[ao3] parse 'series' metadata (#6013)

gallery_dl/extractor/ao3.py

@@ -116,6 +116,19 @@ class Ao3WorkExtractor(Ao3Extractor):
         }
         data["language"] = util.code_to_language(data["lang"])
 
+        series = data["series"]
+        if series:
+            extr = text.extract_from(series)
+            data["series"] = {
+                "prev" : extr(' class="previous" href="/works/', '"'),
+                "index": extr(' class="position">Part ', " "),
+                "id"   : extr(' href="/series/', '"'),
+                "name" : text.unescape(extr(">", "<")),
+                "next" : extr(' class="next" href="/works/', '"'),
+            }
+        else:
+            data["series"] = None
+
         yield Message.Directory, data
         for fmt in self.formats:
             try:

test/results/ao3.py

@@ -25,6 +25,13 @@ __tests__ = (
     "lang"     : "en",
     "language" : "English",
     "likes"    : range(1000, 2000),
+    "series"   : {
+        "id"   : "4237024",
+        "prev" : "",
+        "next" : "57205801",
+        "index": "1",
+        "name" : "The Wildcard Universe",
+    },
     "title"    : "The Wildcard",
     "views"    : range(34000, 50000),
     "words"    : 217549,
@@ -172,6 +179,7 @@ __tests__ = (
     "#category": ("", "ao3", "user-works"),
     "#class"   : ao3.Ao3UserWorksExtractor,
     "#urls"    : (
+        "https://archiveofourown.org/works/58979287",
         "https://archiveofourown.org/works/55035061",
         "https://archiveofourown.org/works/52704457",
         "https://archiveofourown.org/works/52502743",