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