Power Assert and perl.js

Power Assert
YAPC::ASIA 2013, 9/20, Kanagawa
Fuji Goro (gfx) <gfuji@cpan.org>
13年9月20日金曜日

perl.js Fuji Goro (gfx) YAPC::Asia 2013
myself
Working at COOKPAD, Inc.
Rubyist / Androider / JSXer
CPAN:
Xslate
Mouse
Plack::Middleware::DevFavicon

Power Assert
http://dontmindthelanguage.wordpress.com/
2009/12/11/groovy-1-7-power-assert/
Invented in Groovy
Ported to JavaScript by @t_wata, 2013
Ported to Perl by @tokurhiom, 2013

Test::Power
expect { $x->is_foo }
expect { $x->foo eq ‘bar’ }

FAILURE MESSAGES
not ok 1 - L7 : expect { $h->foo->bar == 42 };
# $h->foo
# => undef
# $h
# => bless( {}, 'main' )

END
Part 1. End.

Part 2.
perl.js - Perl 5.18.1 running on browsers
build with emscripten

Demo
http://gfx.github.io/perl.js/

Emscripten
LLVM to JavaScript compiler
Compile LLVM bitcode into JavaScript

Emscripten
Use JavaScript as a machine code
Like a kernel & CPU, not an emulator nor
translator
All the syscalls are implemented in the
emscripten runtime libraries

For example: fork(2)
// src/library.js
fork: function() {
// pid_t fork(void);
// We don't support multiple
processes.
___setErrNo(ERRNO_CODES.EAGAIN);
return -1;
},
Most POSIX syscalls are just dummies :(

utime(2)
// src/library_fs.js
utime: function(path, atime, mtime) {
var lookup = FS.lookupPath(path,
{ follow: true });
var node = lookup.node;
node.node_ops.setattr(node, {
timestamp: Math.max(atime, mtime)
});
},
Emscripten has a virtual file system

BuilD PERL
Write own Makeﬁle based on Makeﬁle.micro
cf. pl! - Perl 5.16.3 based emscripten-ed perl

Problems
Does not support call main() more than twice
exit() closes stdin, stdout, stderr but there’s
no way to open them again
Fatal errors which cause abort() breaks the
internal state, which then needs to reload the
page (the JavaScript interpreter)

Conclusion
Use emscripten for C/C++ applications
Write once, run everywhere

END
http://github.com/gfx/perl.js

Power Assert and perl.js

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