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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;
public class TernaryCommand<K, V, C> extends BinaryPostCommand<K, V, C> {
private K term;
private int innerExp;
private Token<K, V> mark;
private boolean nonassoc;
public TernaryCommand(int leftPower, K terminator, Token<K, V> marker, boolean isNonassoc) {
super(leftPower);
term = terminator;
mark = marker;
nonassoc = isNonassoc;
}
@SuppressWarnings("unchecked")
@Override
public ITree<Token<K, V>> denote(ITree<Token<K, V>> operand, Token<K, V> operator,
ParserContext<K, V, C> ctx) throws ParserException {
ITree<Token<K, V>> inner = ctx.parse.parseExpression(innerExp, ctx.tokens, ctx.state, false);
ctx.tokens.expect(term);
ITree<Token<K, V>> outer = ctx.parse.parseExpression(1 + leftBinding(), ctx.tokens, ctx.state, false);
return new Tree<>(mark, inner, operand, outer);
}
@Override
public int nextBinding() {
if (nonassoc) {
return leftBinding() - 1;
} else {
return leftBinding();
}
}
}
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