Example #1
0
 void commaList(SqlWriter writer) {
   // The precedence of the comma operator if low but not zero. For
   // instance, this ensures parentheses in
   //    select x, (select * from foo order by z), y from t
   for (SqlNode node : list) {
     writer.sep(",");
     node.unparse(writer, 2, 3);
   }
 }
Example #2
0
  void andOrList(SqlWriter writer, SqlKind sepKind) {
    SqlBinaryOperator sepOp =
        sepKind == SqlKind.AND ? SqlStdOperatorTable.AND : SqlStdOperatorTable.OR;
    for (int i = 0; i < list.size(); i++) {
      SqlNode node = list.get(i);
      writer.sep(sepKind.name(), false);

      // The precedence pulling on the LHS of a node is the
      // right-precedence of the separator operator, except at the start
      // of the list; similarly for the RHS of a node. If the operator
      // has left precedence 4 and right precedence 5, the precedences
      // in a 3-node list will look as follows:
      //   0 <- node1 -> 4  5 <- node2 -> 4  5 <- node3 -> 0
      int lprec = (i == 0) ? 0 : sepOp.getRightPrec();
      int rprec = (i == (list.size() - 1)) ? 0 : sepOp.getLeftPrec();
      node.unparse(writer, lprec, rprec);
    }
  }
Example #3
0
 public void unparse(SqlWriter writer, int leftPrec, int rightPrec) {
   final SqlWriter.Frame frame =
       ((leftPrec > 0) || (rightPrec > 0)) ? writer.startList("(", ")") : writer.startList("", "");
   commaList(writer);
   writer.endList(frame);
 }