| Current File : //usr/share/texlive/texmf-dist/tex/luatex/luaotfload/fontloader-fonts-gbn.lua |
if not modules then modules = { } end modules ['luatex-fonts-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
os.exit()
end
local next = next
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
-- 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 d_ligaturing = nuts.ligaturing
local d_kerning = nuts.kerning
local basemodepass = true
local function l_warning() logs.report("fonts","don't call 'node.ligaturing' directly") l_warning = nil end
local function k_warning() logs.report("fonts","don't call 'node.kerning' 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 nuts.ligaturing(...)
if basemodepass and l_warning then
l_warning()
end
return d_ligaturing(...)
end
function nuts.kerning(...)
if basemodepass and k_warning then
k_warning()
end
return d_kerning(...)
end
-- direct.ligaturing = nuts.ligaturing
-- direct.kerning = nuts.kerning
function nodes.handlers.setbasemodepass(v)
basemodepass = v
end
local function nodepass(head,groupcode,size,packtype,direction)
local fontdata = fonts.hashes.identifiers
if fontdata then
local usedfonts = { }
local basefonts = { }
local prevfont = nil
local basefont = nil
local variants = nil
local redundant = nil
local nofused = 0
for n in traverse_id(glyph_code,head) 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
nofused = nofused + 1
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 == head then
head = 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,head) 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
nofused = nofused + 1
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,direction,nofused) 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 = head == start
local prev, next
if stop then
next = getnext(stop)
start, stop = d_ligaturing(start,stop)
start, stop = d_kerning(start,stop)
else
prev = getprev(start)
start = d_ligaturing(start)
start = d_kerning(start)
end
if prev then
setlink(prev,start)
end
if next then
setlink(stop,next)
end
if front and head ~= start then
head = start
end
end
end
end
end
return head
end
local function basepass(head)
if basemodepass then
head = d_ligaturing(head)
head = d_kerning(head)
end
return head
end
local protectpass = node.direct.protect_glyphs
local injectpass = nodes.injections.handler
-- This is the only official public interface and this one can be hooked into a callback (chain) and
-- everything else can change!@ Functione being visibel doesn't mean that it's part of the api.
function nodes.handlers.nodepass(head,...)
if head then
return tonode(nodepass(tonut(head),...))
end
end
function nodes.handlers.basepass(head)
if head then
return tonode(basepass(tonut(head)))
end
end
function nodes.handlers.injectpass(head)
if head then
return tonode(injectpass(tonut(head)))
end
end
function nodes.handlers.protectpass(head)
if head then
protectpass(tonut(head))
return head
end
end
function nodes.simple_font_handler(head,groupcode,size,packtype,direction)
if head then
head = tonut(head)
head = nodepass(head,groupcode,size,packtype,direction)
head = injectpass(head)
if not basemodepass then
head = basepass(head)
end
protectpass(head)
head = tonode(head)
end
return head
end