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* lisp/emacs-lisp/backquote.el (backquote-process): Optimize away the ,' case.

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This commit is contained in:
Stefan Monnier 2014-11-15 23:59:50 -05:00
parent e68a171ebd
commit 86009dd5d8
2 changed files with 15 additions and 10 deletions
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17
lisp/emacs-lisp/backquote.el
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@ -148,16 +148,19 @@ LEVEL is only used internally and indicates the nesting level:
(t
(list 'apply '(function vector) (cdr n))))))))
((atom s)
;; FIXME: Use macroexp-quote!
(cons 0 (if (or (null s) (eq s t) (not (symbolp s)))
s
(list 'quote s))))
((eq (car s) backquote-unquote-symbol)
(if (<= level 0)
(if (> (length s) 2)
;; We could support it with: (cons 2 `(list . ,(cdr s)))
;; But let's not encourage such uses.
(error "Multiple args to , are not supported: %S" s)
(cons 1 (nth 1 s)))
(cond
((> (length s) 2)
;; We could support it with: (cons 2 `(list . ,(cdr s)))
;; But let's not encourage such uses.
(error "Multiple args to , are not supported: %S" s))
(t (cons (if (eq (car-safe (nth 1 s)) 'quote) 0 1)
(nth 1 s))))
(backquote-delay-process s (1- level))))
((eq (car s) backquote-splice-symbol)
(if (<= level 0)
@ -215,9 +218,7 @@ LEVEL is only used internally and indicates the nesting level:
;; Tack on any initial elements.
(if firstlist
(setq expression (backquote-listify firstlist (cons 1 expression))))
(if (eq (car-safe expression) 'quote)
(cons 0 (list 'quote s))
(cons 1 expression))))))
(cons (if (eq (car-safe expression) 'quote) 0 1) expression)))))
;; backquote-listify takes (tag . structure) pairs from backquote-process
;; and decides between append, list, backquote-list*, and cons depending