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if not modules then modules = { } end modules ['lpdf-epa'] = {
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 a rather experimental feature and the code will probably
-- change.
local type, tonumber = type, tonumber
local format = string.format
local trace_links = false trackers.register("figures.links", function(v) trace_links = v end)
local report_link = logs.reporter("backend","merging")
local backends, lpdf = backends, lpdf
local variables = interfaces.variables
local codeinjections = backends.pdf.codeinjections
local layerspec = { -- predefining saves time
"epdflinks"
}
local function makenamespace(filename)
return format("lpdf-epa-%s-",file.removesuffix(file.basename(filename)))
end
local function add_link(x,y,w,h,destination,what)
if trace_links then
report_link("dx: % 4i, dy: % 4i, wd: % 4i, ht: % 4i, destination: %s, type: %s",x,y,w,h,destination,what)
end
local locationspec = { -- predefining saves time
x = x .. "bp",
y = y .. "bp",
preset = "leftbottom",
}
local buttonspec = {
width = w .. "bp",
height = h .. "bp",
offset = variables.overlay,
frame = trace_links and variables.on or variables.off,
}
context.setlayer (
layerspec,
locationspec,
function() context.button ( buttonspec, "", { destination } ) end
-- context.nested.button(buttonspec, "", { destination }) -- time this
)
end
local function link_goto(x,y,w,h,document,annotation,pagedata,namespace)
local destination = annotation.A.D -- [ 18 0 R /Fit ]
local what = "page"
if type(destination) == "string" then
local destinations = document.destinations
local wanted = destinations[destination]
destination = wanted and wanted.D
if destination then what = "named" end
end
local pagedata = destination and destination[1]
if pagedata then
local destinationpage = pagedata.number
if destinationpage then
add_link(x,y,w,h,namespace .. destinationpage,what)
end
end
end
local function link_uri(x,y,w,h,document,annotation)
local url = annotation.A.URI
if url then
add_link(x,y,w,h,format("url(%s)",url),"url")
end
end
local function link_file(x,y,w,h,document,annotation)
local filename = annotation.A.F
if filename then
local destination = annotation.A.D
if not destination then
add_link(x,y,w,h,format("file(%s)",filename),"file")
elseif type(destination) == "string" then
add_link(x,y,w,h,format("%s::%s",filename,destination),"file (named)")
else
destination = destination[1] -- array
if tonumber(destination) then
add_link(x,y,w,h,format("%s::page(%s)",filename,destination),"file (page)")
else
add_link(x,y,w,h,format("file(%s)",filename),"file")
end
end
end
end
function codeinjections.mergereferences(specification)
if figures and not specification then
specification = figures and figures.current()
specification = specification and specification.status
end
if specification then
local fullname = specification.fullname
local document = lpdf.epdf.load(fullname)
if document then
local pagenumber = specification.page or 1
local xscale = specification.yscale or 1
local yscale = specification.yscale or 1
local size = specification.size or "crop" -- todo
local pagedata = document.pages[pagenumber]
local annotations = pagedata.Annots
local namespace = format("lpdf-epa-%s-",file.removesuffix(file.basename(fullname)))
local reference = namespace .. pagenumber
if annotations.n > 0 then
local mediabox = pagedata.MediaBox
local llx, lly, urx, ury = mediabox[1], mediabox[2], mediabox[3], mediabox[4]
local width, height = xscale * (urx - llx), yscale * (ury - lly) -- \\overlaywidth, \\overlayheight
context.definelayer( { "epdflinks" }, { height = height.."bp" , width = width.."bp" })
for i=1,annotations.n do
local annotation = annotations[i]
local subtype = annotation.Subtype
local rectangle = annotation.Rect
local a_llx, a_lly, a_urx, a_ury = rectangle[1], rectangle[2], rectangle[3], rectangle[4]
local x, y = xscale * (a_llx - llx), yscale * (a_lly - lly)
local w, h = xscale * (a_urx - a_llx), yscale * (a_ury - a_lly)
if subtype == "Link" then
local linktype = annotation.A.S
if linktype == "GoTo" then
link_goto(x,y,w,h,document,annotation,pagedata,namespace)
elseif linktype == "GoToR" then
link_file(x,y,w,h,document,annotation)
elseif linktype == "URI" then
link_uri(x,y,w,h,document,annotation)
elseif trace_links then
report_link("unsupported link annotation '%s'",linktype)
end
elseif trace_links then
report_link("unsupported annotation '%s'",subtype)
end
end
context.flushlayer { "epdflinks" }
-- context("\\gdef\\figurereference{%s}",reference) -- global
context.setgvalue("figurereference",reference) -- global
if trace_links then
report_link("setting figure reference to '%s'",reference)
end
specification.reference = reference
return namespace
end
end
end
return ""-- no namespace, empty, not nil
end
function codeinjections.mergeviewerlayers(specification)
-- todo: parse included page for layers
if true then
return
end
if not specification then
specification = figures and figures.current()
specification = specification and specification.status
end
if specification then
local fullname = specification.fullname
local document = lpdf.epdf.load(fullname)
if document then
local namespace = format("lpdf:epa:%s:",file.removesuffix(file.basename(fullname)))
local layers = document.layers
if layers then
for i=1,layers.n do
local tag = layers[i]
tag = namespace .. string.gsub(tag," ",":")
local title = tag
if trace_links then
report_link("using layer '%s'",tag)
end
attributes.viewerlayers.define { -- also does some cleaning
tag = tag, -- todo: #3A or so
title = title,
visible = variables.start,
editable = variables.yes,
printable = variables.yes,
}
codeinjections.useviewerlayer(tag)
end
end
end
end
end
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