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Diffstat (limited to 'tex/context/base/mkiv/font-vir.lua')
| -rw-r--r-- | tex/context/base/mkiv/font-vir.lua | 206 |
1 files changed, 206 insertions, 0 deletions
diff --git a/tex/context/base/mkiv/font-vir.lua b/tex/context/base/mkiv/font-vir.lua new file mode 100644 index 000000000..03ad7fc85 --- /dev/null +++ b/tex/context/base/mkiv/font-vir.lua @@ -0,0 +1,206 @@ +if not modules then modules = { } end modules ['font-vir'] = { + 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>This is very experimental code! Not yet adapted to recent changes. This will change.</p> +--ldx]]-- + +-- present in the backend but unspecified: +-- +-- vf.rule vf.special vf.right vf.push vf.down vf.char vf.node vf.fontid vf.pop vf.image vf.nop + +local next = next + +local allocate = utilities.storage.allocate +local setmetatableindex = table.setmetatableindex +local fastcopy = table.fastcopy + +local fonts = fonts +local constructors = fonts.constructors +local vf = constructors.handlers.vf +vf.version = 1.000 -- same as tfm + +--[[ldx-- +<p>We overload the <l n='vf'/> reader.</p> +--ldx]]-- + +-- general code / already frozen +-- +-- function vf.find(name) +-- name = file.removesuffix(file.basename(name)) +-- if constructors.resolvevirtualtoo then +-- local format = fonts.loggers.format(name) +-- if format == 'tfm' or format == 'ofm' then +-- if trace_defining then +-- report_defining("locating vf for %a",name) +-- end +-- return findbinfile(name,"ovf") or "" +-- else +-- if trace_defining then +-- report_defining("vf for %a is already taken care of",name) +-- end +-- return "" +-- end +-- else +-- if trace_defining then +-- report_defining("locating vf for %a",name) +-- end +-- return findbinfile(name,"ovf") or "" +-- end +-- end +-- +-- callbacks.register('find_vf_file', vf.find, "locating virtual fonts, insofar needed") -- not that relevant any more + +-- specific code (will move to other module) + +local definers = fonts.definers +local methods = definers.methods + +local variants = allocate() +local combinations = { } +local combiner = { } +local whatever = allocate() +local helpers = allocate() +local predefined = allocate { + dummy = { "comment" }, + push = { "push" }, + pop = { "pop" }, +} + +methods.variants = variants -- todo .. wrong namespace +vf.combinations = combinations +vf.combiner = combiner +vf.whatever = whatever +vf.helpers = helpers +vf.predefined = predefined + +setmetatableindex(whatever, function(t,k) local v = { } t[k] = v return v end) + +local function checkparameters(g,f) + if f and g and not g.parameters and #g.fonts > 0 then + local p = { } + for k,v in next, f.parameters do + p[k] = v + end + g.parameters = p + setmetatable(p, getmetatable(f.parameters)) + end +end + +function methods.install(tag, rules) + vf.combinations[tag] = rules + variants[tag] = function(specification) + return vf.combine(specification,tag) + end +end + +local function combine_load(g,name) + return constructors.readanddefine(name or g.specification.name,g.specification.size) +end + +local function combine_assign(g, name, from, to, start, force) + local f, id = combine_load(g,name) + if f and id then + -- optimize for whole range, then just g = f + if not from then from, to = 0, 0xFF00 end + if not to then to = from end + if not start then start = from end + local fc, gc = f.characters, g.characters + local fd, gd = f.descriptions, g.descriptions + local hn = #g.fonts+1 + g.fonts[hn] = { id = id } -- no need to be sparse + for i=from,to do + if fc[i] and (force or not gc[i]) then + gc[i] = fastcopy(fc[i],true) -- can be optimized + gc[i].commands = { { "slot", hn, start } } + gd[i] = fd[i] + end + start = start + 1 + end + checkparameters(g,f) + end +end + +local function combine_process(g,list) + if list then + for _,v in next, list do + (combiner.commands[v[1]] or nop)(g,v) + end + end +end + +local function combine_names(g,name,force) + local f, id = constructors.readanddefine(name,g.specification.size) + if f and id then + local fc, gc = f.characters, g.characters + local fd, gd = f.descriptions, g.descriptions + g.fonts[#g.fonts+1] = { id = id } -- no need to be sparse + local hn = #g.fonts + for k, v in next, fc do + if force or not gc[k] then + gc[k] = fastcopy(v,true) + gc[k].commands = { { "slot", hn, k } } + gd[i] = fd[i] + end + end + checkparameters(g,f) + end +end + +local combine_feature = function(g,v) + local key, value = v[2], v[3] + if key then + if value == nil then + value = true + end + local specification = g.specification + if specification then + local normalfeatures = specification.features.normal + if normalfeatures then + normalfeatures[key] = value -- otf? + end + end + end +end + +--~ combiner.load = combine_load +--~ combiner.assign = combine_assign +--~ combiner.process = combine_process +--~ combiner.names = combine_names +--~ combiner.feature = combine_feature + +combiner.commands = allocate { + ["initialize"] = function(g,v) combine_assign (g,g.properties.name) end, + ["include-method"] = function(g,v) combine_process (g,combinations[v[2]]) end, -- name + -- ["copy-parameters"] = function(g,v) combine_parameters(g,v[2]) end, -- name + ["copy-range"] = function(g,v) combine_assign (g,v[2],v[3],v[4],v[5],true) end, -- name, from-start, from-end, to-start + ["copy-char"] = function(g,v) combine_assign (g,v[2],v[3],v[3],v[4],true) end, -- name, from, to + ["fallback-range"] = function(g,v) combine_assign (g,v[2],v[3],v[4],v[5],false) end, -- name, from-start, from-end, to-start + ["fallback-char"] = function(g,v) combine_assign (g,v[2],v[3],v[3],v[4],false) end, -- name, from, to + ["copy-names"] = function(g,v) combine_names (g,v[2],true) end, + ["fallback-names"] = function(g,v) combine_names (g,v[2],false) end, + ["feature"] = combine_feature, +} + +function vf.combine(specification,tag) + local g = { + name = specification.name, + properties = { + virtualized = true, + }, + fonts = { + }, + characters = { + }, + descriptions = { + }, + specification = fastcopy(specification), + } + combine_process(g,combinations[tag]) + return g +end |