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https://github.com/navidrome/navidrome.git
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0ab10e819f
Replaced the Fields() type switch with a fields() method on the Expression interface, eliminating the need to update a central switch when adding new expression types. Removed the now-redundant criteriaExpression() marker method since fields() alone suffices to restrict the interface. Extracted a conjunction interface for the ChildPlaylistIds() lookup used by All and Any.
38 lines
776 B
Go
38 lines
776 B
Go
package criteria
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import "fmt"
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type Visitor func(Expression) error
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func Walk(expr Expression, visit Visitor) error {
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if expr == nil {
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return nil
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}
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if err := visit(expr); err != nil {
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return err
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}
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switch e := expr.(type) {
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case All:
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for _, child := range e {
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if err := Walk(child, visit); err != nil {
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return err
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}
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}
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case Any:
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for _, child := range e {
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if err := Walk(child, visit); err != nil {
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return err
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}
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}
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case Is, IsNot, Gt, Lt, Before, After, Contains, NotContains, StartsWith, EndsWith, InTheRange, InTheLast, NotInTheLast, InPlaylist, NotInPlaylist:
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return nil
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default:
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return fmt.Errorf("unknown criteria expression type %T", expr)
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}
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return nil
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}
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func Fields(expr Expression) map[string]any {
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return expr.fields()
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}
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