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);
}
}
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);
}
}
public void unparse(SqlWriter writer, SqlNode[] operands, int leftPrec, int rightPrec) {
assert operands.length >= 2;
final SqlWriter.Frame frame = writer.startList(SqlWriter.FrameTypeEnum.Simple);
operands[0].unparse(writer, leftPrec, getLeftPrec());
final boolean needsSpace = true;
writer.setNeedWhitespace(needsSpace);
writer.sep("AS");
writer.setNeedWhitespace(needsSpace);
operands[1].unparse(writer, getRightPrec(), rightPrec);
if (operands.length > 2) {
final SqlWriter.Frame frame1 = writer.startList(SqlWriter.FrameTypeEnum.Simple, "(", ")");
for (int i = 2; i < operands.length; i++) {
SqlNode operand = operands[i];
writer.sep(",", false);
operand.unparse(writer, 0, 0);
}
writer.endList(frame1);
}
writer.endList(frame);
}