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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"
}
if not context then os.exit() end -- generic function in node-dum
local next, type = next, type
local concat = table.concat
local trace_characters = false trackers.register("nodes.characters", function(v) trace_characters = v end)
local trace_fontrun = false trackers.register("nodes.fontrun", function(v) trace_fontrun = v end)
local report_fonts = logs.reporter("fonts","processing")
local nodes, node = nodes, node
fonts = fonts or { }
fonts.tfm = fonts.tfm or { }
fonts.identifiers = fonts.identifiers or { }
local traverse_id = node.traverse_id
local has_attribute = node.has_attribute
local starttiming = statistics.starttiming
local stoptiming = statistics.stoptiming
local nodecodes = nodes.nodecodes
local fontdata = fonts.identifiers
local handlers = nodes.handlers
local glyph_code = nodecodes.glyph
-- 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
local run = 0
function handlers.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
if trace_fontrun then
run = run + 1
report_fonts()
report_fonts("checking node list, run %s",run)
report_fonts()
local n = head
while n do
if n.id == glyph_code then
local font, attr = n.font, has_attribute(n,0) or 0
report_fonts("font %03i, dynamic %03i, glyph %s",font,attr,utf.char(n.char))
else
report_fonts("[%s]",nodecodes[n.id])
end
n = n.next
end
end
for n in traverse_id(glyph_code,head) do
local font, attr = n.font, has_attribute(n,0) or 0 -- zero attribute is reserved for fonts in context
if font ~= prevfont or attr ~= prevattr then
if attr > 0 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.setdynamics(font,dynamics,attr)
if d then
used[attr] = d
a = a + 1
end
end
end
end
else
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
end
prevfont = font
prevattr = attr
end
end
if trace_fontrun then
report_fonts()
report_fonts("statics : %s",(u > 0 and concat(table.keys(usedfonts)," ")) or "none")
report_fonts("dynamics: %s",(a > 0 and concat(table.keys(attrfonts)," ")) or "none")
report_fonts()
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,0)
head = h or head
done = done or d
if n > 1 then
for i=2,n do
local h, d = processors[i](head,font,0)
head = h or head
done = 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,0)
head = h or head
done = done or d
if n > 1 then
for i=2,n do
local h, d = processors[i](head,font,0)
head = h or head
done = 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 = h or head
done = done or d
if n > 1 then
for i=2,n do
local h, d = processors[i](head,font,attribute)
head = h or head
done = 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 = h or head
done = done or d
if n > 1 then
for i=2,n do
local h, d = processors[i](head,font,attribute)
head = h or head
done = done or d
end
end
end
end
end
stoptiming(nodes)
if trace_characters then
nodes.report(head,done)
end
return head, true
end
handlers.protectglyphs = node.protect_glyphs
handlers.unprotectglyphs = node.unprotect_glyphs
|
