HackerReposA FIELD GUIDE TO OPEN SOURCE
ProSponsor the shelf♧ 0
← Back to top all-time
facebookarchive
lex-pass
Haskell2009–2013
facebookarchive / lex-pass · Archived

lex-pass

manipulate a php codebase using haskell to transform the abstract-syntax-tree

Explore on GitHubRead Hacker News discussions
7Distinct people
7Mentions
0Explicit recommenders
180GitHub stars
REPOSITORY AT A GLANCE

What to know before exploring

What it is

manipulate a php codebase using haskell to transform the abstract-syntax-tree

GitHub

Where it is used

No documented product use has been verified yet.

What people are saying

No recommendation phrase was found in the indexed comments.

No classified warning is attached to this page. Read the discussions before treating silence as approval.

Also in these discussions

No other repository is repeatedly linked in the same discussions.

This week on Hacker News

Nov 7–Nov 14 UTC · Direct repository links and separately labeled related project stories. Indexed through 11/14/2026, 3:56:07 PM UTC.

No direct repository links were found in the indexed HN discussions over the past seven days. Older discussions are available below.

Mentions over time

HN mentions by year7 dated mentions

Observed mentions: 2009-09-08 18:29:46 UTC to 2013-09-20 08:49:04 UTC.

0122009-01-01 00:00:00 UTC to 2010-01-01 00:00:00 UTC (exclusive): 2 mentions; 1 submissions, 1 comments20092010-01-01 00:00:00 UTC to 2011-01-01 00:00:00 UTC (exclusive): 0 mentions; 0 submissions, 0 comments2011-01-01 00:00:00 UTC to 2012-01-01 00:00:00 UTC (exclusive): 2 mentions; 0 submissions, 2 comments20112012-01-01 00:00:00 UTC to 2013-01-01 00:00:00 UTC (exclusive): 1 mentions; 0 submissions, 1 comments2013-01-01 00:00:00 UTC to 2014-01-01 00:00:00 UTC (exclusive): 2 mentions; 0 submissions, 2 comments2013

Counts come from the repository’s dated source evidence. Index cutoff: 2026-11-02 08:16:59 UTC.

View mention counts and date ranges
UTC ranges include their start and exclude their end. Select a period to filter the source evidence.
PeriodStart (UTC)End (exclusive, UTC)MentionsSubmissionsComments
20092009-01-01 00:00:00 UTC2010-01-01 00:00:00 UTC211
20102010-01-01 00:00:00 UTC2011-01-01 00:00:00 UTC000
20112011-01-01 00:00:00 UTC2012-01-01 00:00:00 UTC202
20122012-01-01 00:00:00 UTC2013-01-01 00:00:00 UTC101
20132013-01-01 00:00:00 UTC2014-01-01 00:00:00 UTC202

What Hacker News says

7 sources
omn1·Aug 30, 2013
Wait, Facebook uses Haskell? I had no idea. There is little information about the size of the codebase though. I could only dig up a talk from 2009 and a tool to modify a PHP codebase with abstract-syntax-tree transformers in Haskell [2]. Can somebody give some more insight on their internal use of the language? Anyway I think it's great that they have a hybrid codebase. With projects like HipHop and this Haskell backend it looks like they are gradually moving away from PHP as their main language. [1]: http://cufp.galois.com/2009/abstracts.html#ChristopherPiroEu... [2]: https://github.com/facebook/lex-pass/tree/master
In The Haxl Project at Facebook [pdf]
wink·Nov 22, 2012
Please note that although the latest commits on [1] were 2 months ago, for a long while it hasn't been updated and/or usable to a decent degree. It seemed to have been deprecated in favor of [2] when the original author of lex-pass left Facebook. Sorry if any of this information is a little off/incomplete, I think it's been 2 years when I oversaw a BSc paper revolving around extending lex-pass. [1]: https://github.com/facebook/lex-pass [2]: https://github.com/facebook/pfff
In Leaving Microsoft
ionfish·Sep 24, 2009
The abstract is available on the CUFP site [1]. On the Haskell in Industry page [2] of the Haskell wiki, it states that "Facebook uses some Haskell internally for tools. lex-pass [3] is a tool for programmatically manipulating a PHP code base via Haskell." [1]: http://cufp.galois.com/2009/abstracts.html#ChristopherPiroEu... [2]: http://www.haskell.org/haskellwiki/Haskell_in_industry [3]: http://github.com/facebook/lex-pass
In Functional Programming at Facebook. (30 min video, CUFP talk.)

MAKE YOURSELF AT HOME

A few shortcuts

/
Search the collection
?
Open this guide
Esc
Close dialogs and navigation

Your saved repositories and interests stay in this browser.