use "lib/core.nom"

compile [@%var] to:
    lua> ".."
        local key_lua = repr(\%var.value);
        local key_attr = (key_lua:match("'([a-zA-Z][a-zA-Z0-9]*)'")
                       or key_lua:match('"([a-zA-Z][a-zA-Z0-9]*)"'));
        if key_attr then
            return "_me."..key_attr;
        elseif key_lua:sub(1,1) == "[" then
            key_lua = " "..key_lua.." ";
        end
        return "_me["..key_lua.."]";

compile [set @%var = %val] to code:
    lua> ".."
        local val_lua = \(%val as lua);
        local key_lua = repr(\%var.value);
        local key_attr = (key_lua:match("'([a-zA-Z][a-zA-Z0-9]*)'")
                       or key_lua:match('"([a-zA-Z][a-zA-Z0-9]*)"'));
        if key_attr then
            return "_me."..key_attr.." = "..val_lua..";";
        elseif key_lua:sub(1,1) == "[" then
            key_lua = " "..key_lua.." ";
        end
        return "_me["..key_lua.."] = "..val_lua..";";

compile [object %classname %class_body] to:
    local [%methods, %class_identifier]
    set %class_identifier = (=lua "nomsu:var_to_lua_identifier(\(%classname as value)):sub(2,-1)")
    if (%class_identifier == ""):
        set %class_identifier = "class"
    set %methods = []
    for %line in (%class_body's "value"):
        if ((%line's "type") == "Comment"): do next %line
        assume (((%line's "type") == "FunctionCall") and ((%line's "stub") == "action % %"))
        ..or barf "Only action definitions are supported inside 'object % %', not \(%line's "src")"
        lua> ".."
            assert(\%line.value[3].type == "Block",
                "Invalid type for action definition body. Expected Block, but got: "..tostring(\%line.value[3].type));
            local names, args = nomsu:parse_spec(\%line.value[2]);
            local stub = nomsu:get_stub(names[1]);
            local body_lua = nomsu:tree_to_lua(\%line.value[3]);
            body_lua = body_lua.statements or ("return "..body_lua.expr..";");
            local arg_nomsus = {};
            for i, arg in ipairs(args) do arg_nomsus[i] = "nomsu:tree_to_lua("..arg..").expr"; end
            table.insert(\%methods, ([==[
                %s[ %s] = function(%s)
                    %s
                end
                nomsu:define_compile_action(%s, %s, function(%s)
                    return {expr="("..nomsu:tree_to_lua(_me).expr..")[ "..%s.."]("..%s..")"};
                end, %s);
                ACTION_METADATA[%s[ %s]] = ACTION_METADATA[ACTIONS[ %s]];
            ]==]):format(
                \%class_identifier, repr(stub), table.concat(args, ", "),
                    body_lua,
                repr(names), repr(\%line:get_line_no()), table.concat(args, ", "),
                    repr(repr(stub)), table.concat(arg_nomsus, ".."),
                repr(nomsu:dedent(\%line.src)),
                \%class_identifier, repr(stub), repr(stub)));

    return ".."
        do -- \%class_identifier
            -- Create the class object:
            local \%class_identifier = setmetatable({
                name=\(%classname as lua), instances=setmetatable({}, {__mode="k"}),
            }, {
                __tostring=function(c) return c.name; end,
                __call=function(cls, inst)
                    inst = inst or {};
                    inst.id = tostring(inst):match('table: (.*)');
                    setmetatable(inst, cls.instance_metatable);
                    cls.instances[inst] = true;
                    if inst['set % up'] then
                        inst['set % up'](inst);
                    end
                    return inst;
                end,
            });
            \%class_identifier.class = \%class_identifier;

            -- Define the methods:
        \(join %methods with "\n")

            -- Define class methods for instantiating and accessing instances:
            \%class_identifier.instance_metatable = {
                __index=\%class_identifier,
                __tostring=\%class_identifier['% as text'] or function(inst)
                    return "<"..inst.class.name..": "..inst.id..">";
                end,
            };
            nomsu:define_action("instances of "..\%class_identifier.name, "lib/class.nom", function()
                return utils.keys(\%class_identifier.instances);
            end, "");
            nomsu:define_action("new "..\%class_identifier.name.." %instance", "lib/class.nom", function(_instance)
                return \%class_identifier(_instance);
            end, "");
            nomsu:define_action("new "..\%class_identifier.name, "lib/class.nom", function()
                return \%class_identifier({});
            end, "");
        end -- End of definition of \%class_identifier
        \("\n\n")