1 files changed, 31 insertions, 4 deletions
diff --git a/gallery_dl/util.py b/gallery_dl/util.py
index 6cdd994..3cbe510 100644
--- a/gallery_dl/util.py
+++ b/gallery_dl/util.py
@@ -21,6 +21,7 @@ import datetime
 import functools
 import itertools
 import subprocess
+import collections
 import urllib.parse
 from http.cookiejar import Cookie
 from email.utils import mktime_tz, parsedate_tz
@@ -702,6 +703,28 @@ def compile_expression_raw(expr, name="<expr>", globals=None):
     return functools.partial(eval, code_object, globals or GLOBALS)
 
 
+def compile_expression_defaultdict(expr, name="<expr>", globals=None):
+    global GLOBALS_DEFAULT
+
+    if isinstance(__builtins__, dict):
+        # cpython
+        GLOBALS_DEFAULT = collections.defaultdict(lambda n=NONE: n, GLOBALS)
+    else:
+        # pypy3 - insert __builtins__ symbols into globals dict
+        GLOBALS_DEFAULT = collections.defaultdict(
+            lambda n=NONE: n, __builtins__.__dict__)
+        GLOBALS_DEFAULT.update(GLOBALS)
+
+    global compile_expression_defaultdict
+    compile_expression_defaultdict = compile_expression_defaultdict_impl
+    return compile_expression_defaultdict_impl(expr, name, globals)
+
+
+def compile_expression_defaultdict_impl(expr, name="<expr>", globals=None):
+    code_object = compile(expr, name, "eval")
+    return functools.partial(eval, code_object, globals or GLOBALS_DEFAULT)
+
+
 def compile_expression_tryexcept(expr, name="<expr>", globals=None):
     code_object = compile(expr, name, "eval")
 
@@ -711,7 +734,7 @@ def compile_expression_tryexcept(expr, name="<expr>", globals=None):
         except exception.GalleryDLException:
             raise
         except Exception:
-            return False
+            return NONE
 
     return _eval
 
@@ -719,6 +742,12 @@ def compile_expression_tryexcept(expr, name="<expr>", globals=None):
 compile_expression = compile_expression_tryexcept
 
 
+def compile_filter(expr, name="<filter>", globals=None):
+    if not isinstance(expr, str):
+        expr = "(" + ") and (".join(expr) + ")"
+    return compile_expression(expr, name, globals)
+
+
 def import_file(path):
     """Import a Python module from a filesystem path"""
     path, name = os.path.split(path)
@@ -949,10 +978,8 @@ class FilterPredicate():
     """Predicate; True if evaluating the given expression returns True"""
 
     def __init__(self, expr, target="image"):
-        if not isinstance(expr, str):
-            expr = "(" + ") and (".join(expr) + ")"
         name = "<{} filter>".format(target)
-        self.expr = compile_expression(expr, name)
+        self.expr = compile_filter(expr, name)
 
     def __call__(self, _, kwdict):
         try: