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Transforms for PEP processing.
- `Headers`: Used to transform a PEP's initial RFC-2822 header. It remains a
field list, but some entries get processed.
- `Contents`: Auto-inserts a table of contents.
- `PEPZero`: Special processing for PEP 0.
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Process fields in a PEP's initial RFC-2822 header.
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Insert an empty table of contents topic and a transform placeholder into
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Locate the "References" section, insert a placeholder for an external
target footnote insertion transform at the end, and schedule the
transform to run immediately.
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Remove an empty "References" section.
Called after the `references.TargetNotes` transform is complete.
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Perform the special processing needed by PEP 0:
- Mask email addresses.
- Link PEP numbers in the second column of 4-column tables to the PEPs
themselves.
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Mask the email address in `ref` and return a replacement node.
`ref` is returned unchanged if it contains no email address.
For email addresses such as "user@host", mask the address as "user at
host" (text) to thwart simple email address harvesters (except for those
listed in `non_masked_addresses`). If a PEP number (`pepno`) is given,
return a reference including a default email subject.
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