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stmt_class_def.rs
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stmt_class_def.rs
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use ruff_formatter::write;
use ruff_python_ast::{Decorator, StmtClassDef};
use ruff_python_trivia::lines_after_ignoring_end_of_line_trivia;
use ruff_text_size::Ranged;
use crate::comments::format::{
empty_lines_after_leading_comments, empty_lines_before_trailing_comments,
};
use crate::comments::{leading_comments, trailing_comments, SourceComment};
use crate::prelude::*;
use crate::statement::clause::{clause_body, clause_header, ClauseHeader};
use crate::statement::suite::SuiteKind;
#[derive(Default)]
pub struct FormatStmtClassDef;
impl FormatNodeRule<StmtClassDef> for FormatStmtClassDef {
fn fmt_fields(&self, item: &StmtClassDef, f: &mut PyFormatter) -> FormatResult<()> {
let StmtClassDef {
range: _,
name,
arguments,
body,
type_params,
decorator_list,
} = item;
let comments = f.context().comments().clone();
let dangling_comments = comments.dangling(item);
let trailing_definition_comments_start =
dangling_comments.partition_point(|comment| comment.line_position().is_own_line());
let (leading_definition_comments, trailing_definition_comments) =
dangling_comments.split_at(trailing_definition_comments_start);
// If the class contains leading comments, insert newlines before them.
// For example, given:
// ```python
// # comment
//
// class Class:
// ...
// ```
//
// At the top-level in a non-stub file, reformat as:
// ```python
// # comment
//
//
// class Class:
// ...
// ```
// Note that this is only really relevant for the specific case in which there's a single
// newline between the comment and the node, but we _require_ two newlines. If there are
// _no_ newlines between the comment and the node, we don't insert _any_ newlines; if there
// are more than two, then `leading_comments` will preserve the correct number of newlines.
empty_lines_after_leading_comments(f, comments.leading(item)).fmt(f)?;
write!(
f,
[
FormatDecorators {
decorators: decorator_list,
leading_definition_comments,
},
clause_header(
ClauseHeader::Class(item),
trailing_definition_comments,
&format_with(|f| {
write!(f, [token("class"), space(), name.format()])?;
if let Some(type_params) = type_params.as_deref() {
write!(f, [type_params.format()])?;
}
if let Some(arguments) = arguments.as_deref() {
// Drop empty the arguments node entirely (i.e., remove the parentheses) if it is empty,
// e.g., given:
// ```python
// class A():
// ...
// ```
//
// Format as:
// ```python
// class A:
// ...
// ```
//
// However, preserve any dangling end-of-line comments, e.g., given:
// ```python
// class A( # comment
// ):
// ...
//
// Format as:
// ```python
// class A: # comment
// ...
// ```
//
// However, the arguments contain any dangling own-line comments, we retain the
// parentheses, e.g., given:
// ```python
// class A( # comment
// # comment
// ):
// ...
// ```
//
// Format as:
// ```python
// class A( # comment
// # comment
// ):
// ...
// ```
if arguments.is_empty()
&& comments
.dangling(arguments)
.iter()
.all(|comment| comment.line_position().is_end_of_line())
{
let dangling = comments.dangling(arguments);
write!(f, [trailing_comments(dangling)])?;
} else {
write!(f, [arguments.format()])?;
}
}
Ok(())
}),
),
clause_body(body, trailing_definition_comments).with_kind(SuiteKind::Class),
]
)?;
// If the class contains trailing comments, insert newlines before them.
// For example, given:
// ```python
// class Class:
// ...
// # comment
// ```
//
// At the top-level in a non-stub file, reformat as:
// ```python
// class Class:
// ...
//
//
// # comment
// ```
empty_lines_before_trailing_comments(f, comments.trailing(item)).fmt(f)
}
fn fmt_dangling_comments(
&self,
_dangling_comments: &[SourceComment],
_f: &mut PyFormatter,
) -> FormatResult<()> {
// handled in fmt_fields
Ok(())
}
}
pub(super) struct FormatDecorators<'a> {
pub(super) decorators: &'a [Decorator],
pub(super) leading_definition_comments: &'a [SourceComment],
}
impl Format<PyFormatContext<'_>> for FormatDecorators<'_> {
fn fmt(&self, f: &mut Formatter<PyFormatContext<'_>>) -> FormatResult<()> {
if let Some(last_decorator) = self.decorators.last() {
f.join_with(hard_line_break())
.entries(self.decorators.iter().formatted())
.finish()?;
if self.leading_definition_comments.is_empty() {
write!(f, [hard_line_break()])?;
} else {
// Write any leading definition comments (between last decorator and the header)
// while maintaining the right amount of empty lines between the comment
// and the last decorator.
let leading_line = if lines_after_ignoring_end_of_line_trivia(
last_decorator.end(),
f.context().source(),
) <= 1
{
hard_line_break()
} else {
empty_line()
};
write!(
f,
[
leading_line,
leading_comments(self.leading_definition_comments)
]
)?;
}
}
Ok(())
}
}