1 files changed, 36 insertions, 17 deletions

diff --git a/Python/future.c b/Python/future.c
index d24ae416ff..81eab54dd6 100644
--- a/Python/future.c
+++ b/Python/future.c
@@ -11,7 +11,7 @@
 "from __future__ imports must occur at the beginning of the file"
 
 static int
-future_check_features(PyFutureFeatures *ff, stmt_ty s, const char *filename)
+future_check_features(PyFutureFeatures *ff, stmt_ty s, PyObject *filename)
 {
     int i;
     asdl_seq *names;
@@ -43,12 +43,12 @@ future_check_features(PyFutureFeatures *ff, stmt_ty s, const char *filename)
         } else if (strcmp(feature, "braces") == 0) {
             PyErr_SetString(PyExc_SyntaxError,
                             "not a chance");
-            PyErr_SyntaxLocationEx(filename, s->lineno, s->col_offset);
+            PyErr_SyntaxLocationObject(filename, s->lineno, s->col_offset);
             return 0;
         } else {
             PyErr_Format(PyExc_SyntaxError,
                          UNDEFINED_FUTURE_FEATURE, feature);
-            PyErr_SyntaxLocationEx(filename, s->lineno, s->col_offset);
+            PyErr_SyntaxLocationObject(filename, s->lineno, s->col_offset);
             return 0;
         }
     }
@@ -56,13 +56,17 @@ future_check_features(PyFutureFeatures *ff, stmt_ty s, const char *filename)
 }
 
 static int
-future_parse(PyFutureFeatures *ff, mod_ty mod, const char *filename)
+future_parse(PyFutureFeatures *ff, mod_ty mod, PyObject *filename)
 {
-    int i, found_docstring = 0, done = 0, prev_line = 0;
+    int i, done = 0, prev_line = 0;
+    stmt_ty first;
 
     if (!(mod->kind == Module_kind || mod->kind == Interactive_kind))
         return 1;
 
+    if (asdl_seq_LEN(mod->v.Module.body) == 0)
+        return 1;
+
     /* A subsequent pass will detect future imports that don't
        appear at the beginning of the file.  There's one case,
        however, that is easier to handle here: A series of imports
@@ -71,8 +75,13 @@ future_parse(PyFutureFeatures *ff, mod_ty mod, const char *filename)
        but is preceded by a regular import.
     */
 
+    i = 0;
+    first = (stmt_ty)asdl_seq_GET(mod->v.Module.body, i);
+    if (first->kind == Expr_kind && first->v.Expr.value->kind == Str_kind)
+        i++;
 
-    for (i = 0; i < asdl_seq_LEN(mod->v.Module.body); i++) {
+
+    for (; i < asdl_seq_LEN(mod->v.Module.body); i++) {
         stmt_ty s = (stmt_ty)asdl_seq_GET(mod->v.Module.body, i);
 
         if (done && s->lineno > prev_line)
@@ -92,32 +101,27 @@ future_parse(PyFutureFeatures *ff, mod_ty mod, const char *filename)
                 if (done) {
                     PyErr_SetString(PyExc_SyntaxError,
                                     ERR_LATE_FUTURE);
-                    PyErr_SyntaxLocationEx(filename, s->lineno, s->col_offset);
+                    PyErr_SyntaxLocationObject(filename, s->lineno, s->col_offset);
                     return 0;
                 }
                 if (!future_check_features(ff, s, filename))
                     return 0;
                 ff->ff_lineno = s->lineno;
             }
-            else
-                done = 1;
-        }
-        else if (s->kind == Expr_kind && !found_docstring) {
-            expr_ty e = s->v.Expr.value;
-            if (e->kind != Str_kind)
+            else {
                 done = 1;
-            else
-                found_docstring = 1;
+            }
         }
-        else
+        else {
             done = 1;
+        }
     }
     return 1;
 }
 
 
 PyFutureFeatures *
-PyFuture_FromAST(mod_ty mod, const char *filename)
+PyFuture_FromASTObject(mod_ty mod, PyObject *filename)
 {
     PyFutureFeatures *ff;
 
@@ -135,3 +139,18 @@ PyFuture_FromAST(mod_ty mod, const char *filename)
     }
     return ff;
 }
+
+
+PyFutureFeatures *
+PyFuture_FromAST(mod_ty mod, const char *filename_str)
+{
+    PyFutureFeatures *ff;
+    PyObject *filename;
+
+    filename = PyUnicode_DecodeFSDefault(filename_str);
+    if (filename == NULL)
+        return NULL;
+    ff = PyFuture_FromASTObject(mod, filename);
+    Py_DECREF(filename);
+    return ff;
+}