def process_overload_by_arg_count(orig_method, context): logging.debug('processing a overload by arg count: %s' + orig_method.name) acount = orig_method.overloads['by_arg_count'] switch = cpp.cpp_switch('lua_gettop(L)') for by_arg_count in acount: case = cpp.cpp_case() case.expr = len(by_arg_count.parameters) params = ['L'] if orig_method.is_virtual: params += 'lua_self' case.body.append(cpp.cpp_return(cpp.cpp_method_call(by_arg_count.name, params=params))) switch.exprs.append(case) #we bake the overload method and add it back to our context other_method = lua_context_builder.bake([by_arg_count], preprocess = False).translated[0] other_method.public = False context.translated.append(other_method) for item in other_method.execution: if type(item) == cpp.cpp_method_call: item.expr = orig_method.name if not orig_method.parent else 'lua_self->' + orig_method.name break orig_method.translation.execution.append(switch)
def init_translated_method(orig_method, context): assert 'translation' not in orig_method.__dict__ logging.debug('entered [init_translated_method] with method:' + repr(orig_method)) method = cpp.cpp_method('lua_munch_' + orig_method.name, static=True, returns= cpp.cpp_type('int'), params=[cpp.cpp_variable('L', cpp.cpp_type('lua_State', pointer=True))]) if orig_method.is_virtual: method.parameters.append(cpp.cpp_type(orig_method.parent.qualname, pointer= True)) method.public = True #now we embed the default object with a very specific format that will be useful later method.initialization = [] # will contain initialization steps method.validation = [] # will contain validation steps method.recover = [] # will contain the steps to translate the lua arg to a C++ arg method.execution = [] # will contain execution steps, i.e, calling the native method method.lua_return = [] # will contain the steps to push a value back to lua if not 'is_overload' in method.__dict__: method.is_overload = False if orig_method.parent and orig_method.is_virtual: method.parameters.append(cpp.cpp_variable('lua_self', cpp.cpp_type(orig_method.parent.qualname, pointer=True))) if orig_method.is_constructor: method.name = 'lua_munch_' + orig_method.parent.name + '_constructor' method.return_value = cpp.cpp_return(0) #we 'tie' the translated method on the original method #so it's easier to work with them without needing to search for them on every callback orig_method.translation = method
def process_virtual_function_callback(orig_method, context): lua_method = deepcopy(orig_method.translation) lua_method.parameters.pop(-1) lua_method.exprs = [] lua_method.return_value = cpp.cpp_return(cpp.cpp_method_call(lua_method.name, params=['L', 'nullptr'])) orig_method.translation.parent.public.append(lua_method)
def process_function(function, context): logging.debug('translating:' + repr(function)) method = function.translation #adding an index value to each positional parameter for i, parameter in enumerate(function.parameters): parameter.index = i if function.is_constructor else i + 2 #firstly we add the default initializers for each mapped type for parameter in function.parameters: method.initialization.append(lua_context_builder.apply_variable_initialization(parameter, context)) #this additional step will ensure that the amount of parameters is correct method.validation.append('assert(lua_gettop(L) == %d)' % (len(function.parameters) + (0 if function.is_constructor else 1))) #then we add type checking for parameter in function.parameters: method.validation.append(lua_context_builder.apply_variable_check(parameter, context)) #then we get the variables from LUA if function.parent: if function.is_virtual: cif = cpp.cpp_if(['lua_self != nullptr']) cif.body.append('lua_self = lua_munch_%s::get(L)' % (function.parent.identifier_name)) method.recover.append(cif) else: method.initialization.append('{0}* lua_self = lua_munch_{1}::get(L)'.format(function.parent.qualname, function.parent.identifier_name)) for parameter in function.parameters: method.recover.append(lua_context_builder.apply_variable_conversion_from_target(parameter, context)) applied_parameters = [] for parameter in function.parameters: applied_parameters.append(cpp.cpp_dereference(parameter)) #then we call the original method! method.execution.append(cpp.cpp_method_call(function.name if not function.parent else 'lua_self->' + function.name, applied_parameters)) if function.returns != cpp.cpp_type('void'): #if the function is not void, we recover the method execution method_execution = method.execution[0] #create a variable assignment assign = cpp.cpp_assignment(cpp.cpp_variable('lua_return', function.returns), method_execution) #put id back to the execution method.execution[0] = assign #push the value to lua method.lua_return.append(lua_context_builder.apply_variable_conversion_to_target(assign.expr_a, context)) #and then change the call function to 1 so LUA knows it has one value to unpack method.return_value = cpp.cpp_return(1) method.exprs += method.initialization + method.validation + method.recover + method.execution + method.lua_return
def process_overload_by_lua_type(orig_method, context): logging.debug('processing overloads by lua type for method: %s' % orig_method.name) aluatype = orig_method.overloads['by_lua_type'] cif = None tmp = None stack_init = 1 if not orig_method.is_constructor else 0 for by_lua_type in aluatype: cand = cpp.cpp_and() for i, param in enumerate(by_lua_type.parameters): lua_type = get_lua_tye(param.ctype) cand.exprs.append('lua_type(L, %d) == %s' % (stack_init + i, lua_type)) if not cand.exprs: raise Exception("Error processing items by lua type: %r" % (by_lua_type)) by_lua_type.is_overload = False #we bake the overload method and add it back to our context other_method = lua_context_builder.bake([by_lua_type], preprocess = False).translated[0] other_method.public = False context.translated.append(other_method) for item in other_method.execution: if type(item) == cpp.cpp_method_call: item.expr = orig_method.name if not orig_method.parent else 'lua_self->' + orig_method.name break if not tmp: cif = tmp = cpp.cpp_if() else: tmp.cpp_else = cpp.cpp_if() tmp = cif.cpp_else tmp.exprs.append(cand) params = ['L'] if orig_method.is_virtual: params.append('lua_self') ret = cpp.cpp_return(cpp.cpp_method_call('lua_munch_' + by_lua_type.name, params = params)) tmp.body.append(ret) orig_method.translation.execution.append(cif)
def init_translated_class(orig_class, context): assert 'translation' not in orig_class.__dict__ lua_cls = cpp.cpp_class('lua_munch_' + orig_class.identifier_name) luaReg = cpp.cpp_variable_array('lua_reg_' + orig_class.identifier_name, cpp.cpp_type('luaL_Reg', static=True)) logging.debug('baking methods for class: %s : %s' % (orig_class.name ,orig_class.public)) #we now bake all methods and subclasses from this class, but not preprocess them class_ctx = lua_context_builder.bake(orig_class.public, preprocess=False) for item in class_ctx.translated: if item.public: lua_cls.public.append(item) else: lua_cls.protected.append(item) if type(item) == cpp.cpp_method and not item.is_constructor and item.public: luaReg.expr.append('{ "%s" , lua_munch_%s::lua_munch_%s }' % (item.name, orig_class.name, item.name)) #the base methods are shims that only retrieve it's self and pass it down to the #base class for base in orig_class.bases: for item in base.public: if type(item) != cpp.cpp_method: continue method = cpp.cpp_method('lua_munch_' + item.name, static=True, returns=cpp.cpp_type('int'), params=[cpp.cpp_variable('L', cpp.cpp_type('lua_State', pointer=True))]) if item.parent: item.parameters.append(cpp.cpp_variable('lua_self', cpp.cpp_type(item.parent.name, pointer=True))) method.exprs.append('%s* lua_self = lua_munch_%s::get(L)' % (orig_class.qualname, orig_class.identifier_name)) method.exprs.append(cpp.cpp_return(cpp.cpp_method_call('lua_munch_%s::lua_munch_%s' % (item.parent.name, item.name), params=['L', 'lua_self']))) lua_cls.public.append(method) if not item.is_constructor: luaReg.expr.append('{ "%s" , lua_munch_%s::lua_munch_%s }' % (item.name, orig_class.name, item.name)) luaReg.expr.append('{ 0, 0 }') lua_cls.public.append(luaReg) orig_class.translation = lua_cls