From d0ebd6cb53610f0d06014a07cfa405dbe1547430 Mon Sep 17 00:00:00 2001 From: Austin Clements Date: Fri, 14 Dec 2012 10:07:35 -0500 Subject: [PATCH] emacs: Fix bug in resynchronizing after a JSON parse error Previously, if the input stream consisted only of an error message, notmuch-json-begin-compound would signal a (wrong-type-argument number-or-marker-p nil) error when reaching the end of the error message. This happened because notmuch-json-scan-to-value would think that it reached a value and put the parser into the 'value state. Even after notmuch-json-begin-compound signaled the syntax error, the parser would remain in this state and when the resynchronization logic reached the end of the buffer, the parser would fail because the 'value state indicates that characters are available. This fixes this problem by restoring the parser's previous state if it encounters a syntax error. --- emacs/notmuch-lib.el | 22 +++++++++++++--------- 1 file changed, 13 insertions(+), 9 deletions(-) diff --git a/emacs/notmuch-lib.el b/emacs/notmuch-lib.el index 9c4ee718..fb6d3e7f 100644 --- a/emacs/notmuch-lib.el +++ b/emacs/notmuch-lib.el @@ -465,15 +465,19 @@ Entering JSON objects is currently unimplemented." (with-current-buffer (notmuch-json-buffer jp) ;; Disallow terminators (setf (notmuch-json-allow-term jp) nil) - (or (notmuch-json-scan-to-value jp) - (if (/= (char-after) ?\[) - (signal 'json-readtable-error (list "expected '['")) - (forward-char) - (push ?\] (notmuch-json-term-stack jp)) - ;; Expect a value or terminator next - (setf (notmuch-json-next jp) 'expect-value - (notmuch-json-allow-term jp) t) - t)))) + ;; Save "next" so we can restore it if there's a syntax error + (let ((saved-next (notmuch-json-next jp))) + (or (notmuch-json-scan-to-value jp) + (if (/= (char-after) ?\[) + (progn + (setf (notmuch-json-next jp) saved-next) + (signal 'json-readtable-error (list "expected '['"))) + (forward-char) + (push ?\] (notmuch-json-term-stack jp)) + ;; Expect a value or terminator next + (setf (notmuch-json-next jp) 'expect-value + (notmuch-json-allow-term jp) t) + t))))) (defun notmuch-json-read (jp) "Parse the value at point in JP's buffer.