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

-- maybe this will move to the context name space although the
-- plurals are unlikely to clash with future tex primitives
--
-- if tex.modes['xxxx'] then .... else .... end

local P, C, S, Cc, lpegmatch, patterns = lpeg.P, lpeg.C, lpeg.S, lpeg.Cc, lpeg.match, lpeg.patterns

local texgetcount       = tex.getcount
local texsetcount       = tex.setcount

local allocate          = utilities.storage.allocate
local setmetatableindex = table.setmetatableindex
local setmetatablecall  = table.setmetatablecall

local context           = context

tex.modes               = allocate { }
tex.systemmodes         = allocate { }
tex.constants           = allocate { }
tex.conditionals        = allocate { }
tex.ifs                 = allocate { }
tex.isdefined           = allocate { }

local modes             = { }
local systemmodes       = { }

-- if newtoken then -- we keep the old code for historic reasons

    -- undefined: mode == 0 or cmdname = "undefined_cs"

    local create = newtoken.create

    local cache = table.setmetatableindex(function(t,k)
        local v = create(k)
        t[k] = v
        return v
    end)

    -- we can have a modes cache too

    local iftrue    = cache["iftrue"].mode
    local undefined = cache["*undefined*crap*"].mode -- is this ok?

    setmetatableindex(tex.modes, function(t,k)
        local m = modes[k]
        if m then
            return m()
        else
            local n = "mode>" .. k
            if cache[n].mode == 0 then
                return false
            else
                modes[k] = function() return texgetcount(n) == 1 end
                return texgetcount(n) == 1 -- 2 is prevented
            end
        end
    end)

    setmetatableindex(tex.systemmodes, function(t,k)
        local m = systemmodes[k]
        if m then
            return m()
        else
            local n = "mode>*" .. k
            if cache[n].mode == 0 then
                return false
            else
                systemmodes[k] = function() return texgetcount(n) == 1 end
                return texgetcount(n) == 1 -- 2 is prevented
            end
        end
    end)

    setmetatableindex(tex.constants, function(t,k)
        return cache[k].mode ~= 0 and texgetcount(k) or 0
    end)

    setmetatableindex(tex.conditionals, function(t,k) -- 0 == true
        return cache[k].mode ~= 0 and texgetcount(k) == 0
    end)

    table.setmetatableindex(tex.ifs, function(t,k)
     -- local mode = cache[k].mode
     -- if mode == 0 then
     --     return nil
     -- else
     --     return mode == iftrue
     -- end
        return cache[k].mode == iftrue
    end)

    setmetatableindex(tex.isdefined, function(t,k)
        return k and cache[k].mode ~= 0
    end)

    setmetatablecall(tex.isdefined, function(t,k)
        return k and cache[k].mode ~= 0
    end)

    local dimencode   = cache["scratchdimen"  ].command
    local countcode   = cache["scratchcounter"].command
    local tokencode   = cache["scratchtoken"  ].command
    local skipcode    = cache["scratchskip"   ].command

    local types = {
        [dimencode] = "dimen",
        [countcode] = "count",
        [tokencode] = "token",
        [skipcode ] = "skip",
    }

    function tex.isdimen(name)
        return cache[name].command == dimencode
    end

    function tex.iscount(name)
        return cache[name].command == countcode
    end

    function tex.istoken(name)
        return cache[name].command == tokencode
    end

    function tex.isskip(name)
        return cache[name].command == skipcode
    end

    function tex.type(name)
        return types[cache[name].command] or "macro"
    end

-- else
--
--     local csname_id = token.csname_id
--     local create    = token.create
--
--     local undefined = csname_id("*undefined*crap*")
--     local iftrue    = create("iftrue")[2] -- inefficient hack
--
--     setmetatableindex(tex.modes, function(t,k)
--         local m = modes[k]
--         if m then
--             return m()
--         else
--             local n = "mode>" .. k
--             if csname_id(n) == undefined then
--                 return false
--             else
--                 modes[k] = function() return texgetcount(n) == 1 end
--                 return texgetcount(n) == 1 -- 2 is prevented
--             end
--         end
--     end)
--
--     setmetatableindex(tex.systemmodes, function(t,k)
--         local m = systemmodes[k]
--         if m then
--             return m()
--         else
--             local n = "mode>*" .. k
--             if csname_id(n) == undefined then
--                 return false
--             else
--                 systemmodes[k] = function() return texgetcount(n) == 1 end
--                 return texgetcount(n) == 1 -- 2 is prevented
--             end
--         end
--     end)
--
--     setmetatableindex(tex.constants, function(t,k)
--         return csname_id(k) ~= undefined and texgetcount(k) or 0
--     end)
--
--     setmetatableindex(tex.conditionals, function(t,k) -- 0 == true
--         return csname_id(k) ~= undefined and texgetcount(k) == 0
--     end)
--
--     setmetatableindex(tex.ifs, function(t,k)
--      -- k = "if" .. k -- better not
--         return csname_id(k) ~= undefined and create(k)[2] == iftrue -- inefficient, this create, we need a helper
--     end)
--
--     setmetatableindex(tex.isdefined, function(t,k)
--         return k and csname_id(k) ~= undefined
--     end)
--     setmetatablecall(tex.isdefined, function(t,k)
--         return k and csname_id(k) ~= undefined
--     end)
--
--     local lookuptoken = token.lookup
--
--     local dimencode   = lookuptoken("scratchdimen"  )[1]
--     local countcode   = lookuptoken("scratchcounter")[1]
--     local tokencode   = lookuptoken("scratchtoken"  )[1]
--     local skipcode    = lookuptoken("scratchskip"   )[1]
--
--     local types = {
--         [dimencode] = "dimen",
--         [countcode] = "count",
--         [tokencode] = "token",
--         [skipcode ] = "skip",
--     }
--
--     function tex.isdimen(name)
--         return lookuptoken(name)[1] == dimencode
--     end
--
--     function tex.iscount(name)
--         return lookuptoken(name)[1] == countcode
--     end
--
--     function tex.istoken(name)
--         return lookuptoken(name)[1] == tokencode
--     end
--
--     function tex.isskip(name)
--         return lookuptoken(name)[1] == skipcode
--     end
--
--     function tex.type(name)
--         return types[lookuptoken(name)[1]] or "macro"
--     end
--
-- end

function context.setconditional(name,value)
    if value then
        context.settruevalue(name)
    else
        context.setfalsevalue(name)
    end
end

----  arg = P("{") * C(patterns.nested) * P("}") + Cc("")

local sep = S("), ")
local str = C((1-sep)^1)
local tag = P("(") * C((1-S(")" ))^1) * P(")")
local arg = P("(") * C((1-S("){"))^1) * P("{") * C((1-P("}"))^0) * P("}") * P(")")

local pattern = (
     P("lua") * tag        / context.luasetup
  +  P("xml") * arg        / context.setupwithargument -- or xmlw as xmlsetup has swapped arguments
  + (P("tex") * tag + str) / context.texsetup
  +             sep^1
)^1

interfaces.implement {
    name      = "autosetups",
    actions   = function(str) lpegmatch(pattern,str) end,
    arguments = "string"
}

