SCARLET - Identifiers


(..Source Code Components)	Contents	Index	(Constants..)

2.3 Identifiers (Identifier)

Whenever we want to label a new object, we are in need of an identifier. Such objects are usually symbolic constants or variables, but in SCARLET also registers, and neighbours, and finally the retina, and the local rule function themselves. In order to make clear which kind of object they shall label in further syntax diagrams, identifiers are often not simply called Identifier but somehow different (i.e., IntConstantIdentifier, StringRegIdentifier, ...) Below we give a summary of all non-terminal symbols that are actually just identifiers and what they label.

Non-terminal Symbol	Used for ...
IntIdentifier, IntConstantIdentifier	symbolic integer constants
StringIdentifier, StringConstantIdentifier	symbolic string constants
BoolIdentifier, BoolConstantIdentifier	symbolic boolean constants
CellIdentifier, CellConstantIdentifier	symbolic cell constants
IntVar, Identifier	integer variables
StringVar, Identifier	string variables
BoolVar, Identifier	boolean variables
CellVar, Identifier	cell variables
StringRegIdentifier, Identifier	string registers
IntRegIdentifier, Identifier	integer registers
NeighbourIdentifier	neighbours
Identifier	retinas
Identifier	local rule tables

Ensure that the same identifier is not used twice for different objects within the same program.

Identifier - Syntax:

Legal identifiers consist of (at least one) capital or small letters (Letter), dashes, or digits (Digit). It is not allowed to use a digit at the beginning!

Here, too, the compiler will not distinguish between capital and small letters.


(..Source Code Components)	Contents	Index	(Constants..)