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chromatic (983)

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Journal of chromatic (983)

Wednesday March 12, 2008
05:09 PM

Perl 6 Design Minutes for 05 March 2008

[ #35899 ]

The Perl 6 design team met by phone on 05 March 2008. Larry, Allison, Jerry, Will, and chromatic attended.


  • very little official work appeared to get done this week
  • corresponded with Simon, Allison, and Patrick on a possible implementation of grapheme-oriented encoding
  • looks good there
  • no real spec work thanks to health issues, day job, and my daughter and son in law visiting
  • working on the gimme5 translation of the standard grammar
  • working on the correct way to extract matches, given a current match state
  • how to present them to the user
  • ... through the constraints of the Perl 5 type system which really dislikes having capture objects...
  • went down one dead end
  • digging my way out of that
  • also working with putter, who's trying to pull together threads around the concept of a unified AST
  • that's a valuable work
  • trying to encourage him in that


  • launched the security PDD
  • reviewed Simon's first draft of the character sets PDD
  • includes an interesting new way of representing graphemes
  • we've gone through various names
  • UCS-4/NFG seems to be the most comprehensive name
  • finalizing a few details now on the PMC branch
  • we plan to merge that in on Saturday
  • tracking down one segfault on Windows
  • prevents PGE from compiling to bytecode


  • focusing on Summer of Code applications
  • I volunteered to manage Parrot and Rakudo projects
  • submitted as part of TPF
  • working with Eric Wilhelm, who really has his act together
  • Will will be my backup
  • good to have backups for all of our positions
  • trying to offload some of my tasks to other willing hackers
  • one of those is the YAML serialization
  • hope to give that over to Will or Stephen Weeks this week
  • spending the rest of my time debugging PDD 17 branch on Windows with Allison


  • working on Tcl on the PDD 17 branch
  • nothing particularly Perl 6-y


  • fixed the HLL segfaults
  • fixed a segfault in the copy opcode
  • this seems to have fixed most of Tcl and Lua
  • did more work on the PDD 17 PMC update
  • made a list of potential tasks for sponsored development


  • does Moose buy you anything on Perl 5, Larry?


  • possibly
  • can it easily produce an object which has all of hash, scalar, and array interfaces simultaneously?


  • I don't know that offhand
  • I know someone who does though


  • my problems are not so much the implementation as on the conceptual end
  • getting my brain around what a match object is
  • when you say make something or other, how much that replaces what's there and how much that augments the scalar part of what's there
  • trying to think through that
  • the main issue that I have is confusing the harvesting of subnodes with the stacking up of subnodes at the same level
  • the latter should make lists of matches rather than embedding them
  • just a matter of getting a translation to Perl that will do that once I've thought it through
  • maybe Moose will help me there
  • it's a good idea
  • it might run slower
  • my purpose in translating to Perl 5 is not to get a perfect translation but just to get one that will run the standard grammar
  • doesn't have to be pretty
  • only correct enough in the areas that matter to get it to run
  • if correctness were a bigger goal, I'd certainly use Moose
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