On Wednesday, December 18, 2013 8:34:21 AM UTC-6, Edward K. Ream wrote:
> Rev 6432 contains the prototype of a simpler, faster, more flexible
importer for Python files...
> This is the first of two "risky" projects needed to make @auto pretty
much a drop-in replacement for @file...
> The other risky part of the puzzle is the code that will reconstitute
clone links from nodes in the .leo file to nodes in @auto trees.
Here is p._relinkAsCloneOf, a new method that *replaces* the vnode at
position p with the vnode at position p2, thereby making p.v a clone of
p2.v:
def _relinkAsCloneOf(self,p2):
'''A low-level method to replace p.v by a p2.v.'''
p = self
v,v2 = p.v,p2.v
parent_v = p._parentVnode()
assert parent_v.children[p._childIndex] == v
parent_v.children[p._childIndex] = v2
v2.parents.append(parent_v)
p.v = p2.v # Not strictly needed, but keeps p accurate.
It took me awhile to realize that the code simply needs to change all links
to p to p2. This is easy, at least for the importer, because p is *not* a
clone. So the only link to p is in the children array of its (single)
parent vnode. In addition, v2.parents must be updated. As you can see,
the code will be extremely fast.
This code passes a pretty hefty unit test. It seems like the crucial part
of relinking is in place.
Edward
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