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Formatting: respect newlines [message #1857028]

Fri, 13 January 2023 14:30

Simon Cockx

Messages: 45
Registered: October 2021

Member

Suppose I'm writing a formatter for an expression language, and I would like to allow two ways of writing an expression.

In the following example, the `extract` operator should either be preceded by a single space or it should start on a new line.

expr extract prop

expr
    extract prop

However, if it starts on a new line, I would like to add indentation. Is it possible to express this somehow?

Examples of reformatting:

expr
extract
prop

expr
    extract prop

expr        extract
prop

expr extract prop

expr
            extract prop

expr
    extract prop

[Updated on: Fri, 13 January 2023 14:35]

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Re: Formatting: respect newlines [message #1857031 is a reply to message #1857028]

Fri, 13 January 2023 14:54

Christian Dietrich

Messages: 14457
Registered: July 2009

Senior Member

You could read the node model in the formatter, check for nl,
Then if else

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Re: Formatting: respect newlines [message #1857033 is a reply to message #1857031]

Fri, 13 January 2023 15:47

Simon Cockx

Messages: 45
Registered: October 2021

Member

Slide 138 of https://www.slideshare.net/meysholdt/xtexts-new-formatter-api covered this, thanks. :)

Basically I can do something like

if (extractExpression.regionFor.keyword("extract").previousHiddenRegion.isMultiline) {
 ...
} else {
 ...
}

Great stuff!

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