[Python-Dev] AST optimizer implemented in Python

Eric Snow ericsnowcurrently at gmail.com
Mon Aug 13 00:07:45 CEST 2012

On Aug 12, 2012 12:56 PM, "PJ Eby" <pje at telecommunity.com> wrote:
> I'm not sure if this is directly related or not, but making this
> mechanism support custom compilation for new filename suffixes would
> be nice, especially for various e.g. HTML/XML templating systems that
> compile to Python or bytecode.
> Specifically, having a way to add a new source suffix (e.g. ".kid",
> ".zpt", etc.) and a matching compilation function, such that it's
> automatically picked up for compilation by both the filesystem and zip
> importers would be awesome.  It'd also allow for DSLs and syntax
> experiments using alternative filename extensions.


I'm hacking around this right now for a project I'm working on.  I
definitely do this through the import system.  Inserting a look-alike path
hook and monkeypatching the cached path entry finders is not difficult, but
certainly fragile and less than ideal.

Consequently I've been looking into simple and not-so-simple solutions to
making it easier to add new suffixes to be handled.  The
source/pyc-to-code-to-module path during imports is so prevalent and
critical that it may benefit from its own model.  This is similar to how
the path-based import subsystem has its own special-case model.  Or
source-based imports just need better special-casing in the path-based
import subsystem.  Perhaps just adding and using sys.source_suffixes as a
mapping of suffixes to loader classes.

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