1 files changed, 28 insertions, 0 deletions
diff --git a/youtube_dl/utils.py b/youtube_dl/utils.py
index f8ec5389f..42ad520f9 100644
--- a/youtube_dl/utils.py
+++ b/youtube_dl/utils.py
@@ -1474,6 +1474,34 @@ def strip_jsonp(code):
     return re.sub(r'(?s)^[a-zA-Z0-9_]+\s*\(\s*(.*)\);?\s*?\s*$', r'\1', code)
 
 
+def js_to_json(code):
+    def fix_kv(m):
+        key = m.group(2)
+        if key.startswith("'"):
+            assert key.endswith("'")
+            assert '"' not in key
+            key = '"%s"' % key[1:-1]
+        elif not key.startswith('"'):
+            key = '"%s"' % key
+
+        value = m.group(4)
+        if value.startswith("'"):
+            assert value.endswith("'")
+            assert '"' not in value
+            value = '"%s"' % value[1:-1]
+
+        return m.group(1) + key + m.group(3) + value
+
+    res = re.sub(r'''(?x)
+            ([{,]\s*)
+            ("[^"]*"|\'[^\']*\'|[a-z0-9A-Z]+)
+            (:\s*)
+            ([0-9.]+|true|false|"[^"]*"|\'[^\']*\'|\[|\{)
+        ''', fix_kv, code)
+    res = re.sub(r',(\s*\])', lambda m: m.group(1), res)
+    return res
+
+
 def qualities(quality_ids):
     """ Get a numeric quality value out of a list of possible values """
     def q(qid):