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package com.ashardalon.pratt.commands;
import com.ashardalon.pratt.ParserContext;
import com.ashardalon.pratt.tokens.Token;
import bjc.data.Tree;
import bjc.utils.parserutils.ParserException;
/**
* Represents a non-initial command in parsing.
*
* @author EVE
*
* @param <K>
* The key type for the tokens.
*
* @param <V>
* The value type for the tokens.
*
* @param <C>
* The state type of the parser.
*
*/
public abstract class NonInitialCommand<K, V, C> {
/**
* Construct the left denotation of this command.
*
* @param operand
* The left-hand operand of this command.
* @param operator
* The operator for this command.
*
* @param ctx
* The state needed for commands.
*
* @return The result of executing the command.
*
* @throws ParserException
* If something went wrong during parsing.
*/
public abstract CommandResult<K, V> denote(Tree<Token<K, V>> operand, Token<K, V> operator,
ParserContext<K, V, C> ctx) throws ParserException;
/**
* Get the left-binding power of this command.
*
* This represents the general precedence of this command.
*
* @return The left-binding power of this command.
*/
public abstract int leftBinding();
/**
* Get the next-binding power of this command.
*
* This represents the highest precedence of command this command can be
* the left operand of.
*
* This is the same as the left-binding power by default.
*
* @return The next-binding power of this command.
*/
public int nextBinding() {
return leftBinding();
}
}
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