Data files

Three JSON files in data/ describe all 923 Sinhala letter forms. They share one id per form, so they join on it. Browse them in the letter explorer.

File	Built by	What
letters.json	tools/build_data.py	The inventory: text and code points of each form
validity.json	tools/build_data.py	Status of each form and the rules behind it
romanization-coverage.json	tools/check_romanization.py	The romanizations that produce each form, per option set

IDs

Kind	Count	ID	Example
Independent vowel	18	vowel.<vowel>	vowel.aa ආ
Sign	3	sign.<name>	sign.anusvara ං
Consonant form	41 × 19	<consonant>.<vowel>	ka.hal ක්, ka.a ක, ka.ru කෘ
Conjunct	41 × 3	<consonant>.<conjunct>	ka.yansaya ක්‍ය, ka.rakaransaya ක්‍ර, ka.repaya ර්‍ක

Vowel IDs: hal a aa ae aee i ii u uu ru ruu ilu iluu e ee ai o oo au. Consonant IDs follow 01 · Letter inventory, in Unicode order from ka ක to fa ෆ.

letters.json

{ "id": "ka.ru", "kind": "syllable", "text": "කෘ", "consonant": "ka", "vowel": "ru",
  "codepoints": ["U+0D9A", "U+0DD8"] }

kind is vowel, sign, syllable or conjunct. Conjuncts carry conjunct instead of vowel.

validity.json

{ "id": "ka.u", "text": "කු", "status": "valid", "shape": "hook-u", "rules": ["G-VS-13"] }

status	Count	Meaning
valid	380	In ordinary use
loan	193	Valid, but in practice only in Sanskrit or Pali (tatsama) words
rare	101	A valid encoding that is marginal or archaic in use
unattested	117	No known word uses it, but no rule forbids it
never	132	Forbidden by a hard rule (G-HC-06, G-HC-07, G-HC-08, G-HC-14, G-VS-08)

shape flags a glyph that is drawn specially. The encoding is unchanged (G-EN-11): hook-u, irregular (ර and ළ with u/uu, ර with ae/aee), tail-loss and alt-hal. It is null for the other 897 forms.

Consonant × vowel statuses come from the 41 × 17 table in 02 · Vowel signs §8. They are a synthesis of the sources, not a corpus count, except the ෘ / ෲ columns, which were checked against a 2.1M-word list (VS-035).

romanization-coverage.json

{ "id": "ka.repaya", "text": "ර්‍ක", "status": "valid",
  "default": [], "repaya_zwj": ["rka", "rca"], "classical": [], "archaic": [],
  "rakaransaya_u": [] }

Each option set lists up to four romanizations that produce the form, shortest first. Signs are written after ක (kax → කං), and letters that can't start a word are written after අ (azda → අඳ). An empty list means that option set can't produce the form. ZWJ repaya needs repaya_zwj, and archaic letters need archaic. All 791 forms that aren't never are producible under some option set.