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package bjc.utils.parserutils.pratt.commands;
import bjc.utils.data.ITree;
import bjc.utils.data.Tree;
import bjc.utils.parserutils.ParserException;
import bjc.utils.parserutils.pratt.ParserContext;
import bjc.utils.parserutils.pratt.Token;
/**
* A unary 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 class UnaryCommand<K, V, C> extends AbstractInitialCommand<K, V, C> {
private final int nullPwer;
/**
* Create a new unary command.
*
* @param precedence
* The precedence of this operator.
*/
public UnaryCommand(int precedence) {
if(precedence < 0) {
throw new IllegalArgumentException("Precedence must be non-negative");
}
nullPwer = precedence;
}
@Override
protected ITree<Token<K, V>> intNullDenotation(Token<K, V> operator, ParserContext<K, V, C> ctx)
throws ParserException {
ITree<Token<K, V>> opr = ctx.parse.parseExpression(nullPwer, ctx.tokens, ctx.state, false);
return new Tree<>(operator, opr);
}
}
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