Identifiers
Identifiers in the script provide the access to the value of an object or a local variable. In the case of a structured value, it is possible to access the whole value, the row of a structured variable, or its item through an identifier.
The following figure shows and names all possible methods of reference to a value, which are used in ESL:
Notes:
- Only colored boxes show a value.
- A green-colored box represents a value (group of values in case of a structure), with no references to other objects (ALIAS or column of the Object type).
- A red-colored box represents a value (group of values in case of a structure), with references to other objects (ALIAS or column of the Object type).
- A combination of red and green colors represents a value (group of values in case of a structure) where values and references may be combined.
- Each method of reference to value is named (red text above box).
Examples for individual types of references to value:
| Reference type (name) | Value description | Example |
|---|---|---|
| IC_C | Constant. | "Text", 1, ... |
IC_HOBJ_EXPR | Expression of INT type that is interpreted as the reference to an object. The object is enclosed in brackets on the position where the identifier is expected. | (20), (Sec\HBJ) |
IC_VOBJ_EXPR | Three comma-separated expressions enclosed in brackets:
| (H.Struct\HBJ, 2, 3) |
| IC_O | An object of a type other than the Structured variable. | Sec, SysTime, I/O tag, ... |
| IC_O_R | An object of Structured variable type. | SV.Structure |
| IC_O_R_R | The row of object Structured variable type. If the index is 0, it means the whole value, like IC_O_R. | SV.Structure[2], SV.Structure[0] |
| IC_O_R_RIA | The row item of objects of the Structured variable type. The item is Object type (a reference to an object). | SV.Structure[2]^Object |
| IC_O_R_RIN | The row item of objects of the Structured variable type. The item is not an Object type (a reference to an object). | SV.Structure[2]^Text |
| IC_L | A local variable of BOOL, INT, TEXT, TIME, or REAL types. | |
| IC_L_CONST | A constant (initialized) local variable of BOOL, INT, TEXT, TIME, or REAL type. | |
| IC_L_AN | A local variable of ALIAS type (untyped). | ALIAS _a |
| IC_L_AT | A local variable of typed ALIAS type (without index or access to item). | ALIAS (SD.RecordDef) _recA |
| IC_L_AT_R | The row of objects of the Structured variable type, to which the typed ALIAS currently refers. If the index is 0, it means the whole value. | _recA[1] or the whole value _recA[0] |
| IC_L_AT_RIA | The row item of an object of Structured variable type, to which the typed ALIAS currently refers. The item is Object type (a reference to an object). | _recA[1]^Object |
| IC_L_AT_RIN | The row item of an object of Structured variable type, to which the typed ALIAS currently refers. The item is not an Object type (a reference to an object). | _recA[1]^Text |
| IC_L_RNA | A local variable of the Record type. Reference to the whole value. | RECORD NOALIAS (SD.RecordDef) _recNA |
| IC_L_RNA_R | A local variable row of the Record type. If the index is 0, it means the whole value similar to IC_L_RNA. | _recNA[1] or the whole value _recNA[0] |
| IC_L_RNA_RIA | The row item of a local variable of Record type. The item is Object type (a reference to an object). Considering forbidden references to objects, the item represents a simple value (without predefined value type). | _recNA[1]^Object |
| IC_L_RNA_RIN | The row item of a local variable of Record type. The item is Object type (a reference to an object). Unlike IC_L_RNA_RIA, the value type of the item is defined. | _recNA[1]^Text |
| IC_L_R | A local structured variable. Reference to the whole value. | RECORD (SD.RecordDef) _rec |
| IC_L_R_R | A row of local variables of the Record type. If the index is 0, it means the whole value, like IC_L_R. | _rec[1] or the whole value _rec[0] |
| IC_L_R_RIA | The row item of a local variable of the Record type. The item is Object type (a reference to an object). | _rec[1]^Object |
| IC_L_R_RIN | The row item of a local variable of the Record type. The item is not an Object type (a reference to an object). | _rec[1]^Text |
| IC_L_NR | A local variable of the Record type (the structure type is not defined). The reference to the whole value. | RECORD () _rec |
| IC_L_NR_R | The row of local variables of the Record type (the structure type is not defined). If the index is 0, it is the whole value like IC_L_NR. | _rec[1] or the whole value _rec[0] |
| IC_L_NR_RII | The row item of local variables of the Record type (the structure type is not defined). The column is defined by the number. | _rec[1]^_iCol |
| IC_L_NRNA | A local variable of the Record type (the structure type is not defined). The reference to the whole value. | RECORD NOALIAS () _recNA |
| IC_L_NRNA_R | The row of local variables of the Record type (the structure type is not defined). If the index is 0, it is the whole value like IC_L_NRNA. | _recNA[1] or the whole value _recNA[0] |
| IC_L_NRNA_RII | The row item of local variables of the Record type (the structure type is not defined). The column is defined by the number. | _recNA[1]^_iCol |
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