mmcdole#151: Add atom namespaces to known namespaces

go.mod

@@ -21,5 +21,6 @@ require (
 	github.com/pmezard/go-difflib v1.0.0 // indirect
 	github.com/russross/blackfriday/v2 v2.0.1 // indirect
 	github.com/shurcooL/sanitized_anchor_name v1.0.0 // indirect
+	golang.org/x/exp v0.0.0-20240707233637-46b078467d37
 	gopkg.in/yaml.v3 v3.0.1 // indirect
 )

go.sum

@@ -34,6 +34,8 @@ github.com/stretchr/testify v1.8.1 h1:w7B6lhMri9wdJUVmEZPGGhZzrYTPvgJArz7wNPgYKs
 github.com/stretchr/testify v1.8.1/go.mod h1:w2LPCIKwWwSfY2zedu0+kehJoqGctiVI29o6fzry7u4=
 github.com/urfave/cli v1.22.3 h1:FpNT6zq26xNpHZy08emi755QwzLPs6Pukqjlc7RfOMU=
 github.com/urfave/cli v1.22.3/go.mod h1:Gos4lmkARVdJ6EkW0WaNv/tZAAMe9V7XWyB60NtXRu0=
+golang.org/x/exp v0.0.0-20240707233637-46b078467d37 h1:uLDX+AfeFCct3a2C7uIWBKMJIR3CJMhcgfrUAqjRK6w=
+golang.org/x/exp v0.0.0-20240707233637-46b078467d37/go.mod h1:M4RDyNAINzryxdtnbRXRL/OHtkFuWGRjvuhBJpk2IlY=
 golang.org/x/net v0.0.0-20210916014120-12bc252f5db8/go.mod h1:9nx3DQGgdP8bBQD5qxJ1jj9UTztislL4KSBs9R2vV5Y=
 golang.org/x/net v0.4.0 h1:Q5QPcMlvfxFTAPV0+07Xz/MpK9NTXu2VDUuy0FeMfaU=
 golang.org/x/net v0.4.0/go.mod h1:MBQ8lrhLObU/6UmLb4fmbmk5OcyYmqtbGd/9yIeKjEE=

internal/shared/extparser.go

@@ -3,17 +3,31 @@ package shared
 import (
 	"strings"
 
-	"github.com/mmcdole/gofeed/extensions"
-	"github.com/mmcdole/goxpp"
+	ext "github.com/mmcdole/gofeed/extensions"
+	xpp "github.com/mmcdole/goxpp"
+	"golang.org/x/exp/slices"
 )
 
+var knownPrefixes = []string{
+	"rss",
+	"rdf",
+	"content",
+	"atom",
+	"atom03",
+}
+
 // IsExtension returns whether or not the current
 // XML element is an extension element (if it has a
 // non empty prefix)
 func IsExtension(p *xpp.XMLPullParser) bool {
 	space := strings.TrimSpace(p.Space)
 	prefix := PrefixForNamespace(space, p)
-	return !(prefix == "" || prefix == "rss" || prefix == "rdf" || prefix == "content")
+
+	if prefix == "" {
+		return false
+	}
+
+	return !slices.Contains(knownPrefixes, prefix)
 }
 
 // ParseExtension parses the current element of the
@@ -118,6 +132,8 @@ func PrefixForNamespace(space string, p *xpp.XMLPullParser) string {
 // These canonical prefixes override any prefixes used in the feed itself.
 var canonicalNamespaces = map[string]string{
 	"http://webns.net/mvcb/":                                         "admin",
+	"http://www.w3.org/2005/Atom":                                    "atom",
+	"http://purl.org/atom/ns#":                                       "atom03",
 	"http://purl.org/rss/1.0/modules/aggregation/":                   "ag",
 	"http://purl.org/rss/1.0/modules/annotate/":                      "annotate",
 	"http://media.tangent.org/rss/1.0/":                              "audio",