JS backend is translating restricted subset of Python called RPython. This seems to be infeasible, since JS is truly a dynamic language, that's why we removed it. The other reason why we removed it, is that noone seems to be interested enough in maintaining it.
As far as I know pyjamas does not translate a subset of python, but pythonized javascript - ie it does not preserve python features, but rather tries to implement python syntax which is javascript at the bottom. Cheers, fijal On Wed, Apr 22, 2009 at 6:45 AM, Luke Kenneth Casson Leighton <l...@lkcl.net> wrote: > hi, > i was just checking http://wiki.python.org/moin/WebBrowserProgramming > specifically the python-to-javascript compiler section and was > surprised to find that the link to the "JS Using" tutorial no longer > works. on further investigation, it would appear that pypy have > completely removed all mention of javascript as a back-end from the > pypy documentation. all tutorials are gone. the demo "bnb" fails. > as the lead developer of pyjamas, the python-to-javascript compiler, > this leaves me slightly ... concerned, as it implies that pyjamas is > now the sole and exclusive free software python compiler which can be > used seriously by developers to create web applications. > what seems to be the problem? > is there a technical / language-translation issue that cannot be > overcome? someone said (on the LLVM unladen/swallow list) that adding > advanced features like metaclass support would be hard - this was > proven to be incorrect, by writing an implementation of "type()" for > pyjamas in under 24 hours and about 100 lines of javascript. pyjamas > is tiny by comparison (it uses the existing AST / Compiler module / > translator) to pypy, so there is very little actually going on, which > makes it that much easier to follow its example. the main pyjs > compiler is what... 1400 lines of python, and pyjslib.py which > contains the majority of the builtins (dict, list, tuple, str) is a > further 1400 lines. > so - what seems to be the problem? > or am i mistaken and the javascript back-end support is just in the > process of being rewritten? > l. > _______________________________________________ > pypy-dev@codespeak.net > http://codespeak.net/mailman/listinfo/pypy-dev > _______________________________________________ pypy-dev@codespeak.net http://codespeak.net/mailman/listinfo/pypy-dev
