Add rule to check that a single top level class name matches the file name #194
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JelloRanger
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Hi Jacob (and thank you for the PR). Everything inside Starting from ktlint@0.22.0 file path is now accessible via Could you please update the PR to use that instead? Also,
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- Get filepath from userData - Ignore non .kt files - Change offset to 0 for errror reporting - Removed ASTNodeExtensions, moved visit() method to internal util file
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Thanks for the feedback! (and adding the file path to userData :)) Updated the PR. |
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| val topLevelClassNames = mutableListOf<String>() | ||
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| node.visit { |
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It's better to avoid whole AST traversal with something like
val topLevelClassNames = node.getChildren(null)
.filter { it.elementType == KtStubElementTypes.CLASS }
.mapNotNull { it.findChildByType(KtTokens.IDENTIFIER)?.text }There was a problem hiding this comment.
I like this a lot more (removes the need to check for immediate parent and should also be more efficient :))
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| val name = Paths.get(node.getUserData(KtLint.FILE_PATH_USER_DATA_KEY)).fileName.toString().substringBefore(".") |
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node.getUserData(KtLint.FILE_PATH_USER_DATA_KEY) should be extracted to a varible (referenced twice).
| val name = Paths.get(node.getUserData(KtLint.FILE_PATH_USER_DATA_KEY)).fileName.toString().substringBefore(".") | ||
| if (topLevelClassNames.size == 1 && name != topLevelClassNames.first()) { | ||
| emit(0, | ||
| "Single top level class name [${topLevelClassNames.first()}] does not match file name", |
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How about Class ${className} should be declared in a file named ${className}.kt?
- Filter immediate children to get top level classes - Changed error message
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Perfect. Thank you so much, Jacob! |
This rule adheres to both Kotlin and Android Kotlin style guides:
https://kotlinlang.org/docs/reference/coding-conventions.html#source-file-names
https://android.github.io/kotlin-guides/style.html#naming
In order to make this change possible I had to plumb through the fileName into each Rule. This will also allow us to add additional style checks in the future (i.e. no underscores in file names, directory path matches package path, etc.)
Regarding autoFormat, I don't think there's a good solution here. If a violation occurs, then it's impossible for the tool to automatically determine whether to use the file name or the class name. The only alternative I can think of to this problem is to have Ktlint prompt the user for which name to use every time a violation occurs, which could be built after #79 is complete.