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linter.rs
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linter.rs
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//! The simplest linter
use std::{env, path::Path};
use oxc_allocator::Allocator;
use oxc_ast::{AstKind, SourceType, Span};
use oxc_diagnostics::{
miette::{self, Diagnostic},
thiserror::Error,
};
use oxc_parser::Parser;
use oxc_semantic::SemanticBuilder;
// Instruction:
// create a `test.js`,
// run `cargo run -p oxc_linter --example linter`
// or `cargo watch -x "run -p oxc_linter --example linter"`
fn main() {
let name = env::args().nth(1).unwrap_or_else(|| "test.js".to_string());
let path = Path::new(&name);
let source_text = std::fs::read_to_string(path).unwrap_or_else(|_| panic!("{name} not found"));
let allocator = Allocator::default();
let source_type = SourceType::from_path(path).unwrap();
let ret = Parser::new(&allocator, &source_text, source_type).parse();
// Handle parser errors
if !ret.errors.is_empty() {
print_errors(&source_text, ret.errors);
return;
}
let program = allocator.alloc(ret.program);
let semantic_ret = SemanticBuilder::new(&source_text, source_type, &ret.trivias).build(program);
let mut errors: Vec<oxc_diagnostics::Error> = vec![];
for node in semantic_ret.semantic.nodes().iter() {
match node.get().kind() {
AstKind::DebuggerStatement(stmt) => {
errors.push(NoDebugger(stmt.span).into());
}
AstKind::ArrayPattern(array) if array.elements.is_empty() => {
errors.push(NoEmptyPattern("array", array.span).into());
}
AstKind::ObjectPattern(object) if object.properties.is_empty() => {
errors.push(NoEmptyPattern("object", object.span).into());
}
_ => {}
}
}
if !errors.is_empty() {
print_errors(&source_text, errors);
return;
}
println!("Success!");
}
fn print_errors(source_text: &str, errors: Vec<oxc_diagnostics::Error>) {
for error in errors {
let error = error.with_source_code(source_text.to_string());
println!("{error:?}");
}
}
// This prints:
//
// ⚠ `debugger` statement is not allowed
// ╭────
// 1 │ debugger;
// · ─────────
// ╰────
#[derive(Debug, Error, Diagnostic)]
#[error("`debugger` statement is not allowed")]
#[diagnostic(severity(warning))]
struct NoDebugger(#[label] pub Span);
// This prints:
//
// ⚠ empty destructuring pattern is not allowed
// ╭────
// 1 │ let {} = {};
// · ─┬
// · ╰── Empty object binding pattern
// ╰────
#[derive(Debug, Error, Diagnostic)]
#[error("empty destructuring pattern is not allowed")]
#[diagnostic(severity(warning))]
struct NoEmptyPattern(&'static str, #[label("Empty {0} binding pattern")] pub Span);