LSL-- Flow Control
Flow Control
流控制
1. Subcategories
1.1 LSL Conditional
条件的。
1.2 LSL Functions
1.3 LSL Operators
1.4 LSL User-Defined Functions
用户定义的函数
2. Pages
2.1 D
2.1.1 Default
state target { events }
• label target – state name
• event events – one or more events
target state definition.
2.1.1.1 在脚本内不能直接包含用户定义的函数或变量；只有事件可以定义在state范围内
2.1.1.2 default 状态定义应其他状态之前
2.1.1.3 状态不能在用户定义的全局函数中转换；如果使用IF，不能使用ELSE
2.1.1.4 状态转换
default
{
touch_end(integer a)
{
state hello;
}
}
state hello
{
state_entry()
{
llOwnerSay("Hello");
state default;
}
state_exit()
{
llOwnerSay("Goodbye");
}
}
2.1.1.4.1 所有的listen事件released
2.1.1.4.2 所有的事件队列清除
2.1.1.4.3 timer event clock没有清除
2.1.1.5 现在状态和目标状态的关系
2.1.1.5.1 state_exit()在现在状态退出时触发
2.1.1.5.2 状态转为trigger，所有的listen未注册
2.1.1.5.3 触发state_entry()事件，如果在目标状态
2.1.2 Do while
do loop while (condition);
• loop – Executes once, then executes condition.
• condition – If condition executes true, it then loops back and executes loop again.
2.2 E
2.2.1 Else
if ( condition ) branch_true else branch_false
• condition – If this executes as true then branch_true is executed otherwise branch_false is executed.
• branch_true – Can be either a single statement, a block statement, or a null statement.
• branch_false – Can be either a single statement, a block statement, or a null statement.
2.3 F
2.3.1 For
for( initializer; condition; increment ) loop
• initializer – Executed once just before checking condition.
• condition – If this executes as true then loop is executed.
• increment – Executed after loop, then condition is checked again.
• loop – Can be either a single statement, a block statement, or a null statement.
2.3.1.1 等效的while
A for loop is the same as a while loop as below.
initializer;
while(condition)
{
loop;
increment;
}
2.4 I
2.4.1 If
2.4.1.1 short circuit
// A simple method to say if the method was called.
integer test()
{
llOwnerSay("Test method called!");
return TRUE;
}
default
{
touch_start(integer total_number)
{
if (FALSE && test())
{ // If short-circuit optimized then the test() should never be called.
// Will never get here.
}
}
}
2.4.1.2 复杂的IF/ELSE语句
Complex if/else block (only one line of text will be said by this example)
if (a == "Loren") {
llSay(0, "Lorem ipsum sic amet!");
} else if (a == "Bob") {
llSay(0, "Babble dabble rabble rouse.");
} else {
llSay(0, "Gobbledygook? or English?");
}
2.4.1.3 条件的判断在前，将引起不能编译
在大量的代码中这将是非常错误的。
2.5 J
2.5.1 Jump
2.6 L
2.6.1 LSL Addition
2.6.1.1 Integer
2.6.1.2 Vector
2.6.1.3 Rotation
2.6.1.4 String
2.6.1.5 List
列表和列表相加：
List1+List2：将List2加到List1的末尾。List2自动转换为List
2.7 R
2.7.1 Return
return value;
• type value – value or variable to be returned by the function, the type must be the same as that to be returned by the function.
Used to return execution to the previous scope along with a value.
Functions
Exits the function and continues script execution in the previous scope.
Events
Causes the script to crash. Events cannot return a value. Use the next form of this keyword instead.
2.7.1.1 return value
返回值；对应函数，退出函数，继续执行脚本
对应事件，事件不能返回值，故会产生冲突。
Used to prematurely return execution to the previous scope before reaching the end of the function/event. You do not need to use this at the end of an event or function, as it is assumed by the compiler.
Functions
Exits the function and continues script execution in the previous scope.
Events
Exits the event and removes it from the event queue. If there is another event in the queue, that event is triggered.
2.7.1.2 return
无返回值；函数：同上。
事件：退出事件，且将事件从队列提出。如果队列中有另一个事件，则该事件触发。
Used to prematurely return execution to the previous scope before reaching the end of the function/event. You do not need to use this at the end of an event or function, as it is assumed by the compiler.
Functions
Exits the function and continues script execution in the previous scope.
Events
Exits the event and removes it from the event queue. If there is another event in the queue, that event is triggered.
2.8 S
2.8.1 State
2.9 W
2.9.1 While