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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"
}
-- 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, next = tostring, 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 pdfflushobject = lpdf.flushobject
local pdfshareobjectreference = lpdf.shareobjectreference
local pdfshareobject = lpdf.shareobject
local pdfreserveobject = lpdf.reserveobject
local pdfaction = lpdf.action
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")
----- 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 = 2^ 0, -- 1
Required = 2^ 1, -- 2
NoExport = 2^ 2, -- 3
MultiLine = 2^12, -- 13
Password = 2^13, -- 14
NoToggleToOff = 2^14, -- 15
Radio = 2^15, -- 16
PushButton = 2^16, -- 17
PopUp = 2^17, -- 18
Edit = 2^18, -- 19
Sort = 2^19, -- 20
FileSelect = 2^20, -- 21
DoNotSpellCheck = 2^22, -- 23
DoNotScroll = 2^23, -- 24
Comb = 2^24, -- 25
RichText = 2^25, -- 26
RadiosInUnison = 2^25, -- 26
CommitOnSelChange = 2^26, -- 27
}
local plus = { -- /F
Invisible = 2^0, -- 1
Hidden = 2^1, -- 2
Printable = 2^2, -- 3
Print = 2^2, -- 3
NoZoom = 2^3, -- 4
NoRotate = 2^4, -- 5
NoView = 2^5, -- 6
ReadOnly = 2^6, -- 7
Locked = 2^7, -- 8
ToggleNoView = 2^8, -- 9
LockedContents = 2^9, -- 10,
AutoView = 2^8, -- 6 + 9 ?
}
-- 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
-- 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.lua")) -- 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
local function registerfonts()
if next(usedfonts) then
checkpdfdocencoding() -- already done
local d = pdfdictionary()
local pdffonttype, pdffontsubtype = pdfconstant("Font"), pdfconstant("Type1")
-- for tag, name in next, usedfonts do
for tag, name in sortedhash(usedfonts) do
local f = pdfdictionary {
Type = pdffonttype,
Subtype = pdffontsubtype,
Name = pdfconstant(tag),
BaseFont = pdfconstant(name),
Encoding = pdfdocencodingvector,
}
d[tag] = pdfreference(pdfflushobject(f))
end
return d
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
local YesorOn = "Yes" -- somehow On is not always working out well any longer (why o why this change)
-- beware ... maybe we should have unique /Yes1 ... we will probably
-- change this one too.
--
-- TODO: the same as radio .. play safe and use different names.
local function fieldstates_check(specification,forceyes,values,default,yesdefault)
-- we don't use Opt here (too messy for radio buttons)
local values, default = values or specification.values, default or 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 forceyes == true then
forceyes = YesorOn -- spec likes Yes more but we've used On for ages now
else
-- false or string
end
if default == yesn then
default = pdfconstant(forceyes or yesn)
else
default = pdf_off
end
local appearance
if false then -- needs testing
appearance = pdfdictionary { -- maybe also cache components
N = pdfshareobjectreference(pdfdictionary { [forceyes or yesn] = registeredsymbol(yesn), Off = registeredsymbol(offn) }),
R = pdfshareobjectreference(pdfdictionary { [forceyes or yesr] = registeredsymbol(yesr), Off = registeredsymbol(offr) }),
D = pdfshareobjectreference(pdfdictionary { [forceyes or yesd] = registeredsymbol(yesd), Off = registeredsymbol(offd) }),
}
else
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) }
}
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)
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 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, c, v = specification.parent, specification.children, 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
local collected = pdfarray()
local forceencoding = false
local function finishfields()
local sometext = forceencoding
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 = true,
Fields = pdfreference(pdfflushobject(collected)),
CO = fieldsetlist(calculationset),
}
if sometext then
checkpdfdocencoding()
usedfonts.tttf = fontnames.tt.tf
acroform.DA = "/tttf 12 Tf 0 g"
acroform.DR = pdfdictionary {
Font = registerfonts(),
Encoding = pdfdocencodingcapsule,
}
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,hasopt)
local kidsnum = pdfreserveobject()
d.Kids = pdfreference(kidsnum)
field.kidsnum = kidsnum
field.kids = pdfarray()
if hasopt 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, height, depth = specification.width or 0, specification.height or 0, specification.depth
local box = hpack_node(nodeinjections.annotation(width,height,depth,d(),kn))
box.width, box.height, box.depth = width, height, depth -- redundant
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, parent = clones[name], 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, parent = clones[name], 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, parent = clones[name], 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 d = pdfdictionary {
T = pdfunicode(specification.title), -- todo: when tracing use a string
F = fieldplus(specification),
Ff = fieldflag(specification),
OC = fieldlayer(specification),
AA = fieldactions(specification),
FT = pdf_btn,
V = fielddefault(field),
}
save_parent(field,specification,d,true)
end
local function makecheckchild(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 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),
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,true)
d.AS = default
d.AP = appearance
return save_kid(parent,specification,d,value)
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),
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),
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")
specification = enhance(specification,"Radio,RadiosInUnison,Print,NoToggleToOff")
-- specification = enhance(specification,"Radio,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,true)
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="star"
-- 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
-- local appearance, default, value = fieldstates_radio(field,true,false,false,name) -- false is also ok
-- specification.fontsymbol = todingbat(fontsymbol)
-- specification.fontstyle = "symbol"
-- specification.fontalternative = "dingbats"
-- d.DA = fieldsurrounding(specification)
-- d.MK = fieldrendering(specification)
-- d.AS = pdfconstant(value) -- default -- mandate when AP but confuses viewers
-- d.AP = appearance
-- return save_kid(parent,specification,d,value)
-- -- return save_kid(parent,specification,d,name)
-- else
-- -- local appearance, default, value = fieldstates_radio(field,true) -- false is also ok
-- local appearance, default, value = fieldstates_radio(field,true,false,false,name) -- false is also ok
-- d.AS = default -- mandate when AP but confuses viewers
-- d.AP = appearance
-- 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
return save_kid(parent,specification,d,value)
end
function methods.sub(name,specification)
return makeradiochild(name,enhance(specification,"Radio,RadiosInUnison"))
end
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