From: Joshua Ballanco <jballanc@...>
Date: 2012-08-03T19:21:48+09:00
Subject: [ruby-core:46958] Re: (Half-baked DRAFT) new `require' framework

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On Tuesday, July 31, 2012 at 3:29 PM, SASADA Koichi wrote:
> Now, `require' only loads `.rb' script or `.so' files from `file system'.
> 
> (Proposal-1)
> This proposal extends the current limitation of require:
> 
> (1) load script which is represented by other than `.rb' and `.so'.
> (example: pre-compiled file, encrypted file)
> 
> (2) load script from location from other than `file system'.
> (example: require from zip archive, require over network,
> require files provided by gem efficiently using file location db)
> 
> 


I'll echo what Charles said in his response: file lookup and code loading should be handled independently. I would even go so far as to say that code loading could be made an independent API from require, enabling the loading of code from memory or, say, from a network socket. 

> == Related work
> 
> === JRuby
> 
> JRuby can require file from `.jar' (and .war file? sorry i'm not sure).
> JRuby also extends file path like VFS (virtual file system). JRuby can
> open a file in a .jar file like file system.
> (JRuby GURU: Please complement this section!)
> 
> === Rubinius
> 
> Rubinius supports AOT compile (a ruby script to a compiled file).
> (Rubinius GURU: Please complement it!)
> 
> 


=== MacRuby

MacRuby has modified require to be able to load compiled and linked object files (*.rbo) like so:

Earth: ~/Desktop > echo "def foo; puts 'foo from file a.rb'; end" > a.rb
Earth: ~/Desktop > echo "require 'a'; foo" > b.rb
Earth: ~/Desktop > macrubyc -C a.rb
Earth: ~/Desktop > macrubyc -C b.rb
Earth: ~/Desktop > rm a.rb b.rb
Earth: ~/Desktop > macruby -e "require './b'"
foo from file a.rb

But, beyond that, MacRuby can also "require" a file in a compiled, linked, dynamic library:

Earth: ~/Desktop > echo "def foo; puts 'foo from file a.rb'; end" > a.rb
Earth: ~/Desktop > echo "require 'a'; foo" > b.rb                       

Earth: ~/Desktop > macrubyc a.rb b.rb -o ab.dylib --dylib

Earth: ~/Desktop > rm a.* b.*

Earth: ~/Desktop > echo "require 'b'" > c.rb

Earth: ~/Desktop > macrubyc c.rb ab.dylib -o awesome

Earth: ~/Desktop > ./awesome
foo from file a.rb


Right now, we accomplish this with a variety of "tricks" (i.e. features of OS X's dynamic loader), but it would be nice to have a more formalized API for doing the same thing.
 

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                <div style=3D=22font-family: Helvetica; font-size: 13px; =
=22><span style=3D=22color: rgb(160, 160, 168); =22>On Tuesday, July 31, =
2012 at 3:29 PM, SASADA Koichi wrote:</span></div>
                <blockquote type=3D=22cite=22 style=3D=22border-left-styl=
e:solid;border-width:1px;margin-left:0px;padding-left:10px;=22>Now, =60re=
quire' only loads =60.rb' script or =60.so' files from =60file system'.<s=
pan><div><div><div><br></div><div>(Proposal-1)</div><div>This proposal ex=
tends the current limitation of require:</div><div><br></div><div>  (1) l=
oad script which is represented by other than =60.rb' and =60.so'.</div><=
div>    (example: pre-compiled file, encrypted file)</div><div><br></div>=
<div>  (2) load script from location from other than =60file system'.</di=
v><div>    (example: require from zip archive, require over network,</div=
><div>     require files provided by gem efficiently using file location =
db)</div></div></div></span></blockquote><div><br></div><div>I'll echo wh=
at Charles said in his response: file lookup and code loading should be h=
andled independently. I would even go so far as to say that code loading =
could be made an independent API from require, enabling the loading of co=
de from memory or, say, from a network socket.&nbsp;</div><div><br></div>=
<blockquote type=3D=22cite=22 style=3D=22border-left-style:solid;border-w=
idth:1px;margin-left:0px;padding-left:10px;=22>=3D=3D Related work<span><=
div><div><div><br></div><div>=3D=3D=3D JRuby</div><div><br></div><div>JRu=
by can require file from =60.jar' (and .war file=3F sorry i'm not sure).<=
/div><div> JRuby also extends file path like V=46S (virtual file system).=
  JRuby can</div><div>open a file in a .jar file like file system.</div><=
div>(JRuby GURU: Please complement this section=21)</div><div><br></div><=
div>=3D=3D=3D Rubinius</div><div><br></div><div>Rubinius supports AOT com=
pile (a ruby script to a compiled file).</div><div>(Rubinius GURU: Please=
 complement it=21)</div></div></div></span></blockquote><div><br></div><d=
iv>=3D=3D=3D MacRuby</div><div><br></div><div>MacRuby has modified requir=
e to be able to load compiled and linked object files (*.rbo) like so:</d=
iv><div><br></div><div>Earth: =7E/Desktop &gt; echo =22def foo; puts 'foo=
 from file a.rb'; end=22 &gt; a.rb</div><div>Earth: =7E/Desktop &gt; echo=
 =22require 'a'; foo=22 &gt; b.rb</div><div>Earth: =7E/Desktop &gt; macru=
byc -C a.rb</div><div>Earth: =7E/Desktop &gt; macrubyc -C b.rb</div><div>=
Earth: =7E/Desktop &gt; rm a.rb b.rb</div><div>Earth: =7E/Desktop &gt; ma=
cruby -e =22require './b'=22</div><div>foo from file a.rb</div><div><br><=
/div><div>But, beyond that, MacRuby can also =22require=22 a file in a co=
mpiled, linked, dynamic library:</div><div><br></div><div><div>Earth: =7E=
/Desktop &gt; echo =22def foo; puts 'foo from file a.rb'; end=22 &gt; a.r=
b</div></div><div><div>Earth: =7E/Desktop &gt; echo =22require 'a'; foo=22=
 &gt; b.rb &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;=
 &nbsp; &nbsp;&nbsp;</div></div><div><div>Earth: =7E/Desktop &gt; macruby=
c a.rb b.rb -o ab.dylib --dylib</div></div><div><div>Earth: =7E/Desktop &=
gt; rm a.* b.*</div></div><div><div>Earth: =7E/Desktop &gt; echo =22requi=
re 'b'=22 &gt; c.rb</div></div><div><div>Earth: =7E/Desktop &gt; macrubyc=
 c.rb ab.dylib -o awesome</div></div><div><div>Earth: =7E/Desktop &gt; ./=
awesome</div><div>foo from file a.rb</div></div><div><br></div><div>Right=
 now, we accomplish this with a variety of =22tricks=22 (i.e. features of=
 OS X's dynamic loader), but it would be nice to have a more formalized A=
PI for doing the same thing.</div><div>&nbsp;</div>
            
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