package org.eclipse.dltk.ruby.internal.debug;

import org.eclipse.debug.core.DebugException;
import org.eclipse.debug.core.model.IStackFrame;
import org.eclipse.dltk.core.DLTKCore;
import org.eclipse.dltk.debug.core.ISmartStepEvaluator;
import org.eclipse.dltk.debug.core.model.IScriptStackFrame;
import org.eclipse.dltk.debug.core.model.IScriptThread;

public class RubySmartStepEvaluator implements ISmartStepEvaluator {

	public RubySmartStepEvaluator() {
	}

	@Override
	public boolean isFiltered(String[] filters, IScriptThread thread) {
		try {
			final IStackFrame topFrame = thread.getTopStackFrame();
			if (topFrame instanceof IScriptStackFrame) {
				final String where = ((IScriptStackFrame) topFrame).getWhere();
				final int colonPos = where.lastIndexOf("::"); //$NON-NLS-1$
				if (colonPos > 0) {
					final String className = where.substring(0, colonPos);
					if (filter(className, filters)) {
						return true;
					}
				} else {
					if (filter(where, filters)) {
						return true;
					}
				}
			}
		} catch (DebugException e) {
			if (DLTKCore.DEBUG) {
				e.printStackTrace();
			}
		}
		return false;
	}

	private boolean filter(String typeQualifiedName, String[] filters) {
		typeQualifiedName = typeQualifiedName.replaceAll("::", "."); //$NON-NLS-1$ //$NON-NLS-2$
		for (int i = 0; i < filters.length; i++) {
			if (filters[i].equals(typeQualifiedName)) {
				return true;
			}
		}
		return false;
	}

}