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|
if not modules then modules = { } end modules ['font-col'] = {
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"
}
-- possible optimization: delayed initialization of vectors
local gmatch, type = string.gmatch, type
local traverse_id = node.traverse_id
local lpegmatch = lpeg.match
local fastcopy = table.fastcopy
local settings_to_hash = utilities.parsers.settings_to_hash
local trace_collecting = false trackers.register("fonts.collecting", function(v) trace_collecting = v end)
local report_fonts = logs.reporter("fonts","collections")
local fonts, context = fonts, context
fonts.collections = fonts.collections or { }
local collections = fonts.collections
collections.definitions = collections.definitions or { }
local definitions = collections.definitions
collections.vectors = collections.vectors or { }
local vectors = collections.vectors
local fontdata = fonts.hashes.identifiers
local glyph = node.id('glyph')
local list, current, active = { }, 0, false
-- maybe also a copy
function collections.reset(name,font)
if font and font ~= "" then
local d = definitions[name]
if d then
d[font] = nil
if not next(d) then
definitions[name] = nil
end
end
else
definitions[name] = nil
end
end
function collections.define(name,font,ranges,details)
-- todo: details -> method=force|conditional rscale=
-- todo: remap=name
local d = definitions[name]
if d then
if name and trace_collecting then
report_fonts("def: extending set %s using %s",name, font)
end
else
if name and trace_collecting then
report_fonts("def: defining set %s using %s",name, font)
end
d = { }
definitions[name] = d
end
details = settings_to_hash(details)
-- todo, combine per font start/stop as arrays
for s in gmatch(ranges,"[^, ]+") do
local start, stop, description = characters.getrange(s)
if start and stop then
if trace_collecting then
if description then
report_fonts("def: using range %s (U+%05x-U+%05X, %s)",s,start,stop,description)
end
for i=1,#d do
local di = d[i]
if (start >= di.start and start <= di.stop) or (stop >= di.start and stop <= di.stop) then
report_fonts("def: overlapping ranges U+%05x-U+%05X and U+%05x-U+%05X",start,stop,di.start,di.stop)
end
end
end
details.font, details.start, details.stop = font, start, stop
d[#d+1] = fastcopy(details)
end
end
end
-- todo: provide a lua variant (like with definefont)
function collections.registermain(name)
local last = font.current()
if trace_collecting then
report_fonts("def: registering font %s with name %s",last,name)
end
list[#list+1] = last
end
function collections.clonevector(name)
statistics.starttiming(fonts)
local d = definitions[name]
local t = { }
if trace_collecting then
report_fonts("def: process collection %s",name)
end
for i=1,#d do
local f = d[i]
local id = list[i]
local start, stop = f.start, f.stop
if trace_collecting then
report_fonts("def: remapping font %s to %s for range U+%05X - U+%05X",current,id,start,stop)
end
local check = toboolean(f.check or "false",true)
local force = toboolean(f.force or "true",true)
local remap = f.remap or nil
-- check: when true, only set when present in font
-- force: when false, then not set when already set
local oldchars = fontdata[current].characters
local newchars = fontdata[id].characters
if check then
for i=start,stop do
if newchars[i] and (force or (not t[i] and not oldchars[i])) then
if remap then
t[i] = { id, remap[i] }
else
t[i] = id
end
end
end
else
for i=start,stop do
if force or (not t[i] and not oldchars[i]) then
if remap then
t[i] = { id, remap[i] }
else
t[i] = id
end
end
end
end
end
vectors[current] = t
if trace_collecting then
report_fonts("def: activating collection %s for font %s",name,current)
end
active = true
statistics.stoptiming(fonts)
end
-- we already have this parser
local P, Cc = lpeg.P, lpeg.Cc
local spec = (P("sa") + P("at") + P("scaled") + P("at") + P("mo")) * P(" ")^1 * (1-P(" "))^1 * P(" ")^0 * -1
local okay = ((1-spec)^1 * spec * Cc(true)) + Cc(false)
-- todo: check for already done
function collections.prepare(name)
current = font.current()
if vectors[current] then
return
end
local d = definitions[name]
if d then
if trace_collecting then
local filename = file.basename(fontdata[current].properties.filename or "?")
report_fonts("def: applying collection %s to %s (file: %s)",name,current,filename)
end
list = { }
context.pushcatcodes("prt") -- context.unprotect()
context.font_fallbacks_start_cloning()
for i=1,#d do
local f = d[i]
local name = f.font
local scale = f.rscale or 1
if lpegmatch(okay,name) then
context.font_fallbacks_clone_unique(name,scale)
else
context.font_fallbacks_clone_inherited(name,scale)
end
context.font_fallbacks_register_main(name)
end
context.font_fallbacks_prepare_clone_vectors(name)
context.font_fallbacks_stop_cloning()
context.popcatcodes() -- context.protect()
elseif trace_collecting then
local filename = file.basename(fontdata[current].properties.filename or "?")
report_fonts("def: error in applying collection %s to %s (file: %s)",name,current,filename)
end
end
function collections.report(message)
if trace_collecting then
report_fonts("tex: %s",message)
end
end
function collections.process(head) -- this way we keep feature processing
if active then
local done = false
for n in traverse_id(glyph,head) do
local v = vectors[n.font]
if v then
local id = v[n.char]
if id then
if type(id) == "table" then
local newid, newchar = id[1], id[2]
if trace_collecting then
report_fonts("lst: remapping character %s in font %s to character %s in font %s",n.char,n.font,newchar,newid)
end
n.font, n.char = newid, newchar
else
if trace_collecting then
report_fonts("lst: remapping font %s to %s for character %s",n.font,id,n.char)
end
n.font = id
end
end
end
end
return head, done
else
return head, false
end
end
-- interface
commands.fontcollectiondefine = collections.define
commands.fontcollectionreset = collections.reset
commands.fontcollectionprepare = collections.prepare
commands.fontcollectionreport = collections.report
commands.fontcollectionregister = collections.registermain
commands.fontcollectionclone = collections.clonevector
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