问题描述
https://github.com/complyue/dcp是纠正此错误的最低限度的工作示例
sed s/ //g我认为是$ cabal run dcp:dcp < samples/basic.txt
Up to date
dcp: 10:1:
|
10 | method doXXX() pass
| ^
unexpected 'm'
expecting ';'
CallStack (from HasCallStack):
error,called at src/Parser.hs:149:14 in main:Parser
$
导致失败：
https://github.com/complyue/dcp/blob/1df7ad590d78d4fa9a017eb53f9f265e291bdfa7/src/Parser.hs#L50-L54
optionalSemicolon它的定义如下： https://github.com/complyue/dcp/blob/1df7ad590d78d4fa9a017eb53f9f265e291bdfa7/src/Parser.hs#L31-L32
findIt = do
-- ignore leading whitespaces and an optional semicolon in between
nbsc >> optionalSemicolon >> nbsc
-- try get a doc comment block
getIt >>= \case
我无法解释为什么它会失败。
解决方法
事实证明，这是因为symbol中的optionalSemicolon引用了sc，而不是引用了 optionalComma :: Parser Bool
-optionalComma = fromMaybe False <$> optional (True <$ symbol ",")
+optionalComma = fromMaybe False <$> optional (True <$ string ",")
optionalSemicolon :: Parser Bool
-optionalSemicolon = fromMaybe False <$> optional (True <$ symbol ";")
+optionalSemicolon = fromMaybe False <$> optional (True <$ string ";")
。像这样解决：
object