Support for unquoted values, Fixes #6

Author: peterhellberg

link.go

@@ -12,7 +12,7 @@ var (
 	equalRegexp      = regexp.MustCompile(` *= *`)
 	keyRegexp        = regexp.MustCompile(`[a-z*]+`)
 	linkRegexp       = regexp.MustCompile(`\A<(.+)>;(.+)\z`)
-	semiRegexp       = regexp.MustCompile(`; +`)
+	semiRegexp       = regexp.MustCompile(`;\s{0,}`)
 	valRegexp        = regexp.MustCompile(`"+([^"]+)"+`)
 )
 
@@ -86,15 +86,14 @@ func Parse(s string) Group {
 				continue
 			}
 
+			val := strings.TrimSpace(vals[1])
 			key := keyRegexp.FindString(vals[0])
 			vsm := valRegexp.FindStringSubmatch(vals[1])
 
-			if len(vsm) != 2 {
-				continue
+			if len(vsm) == 2 {
+				val = vsm[1]
 			}
 
-			val := vsm[1]
-
 			if key == "rel" {
 				vals := strings.Split(val, " ")
 				rels := []string{vals[0]}

link_test.go

@@ -301,6 +301,36 @@ func TestParse_rfc5988Example4(t *testing.T) {
 	}
 }
 
+func TestParse_noQuotesExample(t *testing.T) {
+	g := Parse(`</example.png>;rel=preload;as=image`)
+
+	if got, want := len(g), 1; got != want {
+		t.Fatalf(`len(g) = %d, want %d`, got, want)
+	}
+
+	if g["preload"] == nil {
+		t.Fatalf(`g["preload"] == nil`)
+	}
+
+	l := *g["preload"]
+
+	if got, want := l.URI, "/example.png"; got != want {
+		t.Fatalf("l.URI = %q, want = %q", got, want)
+	}
+
+	if got, want := l.Rel, "preload"; got != want {
+		t.Fatalf("l.Rel = %q, want = %q", got, want)
+	}
+
+	if l.Extra == nil {
+		t.Fatalf("l.Extra == nil")
+	}
+
+	if got, want := l.Extra["as"], "image"; got != want {
+		t.Fatalf("l.Extra[\"as\"] = %q, want %q", got, want)
+	}
+}
+
 func TestParse_fuzzCrashers(t *testing.T) {
 	t.Parallel()