Common-Lisp以功能格式打印制表符 [英] Common-Lisp printing the tab character in function format

问题描述

我希望使用format功能打印制表符.我可以用~C来实现，然后将#\tab用作format的参数，但这似乎有点冗长，因为换行符只需将~%放在字符串中即可.

I wish to print the tab character with the format function. I can achieve this with ~C and then placing #\tab as an argument to format, but this seems a bit verbose as for a newline one can simply place a ~% in the string.

• 使用format功能打印标签的最常用方法是什么?

• What is the most commonly used practise for printing tabs with the format function?

感谢所有帮助！

推荐答案

FORMAT中没有制表符的表示法.

There is no notation for the tab character in FORMAT.

有几种选择，但没有一个真的很不错.

There are several choices, but none is really really good.

正如您提到的，

• 使用#\tab(或设置为字符的变量)作为参数对我来说是可以的

• use #\tab (or a variable set to the character) as the argument, as you mention, is okay for me

在字符串中嵌入了文字制表符.这可能会因某些编辑器设置而中断，其中编辑器将制表符替换为空格.它也不是直接可见的.

embed a literal tab character in the string. This may break with some editor settings, where the editor replaces tabs with spaces. It's also not directly visible.

使用格式字符串中的函数，该函数将写入制表符

use a function in a format string, which writes a tab character

使用阅读器宏引入扩展的字符串语法.可能还不错.也许甚至存在一个.在comp.lang.lisp上有一个示例.

use a reader macro to introduce extended string syntax. Probably not bad. Maybe there exists even one. There was a post on comp.lang.lisp with an example.

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