Parse IndicMatraCategory.txt #930
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In the unicodetools meeting of 2024-09-03, it came to our attention that Indic_Positional_Category used to be a provisional property called Indic_Matra_Category, renamed in UTC-140-C16 and then made informative in UTC-140-C17, for Unicode Version 8.0.
Just like we parse Indic_Syllabic_Category in versions where it was provisional, and expose it in historical views of property assignments, we should parse the provisional Indic_Matra_Category.
It seems most convenient to treat IndicMatraCategory.txt as defining InPC, since there are often no changes in assignment at the time of the renaming (specifically,
\P{U8.0:[email protected]:Indic_Positional_Category@}-\p{U7.0:Indic_Positional_Category=NA}(the set of characters that changed InPC from non-NA in 8.0) has cardinality 7, whereas\p{U8.0:[email protected]:Indic_Positional_Category@}-\p{U7.0:Indic_Positional_Category=NA}(the set of non-NA characters that did not change InPC in 8.0) has cardinality 598).Example: the history of assignments for U+0DDD:
We could add an Extra alias Indic_Matra_Category; I am not doing that for now.