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# $Id: test_traversals.py 4641 2006-06-28 16:27:55Z blais $
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# Author: Martin Blais <blais@furius.ca>
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# Copyright: This module has been placed in the public domain.
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Test module for traversals.
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import DocutilsTestSupport # must be imported before docutils
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from docutils import nodes, core, io, utils, writers
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from docutils.writers.null import Writer as NullWriter
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stop_traversal_input = '''
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Happily, happily going by train.
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.. attention:: Attention, attention. This is a public annoucement.
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You must get off the train now.
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KaZoom! Train crashes.
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- Told ya!!! Get off the train next time.
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class AttentiveVisitor(nodes.SparseNodeVisitor):
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def visit_attention(self, node):
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raise nodes.StopTraversal
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def visit_bullet_list(self, node):
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raise RuntimeError("It's too late for attention, "
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"more discipline is needed!.")
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class AttentiveWriter(writers.Writer):
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self.visitor = visitor = AttentiveVisitor(self.document)
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# Test both kinds of traversals.
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self.document.walkabout(visitor)
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self.document.walk(visitor)
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class StopTraversalTests(unittest.TestCase, docutils.SettingsSpec):
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Test interrupting the visitor during traversal. In this test we stop it
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when we reach an attention node.
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def test_stop_traversal(self):
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# Load some document tree in memory.
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doctree = docutils.core.publish_doctree(
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source=stop_traversal_input,
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reader_name='standalone',
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parser_name='restructuredtext',
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self.assert_(isinstance(doctree, nodes.document))
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parts = docutils.core.publish_parts(
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reader_name='doctree', source_class=docutils.io.DocTreeInput,
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source=doctree, source_path='test',
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writer=AttentiveWriter())
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if __name__ == '__main__':
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test/test_traversals.py
