The document discusses Xtext, a framework for creating domain-specific languages (DSLs). It presents Xtext's capabilities for defining DSL grammars, generating parsers, editors, validators and more from those grammars. Examples show how Xtext can be used to create a TODO list DSL and generate associated editors, auto-completion and outline views.

1. Meeting Marzo 2010
Xtext:
un framework per
la creazione di DSL
Federico Tomassetti

2. Menu
1. DSL......................
2. Xtext: cosa..........
3. Xtext: come.........
Federico Tomassetti – Meeting Marzo 2010

3. V.I.D.*
HTML CSS
* V.I.D. = Very Important DSL
Federico Tomassetti – Meeting Marzo 2010

4. Dominio Tecnologia
(Cosa) (Come)
DSL
Federico Tomassetti – Meeting Marzo 2010

5. T
E
D C
O
M (COSA)
No (COME)
N
O
I
N
DSL L
O
I G
O I
A
Federico Tomassetti – Meeting Marzo 2010

6. TodoFile :
(Category)* (Todo)*;
Category: Parser
'category' ID;
Todo:
'todo' STRING ('in' ID)?
(Priority)? ('due' MyDate)?;
Priority:
'low' |'medium'|'high'; Editor
MyDate:
INT '/' INT '/' INT;
Federico Tomassetti – Meeting Marzo 2010

7. Validazione
Autocompletamento
Outline
diamo un'occhiata...
Federico Tomassetti – Meeting Marzo 2010

8. @Check
public void checkTextLength(Todo todo) {
if (todo.getText().length() == 0) {
error("Todo text should be not void",
TodoDslPackage.TODO__TEXT);
} else if (todo.getText().length() < 5) {
warning("Todo text should be at least 5
characters long",
TodoDslPackage.TODO__TEXT);
}
}
Federico Tomassetti – Meeting Marzo 2010

9. public void completeTodo_CategoryId(Todo model,
Assignment assignment, ContentAssistContext context,
ICompletionProposalAcceptor acceptor)
{
TodoFile todoFile = (TodoFile)model.eContainer();
for (Category category : todoFile.getCategories()){
String proposal = category.getId();
ICompletionProposal completionProposal =
createCompletionProposal(
proposal, context);
acceptor.accept(completionProposal);
}
}
Federico Tomassetti – Meeting Marzo 2010

10. private ContentOutlineNode createUncategorizedNode(
TodoFile todoFile,
ContentOutlineNode parentNode)
{
ContentOutlineNode node = new ContentOutlineNode();
node.setLabel("<Uncategorized>");
for (Todo todo : todoFile.getTodos()) {
if (todo.getCategoryId() == null) {
ContentOutlineNode childNode =
super.newOutlineNode(todo, node);
}
}
return node;
}
Federico Tomassetti – Meeting Marzo 2010

11.
Codegeneration 2008
Federico Tomassetti – Meeting Marzo 2010