diff options
Diffstat (limited to 'Master/texmf-dist/tex/context/base/attr-eff.lua')
-rw-r--r-- | Master/texmf-dist/tex/context/base/attr-eff.lua | 97 |
1 files changed, 97 insertions, 0 deletions
diff --git a/Master/texmf-dist/tex/context/base/attr-eff.lua b/Master/texmf-dist/tex/context/base/attr-eff.lua new file mode 100644 index 00000000000..023d1c51b53 --- /dev/null +++ b/Master/texmf-dist/tex/context/base/attr-eff.lua @@ -0,0 +1,97 @@ +if not modules then modules = { } end modules ['attr-eff'] = { + version = 1.001, + comment = "companion to attr-eff.mkiv", + author = "Hans Hagen, PRAGMA-ADE, Hasselt NL", + copyright = "PRAGMA ADE / ConTeXt Development Team", + license = "see context related readme files" +} + +local format = string.format + +local attributes, nodes = attributes, nodes + +local states = attributes.states +local tasks = nodes.tasks +local nodeinjections = backends.nodeinjections +local settexattribute = tex.setattribute +local allocate = utilities.storage.allocate +local setmetatableindex = table.setmetatableindex + +attributes.effects = attributes.effects or { } +local effects = attributes.effects + +local a_effect = attributes.private('effect') + +effects.data = allocate() +effects.values = effects.values or { } +effects.registered = effects.registered or { } +effects.attribute = a_effect + +storage.register("attributes/effects/registered", effects.registered, "attributes.effects.registered") +storage.register("attributes/effects/values", effects.values, "attributes.effects.values") + +local template = "%s:%s:%s" + +local data = effects.data +local registered = effects.registered +local values = effects.values + +-- valid effects: normal inner outer both hidden (stretch,rulethickness,effect) + +local function effect(...) effect = nodeinjections.effect return effect(...) end + +local function extender(effects,key) + if key == "none" then + local d = effect(0,0,0) + effects.none = d + return d + end +end + +local function reviver(data,n) + local e = values[n] -- we could nil values[n] now but hardly needed + local d = effect(e[1],e[2],e[3]) + data[n] = d + return d +end + +setmetatableindex(effects, extender) +setmetatableindex(effects.data, reviver) + +effects.handler = nodes.installattributehandler { + name = "effect", + namespace = effects, + initializer = states.initialize, + finalizer = states.finalize, + processor = states.process, +} + +local function register(effect,stretch,rulethickness) + local stamp = format(template,effect,stretch,rulethickness) + local n = registered[stamp] + if not n then + n = #values + 1 + values[n] = { effect, stretch, rulethickness } + registered[stamp] = n + end + return n +end + +local function enable() + tasks.enableaction("shipouts","attributes.effects.handler") +end + +effects.register = register +effects.enable = enable + +-- interface + +local enabled = false + +function commands.triggereffect(effect,stretch,rulethickness) + if not enabled then + enable() + enabled = true + end + settexattribute(a_effect,register(effect,stretch,rulethickness)) +end |