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-rw-r--r--src/fontloader/misc/fontloader-font-onr.lua405
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diff --git a/src/fontloader/misc/fontloader-font-onr.lua b/src/fontloader/misc/fontloader-font-onr.lua
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+if not modules then modules = { } end modules ['font-onr'] = {
+ 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"
+}
+
+--[[ldx--
+<p>Some code may look a bit obscure but this has to do with the fact that we also use
+this code for testing and much code evolved in the transition from <l n='tfm'/> to
+<l n='afm'/> to <l n='otf'/>.</p>
+
+<p>The following code still has traces of intermediate font support where we handles
+font encodings. Eventually font encoding went away but we kept some code around in
+other modules.</p>
+
+<p>This version implements a node mode approach so that users can also more easily
+add features.</p>
+--ldx]]--
+
+local fonts, logs, trackers, resolvers = fonts, logs, trackers, resolvers
+
+local next, type, tonumber, rawget = next, type, tonumber, rawget
+local match, lower, gsub, strip, find = string.match, string.lower, string.gsub, string.strip, string.find
+local char, byte, sub = string.char, string.byte, string.sub
+local abs = math.abs
+local bxor, rshift = bit32.bxor, bit32.rshift
+local P, S, R, Cmt, C, Ct, Cs, Carg = lpeg.P, lpeg.S, lpeg.R, lpeg.Cmt, lpeg.C, lpeg.Ct, lpeg.Cs, lpeg.Carg
+local lpegmatch, patterns = lpeg.match, lpeg.patterns
+
+local trace_indexing = false trackers.register("afm.indexing", function(v) trace_indexing = v end)
+local trace_loading = false trackers.register("afm.loading", function(v) trace_loading = v end)
+
+local report_afm = logs.reporter("fonts","afm loading")
+
+fonts = fonts or { }
+local handlers = fonts.handlers or { }
+fonts.handlers = handlers
+local afm = handlers.afm or { }
+handlers.afm = afm
+local readers = afm.readers or { }
+afm.readers = readers
+
+afm.version = 1.512 -- incrementing this number one up will force a re-cache
+
+--[[ldx--
+<p>We start with the basic reader which we give a name similar to the built in <l n='tfm'/>
+and <l n='otf'/> reader.</p>
+<p>We use a new (unfinished) pfb loader but I see no differences between the old
+and new vectors (we actually had one bad vector with the old loader).</p>
+--ldx]]--
+
+local get_indexes
+
+do
+
+ local n, m
+
+ local progress = function(str,position,name,size)
+ local forward = position + tonumber(size) + 3 + 2
+ n = n + 1
+ if n >= m then
+ return #str, name
+ elseif forward < #str then
+ return forward, name
+ else
+ return #str, name
+ end
+ end
+
+ local initialize = function(str,position,size)
+ n = 0
+ m = tonumber(size)
+ return position + 1
+ end
+
+ local charstrings = P("/CharStrings")
+ local name = P("/") * C((R("az")+R("AZ")+R("09")+S("-_."))^1)
+ local size = C(R("09")^1)
+ local spaces = P(" ")^1
+
+ local p_filternames = Ct (
+ (1-charstrings)^0 * charstrings * spaces * Cmt(size,initialize)
+ * (Cmt(name * P(" ")^1 * C(R("09")^1), progress) + P(1))^1
+ )
+
+ -- if one of first 4 not 0-9A-F then binary else hex
+
+ local decrypt
+
+ do
+
+ local r, c1, c2, n = 0, 0, 0, 0
+
+ local function step(c)
+ local cipher = byte(c)
+ local plain = bxor(cipher,rshift(r,8))
+ r = ((cipher + r) * c1 + c2) % 65536
+ return char(plain)
+ end
+
+ decrypt = function(binary)
+ r, c1, c2, n = 55665, 52845, 22719, 4
+ binary = gsub(binary,".",step)
+ return sub(binary,n+1)
+ end
+
+ -- local pattern = Cs((P(1) / step)^1)
+ --
+ -- decrypt = function(binary)
+ -- r, c1, c2, n = 55665, 52845, 22719, 4
+ -- binary = lpegmatch(pattern,binary)
+ -- return sub(binary,n+1)
+ -- end
+
+ end
+
+ local function loadpfbvector(filename)
+ -- for the moment limited to encoding only
+
+ local data = io.loaddata(resolvers.findfile(filename))
+
+ if not data then
+ print("no data",filename)
+ return
+ end
+
+ if not find(data,"!PS%-AdobeFont%-") then
+ print("no font",filename)
+ return
+ end
+
+ local ascii, binary = match(data,"(.*)eexec%s+......(.*)")
+
+ if not binary then
+ print("no binary",filename)
+ return
+ end
+
+ binary = decrypt(binary,4)
+
+ local vector = lpegmatch(p_filternames,binary)
+
+ if vector[1] == ".notdef" then
+ -- tricky
+ vector[0] = table.remove(vector,1)
+ end
+
+ if not vector then
+ print("no vector",filename)
+ return
+ end
+
+ return vector
+
+ end
+
+ get_indexes = function(data,pfbname)
+ local vector = loadpfbvector(pfbname)
+ if vector then
+ local characters = data.characters
+ if trace_loading then
+ report_afm("getting index data from %a",pfbname)
+ end
+ for index=1,#vector do
+ local name = vector[index]
+ local char = characters[name]
+ if char then
+ if trace_indexing then
+ report_afm("glyph %a has index %a",name,index)
+ end
+ char.index = index
+ end
+ end
+ end
+ end
+
+end
+
+--[[ldx--
+<p>We start with the basic reader which we give a name similar to the built in <l n='tfm'/>
+and <l n='otf'/> reader. We only need data that is relevant for our use. We don't support
+more complex arrangements like multiple master (obsolete), direction specific kerning, etc.</p>
+--ldx]]--
+
+local spacing = patterns.whitespace
+local lineend = patterns.newline
+local number = spacing * S("+-")^-1 * (R("09") + S("."))^1 / tonumber
+local name = spacing * C((1-spacing)^1)
+local words = spacing * (1 - lineend)^1 / strip
+local rest = (1 - lineend)^0
+local fontdata = Carg(1)
+local semicolon = spacing * P(";")
+local plus = P("plus") * number
+local minus = P("minus") * number
+
+-- kern pairs
+
+local function addkernpair(data,one,two,value)
+ local chr = data.characters[one]
+ if chr then
+ local kerns = chr.kerns
+ if kerns then
+ kerns[two] = tonumber(value)
+ else
+ chr.kerns = { [two] = tonumber(value) }
+ end
+ end
+end
+
+local p_kernpair = (fontdata * P("KPX") * name * name * number) / addkernpair
+
+-- char metrics
+
+local chr = false
+local ind = 0
+
+local function start(data,version)
+ data.metadata.afmversion = version
+ ind = 0
+ chr = { }
+end
+
+local function stop()
+ ind = 0
+ chr = false
+end
+
+local function setindex(i)
+ if i < 0 then
+ ind = ind + 1 -- ?
+ else
+ ind = i
+ end
+ chr = {
+ index = ind
+ }
+end
+
+local function setwidth(width)
+ chr.width = width
+end
+
+local function setname(data,name)
+ data.characters[name] = chr
+end
+
+local function setboundingbox(boundingbox)
+ chr.boundingbox = boundingbox
+end
+
+local function setligature(plus,becomes)
+ local ligatures = chr.ligatures
+ if ligatures then
+ ligatures[plus] = becomes
+ else
+ chr.ligatures = { [plus] = becomes }
+ end
+end
+
+local p_charmetric = ( (
+ P("C") * number / setindex
+ + P("WX") * number / setwidth
+ + P("N") * fontdata * name / setname
+ + P("B") * Ct((number)^4) / setboundingbox
+ + P("L") * (name)^2 / setligature
+ ) * semicolon )^1
+
+local p_charmetrics = P("StartCharMetrics") * number * (p_charmetric + (1-P("EndCharMetrics")))^0 * P("EndCharMetrics")
+local p_kernpairs = P("StartKernPairs") * number * (p_kernpair + (1-P("EndKernPairs" )))^0 * P("EndKernPairs" )
+
+local function set_1(data,key,a) data.metadata[lower(key)] = a end
+local function set_2(data,key,a,b) data.metadata[lower(key)] = { a, b } end
+local function set_3(data,key,a,b,c) data.metadata[lower(key)] = { a, b, c } end
+
+-- Notice string
+-- EncodingScheme string
+-- MappingScheme integer
+-- EscChar integer
+-- CharacterSet string
+-- Characters integer
+-- IsBaseFont boolean
+-- VVector number number
+-- IsFixedV boolean
+
+local p_parameters = P(false)
+ + fontdata
+ * ((P("FontName") + P("FullName") + P("FamilyName"))/lower)
+ * words / function(data,key,value)
+ data.metadata[key] = value
+ end
+ + fontdata
+ * ((P("Weight") + P("Version"))/lower)
+ * name / function(data,key,value)
+ data.metadata[key] = value
+ end
+ + fontdata
+ * P("IsFixedPitch")
+ * name / function(data,pitch)
+ data.metadata.monospaced = toboolean(pitch,true)
+ end
+ + fontdata
+ * P("FontBBox")
+ * Ct(number^4) / function(data,boundingbox)
+ data.metadata.boundingbox = boundingbox
+ end
+ + fontdata
+ * ((P("CharWidth") + P("CapHeight") + P("XHeight") + P("Descender") + P("Ascender") + P("ItalicAngle"))/lower)
+ * number / function(data,key,value)
+ data.metadata[key] = value
+ end
+ + P("Comment") * spacing * ( P(false)
+ + (fontdata * C("DESIGNSIZE") * number * rest) / set_1 -- 1
+ + (fontdata * C("TFM designsize") * number * rest) / set_1
+ + (fontdata * C("DesignSize") * number * rest) / set_1
+ + (fontdata * C("CODINGSCHEME") * words * rest) / set_1 --
+ + (fontdata * C("CHECKSUM") * number * words * rest) / set_1 -- 2
+ + (fontdata * C("SPACE") * number * plus * minus * rest) / set_3 -- 3 4 5
+ + (fontdata * C("QUAD") * number * rest) / set_1 -- 6
+ + (fontdata * C("EXTRASPACE") * number * rest) / set_1 -- 7
+ + (fontdata * C("NUM") * number * number * number * rest) / set_3 -- 8 9 10
+ + (fontdata * C("DENOM") * number * number * rest) / set_2 -- 11 12
+ + (fontdata * C("SUP") * number * number * number * rest) / set_3 -- 13 14 15
+ + (fontdata * C("SUB") * number * number * rest) / set_2 -- 16 17
+ + (fontdata * C("SUPDROP") * number * rest) / set_1 -- 18
+ + (fontdata * C("SUBDROP") * number * rest) / set_1 -- 19
+ + (fontdata * C("DELIM") * number * number * rest) / set_2 -- 20 21
+ + (fontdata * C("AXISHEIGHT") * number * rest) / set_1 -- 22
+ )
+
+local fullparser = ( P("StartFontMetrics") * fontdata * name / start )
+ * ( p_charmetrics + p_kernpairs + p_parameters + (1-P("EndFontMetrics")) )^0
+ * ( P("EndFontMetrics") / stop )
+
+local infoparser = ( P("StartFontMetrics") * fontdata * name / start )
+ * ( p_parameters + (1-P("EndFontMetrics")) )^0
+ * ( P("EndFontMetrics") / stop )
+
+-- infoparser = ( P("StartFontMetrics") * fontdata * name / start )
+-- * ( p_parameters + (1-P("EndFontMetrics") - P("StartCharMetrics")) )^0
+-- * ( (P("EndFontMetrics") + P("StartCharMetrics")) / stop )
+
+local function read(filename,parser)
+ local afmblob = io.loaddata(filename)
+ if afmblob then
+ local data = {
+ resources = {
+ filename = resolvers.unresolve(filename),
+ version = afm.version,
+ creator = "context mkiv",
+ },
+ properties = {
+ hasitalics = false,
+ },
+ goodies = {
+ },
+ metadata = {
+ filename = file.removesuffix(file.basename(filename))
+ },
+ characters = {
+ -- a temporary store
+ },
+ descriptions = {
+ -- the final store
+ },
+ }
+ if trace_loading then
+ report_afm("parsing afm file %a",filename)
+ end
+ lpegmatch(parser,afmblob,1,data)
+ return data
+ else
+ if trace_loading then
+ report_afm("no valid afm file %a",filename)
+ end
+ return nil
+ end
+end
+
+function readers.loadfont(afmname,pfbname)
+ local data = read(resolvers.findfile(afmname),fullparser)
+ if data then
+ if not pfbname or pfbname == "" then
+ pfbname = file.replacesuffix(file.nameonly(afmname),"pfb")
+ pfbname = resolvers.findfile(pfbname)
+ end
+ if pfbname and pfbname ~= "" then
+ data.resources.filename = resolvers.unresolve(pfbname)
+ get_indexes(data,pfbname)
+ elseif trace_loading then
+ report_afm("no pfb file for %a",afmname)
+ -- data.resources.filename = "unset" -- better than loading the afm file
+ end
+ return data
+ end
+end
+
+function readers.getinfo(filename)
+ local data = read(resolvers.findfile(filename),infoparser)
+ if data then
+ return data.metadata
+ end
+end
+