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Is justification random?
- To: common-lisp@SU-AI.ARPA
- Subject: Is justification random?
- From: NGALL@G.BBN.COM
- Date: Fri, 16 May 1986 03:01:00 -0000
- Sender: NGALL@G.BBN.COM
I wanted to use format to lay out some column headers like this:
| xxx | xxx | xxx | ...
| yyy | yyy | yyy | ...
I assumed that the ~<...~> format directives would fit the bill. When
I tried it on VaxLisp, I discovered that their FORMAT randomizes the
dispersion of whitespace (their code actually calls a random number
generator). Their rationale is that doing so will prevent whitespace
from clumping on the left if ~<...~> were used to put out a paragraph
The Symbolics CL does not randomize, it inserts spaces from left to
right. I guess their rationale (really mine) is that it makes column
header layout work right (a much more common use of ~<...~>).
CLtL is ambiguous. It merely says "the spacing is evenly divided
between the text segments" (pg. 404)
Here is a brief test case:
(dotimes (i 10) (format t "~&~3:<x~;|~>"))
On the Vax, the x is not in the same column each time. On the SCL it
I think the behavior of ~<...~> should be standardized and I vote