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A compiler for PEP 345 environment markers.

Project description

markerlib

Compile or interpret PEP 345 environment markers.

Usage:

>>> import markerlib
>>> marker = markerlib.compile("os.name == 'posix'")
>>> marker(environment=markerlib.default_environment(),
           override={'os.name':'posix'})
True
>>> marker(environment=markerlib.default_environment(),
           override={'os.name':'nt'})
False

The implementation uses the ast to compile environment markers as Python statements with a limited set of allowed node types.

0.4

  • Cache compiled marker functions with weakref.WeakValueDictionary
  • Rename markerlib.as_function to markerlib.compile

0.3

  • Might work on Python 2.5 (includes needed parts of the ast module from Python 2.6+)
  • Include 100% test coverage, tox config file

0.1

  • Initial version

Project details


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Files for markerlib, version 0.4
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