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Diffstat (limited to 'tex/context/base/mkiv/attr-lay.lua')
| -rw-r--r-- | tex/context/base/mkiv/attr-lay.lua | 307 |
1 files changed, 307 insertions, 0 deletions
diff --git a/tex/context/base/mkiv/attr-lay.lua b/tex/context/base/mkiv/attr-lay.lua new file mode 100644 index 000000000..0d43979c8 --- /dev/null +++ b/tex/context/base/mkiv/attr-lay.lua @@ -0,0 +1,307 @@ +if not modules then modules = { } end modules ['attr-lay'] = { + version = 1.001, + comment = "companion to attr-lay.mkiv", + author = "Hans Hagen, PRAGMA-ADE, Hasselt NL", + copyright = "PRAGMA ADE / ConTeXt Development Team", + license = "see context related readme files" +} + +-- layers (ugly code, due to no grouping and such); currently we use exclusive layers +-- but when we need it stacked layers might show up too; the next function based +-- approach can be replaced by static (metatable driven) resolvers + +-- maybe use backends.registrations here too + +local type = type +local insert, remove = table.insert, table.remove + +local attributes = attributes +local nodes = nodes +local utilities = utilities +local logs = logs +local backends = backends + +local context = context +local interfaces = interfaces +local tex = tex + +local implement = interfaces.implement + +local allocate = utilities.storage.allocate +local setmetatableindex = table.setmetatableindex +local formatters = string.formatters + +local report_viewerlayers = logs.reporter("viewerlayers") + +-- todo: document this but first reimplement this as it reflects the early +-- days of luatex / mkiv and we have better ways now + +-- nb: attributes: color etc is much slower than normal (marks + literals) but ... +-- nb. too many "0 g"s +-- nb: more local tables + +attributes.viewerlayers = attributes.viewerlayers or { } +local viewerlayers = attributes.viewerlayers + +local variables = interfaces.variables +local v_local = variables["local"] +local v_global = variables["global"] +local v_start = variables["start"] +local v_yes = variables["yes"] + +local a_viewerlayer = attributes.private("viewerlayer") + +viewerlayers = viewerlayers or { } +viewerlayers.data = allocate() +viewerlayers.registered = viewerlayers.registered or { } +viewerlayers.values = viewerlayers.values or { } +viewerlayers.scopes = viewerlayers.scopes or { } +viewerlayers.listwise = allocate() +viewerlayers.attribute = a_viewerlayer +viewerlayers.supported = true +viewerlayers.hasorder = true + +local states = attributes.states +local tasks = nodes.tasks +local nodeinjections = backends.nodeinjections +local codeinjections = backends.codeinjections + +local texsetattribute = tex.setattribute +local texgetattribute = tex.getattribute +local texsettokenlist = tex.settoks +local unsetvalue = attributes.unsetvalue + +local nodepool = nodes.pool + +local data = viewerlayers.data +local values = viewerlayers.values +local listwise = viewerlayers.listwise +local registered = viewerlayers.registered +local scopes = viewerlayers.scopes + +local f_stamp = formatters["%s"] + +storage.register("attributes/viewerlayers/registered", registered, "attributes.viewerlayers.registered") +storage.register("attributes/viewerlayers/values", values, "attributes.viewerlayers.values") +storage.register("attributes/viewerlayers/scopes", scopes, "attributes.viewerlayers.scopes") + +local layerstacker = utilities.stacker.new("layers") -- experiment + +layerstacker.mode = "stack" +layerstacker.unset = attributes.unsetvalue + +viewerlayers.resolve_reset = layerstacker.resolve_reset +viewerlayers.resolve_begin = layerstacker.resolve_begin +viewerlayers.resolve_step = layerstacker.resolve_step +viewerlayers.resolve_end = layerstacker.resolve_end + +-- stacked + +local function startlayer(...) startlayer = nodeinjections.startlayer return startlayer(...) end +local function stoplayer (...) stoplayer = nodeinjections.stoplayer return stoplayer (...) end + +local function extender(viewerlayers,key) + if viewerlayers.supported and key == "none" then + local d = stoplayer() + viewerlayers.none = d + return d + end +end + +local function reviver(data,n) + if viewerlayers.supported then + local v = values[n] + if v then + local d = startlayer(v) + data[n] = d + return d + else + report_viewerlayers("error: unknown reference %a",tostring(n)) + end + end +end + +setmetatableindex(viewerlayers,extender) +setmetatableindex(viewerlayers.data,reviver) + +-- !!!! TEST CODE !!!! + +layerstacker.start = function(...) local f = nodeinjections.startstackedlayer layerstacker.start = f return f(...) end +layerstacker.stop = function(...) local f = nodeinjections.stopstackedlayer layerstacker.stop = f return f(...) end +layerstacker.change = function(...) local f = nodeinjections.changestackedlayer layerstacker.change = f return f(...) end + +local function initializer(...) + return states.initialize(...) +end + +attributes.viewerlayers.handler = nodes.installattributehandler { + name = "viewerlayer", + namespace = viewerlayers, + initializer = initializer, + finalizer = states.finalize, + processor = states.stacker, + -- processor = states.stacked, +} + +local stack, enabled, global = { }, false, false + +function viewerlayers.enable(value) + if value == false or not viewerlayers.supported then + if enabled then + tasks.disableaction("shipouts","attributes.viewerlayers.handler") + end + enabled = false + else + if not enabled then + tasks.enableaction("shipouts","attributes.viewerlayers.handler") + end + enabled = true + end +end + +function viewerlayers.forcesupport(value) + viewerlayers.supported = value + report_viewerlayers("viewerlayers are %ssupported",value and "" or "not ") + viewerlayers.enable(value) +end + +local function register(name,lw) -- if not inimode redefine data[n] in first call + if not enabled then + viewerlayers.enable(true) + end + local stamp = f_stamp(name) + local n = registered[stamp] + if not n then + n = #values + 1 + values[n] = name + registered[stamp] = n + listwise[n] = lw or false -- lw forces a used + end + return registered[stamp] -- == n +end + +viewerlayers.register = register + +function viewerlayers.setfeatures(hasorder) + viewerlayers.hasorder = hasorder +end + +local usestacker = true -- new, experimental + +function viewerlayers.start(name) + local a + if usestacker then + a = layerstacker.push(register(name) or unsetvalue) + else + insert(stack,texgetattribute(a_viewerlayer)) + a = register(name) or unsetvalue + end + if global or scopes[name] == v_global then + scopes[a] = v_global -- messy but we don't know the attributes yet + texsetattribute("global",a_viewerlayer,a) + else + texsetattribute(a_viewerlayer,a) + end + texsettokenlist("currentviewerlayertoks",name) +end + +function viewerlayers.stop() + local a + if usestacker then + a = layerstacker.pop() + else + a = remove(stack) + end + if not a then + -- error + elseif a >= 0 then + if global or scopes[a] == v_global then + texsetattribute("global",a_viewerlayer,a) + else + texsetattribute(a_viewerlayer,a) + end + texsettokenlist("currentviewerlayertoks",values[a] or "") + else + if global or scopes[a] == v_global then + texsetattribute("global",a_viewerlayer,unsetvalue) + else + texsetattribute(a_viewerlayer,unsetvalue) + end + texsettokenlist("currentviewerlayertoks","") + end +end + +function viewerlayers.define(settings) + local tag = settings.tag + if not tag or tag == "" then + -- error + elseif not scopes[tag] then -- prevent duplicates + local title = settings.title + if not title or title == "" then + settings.title = tag + end + scopes[tag] = settings.scope or v_local + codeinjections.defineviewerlayer(settings) + end +end + +function viewerlayers.definedlayoutcomponent(tag) + viewerlayers.define { + tag = tag, + title = utilities.strings.nice(tag), + visible = v_start, + editable = v_yes, + printable = v_yes, + } + return register(tag,true) -- true forces a use +end + +function viewerlayers.cleanup() + layerstacker.clean() + -- todo +end + +implement { + name = "cleanuplayers", + actions = viewerlayers.cleanup +} + +implement { + name = "defineviewerlayer", + actions = viewerlayers.define, + arguments = { + { + { "tag" }, + { "title" }, + { "visible" }, + { "editable" }, + { "export" }, + { "printable" }, + { "scope" }, + }, + true + } +} + +implement { + name = "definedlayoutcomponent", + actions = { viewerlayers.definedlayoutcomponent, context }, + arguments = "string" +} + +implement { + name = "startviewerlayer", + actions = viewerlayers.start, + arguments = "string", +} + +implement { + name = "stopviewerlayer", + actions = viewerlayers.stop +} + +implement { + name = "registeredviewerlayer", + actions = { register, context }, + arguments = { "string", true } -- true forces a use +} |