package water.rapids.ast.prims.mungers;
import water.fvec.Frame;
import water.rapids.Env;
import water.rapids.Val;
import water.rapids.vals.ValNum;
import water.rapids.ast.AstPrimitive;
import water.rapids.ast.AstRoot;
/**
*/
public class AstNcol extends AstPrimitive {
@Override
public String[] args() {
return new String[]{"ary"};
}
@Override
public int nargs() {
return 1 + 1;
}
@Override
public String str() {
return "ncol";
}
@Override
public ValNum apply(Env env, Env.StackHelp stk, AstRoot asts[]) {
Frame fr = stk.track(asts[1].exec(env)).getFrame();
return new ValNum(fr.numCols());
}
}