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if not modules then modules = { } end modules ['font-enc'] = {
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 match, gmatch, gsub = string.match, string.gmatch, string.gsub
--[[ldx--
<p>Because encodings are going to disappear, we don't bother defining
them in tables. But we may do so some day, for consistency.</p>
--ldx]]--
fonts.enc = fonts.enc or { }
fonts.enc.version = 1.03
fonts.enc.cache = containers.define("fonts", "enc", fonts.enc.version, true)
fonts.enc.known = { -- sort of obsolete
texnansi = true,
ec = true,
qx = true,
t5 = true,
t2a = true,
t2b = true,
t2c = true,
unicode = true
}
function fonts.enc.is_known(encoding)
return containers.is_valid(fonts.enc.cache(),encoding)
end
--[[ldx--
<p>An encoding file looks like this:</p>
<typing>
/TeXnANSIEncoding [
/.notdef
/Euro
...
/ydieresis
] def
</typing>
<p>Beware! The generic encoding files don't always apply to the ones that
ship with fonts. This has to do with the fact that names follow (slightly)
different standards. However, the fonts where this applies to (for instance
Latin Modern or <l n='tex'> Gyre) come in OpenType variants too, so these
will be used.</p>
--ldx]]--
function fonts.enc.load(filename)
local name = file.removesuffix(filename)
local data = containers.read(fonts.enc.cache(),name)
if data then
return data
end
if name == "unicode" then
data = fonts.enc.make_unicode_vector() -- special case, no tex file for this
end
if data then
return data
end
local vector, tag, hash, unicodes = { }, "", { }, { }
local foundname = resolvers.find_file(filename,'enc')
if foundname and foundname ~= "" then
local ok, encoding, size = resolvers.loadbinfile(foundname)
if ok and encoding then
local enccodes = characters.enccodes
encoding = gsub(encoding,"%%(.-)\n","")
local tag, vec = match(encoding,"/(%w+)%s*%[(.*)%]%s*def")
local i = 0
for ch in gmatch(vec,"/([%a%d%.]+)") do
if ch ~= ".notdef" then
vector[i] = ch
if not hash[ch] then
hash[ch] = i
else
-- duplicate, play safe for tex ligs and take first
end
if enccodes[ch] then
unicodes[enccodes[ch]] = i
end
end
i = i + 1
end
end
end
local data = {
name=name,
tag=tag,
vector=vector,
hash=hash,
unicodes=unicodes
}
return containers.write(fonts.enc.cache(), name, data)
end
--[[ldx--
<p>There is no unicode encoding but for practical purposed we define
one.</p>
--ldx]]--
-- maybe make this a function:
function fonts.enc.make_unicode_vector()
local vector, hash = { }, { }
for code, v in next, characters.data do
local name = v.adobename
if name then
vector[code], hash[name] = name, code
else
vector[code] = '.notdef'
end
end
for name, code in next, characters.synonyms do
vector[code], hash[name] = name, code
end
return containers.write(fonts.enc.cache(), 'unicode', { name='unicode', tag='unicode', vector=vector, hash=hash })
end
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