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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"
}
-- this module is obsolete
local next, rawget = next, rawget
local match, gmatch, gsub = string.match, string.gmatch, string.gsub
local setmetatableindex = table.setmetatableindex
local allocate = utilities.storage.allocate
local mark = utilities.storage.mark
--[[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]]--
local report_encoding = logs.reporter("fonts","encoding")
local encodings = fonts.encodings or { }
fonts.encodings = encodings
encodings.version = 1.04
encodings.cache = containers.define("fonts", "enc", fonts.encodings.version, true)
encodings.known = allocate { -- sort of obsolete
texnansi = true,
ec = true,
qx = true,
t5 = true,
t2a = true,
t2b = true,
t2c = true,
unicode = true,
}
function encodings.is_known(encoding)
return containers.is_valid(encodings.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]]--
local enccodes = characters.enccodes or { }
function encodings.load(filename)
local name = file.removesuffix(filename)
local data = containers.read(encodings.cache,name)
if data then
return data
end
if name == "unicode" then
data = encodings.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.findfile(filename,'enc')
if foundname and foundname ~= "" then
local ok, encoding, size = resolvers.loadbinfile(foundname)
if ok and encoding then
encoding = gsub(encoding,"%%(.-)[\n\r]+","")
if encoding then
local unicoding = fonts.encodings.agl.unicodes
local tag, vec = match(encoding,"[/]*(%w+)%s*%[(.*)%]%s*def")
if vec then
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
local u = unicoding[ch] or enccodes[ch] -- enccodes have also context names
if u then
unicodes[u] = i
end
end
i = i + 1
end
else
report_encoding("reading vector in encoding file %a fails",filename)
end
else
report_encoding("reading encoding file %a fails",filename)
end
end
end
local data = {
name = name,
tag = tag,
vector = vector,
hash = hash,
unicodes = unicodes
}
return containers.write(encodings.cache, name, data)
end
--[[ldx--
<p>There is no unicode encoding but for practical purposes we define
one.</p>
--ldx]]--
-- maybe make this a function:
function encodings.make_unicode_vector()
local vector, hash = { }, { }
for code, v in next, characters.data do
local name = v.adobename
if name then
vector[code] = name
hash[name] = code
else
vector[code] = '.notdef'
end
end
for name, code in next, characters.synonyms do
if not vector[code] then
vector[code] = name
end
if not hash[name] then
hash[name] = code
end
end
return containers.write(encodings.cache, 'unicode', { name='unicode', tag='unicode', vector=vector, hash=hash })
end
if not encodings.agl then
-- We delay delay loading this rather big vector that is only needed when a
-- font is loaded for caching. Once we're further along the route we can also
-- delay it in the generic version (which doesn't use this file).
encodings.agl = allocate { }
setmetatableindex(encodings.agl, function(t,k)
report_encoding("loading (extended) adobe glyph list")
dofile(resolvers.findfile("font-agl.lua"))
return rawget(encodings.agl,k)
end)
end
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