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[indic] Don't constrain how many C, M, ... occur 

Fixes https://github.com/harfbuzz/harfbuzz/issues/1709

Part of https://github.com/harfbuzz/harfbuzz/issues/1652
This commit is contained in:
Behdad Esfahbod 2019-05-13 14:35:04 -07:00
parent 148d883680
commit b1d3e54bd3
2 changed files with 305 additions and 928 deletions
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1225
src/hb-ot-shape-complex-indic-machine.hh
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8
src/hb-ot-shape-complex-indic-machine.rl
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@ -64,14 +64,14 @@ reph = (Ra H | Repha); # possible reph
cn = c.ZWJ?.n?;
forced_rakar = ZWJ H ZWJ Ra;
symbol = Symbol.N?;
matra_group = z{0,3}.M.N?.(H | forced_rakar)?;
syllable_tail = (z?.SM.SM?.ZWNJ?)? A{0,3}?;
matra_group = z*.M.N?.(H | forced_rakar)?;
syllable_tail = (z?.SM.SM?.ZWNJ?)? A*;
halant_group = (z?.H.(ZWJ.N?)?);
final_halant_group = halant_group | H.ZWNJ;
medial_group = CM?;
halant_or_matra_group = (final_halant_group | matra_group{0,4});
halant_or_matra_group = (final_halant_group | matra_group*);
complex_syllable_tail = (halant_group.cn){0,4} medial_group halant_or_matra_group syllable_tail;
complex_syllable_tail = (halant_group.cn)* medial_group halant_or_matra_group syllable_tail;
consonant_syllable = (Repha|CS)? cn complex_syllable_tail;
vowel_syllable = reph? V.n? (ZWJ | complex_syllable_tail);