Revision as of 11:23, 19 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
}
[catch (exception) {
   // code that handles another exception type
} ] . . . ]

The exception can be any objects (E.g. Exception object, Number object, Array object, String object...)

throw expression

throw [expression]

The expression can be any objects (E.g. Exception object, Number object, Array object, String object...)
If throw is used without the expression, it will be re-throw.

Examples

@@ Line 19: / Line 19: @@
 </pre>
-* The Parameter exeption can be any types (E.g. Number type, Array type, String type...)
+* The '''exception''' can be any objects (E.g. Exception object, Number object, Array object, String object...)
 === throw expression ===
   throw [expression]
-* The '''expression''' can be any types (E.g. Number type, Array type, String type...)
+* The '''expression''' can be any objects (E.g. Exception object, Number object, Array object, String object...)
 * If throw is used without the '''expression''', it will be re-throw.
 == <span style="color:#a52a2a;">'''Examples'''</span>  ==