Live Scripts
You can copy/paste any of the following scripts in the editor above, modify them if you want, and finally run them.Hello World
Description: The ubiquitous hello world script.
'Hello World'.println();
Variables and Control Flow
Description: A script that demonstrates defining and using variables and basic control flow constructs.
var i : Integer := 5;
if (i > 3) {
for (j in Sequence{1..i}) {
j.print();
if (hasMore) ','.print();
}
}
if (i > 3) {
for (j in Sequence{1..i}) {
j.print();
if (hasMore) ','.print();
}
}
Model Querying
Description: A script that demonstrates the model querying facilities of EOL.
-- In this script, we query Ecore to find out:
-- ... how many classes it has
EClass.all.size().println('All classes: ');
-- ... how many abstract classes it has
EClass.all.select(c|c.abstract)
.size().println('Abstract classes: ');
-- ... the names of its classes and how many
-- features each one has
'Class names: '.println();
for (c in EClass.all) {
var toPrint := ' ' + c.name;
toPrint := toPrint + '->' +
c.eStructuralFeatures.size();
toPrint.println();
}
-- ... how many classes it has
EClass.all.size().println('All classes: ');
-- ... how many abstract classes it has
EClass.all.select(c|c.abstract)
.size().println('Abstract classes: ');
-- ... the names of its classes and how many
-- features each one has
'Class names: '.println();
for (c in EClass.all) {
var toPrint := ' ' + c.name;
toPrint := toPrint + '->' +
c.eStructuralFeatures.size();
toPrint.println();
}
Operations
Description: This script defines and invokes an addHello() operation on strings.
'John'.addHello().println();
operation String addHello() {
return 'Hello ' + self;
}
operation String addHello() {
return 'Hello ' + self;
}
Collections
Description: The script demonstrates defining a collection (sequence) and then filtering and navigating it through the built-in EOL operations.
var seq := Sequence{1..10};
seq.size().println();
seq.reject(i|i > 5).println();
seq.invert().println();
seq.collect(i|i*2).println();
seq.size().println();
seq.reject(i|i > 5).println();
seq.invert().println();
seq.collect(i|i*2).println();
Random
Description: This script demonstrates the random() operation that picks a random element of the collection on which it is invoked.
for (i in Sequence{1..5}) {
EClass.all.random().name.println();
}
EClass.all.random().name.println();
}
Delete
Description: This script demonstrates deleting model elements.
var randomClass := EClass.all.random();
EClass.all.size().println('Before delete: ');
delete randomClass;
EClass.all.size().println('After delete: ');
EClass.all.size().println('Before delete: ');
delete randomClass;
EClass.all.size().println('After delete: ');
Epsilon Live
In the editor on the left, you can write and run EOL scripts (what is EOL?) from your browser, without needing to download or install anything in your computer.
Except for playing with the basic features of the language, you can also query and modify a real EMF model (which for simplicity, is Ecore itself).
Below are several small EOL scripts which you can try. To try a script, copy/paste it in the editor on the left and then click the Run button to run it and see its output in the console.