Plugin helper

hoan

Hey guys,

Got running with my first plugin. I found this function which will push an arbritarily complex Objective-C object onto the lua stack.

void wax_fromInstance(lua_State *L, id instance) { //BEGIN_STACK_MODIFY(L)   if (instance) { if ([instance isKindOfClass:[NSString class]]) { lua_pushstring(L, [(NSString *)instance UTF8String]); } else if ([instance isKindOfClass:[NSNumber class]]) { lua_pushnumber(L, [instance doubleValue]); } else if ([instance isKindOfClass:[NSArray class]]) { lua_newtable(L); for (id obj in instance) { int i = lua_objlen(L, -1); wax_fromInstance(L, obj); lua_rawseti(L, -2, i + 1); } } else if ([instance isKindOfClass:[NSDictionary class]]) { lua_newtable(L); for (id key in instance) { wax_fromInstance(L, key); wax_fromInstance(L, [instance objectForKey:key]); lua_rawset(L, -3); } /*} else if ([instance isKindOfClass:[NSValue class]]) { void *buffer = malloc(wax_sizeOfTypeDescription([instance objCType])); [instance getValue:buffer]; wax_fromObjc(L, [instance objCType], buffer); free(buffer); } else if ([instance isKindOfClass:[WaxFunction class]]) { wax_instance_pushUserdata(L, instance); if (lua_isnil(L, -1)) { luaL_error(L, "Could not get userdata associated with WaxFunction"); } lua_getfield(L, -1, "function");*/ } else { //wax_instance_create(L, instance, NO); } } else { lua_pushnil(L); }   // END_STACK_MODIFY(L, 1) }

Use this if you have any data you want converted. Handles, NSString, NSNumber, NSArray, NSDictionary.

wax_fromInstance(L, objcobject);

Hoan

Magnusviri

This makes me wonder if it's possible to have a generic plugin that would allow me to create and call any Objective-C class and method. I'm very familiar with the PerlObj-C bridge in Mac OS X and it bridges a ton of stuff. I believe there are already some lua Objective-C bridges.

alexzheng

This makes me wonder if it's possible to have a generic plugin that would allow me to create and call any Objective-C class and method. I'm very familiar with the PerlObj-C bridge in Mac OS X and it bridges a ton of stuff. I believe there are already some lua Objective-C bridges.

I agree.

atilim

btw, there is a complete C API that allows you create and call any Objective-C class and method: https://developer.apple.com/library/ios/#documentation/Cocoa/Reference/ObjCRuntimeRef/Reference/reference.html

It's possible to wrap these C functions and access all Objective-C runtime capabilities form Lua.

atilim

Also there is a project https://github.com/aptiva/TLC which is a bridge between Lua and Objective C. Although it's using FFI extension from LuaJIT (http://luajit.org/ext_ffi.html), it's totally possible to get the same result with a plugin.

OZApps

@Atilim, are we going to have LuaJIT and TLC in the coming versions? Would be wonderful to have.