Mercurial > repos > shellac > sam_consensus_v3
annotate env/lib/python3.9/site-packages/bleach/_vendor/html5lib/_inputstream.py @ 0:4f3585e2f14b draft default tip
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
author | shellac |
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date | Mon, 22 Mar 2021 18:12:50 +0000 |
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1 from __future__ import absolute_import, division, unicode_literals |
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2 |
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3 from six import text_type |
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4 from six.moves import http_client, urllib |
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5 |
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6 import codecs |
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7 import re |
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8 from io import BytesIO, StringIO |
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9 |
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10 import webencodings |
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11 |
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12 from .constants import EOF, spaceCharacters, asciiLetters, asciiUppercase |
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13 from .constants import _ReparseException |
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14 from . import _utils |
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15 |
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16 # Non-unicode versions of constants for use in the pre-parser |
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17 spaceCharactersBytes = frozenset([item.encode("ascii") for item in spaceCharacters]) |
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18 asciiLettersBytes = frozenset([item.encode("ascii") for item in asciiLetters]) |
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19 asciiUppercaseBytes = frozenset([item.encode("ascii") for item in asciiUppercase]) |
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20 spacesAngleBrackets = spaceCharactersBytes | frozenset([b">", b"<"]) |
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21 |
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22 |
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23 invalid_unicode_no_surrogate = "[\u0001-\u0008\u000B\u000E-\u001F\u007F-\u009F\uFDD0-\uFDEF\uFFFE\uFFFF\U0001FFFE\U0001FFFF\U0002FFFE\U0002FFFF\U0003FFFE\U0003FFFF\U0004FFFE\U0004FFFF\U0005FFFE\U0005FFFF\U0006FFFE\U0006FFFF\U0007FFFE\U0007FFFF\U0008FFFE\U0008FFFF\U0009FFFE\U0009FFFF\U000AFFFE\U000AFFFF\U000BFFFE\U000BFFFF\U000CFFFE\U000CFFFF\U000DFFFE\U000DFFFF\U000EFFFE\U000EFFFF\U000FFFFE\U000FFFFF\U0010FFFE\U0010FFFF]" # noqa |
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24 |
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25 if _utils.supports_lone_surrogates: |
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26 # Use one extra step of indirection and create surrogates with |
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27 # eval. Not using this indirection would introduce an illegal |
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28 # unicode literal on platforms not supporting such lone |
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29 # surrogates. |
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30 assert invalid_unicode_no_surrogate[-1] == "]" and invalid_unicode_no_surrogate.count("]") == 1 |
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31 invalid_unicode_re = re.compile(invalid_unicode_no_surrogate[:-1] + |
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32 eval('"\\uD800-\\uDFFF"') + # pylint:disable=eval-used |
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33 "]") |
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34 else: |
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35 invalid_unicode_re = re.compile(invalid_unicode_no_surrogate) |
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36 |
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37 non_bmp_invalid_codepoints = {0x1FFFE, 0x1FFFF, 0x2FFFE, 0x2FFFF, 0x3FFFE, |
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38 0x3FFFF, 0x4FFFE, 0x4FFFF, 0x5FFFE, 0x5FFFF, |
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39 0x6FFFE, 0x6FFFF, 0x7FFFE, 0x7FFFF, 0x8FFFE, |
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40 0x8FFFF, 0x9FFFE, 0x9FFFF, 0xAFFFE, 0xAFFFF, |
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41 0xBFFFE, 0xBFFFF, 0xCFFFE, 0xCFFFF, 0xDFFFE, |
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42 0xDFFFF, 0xEFFFE, 0xEFFFF, 0xFFFFE, 0xFFFFF, |
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43 0x10FFFE, 0x10FFFF} |
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44 |
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45 ascii_punctuation_re = re.compile("[\u0009-\u000D\u0020-\u002F\u003A-\u0040\u005C\u005B-\u0060\u007B-\u007E]") |
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46 |
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47 # Cache for charsUntil() |
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48 charsUntilRegEx = {} |
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49 |
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50 |
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51 class BufferedStream(object): |
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52 """Buffering for streams that do not have buffering of their own |
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53 |
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54 The buffer is implemented as a list of chunks on the assumption that |
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55 joining many strings will be slow since it is O(n**2) |
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56 """ |
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57 |
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58 def __init__(self, stream): |
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59 self.stream = stream |
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60 self.buffer = [] |
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61 self.position = [-1, 0] # chunk number, offset |
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62 |
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63 def tell(self): |
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64 pos = 0 |
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65 for chunk in self.buffer[:self.position[0]]: |
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66 pos += len(chunk) |
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67 pos += self.position[1] |
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68 return pos |
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69 |
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70 def seek(self, pos): |
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71 assert pos <= self._bufferedBytes() |
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72 offset = pos |
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73 i = 0 |
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74 while len(self.buffer[i]) < offset: |
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75 offset -= len(self.buffer[i]) |
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76 i += 1 |
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77 self.position = [i, offset] |
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78 |
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79 def read(self, bytes): |
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80 if not self.buffer: |
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81 return self._readStream(bytes) |
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82 elif (self.position[0] == len(self.buffer) and |
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83 self.position[1] == len(self.buffer[-1])): |
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84 return self._readStream(bytes) |
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85 else: |
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86 return self._readFromBuffer(bytes) |
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87 |
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88 def _bufferedBytes(self): |
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89 return sum([len(item) for item in self.buffer]) |
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90 |
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91 def _readStream(self, bytes): |
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92 data = self.stream.read(bytes) |
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93 self.buffer.append(data) |
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94 self.position[0] += 1 |
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95 self.position[1] = len(data) |
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96 return data |
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97 |
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98 def _readFromBuffer(self, bytes): |
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99 remainingBytes = bytes |
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100 rv = [] |
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101 bufferIndex = self.position[0] |
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102 bufferOffset = self.position[1] |
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103 while bufferIndex < len(self.buffer) and remainingBytes != 0: |
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104 assert remainingBytes > 0 |
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105 bufferedData = self.buffer[bufferIndex] |
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106 |
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107 if remainingBytes <= len(bufferedData) - bufferOffset: |
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108 bytesToRead = remainingBytes |
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109 self.position = [bufferIndex, bufferOffset + bytesToRead] |
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110 else: |
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111 bytesToRead = len(bufferedData) - bufferOffset |
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112 self.position = [bufferIndex, len(bufferedData)] |
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113 bufferIndex += 1 |
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114 rv.append(bufferedData[bufferOffset:bufferOffset + bytesToRead]) |
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115 remainingBytes -= bytesToRead |
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116 |
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117 bufferOffset = 0 |
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118 |
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119 if remainingBytes: |
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120 rv.append(self._readStream(remainingBytes)) |
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121 |
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122 return b"".join(rv) |
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123 |
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124 |
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125 def HTMLInputStream(source, **kwargs): |
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126 # Work around Python bug #20007: read(0) closes the connection. |
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127 # http://bugs.python.org/issue20007 |
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128 if (isinstance(source, http_client.HTTPResponse) or |
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129 # Also check for addinfourl wrapping HTTPResponse |
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130 (isinstance(source, urllib.response.addbase) and |
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131 isinstance(source.fp, http_client.HTTPResponse))): |
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132 isUnicode = False |
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133 elif hasattr(source, "read"): |
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134 isUnicode = isinstance(source.read(0), text_type) |
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135 else: |
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136 isUnicode = isinstance(source, text_type) |
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137 |
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138 if isUnicode: |
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139 encodings = [x for x in kwargs if x.endswith("_encoding")] |
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140 if encodings: |
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141 raise TypeError("Cannot set an encoding with a unicode input, set %r" % encodings) |
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142 |
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143 return HTMLUnicodeInputStream(source, **kwargs) |
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144 else: |
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145 return HTMLBinaryInputStream(source, **kwargs) |
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146 |
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147 |
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148 class HTMLUnicodeInputStream(object): |
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149 """Provides a unicode stream of characters to the HTMLTokenizer. |
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150 |
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151 This class takes care of character encoding and removing or replacing |
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152 incorrect byte-sequences and also provides column and line tracking. |
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153 |
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154 """ |
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155 |
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156 _defaultChunkSize = 10240 |
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157 |
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158 def __init__(self, source): |
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159 """Initialises the HTMLInputStream. |
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160 |
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161 HTMLInputStream(source, [encoding]) -> Normalized stream from source |
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162 for use by html5lib. |
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163 |
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164 source can be either a file-object, local filename or a string. |
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165 |
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166 The optional encoding parameter must be a string that indicates |
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167 the encoding. If specified, that encoding will be used, |
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168 regardless of any BOM or later declaration (such as in a meta |
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169 element) |
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170 |
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171 """ |
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172 |
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173 if not _utils.supports_lone_surrogates: |
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174 # Such platforms will have already checked for such |
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175 # surrogate errors, so no need to do this checking. |
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176 self.reportCharacterErrors = None |
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177 elif len("\U0010FFFF") == 1: |
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178 self.reportCharacterErrors = self.characterErrorsUCS4 |
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179 else: |
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180 self.reportCharacterErrors = self.characterErrorsUCS2 |
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181 |
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182 # List of where new lines occur |
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183 self.newLines = [0] |
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184 |
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185 self.charEncoding = (lookupEncoding("utf-8"), "certain") |
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186 self.dataStream = self.openStream(source) |
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187 |
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188 self.reset() |
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189 |
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190 def reset(self): |
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191 self.chunk = "" |
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192 self.chunkSize = 0 |
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193 self.chunkOffset = 0 |
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194 self.errors = [] |
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195 |
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196 # number of (complete) lines in previous chunks |
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197 self.prevNumLines = 0 |
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198 # number of columns in the last line of the previous chunk |
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199 self.prevNumCols = 0 |
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200 |
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201 # Deal with CR LF and surrogates split over chunk boundaries |
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202 self._bufferedCharacter = None |
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203 |
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204 def openStream(self, source): |
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205 """Produces a file object from source. |
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206 |
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207 source can be either a file object, local filename or a string. |
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208 |
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209 """ |
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210 # Already a file object |
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211 if hasattr(source, 'read'): |
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212 stream = source |
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213 else: |
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214 stream = StringIO(source) |
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215 |
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216 return stream |
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217 |
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218 def _position(self, offset): |
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219 chunk = self.chunk |
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220 nLines = chunk.count('\n', 0, offset) |
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221 positionLine = self.prevNumLines + nLines |
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222 lastLinePos = chunk.rfind('\n', 0, offset) |
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223 if lastLinePos == -1: |
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224 positionColumn = self.prevNumCols + offset |
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225 else: |
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226 positionColumn = offset - (lastLinePos + 1) |
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227 return (positionLine, positionColumn) |
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228 |
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229 def position(self): |
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230 """Returns (line, col) of the current position in the stream.""" |
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231 line, col = self._position(self.chunkOffset) |
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232 return (line + 1, col) |
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233 |
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234 def char(self): |
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235 """ Read one character from the stream or queue if available. Return |
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236 EOF when EOF is reached. |
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237 """ |
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238 # Read a new chunk from the input stream if necessary |
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239 if self.chunkOffset >= self.chunkSize: |
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240 if not self.readChunk(): |
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241 return EOF |
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242 |
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243 chunkOffset = self.chunkOffset |
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244 char = self.chunk[chunkOffset] |
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245 self.chunkOffset = chunkOffset + 1 |
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246 |
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247 return char |
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248 |
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249 def readChunk(self, chunkSize=None): |
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250 if chunkSize is None: |
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251 chunkSize = self._defaultChunkSize |
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252 |
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253 self.prevNumLines, self.prevNumCols = self._position(self.chunkSize) |
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254 |
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255 self.chunk = "" |
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256 self.chunkSize = 0 |
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257 self.chunkOffset = 0 |
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258 |
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259 data = self.dataStream.read(chunkSize) |
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260 |
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261 # Deal with CR LF and surrogates broken across chunks |
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262 if self._bufferedCharacter: |
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263 data = self._bufferedCharacter + data |
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264 self._bufferedCharacter = None |
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265 elif not data: |
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266 # We have no more data, bye-bye stream |
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267 return False |
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268 |
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269 if len(data) > 1: |
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270 lastv = ord(data[-1]) |
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271 if lastv == 0x0D or 0xD800 <= lastv <= 0xDBFF: |
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272 self._bufferedCharacter = data[-1] |
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273 data = data[:-1] |
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274 |
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275 if self.reportCharacterErrors: |
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276 self.reportCharacterErrors(data) |
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277 |
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278 # Replace invalid characters |
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279 data = data.replace("\r\n", "\n") |
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280 data = data.replace("\r", "\n") |
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281 |
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282 self.chunk = data |
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283 self.chunkSize = len(data) |
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284 |
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285 return True |
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286 |
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287 def characterErrorsUCS4(self, data): |
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288 for _ in range(len(invalid_unicode_re.findall(data))): |
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289 self.errors.append("invalid-codepoint") |
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290 |
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291 def characterErrorsUCS2(self, data): |
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292 # Someone picked the wrong compile option |
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293 # You lose |
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294 skip = False |
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295 for match in invalid_unicode_re.finditer(data): |
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296 if skip: |
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297 continue |
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298 codepoint = ord(match.group()) |
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299 pos = match.start() |
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300 # Pretty sure there should be endianness issues here |
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301 if _utils.isSurrogatePair(data[pos:pos + 2]): |
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302 # We have a surrogate pair! |
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303 char_val = _utils.surrogatePairToCodepoint(data[pos:pos + 2]) |
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304 if char_val in non_bmp_invalid_codepoints: |
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305 self.errors.append("invalid-codepoint") |
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306 skip = True |
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307 elif (codepoint >= 0xD800 and codepoint <= 0xDFFF and |
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308 pos == len(data) - 1): |
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309 self.errors.append("invalid-codepoint") |
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310 else: |
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311 skip = False |
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312 self.errors.append("invalid-codepoint") |
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313 |
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314 def charsUntil(self, characters, opposite=False): |
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315 """ Returns a string of characters from the stream up to but not |
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316 including any character in 'characters' or EOF. 'characters' must be |
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317 a container that supports the 'in' method and iteration over its |
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318 characters. |
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319 """ |
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320 |
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321 # Use a cache of regexps to find the required characters |
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322 try: |
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323 chars = charsUntilRegEx[(characters, opposite)] |
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324 except KeyError: |
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325 if __debug__: |
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326 for c in characters: |
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327 assert(ord(c) < 128) |
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328 regex = "".join(["\\x%02x" % ord(c) for c in characters]) |
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329 if not opposite: |
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330 regex = "^%s" % regex |
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331 chars = charsUntilRegEx[(characters, opposite)] = re.compile("[%s]+" % regex) |
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332 |
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333 rv = [] |
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334 |
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335 while True: |
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336 # Find the longest matching prefix |
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337 m = chars.match(self.chunk, self.chunkOffset) |
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338 if m is None: |
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339 # If nothing matched, and it wasn't because we ran out of chunk, |
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340 # then stop |
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341 if self.chunkOffset != self.chunkSize: |
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342 break |
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343 else: |
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344 end = m.end() |
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345 # If not the whole chunk matched, return everything |
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346 # up to the part that didn't match |
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347 if end != self.chunkSize: |
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348 rv.append(self.chunk[self.chunkOffset:end]) |
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349 self.chunkOffset = end |
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350 break |
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351 # If the whole remainder of the chunk matched, |
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352 # use it all and read the next chunk |
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353 rv.append(self.chunk[self.chunkOffset:]) |
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354 if not self.readChunk(): |
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355 # Reached EOF |
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356 break |
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357 |
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358 r = "".join(rv) |
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359 return r |
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360 |
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361 def unget(self, char): |
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362 # Only one character is allowed to be ungotten at once - it must |
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363 # be consumed again before any further call to unget |
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364 if char is not EOF: |
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365 if self.chunkOffset == 0: |
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366 # unget is called quite rarely, so it's a good idea to do |
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367 # more work here if it saves a bit of work in the frequently |
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368 # called char and charsUntil. |
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369 # So, just prepend the ungotten character onto the current |
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370 # chunk: |
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371 self.chunk = char + self.chunk |
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372 self.chunkSize += 1 |
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373 else: |
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374 self.chunkOffset -= 1 |
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375 assert self.chunk[self.chunkOffset] == char |
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376 |
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377 |
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378 class HTMLBinaryInputStream(HTMLUnicodeInputStream): |
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379 """Provides a unicode stream of characters to the HTMLTokenizer. |
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380 |
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381 This class takes care of character encoding and removing or replacing |
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382 incorrect byte-sequences and also provides column and line tracking. |
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383 |
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384 """ |
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385 |
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386 def __init__(self, source, override_encoding=None, transport_encoding=None, |
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387 same_origin_parent_encoding=None, likely_encoding=None, |
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388 default_encoding="windows-1252", useChardet=True): |
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389 """Initialises the HTMLInputStream. |
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390 |
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391 HTMLInputStream(source, [encoding]) -> Normalized stream from source |
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392 for use by html5lib. |
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393 |
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394 source can be either a file-object, local filename or a string. |
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395 |
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396 The optional encoding parameter must be a string that indicates |
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397 the encoding. If specified, that encoding will be used, |
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398 regardless of any BOM or later declaration (such as in a meta |
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399 element) |
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400 |
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401 """ |
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402 # Raw Stream - for unicode objects this will encode to utf-8 and set |
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403 # self.charEncoding as appropriate |
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404 self.rawStream = self.openStream(source) |
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405 |
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406 HTMLUnicodeInputStream.__init__(self, self.rawStream) |
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407 |
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408 # Encoding Information |
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409 # Number of bytes to use when looking for a meta element with |
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410 # encoding information |
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411 self.numBytesMeta = 1024 |
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412 # Number of bytes to use when using detecting encoding using chardet |
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413 self.numBytesChardet = 100 |
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414 # Things from args |
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415 self.override_encoding = override_encoding |
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416 self.transport_encoding = transport_encoding |
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417 self.same_origin_parent_encoding = same_origin_parent_encoding |
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418 self.likely_encoding = likely_encoding |
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419 self.default_encoding = default_encoding |
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420 |
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421 # Determine encoding |
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422 self.charEncoding = self.determineEncoding(useChardet) |
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423 assert self.charEncoding[0] is not None |
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424 |
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425 # Call superclass |
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426 self.reset() |
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427 |
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428 def reset(self): |
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429 self.dataStream = self.charEncoding[0].codec_info.streamreader(self.rawStream, 'replace') |
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430 HTMLUnicodeInputStream.reset(self) |
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431 |
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432 def openStream(self, source): |
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433 """Produces a file object from source. |
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434 |
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435 source can be either a file object, local filename or a string. |
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436 |
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437 """ |
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438 # Already a file object |
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439 if hasattr(source, 'read'): |
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440 stream = source |
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441 else: |
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442 stream = BytesIO(source) |
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443 |
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444 try: |
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445 stream.seek(stream.tell()) |
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446 except Exception: |
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447 stream = BufferedStream(stream) |
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448 |
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449 return stream |
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450 |
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451 def determineEncoding(self, chardet=True): |
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452 # BOMs take precedence over everything |
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453 # This will also read past the BOM if present |
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454 charEncoding = self.detectBOM(), "certain" |
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455 if charEncoding[0] is not None: |
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456 return charEncoding |
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457 |
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458 # If we've been overridden, we've been overridden |
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459 charEncoding = lookupEncoding(self.override_encoding), "certain" |
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460 if charEncoding[0] is not None: |
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461 return charEncoding |
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462 |
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463 # Now check the transport layer |
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464 charEncoding = lookupEncoding(self.transport_encoding), "certain" |
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465 if charEncoding[0] is not None: |
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466 return charEncoding |
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467 |
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468 # Look for meta elements with encoding information |
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469 charEncoding = self.detectEncodingMeta(), "tentative" |
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470 if charEncoding[0] is not None: |
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471 return charEncoding |
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472 |
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473 # Parent document encoding |
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474 charEncoding = lookupEncoding(self.same_origin_parent_encoding), "tentative" |
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475 if charEncoding[0] is not None and not charEncoding[0].name.startswith("utf-16"): |
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476 return charEncoding |
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477 |
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478 # "likely" encoding |
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479 charEncoding = lookupEncoding(self.likely_encoding), "tentative" |
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480 if charEncoding[0] is not None: |
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481 return charEncoding |
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482 |
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483 # Guess with chardet, if available |
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484 if chardet: |
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485 try: |
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486 from chardet.universaldetector import UniversalDetector |
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487 except ImportError: |
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488 pass |
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489 else: |
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490 buffers = [] |
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491 detector = UniversalDetector() |
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492 while not detector.done: |
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493 buffer = self.rawStream.read(self.numBytesChardet) |
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494 assert isinstance(buffer, bytes) |
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495 if not buffer: |
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496 break |
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497 buffers.append(buffer) |
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498 detector.feed(buffer) |
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499 detector.close() |
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500 encoding = lookupEncoding(detector.result['encoding']) |
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501 self.rawStream.seek(0) |
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502 if encoding is not None: |
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503 return encoding, "tentative" |
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504 |
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505 # Try the default encoding |
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506 charEncoding = lookupEncoding(self.default_encoding), "tentative" |
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507 if charEncoding[0] is not None: |
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508 return charEncoding |
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509 |
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510 # Fallback to html5lib's default if even that hasn't worked |
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511 return lookupEncoding("windows-1252"), "tentative" |
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512 |
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513 def changeEncoding(self, newEncoding): |
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514 assert self.charEncoding[1] != "certain" |
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515 newEncoding = lookupEncoding(newEncoding) |
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516 if newEncoding is None: |
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517 return |
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518 if newEncoding.name in ("utf-16be", "utf-16le"): |
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519 newEncoding = lookupEncoding("utf-8") |
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520 assert newEncoding is not None |
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521 elif newEncoding == self.charEncoding[0]: |
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522 self.charEncoding = (self.charEncoding[0], "certain") |
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523 else: |
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524 self.rawStream.seek(0) |
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525 self.charEncoding = (newEncoding, "certain") |
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526 self.reset() |
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527 raise _ReparseException("Encoding changed from %s to %s" % (self.charEncoding[0], newEncoding)) |
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528 |
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529 def detectBOM(self): |
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530 """Attempts to detect at BOM at the start of the stream. If |
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531 an encoding can be determined from the BOM return the name of the |
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532 encoding otherwise return None""" |
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533 bomDict = { |
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534 codecs.BOM_UTF8: 'utf-8', |
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535 codecs.BOM_UTF16_LE: 'utf-16le', codecs.BOM_UTF16_BE: 'utf-16be', |
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536 codecs.BOM_UTF32_LE: 'utf-32le', codecs.BOM_UTF32_BE: 'utf-32be' |
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537 } |
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538 |
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539 # Go to beginning of file and read in 4 bytes |
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540 string = self.rawStream.read(4) |
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541 assert isinstance(string, bytes) |
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542 |
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543 # Try detecting the BOM using bytes from the string |
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544 encoding = bomDict.get(string[:3]) # UTF-8 |
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545 seek = 3 |
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546 if not encoding: |
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547 # Need to detect UTF-32 before UTF-16 |
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548 encoding = bomDict.get(string) # UTF-32 |
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549 seek = 4 |
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550 if not encoding: |
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551 encoding = bomDict.get(string[:2]) # UTF-16 |
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552 seek = 2 |
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553 |
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554 # Set the read position past the BOM if one was found, otherwise |
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555 # set it to the start of the stream |
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556 if encoding: |
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557 self.rawStream.seek(seek) |
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558 return lookupEncoding(encoding) |
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559 else: |
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560 self.rawStream.seek(0) |
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561 return None |
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562 |
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563 def detectEncodingMeta(self): |
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564 """Report the encoding declared by the meta element |
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565 """ |
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566 buffer = self.rawStream.read(self.numBytesMeta) |
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567 assert isinstance(buffer, bytes) |
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568 parser = EncodingParser(buffer) |
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569 self.rawStream.seek(0) |
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570 encoding = parser.getEncoding() |
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571 |
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572 if encoding is not None and encoding.name in ("utf-16be", "utf-16le"): |
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573 encoding = lookupEncoding("utf-8") |
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574 |
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575 return encoding |
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576 |
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577 |
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578 class EncodingBytes(bytes): |
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579 """String-like object with an associated position and various extra methods |
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580 If the position is ever greater than the string length then an exception is |
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581 raised""" |
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582 def __new__(self, value): |
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583 assert isinstance(value, bytes) |
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584 return bytes.__new__(self, value.lower()) |
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585 |
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586 def __init__(self, value): |
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587 # pylint:disable=unused-argument |
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588 self._position = -1 |
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589 |
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590 def __iter__(self): |
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591 return self |
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592 |
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593 def __next__(self): |
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594 p = self._position = self._position + 1 |
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595 if p >= len(self): |
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596 raise StopIteration |
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597 elif p < 0: |
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598 raise TypeError |
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599 return self[p:p + 1] |
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600 |
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601 def next(self): |
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602 # Py2 compat |
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603 return self.__next__() |
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604 |
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605 def previous(self): |
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606 p = self._position |
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607 if p >= len(self): |
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608 raise StopIteration |
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609 elif p < 0: |
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610 raise TypeError |
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611 self._position = p = p - 1 |
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612 return self[p:p + 1] |
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613 |
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614 def setPosition(self, position): |
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615 if self._position >= len(self): |
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616 raise StopIteration |
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617 self._position = position |
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618 |
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619 def getPosition(self): |
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620 if self._position >= len(self): |
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621 raise StopIteration |
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622 if self._position >= 0: |
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623 return self._position |
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624 else: |
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625 return None |
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626 |
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627 position = property(getPosition, setPosition) |
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628 |
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629 def getCurrentByte(self): |
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630 return self[self.position:self.position + 1] |
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631 |
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632 currentByte = property(getCurrentByte) |
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633 |
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634 def skip(self, chars=spaceCharactersBytes): |
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635 """Skip past a list of characters""" |
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636 p = self.position # use property for the error-checking |
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637 while p < len(self): |
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638 c = self[p:p + 1] |
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639 if c not in chars: |
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640 self._position = p |
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641 return c |
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642 p += 1 |
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643 self._position = p |
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644 return None |
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645 |
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646 def skipUntil(self, chars): |
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647 p = self.position |
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648 while p < len(self): |
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649 c = self[p:p + 1] |
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650 if c in chars: |
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651 self._position = p |
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652 return c |
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653 p += 1 |
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654 self._position = p |
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655 return None |
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656 |
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657 def matchBytes(self, bytes): |
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658 """Look for a sequence of bytes at the start of a string. If the bytes |
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659 are found return True and advance the position to the byte after the |
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660 match. Otherwise return False and leave the position alone""" |
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661 rv = self.startswith(bytes, self.position) |
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662 if rv: |
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663 self.position += len(bytes) |
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664 return rv |
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665 |
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666 def jumpTo(self, bytes): |
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667 """Look for the next sequence of bytes matching a given sequence. If |
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668 a match is found advance the position to the last byte of the match""" |
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669 try: |
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670 self._position = self.index(bytes, self.position) + len(bytes) - 1 |
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671 except ValueError: |
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672 raise StopIteration |
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673 return True |
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674 |
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675 |
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676 class EncodingParser(object): |
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677 """Mini parser for detecting character encoding from meta elements""" |
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678 |
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679 def __init__(self, data): |
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680 """string - the data to work on for encoding detection""" |
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parents:
diff
changeset
|
681 self.data = EncodingBytes(data) |
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parents:
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changeset
|
682 self.encoding = None |
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parents:
diff
changeset
|
683 |
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parents:
diff
changeset
|
684 def getEncoding(self): |
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parents:
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changeset
|
685 if b"<meta" not in self.data: |
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parents:
diff
changeset
|
686 return None |
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parents:
diff
changeset
|
687 |
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shellac
parents:
diff
changeset
|
688 methodDispatch = ( |
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shellac
parents:
diff
changeset
|
689 (b"<!--", self.handleComment), |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
690 (b"<meta", self.handleMeta), |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
691 (b"</", self.handlePossibleEndTag), |
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shellac
parents:
diff
changeset
|
692 (b"<!", self.handleOther), |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
693 (b"<?", self.handleOther), |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
694 (b"<", self.handlePossibleStartTag)) |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
695 for _ in self.data: |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
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parents:
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changeset
|
696 keepParsing = True |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
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parents:
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changeset
|
697 try: |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
698 self.data.jumpTo(b"<") |
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shellac
parents:
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changeset
|
699 except StopIteration: |
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parents:
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changeset
|
700 break |
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parents:
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changeset
|
701 for key, method in methodDispatch: |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
702 if self.data.matchBytes(key): |
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shellac
parents:
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changeset
|
703 try: |
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shellac
parents:
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changeset
|
704 keepParsing = method() |
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parents:
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changeset
|
705 break |
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parents:
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changeset
|
706 except StopIteration: |
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shellac
parents:
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changeset
|
707 keepParsing = False |
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parents:
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|
708 break |
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parents:
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changeset
|
709 if not keepParsing: |
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shellac
parents:
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changeset
|
710 break |
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parents:
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changeset
|
711 |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
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parents:
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changeset
|
712 return self.encoding |
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shellac
parents:
diff
changeset
|
713 |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
714 def handleComment(self): |
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shellac
parents:
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changeset
|
715 """Skip over comments""" |
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shellac
parents:
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changeset
|
716 return self.data.jumpTo(b"-->") |
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shellac
parents:
diff
changeset
|
717 |
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shellac
parents:
diff
changeset
|
718 def handleMeta(self): |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
719 if self.data.currentByte not in spaceCharactersBytes: |
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shellac
parents:
diff
changeset
|
720 # if we have <meta not followed by a space so just keep going |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
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changeset
|
721 return True |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
722 # We have a valid meta element we want to search for attributes |
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shellac
parents:
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|
723 hasPragma = False |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
724 pendingEncoding = None |
4f3585e2f14b
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shellac
parents:
diff
changeset
|
725 while True: |
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shellac
parents:
diff
changeset
|
726 # Try to find the next attribute after the current position |
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shellac
parents:
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changeset
|
727 attr = self.getAttribute() |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
728 if attr is None: |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
729 return True |
4f3585e2f14b
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shellac
parents:
diff
changeset
|
730 else: |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
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changeset
|
731 if attr[0] == b"http-equiv": |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
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changeset
|
732 hasPragma = attr[1] == b"content-type" |
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shellac
parents:
diff
changeset
|
733 if hasPragma and pendingEncoding is not None: |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
734 self.encoding = pendingEncoding |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
735 return False |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
736 elif attr[0] == b"charset": |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
737 tentativeEncoding = attr[1] |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
738 codec = lookupEncoding(tentativeEncoding) |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
739 if codec is not None: |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
740 self.encoding = codec |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
741 return False |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
742 elif attr[0] == b"content": |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
743 contentParser = ContentAttrParser(EncodingBytes(attr[1])) |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
744 tentativeEncoding = contentParser.parse() |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
745 if tentativeEncoding is not None: |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
746 codec = lookupEncoding(tentativeEncoding) |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
747 if codec is not None: |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
748 if hasPragma: |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
749 self.encoding = codec |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
750 return False |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
751 else: |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
752 pendingEncoding = codec |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
753 |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
754 def handlePossibleStartTag(self): |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
755 return self.handlePossibleTag(False) |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
756 |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
757 def handlePossibleEndTag(self): |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
758 next(self.data) |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
759 return self.handlePossibleTag(True) |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
760 |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
761 def handlePossibleTag(self, endTag): |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
762 data = self.data |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
763 if data.currentByte not in asciiLettersBytes: |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
764 # If the next byte is not an ascii letter either ignore this |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
765 # fragment (possible start tag case) or treat it according to |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
766 # handleOther |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
767 if endTag: |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
768 data.previous() |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
769 self.handleOther() |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
770 return True |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
771 |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
772 c = data.skipUntil(spacesAngleBrackets) |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
773 if c == b"<": |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
774 # return to the first step in the overall "two step" algorithm |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
775 # reprocessing the < byte |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
776 data.previous() |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
777 else: |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
778 # Read all attributes |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
779 attr = self.getAttribute() |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
780 while attr is not None: |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
781 attr = self.getAttribute() |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
782 return True |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
783 |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
784 def handleOther(self): |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
785 return self.data.jumpTo(b">") |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
786 |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
787 def getAttribute(self): |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
788 """Return a name,value pair for the next attribute in the stream, |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
789 if one is found, or None""" |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
790 data = self.data |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
791 # Step 1 (skip chars) |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
792 c = data.skip(spaceCharactersBytes | frozenset([b"/"])) |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
793 assert c is None or len(c) == 1 |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
794 # Step 2 |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
795 if c in (b">", None): |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
796 return None |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
797 # Step 3 |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
798 attrName = [] |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
799 attrValue = [] |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
800 # Step 4 attribute name |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
801 while True: |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
802 if c == b"=" and attrName: |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
803 break |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
804 elif c in spaceCharactersBytes: |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
805 # Step 6! |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
806 c = data.skip() |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
807 break |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
808 elif c in (b"/", b">"): |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
809 return b"".join(attrName), b"" |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
810 elif c in asciiUppercaseBytes: |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
811 attrName.append(c.lower()) |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
812 elif c is None: |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
813 return None |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
814 else: |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
815 attrName.append(c) |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
816 # Step 5 |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
817 c = next(data) |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
818 # Step 7 |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
819 if c != b"=": |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
820 data.previous() |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
821 return b"".join(attrName), b"" |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
822 # Step 8 |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
823 next(data) |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
824 # Step 9 |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
825 c = data.skip() |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
826 # Step 10 |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
827 if c in (b"'", b'"'): |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
828 # 10.1 |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
829 quoteChar = c |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
830 while True: |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
831 # 10.2 |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
832 c = next(data) |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
833 # 10.3 |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
834 if c == quoteChar: |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
835 next(data) |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
836 return b"".join(attrName), b"".join(attrValue) |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
837 # 10.4 |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
838 elif c in asciiUppercaseBytes: |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
839 attrValue.append(c.lower()) |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
840 # 10.5 |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
841 else: |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
842 attrValue.append(c) |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
843 elif c == b">": |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
844 return b"".join(attrName), b"" |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
845 elif c in asciiUppercaseBytes: |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
846 attrValue.append(c.lower()) |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
847 elif c is None: |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
848 return None |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
849 else: |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
850 attrValue.append(c) |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
851 # Step 11 |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
852 while True: |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
853 c = next(data) |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
854 if c in spacesAngleBrackets: |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
855 return b"".join(attrName), b"".join(attrValue) |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
856 elif c in asciiUppercaseBytes: |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
857 attrValue.append(c.lower()) |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
858 elif c is None: |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
859 return None |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
860 else: |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
861 attrValue.append(c) |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
862 |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
863 |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
864 class ContentAttrParser(object): |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
865 def __init__(self, data): |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
866 assert isinstance(data, bytes) |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
867 self.data = data |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
868 |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
869 def parse(self): |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
870 try: |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
871 # Check if the attr name is charset |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
872 # otherwise return |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
873 self.data.jumpTo(b"charset") |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
874 self.data.position += 1 |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
875 self.data.skip() |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
876 if not self.data.currentByte == b"=": |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
877 # If there is no = sign keep looking for attrs |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
878 return None |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
879 self.data.position += 1 |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
880 self.data.skip() |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
881 # Look for an encoding between matching quote marks |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
882 if self.data.currentByte in (b'"', b"'"): |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
883 quoteMark = self.data.currentByte |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
884 self.data.position += 1 |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
885 oldPosition = self.data.position |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
886 if self.data.jumpTo(quoteMark): |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
887 return self.data[oldPosition:self.data.position] |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
888 else: |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
889 return None |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
890 else: |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
891 # Unquoted value |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
892 oldPosition = self.data.position |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
893 try: |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
894 self.data.skipUntil(spaceCharactersBytes) |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
895 return self.data[oldPosition:self.data.position] |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
896 except StopIteration: |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
897 # Return the whole remaining value |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
898 return self.data[oldPosition:] |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
899 except StopIteration: |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
900 return None |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
901 |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
902 |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
903 def lookupEncoding(encoding): |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
904 """Return the python codec name corresponding to an encoding or None if the |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
905 string doesn't correspond to a valid encoding.""" |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
906 if isinstance(encoding, bytes): |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
907 try: |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
908 encoding = encoding.decode("ascii") |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
909 except UnicodeDecodeError: |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
910 return None |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
911 |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
912 if encoding is not None: |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
913 try: |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
914 return webencodings.lookup(encoding) |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
915 except AttributeError: |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
916 return None |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
917 else: |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
918 return None |