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[USE] Document customizations of USE categories

This commit is contained in:
David Corbett 2021-10-08 13:25:46 -04:00
parent 7287125c58
commit bb50aae9b4
1 changed files with 4 additions and 0 deletions
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4
src/gen-use-table.py
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@ -247,6 +247,7 @@ def is_BASE_OTHER(U, UISC, UDI, UGC, AJT):
if UISC == Consonant_Placeholder: return True
return U in [0x2015, 0x2022, 0x25FB, 0x25FC, 0x25FD, 0x25FE]
def is_CGJ(U, UISC, UDI, UGC, AJT):
# Also includes VARIATION_SELECTOR, WJ, and ZWJ
return U == 0x200D or UDI and UGC in [Mc, Me, Mn]
def is_CONS_FINAL(U, UISC, UDI, UGC, AJT):
return ((UISC == Consonant_Final and UGC != Lo) or
@ -269,6 +270,7 @@ def is_HALANT(U, UISC, UDI, UGC, AJT):
and not is_HALANT_OR_VOWEL_MODIFIER(U, UISC, UDI, UGC, AJT)
and not is_SAKOT(U, UISC, UDI, UGC, AJT))
def is_HALANT_OR_VOWEL_MODIFIER(U, UISC, UDI, UGC, AJT):
# Split off of HALANT
# https://github.com/harfbuzz/harfbuzz/issues/1102
# https://github.com/harfbuzz/harfbuzz/issues/1379
return U in [0x11046, 0x1134D]
@ -285,6 +287,7 @@ def is_HIEROGLYPH_SEGMENT_END(U, UISC, UDI, UGC, AJT):
def is_ZWNJ(U, UISC, UDI, UGC, AJT):
return UISC == Non_Joiner
def is_OTHER(U, UISC, UDI, UGC, AJT):
# Also includes BASE_IND, Rsv, and SYM
return ((UGC in [Cn, Po] or UISC in [Consonant_Dead, Joiner, Modifying_Letter, Other])
and not is_BASE(U, UISC, UDI, UGC, AJT)
and not is_BASE_OTHER(U, UISC, UDI, UGC, AJT)
@ -294,6 +297,7 @@ def is_OTHER(U, UISC, UDI, UGC, AJT):
def is_REPHA(U, UISC, UDI, UGC, AJT):
return UISC in [Consonant_Preceding_Repha, Consonant_Prefixed]
def is_SAKOT(U, UISC, UDI, UGC, AJT):
# Split off of HALANT
return U == 0x1A60
def is_SYM_MOD(U, UISC, UDI, UGC, AJT):
return U in [0x1B6B, 0x1B6C, 0x1B6D, 0x1B6E, 0x1B6F, 0x1B70, 0x1B71, 0x1B72, 0x1B73]