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Python Markdown: rewrite cell_row_span extension
cell_row_span rewrite
This week I re-wrote the cell_row_span extension. The previous version
subclassed the tables extension, which in my opinion was the “correct” way
of doing it. However, thinking further on it, I decided it wasn’t the best
way. Subclassing has the disadvantage of leaving any future extension to the
tables processing being unable to use both cell_row_span and its own code.
The last extension to perfom the subclassing would override the previous one,
so either the cell_row_span code or the other code would simply become
unrachable at run time.
Instead, cell_row_span now hooks into the block processor before table runs,
capturing the blocks table wants to operate on. Later a tree processor runs
that locates all the tables in the document tree, and alters them as needed using
the text blocks captured by the block processor.