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Diffstat (limited to 'luaotfload-extralibs.lua')
| -rw-r--r-- | luaotfload-extralibs.lua | 300 |
1 files changed, 0 insertions, 300 deletions
diff --git a/luaotfload-extralibs.lua b/luaotfload-extralibs.lua deleted file mode 100644 index 336bc6d..0000000 --- a/luaotfload-extralibs.lua +++ /dev/null @@ -1,300 +0,0 @@ -if not modules then modules = { } end modules ["extralibs"] = { - version = "2.4", - comment = "companion to luaotfload.lua", - author = "Philipp Gesang, based on code by Hans Hagen", - copyright = "PRAGMA ADE / ConTeXt Development Team", - license = "GPL v.2.0", -} - ---===================================================================-- ---- PREPARE ---===================================================================-- - -local getmetatable = getmetatable -local require = require -local setmetatable = setmetatable -local tonumber = tonumber - -local new_node = node.new -local copy_node = node.copy -local otffeatures = fonts.constructors.newfeatures "otf" - ------------------------------------------------------------------------ ---- namespace ------------------------------------------------------------------------ - ---[[doc-- - - Since the letterspacing method was derived initially from Context’s - typo-krn.lua we keep the sub-namespace “typesetters” inside the - “luaotfload” table. - ---doc]]-- - -luaotfload.typesetters = luaotfload.typesetters or { } -local typesetters = luaotfload.typesetters -typesetters.kernfont = typesetters.kernfont or { } -local kernfont = typesetters.kernfont - ------------------------------------------------------------------------ ---- node-ini ------------------------------------------------------------------------ - -nodes = nodes or { } --- should be present with luaotfload -local bothways = function (t) return table.swapped (t, t) end - -local kerncodes = bothways({ - [0] = "fontkern", - [1] = "userkern", - [2] = "accentkern", -}) - -kerncodes.kerning = kerncodes.fontkern --- idiosyncrasy -nodes.kerncodes = kerncodes - ------------------------------------------------------------------------ ---- node-res ------------------------------------------------------------------------ - -nodes.pool = nodes.pool or { } -local pool = nodes.pool - -local kern = new_node ("kern", nodes.kerncodes.userkern) -local glue_spec = new_node "glue_spec" - -pool.kern = function (k) - local n = copy_node (kern) - n.kern = k - return n -end - -pool.glue = function (width, stretch, shrink, - stretch_order, shrink_order) - local n = new_node"glue" - if not width then - -- no spec - elseif width == false or tonumber(width) then - local s = copy_node(glue_spec) - if width then s.width = width end - if stretch then s.stretch = stretch end - if shrink then s.shrink = shrink end - if stretch_order then s.stretch_order = stretch_order end - if shrink_order then s.shrink_order = shrink_order end - n.spec = s - else - -- shared - n.spec = copy_node(width) - end - return n -end - ------------------------------------------------------------------------ ---- font-hsh ------------------------------------------------------------------------ ---- some initialization resembling font-hsh -local fonthashes = fonts.hashes -local identifiers = fonthashes.identifiers --- was: fontdata -local chardata = fonthashes.characters -local quaddata = fonthashes.quads -local parameters = fonthashes.parameters - ---- ('a, 'a) hash -> (('a, 'a) hash -> 'a -> 'a) -> ('a, 'a) hash -local setmetatableindex = function (t, f) - local mt = getmetatable(t) - if mt then - mt.__index = f - else - setmetatable(t, { __index = f }) - end - return t -end - -if not parameters then - parameters = { } - setmetatableindex(parameters, function(t, k) - if k == true then - return parameters[currentfont()] - else - local parameters = identifiers[k].parameters - t[k] = parameters - return parameters - end - end) - fonthashes.parameters = parameters -end - -if not chardata then - chardata = { } - setmetatableindex(chardata, function(t, k) - if k == true then - return chardata[currentfont()] - else - local tfmdata = identifiers[k] - if not tfmdata then --- unsafe - tfmdata = font.fonts[k] - end - if tfmdata then - local characters = tfmdata.characters - t[k] = characters - return characters - end - end - end) - fonthashes.characters = chardata -end - -if not quaddata then - quaddata = { } - setmetatableindex(quaddata, function(t, k) - if k == true then - return quads[currentfont()] - else - local parameters = parameters[k] - local quad = parameters and parameters.quad or 0 - t[k] = quad - return quad - end - end) - fonthashes.quads = quaddata -end - ---===================================================================-- ---- LOAD ---===================================================================-- - ---- we should be ready at this moment to insert the libraries -require "luaotfload-letterspace" --- typesetters.kernfont - ---===================================================================-- ---- CLEAN ---===================================================================-- - ---- kernfont_callback : fontwise ---- · callback: kernfont.handler ---- · enabler: enablefontkerning ---- · disabler: disablefontkerning - ---- callback wrappers - ---- (node_t -> node_t) -> string -> string list -> bool -local registered_as = { } --- procname -> callbacks -local add_processor = function (processor, name, ...) - local callbacks = { ... } - for i=1, #callbacks do - luatexbase.add_to_callback(callbacks[i], processor, name) - end - registered_as[name] = callbacks --- for removal - return true -end - ---- string -> bool -local remove_processor = function (name) - local callbacks = registered_as[name] - if callbacks then - for i=1, #callbacks do - luatexbase.remove_from_callback(callbacks[i], name) - end - return true - end - return false --> unregistered -end - ---- now for the simplistic variant ---- unit -> bool -local enablefontkerning = function ( ) - return add_processor( kernfont.handler - , "typesetters.kernfont" - , "pre_linebreak_filter" - , "hpack_filter") -end - ---- unit -> bool -local disablefontkerning = function ( ) - return remove_processor "typesetters.kernfont" -end - ---- fontwise kerning uses a font property for passing along the ---- letterspacing factor - -local fontkerning_enabled = false --- callback state - ---- fontobj -> float -> unit -local initializefontkerning = function (tfmdata, factor) - if factor ~= "max" then - factor = tonumber(factor) or 0 - end - if factor == "max" or factor ~= 0 then - local fontproperties = tfmdata.properties - if fontproperties then - --- hopefully this field stays unused otherwise - fontproperties.kerncharacters = factor - end - if not fontkerning_enabled then - fontkerning_enabled = enablefontkerning() - end - end -end - ---- like the font colorization, fontwise kerning is hooked into the ---- feature mechanism - -otffeatures.register { - name = "kernfactor", - description = "kernfactor", - initializers = { - base = initializefontkerning, - node = initializefontkerning, - } -} - ---[[doc-- - - The “letterspace” feature is essentially identical with the above - “kernfactor” method, but scales the factor to percentages to match - Xetex’s behavior. (See the Xetex reference, page 5, section 1.2.2.) - - Since Xetex doesn’t appear to have a (documented) “max” keyword, we - assume all input values are numeric. - ---doc]]-- - -local initializecompatfontkerning = function (tfmdata, percentage) - local factor = tonumber (percentage) - if not factor then - logs.names_report ("both", 0, "letterspace", - "Invalid argument to letterspace: %s (type %q), " .. - "was expecting percentage as Lua number instead.", - percentage, type (percentage)) - return - end - return initializefontkerning (tfmdata, factor * 0.01) -end - -otffeatures.register { - name = "letterspace", - description = "letterspace", - initializers = { - base = initializecompatfontkerning, - node = initializecompatfontkerning, - } -} - ------------------------------------------------------------------------ ---- erase fake Context layer ------------------------------------------------------------------------ - -attributes = nil ---commands = nil --- used in lualibs -storage = nil --- not to confuse with utilities.storage -nodes.tasks = nil - -collectgarbage"collect" - ---[[example-- - -See https://bitbucket.org/phg/lua-la-tex-tests/src/tip/pln-letterspace-8-compare.tex -for an example. - ---example]]-- - --- vim:ts=2:sw=2:expandtab |