java - 如何访问 Xtext 验证器中的上下文信息？

Question

我有一个 Xtext 语法，它做这样的事情：

Model:
  (names += Name)*
  (rules += Rule)*
;

Rule:
  'rule' ruleName = ID;

Name:
  name = ID+;

terminal ID:
  ('a'..'z')+;

我想验证ruleName已在名称块中声明。我可以像这样访问规则名称本身JavaValidator：

@Check
public void checkName(Rule rule) {
  rule.getName(); // how to compare to names without access to Model object?
}

但我无法names从Model. 我该怎么做JavaValidator？

Answer 1

或者(Model)rule.eContainer()应该给你模型

Answer 2

如果您不强制定义Name为终端，请考虑使用交叉引用：

grammar org.example.YourDSL
  with org.eclipse.xtext.common.Terminals

generate secrets "http://www.example.org/yourdsl"

Model:
  (names += Name)*
  (rules += Rule)*
;

Name:
  name=ID; // name of the property is important!
Rule:
  'rule' name=[Name];

// Override ID from org.eclipse.xtext.common.Terminals
terminal ID:
  ('a'..'z')+;