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package bjc.pratt.commands.impls;
import bjc.pratt.ParserContext;
import bjc.pratt.commands.CommandResult;
import bjc.pratt.commands.InitialCommand;
import bjc.pratt.tokens.Token;
import bjc.data.Tree;
import bjc.utils.parserutils.ParserException;
/**
* A command that represents a specific tree.
*
* @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 ConstantCommand<K, V, C> implements InitialCommand<K, V, C> {
private final Tree<Token<K, V>> val;
/**
* Create a new constant.
*
* @param con
* The tree this constant represents.
*/
public ConstantCommand(final Tree<Token<K, V>> con) {
val = con;
}
@Override
public CommandResult<K, V> denote(final Token<K, V> operator, final ParserContext<K, V, C> ctx)
throws ParserException {
return CommandResult.success(val);
}
}
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