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Requirements file parsing
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Vq� WqO Wd S( s� Parse a requirements file and yield InstallRequirement instances.
:param filename: Path or url of requirements file.
:param finder: Instance of pip.index.PackageFinder.
:param comes_from: Origin description of requirements.
:param options: cli options.
:param session: Instance of pip.download.PipSession.
:param constraint: If true, parsing a constraint file rather than
requirements file.
:param wheel_cache: Instance of pip.wheel.WheelCache
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c C@ sC t | j � d d �} t | � } t | � } t | | � } | S( s� Split, filter, and join lines, and return a line iterator
:param content: the content of the requirements file
:param options: cli options
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j9 D� � qPn d S( s# Process a single requirements line; This can result in creating/yielding
requirements, or updating the finder.
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.
:param constraint: If True, parsing a constraints file.
:param options: OptionParser options that we may update
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Return a parser for parsing requirement lines
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Skip lines that match '--skip-requirements-regex' pattern
Note: the regex pattern is only built once
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