transform.py 文件源码-python代码片段

transform.py 文件源码

python

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def invert(self):
        """Invert selection so that marked events become unmarked, and vice
        versa.

        Specificaly, all marks are converted to null marks, and all null marks
        are converted to OUTSIDE marks.

        >>> html = HTML('<body>Some <em>test</em> text</body>', encoding='utf-8')
        >>> print(html | Transformer('//em').invert().trace())
        ('OUTSIDE', ('START', (QName('body'), Attrs()), (None, 1, 0)))
        ('OUTSIDE', ('TEXT', u'Some ', (None, 1, 6)))
        (None, ('START', (QName('em'), Attrs()), (None, 1, 11)))
        (None, ('TEXT', u'test', (None, 1, 15)))
        (None, ('END', QName('em'), (None, 1, 19)))
        ('OUTSIDE', ('TEXT', u' text', (None, 1, 24)))
        ('OUTSIDE', ('END', QName('body'), (None, 1, 29)))
        <body>Some <em>test</em> text</body>

        :rtype: `Transformer`
        """
        return self.apply(InvertTransformation())