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Signal an error on recursive yas--fallback calls

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* yasnippet.el (yas--fallback): let-bind yas-fallback-behavior to
  'yas--fallback before actually doing the fallback. Signal an error if
  it's 'yas--fallback (indicating we're in an infinte loop).
This commit is contained in:
Noam Postavsky 2014-10-04 20:52:58 -04:00
parent 08b044e559
commit e7314516e3
1 changed files with 13 additions and 7 deletions
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yasnippet.el
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@ -2248,8 +2248,13 @@ Common gateway for `yas-expand-from-trigger-key' and
(cond ((eq yas-fallback-behavior 'return-nil) (cond ((eq yas-fallback-behavior 'return-nil)
;; return nil ;; return nil
nil) nil)
((eq yas-fallback-behavior 'yas--fallback)
(error (concat "yasnippet fallback loop!\n"
"This can happen when you bind `yas-expand' "
"outside of the `yas-minor-mode-map'.")))
((eq yas-fallback-behavior 'call-other-command) ((eq yas-fallback-behavior 'call-other-command)
(let* ((beyond-yasnippet (yas--keybinding-beyond-yasnippet))) (let* ((yas-fallback-behavior 'yas--fallback)
(beyond-yasnippet (yas--keybinding-beyond-yasnippet)))
(yas--message 4 "Falling back to %s" beyond-yasnippet) (yas--message 4 "Falling back to %s" beyond-yasnippet)
(assert (or (null beyond-yasnippet) (commandp beyond-yasnippet))) (assert (or (null beyond-yasnippet) (commandp beyond-yasnippet)))
(setq this-original-command beyond-yasnippet) (setq this-original-command beyond-yasnippet)
@ -2258,12 +2263,13 @@ Common gateway for `yas-expand-from-trigger-key' and
((and (listp yas-fallback-behavior) ((and (listp yas-fallback-behavior)
(cdr yas-fallback-behavior) (cdr yas-fallback-behavior)
(eq 'apply (car yas-fallback-behavior))) (eq 'apply (car yas-fallback-behavior)))
(if (cddr yas-fallback-behavior) (let ((yas-fallback-behavior 'yas--fallback))
(apply (cadr yas-fallback-behavior) (if (cddr yas-fallback-behavior)
(cddr yas-fallback-behavior)) (apply (cadr yas-fallback-behavior)
(when (commandp (cadr yas-fallback-behavior)) (cddr yas-fallback-behavior))
(setq this-command (cadr yas-fallback-behavior)) (when (commandp (cadr yas-fallback-behavior))
(call-interactively (cadr yas-fallback-behavior))))) (setq this-command (cadr yas-fallback-behavior))
(call-interactively (cadr yas-fallback-behavior))))))
(t (t
;; also return nil if all the other fallbacks have failed ;; also return nil if all the other fallbacks have failed
nil))) nil)))