ruff/crates/ruff_python_formatter/src/statement/stmt_if.rs

104 lines
3.0 KiB
Rust

use ruff_formatter::{format_args, write};
use ruff_python_ast::AnyNodeRef;
use ruff_python_ast::{ElifElseClause, StmtIf};
use crate::comments::SourceComment;
use crate::expression::maybe_parenthesize_expression;
use crate::expression::parentheses::Parenthesize;
use crate::prelude::*;
use crate::statement::clause::{clause_body, clause_header, ClauseHeader};
#[derive(Default)]
pub struct FormatStmtIf;
impl FormatNodeRule<StmtIf> for FormatStmtIf {
fn fmt_fields(&self, item: &StmtIf, f: &mut PyFormatter) -> FormatResult<()> {
let StmtIf {
range: _,
test,
body,
elif_else_clauses,
} = item;
let comments = f.context().comments().clone();
let trailing_colon_comment = comments.dangling(item);
write!(
f,
[
clause_header(
ClauseHeader::If(item),
trailing_colon_comment,
&format_args![
token("if"),
space(),
maybe_parenthesize_expression(test, item, Parenthesize::IfBreaks),
],
),
clause_body(body, trailing_colon_comment),
]
)?;
let mut last_node = body.last().unwrap().into();
for clause in elif_else_clauses {
format_elif_else_clause(clause, f, Some(last_node))?;
last_node = clause.body.last().unwrap().into();
}
Ok(())
}
fn fmt_dangling_comments(
&self,
_dangling_comments: &[SourceComment],
_f: &mut PyFormatter,
) -> FormatResult<()> {
// Handled by `fmt_fields`
Ok(())
}
}
/// Extracted so we can implement `FormatElifElseClause` but also pass in `last_node` from
/// `FormatStmtIf`
pub(crate) fn format_elif_else_clause(
item: &ElifElseClause,
f: &mut PyFormatter,
last_node: Option<AnyNodeRef>,
) -> FormatResult<()> {
let ElifElseClause {
range: _,
test,
body,
} = item;
let comments = f.context().comments().clone();
let trailing_colon_comment = comments.dangling(item);
let leading_comments = comments.leading(item);
write!(
f,
[
clause_header(
ClauseHeader::ElifElse(item),
trailing_colon_comment,
&format_with(|f| {
if let Some(test) = test {
write!(
f,
[
token("elif"),
space(),
maybe_parenthesize_expression(test, item, Parenthesize::IfBreaks),
]
)
} else {
token("else").fmt(f)
}
}),
)
.with_leading_comments(leading_comments, last_node),
clause_body(body, trailing_colon_comment),
]
)
}