package org.eclipse.wst.xml.xpath2.processor;

import org.eclipse.wst.xml.xpath2.api.ResultSequence;
import org.eclipse.wst.xml.xpath2.api.StaticContext;
import org.eclipse.wst.xml.xpath2.api.XPath2Engine;
import org.eclipse.wst.xml.xpath2.api.XPath2Expression;
import org.eclipse.wst.xml.xpath2.processor.ast.XPath;
import org.eclipse.wst.xml.xpath2.processor.internal.function.FnBoolean;

/**
 * @since 2.0
 */
public class Engine implements XPath2Engine {

	public XPath2Expression parseExpression(String expression, StaticContext context) {

		XPath xPath = new JFlexCupParser().parse(expression);
		xPath.setStaticContext(context);
		StaticNameResolver name_check = new StaticNameResolver(context);
		name_check.check(xPath);
		
		xPath.setAxes(name_check.getAxes());
		xPath.setFreeVariables(name_check.getFreeVariables());
		xPath.setResolvedFunctions(name_check.getResolvedFunctions());
		xPath.setRootUsed(name_check.isRootUsed());
		
		return xPath;
	}

	boolean effectiveBooleanValue(ResultSequence rs) {
		return FnBoolean.fn_boolean(rs).value();
	}
}