HaxePunk/HaxePunk

package haxepunk.assets;

class AssetMacros
{
    macro public static function findAsset(cache:haxe.macro.Expr, map:haxe.macro.Expr, other:haxe.macro.Expr, id:haxe.macro.Expr, addRef:haxe.macro.Expr, fallback:haxe.macro.Expr, ?onRef:haxe.macro.Expr)
    {
        if (onRef == null) onRef = macro {};
        return macro {
            var result = null;
            // if we already have this asset cached, return it
            if (${map}.exists(${id}))
            {
                result = ${map}[${id}];
            }
            else
            {
                // if another active cache already has this texture cached, return
                // their version
                for (otherCache in active)
                {
                    if (${other}.exists(${id}))
                    {
                        var cached = $other[${id}];
                        if (${addRef} && cached != null)
                        {
                            // keep this asset cached here too, in case the owning cache is
                            // disposed before this one is
                            Log.debug('adding asset cache reference: ' + ${cache} + ':' + ${id} + ' -> ' + otherCache.name + ':' + ${id});
                            ${map}[${id}] = cached;
                            ${onRef};
                        }
                        result = cached;
                    }
                }
                // no cached version; load from asset loader
                if (result == null) result = ${map}[${id}] = ${fallback};
            }
            result;
        }
    }
}