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package metricsql
// ExpandWithExprs expands WITH expressions inside q and returns the resulting
// PromQL without WITH expressions.
func ExpandWithExprs(q string) (string, error) {
e, err := Parse(q)
if err != nil {
return "", err
}
buf := e.AppendString(nil)
return string(buf), nil
}
// VisitAll recursively calls f for all the Expr children in e.
//
// It visits leaf children at first and then visits parent nodes.
// It is safe modifying expr in f.
func VisitAll(e Expr, f func(expr Expr)) {
switch expr := e.(type) {
case *BinaryOpExpr:
VisitAll(expr.Left, f)
VisitAll(expr.Right, f)
VisitAll(&expr.GroupModifier, f)
VisitAll(&expr.JoinModifier, f)
case *FuncExpr:
for _, arg := range expr.Args {
VisitAll(arg, f)
}
case *AggrFuncExpr:
for _, arg := range expr.Args {
VisitAll(arg, f)
}
VisitAll(&expr.Modifier, f)
case *RollupExpr:
VisitAll(expr.Expr, f)
}
f(e)
}
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