mirror of https://github.com/astral-sh/ruff
111 lines
3.1 KiB
Rust
111 lines
3.1 KiB
Rust
use ruff_formatter::{format_args, write};
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use ruff_python_ast::node::AnyNodeRef;
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use ruff_python_ast::{Expr, ExprDict};
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use ruff_text_size::{Ranged, TextRange};
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use crate::comments::{leading_comments, SourceComment};
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use crate::expression::parentheses::{
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empty_parenthesized, parenthesized, NeedsParentheses, OptionalParentheses,
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};
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use crate::prelude::*;
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#[derive(Default)]
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pub struct FormatExprDict;
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struct KeyValuePair<'a> {
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key: &'a Option<Expr>,
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value: &'a Expr,
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}
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impl Ranged for KeyValuePair<'_> {
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fn range(&self) -> TextRange {
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if let Some(key) = self.key {
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TextRange::new(key.start(), self.value.end())
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} else {
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self.value.range()
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}
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}
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}
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impl Format<PyFormatContext<'_>> for KeyValuePair<'_> {
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fn fmt(&self, f: &mut PyFormatter) -> FormatResult<()> {
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if let Some(key) = self.key {
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write!(
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f,
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[group(&format_args![
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key.format(),
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token(":"),
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space(),
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self.value.format()
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])]
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)
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} else {
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// TODO(charlie): Make these dangling comments on the `ExprDict`, and identify them
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// dynamically, so as to avoid the parent rendering its child's comments.
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let comments = f.context().comments().clone();
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let leading_value_comments = comments.leading(self.value);
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write!(
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f,
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[
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// make sure the leading comments are hoisted past the `**`
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leading_comments(leading_value_comments),
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group(&format_args![token("**"), self.value.format()])
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]
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)
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}
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}
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}
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impl FormatNodeRule<ExprDict> for FormatExprDict {
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fn fmt_fields(&self, item: &ExprDict, f: &mut PyFormatter) -> FormatResult<()> {
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let ExprDict {
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range: _,
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keys,
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values,
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} = item;
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debug_assert_eq!(keys.len(), values.len());
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let comments = f.context().comments().clone();
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let dangling = comments.dangling(item);
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if values.is_empty() {
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return empty_parenthesized("{", dangling, "}").fmt(f);
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}
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let format_pairs = format_with(|f| {
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let mut joiner = f.join_comma_separated(item.end());
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for (key, value) in keys.iter().zip(values) {
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let key_value_pair = KeyValuePair { key, value };
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joiner.entry(&key_value_pair, &key_value_pair);
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}
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joiner.finish()
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});
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parenthesized("{", &format_pairs, "}")
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.with_dangling_comments(dangling)
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.fmt(f)
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}
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fn fmt_dangling_comments(
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&self,
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_dangling_comments: &[SourceComment],
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_f: &mut PyFormatter,
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) -> FormatResult<()> {
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// Handled by `fmt_fields`
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Ok(())
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}
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}
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impl NeedsParentheses for ExprDict {
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fn needs_parentheses(
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&self,
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_parent: AnyNodeRef,
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_context: &PyFormatContext,
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) -> OptionalParentheses {
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OptionalParentheses::Never
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}
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}
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