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annotate planemo/lib/python3.7/site-packages/future/backports/email/parser.py @ 1:56ad4e20f292 draft

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"planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
author guerler
date Fri, 31 Jul 2020 00:32:28 -0400
parents d30785e31577
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1 # Copyright (C) 2001-2007 Python Software Foundation
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2 # Author: Barry Warsaw, Thomas Wouters, Anthony Baxter
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3 # Contact: email-sig@python.org
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4
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5 """A parser of RFC 2822 and MIME email messages."""
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6 from __future__ import unicode_literals
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7 from __future__ import division
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8 from __future__ import absolute_import
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9
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10 __all__ = ['Parser', 'HeaderParser', 'BytesParser', 'BytesHeaderParser']
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11
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12 import warnings
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13 from io import StringIO, TextIOWrapper
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14
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15 from future.backports.email.feedparser import FeedParser, BytesFeedParser
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16 from future.backports.email.message import Message
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17 from future.backports.email._policybase import compat32
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18
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19
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20 class Parser(object):
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21 def __init__(self, _class=Message, **_3to2kwargs):
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22 """Parser of RFC 2822 and MIME email messages.
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23
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24 Creates an in-memory object tree representing the email message, which
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25 can then be manipulated and turned over to a Generator to return the
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26 textual representation of the message.
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27
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28 The string must be formatted as a block of RFC 2822 headers and header
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29 continuation lines, optionally preceeded by a `Unix-from' header. The
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30 header block is terminated either by the end of the string or by a
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31 blank line.
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32
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33 _class is the class to instantiate for new message objects when they
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34 must be created. This class must have a constructor that can take
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35 zero arguments. Default is Message.Message.
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36
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37 The policy keyword specifies a policy object that controls a number of
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38 aspects of the parser's operation. The default policy maintains
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39 backward compatibility.
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40
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41 """
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42 if 'policy' in _3to2kwargs: policy = _3to2kwargs['policy']; del _3to2kwargs['policy']
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43 else: policy = compat32
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44 self._class = _class
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45 self.policy = policy
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46
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47 def parse(self, fp, headersonly=False):
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48 """Create a message structure from the data in a file.
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49
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50 Reads all the data from the file and returns the root of the message
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51 structure. Optional headersonly is a flag specifying whether to stop
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52 parsing after reading the headers or not. The default is False,
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53 meaning it parses the entire contents of the file.
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54 """
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55 feedparser = FeedParser(self._class, policy=self.policy)
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56 if headersonly:
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57 feedparser._set_headersonly()
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58 while True:
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59 data = fp.read(8192)
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60 if not data:
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61 break
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62 feedparser.feed(data)
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63 return feedparser.close()
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64
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65 def parsestr(self, text, headersonly=False):
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66 """Create a message structure from a string.
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67
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68 Returns the root of the message structure. Optional headersonly is a
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69 flag specifying whether to stop parsing after reading the headers or
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70 not. The default is False, meaning it parses the entire contents of
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71 the file.
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72 """
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73 return self.parse(StringIO(text), headersonly=headersonly)
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74
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75
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76
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77 class HeaderParser(Parser):
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78 def parse(self, fp, headersonly=True):
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79 return Parser.parse(self, fp, True)
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80
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81 def parsestr(self, text, headersonly=True):
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82 return Parser.parsestr(self, text, True)
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83
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84
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85 class BytesParser(object):
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86
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87 def __init__(self, *args, **kw):
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88 """Parser of binary RFC 2822 and MIME email messages.
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89
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90 Creates an in-memory object tree representing the email message, which
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91 can then be manipulated and turned over to a Generator to return the
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92 textual representation of the message.
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93
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94 The input must be formatted as a block of RFC 2822 headers and header
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95 continuation lines, optionally preceeded by a `Unix-from' header. The
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96 header block is terminated either by the end of the input or by a
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97 blank line.
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98
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99 _class is the class to instantiate for new message objects when they
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100 must be created. This class must have a constructor that can take
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101 zero arguments. Default is Message.Message.
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102 """
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103 self.parser = Parser(*args, **kw)
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104
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105 def parse(self, fp, headersonly=False):
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106 """Create a message structure from the data in a binary file.
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107
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108 Reads all the data from the file and returns the root of the message
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109 structure. Optional headersonly is a flag specifying whether to stop
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110 parsing after reading the headers or not. The default is False,
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111 meaning it parses the entire contents of the file.
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112 """
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113 fp = TextIOWrapper(fp, encoding='ascii', errors='surrogateescape')
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114 with fp:
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115 return self.parser.parse(fp, headersonly)
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116
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117
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118 def parsebytes(self, text, headersonly=False):
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119 """Create a message structure from a byte string.
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120
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121 Returns the root of the message structure. Optional headersonly is a
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122 flag specifying whether to stop parsing after reading the headers or
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123 not. The default is False, meaning it parses the entire contents of
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124 the file.
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125 """
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126 text = text.decode('ASCII', errors='surrogateescape')
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127 return self.parser.parsestr(text, headersonly)
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128
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129
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130 class BytesHeaderParser(BytesParser):
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131 def parse(self, fp, headersonly=True):
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132 return BytesParser.parse(self, fp, headersonly=True)
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133
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134 def parsebytes(self, text, headersonly=True):
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135 return BytesParser.parsebytes(self, text, headersonly=True)