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annotate env/lib/python3.7/site-packages/lxml/cssselect.py @ 0:26e78fe6e8c4 draft

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"planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
author shellac
date Sat, 02 May 2020 07:14:21 -0400
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1 """CSS Selectors based on XPath.
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2
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3 This module supports selecting XML/HTML tags based on CSS selectors.
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4 See the `CSSSelector` class for details.
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5
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6 This is a thin wrapper around cssselect 0.7 or later.
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7 """
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8
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9 from __future__ import absolute_import
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10
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11 from . import etree
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12 try:
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13 import cssselect as external_cssselect
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14 except ImportError:
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15 raise ImportError(
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16 'cssselect does not seem to be installed. '
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17 'See http://packages.python.org/cssselect/')
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18
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19
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20 SelectorSyntaxError = external_cssselect.SelectorSyntaxError
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21 ExpressionError = external_cssselect.ExpressionError
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22 SelectorError = external_cssselect.SelectorError
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23
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24
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25 __all__ = ['SelectorSyntaxError', 'ExpressionError', 'SelectorError',
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26 'CSSSelector']
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28
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29 class LxmlTranslator(external_cssselect.GenericTranslator):
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30 """
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31 A custom CSS selector to XPath translator with lxml-specific extensions.
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32 """
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33 def xpath_contains_function(self, xpath, function):
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34 # Defined there, removed in later drafts:
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35 # http://www.w3.org/TR/2001/CR-css3-selectors-20011113/#content-selectors
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36 if function.argument_types() not in (['STRING'], ['IDENT']):
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37 raise ExpressionError(
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38 "Expected a single string or ident for :contains(), got %r"
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39 % function.arguments)
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40 value = function.arguments[0].value
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41 return xpath.add_condition(
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42 'contains(__lxml_internal_css:lower-case(string(.)), %s)'
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43 % self.xpath_literal(value.lower()))
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44
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45
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46 class LxmlHTMLTranslator(LxmlTranslator, external_cssselect.HTMLTranslator):
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47 """
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48 lxml extensions + HTML support.
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49 """
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50
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51
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52 def _make_lower_case(context, s):
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53 return s.lower()
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54
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55 ns = etree.FunctionNamespace('http://codespeak.net/lxml/css/')
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56 ns.prefix = '__lxml_internal_css'
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57 ns['lower-case'] = _make_lower_case
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58
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59
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60 class CSSSelector(etree.XPath):
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61 """A CSS selector.
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62
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63 Usage::
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64
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65 >>> from lxml import etree, cssselect
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66 >>> select = cssselect.CSSSelector("a tag > child")
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67
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68 >>> root = etree.XML("<a><b><c/><tag><child>TEXT</child></tag></b></a>")
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69 >>> [ el.tag for el in select(root) ]
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70 ['child']
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71
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72 To use CSS namespaces, you need to pass a prefix-to-namespace
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73 mapping as ``namespaces`` keyword argument::
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74
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75 >>> rdfns = 'http://www.w3.org/1999/02/22-rdf-syntax-ns#'
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76 >>> select_ns = cssselect.CSSSelector('root > rdf|Description',
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77 ... namespaces={'rdf': rdfns})
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78
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79 >>> rdf = etree.XML((
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80 ... '<root xmlns:rdf="%s">'
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81 ... '<rdf:Description>blah</rdf:Description>'
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82 ... '</root>') % rdfns)
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83 >>> [(el.tag, el.text) for el in select_ns(rdf)]
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84 [('{http://www.w3.org/1999/02/22-rdf-syntax-ns#}Description', 'blah')]
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85
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86 """
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87 def __init__(self, css, namespaces=None, translator='xml'):
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88 if translator == 'xml':
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89 translator = LxmlTranslator()
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90 elif translator == 'html':
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91 translator = LxmlHTMLTranslator()
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92 elif translator == 'xhtml':
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93 translator = LxmlHTMLTranslator(xhtml=True)
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94 path = translator.css_to_xpath(css)
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95 etree.XPath.__init__(self, path, namespaces=namespaces)
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96 self.css = css
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97
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98 def __repr__(self):
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99 return '<%s %s for %r>' % (
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100 self.__class__.__name__,
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101 hex(abs(id(self)))[2:],
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102 self.css)