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#include "common.h"
/* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */
honey_result honey_format_string(char** string,
char* format_string,
...)
{
honey_result res;
va_list args, args_;
va_start(args, format_string);
va_copy(args_, args);
int string_size = vsnprintf(NULL, 0, format_string, args_);
va_end(args_);
*string = malloc((string_size+1) * sizeof(char));
if (*string == NULL)
res = HONEY_MEMORY_ALLOCATION_ERROR;
else {
vsnprintf(*string, string_size+1, format_string, args);
res = HONEY_OK;
}
va_end(args);
return res;
}
/* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */
bool honey_lua_validate_types(lua_State* L,
unsigned int n_types,
...)
{
va_list args;
va_start(args, n_types);
for (int i=0; i<n_types; i++) {
honey_lua_type expected_type = va_arg(args, honey_lua_type);
honey_result result;
char* error_message;
switch(expected_type) {
case HONEY_BOOL:
if (!lua_isboolean(L, i+1)) {
result = honey_format_string(&error_message,
"Expected boolean in position %d",
i);
if (result != HONEY_OK)
lua_pushstring(L, "Expected boolean; allocation error occurred for more detailed message.");
else {
lua_pushstring(L, error_message);
free(error_message);
}
return false;
}
break;
case HONEY_INT:
case HONEY_NUM:
if (!lua_isnumber(L, i+1)) {
result = honey_format_string(&error_message,
"Expected number in position %d",
i);
if (result != HONEY_OK)
lua_pushstring(L, "Expected number; allocation error occurred for more detailed message.");
else {
lua_pushstring(L, error_message);
free(error_message);
}
return false;
}
break;
case HONEY_STRING:
if (!lua_isstring(L, i+1)) {
result = honey_format_string(&error_message,
"Expected string in position %d",
i);
if (result != HONEY_OK)
lua_pushstring(L, "Expected string; allocation error occurred for more detailed message.");
else {
lua_pushstring(L, error_message);
free(error_message);
}
return false;
}
break;
case HONEY_FUNC:
if (!lua_isfunction(L, i+1)) {
result = honey_format_string(&error_message,
"Expected function in position %d",
i);
if (result != HONEY_OK)
lua_pushstring(L, "Expected function; allocation error occurred for more detailed message.");
else {
lua_pushstring(L, error_message);
free(error_message);
}
return false;
}
break;
case HONEY_TABLE:
if (!lua_istable(L, i+1)) {
result = honey_format_string(&error_message,
"Expected table in position %d",
i);
if (result != HONEY_OK)
lua_pushstring(L, "Expected table; allocation error occurred for more detailed message.");
else {
lua_pushstring(L, error_message);
free(error_message);
}
return false;
}
break;
case HONEY_NIL:
if (!lua_isnil(L, i+1)) {
result = honey_format_string(&error_message,
"Expected nil in position %d",
i);
if (result != HONEY_OK)
lua_pushstring(L, "Expected nil; allocation error occurred for more detailed message.");
else {
lua_pushstring(L, error_message);
free(error_message);
}
return false;
}
break;
case HONEY_USERDATA:
if (!lua_isuserdata(L, i+1)) {
result = honey_format_string(&error_message,
"Expected userdata in position %d",
i);
if (result != HONEY_OK)
lua_pushstring(L, "Expected userdata; allocation error occurred for more detailed message.");
else {
lua_pushstring(L, error_message);
free(error_message);
}
return false;
}
break;
case HONEY_LIGHTUSERDATA:
if (!lua_islightuserdata(L, i+1)) {
result = honey_format_string(&error_message,
"Expected C pointer in position %d",
i);
if (result != HONEY_OK)
lua_pushstring(L, "Expected C pointer; allocation error occurred for more detailed message.");
else {
lua_pushstring(L, error_message);
free(error_message);
}
return false;
}
break;
case HONEY_ANY:
break;
default:
break;
}
}
va_end(args);
return true;
}
/* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */
void honey_lua_create_table(lua_State* L,
honey_lua_element* elements,
unsigned int n_elements)
{
lua_createtable(L, 0, n_elements);
for (int i=0; i<n_elements; i++) {
honey_lua_push_element(L, elements[i]);
lua_setfield(L, -2, elements[i].name);
}
}
/* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */
void honey_lua_push_element(lua_State* L, honey_lua_element element)
{
switch(element.type) {
case HONEY_INT:
lua_pushinteger(L, element.data.integer);
break;
case HONEY_NUM:
lua_pushnumber(L, element.data.number);
break;
case HONEY_STRING:
lua_pushstring(L, element.data.string);
break;
case HONEY_FUNC:
lua_pushcfunction(L, element.data.function);
break;
case HONEY_TABLE:
honey_lua_create_table(L,
element.data.table.elements,
element.data.table.n_elements);
break;
case HONEY_NIL:
lua_pushnil(L);
break;
case HONEY_USERDATA:
/* cannot push userdata, push nil */
lua_pushnil(L);
break;
case HONEY_LIGHTUSERDATA:
lua_pushlightuserdata(L, element.data.pointer);
break;
default:
// this should never happen
break;
}
}
/* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */
int honey_lua_traceback(lua_State* L)
{
if (!lua_isstring(L, 1))
/* 'message' is not a string, keep intact. */
return 1;
lua_getglobal(L, "debug");
if (!lua_istable(L, -1)) {
lua_pop(L, 1);
return 1;
}
lua_getfield(L, -1, "traceback");
if (!lua_isfunction(L, -1)) {
lua_pop(L, 2);
return 1;
}
lua_pushvalue(L, 1);
lua_pushinteger(L, 2);
lua_call(L, 2, 1);
return 1;
}
/* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */
int honey_lua_pcall(lua_State* L, int nargs, int nret)
{
int traceback_pos = lua_gettop(L) - nargs;
lua_pushcfunction(L, honey_lua_traceback);
lua_insert(L, traceback_pos);
int result = lua_pcall(L, nargs, nret, traceback_pos);
lua_remove(L, traceback_pos);
return result;
}
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