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Fix non-determinism in diffing algorithm #247

Merged
merged 1 commit into from Nov 24, 2020
Merged

Fix non-determinism in diffing algorithm #247

merged 1 commit into from Nov 24, 2020

Commits on Nov 24, 2020

  1. Fix non-determinism in diffing algorithm

    A previous attempt to add non-determinism to the diffing algorithm
    unfortunately broke the algorithm for half the cases.
    
    This change modifies the algorithm to truly switch between starting
    with a forward search versus a reverse search.
    The main for-loop of Difference would switch repeatedly between
    performing a forward search, then a reverse search, and vice-versa.
    Since we can't jump into the middle of a for-loop to start with the
    reverse search first, we use a series of labels and goto statements
    to accomplish the same effect.
    
    Fixes #238
    dsnet committed Nov 24, 2020
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