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-rw-r--r--tex/context/base/mkiv/font-enc.lua153
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diff --git a/tex/context/base/mkiv/font-enc.lua b/tex/context/base/mkiv/font-enc.lua
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+++ b/tex/context/base/mkiv/font-enc.lua
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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+-- this module is obsolete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 = next
+local match, gmatch, gsub = string.match, string.gmatch, string.gsub
+
+local setmetatableindex = table.setmetatableindex
+
+--[[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 = encodings
+
+encodings.version = 1.03
+encodings.cache = containers.define("fonts", "enc", fonts.encodings.version, true)
+encodings.known = utilities.storage.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","")
+ 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(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 = { }
+
+ 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