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if not modules then modules = { } end modules ['toks-aux'] = {
    version   = 1.001,
    author    = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
    copyright = "PRAGMA ADE / ConTeXt Development Team",
    license   = "see context related readme files"
}

local type, tostring = type, tostring
local max = math.max
local formatters, gsub, char = string.formatters, string.gsub, string.char
local concat = table.concat

local function flags(t)
    if type(t) == "string" then
        t = token.create(t)
    end
    local r = { }
    if t.frozen    then r[#r+1] = "frozen"    end
    if t.permanent then r[#r+1] = "permanent" end
    if t.immutable then r[#r+1] = "immutable" end
    if t.primitive then r[#r+1] = "primitive" end
    if t.mutable   then r[#r+1] = "mutable"   end
    if t.noaligned then r[#r+1] = "noaligned" end
    if t.instance  then r[#r+1] = "instance"  end
    if t.tolerant  then r[#r+1] = "tolerant"  end
    if t.protected then r[#r+1] = "protected" end
    return r
end

tokens.flags= flags

interfaces.implement {
    name      = "showluatokens",
    public    = true,
    protected = true,
    actions   = function()
        local f0 = formatters["%s: %s"]
        local nl = logs.newline
        local wr = logs.writer
        local t  = token.peek_next() -- local t = token.scan_next() token.put_back(t)
        local n  = ""
        local w  = ""
        local c  = t.cmdname
        if c == "left_brace" then
            w = "given token list"
            t = token.scan_toks(false)
        elseif c == "register_toks" then
            token.scan_next()
            w = "token register"
            n = t.csname or t.index
            t = tex.gettoks(n,true)
        elseif c == "internal_toks" then
            token.scan_next()
            w = "internal token variable"
            n = t.csname or t.index
            t = tex.gettoks(n,true)
        else
            n = token.scan_csname()
            local r = flags(t)
            local m = token.get_meaning(n,true)
            r[#r+1] = "control sequence"
            if type(m) == "table" then
                t = m
            else
                t = { t }
            end
            w = concat(r, " ")
        end
        wr(f0(w,n))
        nl()
        if type(t) == "table" then
            local w1 = 4
            local w2 = 1
            local w3 = 3
            local w4 = 3
            for i=1,#t do
                local ti = t[i]
                w1 = max(w1,#tostring(ti.id))
                w2 = max(w2,#tostring(ti.command))
                w3 = max(w3,#tostring(ti.index))
                w4 = max(w4,#ti.cmdname)
            end
            local f1 = formatters["%" .. w1 .. "i  %" .. w2 .. "i  %" .. w3 .. "i  %-" .. w4 .. "s  %s"]
            local f2 = formatters["%" .. w1 .. "i  %" .. w2 .. "i  %" .. w3 .. "i  %-" .. w4 .. "s"]
            local f3 = formatters["%" .. w1 .. "i  %" .. w2 .. "i  %" .. w3 .. "i  %-" .. w4 .. "s  %C"]
            for i=1,#t do
                local ti = t[i]
                local cs = ti.csname
                local id = ti.id
                local ix = ti.index
                local cd = ti.command
                local cn = ti.cmdname
                if cn == "prefix" and not cs then
                    cs = "always enforced"
                end
                cn = gsub(cn,"_"," ")
                if cs then
                    wr(f1(id,cd,ix,cn,cs))
                elseif cn == "letter" or cn == "other char" then
                    wr(f3(id,cd,ix,cn,ix))
                elseif cn == "match" then
                    local s
                        if ix == 32 then s = "optional spacer"     -- space
                    elseif ix == 42 then s = "skip spaces"         -- *
                    elseif ix == 43 then s = "keep braces"         -- +
                    elseif ix == 45 then s = "thrash"              -- -
                    elseif ix == 47 then s = "prune"               -- /
                    elseif ix == 58 then s = "continue"            -- :
                    elseif ix == 59 then s = "quit"                -- ;
                    elseif ix == 61 then s = "mandate braces"      -- =
                    elseif ix == 94 then s = "keep spaces"         -- ^
                    elseif ix == 95 then s = "keep mandate braces" -- _
                    else                 s = "argument " .. char(ix)
                    end
                    wr(f1(id,cd,ix,cn,s))
                else
                    wr(f2(id,cd,ix,cn))
                    if cn == "end match" then
                        wr("--------------")
                    end
                end
            end
            nl()
        end
    end
}

-- For the moment here, will move to initex only (also see node-ini.lua); we need
-- to actually store these.

local groupcodes       = { }
local glyphoptioncodes = { }
local hyphenationcodes = { }
local frozenparcodes   = { }
local flagcodes        = { }
local normalizecodes   = { }

for k, v in next, tex.getgroupvalues() do
    groupcodes[k] = gsub(v,"[_ ]","")
end
for k, v in next, tex.gethyphenationvalues() do
    hyphenationcodes[k] = gsub(v,"[_ ]","")
end
for k, v in next, tex.getglyphoptionvalues() do
    glyphoptioncodes[k] = gsub(v,"[_ ]","")
end
for k, v in next, tex.getfrozenparvalues() do
    frozenparcodes[k] = gsub(v,"[_ ]","")
end
for k, v in next, tex.getflagvalues() do
    flagcodes[k] = gsub(v,"[_ ]","")
end
for k, v in next, tex.getnormalizevalues() do
    normalizecodes[k] = gsub(v,"[_ ]","")
end


if environment.initex then

    local texintegerdef = tex.integerdef

    for k, v in next, groupcodes       do texintegerdef(v .. "groupcode",          k,"immutable") end
    for k, v in next, glyphoptioncodes do texintegerdef(v .. "code",               k,"immutable") end
    for k, v in next, hyphenationcodes do texintegerdef(v .. "hyphenationmodecode",k,"immutable") end
    for k, v in next, frozenparcodes   do texintegerdef("frozen" .. v .. "code",   k,"immutable") end
    for k, v in next, flagcodes        do texintegerdef(v .. "flagcode",           k,"immutable") end
    for k, v in next, normalizecodes   do texintegerdef(v .. "code",               k,"immutable") end

end

groupcodes           = utilities.storage.allocate(table.swapped(groupcodes,      groupcodes))
glyphoptioncodes     = utilities.storage.allocate(table.swapped(glyphoptioncodes,glyphoptioncodes))
hyphenationcodes     = utilities.storage.allocate(table.swapped(hyphenationcodes,hyphenationcodes))
frozenparcodes       = utilities.storage.allocate(table.swapped(frozenparcodes,  frozenparcodes))
flagcodes            = utilities.storage.allocate(table.swapped(flagcodes,       flagcodes))
normalizecodes       = utilities.storage.allocate(table.swapped(normalizecodes,  normalizecodes))

tex.groupcodes       = groupcodes
tex.glyphoptioncodes = glyphoptioncodes
tex.hyphenationcodes = hyphenationcodes
tex.frozenparcodes   = frozenparcodes
tex.flagcodes        = flagcodes
tex.normalizecodes   = normalizecodes