Mercurial > repos > guerler > springsuite
annotate planemo/lib/python3.7/site-packages/bs4/formatter.py @ 0:d30785e31577 draft
"planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
| author | guerler | 
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| date | Fri, 31 Jul 2020 00:18:57 -0400 | 
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| rev | line source | 
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1 from bs4.dammit import EntitySubstitution | 
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2 | 
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3 class Formatter(EntitySubstitution): | 
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4 """Describes a strategy to use when outputting a parse tree to a string. | 
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5 | 
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6 Some parts of this strategy come from the distinction between | 
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7 HTML4, HTML5, and XML. Others are configurable by the user. | 
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8 | 
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9 Formatters are passed in as the `formatter` argument to methods | 
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10 like `PageElement.encode`. Most people won't need to think about | 
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11 formatters, and most people who need to think about them can pass | 
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12 in one of these predefined strings as `formatter` rather than | 
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13 making a new Formatter object: | 
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14 | 
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15 For HTML documents: | 
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16 * 'html' - HTML entity substitution for generic HTML documents. (default) | 
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17 * 'html5' - HTML entity substitution for HTML5 documents. | 
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18 * 'minimal' - Only make the substitutions necessary to guarantee | 
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19 valid HTML. | 
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20 * None - Do not perform any substitution. This will be faster | 
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21 but may result in invalid markup. | 
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22 | 
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23 For XML documents: | 
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24 * 'html' - Entity substitution for XHTML documents. | 
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25 * 'minimal' - Only make the substitutions necessary to guarantee | 
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26 valid XML. (default) | 
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27 * None - Do not perform any substitution. This will be faster | 
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28 but may result in invalid markup. | 
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29 """ | 
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30 # Registries of XML and HTML formatters. | 
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31 XML_FORMATTERS = {} | 
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32 HTML_FORMATTERS = {} | 
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33 | 
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34 HTML = 'html' | 
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35 XML = 'xml' | 
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36 | 
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37 HTML_DEFAULTS = dict( | 
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38 cdata_containing_tags=set(["script", "style"]), | 
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39 ) | 
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40 | 
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41 def _default(self, language, value, kwarg): | 
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42 if value is not None: | 
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43 return value | 
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44 if language == self.XML: | 
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45 return set() | 
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46 return self.HTML_DEFAULTS[kwarg] | 
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47 | 
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48 def __init__( | 
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49 self, language=None, entity_substitution=None, | 
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50 void_element_close_prefix='/', cdata_containing_tags=None, | 
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51 ): | 
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52 """Constructor. | 
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53 | 
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54 :param language: This should be Formatter.XML if you are formatting | 
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55 XML markup and Formatter.HTML if you are formatting HTML markup. | 
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56 | 
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57 :param entity_substitution: A function to call to replace special | 
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58 characters with XML/HTML entities. For examples, see | 
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59 bs4.dammit.EntitySubstitution.substitute_html and substitute_xml. | 
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60 :param void_element_close_prefix: By default, void elements | 
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61 are represented as <tag/> (XML rules) rather than <tag> | 
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62 (HTML rules). To get <tag>, pass in the empty string. | 
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63 :param cdata_containing_tags: The list of tags that are defined | 
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64 as containing CDATA in this dialect. For example, in HTML, | 
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65 <script> and <style> tags are defined as containing CDATA, | 
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66 and their contents should not be formatted. | 
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67 """ | 
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68 self.language = language | 
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69 self.entity_substitution = entity_substitution | 
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70 self.void_element_close_prefix = void_element_close_prefix | 
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71 self.cdata_containing_tags = self._default( | 
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72 language, cdata_containing_tags, 'cdata_containing_tags' | 
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73 ) | 
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74 | 
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75 def substitute(self, ns): | 
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76 """Process a string that needs to undergo entity substitution. | 
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77 This may be a string encountered in an attribute value or as | 
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78 text. | 
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79 | 
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80 :param ns: A string. | 
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81 :return: A string with certain characters replaced by named | 
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82 or numeric entities. | 
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83 """ | 
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84 if not self.entity_substitution: | 
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85 return ns | 
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86 from .element import NavigableString | 
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87 if (isinstance(ns, NavigableString) | 
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88 and ns.parent is not None | 
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89 and ns.parent.name in self.cdata_containing_tags): | 
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90 # Do nothing. | 
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91 return ns | 
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92 # Substitute. | 
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93 return self.entity_substitution(ns) | 
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94 | 
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95 def attribute_value(self, value): | 
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96 """Process the value of an attribute. | 
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97 | 
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98 :param ns: A string. | 
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99 :return: A string with certain characters replaced by named | 
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100 or numeric entities. | 
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101 """ | 
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102 return self.substitute(value) | 
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103 | 
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104 def attributes(self, tag): | 
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105 """Reorder a tag's attributes however you want. | 
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106 | 
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107 By default, attributes are sorted alphabetically. This makes | 
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108 behavior consistent between Python 2 and Python 3, and preserves | 
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109 backwards compatibility with older versions of Beautiful Soup. | 
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110 """ | 
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111 if tag.attrs is None: | 
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112 return [] | 
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113 return sorted(tag.attrs.items()) | 
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114 | 
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115 | 
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116 class HTMLFormatter(Formatter): | 
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117 """A generic Formatter for HTML.""" | 
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118 REGISTRY = {} | 
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119 def __init__(self, *args, **kwargs): | 
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120 return super(HTMLFormatter, self).__init__(self.HTML, *args, **kwargs) | 
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121 | 
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122 | 
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123 class XMLFormatter(Formatter): | 
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124 """A generic Formatter for XML.""" | 
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125 REGISTRY = {} | 
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126 def __init__(self, *args, **kwargs): | 
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127 return super(XMLFormatter, self).__init__(self.XML, *args, **kwargs) | 
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128 | 
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129 | 
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130 # Set up aliases for the default formatters. | 
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131 HTMLFormatter.REGISTRY['html'] = HTMLFormatter( | 
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132 entity_substitution=EntitySubstitution.substitute_html | 
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133 ) | 
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134 HTMLFormatter.REGISTRY["html5"] = HTMLFormatter( | 
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135 entity_substitution=EntitySubstitution.substitute_html, | 
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136 void_element_close_prefix = None | 
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137 ) | 
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138 HTMLFormatter.REGISTRY["minimal"] = HTMLFormatter( | 
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139 entity_substitution=EntitySubstitution.substitute_xml | 
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140 ) | 
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141 HTMLFormatter.REGISTRY[None] = HTMLFormatter( | 
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142 entity_substitution=None | 
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143 ) | 
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144 XMLFormatter.REGISTRY["html"] = XMLFormatter( | 
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145 entity_substitution=EntitySubstitution.substitute_html | 
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146 ) | 
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147 XMLFormatter.REGISTRY["minimal"] = XMLFormatter( | 
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148 entity_substitution=EntitySubstitution.substitute_xml | 
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149 ) | 
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150 XMLFormatter.REGISTRY[None] = Formatter( | 
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151 Formatter(Formatter.XML, entity_substitution=None) | 
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152 ) | 
