o

O�Ib��@sDdZd
dl
Z
e
�de
j�Ze
�de
j�ZGdd�de�Zdd�ZdS)	z�
Handle Environment Markers
https://www.python.org/dev/peps/pep-0508/#environment-markers

TODO: Ideally replace with the packaging library, but the API is currently
private: https://github.com/pypa/packaging/issues/496
�Nz�
    (?P<marker>[a-z_]+)
    \s*
    (?P<op><=?|>=?|[=!~]=|===)
    \s*
    (?P<quote>['"])
    (?P<value>.*)  # Could contain additional markers
    (?P=quote)
    z0
    (?:\s|\))
    (?:and|or)
    (?:\s|\()
    c
@seZ
dZd
S)�ComplexEnvironmentMarkerN)�__name__�
__module__�__qualname__�rr�(/usr/share/dh-python/dhpython/markers.pyr0s
rc
Csp|��}|�
d
�
r|�d�
r|dd���}t�|�
}
|
r t��
t�|�
}
|
s*t��
|
�d�
|
�d�
|
�d�
fS)z5Parse a simple marker of <= 1 environment restriction�
(�
)�
����marker�op�value)	�strip�
startswith�endswith�COMPLEX_ENV_MARKER_RE�searchr�SIMPLE_ENV_MARKER_RE�match�group)r�
mrrr�parse_environment_marker4s









�r)	�__doc__�re�compile�VERBOSErr�	Exceptionrrrrrr�<module>
s�	�