Course "Domain-specific programming languages" (http://dsl-course.org). Developed by Mikhail Barash.

1. Code generation
private field with getter and setterfield
via getters and settersassignment
print statement System.out.println



Java class (separate file)
for every entity
public classentity 
generated code

2. Code generation
“take” only entities from the input
resource contains EMF model
representation of the program
file path
file contents not needed – base type of hierarchy,
no specific features
not needed
compile – will be
invoked recursively

3. Xtend Multiline template expressions
// Visual Basic
Dim unit As String
// Delphi
unit:String;
// Delphi .NET
@unit:String;
// C++
// create 10 variables
// each with one tab indentation
String unit1;
String unit2;
String unit3;
...
{ and } can be omitted
if only template
expression in body
guillemets  Shift + Ctrl + < or > Alt + q or Q
conditional
IF … ELSE … ENDIF
loop
FOR … ENDFOR
any expression within
guillemets, including
method invocation

4. Code generator in Xtend
indentation handled in a
smart way by Xtend
private n;
public int getN() {
return n;
}
public void setN(int value) {
this.n = value;
}
Compiling entity

5. Code generator in Xtend
Stringtext 
intnumber 
booleantoggle 
Type names
selection will use runtime type of fieldType
polymorphic method overloading (dispatch methods)
FieldType
BasicType:
FieldType
EntityType:
FieldType

6. Code generator in Xtend Statements and expressions
integer value (converted to string)
string value in quotes
on  true
off  false