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

local tostring = tostring

local takebox = tex.takebox

-- In principle we could use the slot number and make more complex left/right driven
-- shapes but not for now.

local function renderextensible(target,fnt,chr,size,width,height,depth,linewidth,axis,exheight,emwidth)
    local properties = mathematics.getextensibledata(target)
    if properties then
        local mp = properties.mp
        if mp and mp ~= "" then
            local uc = properties.unicode
            if uc then
                mp = string.formatters["%s:%05X"](mp,uc)
            end
            token.expandmacro(
                "math_extensible_mp",
                true,mp,
                true,tostring(width),
                true,tostring(height),
                true,tostring(depth),
                true,tostring(linewidth),
                true,tostring(axis),
                true,tostring(exheight),
                true,tostring(emwidth)
            )
            local result = takebox("globalscratchbox")
            nodes.setattrlist(result,target)
            return result
        end
    end
end

mathematics.renderextensible = renderextensible

interfaces.implement {
    name      = "set_extensible_data",
    arguments = { {
        { "mp" },
        { "left", "integer" },
        { "right", "integer" },
        { "middle", "integer" },
        { "unicode", "integer" },
    } },
    actions   = mathematics.setextensibledata,
}

interfaces.implement {
    name      = "registermpextensible",
    arguments = "integer",
    public    = true,
    protected = true,
    actions   = function(unicode)
        mathematics.registerextensible {
            method  = "mp",
            action  = renderextensible,
            unicode = unicode,
        }
    end,
}

local status_mathfun = logs.messenger("mathfun")

local patterns = {
    "math-mps-imp-%s.mkxl",
    "meta-mps-imp-%s.tex",
}

local function action(name,foundname)
    commands.loadlibrary(name,foundname,false)
    status_mathfun("library %a is loaded",name)
end

local function failure(name)
    report_mathfun("library %a is unknown or invalid",name)
end

interfaces.implement {
    name      = "usemathpluginlibrary",
 -- arguments = "string",
    arguments = "optional",
    public    = true,
    protected = true,
    actions   = function(name)
        resolvers.uselibrary {
            name     = name,
            patterns = patterns,
            action   = action,
            failure  = failure,
            onlyonce = true,
        }
    end
}