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# 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 preceded 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 preceded 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)

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