Reduce Python 2.5- grammar rules

__pkginfo__.py

@@ -39,7 +39,7 @@ entry_points       = {
         'pydisassemble=uncompyle6.bin.pydisassemble:main',
     ]}
 ftp_url            = None
-install_requires   = ['spark-parser >= 1.8.0, < 1.9.0',
+install_requires   = ['spark-parser >= 1.8.2, < 1.9.0',
                       'xdis >= 3.6.1, < 3.7.0']
 license            = 'MIT'
 mailing_list       = 'python-debugger@googlegroups.com'

test-unit/test_grammar.py

@@ -0,0 +1,55 @@
+import re
+import unittest
+from uncompyle6 import PYTHON_VERSION, IS_PYPY # , PYTHON_VERSION
+from uncompyle6.parser import get_python_parser, python_parser
+
+class TestGrammar(unittest.TestCase):
+    def test_grammar(self):
+
+        def check_tokens(tokens, opcode_set):
+            remain_tokens = set(tokens) - opcode_set
+            remain_tokens = set([re.sub('_\d+$','', t) for t in remain_tokens])
+            remain_tokens = set([re.sub('_CONT$','', t) for t in remain_tokens])
+            remain_tokens = set(remain_tokens) - opcode_set
+            self.assertEqual(remain_tokens, set([]),
+                    "Remaining tokens %s\n====\n%s" % (remain_tokens, p.dump_grammar()))
+
+        p = get_python_parser(PYTHON_VERSION, is_pypy=IS_PYPY)
+        (lhs, rhs, tokens,
+         right_recursive, dup_rhs) = p.check_sets()
+        expect_lhs = set(['expr1024', 'pos_arg'])
+        unused_rhs = set(['build_list', 'call_function', 'mkfunc',
+                          'mklambda',
+                          'unpack',])
+
+        expect_right_recursive = frozenset([('designList',
+                                             ('designator', 'DUP_TOP', 'designList'))])
+        expect_lhs.add('kwarg')
+
+        self.assertEqual(expect_lhs, set(lhs))
+        self.assertEqual(unused_rhs, set(rhs))
+        self.assertEqual(expect_right_recursive, right_recursive)
+
+        expect_dup_rhs = frozenset([('COME_FROM',), ('CONTINUE',), ('JUMP_ABSOLUTE',),
+                                    ('LOAD_CONST',),
+                                    ('JUMP_BACK',), ('JUMP_FORWARD',)])
+
+        reduced_dup_rhs = {}
+        for k in dup_rhs:
+            if k not in expect_dup_rhs:
+                reduced_dup_rhs[k] = dup_rhs[k]
+                pass
+            pass
+        for k in reduced_dup_rhs:
+            print(k, reduced_dup_rhs[k])
+        # assert not reduced_dup_rhs, reduced_dup_rhs
+
+    def test_dup_rule(self):
+        import inspect
+        python_parser(PYTHON_VERSION, inspect.currentframe().f_code,
+                      is_pypy=IS_PYPY,
+                      parser_debug={
+                          'dups': True, 'transition': False, 'reduce': False,
+                          'rules': False, 'errorstack': None, 'context': True})
+if __name__ == '__main__':
+    unittest.main()

uncompyle6/parsers/parse2.py

@@ -108,6 +108,7 @@ class Python2Parser(PythonParser):
         buildclass ::= LOAD_CONST expr mkfunc
                      CALL_FUNCTION_0 BUILD_CLASS
 
+        # Class decorators starting in 2.6
         stmt          ::= classdefdeco
         classdefdeco  ::= classdefdeco1 designator
         classdefdeco1 ::= expr classdefdeco1 CALL_FUNCTION_1

uncompyle6/parsers/parse25.py

@@ -50,7 +50,7 @@ class Python25Parser(Python26Parser):
         """
 
     def add_custom_rules(self, tokens, customize):
-        # grammar rules inherited from Python 2.6
+        # Remove grammar rules inherited from Python 2.6 or Python 2
         self.remove_rules("""
         setupwith  ::= DUP_TOP LOAD_ATTR ROT_TWO LOAD_ATTR CALL_FUNCTION_0 POP_TOP
         withstmt   ::= expr setupwith SETUP_FINALLY suite_stmts_opt
@@ -58,6 +58,19 @@ class Python25Parser(Python26Parser):
         withasstmt ::= expr setupwithas designator suite_stmts_opt
                        POP_BLOCK LOAD_CONST COME_FROM WITH_CLEANUP END_FINALLY
         assert2       ::= assert_expr jmp_true LOAD_ASSERT expr CALL_FUNCTION_1 RAISE_VARARGS_1
+        stmt          ::= classdefdeco
+        classdefdeco  ::= classdefdeco1 designator
+        classdefdeco1 ::= expr classdefdeco1 CALL_FUNCTION_1
+        classdefdeco1 ::= expr classdefdeco2 CALL_FUNCTION_1
+        classdefdeco2 ::= LOAD_CONST expr mkfunc CALL_FUNCTION_0 BUILD_CLASS
+        mkfuncdeco ::= expr mkfuncdeco CALL_FUNCTION_1
+        ret_cond ::= expr jmp_false_then expr RETURN_END_IF POP_TOP ret_expr_or_cond
+        return_if_stmt ::= ret_expr RETURN_END_IF POP_TOP
+        return_if_stmts ::= return_if_stmt
+        return_stmt ::= ret_expr RETURN_END_IF POP_TOP
+        return_stmt ::= ret_expr RETURN_VALUE POP_TOP
+        stmt ::= conditional_lambda
+        setupwithas      ::= DUP_TOP LOAD_ATTR ROT_TWO LOAD_ATTR CALL_FUNCTION_0 setup_finally
         """)
         super(Python25Parser, self).add_custom_rules(tokens, customize)
         if self.version == 2.5:

uncompyle6/parsers/parse26.py

@@ -72,8 +72,6 @@ class Python26Parser(Python2Parser):
         jmp_true     ::= JUMP_IF_TRUE POP_TOP
         jmp_false    ::= JUMP_IF_FALSE POP_TOP
 
-        jf_pop       ::= JUMP_FORWARD POP_TOP
-        jf_pop       ::= JUMP_ABSOLUTE POP_TOP
         jb_pop       ::= JUMP_BACK POP_TOP
 
         jb_cont      ::= JUMP_BACK