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package bjc.utils.parserutils.pratt.commands;
import bjc.utils.data.ITree;
import bjc.utils.parserutils.ParserException;
import bjc.utils.parserutils.pratt.InitialCommand;
import bjc.utils.parserutils.pratt.ParserContext;
import bjc.utils.parserutils.pratt.Token;
/**
* A command that denests a input tree.
*
* Useful for processing the result of passing a complex parse group to a
* command.
*
* @author bjculkin
*
* @param <K>
* The key type of the tokens.
*
* @param <V>
* The value type of the tokens.
*
* @param <C>
* The state type of the parser.
*
*/
public class DenestingCommand<K, V, C> extends AbstractInitialCommand<K, V, C> {
private InitialCommand<K, V, C> wrapped;
/**
* Create a new transforming initial command.
*
* @param internal
* The initial command to delegate to.
*/
public DenestingCommand(InitialCommand<K, V, C> internal) {
wrapped = internal;
}
@Override
protected ITree<Token<K, V>> intNullDenotation(Token<K, V> operator, ParserContext<K, V, C> ctx)
throws ParserException {
return wrapped.denote(operator, ctx).getChild(0);
}
}
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