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# Copyright (C) 2001-2004 Python Software Foundation
# Author: Barry Warsaw, Thomas Wouters, Anthony Baxter
# Contact: email-sig@python.org
"""A parser of RFC 2822 and MIME email messages."""
import re
from cStringIO import StringIO
from email.FeedParser import FeedParser
from email.Message import Message
NLCRE = re.compile('\r\n|\r|\n')
class Parser:
def __init__(self, _class=Message, strict=False):
"""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.
Optional strict tells the parser to be strictly RFC compliant or to be
more forgiving in parsing of ill-formatted MIME documents. When
non-strict mode is used, the parser will try to make up for missing or
erroneous boundaries and other peculiarities seen in the wild.
Default is non-strict parsing.
"""
self._class = _class
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)
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)
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