状態

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LSLでは, ほとんどのスクリプトは何らかの入力を受け取るか、環境における何らかの変化を検出するまで何もしていない. どの瞬間も, スクリプトは何らかの状態(state)にあり, プログラマーによって定義された仕組みにしたがってイベントや入力に反応しようとする. しかし, スクリプトは二つ以上の状態をもつことができ, どの状態にいるかにより, イベントや入力に対して異なった反応をする.

主たる状態はdefault状態である. When a script is compiled, reset or loaded, this is the state it enters by default. After the default state definition can follow additional state definitions which the script may use to change how and which events are handled.

default { events }

default { events }

• event

events

–

one or more events

The default state definition.

state target { events }

• label	target	–	state name
• event	events	–	one or more events

target state definition.

|- |

state target;

• label

target

–

name of a state to run

When a state target; is encountered at runtime, if the current state and the target state are different:

1. Trigger state_exit in the current state if it exists and clear the event queue.
2. Change state to target, any listens are unregistered.
3. Trigger state_entry in the target state if it exists.

If target state is the same as the current state, no state change occurs nor do any of the side effects.

Caveats

• On state change:
  • All listens are released.
  • The event queue is cleared
• The default state must be defined before all others.
• States cannot have user functions or variables inside their immediate scope, only event definitions may be inside a states scope.

Examples

default
{
    touch_start(integer a)
    {
        state hello;
    }
}

state hello
{
    state_entry()
    {
        llOwnerSay("Hello");
        state default;
    }
    state_exit()
    {
        llOwnerSay("Goodbye");
    }
}

See Also

Keywords

•	jump
•	return

Events

•	state_entry
•	state_exit