Move some parse2 reduction rules into reducecheck

uncompyle6/parsers/parse2.py

@@ -1,4 +1,4 @@
-#  Copyright (c) 2015-2019 Rocky Bernstein
+#  Copyright (c) 2015-2020 Rocky Bernstein
 #  Copyright (c) 2000-2002 by hartmut Goebel <h.goebel@crazy-compilers.com>
 #
 #  Copyright (c) 1999 John Aycock
@@ -27,6 +27,7 @@ that a later phase can turn into a sequence of ASCII text.
 
 from __future__ import print_function
 
+from uncompyle6.parsers.reducecheck import (except_handler, tryelsestmt)
 from uncompyle6.parser import PythonParser, PythonParserSingle, nop_func
 from uncompyle6.parsers.treenode import SyntaxTree
 from spark_parser import DEFAULT_DEBUG as PARSER_DEFAULT_DEBUG
@@ -668,6 +669,7 @@ class Python2Parser(PythonParser):
         if tokens is None:
             return False
         lhs = rule[0]
+        n = len(tokens)
 
         if rule == ("and", ("expr", "jmp_false", "expr", "\\e_come_from_opt")):
             # If the instruction after the instructions forming the "and"  is an "YIELD_VALUE"
@@ -707,30 +709,7 @@ class Python2Parser(PythonParser):
             jump_target = jmp_false[0].attr
             return jump_target > tokens[last].off2int()
         elif lhs in ("except_handler, except_handler_else"):
-
-            # FIXME: expand this to other 2.x version
-            if self.version != 2.7: return False
-
-            if tokens[first] in ("JUMP_FORWARD", "JUMP_ABSOLUTE"):
-                first_jump_target = tokens[first].pattr
-                last = min(last, len(tokens)-1)
-                for i in range(last, first, -1):
-                    if tokens[i] == "END_FINALLY":
-                        i -= 1
-                        second_jump = tokens[i]
-                        if second_jump in ("JUMP_FORWARD", "JUMP_ABSOLUTE"):
-                            second_jump_target = second_jump.pattr
-                            equal_target = second_jump_target == first_jump_target
-                            if equal_target:
-                                return lhs != "except_handler"
-                            else:
-                                return lhs != "except_handler_else"
-                            pass
-                        else:
-                            return False
-                    pass
-                pass
-            pass
+            return except_handler(self, lhs, n, rule, ast, tokens, first, last)
         elif lhs in ("raise_stmt1",):
             # We will assume 'LOAD_ASSERT' will be handled by an assert grammar rule
             return tokens[first] == "LOAD_ASSERT" and (last >= len(tokens))
@@ -741,35 +720,7 @@ class Python2Parser(PythonParser):
             op = ast[0][0]
             return op.kind in ("and", "or")
         elif lhs in ("tryelsestmt", "tryelsestmtl"):
-            # Check the end of the except handler that there isn't a jump from
-            # inside the except handler to the end. If that happens
-            # then this is a "try" with no "else".
-            except_handler = ast[3]
-            if except_handler == "except_handler":
-
-                come_from = except_handler[-1]
-                # We only care about the *first* come_from because that is the
-                # the innermost one. So if the "tryelse" is invalid (should be a "try")
-                # ti will be invalid here.
-                if come_from == "COME_FROM":
-                    first_come_from = except_handler[-1]
-                elif come_from == "END_FINALLY":
-                    return False
-                else:
-                    assert come_from == "come_froms"
-                    first_come_from = come_from[0]
-
-                leading_jump = except_handler[0]
-
-                # We really don't care that this is a jump per-se. But
-                # we could also check that this jumps to the end of the except if
-                # desired.
-                if isinstance(leading_jump, SyntaxTree):
-                    except_handler_first_offset = leading_jump.first_child().off2int()
-                else:
-                    except_handler_first_offset = leading_jump.off2int()
-                return first_come_from.attr > except_handler_first_offset
-
+            return tryelsestmt(self, lhs, n, rule, ast, tokens, first, last)
 
         return False
 

uncompyle6/parsers/reducecheck/__init__.py

@@ -1,8 +1,10 @@
 from uncompyle6.parsers.reducecheck.and_check import *
+from uncompyle6.parsers.reducecheck.except_handler import *
 from uncompyle6.parsers.reducecheck.ifelsestmt import *
 from uncompyle6.parsers.reducecheck.iflaststmt import *
 from uncompyle6.parsers.reducecheck.ifstmt import *
 from uncompyle6.parsers.reducecheck.ifstmts_jump import *
 from uncompyle6.parsers.reducecheck.or_check import *
+from uncompyle6.parsers.reducecheck.tryelsestmt import *
 from uncompyle6.parsers.reducecheck.while1elsestmt import *
 from uncompyle6.parsers.reducecheck.while1stmt import *

uncompyle6/parsers/reducecheck/except_handler.py

@@ -0,0 +1,27 @@
+#  Copyright (c) 2020 Rocky Bernstein
+
+def except_handler(self, lhs, n, rule, ast, tokens, first, last):
+    # FIXME: expand this to other versions
+    if self.version not in (2.7, 3.5):
+        return False
+
+    if tokens[first] in ("JUMP_FORWARD", "JUMP_ABSOLUTE"):
+        first_jump_target = tokens[first].pattr
+        last = min(last, len(tokens)-1)
+        for i in range(last, first, -1):
+            if tokens[i] == "END_FINALLY":
+                i -= 1
+                second_jump = tokens[i]
+                if second_jump in ("JUMP_FORWARD", "JUMP_ABSOLUTE"):
+                    second_jump_target = second_jump.pattr
+                    equal_target = second_jump_target == first_jump_target
+                    if equal_target:
+                        return lhs != "except_handler"
+                    else:
+                        return lhs != "except_handler_else"
+                    pass
+                else:
+                    return False
+            pass
+        pass
+    return False

uncompyle6/parsers/reducecheck/tryelsestmt.py

@@ -0,0 +1,34 @@
+#  Copyright (c) 2020 Rocky Bernstein
+
+from uncompyle6.parsers.treenode import SyntaxTree
+
+def tryelsestmt(self, lhs, n, rule, ast, tokens, first, last):
+    # Check the end of the except handler that there isn't a jump from
+    # inside the except handler to the end. If that happens
+    # then this is a "try" with no "else".
+    except_handler = ast[3]
+    if except_handler == "except_handler":
+
+        come_from = except_handler[-1]
+        # We only care about the *first* come_from because that is the
+        # the innermost one. So if the "tryelse" is invalid (should be a "try")
+        # ti will be invalid here.
+        if come_from == "COME_FROM":
+            first_come_from = except_handler[-1]
+        elif come_from == "END_FINALLY":
+            return False
+        else:
+            assert come_from == "come_froms"
+            first_come_from = come_from[0]
+
+        leading_jump = except_handler[0]
+
+        # We really don't care that this is a jump per-se. But
+        # we could also check that this jumps to the end of the except if
+        # desired.
+        if isinstance(leading_jump, SyntaxTree):
+            except_handler_first_offset = leading_jump.first_child().off2int()
+        else:
+            except_handler_first_offset = leading_jump.off2int()
+        return first_come_from.attr > except_handler_first_offset
+    return False