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if not modules then modules = { } end modules ['lpdf-epd'] = {
version = 1.001,
comment = "companion to lpdf-epa.mkiv",
author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
copyright = "PRAGMA ADE / ConTeXt Development Team",
license = "see context related readme files"
}
-- This is an experimental layer around the epdf library. Because that
-- library is not yet finished and will get a clear api (independent of
-- the underlying pdf library which has an instable api) it will take
-- a while before this module is completed. Also, some integration with
-- other lpdf code might happen (i.e. we might generate lpdf objects).
local setmetatable, rawset = setmetatable, rawset
-- used:
--
-- arrayGet arrayGetNF dictLookup getTypeName arrayGetLength
-- getNum getString getBool getName getRef
-- getResourceDict getMediaBox getCropBox getBleedBox getTrimBox getArtBox
-- getPageRef getKindName findDestgetNumPages getDests getPage getCatalog getAnnots
--
-- needed:
--
-- add accessor methods to the resource dict
-- a function to mark objects as to be included
local lpdf = lpdf
-- -- -- helpers -- -- --
local cache_lookups = false
local checked_access
local array_access = {
__index = function(t,k)
local d = t.__data__
if tonumber(k) then
return checked_access(t,k,d:arrayGetNF(k))
elseif k == "all" then
local result = { }
for i=1,t.size do
result[i] = checked_access(t,k,d:arrayGetNF(i))
end
return result
elseif k == "width" then
return checked_access(t,k,d:arrayGetNF(3)) - checked_access(t,k,d:arrayGetNF(1))
elseif k == "height" then
return checked_access(t,k,d:arrayGetNF(4)) - checked_access(t,k,d:arrayGetNF(2))
end
end,
}
local dictionary_access = {
__index = function(t,k)
return checked_access(t,k,t.__data__:dictLookup(k))
end
}
checked_access = function(tab,key,v)
local n = v:getTypeName()
--~ print("!!!!!!!!!!!!!!",n)
if n == "array" then
local t = { __data__ = v, size = v:arrayGetLength() }
setmetatable(t,array_access)
if cache_lookups then rawset(tab,key,t) end
return t
elseif n == "dictionary" then
local t = { __data__ = v, }
setmetatable(t,dictionary_access)
if cache_lookups then rawset(tab,key,t) end
return t
elseif n == "real" or n == "integer" then
return v:getNum()
elseif n == "string" then
return v:getString()
elseif n == "boolean" then
return v:getBool()
elseif n == "name" then
return v:getName()
elseif n == "ref" then
return v:getRef(v.num,v.gen)
else
return v
end
end
local basic_annots_access = {
__index = function(t,k)
local a = {
__data__ = t.__data__:arrayGet(k),
}
setmetatable(a,dictionary_access)
if cache_lookups then rawset(t,k,a) end
return a
end
}
local basic_resources_access = { -- == dictionary_access
__index = function(t,k)
--~ local d = t.__data__
--~ print(d)
--~ print(d:getTypeName())
return checked_access(t,k,t.__data__:dictLookup(k))
end
}
local basic_box_access = { -- here it makes sense to do the rawset
__index = function(t,k)
local d = t.__data__
if k == "all" then return { d.x1, d.y1, d.x2, d.y2 }
elseif k == "width" then return d.x2 - d.x1
elseif k == "height" then return d.y2 - d.y1
elseif k == 1 or k == "llx" then return d.x1
elseif k == 2 or k == "lly" then return d.y1
elseif k == 3 or k == "urx" then return d.x2
elseif k == 4 or k == "lly" then return d.y2
else return 0 end
end
}
-- -- -- pages -- -- --
local page_access = {
__index = function(t,k)
local d = t.__data__
if k == "Annots" then
local annots = d:getAnnots()
local a = {
__data__ = annots,
size = annots:arrayGetLength()
}
setmetatable(a,basic_annots_access)
rawset(t,k,a)
return a
elseif k == "Resources" then
local r = {
__data__ = d:getResourceDict(),
}
setmetatable(r,basic_resources_access)
rawset(t,k,r)
return r
elseif k == "MediaBox" or k == "TrimBox" or k == "CropBox" or k == "ArtBox" or k == "BleedBox" then
local b = {
-- __data__ = d:getMediaBox(),
__data__ = d["get"..k](d),
}
setmetatable(b,basic_box_access)
rawset(t,k,b)
return b
end
end
}
-- -- -- catalog -- -- --
local destination_access = {
__index = function(t,k)
if k == "D" then
local d = t.__data__
local p = {
d:getPageRef(k), d:getKindName(k)
}
if cache_lookups then rawset(t,k,p) end -- not needed
return p
end
end
}
local destinations_access = {
__index = function(t,k)
local d = t.__catalog__
local p = {
__data__ = d:findDest(k),
}
setmetatable(p,destination_access)
if cache_lookups then rawset(t,k,p) end
return p
end
}
local catalog_access = {
__index = function(t,k)
local c = t.__catalog__
if k == "Pages" then
local s = c:getNumPages()
local r = {
}
local p = {
__catalog__ = c,
size = s,
references = r,
}
-- we load all pages as we need to resolve refs
for i=1,s do
local di, ri = c:getPage(i), c:getPageRef(i)
local pi = {
__data__ = di,
reference = ri,
number = i,
}
setmetatable(pi,page_access)
p[i], r[ri.num] = pi, i
end
-- setmetatable(p,pages_access)
rawset(t,k,p)
return p
elseif k == "Destinations" or k == "Dest" then
local d = c:getDests()
local p = {
__catalog__ = c,
}
setmetatable(p,destinations_access)
rawset(t,k,p)
return p
elseif k == "Metadata" then
local m = c:readMetadata()
local p = { -- we fake a stream dictionary
__catalog__ = c,
stream = m,
Type = "Metadata",
Subtype = "XML",
Length = #m,
}
-- rawset(t,k,p)
return p
end
end
}
local document_access = {
__index = function(t,k)
if k == "Catalog" then
local c = {
__catalog__ = t.__root__:getCatalog(),
}
setmetatable(c,catalog_access)
rawset(t,k,c)
return c
end
end
}
function lpdf.load(filename)
local document = {
__root__ = epdf.open(filename),
filename = filename,
}
setmetatable(document,document_access)
return document
end
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