Left arg to 0!:n is a good idea. I think we should have better support
for preprocessing scripts. Put it on the wishlist.
Henry Rich
On 8/24/2018 2:57 PM, 'Pascal Jasmin' via Programming wrote:
Rewriting scripts and then invoking them with 0!:0 noun (instead of file) has the
disadvantage of "breaking" 4!:4. If 4!:4 is ever used on a definition from the
file, it will report _1 (definition not from a script). This applies to definitions
inside the original file, often used to find the directory of the program, and used to
load related files and data.
The perfect solution is to add an optional left argument to 0!:n noun which
would be the filename returned by 4!;4 for definitions inside that noun.
A solution I can do myself, applies if the only real use for 4!:4 is in fact to find
"MYFILE" in a script.
The solution is to replace in the file all top level instances of lines
starting with (space intollerant)
MYDIR =:MYFILE =: (NB. not sure if this is needed, as the file is usually
obtained just to get MYDIR)
with a hardcoded string derived from what the x argument (MYFILE) to 0!:n
should be.
If this function over-rode the load command, then 4!;4 would return empty for
most definitions, which is only a problem if 4!:4 is ever used for anything
other than on a variable within its own script .
----------------------------------------------------------------------
For information about J forums see http://www.jsoftware.com/forums.htm
---
This email has been checked for viruses by AVG.
https://www.avg.com
----------------------------------------------------------------------
For information about J forums see http://www.jsoftware.com/forums.htm
