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package bjc.pratt.commands.impls;
import bjc.pratt.ParserContext;
import bjc.pratt.blocks.ParseBlock;
import bjc.pratt.commands.AbstractInitialCommand;
import bjc.pratt.commands.CommandResult;
import bjc.pratt.tokens.Token;
import bjc.data.Tree;
import bjc.data.SimpleTree;
import bjc.utils.parserutils.ParserException;
/**
* A grouping 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 GroupingCommand<K, V, C> extends AbstractInitialCommand<K, V, C> {
private final ParseBlock<K, V, C> innerBlock;
private final Token<K, V> mark;
/**
* Create a new grouping command.
*
* @param inner
* The inner block.
*
* @param marker
* The token to use as the node in the AST.
*/
public GroupingCommand(final ParseBlock<K, V, C> inner, final Token<K, V> marker) {
innerBlock = inner;
mark = marker;
}
@Override
protected CommandResult<K, V> intNullDenotation(final Token<K, V> operator, final ParserContext<K, V, C> ctx)
throws ParserException {
final CommandResult<K,V> resOpr = innerBlock.parse(ctx);
Tree<Token<K, V>> opr = resOpr.success();
return CommandResult.success(new SimpleTree<>(mark, opr));
}
}
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