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The `visit_*` and `depart_*` methods use a
heterogeneous stack, `self.context`.
When subclassing, make sure to be consistent in its use!
Examples for robust coding:
a) Override both `visit_*` and `depart_*` methods, don't call the
parent functions.
b) Extend both and unconditionally call the parent functions::
def visit_example(self, node):
if foo:
self.body.append('<div class="foo">')
html4css1.HTMLTranslator.visit_example(self, node)
def depart_example(self, node):
html4css1.HTMLTranslator.depart_example(self, node)
if foo:
self.body.append('</div>')
c) Extend both, calling the parent functions under the same
conditions::
def visit_example(self, node):
if foo:
self.body.append('<div class="foo">
')
else: # call the parent method
_html_base.HTMLTranslator.visit_example(self, node)
def depart_example(self, node):
if foo:
self.body.append('</div>
')
else: # call the parent method
_html_base.HTMLTranslator.depart_example(self, node)
d) Extend one method (call the parent), but don't otherwise use the
`self.context` stack::
def depart_example(self, node):
_html_base.HTMLTranslator.depart_example(self, node)
if foo:
# implementation-specific code
# that does not use `self.context`
self.body.append('</div>
')
This way, changes in stack use will not bite you.
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