[jsinterp] Fix bug in operator precedence

* from https://github.com/yt-dlp/yt-dlp/commit/164b03c4864b0d44cfee5e7702f7c2317164a6cf
* added tests

3 files changed, 35 insertions, 1 deletions

diff --git a/test/test_jsinterp.py b/test/test_jsinterp.py
index 96786a84c..0a97bdbc4 100644
--- a/test/test_jsinterp.py
+++ b/test/test_jsinterp.py
@@ -192,6 +192,31 @@ class TestJSInterpreter(unittest.TestCase):
         ''')
         self.assertEqual(jsi.call_function('x'), 10)
 
+    def test_catch(self):
+        jsi = JSInterpreter('''
+        function x() { try{throw 10} catch(e){return 5} }
+        ''')
+        self.assertEqual(jsi.call_function('x'), 5)
+
+    @unittest.expectedFailure
+    def test_finally(self):
+        jsi = JSInterpreter('''
+        function x() { try{throw 10} finally {return 42} }
+        ''')
+        self.assertEqual(jsi.call_function('x'), 42)
+        jsi = JSInterpreter('''
+        function x() { try{throw 10} catch(e){return 5} finally {return 42} }
+        ''')
+        self.assertEqual(jsi.call_function('x'), 42)
+
+    def test_nested_try(self):
+        jsi = JSInterpreter('''
+        function x() {try {
+            try{throw 10} finally {throw 42} 
+            } catch(e){return 5} }
+        ''')
+        self.assertEqual(jsi.call_function('x'), 5)
+
     def test_for_loop_continue(self):
         jsi = JSInterpreter('''
         function x() { a=0; for (i=0; i-10; i++) { continue; a++ } return a }
diff --git a/test/test_youtube_signature.py b/test/test_youtube_signature.py
index 327d4c40d..4bb0a30b0 100644
--- a/test/test_youtube_signature.py
+++ b/test/test_youtube_signature.py
@@ -111,6 +111,10 @@ _NSIG_TESTS = [
         'https://www.youtube.com/s/player/1f7d5369/player_ias.vflset/en_US/base.js',
         'batNX7sYqIJdkJ', 'IhOkL_zxbkOZBw',
     ),
+    (
+        'https://www.youtube.com/s/player/dc0c6770/player_ias.vflset/en_US/base.js',
+        '5EHDMgYLV6HPGk_Mu-kk', 'n9lUJLHbxUI0GQ',
+    ),
 ]
 
 
diff --git a/youtube_dl/jsinterp.py b/youtube_dl/jsinterp.py
index 6719d0dfd..a8456ec1c 100644
--- a/youtube_dl/jsinterp.py
+++ b/youtube_dl/jsinterp.py
@@ -5,6 +5,7 @@ import json
 import math
 import operator
 import re
+from collections import Counter
 
 from .utils import (
     error_to_compat_str,
@@ -108,8 +109,8 @@ _OPERATORS = (
 
 _COMP_OPERATORS = (
     ('===', operator.is_),
-    ('==', _js_eq_op(operator.eq)),
     ('!==', operator.is_not),
+    ('==', _js_eq_op(operator.eq)),
     ('!=', _js_eq_op(operator.ne)),
     ('<=', _js_comp_op(operator.le)),
     ('>=', _js_comp_op(operator.ge)),
@@ -241,7 +242,9 @@ class JSInterpreter(object):
     def _separate(cls, expr, delim=',', max_split=None, skip_delims=None):
         if not expr:
             return
+        # collections.Counter() is ~10% slower
         counters = {k: 0 for k in _MATCHING_PARENS.values()}
+        # counters = Counter()
         start, splits, pos, delim_len = 0, 0, 0, len(delim) - 1
         in_quote, escaping, skipping = None, False, 0
         after_op, in_regex_char_group, skip_re = True, False, 0
@@ -442,6 +445,7 @@ class JSInterpreter(object):
             return ret, should_abort or should_return
 
         elif md.get('catch'):
+
             catch_expr, expr = self._separate_at_paren(expr[m.end():], '}')
             if self._EXC_NAME in local_vars:
                 catch_vars = local_vars.new_child({m.group('err'): local_vars.pop(self._EXC_NAME)})
@@ -450,6 +454,7 @@ class JSInterpreter(object):
                     return ret, True
 
             ret, should_abort = self.interpret_statement(expr, local_vars, allow_recursion)
+
             return ret, should_abort or should_return
 
         elif md.get('for'):