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package com.ashardalon.pratt.commands;
import com.ashardalon.pratt.ParserContext;
import com.ashardalon.pratt.tokens.Token;
import bjc.utils.parserutils.ParserException;
/**
* Abstract base for initial commands.
*
* @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 abstract class AbstractInitialCommand<K, V, C> implements InitialCommand<K, V, C> {
@Override
public CommandResult<K, V> denote(final Token<K, V> operator,
final ParserContext<K, V, C> ctx) throws ParserException {
return intNullDenotation(operator, ctx);
}
/**
* Internal null denotation method.
*
* @param operator
* The operator that was parsed.
* @param ctx
* The parser context at this point.
*
* @return The tree that this method parsed.
*
* @throws ParserException
* If something went wrong while parsing.
*/
protected abstract CommandResult<K, V> intNullDenotation(Token<K, V> operator,
ParserContext<K, V, C> ctx) throws ParserException;
}
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