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Difference between revisions of "EDT:EGL Language Part Types"
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Revision as of 11:14, 14 July 2011
Please see the parent of this page, EDT:EGL_Language.
Part Types (Table 1)
| Part Types | Core | JavaScript | Java | Debug |
| DataItem1 | |
bugs.eclipse.org/bugs/show_bug.cgi |
|
|
| Function2, 5 | |
|
|
|
| Top-level function2, 5 | |
|
|
|
| Delegate2 | |
JS:Delegates |
|
|
| Record |
|
JS:Record |
|
|
| Structured Record |
|
N/S | N/S | N/S |
| ExternalType |
|
JS:ExternalType |
|
|
| Handler |
|
JS:Handler |
|
|
| Library |
|
done |
|
|
| Service |
|
|
|
|
| Interface3 |
|
|
|
|
| Enumeration |
|
|
|
|
| Program4 |
|
N/S |
|
|
| Array |
|
|
|
|
| Nullability6 |
|
|
|
|
| DataTable |
|
N/S | N/S | N/S |
| Form |
|
N/S | N/S | N/S |
Notes on Table 1
- In RBD a DataItem can only be used for primitive types. In EDT it can be used for any type.
- See also Table 2: Function Parameters.
- Interfaces can be implemented by services and handlers (every kind of "logic part" which can be instantiated).
- There are no called programs in EDT. Use libraries for "local calls" and services for "remote calls".
- We intend to support function overloading in all implementations, even JavaScript.
- Nullability means that a variable may really be null. It's not an "I'm null" flag like in RBD. A NullValueException will be thrown if you try to access a field or function of a null variable, even a record. A NullValueException will be thrown if a null variable is an operand to a math operator, an array access, a substring access, a comparison, or a bitwise operator. The string concatenation operators will work the same as in RBD with respect to nulls. :: treats null as the empty string, and ?: results in null if either operand is null. A question mark won't be allowed on the second operand of the AS and ISA operators (the name of the type).