Fix Python 3 language issues and add an explicit check for Python version == 2.

Summary:
Python bindings cannot support Python 3 without work being done to fix Unicode c-string conversion.

This was attempted in https://reviews.llvm.org/D26082. That patch was reverted due to memory access issues on Linux.

This revision fixes enough language compatibility issues for the clang module to be loaded and raise an error if the Python version is not 2.

Reviewers: mgorny, MathieuDuponchelle, rengolin, compnerd

Reviewed By: compnerd

Differential Revision: https://reviews.llvm.org/D28682

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@292247 91177308-0d34-0410-b5e6-96231b3b80d8

2 files changed, 17 insertions, 9 deletions

diff --git a/bindings/python/clang/__init__.py b/bindings/python/clang/__init__.py
index 88f3081238..fba49e38c9 100644
--- a/bindings/python/clang/__init__.py
+++ b/bindings/python/clang/__init__.py
@@ -20,5 +20,13 @@ The available modules are:
     Bindings for the Clang indexing library.
 """
 
+
+# Python 3 uses unicode for strings. The bindings, in particular the interaction
+# with ctypes, need modifying to handle conversions between unicode and
+# c-strings.
+import sys 
+if sys.version_info[0] != 2: 
+    raise Exception("Only Python 2 is supported.")
+
 __all__ = ['cindex']
 
diff --git a/bindings/python/clang/cindex.py b/bindings/python/clang/cindex.py
index c1c7590fe9..cf867bbf7d 100644
--- a/bindings/python/clang/cindex.py
+++ b/bindings/python/clang/cindex.py
@@ -554,8 +554,8 @@ class BaseEnumeration(object):
         if value >= len(self.__class__._kinds):
             self.__class__._kinds += [None] * (value - len(self.__class__._kinds) + 1)
         if self.__class__._kinds[value] is not None:
-            raise ValueError,'{0} value {1} already loaded'.format(
-                str(self.__class__), value)
+            raise ValueError('{0} value {1} already loaded'.format(
+                str(self.__class__), value))
         self.value = value
         self.__class__._kinds[value] = self
         self.__class__._name_map = None
@@ -577,7 +577,7 @@ class BaseEnumeration(object):
     @classmethod
     def from_id(cls, id):
         if id >= len(cls._kinds) or cls._kinds[id] is None:
-            raise ValueError,'Unknown template argument kind %d' % id
+            raise ValueError('Unknown template argument kind %d' % id)
         return cls._kinds[id]
 
     def __repr__(self):
@@ -1777,7 +1777,7 @@ class StorageClass(object):
         if value >= len(StorageClass._kinds):
             StorageClass._kinds += [None] * (value - len(StorageClass._kinds) + 1)
         if StorageClass._kinds[value] is not None:
-            raise ValueError,'StorageClass already loaded'
+            raise ValueError('StorageClass already loaded')
         self.value = value
         StorageClass._kinds[value] = self
         StorageClass._name_map = None
@@ -1798,7 +1798,7 @@ class StorageClass(object):
     @staticmethod
     def from_id(id):
         if id >= len(StorageClass._kinds) or not StorageClass._kinds[id]:
-            raise ValueError,'Unknown storage class %d' % id
+            raise ValueError('Unknown storage class %d' % id)
         return StorageClass._kinds[id]
 
     def __repr__(self):
@@ -2729,9 +2729,9 @@ class TranslationUnit(ClangObject):
                     # FIXME: It would be great to support an efficient version
                     # of this, one day.
                     value = value.read()
-                    print value
+                    print(value)
                 if not isinstance(value, str):
-                    raise TypeError,'Unexpected unsaved file contents.'
+                    raise TypeError('Unexpected unsaved file contents.')
                 unsaved_files_array[i].name = name
                 unsaved_files_array[i].contents = value
                 unsaved_files_array[i].length = len(value)
@@ -2793,9 +2793,9 @@ class TranslationUnit(ClangObject):
                     # FIXME: It would be great to support an efficient version
                     # of this, one day.
                     value = value.read()
-                    print value
+                    print(value)
                 if not isinstance(value, str):
-                    raise TypeError,'Unexpected unsaved file contents.'
+                    raise TypeError('Unexpected unsaved file contents.')
                 unsaved_files_array[i].name = name
                 unsaved_files_array[i].contents = value
                 unsaved_files_array[i].length = len(value)