Revision as of 03:36, 20 December 2011

Exception Handling (Error Runtime Handling)

An exception is an error occurs in the runtime (the excution) of program. The CGScript language uses the try/catch statement and the throw expression to implement the exception handling.

Syntax

try-catch statement

try {
   // codes that could throw an exception
}
catch (exception) {
   // codes that execute when exception-declaration is thrown in the try block
}

The exception can be any type (E.g. exception object, number, string...)
CGScript language does not support multi catch clauses.

throw expression

throw [expression]

The expression can be any type (E.g. exception object, number, string...)
If throw is used in catch clause, it will be re-throw. See below examples for information about re-throw.

Examples

@@ Line 4: / Line 4: @@
 An exception is an error occurs in the runtime (the excution) of program. The CGScript language uses the '''try/catch statement''' and the '''throw''' expression to implement the exception handling.
 == <span style="color:#a52a2a;">'''Syntax'''</span>  ==
@@ Line 14: / Line 15: @@
     // codes that execute when exception-declaration is thrown in the try block
 }
-[catch (exception) {
-   // code that handles another exception type
-} ] . . . ]
 </pre>
-* The '''exception''' can be any objects (E.g. Exception object, Number object, Array object, String object...)
+* The '''exception''' can be any type (E.g. exception object, number, string...)
+* CGScript language does not support multi catch clauses.
 === throw expression ===
   throw [expression]
-* The '''expression''' can be any objects (E.g. Exception object, Number object, Array object, String object...)
+* The '''expression''' can be any type (E.g. exception object, number, string...)
-* If throw is used without the '''expression''', it will be re-throw.
+* If throw is used in catch clause, it will be re-throw. See below examples for information about re-throw.
 == <span style="color:#a52a2a;">'''Examples'''</span>  ==