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Diffstat (limited to 'luaotfload.lua')
| -rw-r--r-- | luaotfload.lua | 411 |
1 files changed, 0 insertions, 411 deletions
diff --git a/luaotfload.lua b/luaotfload.lua deleted file mode 100644 index 256c792..0000000 --- a/luaotfload.lua +++ /dev/null @@ -1,411 +0,0 @@ -module("luaotfload", package.seeall) - -luaotfload.module = { - name = "luaotfload", - version = 2.2, - date = "2013/04/15", - description = "OpenType layout system.", - author = "Elie Roux & Hans Hagen", - copyright = "Elie Roux", - license = "CC0" -} - -local luatexbase = luatexbase - -local type, next = type, next -local stringfind = string.find -local stringsub = string.sub -local stringmatch = string.match -local find_file = kpse.find_file - -local add_to_callback, create_callback = - luatexbase.add_to_callback, luatexbase.create_callback -local reset_callback, call_callback = - luatexbase.reset_callback, luatexbase.call_callback - -local dummy_function = function () end - ---[[doc-- -No final decision has been made on how to handle font definition. At -the moment, there are three candidates: The \identifier{generic} -callback as hard-coded in the font loader, the \identifier{old} -wrapper, and a simplified version of the latter (\identifier{patch}) -that does nothing besides applying font patches. ---doc]]-- -luaotfload.font_definer = "patch" --- | “generic” | “old” - -local error, warning, info, log = - luatexbase.provides_module(luaotfload.module) - ---[[doc-- -This is a necessary initalization in order not to rebuild an existing -font. -Maybe 600 should be replaced by \texmacro{pdfpkresolution} %% (why?) -or \luafunction{texconfig.pk_dpi} (and it should be replaced -dynamically), but we don't have access (yet) to the -\identifier{texconfig} table, so we let it be 600. -Anyway, it does still work fine even if \texmacro{pdfpkresolution} is -changed. ---doc]]-- - -kpse.init_prog("", 600, "/") - ---[[doc-- -We set the minimum version requirement for \LUATEX to v0.74, as it was -the first version to include version 5.2 of the \LUA interpreter. ---doc]]-- - -local luatex_version = 74 - -if tex.luatexversion < luatex_version then - warning("LuaTeX v%.2f is old, v%.2f is recommended.", - tex.luatexversion/100, - luatex_version /100) -end - ---[[doc-- -\subsection{Module loading} - -We load the files imported from \CONTEXT with this function. -It automatically prepends the prefix \fileent{otfl-} to its argument, -so we can refer to the files with their actual \CONTEXT name. ---doc]]-- - -local fl_prefix = "otfl" -- “luatex” for luatex-plain -local loadmodule = function (name) - local tofind = fl_prefix .."-"..name - local found = find_file(tofind,"tex") - if found then - log("loading file %s.", found) - dofile(found) - else - error("file %s not found.", tofind) - end -end - ---[[doc-- -Virtual fonts are resolved via a callback. -\luafunction{find_vf_file} derives the name of the virtual font file -from the filename. -(NB: \CONTEXT handles this likewise in \fileent{font-vf.lua}.) ---doc]]-- -local Cs, P, lpegmatch = lpeg.Cs, lpeg.P, lpeg.match - -local p_dot, p_slash = P".", P"/" -local p_suffix = (p_dot * (1 - p_dot - p_slash)^1 * P(-1)) / "" -local p_removesuffix = Cs((p_suffix + 1)^1) - -local find_vf_file = function (name) - local fullname = find_file(name, "ovf") - if not fullname then - --fullname = find_file(file.removesuffix(name), "ovf") - fullname = find_file(lpegmatch(p_removesuffix, name), "ovf") - end - if fullname then - log("loading virtual font file %s.", fullname) - end - return fullname -end - ---[[doc-- - -\subsection{Preparing the Font Loader} -We treat the fontloader as a black box so behavior is consistent -between formats. -The wrapper file is \fileent{otfl-fonts.lua} which we imported from -\href{http://standalone.contextgarden.net/current/context/experimental/tex/generic/context/luatex/}{\LUATEX-Plain}. -It has roughly two purposes: - -\begin{enumerate} - - \item insert the functionality required for fontloader; and - - \item put it in place via the respective callbacks. - -\end{enumerate} - -How the first step is executed depends on the presence on the -\emphasis{merged font loader code}. -In \identifier{luaotfload} this is contained in the file -\fileent{otfl-fonts-merged.lua}. -If this file cannot be found, the original libraries from \CONTEXT of -which the merged code was composed are loaded instead. - -Hans provides two global tables to control the font loader: - - \begin{itemize} - \item \luafunction{generic_context}: - encapsulation mechanism, callback functions - \item \luafunction{non generic_context}: - customized code insertion - \end{itemize} - - -With \luafunction{non_generic_context} we can tailor the font loader -insertion to our file naming habits (key \luafunction{load_before}). -Additionally, \luafunction{skip_loading} can be unset to force loading -of the original libraries as though the merged code was absent. -Another key, \luafunction{load_after} is called at the time when the -font loader is actually inserted. -In combination with the option \luafunction{no_callbacks_yet} in -\luafunction{generic_context}, we can insert our own, -\identifier{luatexbase}-style callback handling here. ---doc]]-- -if not _G. generic_context then _G. generic_context = { } end -if not _G.non_generic_context then _G.non_generic_context = { } end - -local generic_context = generic_context -local non_generic_context =non_generic_context - -generic_context.no_callbacks_yet = true - -_G.non_generic_context = { luatex_fonts = { - load_before = "otfl-fonts-merged.lua", - -- load_after = nil, --- TODO, this is meant for callbacks - skip_loading = true, -}} - ---[[doc-- -The imported font loader will call \luafunction{callback.register} once -while reading \fileent{font-def.lua}. -This is unavoidable unless we modify the imported files, but harmless -if we make it call a dummy instead. ---doc]]-- - -local trapped_register = callback.register -callback.register = dummy_function - ---[[doc-- -Now that things are sorted out we can finally load the fontloader. ---doc]]-- - -loadmodule"fonts.lua" - ---[[doc-- -By default, the fontloader requires a number of \emphasis{private -attributes} for internal use. -These must be kept consistent with the attribute handling methods as -provided by \identifier{luatexbase}. -Our strategy is to override the function that allocates new attributes -before we initialize the font loader, making it a wrapper around -\luafunction{luatexbase.new_attribute}.\footnote{% - Many thanks, again, to Hans Hagen for making this part - configurable! -} -The attribute identifiers are prefixed “\fileent{otfl@}” to -avoid name clashes. ---doc]]-- - -do - local new_attribute = luatexbase.new_attribute - local the_attributes = luatexbase.attributes - - _G.attributes = _G.attributes or { } - - _G.attributes.private = function (name) - local attr = "otfl@" .. name - local number = the_attributes[attr] - if not number then - number = new_attribute(attr) - end - return number - end -end - ---[[doc-- - -\subsection{Callbacks} - -After the fontloader is ready we can restore the callback trap from -\identifier{luatexbase}. ---doc]]-- - -callback.register = trapped_register - ---[[doc-- -We do our own callback handling with the means provided by luatexbase. - -Note: \luafunction{pre_linebreak_filter} and \luafunction{hpack_filter} -are coupled in \CONTEXT in the concept of \emphasis{node processor}. ---doc]]-- - -add_to_callback("pre_linebreak_filter", - generic_context.callback_pre_linebreak_filter, - "luaotfload.node_processor", - 1) -add_to_callback("hpack_filter", - generic_context.callback_hpack_filter, - "luaotfload.node_processor", - 1) -add_to_callback("find_vf_file", - find_vf_file, "luaotfload.find_vf_file") - -loadmodule"font-otc.lua" -- TODO check what we can drop from otfl-features -loadmodule"lib-dir.lua" -- required by font-nms -loadmodule"luat-ovr.lua" - -if fonts and fonts.readers.tfm then - -------------------------------------------------------------------- - --- OFM; read this first - -------------------------------------------------------------------- - --- I can’t quite make out whether this is still relevant - --- as those ofm fonts always fail, even in the 2011 version - --- (mktexpk: don't know how to create bitmap font for omarabb.ofm) - --- the font loader appears to read ofm like tfm so if this - --- hack was supposed achieve that, we should excise it anyways - fonts.readers.ofm = fonts.readers.tfm - fonts.handlers.ofm = fonts.handlers.tfm --- empty anyways - fonts.formats.ofm = fonts.formats.tfm --- “type1” - --- fonts.readers.sequence[#fonts.readers.sequence+1] = "ofm" - -------------------------------------------------------------------- -end - ---[[doc-- - -Now we load the modules written for \identifier{luaotfload}. - ---doc]]-- -loadmodule"font-pfb.lua" --- new in 2.0, added 2011 -loadmodule"font-nms.lua" -loadmodule"font-clr.lua" -loadmodule"font-ltx.lua" --- new in 2.0, added 2011 - ---[[doc-- - -We create a callback for patching fonts on the fly, to be used by other -packages. -It initially contains the empty function that we are going to override -below. - ---doc]]-- - -create_callback("luaotfload.patch_font", "simple", dummy_function) - ---[[doc-- - -This is a wrapper for the imported font loader. -As of 2013, everything it does appear to be redundand, so we won’t use -it unless somebody points out a cogent reason. -Nevertheless, it has been adapted to work with the current structure of -font data objects and will stay here for reference / until breakage is -reported. - -\emphasis{TODO} -This one also enables patching fonts. -The current fontloader apparently comes with a dedicated mechanism for -that already: enhancers. -How those work remains to be figured out. - ---doc]]-- -local define_font_wrapper = function (...) - --- we use “tfmdata” (not “fontdata”) for consistency with the - --- font loader - local tfmdata = fonts.definers.read(...) - if type(tfmdata) == "table" and tfmdata.shared then - local metadata = tfmdata.shared.rawdata.metadata - local mathdata = metadata.math --- do all fonts have this field? - if mathdata then - local mathconstants = { } --- why new hash, not modify in place? - local units_per_em = metadata.units_per_em - local size = tfmdata.size - for k,v in next, mathdata do - --- afaics this is alread taken care of by - --- definers.read - if stringfind(k, "Percent") then - -- keep percent values as is - print(k,v) - mathconstants[k] = v - else - mathconstants[k] = v / units_per_em * size - end - end - --- for \overwithdelims - --- done by definers.read as well - mathconstants.FractionDelimiterSize = 1.01 * size - --- fontloader has 2.4 × size - mathconstants.FractionDelimiterDisplayStyleSize = 2.39 * size - tfmdata.MathConstants = mathconstants - end - call_callback("luaotfload.patch_font", tfmdata) - end - return tfmdata -end - ---[[doc-- - -\subsection{\CONTEXT override} - -We provide a simplified version of the original font definition -callback. - ---doc]]-- - -local read_font_file = fonts.definers.read -local patch_defined_font = function (...) - local tfmdata = read_font_file(...)-- spec -> size -> id -> tmfdata - if type(tfmdata) == "table" then - call_callback("luaotfload.patch_font", tfmdata) - end - return tfmdata -end - -caches.compilemethod = "both" - -reset_callback("define_font") - ---[[doc-- -Finally we register the callbacks ---doc]]-- - -if luaotfload.font_definer == "old" then - add_to_callback("define_font", - define_font_wrapper, - "luaotfload.define_font", - 1) -elseif luaotfload.font_definer == "generic" then - add_to_callback("define_font", - generic_context.callback_define_font, - "luaotfload.define_font", - 1) -elseif luaotfload.font_definer == "patch" then - add_to_callback("define_font", - patch_defined_font, - "luaotfload.define_font", - 1) -end - ---[[todo-- ---- The manual promises coercion of the file: lookup if ---- the asked name is enclosed in brackets. ---- A couple things make me doubt that this is the case: ---- ---- 1) there doesn’t appear to be code for these cases ---- 2) the brackets remain part of the file name ---- 3) we still get calls to names.resolve which ---- ignores the “lookup” field of the spec it gets ---- ---- For this reason here is some code that a) coerces ---- file: lookups in these cases and b) strips the brackets ---- from the file name. As we *still* get name: lookups even ---- though this code is active I’ll just leave it here ---- for reference, ineffective as it is. -do - local getspecification, makespecification = - fonts.definers.getspecification, fonts.definers.makespecification - - local analyze = function (specification, size) - local lookup, name, sub, method, detail = getspecification(specification or "") - local filename = stringmatch(name, "^%[(.*)%]$") - if filename then - lookup = "file" --> coerce file: - name = filename --> remove brackets - end - return makespecification(specification, lookup, name, sub, method, detail, size) - end - fonts.definers.analyze = analyze -end ---]]-- - -loadmodule"features.lua" - --- vim:tw=71:sw=4:ts=4:expandtab |