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if not modules then modules = { } end modules ['font-nod'] = {
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"
}
--[[ldx--
<p>This is rather experimental. We need more control and some of this
might become a runtime module instead. This module will be cleaned up!</p>
--ldx]]--
local tonumber, tostring = tonumber, tostring
local utfchar = utf.char
local concat = table.concat
local match, gmatch, concat, rep = string.match, string.gmatch, table.concat, string.rep
local report_nodes = logs.reporter("fonts","tracing")
fonts = fonts or { }
nodes = nodes or { }
local fonts, nodes, node, context = fonts, nodes, node, context
local tracers = nodes.tracers or { }
nodes.tracers = tracers
local tasks = nodes.tasks or { }
nodes.tasks = tasks
local handlers = nodes.handlers or { }
nodes.handlers = handlers
local injections = nodes.injections or { }
nodes.injections = injections
local char_tracers = tracers.characters or { }
tracers.characters = char_tracers
local step_tracers = tracers.steppers or { }
tracers.steppers = step_tracers
local copy_node_list = node.copy_list
local hpack_node_list = node.hpack
local free_node_list = node.flush_list
local traverse_nodes = node.traverse
local nodecodes = nodes.nodecodes
local whatcodes = nodes.whatcodes
local glyph_code = nodecodes.glyph
local hlist_code = nodecodes.hlist
local vlist_code = nodecodes.vlist
local disc_code = nodecodes.disc
local glue_code = nodecodes.glue
local kern_code = nodecodes.kern
local rule_code = nodecodes.rule
local whatsit_code = nodecodes.whatsit
local spec_code = nodecodes.glue_spec
local localpar_code = whatcodes.localpar
local dir_code = whatcodes.dir
local nodepool = nodes.pool
local new_glyph = nodepool.glyph
local formatters = string.formatters
local formatter = string.formatter
local hashes = fonts.hashes
local fontidentifiers = hashes.identifiers
local fontdescriptions = hashes.descriptions
local fontcharacters = hashes.characters
local fontproperties = hashes.properties
local fontparameters = hashes.parameters
function char_tracers.collect(head,list,tag,n)
n = n or 0
local ok, fn = false, nil
while head do
local id = head.id
if id == glyph_code then
local f = head.font
if f ~= fn then
ok, fn = false, f
end
local c = head.char
local i = fontidentifiers[f].indices[c] or 0
if not ok then
ok = true
n = n + 1
list[n] = list[n] or { }
list[n][tag] = { }
end
local l = list[n][tag]
l[#l+1] = { c, f, i }
elseif id == disc_code then
-- skip
else
ok = false
end
head = head.next
end
end
function char_tracers.equal(ta, tb)
if #ta ~= #tb then
return false
else
for i=1,#ta do
local a, b = ta[i], tb[i]
if a[1] ~= b[1] or a[2] ~= b[2] or a[3] ~= b[3] then
return false
end
end
end
return true
end
function char_tracers.string(t)
local tt = { }
for i=1,#t do
tt[i] = utfchar(t[i][1])
end
return concat(tt,"")
end
local f_unicode = formatters["%U"]
function char_tracers.unicodes(t,decimal)
local tt = { }
for i=1,#t do
local n = t[i][1]
if n == 0 then
tt[i] = "-"
elseif decimal then
tt[i] = n
else
tt[i] = f_unicode(n)
end
end
return concat(tt," ")
end
function char_tracers.indices(t,decimal)
local tt = { }
for i=1,#t do
local n = t[i][3]
if n == 0 then
tt[i] = "-"
elseif decimal then
tt[i] = n
else
tt[i] = f_unicode(n)
end
end
return concat(tt," ")
end
function char_tracers.start()
local npc = handlers.characters
local list = { }
function handlers.characters(head)
local n = #list
char_tracers.collect(head,list,'before',n)
local h, d = npc(head)
char_tracers.collect(head,list,'after',n)
if #list > n then
list[#list+1] = { }
end
return h, d
end
function char_tracers.stop()
tracers.list['characters'] = list
local variables = {
['title'] = 'ConTeXt Character Processing Information',
['color-background-one'] = lmx.get('color-background-yellow'),
['color-background-two'] = lmx.get('color-background-purple'),
}
lmx.show('context-characters.lmx',variables)
handlers.characters = npc
tasks.restart("processors", "characters")
end
tasks.restart("processors", "characters")
end
local stack = { }
function tracers.start(tag)
stack[#stack+1] = tag
local tracer = tracers[tag]
if tracer and tracer.start then
tracer.start()
end
end
function tracers.stop()
local tracer = stack[#stack]
if tracer and tracer.stop then
tracer.stop()
end
stack[#stack] = nil
end
-- experimental
local collection, collecting, messages = { }, false, { }
function step_tracers.start()
collecting = true
end
function step_tracers.stop()
collecting = false
end
function step_tracers.reset()
for i=1,#collection do
local c = collection[i]
if c then
free_node_list(c)
end
end
collection, messages = { }, { }
end
function step_tracers.nofsteps()
return context(#collection)
end
function step_tracers.glyphs(n,i)
local c = collection[i]
if c then
tex.box[n] = hpack_node_list(copy_node_list(c))
end
end
function step_tracers.features()
-- we cannot use first_glyph here as it only finds characters with subtype < 256
local f = collection[1]
while f do
if f.id == glyph_code then
local tfmdata, t = fontidentifiers[f.font], { }
for feature, value in table.sortedhash(tfmdata.shared.features) do
if feature == "number" or feature == "features" then
-- private
elseif type(value) == "boolean" then
if value then
t[#t+1] = formatters["%s=yes"](feature)
else
-- skip
end
else
t[#t+1] = formatters["%s=%s"](feature,value)
end
end
if #t > 0 then
context(concat(t,", "))
else
context("no features")
end
return
end
f = f.next
end
end
function tracers.fontchar(font,char)
local n = new_glyph()
n.font, n.char, n.subtype = font, char, 256
context(n)
end
function step_tracers.font(command)
local c = collection[1]
while c do
local id = c.id
if id == glyph_code then
local font = c.font
local name = file.basename(fontproperties[font].filename or "unknown")
local size = fontparameters[font].size or 0
if command then
context[command](font,name,size) -- size in sp
else
context("[%s: %s @ %p]",font,name,size)
end
return
else
c = c.next
end
end
end
function step_tracers.codes(i,command)
local c = collection[i]
while c do
local id = c.id
if id == glyph_code then
if command then
local f, c = c.font,c.char
local d = fontdescriptions[f]
local d = d and d[c]
context[command](f,c,d and d.class or "")
else
context("[%s:U+%04X]",c.font,c.char)
end
elseif id == whatsit_code and (c.subtype == localpar_code or c.subtype == dir_code) then
context("[%s]",c.dir)
else
context("[%s]",nodecodes[id])
end
c = c.next
end
end
function step_tracers.messages(i,command,split)
local list = messages[i] -- or { "no messages" }
if list then
for i=1,#list do
local l = list[i]
if not command then
context("(%s)",l)
elseif split then
local a, b = match(l,"^(.-)%s*:%s*(.*)$")
context[command](a or l or "",b or "")
else
context[command](l)
end
end
end
end
-- hooks into the node list processor (see otf)
function step_tracers.check(head)
if collecting then
step_tracers.reset()
local n = copy_node_list(head)
injections.handler(n,nil,"trace",true)
handlers.protectglyphs(n) -- can be option
collection[1] = n
end
end
function step_tracers.register(head)
if collecting then
local nc = #collection+1
if messages[nc] then
local n = copy_node_list(head)
injections.handler(n,nil,"trace",true)
handlers.protectglyphs(n) -- can be option
collection[nc] = n
end
end
end
function step_tracers.message(str,...)
str = formatter(str,...)
if collecting then
local n = #collection + 1
local m = messages[n]
if not m then m = { } messages[n] = m end
m[#m+1] = str
end
return str -- saves an intermediate var in the caller
end
--
local threshold = 65536
local function toutf(list,result,nofresult,stopcriterium)
if list then
for n in traverse_nodes(list) do
local id = n.id
if id == glyph_code then
local components = n.components
if components then
result, nofresult = toutf(components,result,nofresult)
else
local c = n.char
local fc = fontcharacters[n.font]
if fc then
local u = fc[c].tounicode
if u then
for s in gmatch(u,"....") do
nofresult = nofresult + 1
result[nofresult] = utfchar(tonumber(s,16))
end
else
nofresult = nofresult + 1
result[nofresult] = utfchar(c)
end
else
nofresult = nofresult + 1
result[nofresult] = utfchar(c)
end
end
elseif id == disc_code then
result, nofresult = toutf(n.replace,result,nofresult) -- needed?
elseif id == hlist_code or id == vlist_code then
-- if nofresult > 0 and result[nofresult] ~= " " then
-- nofresult = nofresult + 1
-- result[nofresult] = " "
-- end
result, nofresult = toutf(n.list,result,nofresult)
elseif id == glue_code then
if nofresult > 0 and result[nofresult] ~= " " then
nofresult = nofresult + 1
result[nofresult] = " "
end
elseif id == kern_code and n.kern > threshold then
if nofresult > 0 and result[nofresult] ~= " " then
nofresult = nofresult + 1
result[nofresult] = " "
end
end
if n == stopcriterium then
break
end
end
end
if nofresult > 0 and result[nofresult] == " " then
result[nofresult] = nil
nofresult = nofresult - 1
end
return result, nofresult
end
function nodes.toutf(list,stopcriterium)
local result, nofresult = toutf(list,{},0,stopcriterium)
return concat(result)
end
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