Function Walk

query/expr/ast.go:531–566

Walk traverses an expression hierarchy in depth-first order.

(v Visitor, expr Expr)

// Walk traverses an expression hierarchy in depth-first order.
func Walk(v Visitor, expr Expr) {
	if expr == nil {
		return
	}

	if v = v.Visit(expr); v == nil {
		return
	}

	switch e := expr.(type) {
	case *UnaryExpr:
		Walk(v, e.Expr)

	case *BinaryExpr:
		Walk(v, e.LHS)
		Walk(v, e.RHS)

	case *Case:
		for _, cond := range e.WhenThens {
			Walk(v, cond.When)
			Walk(v, cond.Then)
		}
		if e.Else != nil {
			Walk(v, e.Else)
		}

	case *Call:
		for _, expr := range e.Args {
			Walk(v, expr)
		}

	case *ParenExpr:
		Walk(v, e.Expr)

	}
}

// WalkFunc traverses an expression hierarchy in depth-first order.
func WalkFunc(e Expr, fn func(Expr)) {