use oxc_ast::ast::Program;
use oxc_ast_visit::Visit;
use oxc_semantic::Semantic;
use crate::rules::{Rule, RuleFinding, RuleMeta, Severity};
pub struct HtmlHasLang;
const RULE_META: RuleMeta = RuleMeta {
id: "html-has-lang",
default_severity: Severity::Error,
category: "accessibility",
description: "<html> element must have a lang attribute",
};
impl Rule for HtmlHasLang {
fn meta(&self) -> &RuleMeta {
&RULE_META
}
fn run(&self, program: &Program, _semantic: &Semantic, source_text: &str) -> Vec<RuleFinding> {
let mut collector = HtmlLangCollector {
findings: Vec::new(),
source: source_text,
};
collector.visit_program(program);
collector.findings
}
}
struct HtmlLangCollector<'a> {
findings: Vec<RuleFinding>,
source: &'a str,
}
impl<'a> Visit<'a> for HtmlLangCollector<'a> {
fn visit_jsx_opening_element(&mut self, el: &oxc_ast::ast::JSXOpeningElement<'a>) {
let is_html = matches!(&el.name, oxc_ast::ast::JSXElementName::Identifier(id) if id.name.as_str() == "html");
if !is_html {
return;
}
let has_lang = el.attributes.iter().any(|attr| {
if let oxc_ast::ast::JSXAttributeItem::Attribute(a) = attr {
matches!(&a.name, oxc_ast::ast::JSXAttributeName::Identifier(id) if id.name.as_str() == "lang")
} else {
false
}
});
if !has_lang {
let start = el.span.start as usize;
let line = self.source[..start].lines().count().max(1);
let col = start - self.source[..start].rfind('\n').map(|i| i + 1).unwrap_or(0);
self.findings.push(RuleFinding {
line,
column: col + 1,
message: "<html> element is missing the lang attribute".to_string(),
});
}
}
}