Move feed parsers packages in reader package

reader/atom/parser.go

@@ -0,0 +1,29 @@
+// 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 atom
+
+import (
+	"encoding/xml"
+	"io"
+
+	"github.com/miniflux/miniflux2/errors"
+	"github.com/miniflux/miniflux2/model"
+
+	"golang.org/x/net/html/charset"
+)
+
+// Parse returns a normalized feed struct from a Atom feed.
+func Parse(data io.Reader) (*model.Feed, error) {
+	atomFeed := new(atomFeed)
+	decoder := xml.NewDecoder(data)
+	decoder.CharsetReader = charset.NewReaderLabel
+
+	err := decoder.Decode(atomFeed)
+	if err != nil {
+		return nil, errors.NewLocalizedError("Unable to parse Atom feed: %v.", err)
+	}
+
+	return atomFeed.Transform(), nil
+}