132 lines
4.9 KiB
Python
132 lines
4.9 KiB
Python
# Copyright (C) 2001-2007 Python Software Foundation
|
||
# Author: Barry Warsaw, Thomas Wouters, Anthony Baxter
|
||
# Contact: email-sig@python.org
|
||
|
||
"""A parser of RFC 2822 and MIME email messages."""
|
||
|
||
__all__ = ['Parser', 'HeaderParser', 'BytesParser', 'BytesHeaderParser',
|
||
'FeedParser', 'BytesFeedParser']
|
||
|
||
from io import StringIO, TextIOWrapper
|
||
|
||
from email.feedparser import FeedParser, BytesFeedParser
|
||
from email._policybase import compat32
|
||
|
||
|
||
|
||
class Parser:
|
||
def __init__(self, _class=None, *, policy=compat32):
|
||
"""Parser of RFC 2822 and MIME email messages.
|
||
|
||
Creates an in-memory object tree representing the email message, which
|
||
can then be manipulated and turned over to a Generator to return the
|
||
textual representation of the message.
|
||
|
||
The string must be formatted as a block of RFC 2822 headers and header
|
||
continuation lines, optionally preceeded by a `Unix-from' header. The
|
||
header block is terminated either by the end of the string or by a
|
||
blank line.
|
||
|
||
_class is the class to instantiate for new message objects when they
|
||
must be created. This class must have a constructor that can take
|
||
zero arguments. Default is Message.Message.
|
||
|
||
The policy keyword specifies a policy object that controls a number of
|
||
aspects of the parser's operation. The default policy maintains
|
||
backward compatibility.
|
||
|
||
"""
|
||
self._class = _class
|
||
self.policy = policy
|
||
|
||
def parse(self, fp, headersonly=False):
|
||
"""Create a message structure from the data in a file.
|
||
|
||
Reads all the data from the file and returns the root of the message
|
||
structure. Optional headersonly is a flag specifying whether to stop
|
||
parsing after reading the headers or not. The default is False,
|
||
meaning it parses the entire contents of the file.
|
||
"""
|
||
feedparser = FeedParser(self._class, policy=self.policy)
|
||
if headersonly:
|
||
feedparser._set_headersonly()
|
||
while True:
|
||
data = fp.read(8192)
|
||
if not data:
|
||
break
|
||
feedparser.feed(data)
|
||
return feedparser.close()
|
||
|
||
def parsestr(self, text, headersonly=False):
|
||
"""Create a message structure from a string.
|
||
|
||
Returns the root of the message structure. Optional headersonly is a
|
||
flag specifying whether to stop parsing after reading the headers or
|
||
not. The default is False, meaning it parses the entire contents of
|
||
the file.
|
||
"""
|
||
return self.parse(StringIO(text), headersonly=headersonly)
|
||
|
||
|
||
|
||
class HeaderParser(Parser):
|
||
def parse(self, fp, headersonly=True):
|
||
return Parser.parse(self, fp, True)
|
||
|
||
def parsestr(self, text, headersonly=True):
|
||
return Parser.parsestr(self, text, True)
|
||
|
||
|
||
class BytesParser:
|
||
|
||
def __init__(self, *args, **kw):
|
||
"""Parser of binary RFC 2822 and MIME email messages.
|
||
|
||
Creates an in-memory object tree representing the email message, which
|
||
can then be manipulated and turned over to a Generator to return the
|
||
textual representation of the message.
|
||
|
||
The input must be formatted as a block of RFC 2822 headers and header
|
||
continuation lines, optionally preceeded by a `Unix-from' header. The
|
||
header block is terminated either by the end of the input or by a
|
||
blank line.
|
||
|
||
_class is the class to instantiate for new message objects when they
|
||
must be created. This class must have a constructor that can take
|
||
zero arguments. Default is Message.Message.
|
||
"""
|
||
self.parser = Parser(*args, **kw)
|
||
|
||
def parse(self, fp, headersonly=False):
|
||
"""Create a message structure from the data in a binary file.
|
||
|
||
Reads all the data from the file and returns the root of the message
|
||
structure. Optional headersonly is a flag specifying whether to stop
|
||
parsing after reading the headers or not. The default is False,
|
||
meaning it parses the entire contents of the file.
|
||
"""
|
||
fp = TextIOWrapper(fp, encoding='ascii', errors='surrogateescape')
|
||
try:
|
||
return self.parser.parse(fp, headersonly)
|
||
finally:
|
||
fp.detach()
|
||
|
||
|
||
def parsebytes(self, text, headersonly=False):
|
||
"""Create a message structure from a byte string.
|
||
|
||
Returns the root of the message structure. Optional headersonly is a
|
||
flag specifying whether to stop parsing after reading the headers or
|
||
not. The default is False, meaning it parses the entire contents of
|
||
the file.
|
||
"""
|
||
text = text.decode('ASCII', errors='surrogateescape')
|
||
return self.parser.parsestr(text, headersonly)
|
||
|
||
|
||
class BytesHeaderParser(BytesParser):
|
||
def parse(self, fp, headersonly=True):
|
||
return BytesParser.parse(self, fp, headersonly=True)
|
||
|
||
def parsebytes(self, text, headersonly=True):
|
||
return BytesParser.parsebytes(self, text, headersonly=True)
|