Proper way to handle indentation

已回答

创建于 2024年06月13日 12:04

Given nested structure e.g.

item1 {
	item2 {
	}
}

I would like the IDE to place caret at one additional level of indentation when I hit Enter after `item2 {`.

By default indentation would be the same as of parent element (item2), but it should be nested one level more.

I guess this happens because I skip PsiWhitespace when building CodeBlock tree as tutorial suggests and thus I don't have control over empty lines (which is the initial state of the new line after I hit Enter).

What would be the proper way of handling it? I tried `EditorModificationUtilEx.insertStringAtCaret(editor, " ")` inside `EnterHandlerDelegate` but then IDE sees these WSs as normal whitespaces not as indentation (when I hit Backspace it first deletes these custom WSs and only after that upon additional Backspace hit it deletes whole indentation and places caret at previous line).

Should I consider including WS symbols into CodeBlock tree? Or is there a simpler way?

4 条评论

Karol Lewandowski

创建于 2024年06月17日 11:51

Hi,

Have you tried to implement getChildAttributes? See https://plugins.jetbrains.com/docs/intellij/code-formatting.html#building-the-block-tree.

Rembrandt107

创建于 2024年06月18日 11:04

Hi,

The new child line is initially empty, thus not a part of block tree (since I drop WSs) and consequently no child attributes are applied.

Should I include WSs into block tree and handle all of them explicitly? (just, will it play well with spacing builder etc?)

Karol Lewandowski

创建于 2024年06月18日 13:28

Sorry, but I don't understand what the problem is. Sticking to recommendations from the documentation should allow implementing it.

Your language looks similar to JSON. Maybe its implementation can help?
https://github.com/JetBrains/intellij-community/blob/master/json/src/com/intellij/json/formatter/JsonBlock.java

Rembrandt107

创建于 2024年06月19日 17:12

The issue is that I get cursor like this after hitting enter

item1 {
	item2 {
	|
	}
}

but I'd like to get it like this

item1 {
	item2 {
		|
	}
}

Thanks for your recommendation, I tried to look into JSON implementation. It filters out WSs as well (if (isWhitespaceOrEmpty(child)) continue;), so I just don't get how it manages to apply additional level of indentation on empty line, maybe I'll have to “debug” it

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