[HarfBuzz] question about indic matra group rule

[datao zhang]

Dear behdad:
 
I feel confuse for the syllable rule in  hb-ot-shape-complex-indic-machine.rl:
halant_or_matra_group = (final_halant_group | (h.ZWJ)? matra_group{0,4});
 
I can't image there any case for indic script which 4 matra followed. I can understand you decompose some matra before syllable analysis, ex: Sinhala (0xDDC, after decompose, two matra generated). So you specify more than one matra. But I don't know why it is 4, not 2.
 
Another issue is caused that you decompose matra before syllable analysis and allow more than one matra followed. ex: if we have two matras: (0xDD9,0xDD9). They will be treated as one syllable. I don't know what benefit we can get from such rule. At least it obeys those MS Specific for Indic script.
 
Any comments is appreciated?
 
Thanks!
 
Br,
Dean
 		 	   		  
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