Move feed parsers packages in reader package

reader/json/parser.go

@@ -0,0 +1,24 @@
+// Copyright 2017 Frédéric Guillot. All rights reserved.
+// Use of this source code is governed by the Apache 2.0
+// license that can be found in the LICENSE file.
+
+package json
+
+import (
+	"encoding/json"
+	"io"
+
+	"github.com/miniflux/miniflux2/errors"
+	"github.com/miniflux/miniflux2/model"
+)
+
+// Parse returns a normalized feed struct from a JON feed.
+func Parse(data io.Reader) (*model.Feed, error) {
+	feed := new(jsonFeed)
+	decoder := json.NewDecoder(data)
+	if err := decoder.Decode(&feed); err != nil {
+		return nil, errors.NewLocalizedError("Unable to parse JSON Feed: %v", err)
+	}
+
+	return feed.Transform(), nil
+}