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if not modules then modules = { } end modules ['core-two'] = {
    version   = 1.001,
    comment   = "companion to core-two.mkiv",
    author    = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
    copyright = "PRAGMA ADE / ConTeXt Development Team",
    license   = "see context related readme files"
}

-- This is actually one of the oldest MkIV files and basically a port of MkII but
-- the old usage has long be phased out. Also, the public part is now handled by
-- datasets which makes this a more private store.

-- local next = next
-- local remove, concat = table.remove, table.concat

local allocate = utilities.storage.allocate

local collected = allocate()
local tobesaved = allocate()

local jobpasses = {
    collected = collected,
    tobesaved = tobesaved,
}

job.passes = jobpasses

local function initializer()
    collected = jobpasses.collected
    tobesaved = jobpasses.tobesaved
end

job.register('job.passes.collected', tobesaved, initializer, nil)

function jobpasses.getcollected(id)
    return collected[id] or { }
end

function jobpasses.gettobesaved(id)
    local t = tobesaved[id]
    if not t then
        t = { }
        tobesaved[id] = t
    end
    return t
end

-- local function define(id)
--     local p = tobesaved[id]
--     if not p then
--         p = { }
--         tobesaved[id] = p
--     end
--     return p
-- end
--
-- local function save(id,str,index)
--     local jti = define(id)
--     if index then
--         jti[index] = str
--     else
--         jti[#jti+1] = str
--     end
-- end
--
-- local function savetagged(id,tag,str)
--     local jti = define(id)
--     jti[tag] = str
-- end
--
-- local function getdata(id,index,default)
--     local jti = collected[id]
--     local value = jti and jti[index]
--     return value ~= "" and value or default or ""
-- end
--
-- local function getfield(id,index,tag,default)
--     local jti = collected[id]
--     jti = jti and jti[index]
--     local value = jti and jti[tag]
--     return value ~= "" and value or default or ""
-- end
--
-- local function getcollected(id)
--     return collected[id] or { }
-- end
--
-- local function gettobesaved(id)
--     return define(id)
-- end
--
-- local function get(id)
--     local jti = collected[id]
--     if jti and #jti > 0 then
--         return remove(jti,1)
--     end
-- end
--
-- local function first(id)
--     local jti = collected[id]
--     return jti and jti[1]
-- end
--
-- local function last(id)
--     local jti = collected[id]
--     return jti and jti[#jti]
-- end
--
-- local function find(id,n)
--     local jti = collected[id]
--     return jti and jti[n] or nil
-- end
--
-- local function count(id)
--     local jti = collected[id]
--     return jti and #jti or 0
-- end
--
-- local function list(id)
--     local jti = collected[id]
--     if jti then
--         return concat(jti,',')
--     end
-- end
--
-- local function inlist(id,str)
--     local jti = collected[id]
--     if jti then
--         for _, v in next, jti do
--             if v == str then
--                 return true
--             end
--         end
--     end
--     return false
-- end
--
-- local check = first
--
-- jobpasses.define       = define
-- jobpasses.save         = save
-- jobpasses.savetagged   = savetagged
-- jobpasses.getdata      = getdata
-- jobpasses.getfield     = getfield
-- jobpasses.getcollected = getcollected
-- jobpasses.gettobesaved = gettobesaved
-- jobpasses.get          = get
-- jobpasses.first        = first
-- jobpasses.last         = last
-- jobpasses.find         = find
-- jobpasses.list         = list
-- jobpasses.count        = count
-- jobpasses.check        = check
-- jobpasses.inlist       = inlist
--
-- -- interface
--
-- local implement = interfaces.implement
--
-- implement { name = "gettwopassdata",     actions = { get,   context }, arguments = "string" }
-- implement { name = "getfirsttwopassdata",actions = { first, context }, arguments = "string" }
-- implement { name = "getlasttwopassdata", actions = { last,  context }, arguments = "string" }
-- implement { name = "findtwopassdata",    actions = { find,  context }, arguments = "2 strings" }
-- implement { name = "gettwopassdatalist", actions = { list,  context }, arguments = "string" }
-- implement { name = "counttwopassdata",   actions = { count, context }, arguments = "string" }
-- implement { name = "checktwopassdata",   actions = { check, context }, arguments = "string" }
--
-- implement {
--     name      = "definetwopasslist",
--     actions   = define,
--     arguments = "string"
-- }
--
-- implement {
--     name      = "savetwopassdata",
--     actions   = save,
--     arguments = "2 strings",
-- }
--
-- implement {
--     name      = "savetaggedtwopassdata",
--     actions   = savetagged,
--     arguments = "3 strings",
-- }
--
-- implement {
--     name      = "doifelseintwopassdata",
--     actions   = { inlist, commands.doifelse },
--     arguments = "2 strings",
-- }
--
-- -- local ctx_latelua = context.latelua
--
-- -- implement {
-- --     name      = "lazysavetwopassdata",
-- --     arguments = "3 strings",
-- --     public    = true,
-- --     actions   = function(a,b,c)
-- --         ctx_latelua(function() save(a,c) end)
-- --     end,
-- -- }
--
-- -- implement {
-- --     name      = "lazysavetaggedtwopassdata",
-- --     arguments = "3 strings",
-- --     public    = true,
-- --     actions   = function(a,b,c)
-- --         ctx_latelua(function() savetagged(a,b,c) end)
-- --     end,
-- -- }