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#14731: refactor email policy framework.

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This patch primarily does two things: (1) it adds some internal-interface
methods to Policy that allow for Policy to control the parsing and folding of
headers in such a way that we can construct a backward compatibility policy
that is 100% compatible with the 3.2 API, while allowing a new policy to
implement the email6 API.  (2) it adds that backward compatibility policy and
refactors the test suite so that the only differences between the 3.2
test_email.py file and the 3.3 test_email.py file is some small changes in
test framework and the addition of tests for bugs fixed that apply to the 3.2
API.

There are some additional teaks, such as moving just the code needed for the
compatibility policy into _policybase, so that the library code can import
only _policybase.  That way the new code that will be added for email6
will only get imported when a non-compatibility policy is imported.
This commit is contained in:
R David Murray 2012-05-25 15:01:48 -04:00
parent 9242c1378f
commit c27e52265b
15 changed files with 1391 additions and 519 deletions
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4
Lib/email/utils.py
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@ -57,6 +57,10 @@ TICK = "'"
specialsre = re.compile(r'[][\\()<>@,:;".]')
escapesre = re.compile(r'[\\"]')
# How to figure out if we are processing strings that come from a byte
# source with undecodable characters.
_has_surrogates = re.compile(
'([^\ud800-\udbff]|\A)[\udc00-\udfff]([^\udc00-\udfff]|\Z)').search
# Helpers