rdef keyword for overridable methods

Cython/Compiler/Nodes.py

@@ -714,9 +714,7 @@ class CFuncDefNode(FuncDefNode):
             defining = self.body is not None)
         self.return_type = type.return_type
 
-        if 'overrideable' in self.modifiers or 'visible' in self.modifiers:
-            if 'visible' in self.modifiers:
-                self.modifiers.remove('visible')
+        if self.overridable:
             import ExprNodes
             arg_names = [arg.name for arg in self.type.args]
             self_arg = ExprNodes.NameNode(self.pos, name=arg_names[0])
@@ -735,10 +733,8 @@ class CFuncDefNode(FuncDefNode):
             env.entries[name] = self.entry
             if Options.intern_names:
                 self.py_func.interned_attr_cname = env.intern(self.py_func.entry.name)
-            if 'overrideable' in self.modifiers:
-                self.modifiers.remove('overrideable')
-                self.override = OverrideCheckNode(self.pos, py_func = self.py_func)
-                self.body.stats.insert(0, self.override)
+            self.override = OverrideCheckNode(self.pos, py_func = self.py_func)
+            self.body.stats.insert(0, self.override)
             
                     
     def declare_arguments(self, env):

Cython/Compiler/Parsing.py

@@ -1211,11 +1211,19 @@ def p_statement(s, level, cdef_flag = 0, visibility = 'private'):
         return p_ctypedef_statement(s, level, visibility)
     if s.sy == 'cdef':
         cdef_flag = 1
+        overridable = 0
+        s.next()
+    if s.sy == 'rdef':
+        cdef_flag = 1
+        overridable = 1
         s.next()
     if cdef_flag:
         if level not in ('module', 'module_pxd', 'function', 'c_class', 'c_class_pxd'):
             s.error('cdef statement not allowed here')
-        return p_cdef_statement(s, level, visibility)
+        return p_cdef_statement(s, level, visibility, overridable = overridable)
+#    elif s.sy == 'rdef':
+#        s.next()
+#        return p_c_func_or_var_declaration(s, level, s.position(), visibility = visibility, overridable = True)
     elif s.sy == 'def':
         if level not in ('module', 'class', 'c_class', 'property'):
             s.error('def statement not allowed here')
@@ -1570,8 +1578,10 @@ def p_c_arg_decl(s, in_pyfunc, cmethod_flag = 0, kw_only = 0):
         default = default,
         kw_only = kw_only)
 
-def p_cdef_statement(s, level, visibility = 'private'):
+def p_cdef_statement(s, level, visibility = 'private', overridable = False):
     pos = s.position()
+    if overridable and level not in ('c_class', 'c_class_pxd'):
+            error(pos, "Overridable cdef function not allowed here")
     visibility = p_visibility(s, visibility)
     if visibility == 'extern' and s.sy in ('from' ,':'):
             return p_cdef_extern_block(s, level, pos)
@@ -1593,7 +1603,7 @@ def p_cdef_statement(s, level, visibility = 'private'):
         s.expect_newline('Expected a newline')
         return node
     else:
-        return p_c_func_or_var_declaration(s, level, pos, visibility)
+        return p_c_func_or_var_declaration(s, level, pos, visibility, overridable)
 
 def p_cdef_extern_block(s, level, pos):
     include_file = None
@@ -1698,13 +1708,13 @@ def p_visibility(s, prev_visibility):
     return visibility
     
 def p_c_modifiers(s):
-    if s.sy == 'IDENT' and s.systring in ('inline', 'visible', 'overrideable'):
+    if s.sy == 'IDENT' and s.systring in ('inline',):
         modifier = s.systring
         s.next()
         return [modifier] + p_c_modifiers(s)
     return []
 
-def p_c_func_or_var_declaration(s, level, pos, visibility = 'private'):
+def p_c_func_or_var_declaration(s, level, pos, visibility = 'private', overridable = False):
     cmethod_flag = level in ('c_class', 'c_class_pxd')
     modifiers = p_c_modifiers(s)
     base_type = p_c_base_type(s)
@@ -1718,7 +1728,8 @@ def p_c_func_or_var_declaration(s, level, pos, visibility = 'private'):
             base_type = base_type,
             declarator = declarator, 
             body = suite,
-            modifiers = modifiers)
+            modifiers = modifiers,
+            overridable = overridable)
     else:
         if level == 'module_pxd' and visibility <> 'extern':
             error(pos, 

Cython/Compiler/Scanning.py

@@ -138,7 +138,7 @@ reserved_words = [
     "raise", "import", "exec", "try", "except", "finally",
     "while", "if", "elif", "else", "for", "in", "assert",
     "and", "or", "not", "is", "in", "lambda", "from",
-    "NULL", "cimport", "by", "with"
+    "NULL", "cimport", "by", "with", "rdef"
 ]
 
 function_contexts = [ # allowed arguments to the "with" option