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Difference between revisions of "EDT:EGL Language Part Types"
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− | | bgcolor="#cccccc" | ''Record''<br> | + | | bgcolor="#cccccc" | ''Record<sup>6</sup>''<br> |
| <br>done | | <br>done | ||
| [https://bugs.eclipse.org/bugs/show_bug.cgi?id=352045 JS:Record]<br> | | [https://bugs.eclipse.org/bugs/show_bug.cgi?id=352045 JS:Record]<br> | ||
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#<span style="background: rgb(255,165,0)">There are no called programs in EDT. Use libraries for "local calls" and services for "remote calls".</span> | #<span style="background: rgb(255,165,0)">There are no called programs in EDT. Use libraries for "local calls" and services for "remote calls".</span> | ||
#<span style="background: rgb(255,165,0)">We intend to support function overloading in all implementations, even JavaScript.</span> | #<span style="background: rgb(255,165,0)">We intend to support function overloading in all implementations, even JavaScript.</span> | ||
− | #<span style="background: rgb(255,165,0)">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.</span> 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. <span style="background: rgb(255,165,0)">A question mark won't be allowed on the second operand of the AS and ISA operators (the name of the type).</span> | + | #Records are value types, so record variables may be declared with a question mark following the name of the type to indicate that they're nullable. <span style="background: rgb(255,165,0)">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.</span> 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. <span style="background: rgb(255,165,0)">A question mark won't be allowed on the second operand of the AS and ISA operators (the name of the type).</span> |
Revision as of 14:28, 19 July 2011
Please see the parent of this page, EDT:EGL Language.
Part Types (Table 1)
Part Types | Core | JavaScript | Java | Debug |
DataItem1 | 2d |
JS: DataItem |
|
|
Function2, 5 | done |
JS: Function overloading |
|
|
Top-level function2, 5 | done |
|
|
|
Delegate2 | done |
JS:Delegates |
|
|
Record6 |
done |
JS:Record |
|
|
Structured Record |
done |
N/S | N/S | N/S |
ExternalType |
done |
JS:ExternalType |
|
|
Handler |
1d |
JS:Handler |
|
|
Library |
done |
done |
|
|
Service |
1d |
|
|
|
Interface3 |
done |
|
|
|
Enumeration |
|
JS: Enumeration |
|
|
Program4 |
done |
N/S |
|
|
Array |
|
|
|
|
Nullability6 |
|
|
|
|
DataTable |
done |
N/S | N/S | N/S |
Form |
done |
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.
- Records are value types, so record variables may be declared with a question mark following the name of the type to indicate that they're nullable. 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).