Parser for JavaScript, in Haskell
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test Lexer: Improve escape handling Jun 5, 2017
.ghci Builds and runs tests. Need to make test pass. Nov 24, 2010
.gitignore Update .gitignore Nov 6, 2016
Makefile Makefile: Remove profiling, cleanup May 29, 2016
Setup.hs WIP. Aiming at getting parsing infrastructure in place, based on lang… Nov 21, 2010
TODO.txt Working in comment processing. Feb 29, 2012
quickcheck.hs quickcheck.hs : Fix compile (broken due to changes in AST). Jul 26, 2015

Parser for JavaScript

Build Status

Based (loosely) on language-python

Two Versions

There are currently two versions:

  • 0.5 series : Is a continuation of the 0.5.X.Y series, from the [master] ( branch of this github repository.

  • 0.6 series : This has a vastly different and improved AST which makes if far more difficult to build an non-sensical Javascript AST. This code is in the new-ast branch of this github repository.

How to build


cabal clean && cabal configure && cabal build


cabal clean && cabal configure -fbuildtests && cabal build

Running the tests


To debug the grammar

happy -iparse.txt -g -a  -d src/Language/JavaScript/Parser/Grammar5.y

This generates src/Language/JavaScript/Parser/Grammar5.hs, delete this when done with the debug version

UTF8/Unicode version

Alex 3.0 now supports unicode natively, and has been included as a dependency in the cabal file.

Note: The generation of the lexical analyser has been separated out, to remove the install-time dependency on Alex. If any changes need to be made to the lexer, the Lexer.x source lies in src-dev, and the script will invoke Alex with the appropriate directories.