Perlito5::Javascript2::IO

[kurpitsa]

My test program is:

print "hello";

I compile:

perl perlito5.pl -Cjs ./test.pl > ./test.js

When i run test.js in chrome, I get the message

"Uncaught ReferenceError: write is not defined"

It works fine in NodeJS though. I am inexperienced with the perlito compiler, but I found out that at line 489 on Perlito5::Javascript2::IO

       write(p5str(List__[i]));

looks doubtful. Everything works if I replace this with console.log or document.write. If nodejs is used
this line is never executed (nodejs ./test.js).

[fglock]

The nodejs backend does have a built-in "print", which uses the "process.stdout", "process.stderr", and "fs" javascript modules:

https://github.com/fglock/Perlito/blob/master/src5/lib/Perlito5/Javascript2/IO.pm#L32

However, the browser variant does not come with a native "print" function, because the actual "printing" action depends on your web page layout. So the keywords "print", "say", and "printf" will call a javascript "write" function, which you have to provide.

This is implemented in line 489, as you said:

https://github.com/fglock/Perlito/blob/master/src5/lib/Perlito5/Javascript2/IO.pm#L486

Here is an example for a browser implementation that supports STDOUT and STDERR:

https://github.com/fglock/Perlito/blob/master/html/perlito5.html#L119

Do you think calling "document.write()" would be a better default action?

• Flavio

Note: the switch between "nodejs" and "browser" modes is at: https://github.com/fglock/Perlito/blob/master/src5/lib/Perlito5/Javascript2/IO.pm#L28

Another note: if you use html/perlito5.html as a starting point, you can compile Perl to Javascript in the browser (it uses "perlito5.js" instead of "perlito5.pl"). The js file is created by the "make" command.

2015-11-02 21:22 GMT+01:00 kurpitsa notifications@github.com:

My test program is:

print "hello";

I compile:

perl perlito5.pl -Cjs ./test.pl > ./test.js

When i run test.js in chrome, I get the message

"Uncaught ReferenceError: write is not defined"

It works fine in NodeJS though. I am inexperienced with the perlito compiler, but I found out that at line 489 on Perlito5::Javascript2::IO

   write(p5str(List__[i]));

looks doubtful. Everything works if I replace this with console.log or document.write. If nodejs is used

this line is never executed (nodejs ./test.js).

— Reply to this email directly or view it on GitHub https://github.com/fglock/Perlito/issues/32.

[yati-sagade]

I think console.log() is fairly common. Maybe something like this would help: http://stackoverflow.com/a/14469096/687467

[kurpitsa]

I think the solution above reflects what the user might expect. Perhaps it could go for console log as described in the link unless the write function is already defined.

[fglock]

print() will try harder now:

https://github.com/fglock/Perlito/blob/master/src5/lib/Perlito5/Javascript2/IO.pm#L486

2015-11-03 17:55 GMT+01:00 kurpitsa notifications@github.com:

I think the solution above reflects what the user might expect. Perhaps it could go for console log as described in the link unless the write function is already defined.

— Reply to this email directly or view it on GitHub https://github.com/fglock/Perlito/issues/32#issuecomment-153415628.