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Indent statements in suppressed ranges (#6507)

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Micha Reiser 2023-08-15 08:00:35 +02:00 • committed by GitHub
parent e1e213decf
commit 232b44a8ca
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18 changed files with 852 additions and 59 deletions
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37
crates/ruff_python_formatter/src/lib.rs
View file

@ -255,31 +255,16 @@ if True:
#[ignore]
#[test]
fn quick_test() {
let src = r#"
with (
[
"aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa",
"bbbbbbbbbb",
"cccccccccccccccccccccccccccccccccccccccccc",
dddddddddddddddddddddddddddddddd,
] as example1,
aaaaaaaaaaaaaaaaaaaaaaaaaa
+ bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb
+ cccccccccccccccccccccccccccc
+ ddddddddddddddddd as example2,
CtxManager2() as example2,
CtxManager2() as example2,
CtxManager2() as example2,
):
...
let src = r#"def test():
# fmt: off
with [
"aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa",
"bbbbbbbbbb",
"cccccccccccccccccccccccccccccccccccccccccc",
dddddddddddddddddddddddddddddddd,
] as example1, aaaaaaaaaaaaaaaaaaaaaaaaaa * bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb * cccccccccccccccccccccccccccc + ddddddddddddddddd as example2, CtxManager222222222222222() as example2:
...
a + b
# suppressed comments
a + b # formatted
"#;
// Tokenize once
@ -304,9 +289,9 @@ with [
// Use `dbg_write!(f, []) instead of `write!(f, [])` in your formatting code to print some IR
// inside of a `Format` implementation
// use ruff_formatter::FormatContext;
// dbg!(formatted
// formatted
// .document()
// .display(formatted.context().source_code()));
// .display(formatted.context().source_code());
//
// dbg!(formatted
// .context()

325
crates/ruff_python_formatter/src/verbatim.rs
View file

@ -1,11 +1,16 @@
use std::borrow::Cow;
use std::iter::FusedIterator;
use ruff_formatter::write;
use unicode_width::UnicodeWidthStr;
use ruff_formatter::{write, FormatError};
use ruff_python_ast::node::AnyNodeRef;
use ruff_python_ast::{Ranged, Stmt};
use ruff_python_parser::lexer::{lex_starts_at, LexResult};
use ruff_python_parser::{Mode, Tok};
use ruff_python_trivia::lines_before;
use ruff_text_size::TextRange;
use ruff_source_file::Locator;
use ruff_text_size::{TextRange, TextSize};
use crate::comments::format::{empty_lines, format_comment};
use crate::comments::{leading_comments, trailing_comments, SourceComment};
@ -80,6 +85,7 @@ pub(crate) fn write_suppressed_statements_starting_with_trailing_comment<'a>(
) -> FormatResult<&'a Stmt> {
let comments = f.context().comments().clone();
let source = f.context().source();
let indentation = Indentation::from_stmt(last_formatted.statement(), source);
let trailing_node_comments = comments.trailing_comments(last_formatted);
let mut trailing_comment_ranges =
@ -131,10 +137,13 @@ pub(crate) fn write_suppressed_statements_starting_with_trailing_comment<'a>(
write!(
f,
[
verbatim_text(TextRange::new(
format_off_comment.end(),
format_on_comment.start(),
)),
FormatVerbatimStatementRange {
verbatim_range: TextRange::new(
format_off_comment.end(),
format_on_comment.start(),
),
indentation
},
trailing_comments(std::slice::from_ref(format_on_comment)),
trailing_comments(formatted_comments),
]
@ -163,7 +172,7 @@ pub(crate) fn write_suppressed_statements_starting_with_trailing_comment<'a>(
// All comments in this range are suppressed
SuppressionComments::Suppressed { comments: _ } => {}
// SAFETY: Unreachable because the function returns as soon as we reach the end of the suppressed range
// SAFETY: Unreachable because the function returns as soon as it reaches the end of the suppressed range
SuppressionComments::SuppressionStarts { .. }
| SuppressionComments::Formatted { .. } => unreachable!(),
}
@ -195,7 +204,11 @@ pub(crate) fn write_suppressed_statements_starting_with_trailing_comment<'a>(
// # a trailing comment
// ```
else if let Some(last_comment) = trailing_node_comments.last() {
verbatim_text(TextRange::new(format_off_comment.end(), last_comment.end())).fmt(f)?;
FormatVerbatimStatementRange {
verbatim_range: TextRange::new(format_off_comment.end(), last_comment.end()),
indentation,
}
.fmt(f)?;
Ok(last_formatted.statement())
}
// The suppression comment is the very last code in the block. There's nothing more to format.
@ -226,10 +239,10 @@ fn write_suppressed_statements<'a>(
let comments = f.context().comments().clone();
let source = f.context().source();
// TODO(micha) Fixup indent
let mut statement = first_suppressed;
let mut leading_node_comments = first_suppressed_leading_comments;
let mut format_off_comment = format_off_comment;
let indentation = Indentation::from_stmt(first_suppressed.statement(), source);
loop {
for range in CommentRangeIter::in_suppression(leading_node_comments, source) {
@ -266,10 +279,13 @@ fn write_suppressed_statements<'a>(
write!(
f,
[
verbatim_text(TextRange::new(
format_off_comment.end(),
format_on_comment.start(),
)),
FormatVerbatimStatementRange {
verbatim_range: TextRange::new(
format_off_comment.end(),
format_on_comment.start(),
),
indentation
},
leading_comments(std::slice::from_ref(format_on_comment)),
leading_comments(formatted_comments),
]
@ -343,10 +359,13 @@ fn write_suppressed_statements<'a>(
write!(
f,
[
verbatim_text(TextRange::new(
format_off_comment.end(),
format_on_comment.start()
)),
FormatVerbatimStatementRange {
verbatim_range: TextRange::new(
format_off_comment.end(),
format_on_comment.start()
),
indentation
},
format_comment(format_on_comment),
hard_line_break(),
trailing_comments(formatted_comments),
@ -380,7 +399,11 @@ fn write_suppressed_statements<'a>(
.last()
.map_or(statement.end(), Ranged::end);
verbatim_text(TextRange::new(format_off_comment.end(), end)).fmt(f)?;
FormatVerbatimStatementRange {
verbatim_range: TextRange::new(format_off_comment.end(), end),
indentation,
}
.fmt(f)?;
return Ok(statement.statement());
}
@ -573,33 +596,283 @@ impl Format<PyFormatContext<'_>> for TrailingFormatOffComment<'_> {
}
}
struct VerbatimText(TextRange);
/// Stores the indentation of a statement by storing the number of indentation characters.
/// Storing the number of indentation characters is sufficient because:
/// * Two indentations are equal if they result in the same column, regardless of the used tab size.
/// This implementation makes use of this fact and assumes a tab size of 1.
/// * The source document is correctly indented because it is valid Python code (or the formatter would have failed parsing the code).
#[derive(Copy, Clone)]
struct Indentation(u32);
fn verbatim_text<T>(item: T) -> VerbatimText
impl Indentation {
fn from_stmt(stmt: &Stmt, source: &str) -> Indentation {
let line_start = Locator::new(source).line_start(stmt.start());
let mut indentation = 0u32;
for c in source[TextRange::new(line_start, stmt.start())].chars() {
if is_indent_whitespace(c) {
indentation += 1;
} else {
break;
}
}
Indentation(indentation)
}
fn trim_indent(self, ranged: impl Ranged, source: &str) -> TextRange {
let range = ranged.range();
let mut start_offset = TextSize::default();
for c in source[range].chars().take(self.0 as usize) {
if is_indent_whitespace(c) {
start_offset += TextSize::new(1);
} else {
break;
}
}
TextRange::new(range.start() + start_offset, range.end())
}
}
/// Returns `true` for a space or tab character.
///
/// This is different than [`is_python_whitespace`] in that it returns `false` for a form feed character.
/// Form feed characters are excluded because they should be preserved in the suppressed output.
const fn is_indent_whitespace(c: char) -> bool {
matches!(c, ' ' | '\t')
}
/// Formats a verbatim range where the top-level nodes are statements (or statement-level comments).
///
/// Formats each statement as written in the source code, but adds the right indentation to match
/// the indentation of formatted statements:
///
/// ```python
/// def test():
/// print("formatted")
/// # fmt: off
/// (
/// not_formatted + b
/// )
/// # fmt: on
/// ```
///
/// Gets formatted as
///
/// ```python
/// def test():
/// print("formatted")
/// # fmt: off
/// (
/// not_formatted + b
/// )
/// # fmt: on
/// ```
///
/// Notice how the `not_formatted + b` expression statement gets the same indentation as the `print` statement above,
/// but the indentation of the expression remains unchanged. It changes the indentation to:
/// * Prevent syntax errors because of different indentation levels between formatted and suppressed statements.
/// * Align with the `fmt: skip` where statements are indented as well, but inner expressions are formatted as is.
struct FormatVerbatimStatementRange {
verbatim_range: TextRange,
indentation: Indentation,
}
impl Format<PyFormatContext<'_>> for FormatVerbatimStatementRange {
fn fmt(&self, f: &mut Formatter<PyFormatContext<'_>>) -> FormatResult<()> {
let lexer = lex_starts_at(
&f.context().source()[self.verbatim_range],
Mode::Module,
self.verbatim_range.start(),
);
let logical_lines = LogicalLinesIter::new(lexer, self.verbatim_range);
let mut first = true;
for logical_line in logical_lines {
let logical_line = logical_line?;
let trimmed_line_range = self
.indentation
.trim_indent(&logical_line, f.context().source());
// A line without any content, write an empty line, except for the first or last (indent only) line.
if trimmed_line_range.is_empty() {
if logical_line.has_trailing_newline {
if first {
hard_line_break().fmt(f)?;
} else {
empty_line().fmt(f)?;
}
}
} else {
// Non empty line, write the text of the line
verbatim_text(trimmed_line_range, logical_line.contains_newlines).fmt(f)?;
// Write the line separator that terminates the line, except if it is the last line (that isn't separated by a hard line break).
if logical_line.has_trailing_newline {
// Insert an empty line if the text is non-empty but all characters have a width of zero.
// This is necessary to work around the fact that the Printer omits hard line breaks if the line width is 0.
// The alternative is to "fix" the printer and explicitly track the width and whether the line is empty.
// There's currently no use case for zero-width content outside of the verbatim context (and, form feeds are a Python specific speciality).
// It, therefore, feels wrong to add additional complexity to the very hot `Printer::print_char` function,
// to work around this special case. Therefore, work around the Printer behavior here, in the cold verbatim-formatting.
if f.context().source()[trimmed_line_range].width() == 0 {
empty_line().fmt(f)?;
} else {
hard_line_break().fmt(f)?;
}
}
}
first = false;
}
Ok(())
}
}
struct LogicalLinesIter<I> {
lexer: I,
// The end of the last logical line
last_line_end: TextSize,
// The position where the content to lex ends.
content_end: TextSize,
}
impl<I> LogicalLinesIter<I> {
fn new(lexer: I, verbatim_range: TextRange) -> Self {
Self {
lexer,
last_line_end: verbatim_range.start(),
content_end: verbatim_range.end(),
}
}
}
impl<I> Iterator for LogicalLinesIter<I>
where
I: Iterator<Item = LexResult>,
{
type Item = FormatResult<LogicalLine>;
fn next(&mut self) -> Option<Self::Item> {
let mut parens = 0u32;
let mut contains_newlines = ContainsNewlines::No;
let (content_end, full_end) = loop {
match self.lexer.next() {
Some(Ok((token, range))) => match token {
Tok::Newline => break (range.start(), range.end()),
// Ignore if inside an expression
Tok::NonLogicalNewline if parens == 0 => break (range.start(), range.end()),
Tok::NonLogicalNewline => {
contains_newlines = ContainsNewlines::Yes;
}
Tok::Lbrace | Tok::Lpar | Tok::Lsqb => {
parens = parens.saturating_add(1);
}
Tok::Rbrace | Tok::Rpar | Tok::Rsqb => {
parens = parens.saturating_sub(1);
}
Tok::String { value, .. } if value.contains(['\n', '\r']) => {
contains_newlines = ContainsNewlines::Yes;
}
_ => {}
},
None => {
// Returns any content that comes after the last newline. This is mainly whitespace
// or characters that the `Lexer` skips, like a form-feed character.
return if self.last_line_end < self.content_end {
let content_start = self.last_line_end;
self.last_line_end = self.content_end;
Some(Ok(LogicalLine {
content_range: TextRange::new(content_start, self.content_end),
contains_newlines: ContainsNewlines::No,
has_trailing_newline: false,
}))
} else {
None
};
}
Some(Err(_)) => {
return Some(Err(FormatError::syntax_error(
"Unexpected token when lexing verbatim statement range.",
)))
}
}
};
let line_start = self.last_line_end;
self.last_line_end = full_end;
Some(Ok(LogicalLine {
content_range: TextRange::new(line_start, content_end),
contains_newlines,
has_trailing_newline: true,
}))
}
}
impl<I> FusedIterator for LogicalLinesIter<I> where I: Iterator<Item = LexResult> {}
/// A logical line or a comment (or form feed only) line
struct LogicalLine {
/// The range of this lines content (excluding the trailing newline)
content_range: TextRange,
/// Whether the content in `content_range` contains any newlines.
contains_newlines: ContainsNewlines,
/// Does this logical line have a trailing newline or does it just happen to be the last line.
has_trailing_newline: bool,
}
impl Ranged for LogicalLine {
fn range(&self) -> TextRange {
self.content_range
}
}
struct VerbatimText {
verbatim_range: TextRange,
contains_newlines: ContainsNewlines,
}
fn verbatim_text<T>(item: T, contains_newlines: ContainsNewlines) -> VerbatimText
where
T: Ranged,
{
VerbatimText(item.range())
VerbatimText {
verbatim_range: item.range(),
contains_newlines,
}
}
impl Format<PyFormatContext<'_>> for VerbatimText {
fn fmt(&self, f: &mut PyFormatter) -> FormatResult<()> {
f.write_element(FormatElement::Tag(Tag::StartVerbatim(
tag::VerbatimKind::Verbatim {
length: self.0.len(),
length: self.verbatim_range.len(),
},
)))?;
match normalize_newlines(f.context().locator().slice(self.0), ['\r']) {
match normalize_newlines(f.context().locator().slice(self.verbatim_range), ['\r']) {
Cow::Borrowed(_) => {
write!(f, [source_text_slice(self.0, ContainsNewlines::Detect)])?;
write!(
f,
[source_text_slice(
self.verbatim_range,
self.contains_newlines
)]
)?;
}
Cow::Owned(cleaned) => {
write!(
f,
[
dynamic_text(&cleaned, Some(self.0.start())),
source_position(self.0.end())
dynamic_text(&cleaned, Some(self.verbatim_range.start())),
source_position(self.verbatim_range.end())
]
)?;
}