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annotate venv/lib/python2.7/site-packages/docutils/io.py @ 0:d67268158946 draft

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planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
author bcclaywell
date Mon, 12 Oct 2015 17:43:33 -0400
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1 # $Id: io.py 7596 2013-01-25 13:42:17Z milde $
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2 # Author: David Goodger <goodger@python.org>
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3 # Copyright: This module has been placed in the public domain.
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4
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5 """
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6 I/O classes provide a uniform API for low-level input and output. Subclasses
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7 exist for a variety of input/output mechanisms.
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8 """
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9
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10 __docformat__ = 'reStructuredText'
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11
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12 import sys
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13 import os
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14 import re
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15 import codecs
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16 from docutils import TransformSpec
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17 from docutils._compat import b
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18 from docutils.utils.error_reporting import locale_encoding, ErrorString, ErrorOutput
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19
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20
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21 class InputError(IOError): pass
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22 class OutputError(IOError): pass
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23
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24 def check_encoding(stream, encoding):
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25 """Test, whether the encoding of `stream` matches `encoding`.
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26
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27 Returns
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28
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29 :None: if `encoding` or `stream.encoding` are not a valid encoding
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30 argument (e.g. ``None``) or `stream.encoding is missing.
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31 :True: if the encoding argument resolves to the same value as `encoding`,
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32 :False: if the encodings differ.
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33 """
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34 try:
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35 return codecs.lookup(stream.encoding) == codecs.lookup(encoding)
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36 except (LookupError, AttributeError, TypeError):
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37 return None
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38
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39
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40 class Input(TransformSpec):
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41
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42 """
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43 Abstract base class for input wrappers.
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44 """
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45
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46 component_type = 'input'
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47
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48 default_source_path = None
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49
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50 def __init__(self, source=None, source_path=None, encoding=None,
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51 error_handler='strict'):
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52 self.encoding = encoding
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53 """Text encoding for the input source."""
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54
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55 self.error_handler = error_handler
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56 """Text decoding error handler."""
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57
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58 self.source = source
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59 """The source of input data."""
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60
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61 self.source_path = source_path
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62 """A text reference to the source."""
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63
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64 if not source_path:
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65 self.source_path = self.default_source_path
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66
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67 self.successful_encoding = None
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68 """The encoding that successfully decoded the source data."""
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69
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70 def __repr__(self):
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71 return '%s: source=%r, source_path=%r' % (self.__class__, self.source,
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72 self.source_path)
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73
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74 def read(self):
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75 raise NotImplementedError
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76
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77 def decode(self, data):
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78 """
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79 Decode a string, `data`, heuristically.
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80 Raise UnicodeError if unsuccessful.
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81
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82 The client application should call ``locale.setlocale`` at the
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83 beginning of processing::
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84
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85 locale.setlocale(locale.LC_ALL, '')
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86 """
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87 if self.encoding and self.encoding.lower() == 'unicode':
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88 assert isinstance(data, unicode), (
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89 'input encoding is "unicode" '
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90 'but input is not a unicode object')
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91 if isinstance(data, unicode):
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92 # Accept unicode even if self.encoding != 'unicode'.
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93 return data
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94 if self.encoding:
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95 # We believe the user/application when the encoding is
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96 # explicitly given.
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97 encodings = [self.encoding]
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98 else:
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99 data_encoding = self.determine_encoding_from_data(data)
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100 if data_encoding:
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101 # If the data declares its encoding (explicitly or via a BOM),
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102 # we believe it.
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103 encodings = [data_encoding]
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104 else:
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105 # Apply heuristics only if no encoding is explicitly given and
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106 # no BOM found. Start with UTF-8, because that only matches
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107 # data that *IS* UTF-8:
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108 encodings = ['utf-8', 'latin-1']
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109 if locale_encoding:
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110 encodings.insert(1, locale_encoding)
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111 for enc in encodings:
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112 try:
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113 decoded = unicode(data, enc, self.error_handler)
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114 self.successful_encoding = enc
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115 # Return decoded, removing BOMs.
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116 return decoded.replace(u'\ufeff', u'')
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117 except (UnicodeError, LookupError), err:
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118 error = err # in Python 3, the <exception instance> is
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119 # local to the except clause
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120 raise UnicodeError(
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121 'Unable to decode input data. Tried the following encodings: '
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122 '%s.\n(%s)' % (', '.join([repr(enc) for enc in encodings]),
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123 ErrorString(error)))
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124
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125 coding_slug = re.compile(b("coding[:=]\s*([-\w.]+)"))
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126 """Encoding declaration pattern."""
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127
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128 byte_order_marks = ((codecs.BOM_UTF8, 'utf-8'), # 'utf-8-sig' new in v2.5
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129 (codecs.BOM_UTF16_BE, 'utf-16-be'),
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130 (codecs.BOM_UTF16_LE, 'utf-16-le'),)
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131 """Sequence of (start_bytes, encoding) tuples for encoding detection.
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132 The first bytes of input data are checked against the start_bytes strings.
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133 A match indicates the given encoding."""
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134
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135 def determine_encoding_from_data(self, data):
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136 """
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137 Try to determine the encoding of `data` by looking *in* `data`.
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138 Check for a byte order mark (BOM) or an encoding declaration.
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139 """
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140 # check for a byte order mark:
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141 for start_bytes, encoding in self.byte_order_marks:
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142 if data.startswith(start_bytes):
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143 return encoding
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144 # check for an encoding declaration pattern in first 2 lines of file:
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145 for line in data.splitlines()[:2]:
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146 match = self.coding_slug.search(line)
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147 if match:
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148 return match.group(1).decode('ascii')
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149 return None
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150
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151
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152 class Output(TransformSpec):
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153
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154 """
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155 Abstract base class for output wrappers.
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156 """
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157
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158 component_type = 'output'
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159
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160 default_destination_path = None
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161
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162 def __init__(self, destination=None, destination_path=None,
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163 encoding=None, error_handler='strict'):
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164 self.encoding = encoding
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165 """Text encoding for the output destination."""
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166
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167 self.error_handler = error_handler or 'strict'
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168 """Text encoding error handler."""
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169
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170 self.destination = destination
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171 """The destination for output data."""
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172
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173 self.destination_path = destination_path
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174 """A text reference to the destination."""
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175
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176 if not destination_path:
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177 self.destination_path = self.default_destination_path
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178
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179 def __repr__(self):
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180 return ('%s: destination=%r, destination_path=%r'
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181 % (self.__class__, self.destination, self.destination_path))
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182
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183 def write(self, data):
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184 """`data` is a Unicode string, to be encoded by `self.encode`."""
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185 raise NotImplementedError
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186
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187 def encode(self, data):
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188 if self.encoding and self.encoding.lower() == 'unicode':
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189 assert isinstance(data, unicode), (
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190 'the encoding given is "unicode" but the output is not '
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191 'a Unicode string')
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192 return data
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193 if not isinstance(data, unicode):
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194 # Non-unicode (e.g. bytes) output.
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195 return data
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196 else:
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197 return data.encode(self.encoding, self.error_handler)
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198
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199
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200 class FileInput(Input):
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201
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202 """
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203 Input for single, simple file-like objects.
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204 """
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205 def __init__(self, source=None, source_path=None,
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206 encoding=None, error_handler='strict',
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207 autoclose=True, handle_io_errors=None, mode='rU'):
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208 """
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209 :Parameters:
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210 - `source`: either a file-like object (which is read directly), or
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211 `None` (which implies `sys.stdin` if no `source_path` given).
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212 - `source_path`: a path to a file, which is opened and then read.
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213 - `encoding`: the expected text encoding of the input file.
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214 - `error_handler`: the encoding error handler to use.
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215 - `autoclose`: close automatically after read (except when
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216 `sys.stdin` is the source).
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217 - `handle_io_errors`: ignored, deprecated, will be removed.
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218 - `mode`: how the file is to be opened (see standard function
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219 `open`). The default 'rU' provides universal newline support
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220 for text files.
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221 """
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222 Input.__init__(self, source, source_path, encoding, error_handler)
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223 self.autoclose = autoclose
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224 self._stderr = ErrorOutput()
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225
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226 if source is None:
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227 if source_path:
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228 # Specify encoding in Python 3
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229 if sys.version_info >= (3,0):
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230 kwargs = {'encoding': self.encoding,
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231 'errors': self.error_handler}
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232 else:
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233 kwargs = {}
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234
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235 try:
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236 self.source = open(source_path, mode, **kwargs)
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237 except IOError, error:
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238 raise InputError(error.errno, error.strerror, source_path)
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239 else:
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240 self.source = sys.stdin
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241 elif (sys.version_info >= (3,0) and
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242 check_encoding(self.source, self.encoding) is False):
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243 # TODO: re-open, warn or raise error?
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244 raise UnicodeError('Encoding clash: encoding given is "%s" '
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245 'but source is opened with encoding "%s".' %
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246 (self.encoding, self.source.encoding))
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247 if not source_path:
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248 try:
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249 self.source_path = self.source.name
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250 except AttributeError:
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251 pass
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252
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253 def read(self):
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254 """
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255 Read and decode a single file and return the data (Unicode string).
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256 """
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257 try: # In Python < 2.5, try...except has to be nested in try...finally.
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258 try:
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259 if self.source is sys.stdin and sys.version_info >= (3,0):
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260 # read as binary data to circumvent auto-decoding
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261 data = self.source.buffer.read()
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262 # normalize newlines
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263 data = b('\n').join(data.splitlines()) + b('\n')
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264 else:
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265 data = self.source.read()
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266 except (UnicodeError, LookupError), err: # (in Py3k read() decodes)
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267 if not self.encoding and self.source_path:
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268 # re-read in binary mode and decode with heuristics
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269 b_source = open(self.source_path, 'rb')
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270 data = b_source.read()
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271 b_source.close()
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272 # normalize newlines
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273 data = b('\n').join(data.splitlines()) + b('\n')
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274 else:
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275 raise
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276 finally:
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277 if self.autoclose:
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278 self.close()
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279 return self.decode(data)
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280
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281 def readlines(self):
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282 """
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283 Return lines of a single file as list of Unicode strings.
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284 """
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285 return self.read().splitlines(True)
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286
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287 def close(self):
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288 if self.source is not sys.stdin:
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289 self.source.close()
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290
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291
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292 class FileOutput(Output):
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293
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294 """
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295 Output for single, simple file-like objects.
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296 """
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297
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298 mode = 'w'
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299 """The mode argument for `open()`."""
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300 # 'wb' for binary (e.g. OpenOffice) files (see also `BinaryFileOutput`).
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301 # (Do not use binary mode ('wb') for text files, as this prevents the
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302 # conversion of newlines to the system specific default.)
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303
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304 def __init__(self, destination=None, destination_path=None,
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305 encoding=None, error_handler='strict', autoclose=True,
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306 handle_io_errors=None, mode=None):
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307 """
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308 :Parameters:
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309 - `destination`: either a file-like object (which is written
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310 directly) or `None` (which implies `sys.stdout` if no
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311 `destination_path` given).
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312 - `destination_path`: a path to a file, which is opened and then
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313 written.
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314 - `encoding`: the text encoding of the output file.
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315 - `error_handler`: the encoding error handler to use.
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316 - `autoclose`: close automatically after write (except when
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317 `sys.stdout` or `sys.stderr` is the destination).
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318 - `handle_io_errors`: ignored, deprecated, will be removed.
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319 - `mode`: how the file is to be opened (see standard function
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320 `open`). The default is 'w', providing universal newline
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321 support for text files.
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322 """
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323 Output.__init__(self, destination, destination_path,
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324 encoding, error_handler)
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325 self.opened = True
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326 self.autoclose = autoclose
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327 if mode is not None:
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328 self.mode = mode
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329 self._stderr = ErrorOutput()
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330 if destination is None:
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331 if destination_path:
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332 self.opened = False
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333 else:
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334 self.destination = sys.stdout
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335 elif (# destination is file-type object -> check mode:
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336 mode and hasattr(self.destination, 'mode')
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337 and mode != self.destination.mode):
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338 print >>self._stderr, ('Warning: Destination mode "%s" '
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339 'differs from specified mode "%s"' %
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340 (self.destination.mode, mode))
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341 if not destination_path:
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342 try:
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343 self.destination_path = self.destination.name
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344 except AttributeError:
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345 pass
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346
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347 def open(self):
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348 # Specify encoding in Python 3.
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349 if sys.version_info >= (3,0) and 'b' not in self.mode:
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350 kwargs = {'encoding': self.encoding,
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351 'errors': self.error_handler}
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352 else:
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353 kwargs = {}
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354 try:
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355 self.destination = open(self.destination_path, self.mode, **kwargs)
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356 except IOError, error:
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357 raise OutputError(error.errno, error.strerror,
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358 self.destination_path)
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359 self.opened = True
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360
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361 def write(self, data):
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362 """Encode `data`, write it to a single file, and return it.
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363
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364 With Python 3 or binary output mode, `data` is returned unchanged,
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365 except when specified encoding and output encoding differ.
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366 """
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367 if not self.opened:
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368 self.open()
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369 if ('b' not in self.mode and sys.version_info < (3,0)
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370 or check_encoding(self.destination, self.encoding) is False
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371 ):
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372 if sys.version_info >= (3,0) and os.linesep != '\n':
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373 data = data.replace('\n', os.linesep) # fix endings
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374 data = self.encode(data)
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375
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376 try: # In Python < 2.5, try...except has to be nested in try...finally.
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377 try:
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378 self.destination.write(data)
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379 except TypeError, e:
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380 if sys.version_info >= (3,0) and isinstance(data, bytes):
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381 try:
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382 self.destination.buffer.write(data)
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383 except AttributeError:
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384 if check_encoding(self.destination,
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385 self.encoding) is False:
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386 raise ValueError('Encoding of %s (%s) differs \n'
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387 ' from specified encoding (%s)' %
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388 (self.destination_path or 'destination',
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389 self.destination.encoding, self.encoding))
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390 else:
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391 raise e
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392 except (UnicodeError, LookupError), err:
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393 raise UnicodeError(
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394 'Unable to encode output data. output-encoding is: '
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395 '%s.\n(%s)' % (self.encoding, ErrorString(err)))
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396 finally:
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397 if self.autoclose:
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398 self.close()
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399 return data
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400
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401 def close(self):
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402 if self.destination not in (sys.stdout, sys.stderr):
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403 self.destination.close()
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404 self.opened = False
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405
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406
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407 class BinaryFileOutput(FileOutput):
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408 """
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409 A version of docutils.io.FileOutput which writes to a binary file.
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410 """
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411 # Used by core.publish_cmdline_to_binary() which in turn is used by
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412 # rst2odt (OpenOffice writer)
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413 mode = 'wb'
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414
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415
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416 class StringInput(Input):
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417
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418 """
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419 Direct string input.
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420 """
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421
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422 default_source_path = '<string>'
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423
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424 def read(self):
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425 """Decode and return the source string."""
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426 return self.decode(self.source)
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427
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428
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429 class StringOutput(Output):
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430
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431 """
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432 Direct string output.
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433 """
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434
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435 default_destination_path = '<string>'
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436
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437 def write(self, data):
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438 """Encode `data`, store it in `self.destination`, and return it."""
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439 self.destination = self.encode(data)
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440 return self.destination
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441
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442
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443 class NullInput(Input):
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444
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445 """
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446 Degenerate input: read nothing.
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447 """
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448
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449 default_source_path = 'null input'
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450
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451 def read(self):
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452 """Return a null string."""
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453 return u''
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454
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455
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456 class NullOutput(Output):
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457
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458 """
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459 Degenerate output: write nothing.
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460 """
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461
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462 default_destination_path = 'null output'
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463
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464 def write(self, data):
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465 """Do nothing ([don't even] send data to the bit bucket)."""
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466 pass
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467
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468
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469 class DocTreeInput(Input):
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470
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471 """
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472 Adapter for document tree input.
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473
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474 The document tree must be passed in the ``source`` parameter.
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475 """
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476
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477 default_source_path = 'doctree input'
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478
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479 def read(self):
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480 """Return the document tree."""
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481 return self.source