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Requirements file parsing
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c@ sq t | � } t | | | � } xL | j | | � D]8 } t | d | d | d | �} | d k r1 | Vq1 q1 Wd S( s� Parse a requirements file and yield ParsedRequirement instances.
:param filename: Path or url of requirements file.
:param session: PipSession instance.
:param finder: Instance of pip.index.PackageFinder.
:param comes_from: Origin description of requirements.
:param options: cli options.
:param constraint: If true, parsing a constraint file rather than
requirements file.
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:param content: the content of the requirements file
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c C@ sF | j r t | | � } | St | j | j | j | | | � d Sd S( s Handle a single parsed requirements line; This can result in
creating/yielding requirements, or updating the finder.
:param line: The parsed line to be processed.
:param options: CLI options.
:param finder: The finder - updated by non-requirement lines.
:param session: The session - updated by non-requirement lines.
Returns a ParsedRequirement object if the line is a requirement line,
otherwise returns None.
For lines that contain requirements, the only options that have an effect
are from SUPPORTED_OPTIONS_REQ, and they are scoped to the
requirement. Other options from SUPPORTED_OPTIONS may be present, but are
ignored.
For lines that do not contain requirements, the only options that have an
effect are from SUPPORTED_OPTIONS. Options from SUPPORTED_OPTIONS_REQ may
be present, but are ignored. These lines may contain multiple options
(although our docs imply only one is supported), and all our parsed and
affect the finder.
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parse_line� s ( ( R, R� ( ( R, s� /builddir/build/BUILDROOT/alt-python27-pip-20.2.4-5.el8.x86_64/opt/alt/python27/lib/python2.7/site-packages/pip/_internal/req/req_file.pyR. � s c C@ s� | j d � } g } | } xJ | D]B } | j d � sG | j d � rK Pq# | j | � | j d � q# Wd j | � d j | � f S( s� Break up the line into an args and options string. We only want to shlex
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Return a parser for parsing requirement lines
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c c@ ss xl | D]d \ } } xJ t j | � D]9 \ } } t j | � } | sJ q# n | j | | � } q# W| | f Vq Wd S( s� Replace all environment variables that can be retrieved via `os.getenv`.
The only allowed format for environment variables defined in the
requirement file is `${MY_VARIABLE_1}` to ensure two things:
1. Strings that contain a `$` aren't accidentally (partially) expanded.
2. Ensure consistency across platforms for requirement files.
These points are the result of a discussion on the `github pull
request #3514 <https://github.com/pypa/pip/pull/3514>`_.
Valid characters in variable names follow the `POSIX standard
<http://pubs.opengroup.org/onlinepubs/9699919799/>`_ and are limited
to uppercase letter, digits and the `_` (underscore).
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ry} t d j | � � � n X| | f S( sZ Gets the content of a file; it may be a filename, file: URL, or
http: URL. Returns (location, content). Content is unicode.
Respects # -*- coding: declarations on the retrieved files.
:param url: File path or url.
:param session: PipSession instance.
:param comes_from: Origin description of requirements.
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