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 by_arg_count.is_virtual:
params.append('lua_self')
case.body.append(cpp.cpp_return(cpp.cpp_method_call('lua_munch_' + 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.parent:
method.parent = orig_method.parent.translation
method.orig_name = orig_method.name
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)))
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 = copy(orig_method.translation)
lua_method.parameters = orig_method.translation.parameters[:-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):
method = function.translation
#will hold the real variables the method uses, after initialization
method.transformed_parameters = []
#adding an index value to each positional parameter
#firstly we add the default initializers for each mapped type
for i, parameter in enumerate(function.parameters):
overriden_variable = lua_context_builder.apply_variable_initialization(parameter, context)
overriden_variable.index = parameter.index = i if function.is_constructor else i + 2
method.transformed_parameters.append(overriden_variable)
method.initialization.append(overriden_variable)
#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 method.transformed_parameters:
method.validation.append(lua_context_builder.apply_variable_check(parameter, context))
#then we get the variables from LUA
if function.parent and not function.is_constructor:
if function.is_virtual:
cif = cpp.cpp_if(['lua_self != nullptr'])
cif.body.append('lua_self = static_cast<{}*>(lua_touserdata(L, 1))'.format(function.parent.qualname))
method.recover.append(cif)
else:
method.initialization.append('{0}* lua_self = static_cast<{1}*>(lua_touserdata(L, 1))'.format(function.parent.qualname, function.parent.qualname))
for parameter in method.transformed_parameters:
method.recover.append(lua_context_builder.apply_variable_conversion_from_target(parameter, context))
applied_parameters = []
#then we add type casting to the original variable type
for tp, fp in zip(method.transformed_parameters, function.parameters):
applied_parameters.append(tp.cast(cpp.cpp_static_cast, fp.ctype))
if function.is_constructor:
method.execution.append('{0}* lua_self = new {0}({1})'.format(function.parent.qualname,
','.join(map(str,applied_parameters))))
method.execution.append('lua_pushlightuserdata(L, (void*) lua_self)')
method.return_value = cpp.cpp_return(1)
else:
#then we call the original method!
fname = function.name if not function.is_overload else function.orig_name
method.execution.append(cpp.cpp_method_call(fname if not function.parent else 'lua_self->' + fname, applied_parameters))
if function.returns != cpp.cpp_type('void'):
logging.debug('lua_return: translating variable %r to LUA', function.returns)
#if the function is not void, we recover the method execution
method_execution = method.execution[0]
del method.execution[:]
return_var = cpp.cpp_variable('lua_return', function.returns)
#create a variable assignment
method.execution.append(return_var.declare(return_var.assign(method_execution)))
#push the value to lua
method.lua_return.append(lua_context_builder.apply_variable_conversion_to_target(return_var, context))
print 'lua return is', method.lua_return
#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
logging.debug("finished translating: %r", method)
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)
orig_class.translation = lua_cls
luaReg = cpp.cpp_variable_array('lua_reg_' + orig_class.identifier_name,
cpp.cpp_type('constexpr luaL_Reg', static=True))
logging.debug('baking methods for class: %s : %s' % (orig_class.name ,orig_class.public))
#lua_cls.public.append(make_getter(orig_class))
#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 item.public:
luaReg.expr.append('{ "%s" , lua_munch_%s::%s }' % (item.orig_name, orig_class.identifier_name, item.name))
lua_cls.public.append(make_binder(orig_class, lua_cls))
#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, %d)' % (orig_class.qualname, orig_class.identifier_name, 1))
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)
context.binder_method.exprs.append('{}::bind(L)'.format(lua_cls.name))
luaReg.parent = lua_cls
vardecl = luaReg.define()
vardecl = vardecl.replace('static', '')
context.luareg_declarations.append(vardecl)
orig_class.translation = lua_cls
def lua_preprocess(data, context):
classes = filter(lambda item: type(item) == cpp.cpp_class, data)
functions = filter(lambda item: type(item) == cpp.cpp_method and item.parent == None, data)
other = filter(lambda item: type(item) != cpp.cpp_method and type(item) != cpp.cpp_class, data)
del data[:]
#resolving overloads
for item in classes:
item.identifier_name = item.qualname\
.replace('::', '_')\
.replace(' ', '')\
.replace('<','_')\
.replace('>', '_')\
.replace(',', '_')
process_functions(item)
#resolving dependencies
sorted_classes = []
class_set = set([])
previous_count = len(classes)
iteration = 0
while classes:
current = classes.pop(0)
processed = True
#print 'testing', current.name, current.dependencies
for dependency in current.dependencies:
if 'std' in dependency or dependency == current.qualname:
continue
#remove this once the generator knows how to get template items
if '<' in dependency:
templates = dependency[dependency.find('<') + 1:dependency.find('>')].split(',')
current.dependencies += templates
if not dependency in class_set and not iteration == 10:
#print 'I dont have dependency: ', dependency
classes.append(current)
processed = False
break
if processed:
#print '### added', current.name
sorted_classes.append(current)
class_set.add(current.qualname)
iteration = 0
if previous_count == len(classes):
if iteration == 10:
raise Exception("Couldn't resolve dependencies for the classes:" + str(classes))
iteration += 1
previous_count = len(classes)
fake_cls = cpp.cpp_class('Fake')
fake_cls.public = functions
process_functions(fake_cls)
data += sorted_classes + fake_cls.public + other
context.binder_method = cpp.cpp_method('luaopen_gdx',
returns=cpp.cpp_type('int'),
attributes=['extern', '"C"'],
params=[cpp.cpp_variable('L', cpp.cpp_type('lua_State', pointer=True))])
context.luareg_declarations = []
context.binder_method.exprs.append('lua_newtable(L)')
context.binder_method.return_value = cpp.cpp_return(1)