Mercurial > repos > shellac > sam_consensus_v3
annotate env/lib/python3.9/site-packages/bs4/__init__.py @ 0:4f3585e2f14b draft default tip
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author | shellac |
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date | Mon, 22 Mar 2021 18:12:50 +0000 |
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1 """Beautiful Soup Elixir and Tonic - "The Screen-Scraper's Friend". |
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2 |
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3 http://www.crummy.com/software/BeautifulSoup/ |
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4 |
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5 Beautiful Soup uses a pluggable XML or HTML parser to parse a |
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6 (possibly invalid) document into a tree representation. Beautiful Soup |
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7 provides methods and Pythonic idioms that make it easy to navigate, |
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8 search, and modify the parse tree. |
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9 |
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10 Beautiful Soup works with Python 2.7 and up. It works better if lxml |
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11 and/or html5lib is installed. |
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12 |
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13 For more than you ever wanted to know about Beautiful Soup, see the |
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14 documentation: http://www.crummy.com/software/BeautifulSoup/bs4/doc/ |
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15 """ |
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16 |
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17 __author__ = "Leonard Richardson (leonardr@segfault.org)" |
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18 __version__ = "4.9.3" |
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19 __copyright__ = "Copyright (c) 2004-2020 Leonard Richardson" |
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20 # Use of this source code is governed by the MIT license. |
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21 __license__ = "MIT" |
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22 |
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23 __all__ = ['BeautifulSoup'] |
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24 |
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25 from collections import Counter |
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26 import os |
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27 import re |
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28 import sys |
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29 import traceback |
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30 import warnings |
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31 |
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32 from .builder import builder_registry, ParserRejectedMarkup |
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33 from .dammit import UnicodeDammit |
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34 from .element import ( |
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35 CData, |
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36 Comment, |
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37 DEFAULT_OUTPUT_ENCODING, |
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38 Declaration, |
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39 Doctype, |
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40 NavigableString, |
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41 PageElement, |
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42 ProcessingInstruction, |
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43 PYTHON_SPECIFIC_ENCODINGS, |
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44 ResultSet, |
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45 Script, |
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46 Stylesheet, |
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47 SoupStrainer, |
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48 Tag, |
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49 TemplateString, |
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50 ) |
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51 |
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52 # The very first thing we do is give a useful error if someone is |
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53 # running this code under Python 3 without converting it. |
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54 'You are trying to run the Python 2 version of Beautiful Soup under Python 3. This will not work.'!='You need to convert the code, either by installing it (`python setup.py install`) or by running 2to3 (`2to3 -w bs4`).' |
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55 |
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56 # Define some custom warnings. |
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57 class GuessedAtParserWarning(UserWarning): |
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58 """The warning issued when BeautifulSoup has to guess what parser to |
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59 use -- probably because no parser was specified in the constructor. |
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60 """ |
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61 |
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62 class MarkupResemblesLocatorWarning(UserWarning): |
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63 """The warning issued when BeautifulSoup is given 'markup' that |
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64 actually looks like a resource locator -- a URL or a path to a file |
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65 on disk. |
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66 """ |
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67 |
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68 |
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69 class BeautifulSoup(Tag): |
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70 """A data structure representing a parsed HTML or XML document. |
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71 |
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72 Most of the methods you'll call on a BeautifulSoup object are inherited from |
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73 PageElement or Tag. |
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74 |
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75 Internally, this class defines the basic interface called by the |
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76 tree builders when converting an HTML/XML document into a data |
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77 structure. The interface abstracts away the differences between |
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78 parsers. To write a new tree builder, you'll need to understand |
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79 these methods as a whole. |
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80 |
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81 These methods will be called by the BeautifulSoup constructor: |
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82 * reset() |
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83 * feed(markup) |
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84 |
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85 The tree builder may call these methods from its feed() implementation: |
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86 * handle_starttag(name, attrs) # See note about return value |
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87 * handle_endtag(name) |
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88 * handle_data(data) # Appends to the current data node |
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89 * endData(containerClass) # Ends the current data node |
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90 |
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91 No matter how complicated the underlying parser is, you should be |
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92 able to build a tree using 'start tag' events, 'end tag' events, |
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93 'data' events, and "done with data" events. |
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94 |
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95 If you encounter an empty-element tag (aka a self-closing tag, |
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96 like HTML's <br> tag), call handle_starttag and then |
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97 handle_endtag. |
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98 """ |
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99 |
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100 # Since BeautifulSoup subclasses Tag, it's possible to treat it as |
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101 # a Tag with a .name. This name makes it clear the BeautifulSoup |
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102 # object isn't a real markup tag. |
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103 ROOT_TAG_NAME = '[document]' |
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104 |
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105 # If the end-user gives no indication which tree builder they |
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106 # want, look for one with these features. |
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107 DEFAULT_BUILDER_FEATURES = ['html', 'fast'] |
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108 |
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109 # A string containing all ASCII whitespace characters, used in |
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110 # endData() to detect data chunks that seem 'empty'. |
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111 ASCII_SPACES = '\x20\x0a\x09\x0c\x0d' |
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112 |
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113 NO_PARSER_SPECIFIED_WARNING = "No parser was explicitly specified, so I'm using the best available %(markup_type)s parser for this system (\"%(parser)s\"). This usually isn't a problem, but if you run this code on another system, or in a different virtual environment, it may use a different parser and behave differently.\n\nThe code that caused this warning is on line %(line_number)s of the file %(filename)s. To get rid of this warning, pass the additional argument 'features=\"%(parser)s\"' to the BeautifulSoup constructor.\n" |
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114 |
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115 def __init__(self, markup="", features=None, builder=None, |
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116 parse_only=None, from_encoding=None, exclude_encodings=None, |
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117 element_classes=None, **kwargs): |
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118 """Constructor. |
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119 |
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120 :param markup: A string or a file-like object representing |
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121 markup to be parsed. |
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122 |
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123 :param features: Desirable features of the parser to be |
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124 used. This may be the name of a specific parser ("lxml", |
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125 "lxml-xml", "html.parser", or "html5lib") or it may be the |
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126 type of markup to be used ("html", "html5", "xml"). It's |
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127 recommended that you name a specific parser, so that |
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128 Beautiful Soup gives you the same results across platforms |
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129 and virtual environments. |
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130 |
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131 :param builder: A TreeBuilder subclass to instantiate (or |
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132 instance to use) instead of looking one up based on |
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133 `features`. You only need to use this if you've implemented a |
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134 custom TreeBuilder. |
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135 |
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136 :param parse_only: A SoupStrainer. Only parts of the document |
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137 matching the SoupStrainer will be considered. This is useful |
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138 when parsing part of a document that would otherwise be too |
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139 large to fit into memory. |
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140 |
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141 :param from_encoding: A string indicating the encoding of the |
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142 document to be parsed. Pass this in if Beautiful Soup is |
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143 guessing wrongly about the document's encoding. |
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144 |
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145 :param exclude_encodings: A list of strings indicating |
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146 encodings known to be wrong. Pass this in if you don't know |
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147 the document's encoding but you know Beautiful Soup's guess is |
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148 wrong. |
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149 |
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150 :param element_classes: A dictionary mapping BeautifulSoup |
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151 classes like Tag and NavigableString, to other classes you'd |
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152 like to be instantiated instead as the parse tree is |
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153 built. This is useful for subclassing Tag or NavigableString |
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154 to modify default behavior. |
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155 |
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156 :param kwargs: For backwards compatibility purposes, the |
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157 constructor accepts certain keyword arguments used in |
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158 Beautiful Soup 3. None of these arguments do anything in |
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159 Beautiful Soup 4; they will result in a warning and then be |
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160 ignored. |
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161 |
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162 Apart from this, any keyword arguments passed into the |
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163 BeautifulSoup constructor are propagated to the TreeBuilder |
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164 constructor. This makes it possible to configure a |
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165 TreeBuilder by passing in arguments, not just by saying which |
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166 one to use. |
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167 """ |
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168 if 'convertEntities' in kwargs: |
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169 del kwargs['convertEntities'] |
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170 warnings.warn( |
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171 "BS4 does not respect the convertEntities argument to the " |
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172 "BeautifulSoup constructor. Entities are always converted " |
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173 "to Unicode characters.") |
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174 |
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175 if 'markupMassage' in kwargs: |
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176 del kwargs['markupMassage'] |
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177 warnings.warn( |
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178 "BS4 does not respect the markupMassage argument to the " |
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179 "BeautifulSoup constructor. The tree builder is responsible " |
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180 "for any necessary markup massage.") |
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181 |
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182 if 'smartQuotesTo' in kwargs: |
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183 del kwargs['smartQuotesTo'] |
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184 warnings.warn( |
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185 "BS4 does not respect the smartQuotesTo argument to the " |
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186 "BeautifulSoup constructor. Smart quotes are always converted " |
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187 "to Unicode characters.") |
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188 |
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189 if 'selfClosingTags' in kwargs: |
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190 del kwargs['selfClosingTags'] |
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191 warnings.warn( |
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192 "BS4 does not respect the selfClosingTags argument to the " |
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193 "BeautifulSoup constructor. The tree builder is responsible " |
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194 "for understanding self-closing tags.") |
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195 |
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196 if 'isHTML' in kwargs: |
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197 del kwargs['isHTML'] |
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198 warnings.warn( |
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199 "BS4 does not respect the isHTML argument to the " |
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200 "BeautifulSoup constructor. Suggest you use " |
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201 "features='lxml' for HTML and features='lxml-xml' for " |
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202 "XML.") |
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203 |
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204 def deprecated_argument(old_name, new_name): |
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205 if old_name in kwargs: |
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206 warnings.warn( |
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207 'The "%s" argument to the BeautifulSoup constructor ' |
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208 'has been renamed to "%s."' % (old_name, new_name)) |
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209 value = kwargs[old_name] |
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210 del kwargs[old_name] |
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211 return value |
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212 return None |
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213 |
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214 parse_only = parse_only or deprecated_argument( |
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215 "parseOnlyThese", "parse_only") |
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216 |
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217 from_encoding = from_encoding or deprecated_argument( |
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218 "fromEncoding", "from_encoding") |
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219 |
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220 if from_encoding and isinstance(markup, str): |
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221 warnings.warn("You provided Unicode markup but also provided a value for from_encoding. Your from_encoding will be ignored.") |
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222 from_encoding = None |
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223 |
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224 self.element_classes = element_classes or dict() |
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225 |
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226 # We need this information to track whether or not the builder |
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227 # was specified well enough that we can omit the 'you need to |
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228 # specify a parser' warning. |
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229 original_builder = builder |
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230 original_features = features |
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231 |
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232 if isinstance(builder, type): |
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233 # A builder class was passed in; it needs to be instantiated. |
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234 builder_class = builder |
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235 builder = None |
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236 elif builder is None: |
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237 if isinstance(features, str): |
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238 features = [features] |
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239 if features is None or len(features) == 0: |
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240 features = self.DEFAULT_BUILDER_FEATURES |
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241 builder_class = builder_registry.lookup(*features) |
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242 if builder_class is None: |
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243 raise FeatureNotFound( |
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244 "Couldn't find a tree builder with the features you " |
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245 "requested: %s. Do you need to install a parser library?" |
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246 % ",".join(features)) |
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247 |
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248 # At this point either we have a TreeBuilder instance in |
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249 # builder, or we have a builder_class that we can instantiate |
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250 # with the remaining **kwargs. |
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251 if builder is None: |
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252 builder = builder_class(**kwargs) |
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253 if not original_builder and not ( |
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254 original_features == builder.NAME or |
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255 original_features in builder.ALTERNATE_NAMES |
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256 ) and markup: |
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257 # The user did not tell us which TreeBuilder to use, |
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258 # and we had to guess. Issue a warning. |
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259 if builder.is_xml: |
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260 markup_type = "XML" |
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261 else: |
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262 markup_type = "HTML" |
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263 |
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264 # This code adapted from warnings.py so that we get the same line |
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265 # of code as our warnings.warn() call gets, even if the answer is wrong |
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266 # (as it may be in a multithreading situation). |
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267 caller = None |
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268 try: |
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269 caller = sys._getframe(1) |
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270 except ValueError: |
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271 pass |
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272 if caller: |
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273 globals = caller.f_globals |
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274 line_number = caller.f_lineno |
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275 else: |
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276 globals = sys.__dict__ |
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277 line_number= 1 |
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278 filename = globals.get('__file__') |
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279 if filename: |
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280 fnl = filename.lower() |
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281 if fnl.endswith((".pyc", ".pyo")): |
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282 filename = filename[:-1] |
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283 if filename: |
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284 # If there is no filename at all, the user is most likely in a REPL, |
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285 # and the warning is not necessary. |
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286 values = dict( |
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287 filename=filename, |
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288 line_number=line_number, |
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289 parser=builder.NAME, |
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290 markup_type=markup_type |
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291 ) |
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292 warnings.warn( |
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293 self.NO_PARSER_SPECIFIED_WARNING % values, |
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294 GuessedAtParserWarning, stacklevel=2 |
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295 ) |
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296 else: |
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297 if kwargs: |
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298 warnings.warn("Keyword arguments to the BeautifulSoup constructor will be ignored. These would normally be passed into the TreeBuilder constructor, but a TreeBuilder instance was passed in as `builder`.") |
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299 |
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300 self.builder = builder |
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301 self.is_xml = builder.is_xml |
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302 self.known_xml = self.is_xml |
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303 self._namespaces = dict() |
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304 self.parse_only = parse_only |
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305 |
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306 self.builder.initialize_soup(self) |
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307 |
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308 if hasattr(markup, 'read'): # It's a file-type object. |
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309 markup = markup.read() |
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310 elif len(markup) <= 256 and ( |
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311 (isinstance(markup, bytes) and not b'<' in markup) |
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312 or (isinstance(markup, str) and not '<' in markup) |
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313 ): |
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314 # Print out warnings for a couple beginner problems |
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315 # involving passing non-markup to Beautiful Soup. |
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316 # Beautiful Soup will still parse the input as markup, |
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317 # just in case that's what the user really wants. |
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318 if (isinstance(markup, str) |
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319 and not os.path.supports_unicode_filenames): |
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320 possible_filename = markup.encode("utf8") |
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321 else: |
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322 possible_filename = markup |
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323 is_file = False |
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324 try: |
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325 is_file = os.path.exists(possible_filename) |
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326 except Exception as e: |
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327 # This is almost certainly a problem involving |
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328 # characters not valid in filenames on this |
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329 # system. Just let it go. |
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330 pass |
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331 if is_file: |
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332 warnings.warn( |
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333 '"%s" looks like a filename, not markup. You should' |
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334 ' probably open this file and pass the filehandle into' |
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335 ' Beautiful Soup.' % self._decode_markup(markup), |
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336 MarkupResemblesLocatorWarning |
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337 ) |
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338 self._check_markup_is_url(markup) |
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339 |
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340 rejections = [] |
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341 success = False |
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342 for (self.markup, self.original_encoding, self.declared_html_encoding, |
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343 self.contains_replacement_characters) in ( |
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344 self.builder.prepare_markup( |
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345 markup, from_encoding, exclude_encodings=exclude_encodings)): |
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346 self.reset() |
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347 try: |
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348 self._feed() |
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349 success = True |
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350 break |
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351 except ParserRejectedMarkup as e: |
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352 rejections.append(e) |
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353 pass |
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354 |
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355 if not success: |
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356 other_exceptions = [str(e) for e in rejections] |
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357 raise ParserRejectedMarkup( |
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358 "The markup you provided was rejected by the parser. Trying a different parser or a different encoding may help.\n\nOriginal exception(s) from parser:\n " + "\n ".join(other_exceptions) |
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359 ) |
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360 |
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361 # Clear out the markup and remove the builder's circular |
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362 # reference to this object. |
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363 self.markup = None |
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364 self.builder.soup = None |
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365 |
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366 def __copy__(self): |
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367 """Copy a BeautifulSoup object by converting the document to a string and parsing it again.""" |
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368 copy = type(self)( |
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369 self.encode('utf-8'), builder=self.builder, from_encoding='utf-8' |
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370 ) |
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371 |
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372 # Although we encoded the tree to UTF-8, that may not have |
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373 # been the encoding of the original markup. Set the copy's |
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374 # .original_encoding to reflect the original object's |
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375 # .original_encoding. |
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376 copy.original_encoding = self.original_encoding |
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377 return copy |
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378 |
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379 def __getstate__(self): |
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380 # Frequently a tree builder can't be pickled. |
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381 d = dict(self.__dict__) |
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382 if 'builder' in d and not self.builder.picklable: |
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383 d['builder'] = None |
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384 return d |
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385 |
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386 @classmethod |
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387 def _decode_markup(cls, markup): |
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388 """Ensure `markup` is bytes so it's safe to send into warnings.warn. |
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389 |
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390 TODO: warnings.warn had this problem back in 2010 but it might not |
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391 anymore. |
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392 """ |
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393 if isinstance(markup, bytes): |
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394 decoded = markup.decode('utf-8', 'replace') |
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395 else: |
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396 decoded = markup |
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397 return decoded |
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398 |
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399 @classmethod |
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400 def _check_markup_is_url(cls, markup): |
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401 """Error-handling method to raise a warning if incoming markup looks |
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402 like a URL. |
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403 |
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404 :param markup: A string. |
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405 """ |
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406 if isinstance(markup, bytes): |
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407 space = b' ' |
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408 cant_start_with = (b"http:", b"https:") |
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409 elif isinstance(markup, str): |
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410 space = ' ' |
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411 cant_start_with = ("http:", "https:") |
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412 else: |
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413 return |
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414 |
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415 if any(markup.startswith(prefix) for prefix in cant_start_with): |
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416 if not space in markup: |
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417 warnings.warn( |
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418 '"%s" looks like a URL. Beautiful Soup is not an' |
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419 ' HTTP client. You should probably use an HTTP client like' |
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420 ' requests to get the document behind the URL, and feed' |
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421 ' that document to Beautiful Soup.' % cls._decode_markup( |
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422 markup |
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423 ), |
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424 MarkupResemblesLocatorWarning |
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425 ) |
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426 |
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427 def _feed(self): |
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428 """Internal method that parses previously set markup, creating a large |
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429 number of Tag and NavigableString objects. |
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430 """ |
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431 # Convert the document to Unicode. |
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432 self.builder.reset() |
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433 |
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434 self.builder.feed(self.markup) |
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435 # Close out any unfinished strings and close all the open tags. |
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436 self.endData() |
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437 while self.currentTag.name != self.ROOT_TAG_NAME: |
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438 self.popTag() |
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439 |
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440 def reset(self): |
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441 """Reset this object to a state as though it had never parsed any |
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442 markup. |
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443 """ |
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444 Tag.__init__(self, self, self.builder, self.ROOT_TAG_NAME) |
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445 self.hidden = 1 |
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446 self.builder.reset() |
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447 self.current_data = [] |
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448 self.currentTag = None |
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449 self.tagStack = [] |
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450 self.open_tag_counter = Counter() |
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451 self.preserve_whitespace_tag_stack = [] |
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452 self.string_container_stack = [] |
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453 self.pushTag(self) |
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454 |
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455 def new_tag(self, name, namespace=None, nsprefix=None, attrs={}, |
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456 sourceline=None, sourcepos=None, **kwattrs): |
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457 """Create a new Tag associated with this BeautifulSoup object. |
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458 |
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459 :param name: The name of the new Tag. |
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460 :param namespace: The URI of the new Tag's XML namespace, if any. |
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461 :param prefix: The prefix for the new Tag's XML namespace, if any. |
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462 :param attrs: A dictionary of this Tag's attribute values; can |
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463 be used instead of `kwattrs` for attributes like 'class' |
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464 that are reserved words in Python. |
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465 :param sourceline: The line number where this tag was |
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466 (purportedly) found in its source document. |
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467 :param sourcepos: The character position within `sourceline` where this |
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468 tag was (purportedly) found. |
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469 :param kwattrs: Keyword arguments for the new Tag's attribute values. |
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470 |
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471 """ |
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472 kwattrs.update(attrs) |
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473 return self.element_classes.get(Tag, Tag)( |
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474 None, self.builder, name, namespace, nsprefix, kwattrs, |
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475 sourceline=sourceline, sourcepos=sourcepos |
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476 ) |
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477 |
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478 def string_container(self, base_class=None): |
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479 container = base_class or NavigableString |
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480 |
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481 # There may be a general override of NavigableString. |
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482 container = self.element_classes.get( |
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483 container, container |
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484 ) |
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485 |
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486 # On top of that, we may be inside a tag that needs a special |
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487 # container class. |
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488 if self.string_container_stack: |
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489 container = self.builder.string_containers.get( |
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490 self.string_container_stack[-1].name, container |
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491 ) |
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492 return container |
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493 |
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494 def new_string(self, s, subclass=None): |
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495 """Create a new NavigableString associated with this BeautifulSoup |
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496 object. |
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497 """ |
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498 container = self.string_container(subclass) |
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499 return container(s) |
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500 |
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501 def insert_before(self, *args): |
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502 """This method is part of the PageElement API, but `BeautifulSoup` doesn't implement |
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503 it because there is nothing before or after it in the parse tree. |
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504 """ |
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505 raise NotImplementedError("BeautifulSoup objects don't support insert_before().") |
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506 |
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507 def insert_after(self, *args): |
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508 """This method is part of the PageElement API, but `BeautifulSoup` doesn't implement |
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509 it because there is nothing before or after it in the parse tree. |
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510 """ |
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511 raise NotImplementedError("BeautifulSoup objects don't support insert_after().") |
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512 |
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513 def popTag(self): |
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514 """Internal method called by _popToTag when a tag is closed.""" |
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515 tag = self.tagStack.pop() |
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516 if tag.name in self.open_tag_counter: |
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517 self.open_tag_counter[tag.name] -= 1 |
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518 if self.preserve_whitespace_tag_stack and tag == self.preserve_whitespace_tag_stack[-1]: |
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519 self.preserve_whitespace_tag_stack.pop() |
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520 if self.string_container_stack and tag == self.string_container_stack[-1]: |
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521 self.string_container_stack.pop() |
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522 #print("Pop", tag.name) |
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523 if self.tagStack: |
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524 self.currentTag = self.tagStack[-1] |
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525 return self.currentTag |
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526 |
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527 def pushTag(self, tag): |
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528 """Internal method called by handle_starttag when a tag is opened.""" |
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529 #print("Push", tag.name) |
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530 if self.currentTag is not None: |
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531 self.currentTag.contents.append(tag) |
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532 self.tagStack.append(tag) |
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533 self.currentTag = self.tagStack[-1] |
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534 if tag.name != self.ROOT_TAG_NAME: |
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535 self.open_tag_counter[tag.name] += 1 |
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536 if tag.name in self.builder.preserve_whitespace_tags: |
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537 self.preserve_whitespace_tag_stack.append(tag) |
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538 if tag.name in self.builder.string_containers: |
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539 self.string_container_stack.append(tag) |
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540 |
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541 def endData(self, containerClass=None): |
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542 """Method called by the TreeBuilder when the end of a data segment |
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543 occurs. |
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544 """ |
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545 containerClass = self.string_container(containerClass) |
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546 |
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547 if self.current_data: |
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548 current_data = ''.join(self.current_data) |
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549 # If whitespace is not preserved, and this string contains |
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550 # nothing but ASCII spaces, replace it with a single space |
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551 # or newline. |
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552 if not self.preserve_whitespace_tag_stack: |
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553 strippable = True |
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554 for i in current_data: |
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555 if i not in self.ASCII_SPACES: |
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556 strippable = False |
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557 break |
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558 if strippable: |
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559 if '\n' in current_data: |
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560 current_data = '\n' |
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561 else: |
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562 current_data = ' ' |
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563 |
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564 # Reset the data collector. |
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565 self.current_data = [] |
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566 |
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567 # Should we add this string to the tree at all? |
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568 if self.parse_only and len(self.tagStack) <= 1 and \ |
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569 (not self.parse_only.text or \ |
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570 not self.parse_only.search(current_data)): |
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571 return |
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572 |
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573 o = containerClass(current_data) |
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574 self.object_was_parsed(o) |
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575 |
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576 def object_was_parsed(self, o, parent=None, most_recent_element=None): |
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577 """Method called by the TreeBuilder to integrate an object into the parse tree.""" |
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578 if parent is None: |
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579 parent = self.currentTag |
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580 if most_recent_element is not None: |
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581 previous_element = most_recent_element |
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582 else: |
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583 previous_element = self._most_recent_element |
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584 |
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585 next_element = previous_sibling = next_sibling = None |
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586 if isinstance(o, Tag): |
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587 next_element = o.next_element |
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588 next_sibling = o.next_sibling |
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589 previous_sibling = o.previous_sibling |
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590 if previous_element is None: |
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591 previous_element = o.previous_element |
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592 |
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593 fix = parent.next_element is not None |
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594 |
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595 o.setup(parent, previous_element, next_element, previous_sibling, next_sibling) |
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596 |
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597 self._most_recent_element = o |
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598 parent.contents.append(o) |
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599 |
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600 # Check if we are inserting into an already parsed node. |
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601 if fix: |
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602 self._linkage_fixer(parent) |
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603 |
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604 def _linkage_fixer(self, el): |
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605 """Make sure linkage of this fragment is sound.""" |
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606 |
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607 first = el.contents[0] |
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608 child = el.contents[-1] |
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609 descendant = child |
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610 |
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611 if child is first and el.parent is not None: |
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612 # Parent should be linked to first child |
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613 el.next_element = child |
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614 # We are no longer linked to whatever this element is |
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615 prev_el = child.previous_element |
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616 if prev_el is not None and prev_el is not el: |
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617 prev_el.next_element = None |
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618 # First child should be linked to the parent, and no previous siblings. |
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619 child.previous_element = el |
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620 child.previous_sibling = None |
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621 |
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622 # We have no sibling as we've been appended as the last. |
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623 child.next_sibling = None |
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624 |
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625 # This index is a tag, dig deeper for a "last descendant" |
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626 if isinstance(child, Tag) and child.contents: |
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627 descendant = child._last_descendant(False) |
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|
628 |
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629 # As the final step, link last descendant. It should be linked |
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630 # to the parent's next sibling (if found), else walk up the chain |
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631 # and find a parent with a sibling. It should have no next sibling. |
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632 descendant.next_element = None |
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633 descendant.next_sibling = None |
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634 target = el |
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|
635 while True: |
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636 if target is None: |
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|
637 break |
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638 elif target.next_sibling is not None: |
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639 descendant.next_element = target.next_sibling |
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640 target.next_sibling.previous_element = child |
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641 break |
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642 target = target.parent |
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|
643 |
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644 def _popToTag(self, name, nsprefix=None, inclusivePop=True): |
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645 """Pops the tag stack up to and including the most recent |
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646 instance of the given tag. |
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647 |
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648 If there are no open tags with the given name, nothing will be |
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649 popped. |
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|
650 |
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651 :param name: Pop up to the most recent tag with this name. |
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652 :param nsprefix: The namespace prefix that goes with `name`. |
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653 :param inclusivePop: It this is false, pops the tag stack up |
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654 to but *not* including the most recent instqance of the |
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655 given tag. |
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656 |
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657 """ |
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658 #print("Popping to %s" % name) |
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659 if name == self.ROOT_TAG_NAME: |
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660 # The BeautifulSoup object itself can never be popped. |
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661 return |
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662 |
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663 most_recently_popped = None |
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664 |
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665 stack_size = len(self.tagStack) |
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666 for i in range(stack_size - 1, 0, -1): |
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667 if not self.open_tag_counter.get(name): |
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668 break |
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669 t = self.tagStack[i] |
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670 if (name == t.name and nsprefix == t.prefix): |
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671 if inclusivePop: |
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672 most_recently_popped = self.popTag() |
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673 break |
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674 most_recently_popped = self.popTag() |
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675 |
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676 return most_recently_popped |
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677 |
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678 def handle_starttag(self, name, namespace, nsprefix, attrs, sourceline=None, |
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679 sourcepos=None): |
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680 """Called by the tree builder when a new tag is encountered. |
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681 |
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682 :param name: Name of the tag. |
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683 :param nsprefix: Namespace prefix for the tag. |
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684 :param attrs: A dictionary of attribute values. |
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685 :param sourceline: The line number where this tag was found in its |
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686 source document. |
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687 :param sourcepos: The character position within `sourceline` where this |
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688 tag was found. |
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689 |
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690 If this method returns None, the tag was rejected by an active |
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691 SoupStrainer. You should proceed as if the tag had not occurred |
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692 in the document. For instance, if this was a self-closing tag, |
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693 don't call handle_endtag. |
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694 """ |
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695 # print("Start tag %s: %s" % (name, attrs)) |
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696 self.endData() |
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697 |
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698 if (self.parse_only and len(self.tagStack) <= 1 |
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699 and (self.parse_only.text |
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700 or not self.parse_only.search_tag(name, attrs))): |
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701 return None |
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702 |
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703 tag = self.element_classes.get(Tag, Tag)( |
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704 self, self.builder, name, namespace, nsprefix, attrs, |
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705 self.currentTag, self._most_recent_element, |
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706 sourceline=sourceline, sourcepos=sourcepos |
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707 ) |
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708 if tag is None: |
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709 return tag |
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710 if self._most_recent_element is not None: |
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711 self._most_recent_element.next_element = tag |
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712 self._most_recent_element = tag |
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713 self.pushTag(tag) |
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714 return tag |
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715 |
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716 def handle_endtag(self, name, nsprefix=None): |
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717 """Called by the tree builder when an ending tag is encountered. |
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718 |
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719 :param name: Name of the tag. |
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720 :param nsprefix: Namespace prefix for the tag. |
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721 """ |
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722 #print("End tag: " + name) |
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723 self.endData() |
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724 self._popToTag(name, nsprefix) |
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725 |
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726 def handle_data(self, data): |
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727 """Called by the tree builder when a chunk of textual data is encountered.""" |
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728 self.current_data.append(data) |
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729 |
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730 def decode(self, pretty_print=False, |
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731 eventual_encoding=DEFAULT_OUTPUT_ENCODING, |
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732 formatter="minimal"): |
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733 """Returns a string or Unicode representation of the parse tree |
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734 as an HTML or XML document. |
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735 |
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736 :param pretty_print: If this is True, indentation will be used to |
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737 make the document more readable. |
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738 :param eventual_encoding: The encoding of the final document. |
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739 If this is None, the document will be a Unicode string. |
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740 """ |
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741 if self.is_xml: |
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742 # Print the XML declaration |
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743 encoding_part = '' |
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744 if eventual_encoding in PYTHON_SPECIFIC_ENCODINGS: |
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745 # This is a special Python encoding; it can't actually |
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746 # go into an XML document because it means nothing |
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747 # outside of Python. |
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748 eventual_encoding = None |
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749 if eventual_encoding != None: |
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750 encoding_part = ' encoding="%s"' % eventual_encoding |
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751 prefix = '<?xml version="1.0"%s?>\n' % encoding_part |
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752 else: |
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753 prefix = '' |
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754 if not pretty_print: |
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755 indent_level = None |
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756 else: |
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757 indent_level = 0 |
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758 return prefix + super(BeautifulSoup, self).decode( |
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759 indent_level, eventual_encoding, formatter) |
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760 |
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761 # Aliases to make it easier to get started quickly, e.g. 'from bs4 import _soup' |
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762 _s = BeautifulSoup |
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763 _soup = BeautifulSoup |
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764 |
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765 class BeautifulStoneSoup(BeautifulSoup): |
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766 """Deprecated interface to an XML parser.""" |
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767 |
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768 def __init__(self, *args, **kwargs): |
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769 kwargs['features'] = 'xml' |
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770 warnings.warn( |
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771 'The BeautifulStoneSoup class is deprecated. Instead of using ' |
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772 'it, pass features="xml" into the BeautifulSoup constructor.') |
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773 super(BeautifulStoneSoup, self).__init__(*args, **kwargs) |
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774 |
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775 |
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776 class StopParsing(Exception): |
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777 """Exception raised by a TreeBuilder if it's unable to continue parsing.""" |
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778 pass |
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779 |
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780 class FeatureNotFound(ValueError): |
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781 """Exception raised by the BeautifulSoup constructor if no parser with the |
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782 requested features is found. |
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783 """ |
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784 pass |
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785 |
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786 |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
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787 #If this file is run as a script, act as an HTML pretty-printer. |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
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788 if __name__ == '__main__': |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
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789 import sys |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
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790 soup = BeautifulSoup(sys.stdin) |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
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791 print((soup.prettify())) |