beta 2009.08.11 23:48

13 files changed, 319 insertions, 35 deletions

diff --git a/tex/context/base/back-pdf.mkiv b/tex/context/base/back-pdf.mkiv
index c635f1c3b..2d3ba8524 100644
--- a/tex/context/base/back-pdf.mkiv
+++ b/tex/context/base/back-pdf.mkiv
@@ -161,7 +161,7 @@
 
 \def\predefinesymbol[#1]%
   {\begingroup
-   \setobject{SYM}{#1}\hbox{\symbol[#1]}%
+   \settightobject{SYM}{#1}\hbox{\symbol[#1]}% to be checked ... maybe only fitting
    \dogetobjectreference{SYM}{#1}\lastref
    \ctxlua{backends.codeinjections.registersymbol("#1",\lastref)}%
    \endgroup}
diff --git a/tex/context/base/java-fld.tex b/tex/context/base/java-fld.tex
index 4fdf41ce4..3c24b7e02 100644
--- a/tex/context/base/java-fld.tex
+++ b/tex/context/base/java-fld.tex
@@ -144,7 +144,6 @@ function Do_Vide_Field ( Name, Closable )
       { ++visible_fields ;
         visible_field[visible_fields] = Name ;
         v.hidden = false ;
-      % v.display = display.visible ;
         if (Closable)
           { v.readonly = false ;
             v.value = "On" }
diff --git a/tex/context/base/java-ini.lua b/tex/context/base/java-ini.lua
index 0fe7d3d29..6dc789e71 100644
--- a/tex/context/base/java-ini.lua
+++ b/tex/context/base/java-ini.lua
@@ -6,6 +6,8 @@ if not modules then modules = { } end modules ['java-ini'] = {
     license   = "see context related readme files"
 }
 
+local format = string.format
+
 javascripts           = javascripts           or { }
 javascripts.codes     = javascripts.codes     or { }
 javascripts.preambles = javascripts.preambles or { }
@@ -96,7 +98,9 @@ function javascripts.code(name,arguments)
     end
     local f = functions[name]
     if f then
-        return string.format("%s(%s)",name,arguments or "")
+        -- temporary hack, i need a more clever approach
+        arguments = '"' .. arguments.gsub(arguments,'%s*,%s*','"%1",') .. '"'
+        return format("%s(%s)",name,arguments or "")
     end
 end
 
diff --git a/tex/context/base/lpdf-fld.lua b/tex/context/base/lpdf-fld.lua
index b9c63347f..6bdfdd36c 100644
--- a/tex/context/base/lpdf-fld.lua
+++ b/tex/context/base/lpdf-fld.lua
@@ -73,6 +73,8 @@ local plus = {
     AutoView        =      256, -- 288 (6+9)
 }
 
+-- todo: check what is interfaced
+
 flag.readonly    = flag.ReadOnly
 flag.required    = flag.Required
 flag.protected   = flag.Password
@@ -86,7 +88,7 @@ plus.hidden      = plus.Hidden
 plus.printable   = plus.Printable
 plus.auto        = plus.AutoView
 
--- some day .. lpeg with function
+-- some day .. lpeg with function or table
 
 local function fieldflag(specification)
     local o, n = specification.options, 0
@@ -101,7 +103,7 @@ end
 local function fieldplus(specification)
     local o, n = specification.options, 0
     if o and o ~= "" then
-        for p in gmatch(o,"[^, ]") do
+        for p in gmatch(o,"[^, ]+") do
             n = n + (plus[p] or 0)
         end
     end
@@ -117,11 +119,12 @@ local function checked(what)
 end
 
 local function fieldactions(specification) -- share actions
+--~ print(table.serialize(specification))
     local d, a = { }, nil
     a = specification.mousedown         if a and a ~= "" then d.D  = checked(a) end
     a = specification.mouseup           if a and a ~= "" then d.U  = checked(a) end
-    a = specification.enterregion       if a and a ~= "" then d.E  = checked(a) end
-    a = specification.exitregion        if a and a ~= "" then d.X  = checked(a) end
+    a = specification.regionin          if a and a ~= "" then d.E  = checked(a) end -- Enter
+    a = specification.regionout         if a and a ~= "" then d.X  = checked(a) end -- eXit
     a = specification.afterkeystroke    if a and a ~= "" then d.K  = checked(a) end
     a = specification.formatresult      if a and a ~= "" then d.F  = checked(a) end
     a = specification.validateresult    if a and a ~= "" then d.V  = checked(a) end
@@ -218,9 +221,8 @@ local function fieldappearances(specification)
     return lpdf.sharedobj(tostring(appearance))
 end
 
-local function fieldstates(specification)
-    -- splitter not needed, wil go
-    -- todo: caching
+local function fieldstates(specification,forceyes)
+    -- we don't use Opt here (too messy for radio buttons)
     local values, default = specification.values, specification.default
     if not values then
         -- error
@@ -263,15 +265,16 @@ local function fieldstates(specification)
     if not offvalue then
         offvalue = offn
     end
+    forceyes = forceyes and "On" -- spec likes Yes more but we've used On for ages now
     if default == yesn then
-        default = pdfconstant(yesn)
+        default = pdfconstant(forceyes or yesn)
     else
         default = pdfconstant("Off")
     end
-    local appearance = pdfdictionary { -- mayeb also cache components
-        N = pdfdictionary { [yesn] = registeredsymbol(yesn), Off = registeredsymbol(offn) },
-        R = pdfdictionary { [yesr] = registeredsymbol(yesr), Off = registeredsymbol(offr) },
-        D = pdfdictionary { [yesd] = registeredsymbol(yesd), Off = registeredsymbol(offd) }
+    local appearance = pdfdictionary { -- maybe also cache components
+        N = pdfdictionary { [forceyes or yesn] = registeredsymbol(yesn), Off = registeredsymbol(offn) },
+        R = pdfdictionary { [forceyes or yesr] = registeredsymbol(yesr), Off = registeredsymbol(offr) },
+        D = pdfdictionary { [forceyes or yesd] = registeredsymbol(yesd), Off = registeredsymbol(offd) }
     }
     local appearanceref = lpdf.sharedobj(tostring(appearance))
     return appearanceref, default
@@ -630,14 +633,15 @@ function methods.combo(name,specification)
     methods.choice(name,specification,"PopUp,Edit")
 end
 
--- probably no default appearance needed for first kid
+-- Probably no default appearance needed for first kid and no javascripts for the
+-- parent ... I will look into it when I have to make a complex document.
 
 function methods.check(name,specification)
     -- no /Opt because (1) it's messy - see pdf spec, (2) it discouples kids and
     -- contrary to radio there is no way to associate then
     local field = fields[name]
     local kind = field.kind
-    local appearance, default = fieldstates(field)
+    local appearance, default = fieldstates(field,true)
     if not field.pobj then
         local d = pdfdictionary {
             Subtype  = pdf_widget,
diff --git a/tex/context/base/lpdf-ini.lua b/tex/context/base/lpdf-ini.lua
index 1b099ed9b..753b09180 100644
--- a/tex/context/base/lpdf-ini.lua
+++ b/tex/context/base/lpdf-ini.lua
@@ -168,7 +168,7 @@ local tostring_z = function()  return "null"          end
 local tostring_t = function()  return "true"          end
 local tostring_f = function()  return "false"         end
 local tostring_r = function(t) return t[1] .. " 0 R"  end
-local tostring_v = function(t) return concat(t, "")   end
+local tostring_v = function(t) return concat(t[1],"") end
 
 local function value_x(t)     return t                      end -- the call is experimental
 local function value_s(t,key) return t[1]                   end -- the call is experimental
diff --git a/tex/context/base/lpdf-mis.lua b/tex/context/base/lpdf-mis.lua
index 87230aff2..e3ed8919d 100644
--- a/tex/context/base/lpdf-mis.lua
+++ b/tex/context/base/lpdf-mis.lua
@@ -71,11 +71,11 @@ lpdf.registerdocumentfinalizer(initializeoverprint)
 
 function codeinjections.addtransparencygroup()
     -- png: /CS /DeviceRGB /I true
-    local d = tostring ( pdfdictionary {
+    local d = pdfdictionary {
         S = pdfconstant("Transparency"),
         I = true,
         K = true,
-    } )
+    }
     lpdf.registerpagefinalizer(function() lpdf.addtopageattributes("Group",d) end)
 end
 
diff --git a/tex/context/base/lpdf-wid.lua b/tex/context/base/lpdf-wid.lua
index cc61a4f96..c87192b3a 100644
--- a/tex/context/base/lpdf-wid.lua
+++ b/tex/context/base/lpdf-wid.lua
@@ -241,7 +241,7 @@ local function insertrenderingwindow(label,width,height,specification)
         AA      = actions,
     }
     local r = pdfreserveobj("annot")
-    node.write(nodes.pdfannot(label,width,height,d(),r)) -- save ref
+    node.write(nodes.pdfannot(width,height,0,d(),r)) -- save ref
     return pdfreference(r)
 end
 
diff --git a/tex/context/base/lxml-ini.mkiv b/tex/context/base/lxml-ini.mkiv
index 494e4f0b7..34a14f9d9 100644
--- a/tex/context/base/lxml-ini.mkiv
+++ b/tex/context/base/lxml-ini.mkiv
@@ -109,7 +109,7 @@
 \let\xmlgrab\xmlsetsetup
 
 \def\xmlsetup#1#2%              % we pass the reference so that we have access to the frozen number
-  {\def\xmlself{#1}%            % by using #1 inside a setup
+  {\def\xmlself{#1}%            % by using #1 inside a setup; maybe self becomes obsolete
    \setupwithargument{#2}{#1}}
 
 \newtoks \registeredxmlsetups
diff --git a/tex/context/base/m-punk.tex b/tex/context/base/m-punk.tex
new file mode 100644
index 000000000..3b1baa75b
--- /dev/null
+++ b/tex/context/base/m-punk.tex
@@ -0,0 +1,232 @@
+%D \module
+%D   [       file=m-punk,
+%D        version=2008.04.15,
+%D          title=\CONTEXT\ Modules,
+%D       subtitle=Punk Support,
+%D         author=Hans Hagen,
+%D           date=\currentdate,
+%D      copyright=PRAGMA]
+%C
+%C This module is part of the \CONTEXT\ macro||package and is
+%C therefore copyrighted by \PRAGMA. See mreadme.pdf for
+%C details.
+
+\ifx\luaversion\undefined \endinput \fi
+
+% At some point the font generation code will move into the
+% ConTeXt MkIV kernel.
+
+\startluacode
+do
+    local concat   = table.concat
+    local chardata = characters.data
+    local fontdata = fonts.ids
+
+    fonts.mp = fonts.mp or { }
+
+    fonts.mp.version = fonts.mp.version or 1.11
+    fonts.mp.inline  = true
+    fonts.mp.cache   = containers.define("fonts", "mp", fonts.mp.version, true)
+
+    metapost.characters = metapost.characters or { }
+
+-- todo: use table share as in otf
+
+    local characters, descriptions = { }, { }
+    local factor, l, n, w, h, d, total, variants = 100, { }, 0, 0, 0, 0, 0, 0, true
+
+    -- A next version of mplib will provide the tfm font information which
+    -- gives better glyph dimensions, plus additional kerning information.
+
+    local flusher = {
+        startfigure = function(chrnum,llx,lly,urx,ury)
+            l, n = { }, chrnum
+            w, h, d = urx - llx, ury, -lly
+            total = total + 1
+            inline = fonts.mp.inline
+        end,
+        flushfigure = function(t)
+            for i=1, #t do
+                l[#l+1] = t[i]
+            end
+        end,
+        stopfigure = function()
+            local cd = chardata[n]
+            if inline then
+                descriptions[n] = {
+                --  unicode = n,
+                    name = cd and cd.adobename,
+                    width = w*100,
+                    height = h*100,
+                    depth = d*100,
+                    boundingbox = { 0, -d, w, h },
+                }
+                characters[n] = {
+                    commands = { -- todo: xforms, should happen in backend
+                        { "special", "pdf: " .. concat(l," ") },
+                    }
+                }
+            else
+                descriptions[n] = {
+                --  unicode = n,
+                    name = cd and cd.adobename,
+                    width = w*100,
+                    height = h*100,
+                    depth = d*100,
+                    boundingbox = { 0, -d, w, h },
+                }
+                characters[n] = {
+                    commands = {
+                        { "image", { stream = concat(l," "), bbox = { 0, -d*65536, w*65536, h*65536 } } },
+                    }
+                }
+            end
+        end
+    }
+
+    metapost.characters.instances = metapost.characters.instances or 10
+
+    function metapost.characters.process(mpxformat, name, instances, scalefactor)
+        statistics.starttiming(metapost.characters)
+        scalefactor = scalefactor or 1
+        instances = instances or metapost.characters.instances or 10
+        local fontname = file.removesuffix(file.basename(name))
+        local hash  = file.robustname(string.format("%s %05i %03i", fontname, scalefactor*1000, instances))
+        local lists = containers.read(fonts.mp.cache(), hash)
+        if not lists then
+            statistics.starttiming(flusher)
+            -- we can use a format per font
+            local data = io.loaddata(resolvers.find_file(name))
+            metapost.reset(mpxformat)
+            metapost.set_outer_color(2) -- no outer color and no reset either
+            lists = { }
+            for i=1,instances do
+                list = { }
+                characters, descriptions = { }, { }
+                metapost.process(
+                    mpxformat,
+                    {
+                        "randomseed := " .. i*10 .. ";",
+                        "scale_factor := " .. scalefactor .. " ;",
+                        data
+                    },
+                    false,
+                    flusher
+                )
+                lists[i] = {
+                    designsize = 655360,
+                    name = string.format("%s-%03i",hash,i),
+                    parameters = {
+                        slant         =   0,
+                        space         = 333   * scalefactor,
+                        space_stretch = 166.5 * scalefactor,
+                        space_shrink  = 111   * scalefactor,
+                        x_height      = 431   * scalefactor,
+                        quad          =1000   * scalefactor,
+                        extra_space   =   0
+                    },
+                    ["type"] = "virtual",
+                    characters = characters,
+                    descriptions = descriptions,
+                --  embedding = "subset",
+                --  mkiv:
+                    spacer = "space",
+                    unit = 1000,
+                    shared = { },
+                    unique = { },
+                }
+            end
+            metapost.reset(mpxformat) -- saves memory
+            lists = containers.write(fonts.mp.cache(), hash, lists)
+            statistics.stoptiming(flusher)
+        end
+        variants = variants + #lists
+        statistics.stoptiming(metapost.characters)
+        return lists
+    end
+
+    function fonts.vf.aux.combine.commands.metafont(g,v)
+        local size = g.specification.size
+        local data = metapost.characters.process(v[2],v[3],v[4],size/655360)
+        local list, t = { }, { }
+        for d=1,#data do
+            t = data[d]
+            t = fonts.tfm.scale(t, -1000)
+            local id = font.nextid()
+            t.fonts = { { id = id } }
+            fontdata[id] = t
+            fonts.vf.aux.compose_characters(t)
+            list[d] = font.define(t)
+        end
+        for k, v in pairs(t) do
+            g[k] = v -- kind of replace, when not present, make nil
+        end
+        g.virtualized = true
+        g.variants = list
+    end
+
+    fonts.define.methods.install( "punk", {
+        { "metafont", "mfplain", "punkfont.mp", 10 },
+    } )
+
+    cases.actions[99] = function(current)
+        local used = fontdata[current.font].variants
+        if used then
+            local f = math.random(1,#used)
+            current.font = used[f]
+            return current, true
+        else
+            return current, false
+        end
+    end
+
+    metapost.characters.flusher = flusher
+
+    statistics.register("metapost font generation", function()
+        local time = statistics.elapsedtime(flusher)
+        if total > 0 then
+            return string.format("%i glyphs, %.3f seconds runtime, %i glyphs/second", total, time, total/time)
+        else
+            return string.format("%i glyphs, %.3f seconds runtime", total, time)
+        end
+    end)
+
+    statistics.register("metapost font loading",function()
+        local time = statistics.elapsedtime(metapost.characters)
+        if variants > 0 then
+            return string.format("%.3f seconds, %i instances, %0.3f instances/second", time, variants, variants/time)
+        else
+            return string.format("%.3f seconds, %i instances", time, variants)
+        end
+    end)
+
+end
+\stopluacode
+
+\unexpanded\def\EnableRandomPunk {\setcharactercasing[99]}
+\unexpanded\def\RandomPunk       {\groupedcommand\EnableRandomPunk\donothing}
+\unexpanded\def\StartRandomPunk  {\begingroup\EnableRandomPunk}
+\unexpanded\def\StopRandomPunk   {\endgroup}
+
+\starttypescript [serif] [punk] [default]
+    \setups[font:fallback:serif] % no style variants yet
+    \definefontsynonym [Serif] [demo@punk]
+\stoptypescript
+
+\starttypescript [punk]
+    \definetypeface [punk] [rm] [serif] [punk] [default]
+\stoptypescript
+
+\endinput
+
+\usetypescript[punk]
+
+\setupbodyfont[punk,14pt]
+
+\starttext
+    \definedfont[demo@punk at 10pt]hello world\par
+    \definedfont[demo@punk at 12pt]hello world\par
+    \definedfont[demo@punk at 16pt]hello world\par
+    \definedfont[demo@punk at 20pt]hello world\par
+\stoptext
+
diff --git a/tex/context/base/scrn-fld.mkiv b/tex/context/base/scrn-fld.mkiv
index eef6bbe7d..4bcc0eabd 100644
--- a/tex/context/base/scrn-fld.mkiv
+++ b/tex/context/base/scrn-fld.mkiv
@@ -150,6 +150,32 @@
 \def\donormalfield{\doprocessfield\dohandlefield}
 \def\dofitfield   {\doprocessfield\dohandlefitfield}
 
+% \def\doprocessfield#1[#2][#3]% \method [name] [label]
+%   {\dontleavehmode
+%    \begingroup
+%    \loadfieldscripts
+%    \edef\currentfieldname {#2}%
+%    \edef\currentfieldlabel{#3}%
+%    \edef\currentfieldgroup{\ctxlua{backends.codeinjections.getfieldgroup("#2")}}%
+%    \ifx\currentfieldlabel\empty
+%      \let\currentfieldlabel\currentfieldname
+%    \fi
+%    \ifx\currentfieldgroup\empty
+%      #1[#2][\v!label,\v!frame,\v!horizontal][][][]%
+%    \else
+%      \getvalue{\??fd::\currentfieldgroup}%
+%      #1[#2][][][][]% todo: pass setups
+%    \fi
+%    \endgroup}
+
+% \def\dosetupfieldindeed#1#2[#3][#4][#5][#6][#7]%
+%   {#1[#2][#4][#5][#6][#7]}
+%
+% equals:
+
+\def\dosetupfieldindeed#1#2[#3]% [#4][#5][#6][#7]%
+  {#1[#2]} % [#4][#5][#6][#7]}
+
 \def\doprocessfield#1[#2][#3]% \method [name] [label]
   {\dontleavehmode
    \begingroup
@@ -163,7 +189,8 @@
    \ifx\currentfieldgroup\empty
      #1[#2][\v!label,\v!frame,\v!horizontal][][][]%
    \else
-     #1[#2][][][][]% todo: pass setups
+     \def\dosetupfield{\dosetupfieldindeed{#1}{#2}}%
+     \getvalue{\??fd::\currentfieldgroup}%
    \fi
    \endgroup}
 
@@ -246,11 +273,11 @@
        \v!horizontal=>\HorizontalFieldtrue,
          \v!vertical=>\VerticalFieldtrue]%
    \ifVerticalField
-     \getparameters[\??fd][\c!distance=\!!zeropoint,\c!inbetween=\vskip\@@localoffset,\c!align=\v!right,\c!width=20em]%
+     \getparameters[\??fd][\c!distance=\zeropoint,\c!inbetween=\vskip\@@localoffset,\c!align=\v!right,\c!width=20em]%
    \else\ifHorizontalField
      \getparameters[\??fd][\c!distance=\@@localoffset,\c!inbetween=,\c!align=\c!left,\c!height=10ex]%
    \else
-     \getparameters[\??fd][\c!distance=\!!zeropoint,\c!inbetween=,\c!align=\c!left]%
+     \getparameters[\??fd][\c!distance=\zeropoint,\c!inbetween=,\c!align=\c!left]%
    \fi\fi
    \getparameters[\??fd][\c!n=,\c!before=,\c!after=\vss,\c!style=,\c!color=,#3]%
    \ifShowFieldFrame
@@ -283,7 +310,7 @@
               \c!clickin=,\c!clickout=,\c!regionin=,\c!regionout=,
               \c!afterkey=,\c!format=,\c!validate=,\c!calculate=,
               \c!focusin=,\c!focusout=,
-              \c!fieldoffset=\!!zeropoint,\c!fieldbackgroundcolor=,
+              \c!fieldoffset=\zeropoint,\c!fieldbackgroundcolor=,
               \c!fieldframecolor=,\c!fieldlayer=\@@iafieldlayer,#5]%
             \scratchdimen\framedwidth \edef\@@fdwidth {\the\scratchdimen}%
             \scratchdimen\framedheight\edef\@@fdheight{\the\scratchdimen}%
@@ -324,11 +351,11 @@
       \c!clickin=,\c!clickout=,\c!regionin=,\c!regionout=,
       \c!focusin=,\c!focusout=,
       \c!afterkey=,\c!format=,\c!validate=,\c!calculate=,
-      \c!fieldoffset=\!!zeropoint,\c!fieldbackgroundcolor=,
+      \c!fieldoffset=\zeropoint,\c!fieldbackgroundcolor=,
       \c!fieldframecolor=,\c!fieldlayer=\@@iafieldlayer,#5,\c!align=]
      {\edef\defaultfield{\ctxlua{backends.codeinjections.getdefaultfieldvalue("#1")}}%
-\dopresetsymbol\defaultfield
-\setbox\scratchbox\hbox{\dogetsymbol\defaultfield}%
+    % \dopresetsymbol\defaultfield
+    \setbox\scratchbox\hbox{\symbol[\defaultfield]}%
       \edef\@@fdwidth {\the\wd\scratchbox}%
       \ifcase\fitfieldmode
         \edef\@@fdheight{\the\ht\scratchbox}%
@@ -376,7 +403,7 @@
       \setupfield
         [systemfield]
         [\c!n=1024, % beware: weblink plugin truncates
-         \c!location=\v!low,\c!strut=\v!yes,\c!fieldoffset=0pt,
+         \c!location=\v!low,\c!strut=\v!yes,\c!fieldoffset=\zeropoint,
          \c!height=1.2\openlineheight,\c!width=\dimen0,\c!offset=\v!overlay,
          \c!style=,\c!align=\v!middle,\c!frame=\v!off,
          \c!color=red,\c!fieldbackgroundcolor=\s!white,\c!fieldframecolor=blue,
@@ -438,7 +465,7 @@
          {\fitfield[\currentsystemfield:but]}%
       #2}%
   \ht0\strutht\dp0\strutdp\box0
-  \enfgroup}
+  \endgroup}
 
 %D And one more:
 
diff --git a/tex/context/base/supp-mps.mkii b/tex/context/base/supp-mps.mkii
index 9864cd9a1..3629ccf0b 100644
--- a/tex/context/base/supp-mps.mkii
+++ b/tex/context/base/supp-mps.mkii
@@ -1174,8 +1174,8 @@
 
   \ifx\undefined\interactionmode \chardef\interactionmode=255 \fi
 
-  \def\MPOSTbatchswitch   {-int=batchmode}
-  \def\MPOSTnonstopswitch {-int=nonstopmode}
+  \def\MPOSTbatchswitch   {-interaction=batchmode}   % was -int, but newer mpost does not support partial flags
+  \def\MPOSTnonstopswitch {-interaction=nonstopmode} % was -int, but newer mpost does not support partial flags
   \def\MPOSTformatswitch  {-progname=metafun -mem=}
   \def\MPOSTdriver        {dvips}
 
diff --git a/tex/context/base/syst-aux.mkiv b/tex/context/base/syst-aux.mkiv
index d650e4513..7b119f578 100644
--- a/tex/context/base/syst-aux.mkiv
+++ b/tex/context/base/syst-aux.mkiv
@@ -1842,7 +1842,8 @@
 \def\undoassign[#1][#2]{\let\setsomevalue\doresetvalue\p!doassign#1\@relax@#2==\empty\@relax@}
 
 %D \macros
-%D   {processassignmentlist,processassignmentcommand}
+%D   {processassignmentlist,processassignmentcommand,
+%D    startprocessassignmentlist,startprocessassignmentcommand}
 %D
 %D For Wolfgang:
 %D
@@ -1861,6 +1862,14 @@
 \def\processassignmentcommand[#1]%
   {\normalexpanded{\noexpand\processassignmentlist[#1]}}
 
+\long\def\startprocessassignmentlist[#1]#2\stopprocessassignmentlist
+  {\long\def\currentassignmentlistcommand##1##2{\def\currentassignmentlistkey{##1}\def\currentassignmentlistvalue{##2}#2}%
+   \processassignmentlist[#1]\currentassignmentlistcommand}
+
+\long\def\startprocessassignmentcommand[#1]#2\stopprocessassignmentcommand
+  {\long\def\currentassignmentlistcommand##1##2{\def\currentassignmentlistkey{##1}\def\currentassignmentlistvalue{##2}#2}%
+   \normalexpanded{\noexpand\processassignmentlist[#1]}\currentassignmentlistcommand}
+
 %D \macros{currentvalue}
 %D
 %D Just in case a \type{\getparameter} argument itself ends up
diff --git a/tex/context/base/syst-gen.mkii b/tex/context/base/syst-gen.mkii
index 2db71650f..65a501360 100644
--- a/tex/context/base/syst-gen.mkii
+++ b/tex/context/base/syst-gen.mkii
@@ -2911,7 +2911,8 @@
   {\ifundefined{#1#2}\dosetvalue{#1}{#2}{#3}\fi}
 
 %D \macros
-%D   {processassignmentlist,processassignmentcommand}
+%D   {processassignmentlist,processassignmentcommand,
+%D    startprocessassignmentlist,startprocessassignmentcommand}
 %D
 %D For Wolfgang:
 %D
@@ -2927,6 +2928,14 @@
 \def\processassignmentcommand[#1]%
   {\normalexpanded{\noexpand\processassignmentlist[#1]}}
 
+\long\def\startprocessassignmentlist[#1]#2\stopprocessassignmentlist
+  {\long\def\currentassignmentlistcommand##1##2{\def\currentassignmentlistkey{##1}\def\currentassignmentlistvalue{##2}#2}%
+   \processassignmentlist[#1]\currentassignmentlistcommand}
+
+\long\def\startprocessassignmentcommand[#1]#2\stopprocessassignmentcommand
+  {\long\def\currentassignmentlistcommand##1##2{\def\currentassignmentlistkey{##1}\def\currentassignmentlistvalue{##2}#2}%
+   \normalexpanded{\noexpand\processassignmentlist[#1]}\currentassignmentlistcommand}
+
 %D \macros
 %D   {getparameters,geteparameters,getgparameters,
 %D    forgetparameters}