/*
* RHQ Management Platform
* Copyright (C) 2005-2012 Red Hat, Inc.
* All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation version 2 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
package org.rhq.scripting;
import java.io.PrintWriter;
import java.util.List;
import javax.script.ScriptContext;
/**
* An interface for performing code completion in a given language.
* This inspired by the jline's <code>Completor</code> interface but
* is defined separately so that we don't introduce a dependency on
* jline where it doesn't make sense.
*
* @author Lukas Krejci
*/
public interface CodeCompletion {
/**
* The code completor can use the provided script context to find out about possible
* completions.
* <p>
* This method is called once before the first {@link #complete(PrintWriter, String, int, List)} method
* is called.
*
* @param scriptContext
*/
void setScriptContext(ScriptContext scriptContext);
/**
* Provides the code completion implementation with the metadata provider it can use to
* format more meaningful completion hints.
*
* @param metadataProvider
*/
void setMetadataProvider(MetadataProvider metadataProvider);
/**
* Generates the completion candidates and fills the supplied list with them.
*
* @param output the output the completor can use to write some additional information to convey some
* additional info to the user
* @param context the context of the code completion, usually that is the current
* statement being edited by the user
* @param cursorPosition the position of the cursor inside the context
* @param completions this should be a list of strings but is intentionally left raw
* so that this interface is compatible with jline's <code>Completor</code>.
* @return the character index in the context for which the completion candidates were
* actually generated (might be different from the cursorPosition).
*/
int complete(PrintWriter output, String context, int cursorPosition, @SuppressWarnings("rawtypes") List candidates);
}