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-rw-r--r--luaotfload-extralibs.lua300
1 files changed, 0 insertions, 300 deletions
diff --git a/luaotfload-extralibs.lua b/luaotfload-extralibs.lua
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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