It's possible to define your own structures. A structure is a collection of variables like for example a point that consist of an x and a y coordinate:

// Define a point structure
.struct Point {x,y}

// Create a point with x=1 and y=2 and print it
.var p1 = Point(1,2)
.print ”p1.x=” + p1.x
.print ”p1.y=” + p1.y

// Create a point with the default contructor and modify its arguments
.var p2 = Point()
.eval p2.x =3
.eval p2.y =4

You define a structure with the .struct directive. The above structure has the name ‘Point’ and consists of the variables x and y. To create an instance of the structure, you use its name as a function. You can either supply no arguments or give the init values of all the variables. You use the values generated by structures as any other variables, ex:

        lda #0
        ldy #p1.y
        sta charset+(p1.x>>3)*height,y

You can get access to informations about the struct and access the fields in a more generic way by using the struct’s functions:

.struct Person{firstName,lastName}
.var p1 = Person(“Peter”,”Schmeichel”)

.print p1.getStructName()        // Prints ‘Person’ 
.print p1.getNoOfFields()        // Prints ‘2’
.print p1.getFieldNames().get(0) // Prints ‘firstName’

.eval p1.set(0,”Kasper”)         // Sets firstName to Kasper 
.print p1.get(“lastName”)        // Prints “Schmeichel”


// Copy values from one struct to another
.var p2 = Person()
.for (var i=0; i<p1.getNoOfFields(); i++) 
    .eval p2.set(i,p1.get(i))

// Print the content of a struct: 
//   firstName = Casper
//   lastName = Schmeichel
.for (var i=0; i<p1.getNoOfFields(); i++) {
    .print p1.getFieldNames().get(i) + “ = “ + p1.get(i)
}

Here is a list of the functions defined on struct values: