英文:
Drools rules in xtext format
问题
我对Xtext还不熟悉，但我想使用它来为Drools规则生成一些代码。我有以下问题，我不知道如何编写方言，以便在Order()之前加上$order。如果有人能向我展示如何处理这个例子，我将不胜感激。
我迄今为止尝试过以下内容：
Model:
declarations+=Declaration*;
Declaration:
Rule;
State:
name=ID
;
Rule:
'rule' ruleDescription=STRING
'@specification' specificationDescription=STRING
'ruleflow-group' ruleflowDescription=STRING
'when' when=[State|QualifiedName]
'then' then=[State|QualifiedName];
QualifiedName: ID ('.' ID)*;
DolarSign: ('$' ID)*;
这是规则的代码：
rule "apply 10% discount to all items over US$ 100,00 in an order"
@specification "101"
ruleflow-group "All"
when
$order : Order(appliedBefore == null)
Order($name : /customer/name) from $order
$item : OrderItem( value > 100 ) from $order.items
then
System.out.println("10% applied" + $name);
end
英文:
I am new to Xtext and I want to use it to generate some code for drools rules. I have the following problem, I don't know how to write the dialect to have that $order in front of a Order(). I would really appreciate if someone will show me how to handle this example.
This is what I have tried so far
Model:
declarations+=Declaration*;
Declaration:
Rule;
State:
name=ID
;
Rule:
'rule' ruleDescription=STRING
'@specification'specificationDescription=STRING
'ruleflow-group' ruleflowDescription=STRING
'when' when=[State|QualifiedName]
'then' then=[State|QualifiedName];
QualifiedName: ID ('.' ID)*;
DolarSign: ('$' ID)*;
And here is the code for the rule:
rule "apply 10% discount to all items over US$ 100,00 in an order"
@specification "101"
ruleflow-group "All"
when
$order : Order(appliedBefore == null)
Order($name : /customer/name) from $order
$item : OrderItem( value > 100 ) from $order.items
then
System.out.println("10% applied" + $name);
end
答案1
得分: 0
你应该能够简单地使用：
'when $' when=[State|QualifiedName]
英文:
You should be able to simply use:
'when $' when=[State|QualifiedName]
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