1if not modules then modules = { } end modules ['luatex-fonts'] = { 2 version = 1.001, 3 comment = "companion to luatex-fonts.tex", 4 author = "Hans Hagen, PRAGMA-ADE, Hasselt NL", 5 copyright = "PRAGMA ADE / ConTeXt Development Team", 6 license = "see context related readme files" 7} 8 9-- A merged file is generated with: 10-- 11-- mtxrun --script package --merge --stripcontext luatex-fonts.lua 12-- 13-- A needed resource file is made by: 14-- 15-- mtxrun --script context luatex-basics-prepare.tex 16-- 17-- A font (generic) database is created with: 18-- 19-- mtxrun --script font --reload --simple 20 21-- The following code isolates the generic context code from already defined or to be defined 22-- namespaces. This is the reference loader for plain tex. This generic code is also used in 23-- luaotfload which is a low level lualatex opentype font loader but somehow has gotten a bit 24-- too generic name / prefix, originally set up and maintained by Khaled Hosny. Currently that 25-- set of derived files is maintained by a larger team lead by Philipp Gesang so when there are 26-- issues with this code in latex, you can best contact him. It might make sense then to first 27-- check if context has the same issue. We do our best to keep the interface as clean as possible. 28-- 29-- The code base is rather stable now, especially if you stay away from the non generic code. All 30-- relevant data is organized in tables within the main table of a font instance. There are a few 31-- places where in context other code is plugged in, but this does not affect the core code. Users 32-- can (given that their macro package provides this option) access the font data (characters, 33-- descriptions, properties, parameters, etc) of this main table. The documentation is part of 34-- context. There is also a manual for the helper libraries (maintained as part of the cld manuals). 35-- 36-- Future versions will probably have some more specific context code removed, like tracing and 37-- obscure hooks, so that we have a more efficient version (and less files too). So, don't depend 38-- too much on low level code that is meant for context as it can change without notice. We might 39-- also add more helper code here, but that depends to what extend metatex (sidetrack of context) 40-- evolves into a low level layer (depends on time, as usual). 41 42-- The code here is the same as in context version 2015.09.11 but the rendering in context can be 43-- different from generic. This can be a side effect of additional callbacks, additional features 44-- and interferences between mechanisms between macro packages. We use the rendering in context 45-- and luatex-plain as reference for issues. 46 47-- I might as well remove some code that is not used in generic (or not used by generic users) 48-- like color fonts (emoji etc) and variable fonts thereby making the code base smaller. However 49-- I might keep ity just for the sake of testing the plain loader that comes with context. We'll 50-- see. 51 52-- As a side effect of cleaning up some context code, like code meant for older version of luatex, 53-- as well replacing code for more recent versions (post 1.12) there can be changes in the modules 54-- used here, especially where we check for 'context' being used. Hopefully there are no side 55-- effects. Because we can now assume that the the glyph injection callback is in recent texlive 56-- installations, the variable font code is now enabled in the generic version that comes with 57-- context (as unofficial bonus; when it was demonstrated at bachotex 2017 it worked ok for the 58-- generic loader but was kind of disabled there as no one needs it). I waited with adding the 59-- pending code for type 3 support till texlive 2020 was fozen but it will be in texlive 2021 (it 60-- is already tested in context back in 2019 and I wanted to release it at the canceled BT 2020 61-- meeting, so I consider it stable, read: this is it). To what extend and when I will adapt the 62-- generic code (for color support) to that is yet to be decided because in context we do things 63-- a bit differently. We anyway have to wait a few years till that callback is omnipresent so I'm 64-- not in that much of a hurry. (There will be a TB article about it first and after that I will 65-- add some examples to the manual.) 66 67utf = utf or (unicode and unicode.utf8) or { } 68 69-- We have some (global) hooks (for latex). Maybe I'll use this signal to disable some of the 70-- more tricky features like variable fonts and emoji (because afaik latex uses hb for that). 71 72if not non_generic_context then 73 non_generic_context = { } 74end 75 76if not non_generic_context.luatex_fonts then 77 non_generic_context.luatex_fonts = { 78 -- load_before = nil, 79 -- load_after = nil, 80 -- skip_loading = nil, 81 } 82end 83 84if not generic_context then 85 generic_context = { } 86end 87 88if not generic_context.push_namespaces then 89 90 function generic_context.push_namespaces() 91 -- logs.report("system","push namespace") 92 local normalglobal = { } 93 for k, v in next, _G do 94 normalglobal[k] = v 95 end 96 return normalglobal 97 end 98 99 function generic_context.pop_namespaces(normalglobal,isolate) 100 if normalglobal then 101 -- logs.report("system","pop namespace") 102 for k, v in next, _G do 103 if not normalglobal[k] then 104 generic_context[k] = v 105 if isolate then 106 _G[k] = nil 107 end 108 end 109 end 110 for k, v in next, normalglobal do 111 _G[k] = v 112 end 113 -- just to be sure: 114 setmetatable(generic_context,_G) 115 else 116 logs.report("system","fatal error: invalid pop of generic_context") 117 os.exit() 118 end 119 end 120 121end 122 123local whatever = generic_context.push_namespaces() 124 125-- We keep track of load time by storing the current time. That way we cannot be accused 126-- of slowing down loading too much. Anyhow, there is no reason for this library to perform 127-- slower in any other package as it does in context. 128-- 129-- Please don't update to this version without proper testing. It might be that this version 130-- lags behind stock context and the only formal release takes place around tex live code 131-- freeze. 132 133local starttime = os.gettimeofday() 134 135-- As we don't use the context file searching, we need to initialize the kpse library. As the 136-- progname can be anything we will temporary switch to the context namespace if needed. Just 137-- adding the context paths to the path specification is somewhat faster. 138-- 139-- Now, with lua 5.2 being used we might create a special ENV for this. 140 141-- kpse.set_program_name("luatex") 142 143-- One can define texio.reporter as alternative terminal/log writer. That's as far 144-- as I want to go with this. 145 146local ctxkpse = nil 147local verbose = true 148 149if not logs or not logs.report then 150 if not logs then 151 logs = { } 152 end 153 function logs.report(c,f,...) 154 local r = texio.reporter or texio.write_nl 155 if f then 156 r(c .. " : " .. string.format(f,...)) 157 else 158 r("") 159 end 160 end 161end 162 163local function loadmodule(name,continue) 164 local foundname = kpse.find_file(name,"tex") or "" 165 if not foundname then 166 if not ctxkpse then 167 ctxkpse = kpse.new("luatex","context") 168 end 169 foundname = ctxkpse:find_file(name,"tex") or "" 170 end 171 if foundname == "" then 172 if not continue then 173 logs.report("system","unable to locate file '%s'",name) 174 os.exit() 175 end 176 else 177 if verbose then 178 logs.report("system","loading '%s'",foundname) -- no file.basename yet 179 end 180 dofile(foundname) 181 end 182end 183 184if non_generic_context.luatex_fonts.load_before then 185 loadmodule(non_generic_context.luatex_fonts.load_before,true) 186end 187 188if non_generic_context.luatex_fonts.skip_loading ~= true then 189 190 loadmodule('luatex-fonts-merged.lua',true) 191 192 if fonts then 193 194 if not fonts._merge_loaded_message_done_ then 195 texio.write_nl("log", "!") 196 texio.write_nl("log", "! I am using the merged version of 'luatex-fonts.lua' here. If") 197 texio.write_nl("log", "! you run into problems or experience unexpected behaviour, and") 198 texio.write_nl("log", "! if you have ConTeXt installed you can try to delete the file") 199 texio.write_nl("log", "! 'luatex-font-merged.lua' as I might then use the possibly") 200 texio.write_nl("log", "! updated libraries. The merged version is not supported as it") 201 texio.write_nl("log", "! is a frozen instance. Problems can be reported to the ConTeXt") 202 texio.write_nl("log", "! mailing list.") 203 texio.write_nl("log", "!") 204 end 205 206 fonts._merge_loaded_message_done_ = true 207 208 else 209 210 -- The following helpers are a bit overkill but I don't want to mess up 211 -- context code for the sake of general generality. Around version 1.0 212 -- there will be an official api defined. 213 -- 214 -- So, I will strip these libraries and see what is really needed so that 215 -- we don't have this overhead in the generic modules. The next section 216 -- is only there for the packager, so stick to using luatex-fonts with 217 -- luatex-fonts-merged.lua and forget about the rest. The following list 218 -- might change without prior notice (for instance because we shuffled 219 -- code around). 220 221 loadmodule("l-lua.lua") 222 loadmodule("l-lpeg.lua") 223 loadmodule("l-function.lua") 224 loadmodule("l-string.lua") 225 loadmodule("l-table.lua") 226 loadmodule("l-io.lua") 227 loadmodule("l-file.lua") 228 loadmodule("l-boolean.lua") 229 loadmodule("l-math.lua") 230 231 -- A few slightly higher level support modules: 232 233 loadmodule("util-str.lua") -- future versions can ship without this one 234 loadmodule("util-fil.lua") -- future versions can ship without this one 235 236 -- The following modules contain code that is either not used at all 237 -- outside context or will fail when enabled due to lack of other 238 -- modules. 239 240 -- First we load a few helper modules. This is about the miminum needed 241 -- to let the font modules do their work. Don't depend on their functions 242 -- as we might strip them in future versions of this generic variant. 243 244 loadmodule('luatex-basics-gen.lua') 245 loadmodule('data-con.lua') 246 247 -- We do need some basic node support. The code in there is not for 248 -- general use as it might change. 249 250 loadmodule('luatex-basics-nod.lua') 251 252 -- We ship a resources needed for font handling (more might end up here). 253 254 loadmodule('luatex-basics-chr.lua') 255 256 -- Now come the font modules that deal with traditional tex fonts as well 257 -- as open type fonts. 258 -- 259 -- The font database file (if used at all) must be put someplace visible 260 -- for kpse and is not shared with context. The mtx-fonts script can be 261 -- used to generate this file (using the --reload --force --simple option). 262 263 loadmodule('font-ini.lua') 264 loadmodule('luatex-fonts-mis.lua') 265 loadmodule('font-con.lua') 266 loadmodule('luatex-fonts-enc.lua') 267 loadmodule('font-cid.lua') 268 loadmodule('font-map.lua') 269 270 -- We use a bit simpler database because using the context one demands 271 -- loading more helper code and although it is more flexible (more ways 272 -- to resolve and so) it will never be uses in plain/latex anyway, so 273 -- let's stick to a simple approach. 274 275 loadmodule('luatex-fonts-syn.lua') 276 277 -- We need some helpers. 278 279 loadmodule('font-vfc.lua') 280 281 -- This is the bulk of opentype code. The color and variable font support (as for 282 -- emoji) can (and might) actually go away here because it has never been used 283 -- outside context so in retrospect there was no need for it being generic. 284 285 loadmodule('font-otr.lua') 286 loadmodule('font-cff.lua') 287 loadmodule('font-ttf.lua') 288 loadmodule('font-dsp.lua') 289 loadmodule('font-oti.lua') 290 loadmodule('font-ott.lua') 291 loadmodule('font-otl.lua') 292 loadmodule('font-oto.lua') 293 loadmodule('font-otj.lua') 294 loadmodule('font-oup.lua') 295 loadmodule('font-ota.lua') 296 loadmodule('font-ots.lua') 297 loadmodule('font-otc.lua') 298 loadmodule('font-osd.lua') 299 loadmodule('font-ocl.lua') 300 301 -- The code for type one fonts. 302 303 loadmodule('font-onr.lua') 304 loadmodule('font-one.lua') 305 loadmodule('font-afk.lua') 306 307 -- And for traditional TeX fonts. 308 309 loadmodule('luatex-fonts-tfm.lua') 310 311 -- Some common code. 312 313 loadmodule('font-lua.lua') 314 loadmodule('font-def.lua') 315 loadmodule('font-shp.lua') 316 317 -- We support xetex compatible specifiers (plain/latex only). 318 319 loadmodule('luatex-fonts-def.lua') -- was font-xtx.lua 320 321 -- Here come some additional features. 322 323 loadmodule('luatex-fonts-ext.lua') 324 loadmodule('font-imp-tex.lua') 325 loadmodule('font-imp-ligatures.lua') 326 loadmodule('font-imp-italics.lua') 327 loadmodule('font-imp-effects.lua') 328 loadmodule('luatex-fonts-lig.lua') 329 330 -- We need to plug into a callback and the following module implements the 331 -- handlers. Actual plugging in happens later. 332 333 loadmodule('luatex-fonts-gbn.lua') 334 335 end 336 337end 338 339if non_generic_context.luatex_fonts.load_after then 340 loadmodule(non_generic_context.luatex_fonts.load_after,true) 341end 342 343resolvers.loadmodule = loadmodule 344 345-- In order to deal with the fonts we need to initialize some callbacks. One can overload them later 346-- on if needed. First a bit of abstraction. 347 348generic_context.callback_ligaturing = false 349generic_context.callback_kerning = false 350generic_context.callback_pre_linebreak_filter = nodes.simple_font_handler 351generic_context.callback_hpack_filter = nodes.simple_font_handler 352generic_context.callback_define_font = fonts.definers.read 353 354-- The next ones can be done at a different moment if needed. You can create a generic_context namespace 355-- and set no_callbacks_yet to true, load this module, and enable the callbacks later. So, there is really 356-- *no* need to create a alternative for luatex-fonts.lua and luatex-fonts-merged.lua: just load this one 357-- and overload if needed. 358 359if not generic_context.no_callbacks_yet then 360 361 callback.register('ligaturing', generic_context.callback_ligaturing) 362 callback.register('kerning', generic_context.callback_kerning) 363 callback.register('pre_linebreak_filter', generic_context.callback_pre_linebreak_filter) 364 callback.register('hpack_filter', generic_context.callback_hpack_filter) 365 callback.register('define_font' , generic_context.callback_define_font) 366 367end 368 369-- We're done. 370 371logs.report("system","luatex-fonts.lua loaded in %0.3f seconds", os.gettimeofday()-starttime) 372 373generic_context.pop_namespaces(whatever) 374 |