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+if not modules then modules = { } end modules ['lpdf-fld'] = {
+ version = 1.001,
+ comment = "companion to lpdf-ini.mkiv",
+ author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
+ copyright = "PRAGMA ADE / ConTeXt Development Team",
+ license = "see context related readme files"
+}
+
+-- TURN OFF: preferences -> forms -> highlight -> etc
+
+-- The problem with widgets is that so far each version of acrobat has some
+-- rendering problem. I tried to keep up with this but it makes no sense to do so as
+-- one cannot rely on the viewer not changing. Especially Btn fields are tricky as
+-- their appearences need to be synchronized in the case of children but e.g.
+-- acrobat 10 does not retain the state and forces a check symbol. If you make a
+-- file in acrobat then it has MK entries that seem to overload the already present
+-- appearance streams (they're probably only meant for printing) as it looks like
+-- the viewer has some fallback on (auto generated) MK behaviour built in. So ...
+-- hard to test. Unfortunately not even the default appearance is generated. This
+-- will probably be solved at some point.
+--
+-- Also, for some reason the viewer does not always show custom appearances when
+-- fields are being rolled over or clicked upon, and circles or checks pop up when
+-- you don't expect them. I fear that this kind of instability eventually will kill
+-- pdf forms. After all, the manual says: "individual annotation handlers may ignore
+-- this entry and provide their own appearances" and one might wonder what
+-- 'individual' means here, but effectively this renders the whole concept of
+-- appearances useless.
+--
+-- Okay, here is one observation. A pdf file contains objects and one might consider
+-- each one to be a static entity when read in. However, acrobat starts rendering
+-- and seems to manipulate (appearance streams) of objects in place (this is visible
+-- when the file is saved again). And, combined with some other caching and hashing,
+-- this might give side effects for shared objects. So, it seems that for some cases
+-- one can best be not too clever and not share but duplicate information. Of course
+-- this defeats the whole purpose of these objects. Of course I can be wrong.
+--
+-- A rarther weird side effect of the viewer is that the highlighting of fields
+-- obscures values, unless you uses one of the BS variants, and this makes custum
+-- appearances rather useless as there is no way to control this apart from changing
+-- the viewer preferences. It could of course be a bug but it would be nice if the
+-- highlighting was at least transparent. I have no clue why the built in shapes
+-- work ok (some xform based appearances are generated) while equally valid other
+-- xforms fail. It looks like acrobat appearances come on top (being refered to in
+-- the MK) while custom ones are behind the highlight rectangle. One can disable the
+-- "Show border hover color for fields" option in the preferences. If you load
+-- java-imp-rhh this side effect gets disabled and you get what you expect (it took
+-- me a while to figure out this hack).
+--
+-- When highlighting is enabled, those default symbols flash up, so it looks like we
+-- have some inteference between this setting and custom appearances.
+--
+-- Anyhow, the NeedAppearances is really needed in order to get a rendering for
+-- printing especially when highlighting (those colorfull foregrounds) is on.
+
+local tostring, tonumber, next = tostring, tonumber, next
+local gmatch, lower, format, formatters = string.gmatch, string.lower, string.format, string.formatters
+local lpegmatch = lpeg.match
+local bpfactor, todimen = number.dimenfactors.bp, string.todimen
+local sortedhash = table.sortedhash
+local trace_fields = false trackers.register("backends.fields", function(v) trace_fields = v end)
+
+local report_fields = logs.reporter("backend","fields")
+
+local backends, lpdf = backends, lpdf
+
+local variables = interfaces.variables
+local context = context
+
+local references = structures.references
+local settings_to_array = utilities.parsers.settings_to_array
+
+local pdfbackend = backends.pdf
+
+local nodeinjections = pdfbackend.nodeinjections
+local codeinjections = pdfbackend.codeinjections
+local registrations = pdfbackend.registrations
+
+local registeredsymbol = codeinjections.registeredsymbol
+
+local pdfstream = lpdf.stream
+local pdfdictionary = lpdf.dictionary
+local pdfarray = lpdf.array
+local pdfreference = lpdf.reference
+local pdfunicode = lpdf.unicode
+local pdfstring = lpdf.string
+local pdfconstant = lpdf.constant
+local pdfaction = lpdf.action
+
+local pdfflushobject
+local pdfshareobjectreference
+local pdfshareobject
+local pdfreserveobject
+local pdfpagereference
+local pdfmajorversion
+
+updaters.register("backend.update.lpdf",function()
+ pdfflushobject = lpdf.flushobject
+ pdfshareobjectreference = lpdf.shareobjectreference
+ pdfshareobject = lpdf.shareobject
+ pdfreserveobject = lpdf.reserveobject
+ pdfpagereference = lpdf.pagereference
+ pdfmajorversion = lpdf.majorversion
+end)
+
+local pdfcolor = lpdf.color
+local pdfcolorvalues = lpdf.colorvalues
+local pdflayerreference = lpdf.layerreference
+
+local hpack_node = node.hpack
+
+local submitoutputformat = 0 -- 0=unknown 1=HTML 2=FDF 3=XML => not yet used, needs to be checked
+
+local pdf_widget = pdfconstant("Widget")
+local pdf_tx = pdfconstant("Tx")
+local pdf_sig = pdfconstant("Sig")
+local pdf_ch = pdfconstant("Ch")
+local pdf_btn = pdfconstant("Btn")
+local pdf_yes = pdfconstant("Yes")
+local pdf_off = pdfconstant("Off")
+local pdf_p = pdfconstant("P") -- None Invert Outline Push
+local pdf_n = pdfconstant("N") -- None Invert Outline Push
+--
+local pdf_no_rect = pdfarray { 0, 0, 0, 0 }
+
+local splitter = lpeg.splitat("=>")
+
+local formats = {
+ html = 1, fdf = 2, xml = 3,
+}
+
+function codeinjections.setformsmethod(name)
+ submitoutputformat = formats[lower(name)] or formats.xml
+end
+
+local flag = { -- /Ff
+ ReadOnly = 0x00000001, -- 2^ 0
+ Required = 0x00000002, -- 2^ 1
+ NoExport = 0x00000004, -- 2^ 2
+ MultiLine = 0x00001000, -- 2^12
+ Password = 0x00002000, -- 2^13
+ NoToggleToOff = 0x00004000, -- 2^14
+ Radio = 0x00008000, -- 2^15
+ PushButton = 0x00010000, -- 2^16
+ PopUp = 0x00020000, -- 2^17
+ Edit = 0x00040000, -- 2^18
+ Sort = 0x00080000, -- 2^19
+ FileSelect = 0x00100000, -- 2^20
+ DoNotSpellCheck = 0x00400000, -- 2^22
+ DoNotScroll = 0x00800000, -- 2^23
+ Comb = 0x01000000, -- 2^24
+ RichText = 0x02000000, -- 2^25
+ RadiosInUnison = 0x02000000, -- 2^25
+ CommitOnSelChange = 0x04000000, -- 2^26
+}
+
+local plus = { -- /F
+ Invisible = 0x00000001, -- 2^0
+ Hidden = 0x00000002, -- 2^1
+ Printable = 0x00000004, -- 2^2
+ Print = 0x00000004, -- 2^2
+ NoZoom = 0x00000008, -- 2^3
+ NoRotate = 0x00000010, -- 2^4
+ NoView = 0x00000020, -- 2^5
+ ReadOnly = 0x00000040, -- 2^6
+ Locked = 0x00000080, -- 2^7
+ ToggleNoView = 0x00000100, -- 2^8
+ LockedContents = 0x00000200, -- 2^9
+ AutoView = 0x00000100, -- 2^8
+}
+
+-- todo: check what is interfaced
+
+flag.readonly = flag.ReadOnly
+flag.required = flag.Required
+flag.protected = flag.Password
+flag.sorted = flag.Sort
+flag.unavailable = flag.NoExport
+flag.nocheck = flag.DoNotSpellCheck
+flag.fixed = flag.DoNotScroll
+flag.file = flag.FileSelect
+
+plus.hidden = plus.Hidden
+plus.printable = plus.Printable
+plus.auto = plus.AutoView
+
+lpdf.flags.widgets = flag
+lpdf.flags.annotations = plus
+
+-- some day .. lpeg with function or table
+
+local function fieldflag(specification) -- /Ff
+ local o, n = specification.option, 0
+ if o and o ~= "" then
+ for f in gmatch(o,"[^, ]+") do
+ n = n + (flag[f] or 0)
+ end
+ end
+ return n
+end
+
+local function fieldplus(specification) -- /F
+ local o, n = specification.option, 0
+ if o and o ~= "" then
+ for p in gmatch(o,"[^, ]+") do
+ n = n + (plus[p] or 0)
+ end
+ end
+-- n = n + 4
+ return n
+end
+
+-- keep:
+--
+-- local function checked(what)
+-- local set, bug = references.identify("",what)
+-- if not bug and #set > 0 then
+-- local r, n = pdfaction(set)
+-- return pdfshareobjectreference(r)
+-- end
+-- end
+--
+-- local function fieldactions(specification) -- share actions
+-- local d, a = { }, nil
+-- a = specification.mousedown
+-- or specification.clickin if a and a ~= "" then d.D = checked(a) end
+-- a = specification.mouseup
+-- or specification.clickout if a and a ~= "" then d.U = 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.afterkey if a and a ~= "" then d.K = checked(a) end
+-- a = specification.format if a and a ~= "" then d.F = checked(a) end
+-- a = specification.validate if a and a ~= "" then d.V = checked(a) end
+-- a = specification.calculate if a and a ~= "" then d.C = checked(a) end
+-- a = specification.focusin if a and a ~= "" then d.Fo = checked(a) end
+-- a = specification.focusout if a and a ~= "" then d.Bl = checked(a) end
+-- a = specification.openpage if a and a ~= "" then d.PO = checked(a) end
+-- a = specification.closepage if a and a ~= "" then d.PC = checked(a) end
+-- -- a = specification.visiblepage if a and a ~= "" then d.PV = checked(a) end
+-- -- a = specification.invisiblepage if a and a ~= "" then d.PI = checked(a) end
+-- return next(d) and pdfdictionary(d)
+-- end
+
+local mapping = {
+ mousedown = "D", clickin = "D",
+ mouseup = "U", clickout = "U",
+ regionin = "E",
+ regionout = "X",
+ afterkey = "K",
+ format = "F",
+ validate = "V",
+ calculate = "C",
+ focusin = "Fo",
+ focusout = "Bl",
+ openpage = "PO",
+ closepage = "PC",
+ -- visiblepage = "PV",
+ -- invisiblepage = "PI",
+}
+
+local function fieldactions(specification) -- share actions
+ local d = nil
+ for key, target in sortedhash(mapping) do -- sort so that we can compare pdf
+ local code = specification[key]
+ if code and code ~= "" then
+ -- local a = checked(code)
+ local set, bug = references.identify("",code)
+ if not bug and #set > 0 then
+ local a = pdfaction(set) -- r, n
+ if a then
+ local r = pdfshareobjectreference(a)
+ if d then
+ d[target] = r
+ else
+ d = pdfdictionary { [target] = r }
+ end
+ else
+ report_fields("invalid field action %a, case %s",code,2)
+ end
+ else
+ report_fields("invalid field action %a, case %s",code,1)
+ end
+ end
+ end
+ -- if d then
+ -- d = pdfshareobjectreference(d) -- not much overlap or maybe only some patterns
+ -- end
+ return d
+end
+
+-- fonts and color
+
+local pdfdocencodingvector, pdfdocencodingcapsule
+
+-- The pdf doc encoding vector is needed in order to trigger propper unicode. Interesting is that when
+-- a glyph is not in the vector, it is still visible as it is taken from some other font. Messy.
+
+-- To be checked: only when text/line fields.
+
+local function checkpdfdocencoding()
+ report_fields("adding pdfdoc encoding vector")
+ local encoding = dofile(resolvers.findfile("lpdf-enc.lmt")) -- no checking, fatal if not present
+ pdfdocencodingvector = pdfreference(pdfflushobject(encoding))
+ local capsule = pdfdictionary {
+ PDFDocEncoding = pdfdocencodingvector
+ }
+ pdfdocencodingcapsule = pdfreference(pdfflushobject(capsule))
+ checkpdfdocencoding = function() end
+end
+
+local fontnames = {
+ rm = {
+ tf = "Times-Roman",
+ bf = "Times-Bold",
+ it = "Times-Italic",
+ sl = "Times-Italic",
+ bi = "Times-BoldItalic",
+ bs = "Times-BoldItalic",
+ },
+ ss = {
+ tf = "Helvetica",
+ bf = "Helvetica-Bold",
+ it = "Helvetica-Oblique",
+ sl = "Helvetica-Oblique",
+ bi = "Helvetica-BoldOblique",
+ bs = "Helvetica-BoldOblique",
+ },
+ tt = {
+ tf = "Courier",
+ bf = "Courier-Bold",
+ it = "Courier-Oblique",
+ sl = "Courier-Oblique",
+ bi = "Courier-BoldOblique",
+ bs = "Courier-BoldOblique",
+ },
+ symbol = {
+ dingbats = "ZapfDingbats",
+ }
+}
+
+local usedfonts = { }
+
+local function fieldsurrounding(specification)
+ local fontsize = specification.fontsize or "12pt"
+ local fontstyle = specification.fontstyle or "rm"
+ local fontalternative = specification.fontalternative or "tf"
+ local colorvalue = tonumber(specification.colorvalue)
+ local s = fontnames[fontstyle]
+ if not s then
+ fontstyle, s = "rm", fontnames.rm
+ end
+ local a = s[fontalternative]
+ if not a then
+ alternative, a = "tf", s.tf
+ end
+ local tag = fontstyle .. fontalternative
+ fontsize = todimen(fontsize)
+ fontsize = fontsize and (bpfactor * fontsize) or 12
+ fontraise = 0.1 * fontsize -- todo: figure out what the natural one is and compensate for strutdp
+ local fontcode = formatters["%0.4F Tf %0.4F Ts"](fontsize,fontraise)
+ -- we could test for colorvalue being 1 (black) and omit it then
+ local colorcode = pdfcolor(3,colorvalue) -- we force an rgb color space
+ if trace_fields then
+ report_fields("using font, style %a, alternative %a, size %p, tag %a, code %a",fontstyle,fontalternative,fontsize,tag,fontcode)
+ report_fields("using color, value %a, code %a",colorvalue,colorcode)
+ end
+ local stream = pdfstream {
+ pdfconstant(tag),
+ formatters["%s %s"](fontcode,colorcode)
+ }
+ usedfonts[tag] = a -- the name
+ -- move up with "x.y Ts"
+ return tostring(stream)
+end
+
+-- Can we use any font?
+
+codeinjections.fieldsurrounding = fieldsurrounding
+
+local function registerfonts()
+ if next(usedfonts) then
+ checkpdfdocencoding() -- already done
+ local pdffontlist = pdfdictionary()
+ local pdffonttype = pdfconstant("Font")
+ local pdffontsubtype = pdfconstant("Type1")
+ for tag, name in sortedhash(usedfonts) do
+ local f = pdfdictionary {
+ Type = pdffonttype,
+ Subtype = pdffontsubtype,
+ Name = pdfconstant(tag),
+ BaseFont = pdfconstant(name),
+ Encoding = pdfdocencodingvector,
+ }
+ pdffontlist[tag] = pdfreference(pdfflushobject(f))
+ end
+ return pdffontlist
+ end
+end
+
+-- symbols
+
+local function fieldappearances(specification)
+ -- todo: caching
+ local values = specification.values
+ local default = specification.default -- todo
+ if not values then
+ -- error
+ return
+ end
+ local v = settings_to_array(values)
+ local n, r, d
+ if #v == 1 then
+ n, r, d = v[1], v[1], v[1]
+ elseif #v == 2 then
+ n, r, d = v[1], v[1], v[2]
+ else
+ n, r, d = v[1], v[2], v[3]
+ end
+ local appearance = pdfdictionary {
+ N = registeredsymbol(n),
+ R = registeredsymbol(r),
+ D = registeredsymbol(d),
+ }
+ return pdfshareobjectreference(appearance)
+-- return pdfreference(pdfflushobject(appearance))
+end
+
+-- The rendering part of form support has always been crappy and didn't really
+-- improve over time. Did bugs become features? Who knows. Why provide for instance
+-- control over appearance and then ignore it when the mouse clicks someplace else.
+-- Strangely enough a lot of effort went into JavaScript support while basic
+-- appearance control of checkboxes stayed poor. I found this link when googling for
+-- conformation after the n^th time looking into this behaviour:
+--
+-- https://stackoverflow.com/questions/15479855/pdf-appearance-streams-checkbox-not-shown-correctly-after-focus-lost
+--
+-- ... "In particular check boxes, therefore, whenever not interacting with the user, shall
+-- be displayed using their normal captions, not their appearances."
+--
+-- So: don't use check boxes. In fact, even radio buttons can have these funny "flash some
+-- funny symbol" side effect when clocking on them. I tried all combinations if /H and /AP
+-- and /AS and ... Because (afaiks) the acrobat interface assumes that one uses dingbats no
+-- one really cared about getting custom appeances done well. This erratic behaviour might
+-- as well be the reason why no open source viewer ever bothered implementing forms. It's
+-- probably also why most forms out there look kind of bad.
+
+local function fieldstates_precheck(specification)
+ local values = specification.values
+ local default = specification.default
+ if not values or values == "" then
+ return
+ end
+ local yes = settings_to_array(values)[1]
+ local yesshown, yesvalue = lpegmatch(splitter,yes)
+ if not (yesshown and yesvalue) then
+ yesshown = yes
+ end
+ return default == settings_to_array(yesshown)[1] and pdf_yes or pdf_off
+end
+
+local function fieldstates_check(specification)
+ -- we don't use Opt here (too messy for radio buttons)
+ local values = specification.values
+ local default = specification.default
+ if not values or values == "" then
+ -- error
+ return
+ end
+ local v = settings_to_array(values)
+ local yes, off, yesn, yesr, yesd, offn, offr, offd
+ if #v == 1 then
+ yes, off = v[1], v[1]
+ else
+ yes, off = v[1], v[2]
+ end
+ local yesshown, yesvalue = lpegmatch(splitter,yes)
+ if not (yesshown and yesvalue) then
+ yesshown = yes, yes
+ end
+ yes = settings_to_array(yesshown)
+ local offshown, offvalue = lpegmatch(splitter,off)
+ if not (offshown and offvalue) then
+ offshown = off, off
+ end
+ off = settings_to_array(offshown)
+ if #yes == 1 then
+ yesn, yesr, yesd = yes[1], yes[1], yes[1]
+ elseif #yes == 2 then
+ yesn, yesr, yesd = yes[1], yes[1], yes[2]
+ else
+ yesn, yesr, yesd = yes[1], yes[2], yes[3]
+ end
+ if #off == 1 then
+ offn, offr, offd = off[1], off[1], off[1]
+ elseif #off == 2 then
+ offn, offr, offd = off[1], off[1], off[2]
+ else
+ offn, offr, offd = off[1], off[2], off[3]
+ end
+ if not yesvalue then
+ yesvalue = yesdefault or yesn
+ end
+ if not offvalue then
+ offvalue = offn
+ end
+ if default == yesn then
+ default = pdf_yes
+ yesvalue = yesvalue == yesn and "Yes" or "Off"
+ else
+ default = pdf_off
+ yesvalue = "Off"
+ end
+ local appearance
+ -- if false then
+ if true then
+ -- needs testing
+ appearance = pdfdictionary { -- maybe also cache components
+ N = pdfshareobjectreference(pdfdictionary { Yes = registeredsymbol(yesn), Off = registeredsymbol(offn) }),
+ R = pdfshareobjectreference(pdfdictionary { Yes = registeredsymbol(yesr), Off = registeredsymbol(offr) }),
+ D = pdfshareobjectreference(pdfdictionary { Yes = registeredsymbol(yesd), Off = registeredsymbol(offd) }),
+ }
+ else
+ appearance = pdfdictionary { -- maybe also cache components
+ N = pdfdictionary { Yes = registeredsymbol(yesn), Off = registeredsymbol(offn) },
+ R = pdfdictionary { Yes = registeredsymbol(yesr), Off = registeredsymbol(offr) },
+ D = pdfdictionary { Yes = registeredsymbol(yesd), Off = registeredsymbol(offd) }
+ }
+ end
+ local appearanceref = pdfshareobjectreference(appearance)
+ -- local appearanceref = pdfreference(pdfflushobject(appearance))
+ return appearanceref, default, yesvalue
+end
+
+-- It looks like there is always a (MK related) symbol used and that the appearances
+-- are only used as ornaments behind a symbol. So, contrary to what we did when
+-- widgets showed up, we now limit ourself to more dumb definitions. Especially when
+-- highlighting is enabled weird interferences happen. So, we play safe (some nice
+-- code has been removed that worked well till recently).
+
+local function fieldstates_radio(specification,name,parent)
+ local values = values or specification.values
+ local default = default or parent.default -- specification.default
+ if not values or values == "" then
+ -- error
+ return
+ end
+ local v = settings_to_array(values)
+ local yes, off, yesn, yesr, yesd, offn, offr, offd
+ if #v == 1 then
+ yes, off = v[1], v[1]
+ else
+ yes, off = v[1], v[2]
+ end
+ -- yes keys might be the same in the three appearances within a field
+ -- but can best be different among fields ... don't ask why
+ local yessymbols, yesvalue = lpegmatch(splitter,yes) -- n,r,d=>x
+ if not (yessymbols and yesvalue) then
+ yessymbols = yes
+ end
+ if not yesvalue then
+ yesvalue = name
+ end
+ yessymbols = settings_to_array(yessymbols)
+ if #yessymbols == 1 then
+ yesn = yessymbols[1]
+ yesr = yesn
+ yesd = yesr
+ elseif #yessymbols == 2 then
+ yesn = yessymbols[1]
+ yesr = yessymbols[2]
+ yesd = yesr
+ else
+ yesn = yessymbols[1]
+ yesr = yessymbols[2]
+ yesd = yessymbols[3]
+ end
+ -- we don't care about names, as all will be /Off
+ local offsymbols = lpegmatch(splitter,off) or off
+ offsymbols = settings_to_array(offsymbols)
+ if #offsymbols == 1 then
+ offn = offsymbols[1]
+ offr = offn
+ offd = offr
+ elseif #offsymbols == 2 then
+ offn = offsymbols[1]
+ offr = offsymbols[2]
+ offd = offr
+ else
+ offn = offsymbols[1]
+ offr = offsymbols[2]
+ offd = offsymbols[3]
+ end
+ if default == name then
+ default = pdfconstant(name)
+ else
+ default = pdf_off
+ end
+ --
+ local appearance
+ if false then -- needs testing
+ appearance = pdfdictionary { -- maybe also cache components
+ N = pdfshareobjectreference(pdfdictionary { [name] = registeredsymbol(yesn), Off = registeredsymbol(offn) }),
+ R = pdfshareobjectreference(pdfdictionary { [name] = registeredsymbol(yesr), Off = registeredsymbol(offr) }),
+ D = pdfshareobjectreference(pdfdictionary { [name] = registeredsymbol(yesd), Off = registeredsymbol(offd) }),
+ }
+ else
+ appearance = pdfdictionary { -- maybe also cache components
+ N = pdfdictionary { [name] = registeredsymbol(yesn), Off = registeredsymbol(offn) },
+ R = pdfdictionary { [name] = registeredsymbol(yesr), Off = registeredsymbol(offr) },
+ D = pdfdictionary { [name] = registeredsymbol(yesd), Off = registeredsymbol(offd) }
+ }
+ end
+ local appearanceref = pdfshareobjectreference(appearance) -- pdfreference(pdfflushobject(appearance))
+ return appearanceref, default, yesvalue
+end
+
+local function fielddefault(field,pdf_yes)
+ local default = field.default
+ if not default or default == "" then
+ local values = settings_to_array(field.values)
+ default = values[1]
+ end
+ if not default or default == "" then
+ return pdf_off
+ else
+ return pdf_yes or pdfconstant(default)
+ end
+end
+
+local function fieldoptions(specification)
+ local values = specification.values
+ local default = specification.default
+ if values then
+ local v = settings_to_array(values)
+ for i=1,#v do
+ local vi = v[i]
+ local shown, value = lpegmatch(splitter,vi)
+ if shown and value then
+ v[i] = pdfarray { pdfunicode(value), shown }
+ else
+ v[i] = pdfunicode(v[i])
+ end
+ end
+ return pdfarray(v)
+ end
+end
+
+local mapping = {
+ -- acrobat compliant (messy, probably some pdfdoc encoding interference here)
+ check = "4", -- 0x34
+ circle = "l", -- 0x6C
+ cross = "8", -- 0x38
+ diamond = "u", -- 0x75
+ square = "n", -- 0x6E
+ star = "H", -- 0x48
+}
+
+local function todingbat(n)
+ if n and n ~= "" then
+ return mapping[n] or ""
+ end
+end
+
+local function fieldrendering(specification)
+ local bvalue = tonumber(specification.backgroundcolorvalue)
+ local fvalue = tonumber(specification.framecolorvalue)
+ local svalue = specification.fontsymbol
+ if bvalue or fvalue or (svalue and svalue ~= "") then
+ return pdfdictionary {
+ BG = bvalue and pdfarray { pdfcolorvalues(3,bvalue) } or nil, -- or zero_bg,
+ BC = fvalue and pdfarray { pdfcolorvalues(3,fvalue) } or nil, -- or zero_bc,
+ CA = svalue and pdfstring (svalue) or nil,
+ }
+ end
+end
+
+-- layers
+
+local function fieldlayer(specification) -- we can move this in line
+ local layer = specification.layer
+ return (layer and pdflayerreference(layer)) or nil
+end
+
+-- defining
+
+local fields, radios, clones, fieldsets, calculationset = { }, { }, { }, { }, nil
+
+local xfdftemplate = [[
+<?xml version='1.0' encoding='UTF-8'?>
+
+<xfdf xmlns='http://ns.adobe.com/xfdf/'>
+ <f href='%s.pdf'/>
+ <fields>
+%s
+ </fields>
+</xfdf>
+]]
+
+function codeinjections.exportformdata(name)
+ local result = { }
+ for k, v in sortedhash(fields) do
+ result[#result+1] = formatters[" <field name='%s'><value>%s</value></field>"](v.name or k,v.default or "")
+ end
+ local base = file.basename(tex.jobname)
+ local xfdf = format(xfdftemplate,base,table.concat(result,"\n"))
+ if not name or name == "" then
+ name = base
+ end
+ io.savedata(file.addsuffix(name,"xfdf"),xfdf)
+end
+
+function codeinjections.definefieldset(tag,list)
+ fieldsets[tag] = list
+end
+
+function codeinjections.getfieldset(tag)
+ return fieldsets[tag]
+end
+
+local function fieldsetlist(tag)
+ if tag then
+ local ft = fieldsets[tag]
+ if ft then
+ local a = pdfarray()
+ for name in gmatch(list,"[^, ]+") do
+ local f = field[name]
+ if f and f.pobj then
+ a[#a+1] = pdfreference(f.pobj)
+ end
+ end
+ return a
+ end
+ end
+end
+
+function codeinjections.setfieldcalculationset(tag)
+ calculationset = tag
+end
+
+interfaces.implement {
+ name = "setfieldcalculationset",
+ actions = codeinjections.setfieldcalculationset,
+ arguments = "string",
+}
+
+local function predefinesymbols(specification)
+ local values = specification.values
+ if values then
+ local symbols = settings_to_array(values)
+ for i=1,#symbols do
+ local symbol = symbols[i]
+ local a, b = lpegmatch(splitter,symbol)
+ codeinjections.presetsymbol(a or symbol)
+ end
+ end
+end
+
+function codeinjections.getdefaultfieldvalue(name)
+ local f = fields[name]
+ if f then
+ local values = f.values
+ local default = f.default
+ if not default or default == "" then
+ local symbols = settings_to_array(values)
+ local symbol = symbols[1]
+ if symbol then
+ local a, b = lpegmatch(splitter,symbol) -- splits at =>
+ default = a or symbol
+ end
+ end
+ return default
+ end
+end
+
+function codeinjections.definefield(specification)
+ local n = specification.name
+ local f = fields[n]
+ if not f then
+ local fieldtype = specification.type
+ if not fieldtype then
+ if trace_fields then
+ report_fields("invalid definition for %a, unknown type",n)
+ end
+ elseif fieldtype == "radio" then
+ local values = specification.values
+ if values and values ~= "" then
+ values = settings_to_array(values)
+ for v=1,#values do
+ radios[values[v]] = { parent = n }
+ end
+ fields[n] = specification
+ if trace_fields then
+ report_fields("defining %a as type %a",n,"radio")
+ end
+ elseif trace_fields then
+ report_fields("invalid definition of radio %a, missing values",n)
+ end
+ elseif fieldtype == "sub" then
+ -- not in main field list !
+ local radio = radios[n]
+ if radio then
+ -- merge specification
+ for key, value in next, specification do
+ radio[key] = value
+ end
+ if trace_fields then
+ local p = radios[n] and radios[n].parent
+ report_fields("defining %a as type sub of radio %a",n,p)
+ end
+ elseif trace_fields then
+ report_fields("invalid definition of radio sub %a, no parent given",n)
+ end
+ predefinesymbols(specification)
+ elseif fieldtype == "text" or fieldtype == "line" then
+ fields[n] = specification
+ if trace_fields then
+ report_fields("defining %a as type %a",n,fieldtype)
+ end
+ if specification.values ~= "" and specification.default == "" then
+ specification.default, specification.values = specification.values, nil
+ end
+ else
+ fields[n] = specification
+ if trace_fields then
+ report_fields("defining %a as type %a",n,fieldtype)
+ end
+ predefinesymbols(specification)
+ end
+ elseif trace_fields then
+ report_fields("invalid definition for %a, already defined",n)
+ end
+end
+
+function codeinjections.clonefield(specification) -- obsolete
+ local p = specification.parent
+ local c = specification.children
+ local v = specification.alternative
+ if not p or not c then
+ if trace_fields then
+ report_fields("invalid clone, children %a, parent %a, alternative %a",c,p,v)
+ end
+ return
+ end
+ local x = fields[p] or radios[p]
+ if not x then
+ if trace_fields then
+ report_fields("invalid clone, unknown parent %a",p)
+ end
+ return
+ end
+ for n in gmatch(c,"[^, ]+") do
+ local f, r, c = fields[n], radios[n], clones[n]
+ if f or r or c then
+ if trace_fields then
+ report_fields("already cloned, child %a, parent %a, alternative %a",n,p,v)
+ end
+ else
+ if trace_fields then
+ report_fields("cloning, child %a, parent %a, alternative %a",n,p,v)
+ end
+ clones[n] = specification
+ predefinesymbols(specification)
+ end
+ end
+end
+
+function codeinjections.getfieldcategory(name)
+ local f = fields[name] or radios[name] or clones[name]
+ if f then
+ local g = f.category
+ if not g or g == "" then
+ local v, p, t = f.alternative, f.parent, f.type
+ if v == "clone" or v == "copy" then
+ f = fields[p] or radios[p]
+ g = f and f.category
+ elseif t == "sub" then
+ f = fields[p]
+ g = f and f.category
+ end
+ end
+ return g
+ end
+end
+
+--
+
+function codeinjections.validfieldcategory(name)
+ return fields[name] or radios[name] or clones[name]
+end
+
+function codeinjections.validfieldset(name)
+ return fieldsets[tag]
+end
+
+function codeinjections.validfield(name)
+ return fields[name]
+end
+
+--
+
+local alignments = {
+ flushleft = 0, right = 0,
+ center = 1, middle = 1,
+ flushright = 2, left = 2,
+}
+
+local function fieldalignment(specification)
+ return alignments[specification.align] or 0
+end
+
+local function enhance(specification,option)
+ local so = specification.option
+ if so and so ~= "" then
+ specification.option = so .. "," .. option
+ else
+ specification.option = option
+ end
+ return specification
+end
+
+-- finish (if we also collect parents we can inline the kids which is
+-- more efficient ... but hardly anyone used widgets so ...)
+
+local collected = pdfarray()
+local forceencoding = false
+
+-- todo : check #opt
+
+local function finishfields()
+ local sometext = forceencoding
+ local somefont = next(usedfonts)
+ for name, field in sortedhash(fields) do
+ local kids = field.kids
+ if kids then
+ pdfflushobject(field.kidsnum,kids)
+ end
+ local opt = field.opt
+ if opt then
+ pdfflushobject(field.optnum,opt)
+ end
+ local type = field.type
+ if not sometext and (type == "text" or type == "line") then
+ sometext = true
+ end
+ end
+ for name, field in sortedhash(radios) do
+ local kids = field.kids
+ if kids then
+ pdfflushobject(field.kidsnum,kids)
+ end
+ local opt = field.opt
+ if opt then
+ pdfflushobject(field.optnum,opt)
+ end
+ end
+ if #collected > 0 then
+ local acroform = pdfdictionary {
+ NeedAppearances = pdfmajorversion() == 1 or nil,
+ Fields = pdfreference(pdfflushobject(collected)),
+ CO = fieldsetlist(calculationset),
+ }
+ if sometext or somefont then
+ checkpdfdocencoding()
+ if sometext then
+ usedfonts.tttf = fontnames.tt.tf
+ acroform.DA = "/tttf 12 Tf 0 g"
+ end
+ acroform.DR = pdfdictionary {
+ Font = registerfonts(),
+ Encoding = pdfdocencodingcapsule,
+ }
+ end
+ -- maybe:
+ -- if sometext then
+ -- checkpdfdocencoding()
+ -- if sometext then
+ -- usedfonts.tttf = fontnames.tt.tf
+ -- acroform.DA = "/tttf 12 Tf 0 g"
+ -- end
+ -- acroform.DR = pdfdictionary {
+ -- Font = registerfonts(),
+ -- Encoding = pdfdocencodingcapsule,
+ -- }
+ -- elseif somefont then
+ -- acroform.DR = pdfdictionary {
+ -- Font = registerfonts(),
+ -- }
+ -- end
+ lpdf.addtocatalog("AcroForm",pdfreference(pdfflushobject(acroform)))
+ end
+end
+
+lpdf.registerdocumentfinalizer(finishfields,"form fields")
+
+local methods = { }
+
+function nodeinjections.typesetfield(name,specification)
+ local field = fields[name] or radios[name] or clones[name]
+ if not field then
+ report_fields( "unknown child %a",name)
+ -- unknown field
+ return
+ end
+ local alternative, parent = field.alternative, field.parent
+ if alternative == "copy" or alternative == "clone" then -- only in clones
+ field = fields[parent] or radios[parent]
+ end
+ local method = methods[field.type]
+ if method then
+ return method(name,specification,alternative)
+ else
+ report_fields( "unknown method %a for child %a",field.type,name)
+ end
+end
+
+local function save_parent(field,specification,d)
+ local kidsnum = pdfreserveobject()
+ d.Kids = pdfreference(kidsnum)
+ field.kidsnum = kidsnum
+ field.kids = pdfarray()
+-- if d.Opt then
+-- local optnum = pdfreserveobject()
+-- d.Opt = pdfreference(optnum)
+-- field.optnum = optnum
+-- field.opt = pdfarray()
+-- end
+ local pnum = pdfflushobject(d)
+ field.pobj = pnum
+ collected[#collected+1] = pdfreference(pnum)
+end
+
+local function save_kid(field,specification,d,optname)
+ local kn = pdfreserveobject()
+ field.kids[#field.kids+1] = pdfreference(kn)
+-- if optname then
+-- local opt = field.opt
+-- if opt then
+-- opt[#opt+1] = optname
+-- end
+-- end
+ local width = specification.width or 0
+ local height = specification.height or 0
+ local depth = specification.depth or 0
+ local box = hpack_node(nodeinjections.annotation(width,height,depth,d(),kn))
+ -- redundant
+ box.width = width
+ box.height = height
+ box.depth = depth
+ return box
+end
+
+local function makelineparent(field,specification)
+ local text = pdfunicode(field.default)
+ local length = tonumber(specification.length or 0) or 0
+ local d = pdfdictionary {
+ Subtype = pdf_widget,
+ T = pdfunicode(specification.title),
+ F = fieldplus(specification),
+ Ff = fieldflag(specification),
+ OC = fieldlayer(specification),
+ DA = fieldsurrounding(specification),
+ AA = fieldactions(specification),
+ FT = pdf_tx,
+ Q = fieldalignment(specification),
+ MaxLen = length == 0 and 1000 or length,
+ DV = text,
+ V = text,
+ }
+ save_parent(field,specification,d)
+end
+
+local function makelinechild(name,specification)
+ local field = clones[name]
+ local parent = nil
+ if field then
+ parent = fields[field.parent]
+ if not parent.pobj then
+ if trace_fields then
+ report_fields("forcing parent text %a",parent.name)
+ end
+ makelineparent(parent,specification)
+ end
+ else
+ parent = fields[name]
+ field = parent
+ if not parent.pobj then
+ if trace_fields then
+ report_fields("using parent text %a",name)
+ end
+ makelineparent(parent,specification)
+ end
+ end
+ if trace_fields then
+ report_fields("using child text %a",name)
+ end
+ -- we could save a little by not setting some key/value when it's the
+ -- same as parent but it would cost more memory to keep track of it
+ local d = pdfdictionary {
+ Subtype = pdf_widget,
+ Parent = pdfreference(parent.pobj),
+ F = fieldplus(specification),
+ OC = fieldlayer(specification),
+ DA = fieldsurrounding(specification),
+ AA = fieldactions(specification),
+ MK = fieldrendering(specification),
+ Q = fieldalignment(specification),
+ }
+ return save_kid(parent,specification,d)
+end
+
+function methods.line(name,specification)
+ return makelinechild(name,specification)
+end
+
+function methods.text(name,specification)
+ return makelinechild(name,enhance(specification,"MultiLine"))
+end
+
+-- copy of line ... probably also needs a /Lock
+
+local function makesignatureparent(field,specification)
+ local text = pdfunicode(field.default)
+ local length = tonumber(specification.length or 0) or 0
+ local d = pdfdictionary {
+ Subtype = pdf_widget,
+ T = pdfunicode(specification.title),
+ F = fieldplus(specification),
+ Ff = fieldflag(specification),
+ OC = fieldlayer(specification),
+ DA = fieldsurrounding(specification),
+ AA = fieldactions(specification),
+ FT = pdf_sig,
+ Q = fieldalignment(specification),
+ MaxLen = length == 0 and 1000 or length,
+ DV = text,
+ V = text,
+ }
+ save_parent(field,specification,d)
+end
+
+local function makesignaturechild(name,specification)
+ local field = clones[name]
+ local parent = nil
+ if field then
+ parent = fields[field.parent]
+ if not parent.pobj then
+ if trace_fields then
+ report_fields("forcing parent signature %a",parent.name)
+ end
+ makesignatureparent(parent,specification)
+ end
+ else
+ parent = fields[name]
+ field = parent
+ if not parent.pobj then
+ if trace_fields then
+ report_fields("using parent text %a",name)
+ end
+ makesignatureparent(parent,specification)
+ end
+ end
+ if trace_fields then
+ report_fields("using child text %a",name)
+ end
+ -- we could save a little by not setting some key/value when it's the
+ -- same as parent but it would cost more memory to keep track of it
+ local d = pdfdictionary {
+ Subtype = pdf_widget,
+ Parent = pdfreference(parent.pobj),
+ F = fieldplus(specification),
+ OC = fieldlayer(specification),
+ DA = fieldsurrounding(specification),
+ AA = fieldactions(specification),
+ MK = fieldrendering(specification),
+ Q = fieldalignment(specification),
+ }
+ return save_kid(parent,specification,d)
+end
+
+function methods.signature(name,specification)
+ return makesignaturechild(name,specification)
+end
+--
+
+local function makechoiceparent(field,specification)
+ local d = pdfdictionary {
+ Subtype = pdf_widget,
+ T = pdfunicode(specification.title),
+ F = fieldplus(specification),
+ Ff = fieldflag(specification),
+ OC = fieldlayer(specification),
+ AA = fieldactions(specification),
+ FT = pdf_ch,
+ Opt = fieldoptions(field), -- todo
+ }
+ save_parent(field,specification,d)
+end
+
+local function makechoicechild(name,specification)
+ local field = clones[name]
+ local parent = nil
+ if field then
+ parent = fields[field.parent]
+ if not parent.pobj then
+ if trace_fields then
+ report_fields("forcing parent choice %a",parent.name)
+ end
+ makechoiceparent(parent,specification,extras)
+ end
+ else
+ parent = fields[name]
+ field = parent
+ if not parent.pobj then
+ if trace_fields then
+ report_fields("using parent choice %a",name)
+ end
+ makechoiceparent(parent,specification,extras)
+ end
+ end
+ if trace_fields then
+ report_fields("using child choice %a",name)
+ end
+ local d = pdfdictionary {
+ Subtype = pdf_widget,
+ Parent = pdfreference(parent.pobj),
+ F = fieldplus(specification),
+ OC = fieldlayer(specification),
+ AA = fieldactions(specification),
+ }
+ return save_kid(parent,specification,d) -- do opt here
+end
+
+function methods.choice(name,specification)
+ return makechoicechild(name,specification)
+end
+
+function methods.popup(name,specification)
+ return makechoicechild(name,enhance(specification,"PopUp"))
+end
+
+function methods.combo(name,specification)
+ return makechoicechild(name,enhance(specification,"PopUp,Edit"))
+end
+
+local function makecheckparent(field,specification)
+ local default = fieldstates_precheck(field)
+ local d = pdfdictionary {
+ T = pdfunicode(specification.title), -- todo: when tracing use a string
+ F = fieldplus(specification),
+ Ff = fieldflag(specification),
+ OC = fieldlayer(specification),
+ AA = fieldactions(specification), -- can be shared
+ FT = pdf_btn,
+ V = fielddefault(field,default),
+ }
+ save_parent(field,specification,d)
+end
+
+local function makecheckchild(name,specification)
+ local field = clones[name]
+ local parent = nil
+ if field then
+ parent = fields[field.parent]
+ if not parent.pobj then
+ if trace_fields then
+ report_fields("forcing parent check %a",parent.name)
+ end
+ makecheckparent(parent,specification,extras)
+ end
+ else
+ parent = fields[name]
+ field = parent
+ if not parent.pobj then
+ if trace_fields then
+ report_fields("using parent check %a",name)
+ end
+ makecheckparent(parent,specification,extras)
+ end
+ end
+ if trace_fields then
+ report_fields("using child check %a",name)
+ end
+ local d = pdfdictionary {
+ Subtype = pdf_widget,
+ Parent = pdfreference(parent.pobj),
+ F = fieldplus(specification),
+ OC = fieldlayer(specification),
+ AA = fieldactions(specification), -- can be shared
+ H = pdf_n,
+ }
+ local fontsymbol = specification.fontsymbol
+ if fontsymbol and fontsymbol ~= "" then
+ specification.fontsymbol = todingbat(fontsymbol)
+ specification.fontstyle = "symbol"
+ specification.fontalternative = "dingbats"
+ d.DA = fieldsurrounding(specification)
+ d.MK = fieldrendering(specification)
+ return save_kid(parent,specification,d)
+ else
+ local appearance, default, value = fieldstates_check(field)
+ d.AS = default
+ d.AP = appearance
+ return save_kid(parent,specification,d)
+ end
+end
+
+function methods.check(name,specification)
+ return makecheckchild(name,specification)
+end
+
+local function makepushparent(field,specification) -- check if we can share with the previous
+ local d = pdfdictionary {
+ Subtype = pdf_widget,
+ T = pdfunicode(specification.title),
+ F = fieldplus(specification),
+ Ff = fieldflag(specification),
+ OC = fieldlayer(specification),
+ AA = fieldactions(specification), -- can be shared
+ FT = pdf_btn,
+ AP = fieldappearances(field),
+ H = pdf_p,
+ }
+ save_parent(field,specification,d)
+end
+
+local function makepushchild(name,specification)
+ local field, parent = clones[name], nil
+ if field then
+ parent = fields[field.parent]
+ if not parent.pobj then
+ if trace_fields then
+ report_fields("forcing parent push %a",parent.name)
+ end
+ makepushparent(parent,specification)
+ end
+ else
+ parent = fields[name]
+ field = parent
+ if not parent.pobj then
+ if trace_fields then
+ report_fields("using parent push %a",name)
+ end
+ makepushparent(parent,specification)
+ end
+ end
+ if trace_fields then
+ report_fields("using child push %a",name)
+ end
+ local fontsymbol = specification.fontsymbol
+ local d = pdfdictionary {
+ Subtype = pdf_widget,
+ Parent = pdfreference(field.pobj),
+ F = fieldplus(specification),
+ OC = fieldlayer(specification),
+ AA = fieldactions(specification), -- can be shared
+ H = pdf_p,
+ }
+ if fontsymbol and fontsymbol ~= "" then
+ specification.fontsymbol = todingbat(fontsymbol)
+ specification.fontstyle = "symbol"
+ specification.fontalternative = "dingbats"
+ d.DA = fieldsurrounding(specification)
+ d.MK = fieldrendering(specification)
+ else
+ d.AP = fieldappearances(field)
+ end
+ return save_kid(parent,specification,d)
+end
+
+function methods.push(name,specification)
+ return makepushchild(name,enhance(specification,"PushButton"))
+end
+
+local function makeradioparent(field,specification)
+ specification = enhance(specification,"Radio,RadiosInUnison,Print,NoToggleToOff")
+ local d = pdfdictionary {
+ T = field.name,
+ FT = pdf_btn,
+ -- F = fieldplus(specification),
+ Ff = fieldflag(specification),
+ -- H = pdf_n,
+ V = fielddefault(field),
+ }
+ save_parent(field,specification,d)
+end
+
+-- local function makeradiochild(name,specification)
+-- local field = clones[name]
+-- local parent = nil
+-- local pname = nil
+-- if field then
+-- pname = field.parent
+-- field = radios[pname]
+-- parent = fields[pname]
+-- if not parent.pobj then
+-- if trace_fields then
+-- report_fields("forcing parent radio %a",parent.name)
+-- end
+-- makeradioparent(parent,parent)
+-- end
+-- else
+-- field = radios[name]
+-- if not field then
+-- report_fields("there is some problem with field %a",name)
+-- return nil
+-- end
+-- pname = field.parent
+-- parent = fields[pname]
+-- if not parent.pobj then
+-- if trace_fields then
+-- report_fields("using parent radio %a",name)
+-- end
+-- makeradioparent(parent,parent)
+-- end
+-- end
+-- if trace_fields then
+-- report_fields("using child radio %a with values %a and default %a",name,field.values,field.default)
+-- end
+-- local fontsymbol = specification.fontsymbol
+-- -- fontsymbol = "circle"
+-- local d = pdfdictionary {
+-- Subtype = pdf_widget,
+-- Parent = pdfreference(parent.pobj),
+-- F = fieldplus(specification),
+-- OC = fieldlayer(specification),
+-- AA = fieldactions(specification),
+-- H = pdf_n,
+-- -- H = pdf_p,
+-- -- P = pdfpagereference(true),
+-- }
+-- if fontsymbol and fontsymbol ~= "" then
+-- specification.fontsymbol = todingbat(fontsymbol)
+-- specification.fontstyle = "symbol"
+-- specification.fontalternative = "dingbats"
+-- d.DA = fieldsurrounding(specification)
+-- d.MK = fieldrendering(specification)
+-- return save_kid(parent,specification,d) -- todo: what if no value
+-- else
+-- local appearance, default, value = fieldstates_radio(field,name,fields[pname])
+-- d.AP = appearance
+-- d.AS = default -- /Whatever
+-- return save_kid(parent,specification,d,value)
+-- end
+-- end
+
+local function makeradiochild(name,specification)
+ local field, parent = clones[name], nil
+ if field then
+ field = radios[field.parent]
+ parent = fields[field.parent]
+ if not parent.pobj then
+ if trace_fields then
+ report_fields("forcing parent radio %a",parent.name)
+ end
+ makeradioparent(parent,parent)
+ end
+ else
+ field = radios[name]
+ if not field then
+ report_fields("there is some problem with field %a",name)
+ return nil
+ end
+ parent = fields[field.parent]
+ if not parent.pobj then
+ if trace_fields then
+ report_fields("using parent radio %a",name)
+ end
+ makeradioparent(parent,parent)
+ end
+ end
+ if trace_fields then
+ report_fields("using child radio %a with values %a and default %a",name,field.values,field.default)
+ end
+ local fontsymbol = specification.fontsymbol
+ -- fontsymbol = "circle"
+ local d = pdfdictionary {
+ Subtype = pdf_widget,
+ Parent = pdfreference(parent.pobj),
+ F = fieldplus(specification),
+ OC = fieldlayer(specification),
+ AA = fieldactions(specification),
+ H = pdf_n,
+ }
+ if fontsymbol and fontsymbol ~= "" then
+ specification.fontsymbol = todingbat(fontsymbol)
+ specification.fontstyle = "symbol"
+ specification.fontalternative = "dingbats"
+ d.DA = fieldsurrounding(specification)
+ d.MK = fieldrendering(specification)
+ end
+ local appearance, default, value = fieldstates_radio(field,name,fields[field.parent])
+ d.AP = appearance
+ d.AS = default -- /Whatever
+-- d.MK = pdfdictionary { BC = pdfarray {0}, BG = pdfarray { 1 } }
+d.BS = pdfdictionary { S = pdfconstant("I"), W = 1 }
+ return save_kid(parent,specification,d,value)
+end
+
+function methods.sub(name,specification)
+ return makeradiochild(name,enhance(specification,"Radio,RadiosInUnison"))
+end