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-----------------------------------------------------------------------
-- FILE: luaotfload-suppress.lua
-- DESCRIPTION: part of luaotfload / suppress
-----------------------------------------------------------------------
assert(luaotfload_module, "This is a part of luaotfload and should not be loaded independently") {
name = "luaotfload-suppress",
version = "3.19", --TAGVERSION
date = "2022-02-24", --TAGDATE
description = "luaotfload submodule / suppress",
license = "GPL v2.0",
author = "Marcel Krüger"
}
local direct = node.direct
local otfregister = fonts.constructors.features.otf.register
local copy = direct.copy
local getdisc = direct.getdisc
local getnext = direct.getnext
local insert_after = direct.insert_after
local is_char = direct.is_char
local setchar = direct.setchar
local setdisc = direct.setdisc
local getfont = font.getfont
local disc_t = node.id'disc'
local empty = {}
local lpeg = lpeg or require'lpeg'
local valueparser do
local digits = lpeg.R'09'^1/tonumber
local hexdigits = (lpeg.P'u+' + '"' + '0x') * (lpeg.R('09', 'AF', 'af')^1/function(s) return tonumber(s, 16) end)
local entry = lpeg.Cg((hexdigits + digits) * lpeg.Cc(true))
local sep = lpeg.P' '^0 * lpeg.S'/|,;' * lpeg.P' '^0
valueparser = lpeg.Cf(lpeg.Ct'' * entry * (sep * entry)^0, rawset) * -1
end
local function initializer(tfmdata, value, features)
local properties = tfmdata.properties
properties.suppress_liga = valueparser:match(value)
if not properties.suppress_liga then
error[[Invalid suppress value]]
end
end
local function processor(head,font) -- ,attr,direction)
local supp = getfont(font).properties.suppress_liga
if not supp then return head end
local n = head
while n do
local c, id = is_char(n, font)
if supp[c] then
local nn = copy(n)
setchar(nn, 0x200C)
head, n = insert_after(head, n, nn)
elseif id == disc_t then
local pre, post, replace = getdisc(n)
pre = processor(pre, font)
post = processor(post, font)
replace = processor(replace, font)
setdisc(n, pre, post, replace)
end
n = getnext(n)
end
return head
end
otfregister {
name = 'suppress',
description = 'Insert ZWNJ to suppress ligatures',
default = false,
initializers = {
-- node = initializer,
plug = initializer,
},
processors = {
position = 1,
-- node = processor,
plug = processor,
},
}
--- vim:sw=2:ts=2:expandtab:tw=71
|
