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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"
}
-- cleaned up, e.g. no longer older viewers
-- always kids so no longer explicit main / clone / copy
-- some optimizations removed (will come bakc if needed)
local gmatch, lower, format = string.gmatch, string.lower, string.format
local lpegmatch = lpeg.match
local trace_fields = false trackers.register("widgets.fields", function(v) trace_fields = v end)
local texsprint, ctxcatcodes = tex.sprint, tex.ctxcatcodes
local variables = interfaces.variables
local nodeinjections = backends.pdf.nodeinjections
local codeinjections = backends.pdf.codeinjections
local registrations = backends.pdf.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 pdftoeight = lpdf.toeight
local pdfflushobject = lpdf.flushobject
local pdfreserveobject = lpdf.reserveobject
local pdfannotation = nodes.pdfannotation
local submitoutputformat = 0 -- 0=unknown 1=HTML 2=FDF 3=XML => not yet used, needs to be checked
local splitter = lpeg.splitat("=>")
local formats = {
html = 1, fdf = 2, xml = 3,
}
function codeinjections.setformsmethod(name)
submitoutputformat = formats[lower(name)] or 3
end
local flag = {
MultiLine = 4096, -- 13
NoToggleToOff = 16384, -- 15
Radio = 32768, -- 16
PushButton = 65536, -- 17
PopUp = 131072, -- 18
Edit = 262144, -- 19
RadiosInUnison = 33554432, -- 26
DoNotSpellCheck = 4194304, -- 23
DoNotScroll = 8388608, -- 24
ReadOnly = 1, -- 1
Required = 2, -- 2
NoExport = 4, -- 3
Password = 8192, -- 14
Sort = 524288, -- 20
FileSelect = 1048576, -- 21
}
local plus = {
Invisible = 1, -- 1
Hidden = 2, -- 2
Printable = 4, -- 3
NoView = 32, -- 6
ToggleNoView = 256, -- 9
AutoView = 256, -- 288 (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)
local o, n = specification.options, 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)
local o, n = specification.options, 0
if o and o ~= "" then
for p in gmatch(o,"[^, ]+") do
n = n + (plus[p] or 0)
end
end
return n
end
local function checked(what)
if what and what ~= "" then
local set, bug = jobreferences.identify("",what)
return not bug and #set > 0 and lpdf.pdfaction(set)
end
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.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
a = specification.calculatewhatever 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
-- fonts and color
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",
}
}
local usedfonts = { }
local function fieldsurrounding(specification)
local size = specification.fontsize or "12pt"
local style = specification.fontstyle or "rm"
local alternative = specification.fontalternative or "tf"
local s = fontnames[style]
if not s then
style, s = "rm", fontnames.rm
end
local a = s[alternative]
if not a then
alternative, a = "tf", s.tf
end
local tag = style .. alternative
size = string.todimen(size)
local stream = pdfstream {
pdfconstant(tag),
format("%0.4f Tf",(size and (number.dimenfactors.bp * size)) or 12),
}
usedfonts[tag] = a -- the name
-- add color to stream: 0 g
-- move up with "x.y Ts"
return tostring(stream)
end
local function registerfonts()
if next(usedfonts) then
local d = pdfdictionary()
for tag, name in next, usedfonts do
local f = pdfdictionary {
Type = pdfconstant("Font"),
Subtype = pdfconstant("Type1"), -- todo
Name = pdfconstant(tag),
BaseFont = pdfconstant(name),
}
d[tag] = pdfreference(pdfflushobject(f))
end
return d
end
end
-- cache
local function fieldattributes(specification)
--~ return pdfarray {
--~ -- BG = -- backgroundcolor
--~ -- BC = -- framecolor
--~ }
return nil
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 = aux.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 { -- cache this one
N = registeredsymbol(n), R = registeredsymbol(r), D = registeredsymbol(d),
}
return lpdf.sharedobj(tostring(appearance))
end
local function fieldstates(specification,forceyes,values,default)
-- 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 then
-- error
return
end
local v = aux.settings_to_array(values)
local yes, off
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 = aux.settings_to_array(yesshown)
local offshown, offvalue = lpegmatch(splitter,off)
if not (offshown and offvalue) then
offshown = off, off
end
off = aux.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 = yesn
end
if not offvalue then
offvalue = offn
end
if forceyes == true then
forceyes = forceyes and "On" -- 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 = pdfconstant("Off")
end
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
end
local function fieldoptions(specification)
local values = specification.values
local default = specification.default
if values then
local v = aux.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 function radiodefault(parent,field,forceyes)
local default, values = parent.default, parent.values
if not default or default == "" then
values = aux.settings_to_array(values)
default = values[1]
end
local name = field.name
local fieldvalues = aux.settings_to_array(field.values)
local yes, off = fieldvalues[1], fieldvalues[2] or fieldvalues[1]
if not default then
return pdfconstant((forceyes and "On") or yes)
elseif default == name then
return pdfconstant((forceyes and "On") or default)
else
return pdfconstant("Off")
end
end
-- layers
local function fieldlayer(specification) -- we can move this in line
local layer = specification.layer
return (layer and lpdf.layerreferences[layer]) or nil
end
-- defining
local fields, radios, clones, fieldsets, calculationset = { }, { }, { }, { }, nil
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
local function predefinesymbols(specification)
local values = specification.values
if values then
local symbols = aux.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 = aux.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
if default then
tex.sprint(ctxcatcodes,default)
end
end
end
function codeinjections.definefield(specification)
local n = specification.name
local f = fields[n]
if not f then
local kind = specification.kind
if not kind then
if trace_fields then
logs.report("fields","invalid definition of '%s': unknown type",n)
end
elseif kind == "radio" then
local values = specification.values
if values and values ~= "" then
values = aux.settings_to_array(values)
for v=1,#values do
radios[values[v]] = { parent = n }
end
fields[n] = specification
if trace_fields then
logs.report("fields","defining '%s' as radio",n or "?")
end
elseif trace_fields then
logs.report("fields","invalid definition of radio '%s': missing values",n)
end
elseif kind == "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
logs.report("fields","defining '%s' as sub of radio '%s'",n or "?",p or "?")
end
elseif trace_fields then
logs.report("fields","invalid definition of radio sub '%s': no parent",n)
end
predefinesymbols(specification)
elseif kind == "text" or kind == "line" then
fields[n] = specification
if trace_fields then
logs.report("fields","defining '%s' as %s",n,kind)
end
if specification.values ~= "" and specification.default == "" then
specification.default, specification.values = specification.values, nil
end
else
fields[n] = specification
if trace_fields then
logs.report("fields","defining '%s' as %s",n,kind)
end
predefinesymbols(specification)
end
elseif trace_fields then
logs.report("fields","invalid definition of '%s': already defined",n)
end
end
function codeinjections.clonefield(specification)
local p, c, v = specification.parent, specification.children, specification.variant
if not p or not c then
if trace_fields then
logs.report("fields","invalid clone: children: '%s', parent '%s', variant: '%s'",p or "?",c or "?", v or "?")
end
else
for n in gmatch(c,"[^, ]+") do
local f, r, c, x = fields[n], radios[n], clones[n], fields[p]
if f or r or c then
if trace_fields then
logs.report("fields","already cloned: child: '%s', parent '%s', variant: '%s'",p or "?",n or "?", v or "?")
end
elseif x then
if trace_fields then
logs.report("fields","invalid clone: child: '%s', variant: '%s', no parent",n or "?", v or "?")
end
else
if trace_fields then
logs.report("fields","cloning: child: '%s', parent '%s', variant: '%s'",p or "?",n or "?", v or "?")
end
clones[n] = specification
predefinesymbols(specification)
end
end
end
end
function codeinjections.getfieldgroup(name)
local f = fields[name] or radios[name] or clones[name]
local g = f and f.group
if not g or g == "" then
local v, p, k = f.variant, f.parent, f.kind
if v == "clone" or v == "copy" then
f = fields[p] or radios[p]
g = f and f.group
elseif k == "sub" then
f = fields[p]
g = f and f.group
end
end
if g then
texsprint(ctxcatcodes,g)
end
end
--
function codeinjections.doiffieldset(tag)
commands.testcase(fieldsets[tag])
end
function codeinjections.doiffieldelse(name)
commands.testcase(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.options
if so and so ~= "" then
specification.options = so .. "," .. option
else
specification.options = option
end
return specification
end
-- finish
local collected = pdfarray()
local function finishfields()
for name, field in next, fields do
local kids = field.kids
if kids then
pdfflushobject(field.kobj,kids)
end
local pobj = field.pobj
end
for name, field in next, radios do
local kids = field.kids
if kids then
pdfflushobject(field.kobj,kids)
end
end
if #collected > 0 then
usedfonts.tttf = fontnames.tt.tf
local acroform = pdfdictionary {
NeedAppearances = true,
Fields = pdfreference(pdfflushobject(collected)),
DR = pdfdictionary { Font = registerfonts() },
CO = fieldsetlist(calculationset),
DA = "/tttf 12 Tf 0 g",
}
lpdf.addtocatalog("AcroForm",pdfreference(pdfflushobject(acroform)))
end
end
lpdf.registerdocumentfinalizer(finishfields)
local pdf_widget = pdfconstant("Widget")
local pdf_tx = pdfconstant("Tx")
local pdf_ch = pdfconstant("Ch")
local pdf_btn = pdfconstant("Btn")
local pdf_yes = pdfconstant("Yes")
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 methods = { }
function codeinjections.typesetfield(name,specification)
local field = fields[name] or radios[name] or clones[name]
if not field then
logs.report("fields", "unknown child '%s'",name)
-- unknown field
return
end
local variant, parent = field.variant, field.parent
if variant == "copy" or variant == "clone" then -- only in clones
field = fields[parent] or radios[parent]
end
local method = methods[field.kind]
if method then
method(name,specification,variant)
else
logs.report("fields", "unknown method '%s' for child '%s'",field.kind,name)
end
end
-- can be optional multipass optimization (share objects)
local function save_parent(field,specification,d)
local kn = pdfreserveobject()
d.Kids = pdfreference(kn)
field.kobj = kn
field.kids = pdfarray()
local pn = pdfflushobject(d)
field.pobj = pn
collected[#collected+1] = pdfreference(pn)
end
local function save_kid(field,specification,d)
local kn = pdfreserveobject()
field.kids[#field.kids+1] = pdfreference(kn)
node.write(pdfannotation(specification.width,specification.height,0,d(),kn))
end
function methods.line(name,specification,variant,extras)
local field = fields[name]
if variant == "copy" or variant == "clone" then
logs.report("fields","todo: clones of text fields")
end
local kind = field.kind
if not field.pobj then
if trace_fields then
logs.report("fields","using parent text '%s'",name)
end
if extras then
enhance(specification,extras)
end
local text = pdfunicode(field.default)
local d = pdfdictionary {
Subtype = pdf_widget,
T = pdfunicode(specification.title),
F = fieldplus(specification),
Ff = fieldflag(specification),
OC = fieldlayer(specification),
MK = fieldsurrounding(specification), -- needed ?
DA = fieldsurrounding(specification),
AA = fieldactions(specification),
FT = pdf_tx,
Q = fieldalignment(specification),
MaxLen = (specification.length == 0 and 1000) or specification.length,
DV = text,
V = text,
}
save_parent(field,specification,d)
field.specification = specification
end
specification = field.specification or { } -- todo: radio spec
if trace_fields then
logs.report("fields","using child text '%s'",name)
end
local d = pdfdictionary {
Subtype = pdf_widget,
Parent = pdfreference(field.pobj),
F = fieldplus(specification),
DA = fieldattributes(specification),
OC = fieldlayer(specification),
MK = fieldsurrounding(specification),
DA = fieldsurrounding(specification),
AA = fieldactions(specification),
Q = fieldalignment(specification),
}
save_kid(field,specification,d)
end
function methods.text(name,specification,variant)
methods.line(name,specification,variant,"MultiLine")
end
function methods.choice(name,specification,variant,extras)
local field = fields[name]
if variant == "copy" or variant == "clone" then
logs.report("fields","todo: clones of choice fields")
end
local kind = field.kind
local d
if not field.pobj then
if trace_fields then
logs.report("fields","using parent choice '%s'",name)
end
if extras then
enhance(specification,extras)
end
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),
}
save_parent(field,specification,d)
field.specification = specification
end
specification = field.specification or { }
if trace_fields then
logs.report("fields","using child choice '%s'",name)
end
local d = pdfdictionary {
Subtype = pdf_widget,
Parent = pdfreference(field.pobj),
F = fieldplus(specification),
DA = fieldattributes(specification),
OC = fieldlayer(specification),
AA = fieldactions(specification),
}
save_kid(field,specification,d)
end
function methods.popup(name,specification,variant)
methods.choice(name,specification,variant,"PopUp")
end
function methods.combo(name,specification,variant)
methods.choice(name,specification,variant,"PopUp,Edit")
end
-- 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,variant)
-- 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]
if variant == "copy" or variant == "clone" then
logs.report("fields","todo: clones of check fields")
end
local kind = field.kind
local appearance, default = fieldstates(field,true)
if not field.pobj then
if trace_fields then
logs.report("fields","using parent check '%s'",name)
end
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,
DV = default,
V = default,
AS = default,
AP = appearance,
H = pdf_n,
}
save_parent(field,specification,d)
field.specification = specification
end
specification = field.specification or { } -- todo: radio spec
if trace_fields then
logs.report("fields","using child check '%s'",name)
end
local d = pdfdictionary {
Subtype = pdf_widget,
Parent = pdfreference(field.pobj),
F = fieldplus(specification),
DA = fieldattributes(specification),
OC = fieldlayer(specification),
AA = fieldactions(specification),
DV = default,
V = default,
AS = default,
AP = appearance,
H = pdf_n,
}
save_kid(field,specification,d)
end
function methods.push(name,specification,variant)
local field = fields[name]
if variant == "copy" or variant == "clone" then
logs.report("fields","todo: clones of push fields")
end
local kind = field.kind
if not field.pobj then
if trace_fields then
logs.report("fields","using parent push '%s'",name)
end
enhance(specification,"PushButton")
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)
field.specification = specification
end
specification = field.specification or { } -- todo: radio spec
if trace_fields then
logs.report("fields","using child push '%s'",name)
end
local d = pdfdictionary {
Subtype = pdf_widget,
Parent = pdfreference(field.pobj),
F = fieldplus(specification),
DA = fieldattributes(specification),
OC = fieldlayer(specification),
AA = fieldactions(specification),
AP = fieldappearances(field),
H = pdf_p,
}
save_kid(field,specification,d)
end
function methods.sub(name,specification,variant)
local field = radios[name] or fields[name] or clones[name] -- fields in case of a clone, maybe use dedicated clones
local values
if variant == "copy" or variant == "clone" then
name = field.parent
values = field.values -- clone only, copy has nil so same as parent
field = radios[name]
else
values = field.values
end
local parent = fields[field.parent]
if not parent then
return
end
local appearance = fieldstates(field,name,values) -- we need to force the 'On' name
local default = radiodefault(parent,field)
if not parent.pobj then
if trace_fields then
logs.report("fields","using parent '%s' of radio '%s' with values '%s' and default '%s'",parent.name,name,parent.values or "?",parent.default or "?")
end
local specification = parent.specification or { }
-- enhance(specification,"Radio,RadiosInUnison")
enhance(specification,"RadiosInUnison") -- maybe also PushButton as acrobat does
local d = pdfdictionary {
T = parent.name,
FT = pdf_btn,
Rect = pdf_no_rect,
F = fieldplus(specification),
Ff = fieldflag(specification),
H = pdf_n,
V = default,
}
save_parent(parent,specification,d)
end
if trace_fields then
logs.report("fields","using child radio '%s' with values '%s'",name,values or "?")
end
local d = pdfdictionary {
Subtype = pdf_widget,
Parent = pdfreference(parent.pobj),
F = fieldplus(specification),
DA = fieldattributes(specification),
OC = fieldlayer(specification),
AA = fieldactions(specification),
AS = default,
AP = appearance,
H = pdf_n,
}
save_kid(parent,specification,d)
end
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