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/// Some default stacks.
.entity verbs_idle;
.entity verbs_attack;
.entity verbs_move;
/// This global gets set to the verb in question each time the stack manager calls verb_call
entity verb;
/// Execure this verb
#define VCM_DO 0
/// Return the value of this verb. Return VS_CALL_REMOVE to delete it.
#define VCM_EVAL 1
/// This verb is beeing removed NOW (not sent when verb_call returns VS_CALL_REMOVE)
#define VCM_REMOVE 2
/// Verb callback
.float(float message) verb_call;
/// Points to this verb's stack.
.entity verbstack;
/// Static value of this verb
.float verb_static_value;
/// verb_call returns this when a verb in not doable
#define VS_CALL_NO 0
/// verb_call(VCM_DO) returns this when a verb is executing
#define VS_CALL_YES_DOING -1
/// verb_call(VCM_DO) returns this when a verb did execure and is done
#define VS_CALL_YES_DONE -2
/// verb_call(VCM_DO) returns this when a verb should be deleted by the stack manager
#define VS_CALL_REMOVE -3
/**
Push a new verb onto the specified stack. Set vrb_life to make it time-limited.
**/
entity verbstack_push(entity stack, float(float eval) vrb_call, float val_static, float vrb_life,entity verb_owner)
{
entity vrb;
if not(stack)
return world;
if not(vrb_call)
return world;
vrb = spawn();
vrb.owner = verb_owner;
vrb.verbstack = stack;
vrb.verb_call = vrb_call;
vrb.verb_static_value = val_static;
if(vrb_life)
{
vrb.think = SUB_Remove;
vrb.nextthink = time + vrb_life;
}
return vrb;
}
/**
Find the best verb in this stack and execurte it.
ALso remove any verbs returning VS_CALL_REMOVE on VCM_EVAL or VCM_DO
**/
float verbstack_pop(entity stack)
{
entity vrb, bestverb, oldself;
float value, bestvalue;
oldself = self;
vrb = findchainentity(verbstack,stack);
while(vrb)
{
verb = vrb;
vrb = vrb.chain;
self = verb.owner;
value = verb.verb_call(VCM_EVAL);
if(value < 0)
{
if(value == VS_CALL_REMOVE)
remove(verb);
}
else
{
if(value > bestvalue)
{
bestverb = verb;
bestvalue = value;
}
}
}
if(bestverb)
{
verb = bestverb;
self = verb.owner;
value = verb.verb_call(VCM_DO);
if(value == VS_CALL_REMOVE)
remove(bestverb);
}
self = oldself;
return value;
}
float verbstack_popfifo(entity stack)
{
entity oldself;
float ret;
oldself = self;
verb = findentity(stack,verbstack,stack);
if not (verb)
ret = 0;
else
{
self = verb.owner;
ret = verb.verb_call(VCM_DO);
if(ret == VS_CALL_REMOVE)
remove(verb);
}
self = oldself;
return ret;
}
/**
Find the best verb in this stack and return it.
ALso remove any verbs returning VS_CALL_REMOVE on VCM_EVAL.
**/
entity verbstack_pull(entity stack)
{
entity vrb;
entity bestverb, oldself;
float value, bestvalue;
oldself = self;
vrb = findchainentity(verbstack,stack);
while(vrb)
{
self = vrb.owner;
verb = vrb;
vrb = vrb.chain;
value = verb.verb_call(VCM_EVAL);
if(value > 0)
{
if(value == VS_CALL_REMOVE)
remove(verb);
}
else
{
if(value > bestvalue)
{
bestverb = verb;
bestvalue = value;
}
}
}
self = oldself;
return bestverb;
}
entity verbstack_pullfifo(entity stack)
{
return findentity(stack,verbstack,stack);
}
/**
Delete every verb on this stack, signaling them with VCM_REMOVE first.
**/
void verbstack_flush(entity stack)
{
entity vrb, oldself;
oldself = self;
vrb = findchainentity(verbstack,stack);
while(vrb)
{
self = vrb.owner;
verb = vrb;
vrb = vrb.chain;
verb.verb_call(VCM_REMOVE);
remove(verb);
}
self = oldself;
}
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