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if not modules then modules = { } end modules ['font-cid'] = {
version = 1.001,
comment = "companion to font-otf.lua (cidmaps)",
author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
copyright = "PRAGMA ADE / ConTeXt Development Team",
license = "see context related readme files"
}
local format, match, lower = string.format, string.match, string.lower
local tonumber = tonumber
local lpegmatch = lpeg.match
local trace_loading = false trackers.register("otf.loading", function(v) trace_loading = v end)
local report_otf = logs.new("fonts","otf loading")
local fonts = fonts
fonts.cid = fonts.cid or { }
local cid = fonts.cid
cid.map = cid.map or { }
cid.max = cid.max or 10
-- original string parser: 0.109, lpeg parser: 0.036 seconds for Adobe-CNS1-4.cidmap
--
-- 18964 18964 (leader)
-- 0 /.notdef
-- 1..95 0020
-- 99 3000
local P, S, R, C = lpeg.P, lpeg.S, lpeg.R, lpeg.C
local number = C(R("09","af","AF")^1)
local space = S(" \n\r\t")
local spaces = space^0
local period = P(".")
local periods = period * period
local name = P("/") * C((1-space)^1)
local unicodes, names = { }, { }
local function do_one(a,b)
unicodes[tonumber(a)] = tonumber(b,16)
end
local function do_range(a,b,c)
c = tonumber(c,16)
for i=tonumber(a),tonumber(b) do
unicodes[i] = c
c = c + 1
end
end
local function do_name(a,b)
names[tonumber(a)] = b
end
local grammar = lpeg.P { "start",
start = number * spaces * number * lpeg.V("series"),
series = (spaces * (lpeg.V("one") + lpeg.V("range") + lpeg.V("named")) )^1,
one = (number * spaces * number) / do_one,
range = (number * periods * number * spaces * number) / do_range,
named = (number * spaces * name) / do_name
}
function cid.load(filename)
local data = io.loaddata(filename)
if data then
unicodes, names = { }, { }
lpegmatch(grammar,data)
local supplement, registry, ordering = match(filename,"^(.-)%-(.-)%-()%.(.-)$")
return {
supplement = supplement,
registry = registry,
ordering = ordering,
filename = filename,
unicodes = unicodes,
names = names
}
else
return nil
end
end
local template = "%s-%s-%s.cidmap"
local function locate(registry,ordering,supplement)
local filename = format(template,registry,ordering,supplement)
local hashname = lower(filename)
local cidmap = cid.map[hashname]
if not cidmap then
if trace_loading then
report_otf("checking cidmap, registry: %s, ordering: %s, supplement: %s, filename: %s",registry,ordering,supplement,filename)
end
local fullname = resolvers.findfile(filename,'cid') or ""
if fullname ~= "" then
cidmap = cid.load(fullname)
if cidmap then
if trace_loading then
report_otf("using cidmap file %s",filename)
end
cid.map[hashname] = cidmap
cidmap.usedname = file.basename(filename)
return cidmap
end
end
end
return cidmap
end
function cid.getmap(registry,ordering,supplement)
-- cf Arthur R. we can safely scan upwards since cids are downward compatible
local supplement = tonumber(supplement)
if trace_loading then
report_otf("needed cidmap, registry: %s, ordering: %s, supplement: %s",registry,ordering,supplement)
end
local cidmap = locate(registry,ordering,supplement)
if not cidmap then
local cidnum = nil
-- next highest (alternatively we could start high)
if supplement < cid.max then
for supplement=supplement+1,cid.max do
local c = locate(registry,ordering,supplement)
if c then
cidmap, cidnum = c, supplement
break
end
end
end
-- next lowest (least worse fit)
if not cidmap and supplement > 0 then
for supplement=supplement-1,0,-1 do
local c = locate(registry,ordering,supplement)
if c then
cidmap, cidnum = c, supplement
break
end
end
end
-- prevent further lookups
if cidmap and cidnum > 0 then
for s=0,cidnum-1 do
filename = format(template,registry,ordering,s)
if not cid.map[filename] then
cid.map[filename] = cidmap -- copy of ref
end
end
end
end
return cidmap
end
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