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if not modules then modules = { } end modules ['font-gbn'] = {
version = 1.001,
comment = "companion to luatex-*.tex",
author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
copyright = "PRAGMA ADE / ConTeXt Development Team",
license = "see context related readme files"
}
-- generic [base|node] mode handler
if context then
texio.write_nl("fatal error: this module is not for context")
os.exit()
end
local fonts = fonts
local nodes = nodes
local nuts = nodes.nuts -- context abstraction of direct nodes
local traverse_id = nuts.traverse_id
local flush_node = nuts.flush_node
local glyph_code = nodes.nodecodes.glyph
local disc_code = nodes.nodecodes.disc
local tonode = nuts.tonode
local tonut = nuts.tonut
local getfont = nuts.getfont
local getchar = nuts.getchar
local getid = nuts.getid
local getboth = nuts.getboth
local getprev = nuts.getprev
local getnext = nuts.getnext
local getdisc = nuts.getdisc
local setchar = nuts.setchar
local setlink = nuts.setlink
local setprev = nuts.setprev
local nodetail = nuts.tail
-- from now on we apply ligaturing and kerning here because it might interfere with complex
-- opentype discretionary handling where the base ligature pass expect some weird extra
-- pointers (which then confuse the tail slider that has some checking built in)
local n_ligaturing = node.ligaturing
local n_kerning = node.kerning
local ligaturing = nuts.ligaturing
local kerning = nuts.kerning
local basemodepass = true
local function l_warning() texio.write_nl("warning: node.ligaturing called directly") l_warning = nil end
local function k_warning() texio.write_nl("warning: node.kerning called directly") k_warning = nil end
function node.ligaturing(...)
if basemodepass and l_warning then
l_warning()
end
return n_ligaturing(...)
end
function node.kerning(...)
if basemodepass and k_warning then
k_warning()
end
return n_kerning(...)
end
function nodes.handlers.setbasemodepass(v)
basemodepass = v
end
function nodes.handlers.nodepass(head)
local fontdata = fonts.hashes.identifiers
if fontdata then
local nuthead = tonut(head)
local usedfonts = { }
local basefonts = { }
local prevfont = nil
local basefont = nil
local variants = nil
local redundant = nil
for n in traverse_id(glyph_code,nuthead) do
local font = getfont(n)
if font ~= prevfont then
if basefont then
basefont[2] = getprev(n)
end
prevfont = font
local used = usedfonts[font]
if not used then
local tfmdata = fontdata[font] --
if tfmdata then
local shared = tfmdata.shared -- we need to check shared, only when same features
if shared then
local processors = shared.processes
if processors and #processors > 0 then
usedfonts[font] = processors
elseif basemodepass then
basefont = { n, nil }
basefonts[#basefonts+1] = basefont
end
end
local resources = tfmdata.resources
variants = resources and resources.variants
variants = variants and next(variants) and variants or false
end
else
local tfmdata = fontdata[prevfont]
if tfmdata then
local resources = tfmdata.resources
variants = resources and resources.variants
variants = variants and next(variants) and variants or false
end
end
end
if variants then
local char = getchar(n)
if char >= 0xFE00 and (char <= 0xFE0F or (char >= 0xE0100 and char <= 0xE01EF)) then
local hash = variants[char]
if hash then
local p = getprev(n)
if p and getid(p) == glyph_code then
local variant = hash[getchar(p)]
if variant then
setchar(p,variant)
end
end
end
-- per generic user request we always remove selectors
if not redundant then
redundant = { n }
else
redundant[#redundant+1] = n
end
end
end
end
local nofbasefonts = #basefonts
if redundant then
for i=1,#redundant do
local r = redundant[i]
local p, n = getboth(r)
if r == nuthead then
nuthead = n
setprev(n)
else
setlink(p,n)
end
if nofbasefonts > 0 then
for i=1,nofbasefonts do
local bi = basefonts[i]
if r == bi[1] then
bi[1] = n
end
if r == bi[2] then
bi[2] = n
end
end
end
flush_node(r)
end
end
for d in traverse_id(disc_code,nuthead) do
local _, _, r = getdisc(d)
if r then
for n in traverse_id(glyph_code,r) do
local font = getfont(n)
if font ~= prevfont then
prevfont = font
local used = usedfonts[font]
if not used then
local tfmdata = fontdata[font] --
if tfmdata then
local shared = tfmdata.shared -- we need to check shared, only when same features
if shared then
local processors = shared.processes
if processors and #processors > 0 then
usedfonts[font] = processors
end
end
end
end
end
end
end
end
if next(usedfonts) then
for font, processors in next, usedfonts do
for i=1,#processors do
head = processors[i](head,font,0) or head
end
end
end
if basemodepass and nofbasefonts > 0 then
for i=1,nofbasefonts do
local range = basefonts[i]
local start = range[1]
local stop = range[2]
if start then
local front = nuthead == start
if not stop then
stop = nodetail(start)
end
if stop then
start, stop = ligaturing(start,stop)
start, stop = kerning(start,stop)
elseif start then -- safeguard
start, stop = ligaturing(start,stop)
start, stop = kerning(start,stop)
end
if front and nuthead ~= start then
head = tonode(start)
end
end
end
end
return head, true
else
return head, false
end
end
function nodes.handlers.basepass(head)
if not basemodepass then
head = n_ligaturing(head)
head = n_kerning(head)
end
return head, true
end
local nodepass = nodes.handlers.nodepass
local basepass = nodes.handlers.basepass
local injectpass = nodes.injections.handler
local protectpass = nodes.handlers.protectglyphs
function nodes.simple_font_handler(head)
if head then
head = nodepass(head)
head = injectpass(head)
if not basemodepass then
head = basepass(head)
end
protectpass(head)
return head, true
else
return head, false
end
end
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