backed out docstring handling change - breaks too many things

Cython/Compiler/ParseTreeTransforms.py

@@ -179,35 +179,10 @@ class PostParse(ScopeTrackingTransform):
             '__cythonbufferdefaults__' : self.handle_bufferdefaults
         }
 
-    def _visit_DocString(self, result):
-        if hasattr(result.body, 'stats') and result.body.stats:
-            firstNode = result.body.stats[0]
-            if isinstance(firstNode, Nodes.ExprStatNode) and firstNode.expr.is_string_literal:
-                result.body.stats = result.body.stats[1:]
-                self.doc = firstNode.expr.value
-                result.doc = self.doc
-                return firstNode.expr, result
-        return None, result
-
-    def visit_FuncDefNode(self, node):
-        docNode, result = self._visit_DocString(super(PostParse, self).visit_FuncDefNode(node))
-        return result
-
-    def visit_PyClassDefNode(self, node):
-        docNode, result = self._visit_DocString(super(PostParse, self).visit_PyClassDefNode(node))
-        if docNode:
-            result.classobj.doc = docNode
-        return result
-
-    def visit_CClassDefNode(self, node):
-        docNode, result = self._visit_DocString(super(PostParse, self).visit_CClassDefNode(node))
-        return result
-
     def visit_ModuleNode(self, node):
         self.lambda_counter = 1
         self.genexpr_counter = 1
-        docNode, result = self._visit_DocString(super(PostParse, self).visit_ModuleNode(node))
-        return result
+        return super(PostParse, self).visit_ModuleNode(node)
 
     def visit_LambdaNode(self, node):
         # unpack a lambda expression into the corresponding DefNode
@@ -1671,7 +1646,7 @@ if VALUE is not None:
             return None
         else:
             return self.visit_ClassDefNode(node)
-
+    
     def visit_CStructOrUnionDefNode(self, node):
         # Create a wrapper node if needed.
         # We want to use the struct type information (so it can't happen

Cython/Compiler/Parsing.pxd

@@ -175,5 +175,6 @@ cdef p_class_statement(PyrexScanner s, decorators)
 cdef p_c_class_definition(PyrexScanner s, pos,  ctx)
 cdef p_c_class_options(PyrexScanner s)
 cdef p_property_decl(PyrexScanner s)
+cdef p_doc_string(PyrexScanner s)
 cdef p_compiler_directive_comments(PyrexScanner s)
 cdef p_cpp_class_definition(PyrexScanner s, pos, ctx)

Cython/Compiler/Parsing.py

@@ -1099,7 +1099,10 @@ def p_expression_or_assignment(s):
                 rhs = p_testlist(s)
             return Nodes.InPlaceAssignmentNode(lhs.pos, operator = operator, lhs = lhs, rhs = rhs)
         expr = expr_list[0]
-        return Nodes.ExprStatNode(expr.pos, expr = expr)
+        if isinstance(expr, (ExprNodes.UnicodeNode, ExprNodes.StringNode, ExprNodes.BytesNode)):
+            return Nodes.PassStatNode(expr.pos)
+        else:
+            return Nodes.ExprStatNode(expr.pos, expr = expr)
 
     rhs = expr_list[-1]
     if len(expr_list) == 2:
@@ -1867,6 +1870,8 @@ def p_suite(s, ctx = Ctx(), with_doc = 0, with_pseudo_doc = 0):
     if s.sy == 'NEWLINE':
         s.next()
         s.expect_indent()
+        if with_doc or with_pseudo_doc:
+            doc = p_doc_string(s)
         body = p_statement_list(s, ctx)
         s.expect_dedent()
     else:
@@ -2965,6 +2970,19 @@ def p_property_decl(s):
     doc, body = p_suite(s, Ctx(level = 'property'), with_doc = 1)
     return Nodes.PropertyNode(pos, name = name, doc = doc, body = body)
 
+def p_doc_string(s):
+    if s.sy == 'BEGIN_STRING':
+        pos = s.position()
+        kind, bytes_result, unicode_result = p_cat_string_literal(s)
+        if s.sy != 'EOF':
+            s.expect_newline("Syntax error in doc string")
+        if kind in ('u', ''):
+            return unicode_result
+        warning(pos, "Python 3 requires docstrings to be unicode strings")
+        return bytes_result
+    else:
+        return None
+
 def p_code(s, level=None, ctx=Ctx):
     body = p_statement_list(s, ctx(level = level), first_statement = 1)
     if s.sy != 'EOF':
@@ -2997,7 +3015,7 @@ def p_module(s, pxd, full_module_name, ctx=Ctx):
     if 'language_level' in directive_comments:
         s.context.set_language_level(directive_comments['language_level'])
 
-    doc = None
+    doc = p_doc_string(s)
     if pxd:
         level = 'module_pxd'
     else: