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Extract locations from context appropriately. All tests pass.

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This commit is contained in:
Chris Pressey 2018-04-25 16:58:21 +01:00
parent d037401b18
commit eb4ed6a6bc
1 changed files with 7 additions and 7 deletions
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14
src/sixtypical/analyzer.py
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@ -293,23 +293,23 @@ class Context(object):
self.set_written(dest.ref)
def extract(self, location):
"""Used in `save`."""
"""Sets the given location as writeable in the context, and returns a 'baton' representing
the previous state of context for that location. This 'baton' can be used to later restore
this state of context."""
# Used in `save`.
baton = (
location,
location in self._touched,
self._range.get(location, None),
location in self._writeable,
)
if location in self._touched:
self._touched.remove(location)
self.set_unmeaningful(location)
self.set_writeable(location)
return baton
def re_introduce(self, baton):
"""Used in `save`."""
"""Given a 'baton' produced by `extract()`, restores the context for that saved location
to what it was before `extract()` was called."""
# Used in `save`.
location, was_touched, was_range, was_writeable = baton
if was_touched: