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Contents
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| Excerpt |
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Statements provide a convenient method to execute conditional or repetitive operations. The syntax is C/C++/Java like, so things should be easy to grasp. |
If-Else Statement
The if-else statement offers support for conditionally executing operations.
...
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if (isNotNull(fixVersions) and affectedVersions == {"1.1"})
{
affectedVersions = {"1.1", "1.0" , "1.2"};
fixVersions = {"1.2" , "1.2" , "1.3"} ;
}
else
{
affectedVersions = {"1.1"};
fixVersions = {"1.0"};
} |
For Statement
The for statement provides a compact way to iterate over a range of values. Programmers often refer to it as the for loop because it repeatedly loops until a particular condition is satisfied.
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In SIL the for statement has two forms:
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for(<init>; <condition>; <increment>){
Instruction1;
...
InstructionN;
}
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For this first form, the <init> can be an attribution of an already defined variable or a definition for a new variable. |
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| Code Block |
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for(<variable_definition> in #{array}){
Instruction1;
...
InstructionN;
}
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Examples
Example 1 (standard form)
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for(string user in watchers){
print(user);
}
|
While Statement
The while statement offers support for repeated executions. This form evaluates the condition first and then executes the instructions in the body.
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number i = 1;
while(i <= 3) {
multisel = arrayAddElement(multisel,"value" + i);
i = i + 1;
}
|
...
Do-While Statement
The do-while statement is similar to the while statement, except the condition is evaluated after the execution of the encapsulated block. So,even if the condition is false, the instructions will still be evaluated once.
Syntax
The general syntax is:
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do {
Instruction1;
...
InstructionN;
} while(condition);
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The switch statement offers support for executing different operations depending on the value of a variable. The variable can be either a number or a string.
Syntax
The general syntax for this is:
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switch(variable) {
case value1:
Instruction11;
...
Instruction1N;
[break;]
case value2:
Instruction21;
...
Instruction2N;
[break;]
...
case valueN:
InstructionM1;
...
InstructionMN;
[break;]
[default:
InstructionDef1;
...
InstructionDefN;]
} |
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Note: the default branch can be omitted as well as the break statements. |
Example
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switch (season) {
case "Summer":
print("It's too hot!");
break;
case "Winter":
print("It's too cold!");
break;
default:
print("It's just fine!");
} |
...
The break statement can be used in two the following situations:
- inside a loop (for, while): when encountering the break, the execution of the loop is terminated and the control is transfered to transferred to the statement that follows the loop;
- in switch statements: when a case is followed by a break, it does not execute subsequent cases and control is transfered transferred out of the switch statement.
Example
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for (number i = 0; i < 10; i = i + 1) {
if (i >= 5) {
break;
}
print(i);
} |
...
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number i = 1;
while (i <= 10) {
if (i % 3 == 0) {
i = i + 1;
continue;
}
print(i);
i = i + 1;
} |