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feat(rome_js_formatter): object pattern formatting #2729
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denbezrukov
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| // 3. we compute the layout | ||
| // 4. we write the left node inside the main buffer based on the layout | ||
| let mut buffer = VecBuffer::new(f.state_mut()); | ||
| let is_left_short = self.write_left(&mut buffer)?; |
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You can do
write!(buffer, [format_with(|f| self.write_left(f)])?;
to get a formatter for a buffer
| let layout = self.layout(is_left_short)?; | ||
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| let formatted_element = buffer.into_element(); | ||
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| if layout == AssignmentLikeLayout::BreakLeftHandSide { |
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This works fine but has the downside (isn't specific to here, we have this all over the place), that the implementation needs to copy all elements that have been written to the VecBuffer. I'll spend a few minutes looking into a InternBuffer that returns an interned element.
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I just copied what we already do in other places :D
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Summary
This PR advances works around "assignments like", by partially implementing #2424
Here's the main works done:
const { b } = a;andconst a = { b }using the same function, this is because in their AST they are treated with the same AST nodes. Rome used two different nodes:JsObjectAssignmentPatternandJsObjectBindingPattern. In this PR I created a new union calledJsObjectPatternLikewhere we apply the same formatting for both patterns;BreakLeftHandSideandChainTailArrowChain. The first had required some changes inside the object pattern formatting, which are included in this PR, the second one won't have the desidered changes because of how things are built.WhenTurns out the implementation was easier than expected, and it is now implemented!ChainTailArrowChain, prettier signals this layout to another function, which reads it and applies another layout. Here's the code that reads the layout. I'd prefer to figure this out later, outside of this PR (fortunately we don't break any existing code)JsAnyAssignmentLike, calledRightAssignmentLike. This was needed because the right hand side of an assignment like can be anJsAnyExpressionorJsAnyAssignmentPattern;BreakLeftHandSide, because the rest of the checks are done on other types of nodes (type aliases and type parameters), which are not covered in this PR.Test Plan
I created new test cases that should cover the new layouts