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package bjc.pratt.commands;
import bjc.pratt.ParserContext;
import bjc.pratt.commands.CommandResult.Status;
import bjc.pratt.tokens.Token;
import bjc.data.Tree;
import bjc.data.SimpleTree;
import bjc.utils.parserutils.ParserException;
/**
* A binary operator.
*
* @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 BinaryCommand<K, V, C> extends BinaryPostCommand<K, V, C> {
/**
* Create a new binary operator with the specified precedence.
*
* @param precedence
* The precedence of the operator.
*/
public BinaryCommand(final int precedence) {
super(precedence);
}
/**
* The right-binding power (right-precedence) of this command.
*
* @return The right binding power of this command.
*/
protected abstract int rightBinding();
@Override
public CommandResult<K, V> denote(final Tree<Token<K, V>> operand,
final Token<K, V> operator, final ParserContext<K, V, C> ctx)
throws ParserException {
final CommandResult<K,V> opr
= ctx.parse.parseExpression(rightBinding(), ctx.tokens, ctx.state, false);
if (opr.status != Status.SUCCESS) return opr;
return CommandResult.success(new SimpleTree<>(operator, operand, opr.success()));
}
}
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