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if not modules then modules = { } end modules ['node-fnt'] = {
version = 1.001,
comment = "companion to font-ini.mkiv",
author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
copyright = "PRAGMA ADE / ConTeXt Development Team",
license = "see context related readme files"
}
local next, type = next, type
local trace_characters = false trackers.register("nodes.characters", function(v) trace_characters = v end)
local glyph = node.id('glyph')
local traverse_id = node.traverse_id
local has_attribute = node.has_attribute
local starttiming, stoptiming = statistics.starttiming, statistics.stoptiming
fonts = fonts or { }
fonts.tfm = fonts.tfm or { }
fonts.ids = fonts.ids or { }
local fontdata = fonts.ids
-- some tests with using an array of dynamics[id] and processes[id] demonstrated
-- that there was nothing to gain (unless we also optimize other parts)
--
-- maybe getting rid of the intermediate shared can save some time
-- potential speedup: check for subtype < 256 so that we can remove that test
-- elsewhere, danger: injected nodes will not be dealt with but that does not
-- happen often; we could consider processing sublists but that might need mor
-- checking later on; the current approach also permits variants
if tex.attribute[0] < 0 then
texio.write_nl("log","!")
texio.write_nl("log","! Attribute 0 is reserved for ConTeXt's font feature management and has to be")
texio.write_nl("log","! set to zero. Also, some attributes in the range 1-255 are used for special")
texio.write_nl("log","! purposed so setting them at the TeX end might break the font handler.")
texio.write_nl("log","!")
tex.attribute[0] = 0 -- else no features
end
function nodes.process_characters(head)
-- either next or not, but definitely no already processed list
starttiming(nodes)
local usedfonts, attrfonts, done = { }, { }, false
local a, u, prevfont, prevattr = 0, 0, nil, 0
for n in traverse_id(glyph,head) do
local font, attr = n.font, has_attribute(n,0) -- zero attribute is reserved for fonts in context
if attr and attr > 0 then
if font ~= prevfont or attr ~= prevattr then
local used = attrfonts[font]
if not used then
used = { }
attrfonts[font] = used
end
if not used[attr] then
-- we do some testing outside the function
local tfmdata = fontdata[font]
local shared = tfmdata.shared
if shared then
local dynamics = shared.dynamics
if dynamics then
local d = shared.set_dynamics(font,dynamics,attr) -- still valid?
if d then
used[attr] = d
a = a + 1
end
end
end
end
prevfont, prevattr = font, attr
end
elseif font ~= prevfont then
prevfont, prevattr = font, 0
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
u = u + 1
end
end
else
-- probably nullfont
end
end
else
prevattr = attr
end
end
-- we could combine these and just make the attribute nil
if u == 1 then
local font, processors = next(usedfonts)
local n = #processors
if n > 0 then
local h, d = processors[1](head,font,false)
head, done = h or head, done or d
if n > 1 then
for i=2,n do
local h, d = processors[i](head,font,false)
head, done = h or head, done or d
end
end
end
elseif u > 0 then
for font, processors in next, usedfonts do
local n = #processors
local h, d = processors[1](head,font,false)
head, done = h or head, done or d
if n > 1 then
for i=2,n do
local h, d = processors[i](head,font,false)
head, done = h or head, done or d
end
end
end
end
if a == 1 then
local font, dynamics = next(attrfonts)
for attribute, processors in next, dynamics do -- attr can switch in between
local n = #processors
local h, d = processors[1](head,font,attribute)
head, done = h or head, done or d
if n > 1 then
for i=2,n do
local h, d = processors[i](head,font,attribute)
head, done = h or head, done or d
end
end
end
elseif a > 0 then
for font, dynamics in next, attrfonts do
for attribute, processors in next, dynamics do -- attr can switch in between
local n = #processors
local h, d = processors[1](head,font,attribute)
head, done = h or head, done or d
if n > 1 then
for i=2,n do
local h, d = processors[i](head,font,attribute)
head, done = h or head, done or d
end
end
end
end
end
stoptiming(nodes)
if trace_characters then
nodes.report(head,done)
end
return head, true
end
if node.protect_glyphs then
nodes.protect_glyphs = node.protect_glyphs
nodes.unprotect_glyphs = node.unprotect_glyphs
else do
-- initial value subtype : X000 0001 = 1 = 0x01 = char
--
-- expected before linebreak : X000 0000 = 0 = 0x00 = glyph
-- X000 0010 = 2 = 0x02 = ligature
-- X000 0100 = 4 = 0x04 = ghost
-- X000 1010 = 10 = 0x0A = leftboundary lig
-- X001 0010 = 18 = 0x12 = rightboundary lig
-- X001 1010 = 26 = 0x1A = both boundaries lig
-- X000 1100 = 12 = 0x1C = leftghost
-- X001 0100 = 20 = 0x14 = rightghost
function nodes.protect_glyphs(head)
local done = false
for g in traverse_id(glyph,head) do
local s = g.subtype
if s == 1 then
done, g.subtype = true, 256
elseif s <= 256 then
done, g.subtype = true, 256 + s
end
end
return done
end
function nodes.unprotect_glyphs(head)
local done = false
for g in traverse_id(glyph,head) do
local s = g.subtype
if s > 256 then
done, g.subtype = true, s - 256
end
end
return done
end
end end
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