variable.getName(), 
		    		variable.getName() + " - Variable", null, 
		    		context));
	    }
		
//		Better implementation reusing scoping
//		lookupCrossReference(((CrossReference) assignment.getTerminal()), context, acceptor,
//				new Predicate<IEObjectDescription>() {
//
//					public boolean apply(IEObjectDescription input) {
//						if (model instanceof ExpressionsModel) {
//							return false;
//						}
//						List<Variable> variables = ExpressionsModelUtil.variablesDefinedBefore(model);
//						boolean found = false;
//						for (Iterator<Variable> iterator = variables.iterator(); iterator.hasNext();) {
//							Variable variable = iterator.next();
//							if (input.getName().toString().equals(variable.getName())) {
//								found = true;
//								break;
//							}
//						}
//						return found;
//					}
//
//				});
	}
}