react_auditor/rules/performance/
html_has_lang.rs

1use oxc_ast::ast::Program;
2use oxc_ast_visit::Visit;
3use oxc_semantic::Semantic;
4
5use crate::rules::{Rule, RuleFinding, RuleMeta, Severity};
6
7pub struct HtmlHasLang;
8
9const RULE_META: RuleMeta = RuleMeta {
10    id: "html-has-lang",
11    default_severity: Severity::Error,
12    category: "accessibility",
13    description: "<html> element must have a lang attribute",
14};
15
16impl Rule for HtmlHasLang {
17    fn meta(&self) -> &RuleMeta {
18        &RULE_META
19    }
20
21    fn run(&self, program: &Program, _semantic: &Semantic, source_text: &str) -> Vec<RuleFinding> {
22        let mut collector = HtmlLangCollector {
23            findings: Vec::new(),
24            source: source_text,
25        };
26        collector.visit_program(program);
27        collector.findings
28    }
29}
30
31struct HtmlLangCollector<'a> {
32    findings: Vec<RuleFinding>,
33    source: &'a str,
34}
35
36impl<'a> Visit<'a> for HtmlLangCollector<'a> {
37    fn visit_jsx_opening_element(&mut self, el: &oxc_ast::ast::JSXOpeningElement<'a>) {
38        let is_html = matches!(&el.name, oxc_ast::ast::JSXElementName::Identifier(id) if id.name.as_str() == "html");
39        if !is_html {
40            return;
41        }
42        let has_lang = el.attributes.iter().any(|attr| {
43            if let oxc_ast::ast::JSXAttributeItem::Attribute(a) = attr {
44                matches!(&a.name, oxc_ast::ast::JSXAttributeName::Identifier(id) if id.name.as_str() == "lang")
45            } else {
46                false
47            }
48        });
49        if !has_lang {
50            let start = el.span.start as usize;
51            let line = self.source[..start].lines().count().max(1);
52            let col = start - self.source[..start].rfind('\n').map(|i| i + 1).unwrap_or(0);
53            self.findings.push(RuleFinding {
54                line,
55                column: col + 1,
56                message: "<html> element is missing the lang attribute".to_string(),
57            });
58        }
59    }
60}
react_auditor/rules/performance/html_has_lang.rs

react_auditor/rules/performance/
html_has_lang.rs
