Groovy的：「在」經營者使用的列表，並附有正則表達式中

Question

有沒有辦法使用「在」運營商與內部的正則表達式列表？

List myList = ["abc", "xyz", ~/a.+z/] 

assert ("abc" in myList) == true 
assert ("xyz" in myList) == true 

assert ("abz" in myList) == true 
assert ("aby" in myList) == false 

感謝您的任何幫助。

Answer 1

我不認爲有辦法讓這個與in工作。我能想到的最好的是寫一個自定義的方法，並運行，而不是像這樣：

boolean isIn(List domain, String target) { 
    domain.find { target ==~ it } 
} 

List myList = ["abc", "xyz", ~/a.+z/] 

assert (isIn(myList, "abc")) == true 
assert (isIn(myList, "xyz")) == true 
assert (isIn(myList, "abz")) == true 
assert (isIn(myList, "aby")) == false 

---

其實，這是可能的，但你需要可以編寫自己的List類：

class MyList extends ArrayList { 
    boolean isCase(Object o) { 
    find { o ==~ it } 
    } 
} 

def myList = new MyList() 
myList.addAll(["abc", "xyz", ~/a.+z/]) 

assert ("abc" in myList) == true 
assert ("xyz" in myList) == true 

assert ("abz" in myList) == true 
assert ("aby" in myList) == false 

或者，覆蓋對列表中的實例元類isCase方法：

def myList = ["abc", "xyz", ~/a.+z/] 
myList.metaClass.isCase = { o -> 
    (delegate.find { o ==~ it }) as boolean 
} 
// asserts as before