package filter import ( "github.com/Necoro/gofeed" "github.com/antonmedv/expr" "github.com/antonmedv/expr/vm" ) type Filter struct { prog *vm.Program } func (f *Filter) Run(item *gofeed.Item) (bool, error) { if res, err := expr.Run(f.prog, item); err != nil { return false, err } else { return res.(bool), nil } } func New(s string) (*Filter, error) { prog, err := expr.Compile(s, expr.AsBool(), expr.Env(gofeed.Item{})) if err != nil { return nil, err } return &Filter{prog}, nil }