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[myanmar] Relax pwo-tone group a bit 

This is broken sequence according to OpenType spec, Uniscribe,
and current HarfBuzz implementation.  But Roozbeh says this
is a valid sequence, so allow it.  There are multiple
"(DB As?)?" constructs in the grammar, but Roozbeh thinks only
this one needs changing.

Test case: 1014,1063,103A

Fixes https://bugs.freedesktop.org/show_bug.cgi?id=71949
This commit is contained in:
Behdad Esfahbod 2013-11-25 17:50:07 -05:00
parent 9af91ca8ff
commit d2da5e0b4b
1 changed files with 1 additions and 1 deletions
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src/hb-ot-shape-complex-myanmar-machine.rl
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@ -70,7 +70,7 @@ c = C|Ra; # is_consonant
medial_group = MY? MR? ((MW MH? | MH) As?)?;
main_vowel_group = VPre* VAbv* VBlw* A* (DB As?)?;
post_vowel_group = VPst MH? As* VAbv* A* (DB As?)?;
pwo_tone_group = PT A* (DB As?)?;
pwo_tone_group = PT A* DB? As?;
complex_syllable_tail = As* medial_group main_vowel_group post_vowel_group* pwo_tone_group* V* j?;
syllable_tail = (H | complex_syllable_tail);