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module Tplt # Template
class << self
def base(gem_name, init_body, final_body)
%{
void
mrb_mruby_#{gem_name}_gem_init(mrb_state* mrb) {
#{init_body}
}
void
mrb_mruby_#{gem_name}_gem_final(mrb_state* mrb) {
#{final_body}
}
}
end
def non_struct_types
@non_struct_types ||= ['bool', 'int', 'float', 'double', 'float', 'const char *', 'unsigned int', 'void']
end
def init_module(module_name)
"struct RClass *#{module_name.downcase}_module = mrb_define_module(mrb, \"#{module_name}\");"
end
def init_module_function(module_name, function_name, mrb_function_name, mrb_args)
%{
mrb_define_module_function(mrb, #{module_name}, "#{function_name}", mrb_#{mrb_function_name}, #{mrb_args});
}
end
# define under needs the C name, not the ruby name which may be confusing
def init_class(class_name, define_under, is_struct_wrapper = true)
%{
struct RClass *#{class_name.downcase}_class = mrb_define_class_under(mrb, #{define_under}, \"#{class_name}\", mrb->object_class);"#{
if is_struct_wrapper
"\nMRB_SET_INSTANCE_TT(#{class_name.downcase}_class, MRB_TT_DATA);"
end
}
}
end
def function(function_name, body)
%{
static mrb_value
mrb_#{function_name}(mrb_state* mrb, mrb_value self) {
#{body}
}
}
end
def init_function(class_name, function_name, mrb_function_name, mrb_args)
%{mrb_define_method(mrb, #{class_name}, "#{function_name}", mrb_#{mrb_function_name}, #{mrb_args});
}
end
def get_kwargs(kwarg_num, init_var_body, init_array_body)
%{
#{init_var_body}
uint32_t kw_num = #{kwarg_num};
const mrb_sym kw_names[] = {
#{init_array_body}
};
mrb_value kw_values[kw_num];
const mrb_kwargs kwargs = { kw_num, 0, kw_names, kw_values, NULL };
mrb_get_args(mrb, "|:", &kwargs);
}
end
def unwrap_kwarg(kwarg_iter, body_if_defined, body_if_undefined = nil, no_argument_error_message = 'Missing Keyword Argument')
%{
if (mrb_undef_p(kw_values[#{kwarg_iter}])) {
#{body_if_undefined || "mrb_load_string(mrb, \"raise ArgumentError.new \\\"#{no_argument_error_message}\\\"\");"}
} else {
#{body_if_defined}
}
}
end
def unwrap_struct(var_name, target, mrb_type, type)
%{#{var_name} = DATA_GET_PTR(mrb, #{target}, &#{mrb_type}, #{type})}
end
def wrap_struct(var_name, target, mrb_type, type)
%{
#{var_name} = (#{type} *)DATA_PTR(#{target})
if(#{var_name}) #{'{'} mrb_free(mrb, #{var_name}); #{'}'}
mrb_data_init(#{target}, NULL, &#{mrb_type});
#{var_name} = (#{type} *)mrb_malloc(mrb, sizeof(#{type}));
}
end
def define_module(module_name)
%{struct RClass *#{module_name.downcase} = mrb_define_module(mrb, "#{module_name}");
}
end
# for converting mrb to C
def to_c(type, variable)
if (type == 'int') || (type == 'unsigned int') || (type == 'bool')
"mrb_as_int(mrb, #{variable})"
elsif (type == 'float') || (type == 'double')
"mrb_as_float(mrb, #{variable})"
elsif (type == 'const char *') || (type == 'char *')
"mrb_str_to_cstr(mrb, #{variable})"
end
end
# for converting C to mrb
def to_mrb(type, variable)
if (type == 'int') || (type == 'unsigned int')
"mrb_fixnum_value(#{variable})"
elsif (type == 'float') || (type == 'double')
"mrb_float_value(mrb, #{variable})"
elsif type == 'bool'
"mrb_bool_value(#{variable})"
elsif (type == 'const char *') || (type == 'char *')
"mrb_str_new_cstr(mrb, #{variable})"
elsif type == 'NULL'
'mrb_nil_value()'
end
end
# convert a C function name to be
# formatted like a Ruby method name
def rubify_func_name(function)
func = function.underscore
if func.start_with? 'is_'
func = func.delete_prefix('is_') + '?'
end
func.delete_prefix('get_')
end
# generate a return of a ruby bound C function
def return_format(function, params)
func_rpart = function.rpartition(' ')
func_datatype = func_rpart.first
func_name = func_rpart.last
result = ''
if func_datatype == 'void'
if params.first == 'void'
result = "#{func_name}();\nreturn mrb_nil_value();"
else
result = "#{func_name}("
result += params.first.rpartition(' ').last
params.drop(1).each do |param|
result += ", #{param.rpartition(' ').last}"
end
result += ");\nreturn mrb_nil_value();"
end
elsif params.first == 'void'
result = "return " + Tplt.to_mrb(func_datatype, "#{func_name}()") + ';'
else
temp_params = params.first.rpartition(' ').last
params.drop(1).each do |param|
temp_params += ", #{param.rpartition(' ').last}"
end
result = 'return ' + Tplt.to_mrb(func_datatype, "#{func_name}(#{temp_params})") + ';'
end
result
end
# wrapping an existing struct to be used by ruby
def init_struct_wrapper(struct, free_body = nil)
%{
#{"void mrb_helper_#{struct}_free(mrb_state*, void*);" if free_body}
static const struct mrb_data_type mrb_#{struct}_struct = {
"#{struct}",
#{
if free_body
"mrb_helper_#{struct}_free"
else
"mrb_free"
end
}
};
#{
if free_body
%{
void
mrb_helper_#{struct}_free(mrb_state* mrb, void*ptr) {
#{struct} *struct_data = (#{struct}*)ptr;
#{free_body}
mrb_free(mrb, ptr);
}
}
end
}
}
end
end
end
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