/**
* Substitute placeholders in a command string. Placeholders consist of two characters,
* the first being a %. Use %% to output a plain % character.
*
* - <code>%i</code>: id member of the event
* - <code>%p</code>: (symbolic events only) local player number
*
* @param command Original command string with the placeholders.
* @param event Event data.
* @param eb Binding data.
* @param out String with placeholders replaced.
*/
static void B_SubstituteInCommand(char const *command, ddevent_t const *event,
evbinding_t *eb, ddstring_t *out)
{
const char* ptr = command;
for(; *ptr; ptr++)
{
if(*ptr == '%')
{
// Escape.
ptr++;
// Must have another character in the placeholder.
if(!*ptr) break;
if(*ptr == 'i')
{
int id = 0;
switch(event->type)
{
case E_TOGGLE:
id = event->toggle.id;
break;
case E_AXIS:
id = event->axis.id;
break;
case E_ANGLE:
id = event->angle.id;
break;
case E_SYMBOLIC:
id = event->symbolic.id;
break;
default:
break;
}
Str_Appendf(out, "%i", id);
}
else if(*ptr == 'p')
{
int id = 0;
if(event->type == E_SYMBOLIC)
{
id = P_ConsoleToLocal(event->symbolic.id);
}
Str_Appendf(out, "%i", id);
}
else if(*ptr == '%')
{
Str_AppendChar(out, *ptr);
}
continue;
}
Str_AppendChar(out, *ptr);
}
}
virtual void invoke(int player, EventSequenceArg* args, int numArgs)
{
if(!strchr(Str_Text(&commandTemplate), '%'))
{
DD_Execute(true/*silent*/, Str_Text(&commandTemplate));
return;
}
// Compose the command from the template, inserting values for named arguments.
/// @todo This logic should be extracted and made into an Str method.
AutoStr* cmd = AutoStr_NewStd();
// Reserve an estimate of the composed command length.
Str_Reserve(cmd, Str_Length(&commandTemplate) + numArgs + 1);
int len = Str_Length(&commandTemplate);
const char* start = Str_Text(&commandTemplate);
const char* ch = start, *substart = start;
while(ch + 1 < start + len)
{
if(ch[0] == '%' && ch[1] && ch[1] != '%')
{
Str_PartAppend(cmd, substart, 0, ch - substart);
if(ch[1] == 'p')
{
Str_AppendChar(cmd, '0' + player);
}
else
{
int arg = ch[1] - '0' - 1;
DENG_ASSERT(arg >= 0 && arg < 9);
Str_AppendChar(cmd, char(args[arg]));
}
ch += 2;
substart = ch;
}
else
{
ch++;
}
}
// Add anything remaining.
Str_Append(cmd, substart);
DD_Execute(true/*silent*/, Str_Text(cmd));
}
