Skip to content


Subversion checkout URL

You can clone with
Download ZIP
Fetching contributors…

Cannot retrieve contributors at this time

70 lines (38 sloc) 1.725 kB
Parser for JavaScript
Based (loosely) on language-python
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/Grammar.y
This generates src/Language/JavaScript/Parser/Grammar.hs, delete this
when done with the debug version
UTF8/Unicode version
This requires, in particular the utf8
branch, to generate the Lexer.hs file
$ git clone
$ cd Alex
$ git checkout utf8
$ cabal install
This will put a utf8 enabled alex in ~/.cabal/bin
To switch back to the standard version,
$ cabal install --reinstall alex
0.4.0 Updated JSNode to include location information, and made the parse more true to the original by leaving blocks as such, not replacing with ';'.
0.3.0 ECMA-262 edition 5 compliance. Required adding JSFunctionExpression and JSPropertyAccessor to the AST.
0.2.2 Heading toward compliance with edition 5. Trailing commas allowed in array literals too.
0.2.1 Allow trailing comma in object literal
0.2.0 ECMAScript 3 allows function expressions to have names, AST.JSFunctionExpression now reflects this
0.1.0 Simplified AST by removing JSElement and JSElementList components
0.0.3 Support for unicode in source. At the moment it only supports
UTF8 encoding, does not recognise byte order marks or UTF-16/UTF-32
0.0.2 Multiline comments were processed in greedy form, now end of
comment recognised properly. Thanks to Tony Morris for reporting this.
0.0.1 Initial release
Jump to Line
Something went wrong with that request. Please try again.