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if not modules then modules = { } end modules ['font-map'] = {
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"
}
local tonumber = tonumber
local match, format, find, concat, gsub, lower = string.match, string.format, string.find, table.concat, string.gsub, string.lower
local P, R, S, C, Ct, Cc, lpegmatch = lpeg.P, lpeg.R, lpeg.S, lpeg.C, lpeg.Ct, lpeg.Cc, lpeg.match
local utfbyte = utf.byte
local floor = math.floor
local trace_loading = false trackers.register("fonts.loading", function(v) trace_loading = v end)
local trace_mapping = false trackers.register("fonts.mapping", function(v) trace_unimapping = v end)
local report_fonts = logs.reporter("fonts","loading") -- not otf only
local fonts = fonts or { }
local mappings = fonts.mappings or { }
fonts.mappings = mappings
--[[ldx--
<p>Eventually this code will disappear because map files are kind
of obsolete. Some code may move to runtime or auxiliary modules.</p>
<p>The name to unciode related code will stay of course.</p>
--ldx]]--
local function loadlumtable(filename) -- will move to font goodies
local lumname = file.replacesuffix(file.basename(filename),"lum")
local lumfile = resolvers.findfile(lumname,"map") or ""
if lumfile ~= "" and lfs.isfile(lumfile) then
if trace_loading or trace_mapping then
report_fonts("loading map table %a",lumfile)
end
lumunic = dofile(lumfile)
return lumunic, lumfile
end
end
local hex = R("AF","09")
local hexfour = (hex*hex*hex*hex) / function(s) return tonumber(s,16) end
local hexsix = (hex*hex*hex*hex*hex*hex) / function(s) return tonumber(s,16) end
local dec = (R("09")^1) / tonumber
local period = P(".")
local unicode = P("uni") * (hexfour * (period + P(-1)) * Cc(false) + Ct(hexfour^1) * Cc(true))
local ucode = P("u") * (hexsix * (period + P(-1)) * Cc(false) + Ct(hexsix ^1) * Cc(true))
local index = P("index") * dec * Cc(false)
local parser = unicode + ucode + index
local parsers = { }
local function makenameparser(str)
if not str or str == "" then
return parser
else
local p = parsers[str]
if not p then
p = P(str) * period * dec * Cc(false)
parsers[str] = p
end
return p
end
end
local function tounicode16(unicode,name)
if unicode < 0x10000 then
return format("%04X",unicode)
elseif unicode < 0x1FFFFFFFFF then
return format("%04X%04X",floor(unicode/1024),unicode%1024+0xDC00)
else
report_fonts("can't convert %a in %a into tounicode",unicode,name)
end
end
local function tounicode16sequence(unicodes,name)
local t = { }
for l=1,#unicodes do
local unicode = unicodes[l]
if unicode < 0x10000 then
t[l] = format("%04X",unicode)
elseif unicode < 0x1FFFFFFFFF then
t[l] = format("%04X%04X",floor(unicode/1024),unicode%1024+0xDC00)
else
report_fonts ("can't convert %a in %a into tounicode",unicode,name)
end
end
return concat(t)
end
local function fromunicode16(str)
if #str == 4 then
return tonumber(str,16)
else
local l, r = match(str,"(....)(....)")
return (tonumber(l,16))*0x400 + tonumber(r,16) - 0xDC00
end
end
-- Slightly slower:
--
-- local p = C(4) * (C(4)^-1) / function(l,r)
-- if r then
-- return (tonumber(l,16))*0x400 + tonumber(r,16) - 0xDC00
-- else
-- return tonumber(l,16)
-- end
-- end
--
-- local function fromunicode16(str)
-- return lpegmatch(p,str)
-- end
-- This is quite a bit faster but at the cost of some memory but if we
-- do this we will also use it elsewhere so let's not follow this route
-- now. I might use this method in the plain variant (no caching there)
-- but then I need a flag that distinguishes between code branches.
--
-- local cache = { }
--
-- function mappings.tounicode16(unicode)
-- local s = cache[unicode]
-- if not s then
-- if unicode < 0x10000 then
-- s = format("%04X",unicode)
-- else
-- s = format("%04X%04X",unicode/0x400+0xD800,unicode%0x400+0xDC00)
-- end
-- cache[unicode] = s
-- end
-- return s
-- end
mappings.loadlumtable = loadlumtable
mappings.makenameparser = makenameparser
mappings.tounicode16 = tounicode16
mappings.tounicode16sequence = tounicode16sequence
mappings.fromunicode16 = fromunicode16
local ligseparator = P("_")
local varseparator = P(".")
local namesplitter = Ct(C((1 - ligseparator - varseparator)^1) * (ligseparator * C((1 - ligseparator - varseparator)^1))^0)
-- local function test(name)
-- local split = lpegmatch(namesplitter,name)
-- print(string.formatters["%s: [% t]"](name,split))
-- end
-- test("i.f_")
-- test("this")
-- test("this.that")
-- test("japan1.123")
-- test("such_so_more")
-- test("such_so_more.that")
function mappings.addtounicode(data,filename)
local resources = data.resources
local properties = data.properties
local descriptions = data.descriptions
local unicodes = resources.unicodes
if not unicodes then
return
end
-- we need to move this code
unicodes['space'] = unicodes['space'] or 32
unicodes['hyphen'] = unicodes['hyphen'] or 45
unicodes['zwj'] = unicodes['zwj'] or 0x200D
unicodes['zwnj'] = unicodes['zwnj'] or 0x200C
-- the tounicode mapping is sparse and only needed for alternatives
local private = fonts.constructors.privateoffset
local unknown = format("%04X",utfbyte("?"))
local unicodevector = fonts.encodings.agl.unicodes -- loaded runtime in context
local tounicode = { }
local originals = { }
resources.tounicode = tounicode
resources.originals = originals
local lumunic, uparser, oparser
local cidinfo, cidnames, cidcodes, usedmap
if false then -- will become an option
lumunic = loadlumtable(filename)
lumunic = lumunic and lumunic.tounicode
end
--
cidinfo = properties.cidinfo
usedmap = cidinfo and fonts.cid.getmap(cidinfo)
--
if usedmap then
oparser = usedmap and makenameparser(cidinfo.ordering)
cidnames = usedmap.names
cidcodes = usedmap.unicodes
end
uparser = makenameparser()
local ns, nl = 0, 0
for unic, glyph in next, descriptions do
local index = glyph.index
local name = glyph.name
if unic == -1 or unic >= private or (unic >= 0xE000 and unic <= 0xF8FF) or unic == 0xFFFE or unic == 0xFFFF then
local unicode = lumunic and lumunic[name] or unicodevector[name]
if unicode then
originals[index] = unicode
tounicode[index] = tounicode16(unicode,name)
ns = ns + 1
end
-- cidmap heuristics, beware, there is no guarantee for a match unless
-- the chain resolves
if (not unicode) and usedmap then
local foundindex = lpegmatch(oparser,name)
if foundindex then
unicode = cidcodes[foundindex] -- name to number
if unicode then
originals[index] = unicode
tounicode[index] = tounicode16(unicode,name)
ns = ns + 1
else
local reference = cidnames[foundindex] -- number to name
if reference then
local foundindex = lpegmatch(oparser,reference)
if foundindex then
unicode = cidcodes[foundindex]
if unicode then
originals[index] = unicode
tounicode[index] = tounicode16(unicode,name)
ns = ns + 1
end
end
if not unicode or unicode == "" then
local foundcodes, multiple = lpegmatch(uparser,reference)
if foundcodes then
originals[index] = foundcodes
if multiple then
tounicode[index] = tounicode16sequence(foundcodes)
nl = nl + 1
unicode = true
else
tounicode[index] = tounicode16(foundcodes,name)
ns = ns + 1
unicode = foundcodes
end
end
end
end
end
end
end
-- a.whatever or a_b_c.whatever or a_b_c (no numbers) a.b_
--
-- It is not trivial to find a solution that suits all fonts. We tried several alternatives
-- and this one seems to work reasonable also with fonts that use less standardized naming
-- schemes. The extra private test is tested by KE and seems to work okay with non-typical
-- fonts as well.
--
-- The next time I look into this, I'll add an extra analysis step to the otf loader (we can
-- resolve some tounicodes by looking into the gsub data tables that are bound to glyphs.
--
if not unicode or unicode == "" then
local split = lpegmatch(namesplitter,name)
local nsplit = split and #split or 0
local t, n = { }, 0
unicode = true
for l=1,nsplit do
local base = split[l]
local u = unicodes[base] or unicodevector[base]
if not u then
break
elseif type(u) == "table" then
if u[1] >= private then
unicode = false
break
end
n = n + 1
t[n] = u[1]
else
if u >= private then
unicode = false
break
end
n = n + 1
t[n] = u
end
end
if n == 0 then -- done then
-- nothing
elseif n == 1 then
originals[index] = t[1]
tounicode[index] = tounicode16(t[1],name)
else
originals[index] = t
tounicode[index] = tounicode16sequence(t)
end
nl = nl + 1
end
-- last resort (we might need to catch private here as well)
if not unicode or unicode == "" then
local foundcodes, multiple = lpegmatch(uparser,name)
if foundcodes then
if multiple then
originals[index] = foundcodes
tounicode[index] = tounicode16sequence(foundcodes,name)
nl = nl + 1
unicode = true
else
originals[index] = foundcodes
tounicode[index] = tounicode16(foundcodes,name)
ns = ns + 1
unicode = foundcodes
end
end
end
-- if not unicode then
-- originals[index] = 0xFFFD
-- tounicode[index] = "FFFD"
-- end
end
end
if trace_mapping then
for unic, glyph in table.sortedhash(descriptions) do
local name = glyph.name
local index = glyph.index
local toun = tounicode[index]
if toun then
report_fonts("internal slot %U, name %a, unicode %U, tounicode %a",index,name,unic,toun)
else
report_fonts("internal slot %U, name %a, unicode %U",index,name,unic)
end
end
end
if trace_loading and (ns > 0 or nl > 0) then
report_fonts("%s tounicode entries added, ligatures %s",nl+ns,ns)
end
end
-- local parser = makenameparser("Japan1")
-- local parser = makenameparser()
-- local function test(str)
-- local b, a = lpegmatch(parser,str)
-- print((a and table.serialize(b)) or b)
-- end
-- test("a.sc")
-- test("a")
-- test("uni1234")
-- test("uni1234.xx")
-- test("uni12349876")
-- test("u123400987600")
-- test("index1234")
-- test("Japan1.123")
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