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use hir::db::AstDatabase;
use ide_db::source_change::SourceChange;
use syntax::{ast, AstNode};
use text_edit::TextEdit;
use crate::{
diagnostics::{fix, Diagnostic, DiagnosticsContext},
Assist,
};
// Diagnostic: remove-this-semicolon
//
// This diagnostic is triggered when there's an erroneous `;` at the end of the block.
pub(super) fn remove_this_semicolon(
ctx: &DiagnosticsContext<'_>,
d: &hir::RemoveThisSemicolon,
) -> Diagnostic {
Diagnostic::new(
"remove-this-semicolon",
"remove this semicolon",
ctx.sema.diagnostics_display_range(d.expr.clone().map(|it| it.into())).range,
)
.with_fixes(fixes(ctx, d))
}
fn fixes(ctx: &DiagnosticsContext<'_>, d: &hir::RemoveThisSemicolon) -> Option<Vec<Assist>> {
let root = ctx.sema.db.parse_or_expand(d.expr.file_id)?;
let semicolon = d
.expr
.value
.to_node(&root)
.syntax()
.parent()
.and_then(ast::ExprStmt::cast)
.and_then(|expr| expr.semicolon_token())?
.text_range();
let edit = TextEdit::delete(semicolon);
let source_change =
SourceChange::from_text_edit(d.expr.file_id.original_file(ctx.sema.db), edit);
Some(vec![fix("remove_semicolon", "Remove this semicolon", source_change, semicolon)])
}
#[cfg(test)]
mod tests {
use crate::diagnostics::tests::{check_diagnostics, check_fix};
#[test]
fn missing_semicolon() {
check_diagnostics(
r#"
fn test() -> i32 { 123; }
//^^^ remove this semicolon
"#,
);
}
#[test]
fn remove_semicolon() {
check_fix(r#"fn f() -> i32 { 92$0; }"#, r#"fn f() -> i32 { 92 }"#);
}
}
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