AppPkg/Applications/Python/Python-2.7.2/Lib/email/parser.py

   1 # Copyright (C) 2001-2006 Python Software Foundation
   2 # Author: Barry Warsaw, Thomas Wouters, Anthony Baxter
   3 # Contact: email-sig@python.org
   4
   5 """A parser of RFC 2822 and MIME email messages."""
   6
   7 __all__ = ['Parser', 'HeaderParser']
   8
   9 import warnings
  10 from cStringIO import StringIO
  11
  12 from email.feedparser import FeedParser
  13 from email.message import Message
  14
  15
  16 \f
  17 class Parser:
  18     def __init__(self, *args, **kws):
  19         """Parser of RFC 2822 and MIME email messages.
  20
  21         Creates an in-memory object tree representing the email message, which
  22         can then be manipulated and turned over to a Generator to return the
  23         textual representation of the message.
  24
  25         The string must be formatted as a block of RFC 2822 headers and header
  26         continuation lines, optionally preceeded by a `Unix-from' header.  The
  27         header block is terminated either by the end of the string or by a
  28         blank line.
  29
  30         _class is the class to instantiate for new message objects when they
  31         must be created.  This class must have a constructor that can take
  32         zero arguments.  Default is Message.Message.
  33         """
  34         if len(args) >= 1:
  35             if '_class' in kws:
  36                 raise TypeError("Multiple values for keyword arg '_class'")
  37             kws['_class'] = args[0]
  38         if len(args) == 2:
  39             if 'strict' in kws:
  40                 raise TypeError("Multiple values for keyword arg 'strict'")
  41             kws['strict'] = args[1]
  42         if len(args) > 2:
  43             raise TypeError('Too many arguments')
  44         if '_class' in kws:
  45             self._class = kws['_class']
  46             del kws['_class']
  47         else:
  48             self._class = Message
  49         if 'strict' in kws:
  50             warnings.warn("'strict' argument is deprecated (and ignored)",
  51                           DeprecationWarning, 2)
  52             del kws['strict']
  53         if kws:
  54             raise TypeError('Unexpected keyword arguments')
  55
  56     def parse(self, fp, headersonly=False):
  57         """Create a message structure from the data in a file.
  58
  59         Reads all the data from the file and returns the root of the message
  60         structure.  Optional headersonly is a flag specifying whether to stop
  61         parsing after reading the headers or not.  The default is False,
  62         meaning it parses the entire contents of the file.
  63         """
  64         feedparser = FeedParser(self._class)
  65         if headersonly:
  66             feedparser._set_headersonly()
  67         while True:
  68             data = fp.read(8192)
  69             if not data:
  70                 break
  71             feedparser.feed(data)
  72         return feedparser.close()
  73
  74     def parsestr(self, text, headersonly=False):
  75         """Create a message structure from a string.
  76
  77         Returns the root of the message structure.  Optional headersonly is a
  78         flag specifying whether to stop parsing after reading the headers or
  79         not.  The default is False, meaning it parses the entire contents of
  80         the file.
  81         """
  82         return self.parse(StringIO(text), headersonly=headersonly)
  83
  84
  85 \f
  86 class HeaderParser(Parser):
  87     def parse(self, fp, headersonly=True):
  88         return Parser.parse(self, fp, True)
  89
  90     def parsestr(self, text, headersonly=True):
  91         return Parser.parsestr(self, text, True)