我正在尝试对此功能进行测试
let extract_one_rule (rule:Rule.t<'a,'b>) =
let rec expand = function
|PAlt (a,b) -> expand a @ expand b
|PSeq (a,b) -> let wrap = List.map (fun x -> (x.rule, fun r -> {x with rule = r})) a
|> List.unzip
in
let rec gen = function
| hd::tl -> [for x in hd -> x :: ( gen tl |> List.concat)]
| [] -> []
in
fst wrap |> List.map expand |> gen
|> List.map (fun x -> PSeq ((List.map2 ( |> ) x (snd wrap)),b))
|PRef _
|PLiteral _
|PToken _ as t -> [t]
| _ -> (System.Console.WriteLine("incorrect tree for alternative expanding!")
; failwith "incorrect tree for alternative expanding!")
in
expand rule.body |> List.map (fun x -> {rule with body = x})
使用 FsCheck 所以我有这个
let ExpandAlterTest(t : Rule.t<Source.t,Source.t> ) = convertToMeta t |> List.forall (fun x -> ruleIsAfterEBNF x)
但我会看到异常“替代扩展的树不正确!” 但是当我这样使用时
let ExpandAlterTest(t : Rule.t<Source.t,Source.t> ) = (correctForAlExp t.body) ==> lazy ( convertToMeta t |> List.forall (fun x -> ruleIsAfterEBNF x))
NUnit 不会停止工作 为什么会这样?