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package com.baomidou.framework.velocity.directive;

import org.apache.velocity.context.InternalContextAdapter;
import org.apache.velocity.exception.ParseErrorException;
import org.apache.velocity.runtime.parser.node.Node;
import org.apache.velocity.runtime.parser.node.SimpleNode;

import com.baomidou.framework.velocity.directive.OverrideDirective.OverrideNodeWrapper;

public class DirectiveUtil {

	static String BLOCK = "__vm_override__";

	static String OVERRIDE_CURRENT_NODE = "__vm_current_override_node__";


	static String getOverrideVariableName( String name ) {
		return BLOCK + name;
	}


	static String getRequiredArgument( InternalContextAdapter context, Node node, int argumentIndex, String directive )
		throws ParseErrorException {
		SimpleNode sn_value = (SimpleNode) node.jjtGetChild(argumentIndex);
		if ( sn_value == null ) {
			throw new ParseErrorException(
					"required argument is null with directive:#" + directive + "(),argumentIndex=" + argumentIndex);
		}

		String value = (String) sn_value.value(context);
		if ( value == null ) {
			throw new ParseErrorException(
					"required argument is null with directive:#" + directive + "(),argumentIndex=" + argumentIndex);
		}
		return value;
	}


	public static void setParentForTop( OverrideNodeWrapper topParentNode, OverrideNodeWrapper node ) {
		OverrideNodeWrapper top = node;
		while ( top.parentNode != null ) {
			top = top.parentNode;
		}
		top.parentNode = topParentNode;
	}

}