| Commit message (Collapse) | Author | Age | Files | Lines |
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UAX #14 line breaking (LB1-LB31, numbers tailored as Unicode's tests
are) and UAX #29's grapheme cluster, word and sentence boundaries, each
from generated property tables, the rules taken in order, in linear time.
They pass all of Unicode 15.1's LineBreakTest (10,274 cases),
GraphemeBreakTest (1,187), WordBreakTest (1,826) and SentenceBreakTest
(512).
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The build tool compiles a font's shaping plans the way HarfBuzz's planner
does (features, stages, masks, lookups per script and direction) and
carries them with the font's character map, advances and GDEF, GSUB and
GPOS tables in a section of the symbol file (VEGASYM4); glyphs shaping
reaches become symbols of their own. A small engine ports HarfBuzz 10's
default, Arabic and Hebrew shaping step for step and reads the tables in
place, every read bounds-checked. The build refuses a file whose shaping
differs from HarfBuzz's on random runs: DejaVu Sans agrees on 600,000
runs in six scripts both ways, and every installed font the tool accepts
agrees too, at 1.05-1.18 times HarfBuzz's time.
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Joining types, general categories and scripts (with their ISO 15924
codes) as two-stage tables, canonical decompositions one step at a time,
and Extended_Pictographic, from the UCD by text/unicode.py.
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