/**
* @brief Execute an action from a source
* @param[in] context Context node
* @param[in] action Action to execute
*/
static void UI_ExecuteAction (const uiAction_t* action, uiCallContext_t *context)
{
switch (action->type) {
case EA_NULL:
/* do nothing */
break;
case EA_CMD:
/* execute a command */
if (action->d.terminal.d1.constString)
Cbuf_AddText(UI_GenInjectedString(action->d.terminal.d1.constString, true, context));
break;
case EA_CALL:
case EA_LISTENER:
UI_ExecuteCallAction(action, context);
break;
case EA_POPVARS:
{
int i;
const int number = action->d.terminal.d1.integer;
assert(number <= context->varNumber);
for (i = 0; i < number; i++) {
const int varId = context->varPosition + context->varNumber - i - 1;
UI_ReleaseVariable(&(ui_global.variableStack[varId]));
}
context->varNumber -= number;
}
break;
case EA_PUSHVARS:
#ifdef DEBUG
/* check sanity */
/** @todo check var slots should be empty */
#endif
context->varNumber += action->d.terminal.d1.integer;
if (context->varNumber >= UI_MAX_VARIABLESTACK)
Com_Error(ERR_FATAL, "UI_ExecuteAction: Variable stack full. UI_MAX_VARIABLESTACK hit.");
break;
case EA_ASSIGN:
UI_ExecuteSetAction(action, context);
break;
case EA_DELETE:
{
const char* cvarname = action->d.nonTerminal.left->d.terminal.d1.constString;
Cvar_Delete(cvarname);
break;
}
case EA_WHILE:
{
int loop = 0;
while (UI_GetBooleanFromExpression(action->d.nonTerminal.left, context)) {
UI_ExecuteActions(action->d.nonTerminal.right, context);
if (loop > 1000) {
Com_Printf("UI_ExecuteAction: Infinite loop. Force breaking 'while'\n");
break;
}
loop++;
}
break;
}
case EA_IF:
if (UI_GetBooleanFromExpression(action->d.nonTerminal.left, context)) {
UI_ExecuteActions(action->d.nonTerminal.right, context);
return;
}
action = action->next;
while (action && action->type == EA_ELIF) {
if (UI_GetBooleanFromExpression(action->d.nonTerminal.left, context)) {
UI_ExecuteActions(action->d.nonTerminal.right, context);
return;
}
action = action->next;
}
if (action && action->type == EA_ELSE) {
UI_ExecuteActions(action->d.nonTerminal.right, context);
}
break;
/** @todo Skipping actions like that is a bad way. the function should return the next action,
* or we should move IF,ELSE,ELIF... in a IF block and not interleave it with default actions
*/
case EA_ELSE:
case EA_ELIF:
/* previous EA_IF execute this action */
break;
default:
Com_Error(ERR_FATAL, "UI_ExecuteAction: Unknown action type %i", action->type);
}
}
/**
* @brief Execute an action from a source
* @param[in] context Context node
* @param[in] action Action to execute
*/
static void UI_ExecuteAction (const uiAction_t* action, uiCallContext_t* context)
{
switch (action->type) {
case EA_NULL:
/* do nothing */
break;
case EA_CMD:
/* execute a command */
if (action->d.terminal.d1.constString)
Cbuf_AddText("%s\n", UI_GenInjectedString(action->d.terminal.d1.constString, true, context));
break;
case EA_CALL:
case EA_LISTENER:
UI_ExecuteCallAction(action, context);
break;
case EA_POPVARS:
{
const int number = action->d.terminal.d1.integer;
assert(number <= context->varNumber);
for (int i = 0; i < number; i++) {
const int varId = context->varPosition + context->varNumber - i - 1;
UI_ReleaseVariable(&(ui_global.variableStack[varId]));
}
context->varNumber -= number;
}
break;
case EA_PUSHVARS:
#ifdef DEBUG
/* check sanity */
/** @todo check var slots should be empty */
#endif
context->varNumber += action->d.terminal.d1.integer;
if (context->varNumber >= UI_MAX_VARIABLESTACK)
Com_Error(ERR_FATAL, "UI_ExecuteAction: Variable stack full. UI_MAX_VARIABLESTACK hit.");
break;
case EA_ASSIGN:
UI_ExecuteSetAction(action, context);
break;
case EA_DELETE:
{
const char* cvarname = action->d.nonTerminal.left->d.terminal.d1.constString;
Cvar_Delete(cvarname);
break;
}
case EA_WHILE:
{
int loop = 0;
while (UI_GetBooleanFromExpression(action->d.nonTerminal.left, context)) {
UI_ExecuteActions(action->d.nonTerminal.right, context);
if (context->breakLoop) {
context->breakLoop = false;
break;
}
if (loop > 1000) {
Com_Printf("UI_ExecuteAction: Infinite loop. Force breaking 'while'\n");
break;
}
loop++;
}
break;
}
/*
expected usage in .ufo scripts:
forchildin ( *node:someNode ) {
...
*node:child <-- reference the child being iterated
...
}
*/
case EA_FORCHILDIN:
{
uiNode_t* root;
root = UI_GetNodeFromExpression(action->d.nonTerminal.left, context, nullptr);
if (!root) {
break;
}
int loop = 0;
for (uiNode_t* node = root->firstChild; node; node = node->next, loop++) {
/* associate the child node with the call context so it can be referenced inside the
script block */
context->tagNode = node;
/* execute the script block inside the forchildin loop */
UI_ExecuteActions(action->d.nonTerminal.right, context);
/* clean the tag node */
context->tagNode = nullptr;
if (context->breakLoop) {
context->breakLoop = false;
break;
}
if (loop > 1000) {
Com_Printf("UI_ExecuteAction: Infinite loop. Force breaking 'forchildin'\n");
break;
}
}
break;
}
case EA_BREAK:
{
/* flag to break, the caller must check this flag before processing the next action in the list */
Com_Printf("BREAK: break statement found\n");
context->breakLoop = true;
break;
}
case EA_IF:
if (UI_GetBooleanFromExpression(action->d.nonTerminal.left, context)) {
UI_ExecuteActions(action->d.nonTerminal.right, context);
return;
}
action = action->next;
while (action && action->type == EA_ELIF) {
if (UI_GetBooleanFromExpression(action->d.nonTerminal.left, context)) {
UI_ExecuteActions(action->d.nonTerminal.right, context);
return;
}
action = action->next;
}
if (action && action->type == EA_ELSE) {
UI_ExecuteActions(action->d.nonTerminal.right, context);
}
break;
/** @todo Skipping actions like that is a bad way. the function should return the next action,
* or we should move IF, ELSE, ELIF... in a IF block and not interleave it with default actions
*/
case EA_ELSE:
case EA_ELIF:
/* previous EA_IF execute this action */
break;
default:
Com_Error(ERR_FATAL, "UI_ExecuteAction: Unknown action type %i", action->type);
}
}
