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+--- Thread: variable scope and library files. (/showthread.php?tid=42)
variable scope and library files. - bbjimmy - 10-20-2015
The scope of variables in library files change when the program is compiled. Run as a script, the variable scope is limited to the library file. once compiled, the scope increases to include the whole project unless they are declared local.
exmple:
test.yab...
#!yab
import library
for x=1 to 12
y=multiplybyfive(x)
print y
next
library file. ( library.yab)
export sub multiplybyfive (number)
y=0
for x=0 to 4
y = y + number
next
return y
end sub
Run test.yab as a script and all is well. Run it as a compiled binary and it hangs.
change the library like this:
export sub multiplybyfive (number)
local x,y
y=0
for x=0 to 4
y = y + number
next
return y
end sub
now it runs properly both as a script or compiled.
RE: variable scope and library files. - clasqm - 10-21-2015
Thanks for the warning. Explicitly making variables local is the right thing to do in any case. You never know when someone (even yourself) grabs your library code as a snippet and just cuts and pastes it into his own program . But the discrepancy between running a script and running as a binary is a little disconcerting.
Finding out what causes this and fixing it is the long-term solution (don't look at me, way above my pay grade), but in the meantime perhaps you can include this in the documentation for the next release.
RE: variable scope and library files. - bbjimmy - 10-21-2015
Interestingly, the scope is the same as when run as a script if one binds the program rather than using the BuildFactory.
RE: variable scope and library files. - bbjimmy - 10-23-2015
Apparently this was a design choice:
BuildFactory.yab:
// writing all the libs into the mainfile
// because the BuildFactory can not handle libs
I think I am going to experoment with changing this and making the BuildFactory use the same method that bind uses. Wish me luck!
RE: variable scope and library files. - clasqm - 10-24-2015
Good luck.
