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package bjc.pratt.commands;
import bjc.pratt.ParseBlock;
import bjc.pratt.ParserContext;
import bjc.pratt.Token;
import bjc.utils.data.ITree;
import bjc.utils.data.Tree;
import bjc.utils.parserutils.ParserException;
/**
* A prefix ternary operator, like an if/then/else group.
*
* @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 PreTernaryCommand<K, V, C> extends AbstractInitialCommand<K, V, C> {
private Token<K, V> term;
private ParseBlock<K, V, C> condBlock;
private ParseBlock<K, V, C> opblock1;
private ParseBlock<K, V, C> opblock2;
/**
* Create a new ternary statement.
*
* @param cond
* The block for handling the condition.
*
* @param op1
* The block for handling the first operator.
*
* @param op2
* The block for handling the second operator.
*
* @param term
* The token to use as the node for the AST.
*/
public PreTernaryCommand(ParseBlock<K, V, C> cond, ParseBlock<K, V, C> op1, ParseBlock<K, V, C> op2,
Token<K, V> term) {
super();
if (cond == null)
throw new NullPointerException("Cond block must not be null");
else if (op1 == null)
throw new NullPointerException("Op block #1 must not be null");
else if (op2 == null) throw new NullPointerException("Op block #2 must not be null");
this.condBlock = cond;
this.opblock1 = op1;
this.opblock2 = op2;
this.term = term;
}
@Override
protected ITree<Token<K, V>> intNullDenotation(Token<K, V> operator, ParserContext<K, V, C> ctx)
throws ParserException {
ITree<Token<K, V>> cond = condBlock.parse(ctx);
ITree<Token<K, V>> op1 = opblock1.parse(ctx);
ITree<Token<K, V>> op2 = opblock2.parse(ctx);
return new Tree<>(term, cond, op1, op2);
}
}
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