Language-python provides a parser (and lexer) for Python written in
Haskell. Currently it only supports version 3 of Python (the most
recent version), but it will support version 2 in the future.
The parser is implemented using Happy, and the lexer is implemented
using Alex.
Web page: http://projects.haskell.org/language-python/
Hackage:
http://hackage.haskell.org/cgi-bin/hackage-scripts/package/language-python
Darcs: darcs get http://code.haskell.org/language-python/
Example:
$ ghci
Prelude> :m Language.Python.Version3.Parser
Prelude Language.Python.Version3.Parser> parseModule "def inc(x):
return x + 1\n" []
Right (Module [Fun {fun_name = Ident "inc", fun_args = [Param
{param_name = Ident "x", param_annotation = Nothing, param_default =
Nothing}], fun_result_annotation = Nothing, fun_body = [Return
{return_expr = Just (BinaryOp {operator = Plus, left_op_arg = Var
(Ident "x"), right_op_arg = Int 1})}]}])
Prelude Language.Python.Version3.Parser> :m
Language.Python.Version3.Lexer
Prelude Language.Python.Version3.Lexer> lexOneToken "def inc(x):
return x + 1\n" []
Right (Def (Sloc {sloc_filename = "", sloc_row = 1, sloc_column =
1})," inc(x): return x + 1\n")
This is the first release of the package (version 0.1.1) and there is
still much to be improved, in particular:
- Unicode support is incomplete.
- Source locations are sub-optimal, and will eventually become
source spans.
- The pretty printer needs polish.
- The parser only supports version 3 of Python. Support for
Version 2 is a major goal, and should be straightforward.
- Only minimal performance tuning and correctness testing has been
performed. Version 0.1.1 is not intended for production use.
Cheers,
Bernie.
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