Lisp 如何设置字符串列表的格式
我有一个字符串列表,需要使用emacs lisp进行格式化。这是我唯一能想到的办法:Lisp 如何设置字符串列表的格式,lisp,elisp,Lisp,Elisp,我有一个字符串列表,需要使用emacs lisp进行格式化。这是我唯一能想到的办法: (setq slist '("is there" "any" "way" "directed iteration")) (format "%s _%s_ %s to do %S in elisp?" (elt slist 0) (elt slist 1) (elt slist 2) (elt slist 3) (elt s
(setq slist '("is there" "any" "way" "directed iteration"))
(format "%s _%s_ %s to do %S in elisp?"
(elt slist 0)
(elt slist 1)
(elt slist 2)
(elt slist 3)
(elt slist 4))
给我想要的
is there _any_ way to do "directed iteration" in elisp?
一定有更优雅的方式,但经过深思熟虑,我看不到。我对emacs lisp非常陌生,可能缺少一些明显的东西。使用
apply
:
(apply 'format "%s _%s_ %s to do %S in elisp?" slist)
apply
函数将一个函数(或符号)作为其第一个参数,然后是一些单独的参数,最后是一个参数列表。我决定通过添加更多功能、修复一些bug和添加更多bug,将其变成一个独立的项目!yey:)
您可以在此处找到该项目:
不确定这辆车有多大,但乍一看它似乎起了作用:
(defun directive-end (c)
(member c "csdoxXeg%"))
(defun pp-if-nil (spec)
(position ?\% spec))
(defun pp-list (spec args)
(let ((pos 0) (last 0) (fstring "% ") current seen-^)
(catch 't
(while t
(setq pos (1+ (or (position ?% spec :start pos) -1))
current (aref spec pos))
(unless (and seen-^ (char-equal current ?\}) (null args))
(princ (substring spec last (1- pos))))
(setq last pos pos (1+ pos))
(cond
((char-equal current ?^)
(incf last)
(setq seen-^ t))
((char-equal current ?\{)
(setq pos (+ pos (pp-list (substring spec pos) (car args)))
args (cdr args)
last pos
seen-^ nil ))
((char-equal current ?\})
(if args (setq pos 0 last 0)
(throw 't nil)))
((char-equal current ?%)
(setq seen-^ nil last (1+ last))
(write-char ?%))
(t (unless args (error "Not enough argumens for list iteration"))
(setf (aref fstring 1) current)
(princ (format fstring (car args)))
(setq args (cdr args)
seen-^ nil
last
(or (position-if #'directive-end spec :start pos)
pos)))))) pos))
(defun cl-format (spec &rest args)
(with-output-to-string
(let ((pos 0) (last 0) (fstring "% ") current)
(catch 't
(while t
(setq pos (1+ (or (position ?\% spec :start pos) -1))
current (aref spec pos))
(when (= pos 0) (throw 't nil))
(princ (substring spec last (1- pos)))
(setq last pos pos (1+ pos))
(cond
((char-equal current ?^)
(unless args
(setq last (pp-if-nil spec)
pos last)))
((char-equal current ?\{)
(setq pos (+ pos (pp-list (substring spec pos) (car args)))
args (cdr args)
last pos))
((char-equal current ?\})
(error "Unmatched list iteration termination directive"))
((char-equal current ?%)
(write-char ?%)
(incf last))
(t (unless args (error "Not enough argumens"))
(setf (aref fstring 1) current)
(princ (format fstring (car args)))
(setq args (cdr args)
last
(or (position-if #'directive-end spec :start pos)
pos))))
(incf pos))))))
(cl-format "begin: %{%s = %d%^,%}; %% %c %% %{%{%s -> %d%^.%},%}"
'(a 1 b 2 c 3) ?\X '((a 2 b 4 c 6) (a 1 b 3 c 5)))
"begin: a = 1,b = 2,c = 3; % X % a -> 2.b -> 4.c -> 6,a -> 1.b -> 3.c -> 5,"
这试图复制
~{…~}
指令的一些(非常简单的)常见的类似Lisp的打印行为。是的,就是这样,谢谢。这是显而易见的,我确实错过了申请的本质。哇,这是一个多么伟大的功能啊!