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diagnostics.rs
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diagnostics.rs
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#![cfg_attr(target_family = "wasm", allow(dead_code))]
use std::fs::{write, File};
use std::io;
use std::io::{BufWriter, Write};
use std::ops::AddAssign;
#[cfg(unix)]
use std::os::unix::fs::PermissionsExt;
use std::path::Path;
use anyhow::{Context, Result};
use colored::Colorize;
use filetime::FileTime;
use log::{debug, error, warn};
use rustc_hash::FxHashMap;
use similar::TextDiff;
use ruff_diagnostics::Diagnostic;
use ruff_linter::linter::{lint_fix, lint_only, FixTable, FixerResult, LinterResult};
use ruff_linter::logging::DisplayParseError;
use ruff_linter::message::Message;
use ruff_linter::pyproject_toml::lint_pyproject_toml;
use ruff_linter::registry::AsRule;
use ruff_linter::settings::{flags, LinterSettings};
use ruff_linter::source_kind::{SourceError, SourceKind};
use ruff_linter::{fs, IOError, SyntaxError};
use ruff_macros::CacheKey;
use ruff_notebook::{Cell, Notebook, NotebookError, NotebookIndex};
use ruff_python_ast::imports::ImportMap;
use ruff_python_ast::{SourceType, TomlSourceType};
use ruff_source_file::{LineIndex, SourceCode, SourceFileBuilder};
use ruff_text_size::{TextRange, TextSize};
use ruff_workspace::Settings;
use crate::cache::Cache;
#[derive(CacheKey)]
pub(crate) struct FileCacheKey {
/// Timestamp when the file was last modified before the (cached) check.
file_last_modified: FileTime,
/// Permissions of the file before the (cached) check.
file_permissions_mode: u32,
}
impl FileCacheKey {
fn from_path(path: &Path) -> io::Result<FileCacheKey> {
// Construct a cache key for the file
let metadata = path.metadata()?;
#[cfg(unix)]
let permissions = metadata.permissions().mode();
#[cfg(windows)]
let permissions: u32 = metadata.permissions().readonly().into();
Ok(FileCacheKey {
file_last_modified: FileTime::from_last_modification_time(&metadata),
file_permissions_mode: permissions,
})
}
}
#[derive(Debug, Default, PartialEq)]
pub(crate) struct Diagnostics {
pub(crate) messages: Vec<Message>,
pub(crate) fixed: FxHashMap<String, FixTable>,
pub(crate) imports: ImportMap,
pub(crate) notebook_indexes: FxHashMap<String, NotebookIndex>,
}
impl Diagnostics {
pub(crate) fn new(
messages: Vec<Message>,
imports: ImportMap,
notebook_indexes: FxHashMap<String, NotebookIndex>,
) -> Self {
Self {
messages,
fixed: FxHashMap::default(),
imports,
notebook_indexes,
}
}
/// Generate [`Diagnostics`] based on a [`SourceError`].
pub(crate) fn from_source_error(
err: &SourceError,
path: Option<&Path>,
settings: &LinterSettings,
) -> Self {
let diagnostic = match err {
// IO errors.
SourceError::Io(_)
| SourceError::Notebook(NotebookError::Io(_) | NotebookError::Json(_)) => {
Diagnostic::new(
IOError {
message: err.to_string(),
},
TextRange::default(),
)
}
// Syntax errors.
SourceError::Notebook(
NotebookError::InvalidJson(_)
| NotebookError::InvalidSchema(_)
| NotebookError::InvalidFormat(_),
) => Diagnostic::new(
SyntaxError {
message: err.to_string(),
},
TextRange::default(),
),
};
if settings.rules.enabled(diagnostic.kind.rule()) {
let name = path.map_or_else(|| "-".into(), Path::to_string_lossy);
let dummy = SourceFileBuilder::new(name, "").finish();
Self::new(
vec![Message::from_diagnostic(
diagnostic,
dummy,
TextSize::default(),
)],
ImportMap::default(),
FxHashMap::default(),
)
} else {
match path {
Some(path) => {
warn!(
"{}{}{} {err}",
"Failed to lint ".bold(),
fs::relativize_path(path).bold(),
":".bold()
);
}
None => {
warn!("{}{} {err}", "Failed to lint".bold(), ":".bold());
}
}
Self::default()
}
}
}
impl AddAssign for Diagnostics {
fn add_assign(&mut self, other: Self) {
self.messages.extend(other.messages);
self.imports.extend(other.imports);
for (filename, fixed) in other.fixed {
if fixed.is_empty() {
continue;
}
let fixed_in_file = self.fixed.entry(filename).or_default();
for (rule, count) in fixed {
if count > 0 {
*fixed_in_file.entry(rule).or_default() += count;
}
}
}
self.notebook_indexes.extend(other.notebook_indexes);
}
}
/// Lint the source code at the given `Path`.
pub(crate) fn lint_path(
path: &Path,
package: Option<&Path>,
settings: &LinterSettings,
cache: Option<&Cache>,
noqa: flags::Noqa,
fix_mode: flags::FixMode,
) -> Result<Diagnostics> {
// Check the cache.
// TODO(charlie): `fixer::Mode::Apply` and `fixer::Mode::Diff` both have
// side-effects that aren't captured in the cache. (In practice, it's fine
// to cache `fixer::Mode::Apply`, since a file either has no fixes, or we'll
// write the fixes to disk, thus invalidating the cache. But it's a bit hard
// to reason about. We need to come up with a better solution here.)
let caching = match cache {
Some(cache) if noqa.into() && fix_mode.is_generate() => {
let relative_path = cache
.relative_path(path)
.expect("wrong package cache for file");
let cache_key = FileCacheKey::from_path(path).context("Failed to create cache key")?;
if let Some(cache) = cache.get(relative_path, &cache_key) {
return Ok(cache.as_diagnostics(path));
}
// Stash the file metadata for later so when we update the cache it reflects the prerun
// information
Some((cache, relative_path, cache_key))
}
_ => None,
};
debug!("Checking: {}", path.display());
let source_type = match SourceType::from(path) {
SourceType::Toml(TomlSourceType::Pyproject) => {
let messages = if settings
.rules
.iter_enabled()
.any(|rule_code| rule_code.lint_source().is_pyproject_toml())
{
let contents = match std::fs::read_to_string(path).map_err(SourceError::from) {
Ok(contents) => contents,
Err(err) => {
return Ok(Diagnostics::from_source_error(&err, Some(path), settings));
}
};
let source_file = SourceFileBuilder::new(path.to_string_lossy(), contents).finish();
lint_pyproject_toml(source_file, settings)
} else {
vec![]
};
return Ok(Diagnostics {
messages,
..Diagnostics::default()
});
}
SourceType::Toml(_) => return Ok(Diagnostics::default()),
SourceType::Python(source_type) => source_type,
};
// Extract the sources from the file.
let source_kind = match SourceKind::from_path(path, source_type) {
Ok(Some(source_kind)) => source_kind,
Ok(None) => return Ok(Diagnostics::default()),
Err(err) => {
return Ok(Diagnostics::from_source_error(&err, Some(path), settings));
}
};
// Lint the file.
let (
LinterResult {
data: (messages, imports),
error: parse_error,
},
fixed,
) = if matches!(fix_mode, flags::FixMode::Apply | flags::FixMode::Diff) {
if let Ok(FixerResult {
result,
transformed,
fixed,
}) = lint_fix(path, package, noqa, settings, &source_kind, source_type)
{
if !fixed.is_empty() {
match fix_mode {
flags::FixMode::Apply => match transformed.as_ref() {
SourceKind::Python(transformed) => {
write(path, transformed.as_bytes())?;
}
SourceKind::IpyNotebook(notebook) => {
let mut writer = BufWriter::new(File::create(path)?);
notebook.write(&mut writer)?;
}
},
flags::FixMode::Diff => {
match transformed.as_ref() {
SourceKind::Python(transformed) => {
let mut stdout = io::stdout().lock();
TextDiff::from_lines(source_kind.source_code(), transformed)
.unified_diff()
.header(&fs::relativize_path(path), &fs::relativize_path(path))
.to_writer(&mut stdout)?;
stdout.write_all(b"\n")?;
stdout.flush()?;
}
SourceKind::IpyNotebook(dest_notebook) => {
// We need to load the notebook again, since we might've
// mutated it.
let src_notebook = source_kind.as_ipy_notebook().unwrap();
let mut stdout = io::stdout().lock();
// Cell indices are 1-based.
for ((idx, src_cell), dest_cell) in (1u32..)
.zip(src_notebook.cells().iter())
.zip(dest_notebook.cells().iter())
{
let (Cell::Code(src_code_cell), Cell::Code(dest_code_cell)) =
(src_cell, dest_cell)
else {
continue;
};
TextDiff::from_lines(
&src_code_cell.source.to_string(),
&dest_code_cell.source.to_string(),
)
.unified_diff()
// Jupyter notebook cells don't necessarily have a newline
// at the end. For example,
//
// ```python
// print("hello")
// ```
//
// For a cell containing the above code, there'll only be one line,
// and it won't have a newline at the end. If it did, there'd be
// two lines, and the second line would be empty:
//
// ```python
// print("hello")
//
// ```
.missing_newline_hint(false)
.header(
&format!("{}:cell {}", &fs::relativize_path(path), idx),
&format!("{}:cell {}", &fs::relativize_path(path), idx),
)
.to_writer(&mut stdout)?;
}
stdout.write_all(b"\n")?;
stdout.flush()?;
}
}
}
flags::FixMode::Generate => {}
}
}
(result, fixed)
} else {
// If we fail to fix, lint the original source code.
let result = lint_only(path, package, settings, noqa, &source_kind, source_type);
let fixed = FxHashMap::default();
(result, fixed)
}
} else {
let result = lint_only(path, package, settings, noqa, &source_kind, source_type);
let fixed = FxHashMap::default();
(result, fixed)
};
let imports = imports.unwrap_or_default();
if let Some((cache, relative_path, key)) = caching {
// We don't cache parsing errors.
if parse_error.is_none() {
cache.update(
relative_path.to_owned(),
key,
&messages,
&imports,
source_kind.as_ipy_notebook().map(Notebook::index),
);
}
}
if let Some(err) = parse_error {
error!(
"{}",
DisplayParseError::new(
err,
SourceCode::new(
source_kind.source_code(),
&LineIndex::from_source_text(source_kind.source_code())
),
&source_kind,
)
);
}
let notebook_indexes = if let SourceKind::IpyNotebook(notebook) = source_kind {
FxHashMap::from_iter([(path.to_string_lossy().to_string(), notebook.into_index())])
} else {
FxHashMap::default()
};
Ok(Diagnostics {
messages,
fixed: FxHashMap::from_iter([(fs::relativize_path(path), fixed)]),
imports,
notebook_indexes,
})
}
/// Generate `Diagnostic`s from source code content derived from
/// stdin.
pub(crate) fn lint_stdin(
path: Option<&Path>,
package: Option<&Path>,
contents: String,
settings: &Settings,
noqa: flags::Noqa,
fix_mode: flags::FixMode,
) -> Result<Diagnostics> {
// TODO(charlie): Support `pyproject.toml`.
let SourceType::Python(source_type) = path.map(SourceType::from).unwrap_or_default() else {
return Ok(Diagnostics::default());
};
// Extract the sources from the file.
let source_kind = match SourceKind::from_source_code(contents, source_type) {
Ok(Some(source_kind)) => source_kind,
Ok(None) => return Ok(Diagnostics::default()),
Err(err) => {
return Ok(Diagnostics::from_source_error(&err, path, &settings.linter));
}
};
// Lint the inputs.
let (
LinterResult {
data: (messages, imports),
error: parse_error,
},
fixed,
) = if matches!(fix_mode, flags::FixMode::Apply | flags::FixMode::Diff) {
if let Ok(FixerResult {
result,
transformed,
fixed,
}) = lint_fix(
path.unwrap_or_else(|| Path::new("-")),
package,
noqa,
&settings.linter,
&source_kind,
source_type,
) {
match fix_mode {
flags::FixMode::Apply => {
// Write the contents to stdout, regardless of whether any errors were fixed.
transformed.write(&mut io::stdout().lock())?;
}
flags::FixMode::Diff => {
// But only write a diff if it's non-empty.
if !fixed.is_empty() {
let text_diff = TextDiff::from_lines(
source_kind.source_code(),
transformed.source_code(),
);
let mut unified_diff = text_diff.unified_diff();
if let Some(path) = path {
unified_diff
.header(&fs::relativize_path(path), &fs::relativize_path(path));
}
let mut stdout = io::stdout().lock();
unified_diff.to_writer(&mut stdout)?;
stdout.write_all(b"\n")?;
stdout.flush()?;
}
}
flags::FixMode::Generate => {}
}
(result, fixed)
} else {
// If we fail to fix, lint the original source code.
let result = lint_only(
path.unwrap_or_else(|| Path::new("-")),
package,
&settings.linter,
noqa,
&source_kind,
source_type,
);
let fixed = FxHashMap::default();
// Write the contents to stdout anyway.
if fix_mode.is_apply() {
source_kind.write(&mut io::stdout().lock())?;
}
(result, fixed)
}
} else {
let result = lint_only(
path.unwrap_or_else(|| Path::new("-")),
package,
&settings.linter,
noqa,
&source_kind,
source_type,
);
let fixed = FxHashMap::default();
(result, fixed)
};
let imports = imports.unwrap_or_default();
if let Some(err) = parse_error {
error!(
"Failed to parse {}: {err}",
path.map_or_else(|| "-".into(), fs::relativize_path).bold()
);
}
let notebook_indexes = if let SourceKind::IpyNotebook(notebook) = source_kind {
FxHashMap::from_iter([(
path.map_or_else(|| "-".into(), |path| path.to_string_lossy().to_string()),
notebook.into_index(),
)])
} else {
FxHashMap::default()
};
Ok(Diagnostics {
messages,
fixed: FxHashMap::from_iter([(
fs::relativize_path(path.unwrap_or_else(|| Path::new("-"))),
fixed,
)]),
imports,
notebook_indexes,
})
}