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use super::Context;
use super::LintRule;
use swc_ecmascript::ast::Number;
use swc_ecmascript::visit::Node;
use swc_ecmascript::visit::Visit;
use std::sync::Arc;
pub struct NoOctal;
impl LintRule for NoOctal {
fn new() -> Box<Self> {
Box::new(NoOctal)
}
fn code(&self) -> &'static str {
"no-octal"
}
fn lint_module(
&self,
context: Arc<Context>,
module: &swc_ecmascript::ast::Module,
) {
let mut visitor = NoOctalVisitor::new(context);
visitor.visit_module(module, module);
}
}
struct NoOctalVisitor {
context: Arc<Context>,
}
impl NoOctalVisitor {
pub fn new(context: Arc<Context>) -> Self {
Self { context }
}
}
impl Visit for NoOctalVisitor {
fn visit_number(&mut self, literal_num: &Number, _parent: &dyn Node) {
lazy_static! {
static ref OCTAL: regex::Regex = regex::Regex::new(r"^0[0-9]").unwrap();
}
let raw_number = self
.context
.source_map
.span_to_snippet(literal_num.span)
.expect("error in loading snippet");
if OCTAL.is_match(&raw_number) {
self.context.add_diagnostic(
literal_num.span,
"no-octal",
"`Octal number` is not allowed",
);
}
}
}
#[cfg(test)]
mod tests {
use super::*;
use crate::test_util::*;
#[test]
fn test_literal_octal() {
assert_lint_err::<NoOctal>("07", 0);
}
#[test]
fn test_operand_octal() {
assert_lint_err::<NoOctal>("let x = 7 + 07", 12);
}
#[test]
fn test_octals_valid() {
assert_lint_ok_n::<NoOctal>(vec!["7", "\"07\"", "0x08", "-0.01"]);
}
}