1 files changed, 27 insertions, 0 deletions
diff --git a/internal/feed/filter/filter.go b/internal/feed/filter/filter.go
new file mode 100644
index 0000000..8ff8a97
--- /dev/null
+++ b/internal/feed/filter/filter.go
@@ -0,0 +1,27 @@
+package filter
+
+import (
+	"github.com/antonmedv/expr"
+	"github.com/antonmedv/expr/vm"
+	"github.com/mmcdole/gofeed"
+)
+
+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
+}