/
parser.rs
389 lines (356 loc) · 12.6 KB
/
parser.rs
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use std::str::FromStr;
use anyhow::{bail, Result};
use once_cell::sync::Lazy;
use regex::Regex;
use ruff::registry::{CheckCodePrefix, PREFIX_REDIRECTS};
use ruff::settings::types::PatternPrefixPair;
use rustc_hash::FxHashMap;
static COMMA_SEPARATED_LIST_RE: Lazy<Regex> = Lazy::new(|| Regex::new(r"[,\s]").unwrap());
/// Parse a comma-separated list of `CheckCodePrefix` values (e.g.,
/// "F401,E501").
pub fn parse_prefix_codes(value: &str) -> Vec<CheckCodePrefix> {
let mut codes: Vec<CheckCodePrefix> = vec![];
for code in COMMA_SEPARATED_LIST_RE.split(value) {
let code = code.trim();
if code.is_empty() {
continue;
}
if let Some(code) = PREFIX_REDIRECTS.get(code) {
codes.push(code.clone());
} else if let Ok(code) = CheckCodePrefix::from_str(code) {
codes.push(code);
} else {
eprintln!("Unsupported prefix code: {code}");
}
}
codes
}
/// Parse a comma-separated list of strings (e.g., "__init__.py,__main__.py").
pub fn parse_strings(value: &str) -> Vec<String> {
COMMA_SEPARATED_LIST_RE
.split(value)
.map(str::trim)
.filter(|part| !part.is_empty())
.map(String::from)
.collect()
}
/// Parse a boolean.
pub fn parse_bool(value: &str) -> Result<bool> {
match value.trim() {
"true" => Ok(true),
"false" => Ok(false),
_ => bail!("Unexpected boolean value: {value}"),
}
}
#[derive(Debug)]
struct Token {
token_name: TokenType,
src: String,
}
#[derive(Debug)]
enum TokenType {
Code,
File,
Colon,
Comma,
Ws,
Eof,
}
struct State {
seen_sep: bool,
seen_colon: bool,
filenames: Vec<String>,
codes: Vec<String>,
}
impl State {
fn new() -> Self {
Self {
seen_sep: true,
seen_colon: false,
filenames: vec![],
codes: vec![],
}
}
/// Generate the list of `StrCheckCodePair` pairs for the current state.
fn parse(&self) -> Vec<PatternPrefixPair> {
let mut codes: Vec<PatternPrefixPair> = vec![];
for code in &self.codes {
if let Some(code) = PREFIX_REDIRECTS.get(code.as_str()) {
for filename in &self.filenames {
codes.push(PatternPrefixPair {
pattern: filename.clone(),
prefix: code.clone(),
});
}
} else if let Ok(code) = CheckCodePrefix::from_str(code) {
for filename in &self.filenames {
codes.push(PatternPrefixPair {
pattern: filename.clone(),
prefix: code.clone(),
});
}
} else {
eprintln!("Unsupported prefix code: {code}");
}
}
codes
}
}
/// Tokenize the raw 'files-to-codes' mapping.
fn tokenize_files_to_codes_mapping(value: &str) -> Vec<Token> {
let mut tokens = vec![];
let mut i = 0;
while i < value.len() {
for (token_re, token_name) in [
(
Regex::new(r"([A-Z]+[0-9]*)(?:$|\s|,)").unwrap(),
TokenType::Code,
),
(Regex::new(r"([^\s:,]+)").unwrap(), TokenType::File),
(Regex::new(r"(\s*:\s*)").unwrap(), TokenType::Colon),
(Regex::new(r"(\s*,\s*)").unwrap(), TokenType::Comma),
(Regex::new(r"(\s+)").unwrap(), TokenType::Ws),
] {
if let Some(cap) = token_re.captures(&value[i..]) {
let mat = cap.get(1).unwrap();
if mat.start() == 0 {
tokens.push(Token {
token_name,
src: mat.as_str().trim().to_string(),
});
i += mat.end();
break;
}
}
}
}
tokens.push(Token {
token_name: TokenType::Eof,
src: String::new(),
});
tokens
}
/// Parse a 'files-to-codes' mapping, mimicking Flake8's internal logic.
/// See: <https://github.com/PyCQA/flake8/blob/7dfe99616fc2f07c0017df2ba5fa884158f3ea8a/src/flake8/utils.py#L45>
pub fn parse_files_to_codes_mapping(value: &str) -> Result<Vec<PatternPrefixPair>> {
if value.trim().is_empty() {
return Ok(vec![]);
}
let mut codes: Vec<PatternPrefixPair> = vec![];
let mut state = State::new();
for token in tokenize_files_to_codes_mapping(value) {
if matches!(token.token_name, TokenType::Comma | TokenType::Ws) {
state.seen_sep = true;
} else if !state.seen_colon {
if matches!(token.token_name, TokenType::Colon) {
state.seen_colon = true;
state.seen_sep = true;
} else if state.seen_sep && matches!(token.token_name, TokenType::File) {
state.filenames.push(token.src);
state.seen_sep = false;
} else {
bail!("Unexpected token: {:?}", token.token_name);
}
} else {
if matches!(token.token_name, TokenType::Eof) {
codes.extend(state.parse());
state = State::new();
} else if state.seen_sep && matches!(token.token_name, TokenType::Code) {
state.codes.push(token.src);
state.seen_sep = false;
} else if state.seen_sep && matches!(token.token_name, TokenType::File) {
codes.extend(state.parse());
state = State::new();
state.filenames.push(token.src);
state.seen_sep = false;
} else {
bail!("Unexpected token: {:?}", token.token_name);
}
}
}
Ok(codes)
}
/// Collect a list of `PatternPrefixPair` structs as a `BTreeMap`.
pub fn collect_per_file_ignores(
pairs: Vec<PatternPrefixPair>,
) -> FxHashMap<String, Vec<CheckCodePrefix>> {
let mut per_file_ignores: FxHashMap<String, Vec<CheckCodePrefix>> = FxHashMap::default();
for pair in pairs {
per_file_ignores
.entry(pair.pattern)
.or_insert_with(Vec::new)
.push(pair.prefix);
}
per_file_ignores
}
#[cfg(test)]
mod tests {
use anyhow::Result;
use ruff::registry::CheckCodePrefix;
use ruff::settings::types::PatternPrefixPair;
use crate::parser::{parse_files_to_codes_mapping, parse_prefix_codes, parse_strings};
#[test]
fn it_parses_prefix_codes() {
let actual = parse_prefix_codes("");
let expected: Vec<CheckCodePrefix> = vec![];
assert_eq!(actual, expected);
let actual = parse_prefix_codes(" ");
let expected: Vec<CheckCodePrefix> = vec![];
assert_eq!(actual, expected);
let actual = parse_prefix_codes("F401");
let expected = vec![CheckCodePrefix::F401];
assert_eq!(actual, expected);
let actual = parse_prefix_codes("F401,");
let expected = vec![CheckCodePrefix::F401];
assert_eq!(actual, expected);
let actual = parse_prefix_codes("F401,E501");
let expected = vec![CheckCodePrefix::F401, CheckCodePrefix::E501];
assert_eq!(actual, expected);
let actual = parse_prefix_codes("F401, E501");
let expected = vec![CheckCodePrefix::F401, CheckCodePrefix::E501];
assert_eq!(actual, expected);
}
#[test]
fn it_parses_strings() {
let actual = parse_strings("");
let expected: Vec<String> = vec![];
assert_eq!(actual, expected);
let actual = parse_strings(" ");
let expected: Vec<String> = vec![];
assert_eq!(actual, expected);
let actual = parse_strings("__init__.py");
let expected = vec!["__init__.py".to_string()];
assert_eq!(actual, expected);
let actual = parse_strings("__init__.py,");
let expected = vec!["__init__.py".to_string()];
assert_eq!(actual, expected);
let actual = parse_strings("__init__.py,__main__.py");
let expected = vec!["__init__.py".to_string(), "__main__.py".to_string()];
assert_eq!(actual, expected);
let actual = parse_strings("__init__.py, __main__.py");
let expected = vec!["__init__.py".to_string(), "__main__.py".to_string()];
assert_eq!(actual, expected);
}
#[test]
fn it_parse_files_to_codes_mapping() -> Result<()> {
let actual = parse_files_to_codes_mapping("")?;
let expected: Vec<PatternPrefixPair> = vec![];
assert_eq!(actual, expected);
let actual = parse_files_to_codes_mapping(" ")?;
let expected: Vec<PatternPrefixPair> = vec![];
assert_eq!(actual, expected);
// Ex) locust
let actual = parse_files_to_codes_mapping(
"per-file-ignores =
locust/test/*: F841
examples/*: F841
*.pyi: E302,E704"
.strip_prefix("per-file-ignores =")
.unwrap(),
)?;
let expected: Vec<PatternPrefixPair> = vec![
PatternPrefixPair {
pattern: "locust/test/*".to_string(),
prefix: CheckCodePrefix::F841,
},
PatternPrefixPair {
pattern: "examples/*".to_string(),
prefix: CheckCodePrefix::F841,
},
];
assert_eq!(actual, expected);
// Ex) celery
let actual = parse_files_to_codes_mapping(
"per-file-ignores =
t/*,setup.py,examples/*,docs/*,extra/*:
D,"
.strip_prefix("per-file-ignores =")
.unwrap(),
)?;
let expected: Vec<PatternPrefixPair> = vec![
PatternPrefixPair {
pattern: "t/*".to_string(),
prefix: CheckCodePrefix::D,
},
PatternPrefixPair {
pattern: "setup.py".to_string(),
prefix: CheckCodePrefix::D,
},
PatternPrefixPair {
pattern: "examples/*".to_string(),
prefix: CheckCodePrefix::D,
},
PatternPrefixPair {
pattern: "docs/*".to_string(),
prefix: CheckCodePrefix::D,
},
PatternPrefixPair {
pattern: "extra/*".to_string(),
prefix: CheckCodePrefix::D,
},
];
assert_eq!(actual, expected);
// Ex) scrapy
let actual = parse_files_to_codes_mapping(
"per-file-ignores =
scrapy/__init__.py:E402
scrapy/core/downloader/handlers/http.py:F401
scrapy/http/__init__.py:F401
scrapy/linkextractors/__init__.py:E402,F401
scrapy/selector/__init__.py:F401
scrapy/spiders/__init__.py:E402,F401
scrapy/utils/url.py:F403,F405
tests/test_loader.py:E741"
.strip_prefix("per-file-ignores =")
.unwrap(),
)?;
let expected: Vec<PatternPrefixPair> = vec![
PatternPrefixPair {
pattern: "scrapy/__init__.py".to_string(),
prefix: CheckCodePrefix::E402,
},
PatternPrefixPair {
pattern: "scrapy/core/downloader/handlers/http.py".to_string(),
prefix: CheckCodePrefix::F401,
},
PatternPrefixPair {
pattern: "scrapy/http/__init__.py".to_string(),
prefix: CheckCodePrefix::F401,
},
PatternPrefixPair {
pattern: "scrapy/linkextractors/__init__.py".to_string(),
prefix: CheckCodePrefix::E402,
},
PatternPrefixPair {
pattern: "scrapy/linkextractors/__init__.py".to_string(),
prefix: CheckCodePrefix::F401,
},
PatternPrefixPair {
pattern: "scrapy/selector/__init__.py".to_string(),
prefix: CheckCodePrefix::F401,
},
PatternPrefixPair {
pattern: "scrapy/spiders/__init__.py".to_string(),
prefix: CheckCodePrefix::E402,
},
PatternPrefixPair {
pattern: "scrapy/spiders/__init__.py".to_string(),
prefix: CheckCodePrefix::F401,
},
PatternPrefixPair {
pattern: "scrapy/utils/url.py".to_string(),
prefix: CheckCodePrefix::F403,
},
PatternPrefixPair {
pattern: "scrapy/utils/url.py".to_string(),
prefix: CheckCodePrefix::F405,
},
PatternPrefixPair {
pattern: "tests/test_loader.py".to_string(),
prefix: CheckCodePrefix::E741,
},
];
assert_eq!(actual, expected);
Ok(())
}
}