On Mon, 23 Feb 2015 17:59:44 -0800 Roozbeh Pournader <[email protected]> wrote:
> Richard, > > I am working on a new update of InSC for Unicode 8.0, which is > available at https://github.com/roozbehp/unicode-data. > > After that, we'll push that into HarfBuzz. > > It would be best if you suggest updates to the Unicode property > instead, including potentially subdividing a property value. In this > way, users of all implementations (including Microsoft's Universal > Shaping Engine) would benefit. Are we still left with IndicSyllabicCategory.txt as the only functional definition of the properties? I have a few real questions affecting the categorisation of U+1A55 TAI THAM CONSONANT SIGN MEDIAL RA and U+1A56 TAI THAM CONSONANT SIGN MEDIAL LA. 1. Is <consonant><dependent_vowel>_<dependent_vowel> an allowed context for a 'Consonant_Medial' if it is allowed for an invisible stacker plus consonant? 2. Is <consonant><dependent_vowel>_# an allowed context for a 'Consonant_Medial' if it is allowed for an invisible stacker plus consonant? 3. Are they allowed contexts for 'Consonant_Subjoined' if they are allowed for an invisible stacker plus consonant? HarfBuzz has very liberal rules for the ordering of the constituents of a Tai Tham syllable once one views the invisible stacker as a control character to convert a character to 'consonant subjoined'. I'm not sure that the Universal Shaping Engine will - I am eagerly awaiting its publication. Correction: I checked as I wrote and see that the USE specification was released yesterday. If the blog page is correct, the Universal Shaping Engine rejects the phonetic ordering of the Tai Tham encoding model. The word /pɛːt/ 'eight' must be encoded <PA, SAKOT, DA, SIGN AE>! I shall be studying the specification today. At first sight the USE appears to reject the current encoding system. An important question for U+1A7A, U+1A7B and U+1A7C is: 4. May a 'syllable modifier' be followed by something other than a syllable modifier? The description implies not, which reduces the useful of what could have been a useful waste bin taxon, sweeping up all the pure killers. > Please take a look and send me or UTC your suggestions (or file bugs > at https://github.com/roozbehp/unicode-data/issues). If there was > still a need to change something in HarfBuzz, we can do that too. By 'sending to the UTC', are you suggesting anything more than a bug report or document submission? Richard. _______________________________________________ HarfBuzz mailing list [email protected] http://lists.freedesktop.org/mailman/listinfo/harfbuzz
