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use base_db::Document;
use rowan::{ast::AstNode, TextRange, TextSize};
use syntax::latex;
#[derive(Debug)]
pub struct ChangeEnvironmentResult<'a> {
pub begin: TextRange,
pub end: TextRange,
pub old_name: String,
pub new_name: &'a str,
}
pub fn change_environment<'a>(
document: &'a Document,
position: TextSize,
new_name: &'a str,
) -> Option<ChangeEnvironmentResult<'a>> {
let root = document.data.as_tex()?.root_node();
let environment = root
.token_at_offset(position)
.right_biased()?
.parent_ancestors()
.find_map(latex::Environment::cast)?;
let begin = environment.begin()?.name()?.key()?;
let end = environment.end()?.name()?.key()?;
let old_name = begin.to_string();
if old_name != end.to_string() {
return None;
}
Some(ChangeEnvironmentResult {
begin: latex::small_range(&begin),
end: latex::small_range(&end),
old_name,
new_name,
})
}
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