114 lines
4.4 KiB
Rust
114 lines
4.4 KiB
Rust
use clippy_utils::diagnostics::span_lint;
|
|
use rustc_ast::ast;
|
|
use rustc_data_structures::fx::FxHashSet;
|
|
use rustc_lint::{EarlyContext, EarlyLintPass, Level, LintContext};
|
|
use rustc_session::{declare_tool_lint, impl_lint_pass};
|
|
use unicode_script::{Script, UnicodeScript};
|
|
|
|
declare_clippy_lint! {
|
|
/// ### What it does
|
|
/// Checks for usage of unicode scripts other than those explicitly allowed
|
|
/// by the lint config.
|
|
///
|
|
/// This lint doesn't take into account non-text scripts such as `Unknown` and `Linear_A`.
|
|
/// It also ignores the `Common` script type.
|
|
/// While configuring, be sure to use official script name [aliases] from
|
|
/// [the list of supported scripts][supported_scripts].
|
|
///
|
|
/// See also: [`non_ascii_idents`].
|
|
///
|
|
/// [aliases]: http://www.unicode.org/reports/tr24/tr24-31.html#Script_Value_Aliases
|
|
/// [supported_scripts]: https://www.unicode.org/iso15924/iso15924-codes.html
|
|
///
|
|
/// ### Why is this bad?
|
|
/// It may be not desired to have many different scripts for
|
|
/// identifiers in the codebase.
|
|
///
|
|
/// Note that if you only want to allow plain English, you might want to use
|
|
/// built-in [`non_ascii_idents`] lint instead.
|
|
///
|
|
/// [`non_ascii_idents`]: https://doc.rust-lang.org/rustc/lints/listing/allowed-by-default.html#non-ascii-idents
|
|
///
|
|
/// ### Example
|
|
/// ```rust
|
|
/// // Assuming that `clippy.toml` contains the following line:
|
|
/// // allowed-locales = ["Latin", "Cyrillic"]
|
|
/// let counter = 10; // OK, latin is allowed.
|
|
/// let счётчик = 10; // OK, cyrillic is allowed.
|
|
/// let zähler = 10; // OK, it's still latin.
|
|
/// let カウンタ = 10; // Will spawn the lint.
|
|
/// ```
|
|
#[clippy::version = "1.55.0"]
|
|
pub DISALLOWED_SCRIPT_IDENTS,
|
|
restriction,
|
|
"usage of non-allowed Unicode scripts"
|
|
}
|
|
|
|
#[derive(Clone, Debug)]
|
|
pub struct DisallowedScriptIdents {
|
|
whitelist: FxHashSet<Script>,
|
|
}
|
|
|
|
impl DisallowedScriptIdents {
|
|
pub fn new(whitelist: &[String]) -> Self {
|
|
let whitelist = whitelist
|
|
.iter()
|
|
.map(String::as_str)
|
|
.filter_map(Script::from_full_name)
|
|
.collect();
|
|
Self { whitelist }
|
|
}
|
|
}
|
|
|
|
impl_lint_pass!(DisallowedScriptIdents => [DISALLOWED_SCRIPT_IDENTS]);
|
|
|
|
impl EarlyLintPass for DisallowedScriptIdents {
|
|
fn check_crate(&mut self, cx: &EarlyContext<'_>, _: &ast::Crate) {
|
|
// Implementation is heavily inspired by the implementation of [`non_ascii_idents`] lint:
|
|
// https://github.com/rust-lang/rust/blob/master/compiler/rustc_lint/src/non_ascii_idents.rs
|
|
|
|
let check_disallowed_script_idents = cx.builder.lint_level(DISALLOWED_SCRIPT_IDENTS).0 != Level::Allow;
|
|
if !check_disallowed_script_idents {
|
|
return;
|
|
}
|
|
|
|
let symbols = cx.sess().parse_sess.symbol_gallery.symbols.lock();
|
|
// Sort by `Span` so that error messages make sense with respect to the
|
|
// order of identifier locations in the code.
|
|
let mut symbols: Vec<_> = symbols.iter().collect();
|
|
symbols.sort_unstable_by_key(|k| k.1);
|
|
|
|
for (symbol, &span) in &symbols {
|
|
// Note: `symbol.as_str()` is an expensive operation, thus should not be called
|
|
// more than once for a single symbol.
|
|
let symbol_str = symbol.as_str();
|
|
if symbol_str.is_ascii() {
|
|
continue;
|
|
}
|
|
|
|
for c in symbol_str.chars() {
|
|
// We want to iterate through all the scripts associated with this character
|
|
// and check whether at least of one scripts is in the whitelist.
|
|
let forbidden_script = c
|
|
.script_extension()
|
|
.iter()
|
|
.find(|script| !self.whitelist.contains(script));
|
|
if let Some(script) = forbidden_script {
|
|
span_lint(
|
|
cx,
|
|
DISALLOWED_SCRIPT_IDENTS,
|
|
span,
|
|
&format!(
|
|
"identifier `{}` has a Unicode script that is not allowed by configuration: {}",
|
|
symbol_str,
|
|
script.full_name()
|
|
),
|
|
);
|
|
// We don't want to spawn warning multiple times over a single identifier.
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|