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|
if not modules then modules = { } end modules ['good-ctx'] = {
version = 1.000,
comment = "companion to font-lib.mkiv",
author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
copyright = "PRAGMA ADE / ConTeXt Development Team",
license = "see context related readme files"
}
-- depends on ctx
local type, next, tonumber = type, next, tonumber
local find, splitup = string.find, string.splitup
local fonts = fonts
local nodes = nodes
local attributes = attributes
----- trace_goodies = false trackers.register("fonts.goodies", function(v) trace_goodies = v end)
----- report_goodies = logs.reporter("fonts","goodies")
local allocate = utilities.storage.allocate
local setmetatableindex = table.setmetatableindex
local implement = interfaces.implement
local registerotffeature = fonts.handlers.otf.features.register
----- registerafmfeature = fonts.handlers.afm.features.register
----- registertfmfeature = fonts.handlers.tfm.features.register
local fontgoodies = fonts.goodies or { }
local glyph_code = nodes.nodecodes.glyph
local nuts = nodes.nuts
local tonut = nuts.tonut
local getfont = nuts.getfont
local getchar = nuts.getchar
local getattr = nuts.getattr
local traverse_id = nuts.traverse_id
-- colorschemes
local colorschemes = fontgoodies.colorschemes or allocate { }
fontgoodies.colorschemes = colorschemes
colorschemes.data = colorschemes.data or { }
local privatestoo = true
local function setcolorscheme(tfmdata,scheme)
if type(scheme) == "string" then
local goodies = tfmdata.goodies
-- todo : check for already defined in shared
if goodies then
local what
for i=1,#goodies do
-- last one counts
local g = goodies[i]
what = g.colorschemes and g.colorschemes[scheme] or what
end
if type(what) == "table" then
-- this is font bound but we can share them if needed
-- just as we could hash the conversions (per font)
local hash = tfmdata.resources.unicodes
local reverse = { }
local characters = tfmdata.characters
for i=1,#what do
local w = what[i]
for j=1,#w do
local name = w[j]
local kind = type(name)
if name == "*" then
-- inefficient but only used for tracing anyway
for _, unicode in next, hash do
reverse[unicode] = i
end
elseif kind == "number" then
reverse[name] = i
elseif kind ~= "string" then
-- ignore invalid entries
elseif find(name,":",1,true) then
local start, stop = splitup(name,":")
start = tonumber(start)
stop = tonumber(stop)
if start and stop then
-- limited usage: we only deal with non reassigned
-- maybe some day I'll also support the ones with a
-- tounicode in this range
for unicode=start,stop do
if characters[unicode] then
reverse[unicode] = i
end
end
end
else
local unicode = hash[name]
if unicode then
reverse[unicode] = i
end
end
end
end
if privatestoo then
local private = fonts.constructors.privateoffset
local descriptions = tfmdata.descriptions
for unicode, data in next, characters do
if unicode >= private then
if not reverse[unicode] then
local d = descriptions[unicode]
if d then
local u = d.unicode
if u then
local r = reverse[u] -- also catches tables
if r then
reverse[unicode] = r
end
end
end
end
end
end
end
tfmdata.properties.colorscheme = reverse
return
end
end
end
tfmdata.properties.colorscheme = false
end
local fontproperties = fonts.hashes.properties
local a_colorscheme = attributes.private('colorscheme')
local setnodecolor = nodes.tracers.colors.set
-- function colorschemes.coloring(head)
-- local lastfont, lastscheme
-- local done = false
-- for n in traverse_id(glyph_code,tonut(head)) do
-- local a = getattr(n,a_colorscheme)
-- if a then
-- local f = getfont(n)
-- if f ~= lastfont then
-- lastscheme = fontproperties[f].colorscheme
-- lastfont = f
-- end
-- if lastscheme then
-- local sc = lastscheme[getchar(n)]
-- if sc then
-- done = true
-- setnodecolor(n,"colorscheme:"..a..":"..sc) -- slow
-- end
-- end
-- end
-- end
-- return head, done
-- end
-- seldom used, mostly in manuals, so non critical .. anyhow, somewhat faster:
-- function colorschemes.coloring(head)
-- local lastfont = nil
-- local lastattr = nil
-- local lastscheme = nil
-- local lastprefix = nil
-- local done = nil
-- for n in traverse_id(glyph_code,tonut(head)) do
-- local a = getattr(n,a_colorscheme)
-- if a then
-- if a ~= lastattr then
-- lastattr = a
-- lastprefix = "colorscheme:" .. a .. ":"
-- end
-- local f = getfont(n)
-- if f ~= lastfont then
-- lastfont = f
-- lastscheme = fontproperties[f].colorscheme
-- end
-- if lastscheme then
-- local sc = lastscheme[getchar(n)]
-- if sc then
-- setnodecolor(n,lastprefix .. sc) -- slow
-- done = true
-- end
-- end
-- end
-- end
-- return head, done
-- end
-- ok, in case we have hundreds of pages colored:
local cache = { } -- this could be a weak table
setmetatableindex(cache,function(t,a)
local v = { }
setmetatableindex(v,function(t,c)
local v = "colorscheme:" .. a .. ":" .. c
t[c] = v
return v
end)
t[a]= v
return v
end)
function colorschemes.coloring(head)
local lastfont = nil
local lastattr = nil
local lastcache = nil
local lastscheme = nil
local done = nil
for n in traverse_id(glyph_code,tonut(head)) do
local a = getattr(n,a_colorscheme)
if a then
local f = getfont(n)
if f ~= lastfont then
lastfont = f
lastscheme = fontproperties[f].colorscheme
end
if a ~= lastattr then
lastattr = a
lastcache = cache[a]
end
if lastscheme then
local sc = lastscheme[getchar(n)]
if sc then
setnodecolor(n,lastcache[sc]) -- we could inline this one
done = true
end
end
end
end
return head, done
end
function colorschemes.enable()
nodes.tasks.appendaction("processors","fonts","fonts.goodies.colorschemes.coloring")
function colorschemes.enable() end
end
registerotffeature {
name = "colorscheme",
description = "goodie color scheme",
initializers = {
base = setcolorscheme,
node = setcolorscheme,
}
}
-- kern hackery:
--
-- yes : use goodies table
-- auto : assume features to be set (often ccmp only)
local function setkeepligatures(tfmdata)
if not tfmdata.properties.keptligatures then
local goodies = tfmdata.goodies
if goodies then
for i=1,#goodies do
local g = goodies[i]
local letterspacing = g.letterspacing
if letterspacing then
local keptligatures = letterspacing.keptligatures
if keptligatures then
local unicodes = tfmdata.resources.unicodes -- so we accept names
local hash = { }
for k, v in next, keptligatures do
local u = unicodes[k]
if u then
hash[u] = true
else
-- error: unknown name
end
end
tfmdata.properties.keptligatures = hash
end
end
end
end
end
end
registerotffeature {
name = "keepligatures",
description = "keep ligatures in letterspacing",
initializers = {
base = setkeepligatures,
node = setkeepligatures,
}
}
if implement then
implement {
name = "enablefontcolorschemes",
onlyonce = true,
actions = colorschemes.enable,
overload = true, -- for now, permits new font loader
}
end
|
