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Treepat is a language to recognise patterns in trees in a similar way as regular expressions recognize patterns in strings. Treepat includes analogous operators to regex union, concatenation, and closure, which are extended to the notion of trees.

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// Generated from antlr/tree_format/TreeFormat.g4 by ANTLR 4.1
package antlr.tree_format;
import org.antlr.v4.runtime.misc.NotNull;
import org.antlr.v4.runtime.tree.AbstractParseTreeVisitor;

/**
 * This class provides an empty implementation of {@link TreeFormatVisitor},
 * which can be extended to create a visitor which only needs to handle a subset
 * of the available methods.
 *
 * @param  The return type of the visit operation. Use {@link Void} for
 * operations with no return type.
 */
public class TreeFormatBaseVisitor extends AbstractParseTreeVisitor implements TreeFormatVisitor {
	/**
	 * {@inheritDoc}
	 * 
	 * The default implementation returns the result of calling
	 * {@link #visitChildren} on {@code ctx}.
	 */
	@Override public T visitSubtree(@NotNull TreeFormatParser.SubtreeContext ctx) { return visitChildren(ctx); }

	/**
	 * {@inheritDoc}
	 * 

	 * The default implementation returns the result of calling
	 * {@link #visitChildren} on {@code ctx}.
	 */
	@Override public T visitNode(@NotNull TreeFormatParser.NodeContext ctx) { return visitChildren(ctx); }

	/**
	 * {@inheritDoc}
	 * 

	 * The default implementation returns the result of calling
	 * {@link #visitChildren} on {@code ctx}.
	 */
	@Override public T visitSibling(@NotNull TreeFormatParser.SiblingContext ctx) { return visitChildren(ctx); }

	/**
	 * {@inheritDoc}
	 * 

	 * The default implementation returns the result of calling
	 * {@link #visitChildren} on {@code ctx}.
	 */
	@Override public T visitInformation(@NotNull TreeFormatParser.InformationContext ctx) { return visitChildren(ctx); }

	/**
	 * {@inheritDoc}
	 * 
	 * The default implementation returns the result of calling
	 * {@link #visitChildren} on {@code ctx}.
	 */
	@Override public T visitChild(@NotNull TreeFormatParser.ChildContext ctx) { return visitChildren(ctx); }
}