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if not modules then modules = { } end modules ['node-dum'] = {
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"
}
nodes = nodes or { }
fonts = fonts or { }
attributes = attributes or { }
local traverse_id = node.traverse_id
local free_node = node.free
local remove_node = node.remove
local new_node = node.new
local glyph = node.id('glyph')
-- fonts
local fontdata = fonts.ids or { }
function nodes.simple_font_handler(head)
-- lang.hyphenate(head)
head = nodes.process_characters(head)
nodes.inject_kerns(head)
nodes.protect_glyphs(head)
head = node.ligaturing(head)
head = node.kerning(head)
return head
end
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
nodes.protect_glyphs = node.protect_glyphs
nodes.unprotect_glyphs = node.unprotect_glyphs
function nodes.process_characters(head)
local usedfonts, done, prevfont = { }, false, nil
for n in traverse_id(glyph,head) do
local font = n.font
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
done = true
end
end
end
end
end
end
if done then
for font, processors in next, usedfonts do
for i=1,#processors do
local h, d = processors[i](head,font,0)
head, done = h or head, done or d
end
end
end
return head, true
end
-- helper
function nodes.kern(k)
local n = new_node("kern",1)
n.kern = k
return n
end
function nodes.remove(head, current, free_too)
local t = current
head, current = remove_node(head,current)
if t then
if free_too then
free_node(t)
t = nil
else
t.next, t.prev = nil, nil
end
end
return head, current, t
end
function nodes.delete(head,current)
return nodes.remove(head,current,true)
end
nodes.before = node.insert_before
nodes.after = node.insert_after
-- attributes
attributes.unsetvalue = -0x7FFFFFFF
local numbers, last = { }, 127
function attributes.private(name)
local number = numbers[name]
if not number then
if last < 255 then
last = last + 1
end
number = last
numbers[name] = number
end
return number
end
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