mirror of https://github.com/astral-sh/ruff
105 lines
2.8 KiB
Rust
105 lines
2.8 KiB
Rust
use ruff_formatter::write;
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use ruff_python_ast::Alias;
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use crate::comments::trailing_comments;
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use crate::other::identifier::DotDelimitedIdentifier;
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use crate::prelude::*;
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#[derive(Default)]
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pub struct FormatAlias;
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impl FormatNodeRule<Alias> for FormatAlias {
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fn fmt_fields(&self, item: &Alias, f: &mut PyFormatter) -> FormatResult<()> {
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let Alias {
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range: _,
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node_index: _,
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name,
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asname,
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} = item;
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write!(f, [DotDelimitedIdentifier::new(name)])?;
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let comments = f.context().comments().clone();
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// ```python
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// from foo import (
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// bar # comment
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// as baz,
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// )
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// ```
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if comments.has_trailing(name) {
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write!(
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f,
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[
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trailing_comments(comments.trailing(name)),
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hard_line_break()
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]
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)?;
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} else if asname.is_some() {
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write!(f, [space()])?;
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}
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if let Some(asname) = asname {
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write!(f, [token("as")])?;
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// ```python
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// from foo import (
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// bar as # comment
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// baz,
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// )
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// ```
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if comments.has_leading(asname) {
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write!(
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f,
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[
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trailing_comments(comments.leading(asname)),
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hard_line_break()
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]
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)?;
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} else {
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write!(f, [space()])?;
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}
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write!(f, [asname.format()])?;
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}
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// Dangling comment between alias and comma on a following line
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// ```python
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// from foo import (
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// bar # comment
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// ,
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// )
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// ```
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let dangling = comments.dangling(item);
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if !dangling.is_empty() {
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write!(f, [trailing_comments(comments.dangling(item))])?;
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// Black will move the comma and merge comments if there is no own-line comment between
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// the alias and the comma.
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//
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// Eg:
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// ```python
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// from foo import (
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// bar # one
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// , # two
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// )
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// ```
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//
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// Will become:
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// ```python
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// from foo import (
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// bar, # one # two)
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// ```
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//
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// Only force a hard line break if an own-line dangling comment is present.
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if dangling
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.iter()
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.any(|comment| comment.line_position().is_own_line())
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{
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write!(f, [hard_line_break()])?;
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}
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}
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Ok(())
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}
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}
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