Sync with decompyle3

Author: rocky

uncompyle6/semantics/pysource.py

@@ -134,7 +134,7 @@
 from typing import Optional
 
 from spark_parser import GenericASTTraversal
-from xdis import COMPILER_FLAG_BIT, iscode
+from xdis import COMPILER_FLAG_BIT, IS_PYPY, iscode
 from xdis.version_info import PYTHON_VERSION_TRIPLE
 
 from uncompyle6.parser import get_python_parser, parse
@@ -149,6 +149,7 @@
     MAP,
     MAP_DIRECT,
     NAME_MODULE,
+    NO_PARENTHESIS_EVER,
     NONE,
     PASS,
     PRECEDENCE,
@@ -189,8 +190,6 @@ def unicode(x):
     "dups": False,
 }
 
-IS_PYPY = "__pypy__" in sys.builtin_module_names
-
 TREE_DEFAULT_DEBUG = {"before": False, "after": False}
 
 DEFAULT_DEBUG_OPTS = {
@@ -210,7 +209,7 @@ def __str__(self):
 
 class SourceWalker(GenericASTTraversal, NonterminalActions, ComprehensionMixin):
     """
-    Class to traverses a Parse Tree of the bytecode instruction built from parsing to
+    Class to traverse a Parse Tree of the bytecode instruction built from parsing to
     produce some sort of source text.
     The Parse tree may be turned an Abstract Syntax tree as an intermediate step.
     """
@@ -267,27 +266,32 @@ def __init__(
             is_pypy=is_pypy,
         )
 
+        self.ERROR = None
         self.ast_errors = []
-        self.currentclass = None
         self.classes = []
+        self.compile_mode = compile_mode
+        self.currentclass = None
         self.debug_parser = dict(debug_parser)
-        self.line_number = 1
+        self.is_pypy = is_pypy
         self.linemap = {}
-        self.params = params
+        self.line_number = 1
+        self.linestarts = linestarts
+        self.mod_globs = set()
+        self.name = None
+        self.offset2inst_index = scanner.offset2inst_index
         self.param_stack = []
-        self.ERROR = None
-        self.prec = 100
+        self.params = params
+        self.pending_newlines = 0
+        self.prec = NO_PARENTHESIS_EVER
         self.return_none = False
-        self.mod_globs = set()
         self.showast = showast
-        self.pending_newlines = 0
-        self.linestarts = linestarts
+        self.version = version
+
         self.treeTransform = TreeTransform(version=self.version, show_ast=showast)
 
         # FIXME: have p.insts update in a better way
         # modularity is broken here
         self.insts = scanner.insts
-        self.offset2inst_index = scanner.offset2inst_index
 
         # Initialize p_lambda on demand
         self.p_lambda = None
@@ -312,10 +316,6 @@ def __init__(
         # An example is:
         # __module__ = __name__
         self.hide_internal = True
-        self.compile_mode = compile_mode
-        self.name = None
-        self.version = version
-        self.is_pypy = is_pypy
         customize_for_version(self, is_pypy, version)
         return