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if not modules then modules = { } end modules ['scrn-hlp'] = {
version = 1.001,
comment = "companion to scrn-hlp.mkiv",
author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
copyright = "PRAGMA ADE / ConTeXt Development Team",
license = "see context related readme files"
}
local tonumber = tonumber
local help = { }
interactions.help = help
local context = context
local implement = interfaces.implement
local formatters = string.formatters
local a_help = attributes.private("help")
local copy_node_list = node.copy_list
local hpack_node_list = node.hpack
local register_list = nodes.pool.register
local texgetbox = tex.getbox
local nodecodes = nodes.nodecodes
local hlist_code = nodecodes.hlist
local vlist_code = nodecodes.vlist
local data, references = { }, { }
local helpscript = [[
function Hide_All_Help(prefix) {
var n = 0
while (true) {
n += 1 ;
v = this.getField(prefix + n) ;
if (v) {
v.hidden = true ;
this.dirty = false ;
} else {
return ;
}
}
}
]]
local template = "javascript(Hide_All_Help{help:}),action(show{help:%s})"
local function register(specification)
local number = specification.number
local name = specification.name
local box = specification.box
if number and name and box then
if helpscript then
interactions.javascripts.setpreamble("HelpTexts",helpscript)
helpscript = false
end
local b = copy_node_list(texgetbox(box))
register_list(b)
data[number] = b
if name and name ~= "" then
references[name] = number
structures.references.define("",name,formatters[template](number))
end
end
end
local function collectused(head,used)
while head do
local id = head.id
if id == hlist_code then
local a = head[a_help]
if a then
if not used then
used = { a }
else
used[#used+1] = a
end
else
used = collectused(head.list,used)
end
elseif id == vlist_code then
used = collectused(head.list,used)
end
head = head.next
end
return used
end
local function collect(box)
if next(data) then
return collectused(texgetbox(box).list)
end
end
local function reference(name)
return references[name] or tonumber(name) or 0
end
help.register = register
help.collect = collect
help.reference = reference
implement {
name = "registerhelp",
actions = register,
arguments = {
{
{ "number", "integer" },
{ "name" },
{ "box" , "integer" }
}
}
}
implement {
name = "collecthelp",
arguments = "integer",
actions = function(box)
local used = collect(box)
if used then
local done = { }
context.startoverlay()
for i=1,#used do
local d = data[used[i]]
if d and not done[d] then
local box = hpack_node_list(copy_node_list(d))
context(false,box)
done[d] = true
else
-- error
end
end
context.stopoverlay()
end
end
}
implement {
name = "helpreference",
arguments = "string",
actions = function(name)
context(reference(name))
end
}
implement {
name = "helpaction",
arguments = "string",
actions = function(name)
context(template,reference(name))
end
}
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