Fix triple-quoting electricity in python-mode

* lisp/progmodes/python.el (python-electric-pair-string-delimiter): Fix
triple-quoting electricity. 

* test/automated/python-tests.el (python-triple-quote-pairing): New test.
(python-syntax-after-python-backspace): New test.

Fixes: debbugs:17192

1 files changed, 39 insertions, 0 deletions

diff --git a/test/automated/python-tests.el b/test/automated/python-tests.el
index dc58138ced4..8fe8f71264f 100644
--- a/test/automated/python-tests.el
+++ b/test/automated/python-tests.el
@@ -134,6 +134,16 @@ aliqua."
 
 ;;; Font-lock and syntax
 
+(ert-deftest python-syntax-after-python-backspace ()
+  ;; `python-indent-dedent-line-backspace' garbles syntax
+  :expected-result :failed
+  (python-tests-with-temp-buffer
+      "\"\"\""
+    (goto-char (point-max))
+    (python-indent-dedent-line-backspace 1)
+    (should (string= (buffer-string) "\"\""))
+    (should (null (nth 3 (syntax-ppss))))))
+
 
 ;;; Indentation
 
@@ -2696,6 +2706,9 @@ def foo(a, b, c):
         (equal (symbol-value (car ccons)) (cdr ccons)))))
     (kill-buffer buffer)))
 
+
+;;; Electricity
+
 (ert-deftest python-util-forward-comment-1 ()
   (python-tests-with-temp-buffer
    (concat
@@ -2708,6 +2721,32 @@ def foo(a, b, c):
    (python-util-forward-comment -1)
    (should (= (point) (point-min)))))
 
+(ert-deftest python-triple-quote-pairing ()
+  (python-tests-with-temp-buffer
+      "\"\"\n"
+    (goto-char (1- (point-max)))
+    (let ((last-command-event ?\"))
+      (call-interactively 'self-insert-command))
+    (should (string= (buffer-string)
+                     "\"\"\"\"\"\"\n"))
+    (should (= (point) 4)))
+  (python-tests-with-temp-buffer
+      "\n"
+    (let ((last-command-event ?\"))
+      (dotimes (i 3)
+        (call-interactively 'self-insert-command)))
+    (should (string= (buffer-string)
+                     "\"\"\"\"\"\"\n"))
+    (should (= (point) 4)))
+  (python-tests-with-temp-buffer
+      "\"\n\"\"\n"
+    (goto-char (1- (point-max)))
+    (let ((last-command-event ?\"))
+      (call-interactively 'self-insert-command))
+    (should (= (point) (1- (point-max))))
+    (should (string= (buffer-string)
+                     "\"\n\"\"\"\n"))))
+
 
 (provide 'python-tests)