EDT:EGL Language

General Notes

• This document is not finished yet!

• "N/S" means Not Supported.
• Anything that exists in RBD but isn't mentioned here is not included in EDT.
  
• The work in the Core category includes the parser, model, and validation.
  

Table 1: Part Types

Part Types	Core	JavaScript	Java	Debug
DataItem1
Function2
Top-level function2
Delegate2
Record
Structed Record		N/S	N/S	N/S
ExternalType
Handler
Library
Service
Interface3
Enumeration
Program4		N/S
Array
Nullability
DataTable		N/S	N/S	N/S
Form		N/S	N/S	N/S

Notes on Table 1

1. In RBD a DataItem can only be used for primitive types.  In EDT it can be used for any type.
2. See also Table 2: Function Parameters.
   
3. Interfaces can be implemented by services and handlers (every kind of "logic part" which can be instantiated).
   
4. There are no called programs. Use libraries for "local calls" and services for "remote calls".
   

Table 2: Function Parameters

Function Parameters	Core	JavaScript	Java	Debug
In1
Out
Inout1
Ellipsis
Const
Field		N/S	N/S	N/S
SqlNullable		N/S	N/S	N/S

Notes on Table 2

1. The default parameter modifier is In for references and Inout for values.
   

Table 3: Primitive Types

Primitive Types	Core	JavaScript	Java	Debug
Any
Boolean
Dictionary
String(N)1
String2
Timestamp3
Blob		N/S
Clob		N/S
Smallint
Int
Bigint
Decimal(N,M)
Decimal(N)
Decimal4
Float
Smallfloat
Number5
Byte(N)6
Byte7
Arraydictionary		N/S	N/S	N/S
Char		N/S	N/S	N/S
Dbchar		N/S	N/S	N/S
Mbchar		N/S	N/S	N/S
Unicode		N/S	N/S	N/S
Hex6		N/S	N/S	N/S
Date3		N/S	N/S	N/S
Time3		N/S	N/S	N/S
Interval3		N/S	N/S	N/S
Bin		N/S	N/S	N/S
Num		N/S	N/S	N/S
Numc		N/S	N/S	N/S
Pacf		N/S	N/S	N/S
Money		N/S	N/S	N/S

Notes on Table 3

1. String(N) is a reference type in EDT.
   
2. String is a reference type in EDT.
   
3. Timestamp is the only supported date/time type. Use it in place of RBD's date, time, and interval. Date/time math produces timestamps or numbers.
   
4. Decimal with no length or decimals is a reference type with an immutable value.
   
5. Number is a reference type with an immutable value. Unlike in RBD, number variables can be declared anywhere a variable declaration is allowed.
   
6. Byte(N) is a value type similar to RBD's hex. N indicates the number of bytes in the value.
   
7. Byte with no length is a reference type with an immutable value of any length.
   

Table 4: Statements

Statements	Core	JavaScript	Java	Debug
Variable declaration
Const declaration
Assignment
Move1		N/S	N/S	N/S
Return
Function invocation
Call2
Label
Transfer		N/S
Throw
Try
Case
If
While
For
Foreach3
Exit
Continue
Empty statement (a semicolon)
Add		N/S
Close		N/S
Delete		N/S
Get		N/S
Replace		N/S
Execute4		N/S
Prepare4		N/S
Open4		N/S
FreeSQL4		N/S
Goto		N/S	N/S	N/S
Set		N/S	N/S	N/S
Converse		N/S	N/S	N/S
Display		N/S	N/S	N/S
Print		N/S	N/S	N/S
Forward		N/S	N/S	N/S
Show		N/S	N/S	N/S
OpenUI		N/S	N/S	N/S

Notes on Table 4

1. In RBD, a move statement between two references does a deep copy. Reference types should include a deep copy function to provide the same functionality in EDT.
   
2. EDT doesn't have called programs, but services and native programs can be called.
   
3. EDT's foreach statement will support iterating over an array.
   
4. Support for these statements is tentative, pending the design for JPA in EDT.
   

What's left...

• Operators and expressions
• Conversions
• Stereotypes
• Annotations
• Language compliance test